backend/src/main/java/core/api/controller/TaskController.java

@@ -13,6 +13,7 @@ import org.springframework.web.bind.annotation.*;
 import javax.validation.Valid;
 import java.time.LocalDate;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
 
 @CrossOrigin(origins = "*", maxAge = 3600)
@@ -72,7 +73,11 @@ public class TaskController {
             return ResponseEntity.status(404).body(new SimpleStatusResponse("failed"));
         }
 
-        return ResponseEntity.ok(taskgroupPermissionResult.getResult().getTasks().stream().map(TaskEntityInfo::new));
+        List<Task> tasks = new ArrayList<>();
+        for(Task task : taskgroupPermissionResult.getResult().getTasks()) {
+            if(task.getParent() == null) tasks.add(task);
+        }
+        return ResponseEntity.ok(tasks.stream().map(TaskEntityInfo::new));
     }
 
     @PutMapping("/tasks/{taskgroupID}")
@@ -164,4 +169,42 @@ public class TaskController {
         taskService.finishTask(taskPermissionResult.getResult());
         return ResponseEntity.ok(new SimpleStatusResponse("success"));
     }
+
+    @PutMapping("/tasks/{taskID}/subtasks")
+    public ResponseEntity<?> onCreateSubTask(@PathVariable long taskID, @Valid @RequestBody TaskFieldInfo taskFieldInfo) {
+        var taskPermissionResult = taskService.getTaskPermissions(taskID, SecurityContextHolder.getContext().getAuthentication().getName());
+        if(taskPermissionResult.hasIssue()) {
+            return taskPermissionResult.mapToResponseEntity();
+        }
+
+        var serviceResult = taskService.createSubTask(taskPermissionResult.getResult(), taskFieldInfo);
+        if(serviceResult.hasIssue()) {
+            return serviceResult.mapToResponseEntity();
+        } else {
+            return ResponseEntity.ok(new TaskEntityInfo(serviceResult.getResult()));
+        }
+
+    }
+
+    @GetMapping("/tasks/{taskID}/subtasks")
+    public ResponseEntity<?> onListSubtasks(@PathVariable long taskID) {
+        var taskPermissionResult = taskService.getTaskPermissions(taskID, SecurityContextHolder.getContext().getAuthentication().getName());
+        if(taskPermissionResult.hasIssue()) {
+            return taskPermissionResult.mapToResponseEntity();
+        }
+
+        Collection<Task> subtasks = taskPermissionResult.getResult().getSubtasks();
+        return ResponseEntity.ok(subtasks.stream().map(TaskEntityInfo::new).toList());
+    }
+
+    @DeleteMapping("/tasks/{taskID}/subtasks")
+    public ResponseEntity<?> onClearSubtasks(@PathVariable long taskID) {
+        var taskPermissionResult = taskService.getTaskPermissions(taskID, SecurityContextHolder.getContext().getAuthentication().getName());
+        if(taskPermissionResult.hasIssue()) {
+            return taskPermissionResult.mapToResponseEntity();
+        }
+
+        ServiceExitCode result = taskService.clearSubTasks(taskPermissionResult.getResult());
+        return result.mapToResponseEntity();
+    }
 }

backend/src/main/java/core/api/models/timemanager/taskgroup/RecursiveTaskgroupInfo.java

@@ -31,10 +31,13 @@ public class RecursiveTaskgroupInfo {
         }
 
         for(Task task : taskgroup.getActiveTasks()) {
-            this.activeTasks.add(new TaskOverviewInfo(task));
+            if(task.getParent() == null) {
-            if(task.getDeadline() != null && task.getDeadline().isBefore(LocalDate.now())) {
+                this.activeTasks.add(new TaskOverviewInfo(task));
-                this.hasOverdueTask = true;
+                if(task.getDeadline() != null && task.getDeadline().isBefore(LocalDate.now())) {
+                    this.hasOverdueTask = true;
+                }
             }
+
         }
         this.amountActiveTasks = taskgroup.getAmountOfActiveTasks();
     }

backend/src/main/java/core/api/models/timemanager/tasks/TaskEntityInfo.java

@@ -29,6 +29,8 @@ public class TaskEntityInfo {
 
     private boolean hasPlannedSchedules;
     private boolean hasTaskSerie;
+    private boolean hasSubtasks;
+    private boolean hasParent;
 
     public TaskEntityInfo(Task task) {
         this.taskID = task.getTaskID();
@@ -49,6 +51,8 @@ public class TaskEntityInfo {
         this.hasActiveSchedules = task.hasActiveSchedule();
         this.hasPlannedSchedules = task.hasPlannedSchedules();
         this.hasTaskSerie = task.getTaskSerieItem() != null;
+        this.hasSubtasks = task.getSubtasks() != null && !task.getSubtasks().isEmpty();
+        this.hasParent = task.getParent() != null;
     }
 
     public long getTaskID() {
@@ -146,4 +150,20 @@ public class TaskEntityInfo {
     public void setHasTaskSerie(boolean hasTaskSerie) {
         this.hasTaskSerie = hasTaskSerie;
     }
+
+    public boolean isHasSubtasks() {
+        return hasSubtasks;
+    }
+
+    public void setHasSubtasks(boolean hasSubtasks) {
+        this.hasSubtasks = hasSubtasks;
+    }
+
+    public boolean isHasParent() {
+        return hasParent;
+    }
+
+    public void setHasParent(boolean hasParent) {
+        this.hasParent = hasParent;
+    }
 }

backend/src/main/java/core/api/models/timemanager/tasks/TaskOverviewInfo.java

@@ -18,6 +18,7 @@ public class TaskOverviewInfo {
     private boolean overdue;
 
     private boolean finishable;
+    private boolean hasSubtasks;
 
     public TaskOverviewInfo(Task task) {
         this.taskID = task.getTaskID();
@@ -33,6 +34,7 @@ public class TaskOverviewInfo {
             this.overdue = LocalDate.now().isAfter(task.getDeadline());
         }
         this.finishable = task.isFinishable();
+        this.hasSubtasks = !task.getSubtasks().isEmpty();
     }
 
     public long getTaskID() {
@@ -90,4 +92,12 @@ public class TaskOverviewInfo {
     public void setFinishable(boolean finishable) {
         this.finishable = finishable;
     }
+
+    public boolean isHasSubtasks() {
+        return hasSubtasks;
+    }
+
+    public void setHasSubtasks(boolean hasSubtasks) {
+        this.hasSubtasks = hasSubtasks;
+    }
 }

backend/src/main/java/core/api/models/timemanager/tasks/repeatinginfo/TaskRepeatDayInfo.java

@@ -7,7 +7,6 @@ import java.time.LocalDate;
 public class TaskRepeatDayInfo {
 
     private int offset;
-    private DeadlineStrategy deadlineStrategy;
 
     @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX")
     private LocalDate endingDate;
@@ -20,14 +19,6 @@ public class TaskRepeatDayInfo {
         this.offset = offset;
     }
 
-    public DeadlineStrategy getDeadlineStrategy() {
-        return deadlineStrategy;
-    }
-
-    public void setDeadlineStrategy(DeadlineStrategy deadlineStrategy) {
-        this.deadlineStrategy = deadlineStrategy;
-    }
-
     public LocalDate getEndingDate() {
         return endingDate;
     }

backend/src/main/java/core/api/models/timemanager/tasks/repeatinginfo/TaskRepeatWeekDayInfo.java

@@ -8,6 +8,7 @@ import java.time.DayOfWeek;
 public class TaskRepeatWeekDayInfo {
     private int offset;
     private long taskID;
+    private DayOfWeek dayOfWeek;
 
     public int getOffset() {
         return offset;
@@ -24,4 +25,12 @@ public class TaskRepeatWeekDayInfo {
     public void setTaskID(long taskID) {
         this.taskID = taskID;
     }
+
+    public DayOfWeek getDayOfWeek() {
+        return dayOfWeek;
+    }
+
+    public void setDayOfWeek(DayOfWeek dayOfWeek) {
+        this.dayOfWeek = dayOfWeek;
+    }
 }

backend/src/main/java/core/api/models/timemanager/tasks/repeatinginfo/TaskRepeatWeekInfo.java

@@ -2,16 +2,19 @@ package core.api.models.timemanager.tasks.repeatinginfo;
 
 import com.fasterxml.jackson.annotation.JsonFormat;
 import org.hibernate.validator.constraints.Length;
+import util.Tupel;
 
 import javax.validation.constraints.Size;
+import java.time.DayOfWeek;
 import java.time.LocalDate;
+import java.util.Comparator;
+import java.util.HashMap;
 import java.util.List;
 
 public class TaskRepeatWeekInfo {
 
     @Size(min = 1, max = 7)
     private List<TaskRepeatWeekDayInfo> weekDayInfos;
-    private DeadlineStrategy deadlineStrategy;
     @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX")
     private LocalDate endDate;
 
@@ -22,15 +25,6 @@ public class TaskRepeatWeekInfo {
     public void setWeekDayInfos(List<TaskRepeatWeekDayInfo> weekDayInfos) {
         this.weekDayInfos = weekDayInfos;
     }
-
-    public DeadlineStrategy getDeadlineStrategy() {
-        return deadlineStrategy;
-    }
-
-    public void setDeadlineStrategy(DeadlineStrategy deadlineStrategy) {
-        this.deadlineStrategy = deadlineStrategy;
-    }
-
     public LocalDate getEndDate() {
         return endDate;
     }

backend/src/main/java/core/entities/timemanager/Task.java

@@ -1,14 +1,15 @@
 package core.entities.timemanager;
 
 import core.api.models.timemanager.tasks.TaskFieldInfo;
+import core.api.models.timemanager.tasks.repeatinginfo.DeadlineStrategy;
+import util.Tripel;
+import util.Tupel;
 
 import javax.persistence.*;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
-import java.util.ArrayList;
+import java.time.temporal.ChronoUnit;
-import java.util.List;
+import java.util.*;
-import java.util.Objects;
-import java.util.Set;
 
 @Entity
 @Table(name = "tasks")
@@ -33,6 +34,13 @@ public class Task {
     @OneToOne(mappedBy = "task", cascade = CascadeType.ALL, orphanRemoval = true)
     private TaskSerieItem taskSerieItem;
 
+    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
+    private Set<Task> subtasks;
+
+    @ManyToOne
+    @JoinColumn(name = "parent")
+    private Task parent;
+
     public Task() {
         this.basicTaskSchedules = new ArrayList<>();
     }
@@ -47,14 +55,52 @@ public class Task {
         this.finishable = taskFieldInfo.isFinishable();
     }
 
-    public static Task cloneTask(Task task) {
+    public Tripel<Task, Collection<Task>, Collection<AbstractSchedule>> cloneTask() {
+       Collection<Task> clonedTasks = new ArrayList<>();
+       Collection<AbstractSchedule> clonedSchedules = new ArrayList<>();
+
        Task clonedTask = new Task();
-       clonedTask.setTaskgroup(task.getTaskgroup());
+       clonedTasks.add(clonedTask);
-       clonedTask.setTaskName(task.taskName);
+
-       clonedTask.setEta(task.eta);
+       clonedTask.setTaskgroup(this.getTaskgroup());
-       clonedTask.setFinished(false);
+       clonedTask.setTaskName(this.taskName);
-       clonedTask.setFinishable(task.finishable);
+       clonedTask.setEta(this.eta);
-       return clonedTask;
+       clonedTask.setFinished(this.finished);
+       clonedTask.setFinishable(this.finishable);
+       clonedTask.setStartDate(this.startDate);
+       clonedTask.setDeadline(this.deadline);
+
+       for(AbstractSchedule abstractSchedule : this.basicTaskSchedules) {
+           AbstractSchedule clonedSchedule = abstractSchedule.cloneSchedule();
+           clonedSchedules.add(clonedSchedule);
+           clonedTask.getBasicTaskSchedules().clear();
+           clonedTask.getBasicTaskSchedules().add(clonedSchedule);
+       }
+
+       Set<Task> clonedSubtasks = new HashSet<>();
+       for(Task task : this.subtasks) {
+           Tripel<Task, Collection<Task>, Collection<AbstractSchedule>> clonedSubtask = task.cloneTask();
+           clonedSubtask.getValue00().setParent(clonedTask);
+           clonedSubtasks.add(clonedSubtask.getValue00());
+
+           clonedTasks.addAll(clonedSubtask.getValue01());
+           clonedSchedules.addAll(clonedSubtask.getValue02());
+       }
+       clonedTask.setSubtasks(clonedSubtasks);
+       return new Tripel<>(clonedTask, clonedTasks, clonedSchedules);
+    }
+
+    public void shiftTask(long offset) {
+       this.setStartDate(this.getStartDate().plusDays(offset));
+       this.setDeadline(this.getDeadline().plusDays(offset));
+
+       for(AbstractSchedule abstractSchedule : this.basicTaskSchedules) {
+           abstractSchedule.shiftSchedule(offset);
+       }
+
+       for(Task subtask: this.subtasks) {
+           subtask.shiftTask(offset);
+       }
     }
 
 
@@ -149,6 +195,27 @@ public class Task {
         this.basicTaskSchedules = basicTaskSchedules;
     }
 
+    public void addSubtask(Task subtask) {
+        subtask.setParent(this);
+        this.subtasks.add(subtask);
+    }
+
+    public Set<Task> getSubtasks() {
+        return subtasks;
+    }
+
+    public void setSubtasks(Set<Task> subtasks) {
+        this.subtasks = subtasks;
+    }
+
+    public Task getParent() {
+        return parent;
+    }
+
+    public void setParent(Task parent) {
+        this.parent = parent;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;

backend/src/main/java/core/entities/timemanager/TaskSerie.java

@@ -39,4 +39,9 @@ public class TaskSerie {
         this.tasks.add(taskSerieItem);
         return taskSerieItem;
     }
+
+    public void addItem(TaskSerieItem taskSerieItem) {
+        this.tasks.add(taskSerieItem);
+        taskSerieItem.setTaskSerie(this);
+    }
 }

backend/src/main/java/core/entities/timemanager/TaskSerieItem.java

@@ -31,6 +31,12 @@ public class TaskSerieItem {
     public TaskSerieItem() {
     }
 
+    public TaskSerieItem(Task task, int itemIndex) {
+        this.taskSerie = null;
+        this.seriesIndex = itemIndex;
+        this.task = task;
+    }
+
     public long getItemID() {
         return itemID;
     }

backend/src/main/java/core/repositories/timemanager/ScheduleRepository.java

@@ -2,10 +2,12 @@ package core.repositories.timemanager;
 
 import core.entities.timemanager.AbstractSchedule;
 import core.entities.timemanager.Taskgroup;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.stereotype.Repository;
 
+import javax.transaction.Transactional;
 import java.time.LocalDate;
 import java.util.Collection;
 import java.util.List;
@@ -20,4 +22,9 @@ public interface ScheduleRepository extends CrudRepository<AbstractSchedule, Lon
     @Query(value = "SELECT s FROM AbstractSchedule s WHERE s.task.taskgroup.user.username = ?1 AND s.startTime is NOT NULL and s.stopTime is NULL")
     Optional<AbstractSchedule> getActiveScheduleOfUser(String username);
 
+
+    @Modifying
+    @Transactional
+    @Query(value = "DELETE FROM AbstractSchedule a WHERE a.task IN (SELECT t FROM Task t WHERE t.taskgroup = ?1)")
+    void deleteByTaskgroup(Taskgroup taskgroup);
 }

backend/src/main/java/core/repositories/timemanager/TaskRepository.java

@@ -25,6 +25,7 @@ public interface TaskRepository extends CrudRepository<Task, Long> {
 
     @Transactional
     @Modifying
+    @Query(value = "DELETE FROM Task t WHERE t.taskID = ?1")
     void deleteByTaskID(long taskID);
 
     @Query(value = "SELECT t FROM Task t WHERE t.taskgroup.user.username = ?1 AND t.deadline is NOT NULL AND t.deadline < ?2 AND t.finished = FALSE")
@@ -35,4 +36,17 @@ public interface TaskRepository extends CrudRepository<Task, Long> {
 
     @Query(value = "SELECT t FROM Task t WHERE t.taskgroup.user.username = ?1 AND (t.startDate IS NULL OR t.startDate <= ?2) AND t.finished = FALSE")
     List<Task> findAllActive(String username, LocalDate now);
+
+    @Query(value = "SELECT t FROM Task t WHERE t.taskgroup = ?1")
+    List<Task> findAllByTaskgroup(Taskgroup taskgroup);
+
+    @Modifying
+    @Transactional
+    @Query(value = "UPDATE Task t SET t.parent = null WHERE t.taskgroup = ?1")
+    void deleteTaskHierarchyWhereTaskgroup(Taskgroup taskgroup);
+
+    @Modifying
+    @Transactional
+    @Query(value = "DELETE Task t WHERE t.parent = ?1")
+    void deleteTasksByParent(Task parentTask);
 }

backend/src/main/java/core/services/TaskScheduleService.java

@@ -7,10 +7,7 @@ import core.api.models.timemanager.taskSchedule.scheduleInfos.AdvancedScheduleIn
 import core.api.models.timemanager.taskSchedule.scheduleInfos.BasicScheduleFieldInfo;
 import core.api.models.timemanager.taskSchedule.ForgottenScheduleInfo;
 import core.api.models.timemanager.taskSchedule.scheduleInfos.ScheduleInfo;
-import core.entities.timemanager.AbstractSchedule;
+import core.entities.timemanager.*;
-import core.entities.timemanager.AdvancedTaskSchedule;
-import core.entities.timemanager.BasicTaskSchedule;
-import core.entities.timemanager.Task;
 import core.repositories.UserRepository;
 import core.repositories.timemanager.AdvancedScheduleRepository;
 import core.repositories.timemanager.ScheduleRepository;
@@ -259,4 +256,8 @@ public class TaskScheduleService {
         schedule.setStopTime(schedule.getStartTime().plusMinutes(manualScheduleStopInfo.getDuration()));
         scheduleRepository.save(schedule);
     }
+
+    public void deleteSchedulesByTaskgroup(Taskgroup taskgroup) {
+        scheduleRepository.deleteByTaskgroup(taskgroup);
+    }
 }

backend/src/main/java/core/services/TaskSeriesService.java

@@ -11,14 +11,13 @@ import core.repositories.timemanager.TaskSerieItemRepository;
 import core.repositories.timemanager.TaskSeriesRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+import util.Tupel;
 
+import java.time.DayOfWeek;
 import java.time.Duration;
 import java.time.LocalDate;
 import java.time.temporal.ChronoUnit;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Comparator;
-import java.util.List;
-import java.util.Optional;
 
 @Service
 public class TaskSeriesService {
@@ -30,106 +29,103 @@ public class TaskSeriesService {
 
 
     public ServiceExitCode createTaskSeries(TaskRepeatWeekInfo taskRepeatInfo) {
-        List<Task> createdTasks = new ArrayList<>();
+        HashMap<Task, Integer> offsetMap = calcWeeklyOffsetMap(taskRepeatInfo);
+
         TaskSerie taskSerie = new TaskSerie();
-        List<AbstractSchedule> abstractSchedules = new ArrayList<>();
+        List<Task> clonedTasks = new ArrayList<>();
+        List<AbstractSchedule> clonedSchedules = new ArrayList<>();
+        int weekDayIndex = 0;
+        for(Map.Entry<Task, Integer> repeatingTaskInfo: offsetMap.entrySet()) {
+            Task rootTask = repeatingTaskInfo.getKey();
+            addRootSubTasksToTaskSerie(taskSerie, rootTask, weekDayIndex);
 
-        for(TaskRepeatWeekDayInfo taskRepeatDayInfo : taskRepeatInfo.getWeekDayInfos()) {
+            int itemIndex = weekDayIndex +1;
-            Optional<Task> task = taskRepository.findById(taskRepeatDayInfo.getTaskID());
+            Tupel<Collection<Task>, Collection<AbstractSchedule>> repeatingResult = repeatTask(rootTask, taskRepeatInfo.getEndDate(), offsetMap, taskSerie, itemIndex);
-            if(task.isEmpty()) return ServiceExitCode.MISSING_ENTITY;
 
-            TaskSerieItem rootItem = taskSerie.addTask(task.get());
+            clonedTasks.addAll(repeatingResult.getValue00());
-            task.get().setTaskSerieItem(rootItem);
+            clonedSchedules.addAll(repeatingResult.getValue01());
 
-            LocalDate currentTaskDate = task.get().getStartDate().plusDays(taskRepeatDayInfo.getOffset());
+            weekDayIndex++;
-            while(currentTaskDate.isBefore(taskRepeatInfo.getEndDate())) {
-                Task clonedTask = Task.cloneTask(task.get());
-                clonedTask.setStartDate(currentTaskDate);
-
-                TaskSerieItem taskSerieItem = taskSerie.addTask(clonedTask);
-                clonedTask.setTaskSerieItem(taskSerieItem);
-                createdTasks.add(clonedTask);
-
-                abstractSchedules.addAll(cloneSchedules(task.get(), clonedTask));
-                currentTaskDate = currentTaskDate.plusDays(taskRepeatDayInfo.getOffset());
-            }
         }
 
-        taskSerie.getTasks().sort(Comparator.comparing(o -> o.getTask().getStartDate()));
-        for(int i=0; i<taskSerie.getTasks().size(); i++) {
-            taskSerie.getTasks().get(i).setSeriesIndex(i+1);
-            if(taskRepeatInfo.getDeadlineStrategy() == DeadlineStrategy.DEADLINE_EQUAL_START) {
-                taskSerie.getTasks().get(i).getTask().setDeadline(taskSerie.getTasks().get(i).getTask().getStartDate());
-            } else {
-                if(i + 1 == taskSerie.getTasks().size()) {
-                    int firstWeekDayIndex = i % taskRepeatInfo.getWeekDayInfos().size();
-                    LocalDate reference_start = taskSerie.getTasks().get(firstWeekDayIndex).getTask().getStartDate();
-                    LocalDate reference_deadline = taskSerie.getTasks().get(firstWeekDayIndex).getTask().getDeadline();
-
-                    Duration duration = Duration.between(reference_start, reference_deadline);
-                    long days = duration.toDays();
-                    taskSerie.getTasks().get(i).getTask().setDeadline(taskSerie.getTasks().get(i).getTask().getStartDate().plusDays(days));
-                } else {
-                    taskSerie.getTasks().get(i).getTask().setDeadline(taskSerie.getTasks().get(i+1).getTask().getStartDate().minusDays(1));
-                }
-            }
-        }
 
         taskSeriesRepository.save(taskSerie);
-        taskRepository.saveAll(createdTasks);
+        taskRepository.saveAll(clonedTasks);
         taskSerieItemRepository.saveAll(taskSerie.getTasks());
-        scheduleRepository.saveAll(abstractSchedules);
+        scheduleRepository.saveAll(clonedSchedules);
 
         return ServiceExitCode.OK;
     }
 
+    private Tupel<Collection<Task>, Collection<AbstractSchedule>> repeatTask(Task rootTask, LocalDate endingDate, HashMap<Task, Integer> offsetMap,TaskSerie taskSerie, int itemIndex) {
+        List<Task> clonedTasks = new ArrayList<>();
+        List<AbstractSchedule> clonedSchedules = new ArrayList<>();
+
+        LocalDate currentDate = rootTask.getStartDate().plusDays(offsetMap.get(rootTask));
+        while(currentDate.isBefore(endingDate)) {
+            var cloneResult = rootTask.cloneTask();
+            Task clonedRootTask = cloneResult.getValue00();
+            clonedTasks.addAll(cloneResult.getValue01());
+            clonedSchedules.addAll(cloneResult.getValue02());
+
+            for(Task clonedTask : cloneResult.getValue01()) {
+                TaskSerieItem item = new TaskSerieItem(clonedTask, itemIndex);
+                taskSerie.addItem(item);
+            }
+
+            clonedRootTask.shiftTask(offsetMap.get(rootTask));
+
+            currentDate = currentDate.plusDays(offsetMap.get(rootTask));
+            itemIndex += offsetMap.size();
+        }
+
+        return new Tupel<>(clonedTasks, clonedSchedules);
+    }
+
+    private HashMap<Task, Integer> calcWeeklyOffsetMap(TaskRepeatWeekInfo weekInfo) throws NoSuchElementException {
+        HashMap<Task,Integer> offsetMap = new HashMap<>();
+        weekInfo.getWeekDayInfos().sort(Comparator.comparing(TaskRepeatWeekDayInfo::getDayOfWeek));
+        for(int i=0; i<weekInfo.getWeekDayInfos().size(); i++) {
+            Optional<Task> requestedTask = taskRepository.findById(weekInfo.getWeekDayInfos().get(i).getTaskID());
+            if(requestedTask.isEmpty()) {
+                throw new NoSuchElementException();
+            } else {
+                int offset = weekInfo.getWeekDayInfos().get(i).getOffset()-1;
+                offsetMap.put(requestedTask.get(), offset);
+            }
+
+        }
+        return offsetMap;
+    }
+
     public ServiceExitCode createTaskSeries(Task rootTask, TaskRepeatDayInfo taskRepeatInfo) {
-        if(taskRepeatInfo.getDeadlineStrategy() == DeadlineStrategy.FIX_DEADLINE) {
-            return ServiceExitCode.INVALID_PARAMETER;
-        }
-
-        List<Task> taskList = new ArrayList<>();
-        List<AbstractSchedule> abstractSchedules = new ArrayList<>();
         TaskSerie taskSerie = new TaskSerie();
-        TaskSerieItem rootItem = taskSerie.addTask(rootTask);
+        addRootSubTasksToTaskSerie(taskSerie, rootTask, 0);
-        rootTask.setTaskSerieItem(rootItem);
 
-        LocalDate currentTaskDate = rootTask.getStartDate().plusDays(taskRepeatInfo.getOffset());
+        HashMap<Task, Integer> offsetMap = new HashMap<>();
-        while(currentTaskDate.isBefore(taskRepeatInfo.getEndingDate())) {
+        offsetMap.put(rootTask, taskRepeatInfo.getOffset());
-            Task task = Task.cloneTask(rootTask);
+
-            task.setStartDate(currentTaskDate);
+        var repeatingResult = repeatTask(rootTask, taskRepeatInfo.getEndingDate(), offsetMap, taskSerie, 0);
-            if(taskRepeatInfo.getDeadlineStrategy() == DeadlineStrategy.DEADLINE_EQUAL_START) {
+        List<Task> clonedTasks = new ArrayList<>(repeatingResult.getValue00());
-                task.setDeadline(currentTaskDate);
+        List<AbstractSchedule> clonedSchedules = new ArrayList<>(repeatingResult.getValue01());
-            } else if(taskRepeatInfo.getDeadlineStrategy() == DeadlineStrategy.DEADLINE_FIT_START) {
-                task.setDeadline(currentTaskDate.plusDays(taskRepeatInfo.getOffset()-1));
-            }
-            TaskSerieItem taskSerieItem = taskSerie.addTask(task);
-            taskList.add(task);
-            task.setTaskSerieItem(taskSerieItem);
 
-            abstractSchedules.addAll(cloneSchedules(rootTask, task));
-            currentTaskDate = currentTaskDate.plusDays(taskRepeatInfo.getOffset());
-        }
 
         taskSeriesRepository.save(taskSerie);
-        taskRepository.saveAll(taskList);
+        taskRepository.saveAll(clonedTasks);
         taskSerieItemRepository.saveAll(taskSerie.getTasks());
-        scheduleRepository.saveAll(abstractSchedules);
+        scheduleRepository.saveAll(clonedSchedules);
 
         return ServiceExitCode.OK;
     }
 
-    public List<AbstractSchedule> cloneSchedules(Task previousTask, Task nextTask) {
+    private void addRootSubTasksToTaskSerie(TaskSerie taskSerie, Task rootTask, int index) {
-        long numberDays = ChronoUnit.DAYS.between(previousTask.getStartDate(), nextTask.getStartDate());
+        Queue<Task> taskQueue = new LinkedList<>(Collections.singletonList(rootTask));
+        while(!taskQueue.isEmpty()) {
+            Task currentTask = taskQueue.poll();
 
-        List<AbstractSchedule> clonedSchedules = new ArrayList<>();
+            TaskSerieItem taskSerieItem = new TaskSerieItem(currentTask, index);
-        for(AbstractSchedule abstractSchedule : previousTask.getBasicTaskSchedules()) {
+            taskSerie.addItem(taskSerieItem);
-            AbstractSchedule clonedSchedule = abstractSchedule.cloneSchedule();
-            clonedSchedule.shiftSchedule(numberDays);
-
-            clonedSchedules.add(clonedSchedule);
         }
-        return clonedSchedules;
     }
 
     public void deleteTaskSeriesItem(Task task) {
@@ -144,22 +140,20 @@ public class TaskSeriesService {
             }
             taskSerie.getTasks().clear();
             taskSeriesRepository.delete(taskSerie);
-        } else {
+        } else if(task.getParent() == null){
-            repearIndexing(taskSerie);
+            repearIndexing(taskSerie, item.getSeriesIndex());
         }
     }
 
-    private void repearIndexing(TaskSerie taskSerie) {
+    private void repearIndexing(TaskSerie taskSerie, int deletedIndex) {
         taskSerie.getTasks().sort(Comparator.comparingInt(TaskSerieItem::getSeriesIndex));
         List<TaskSerieItem> updatedItems = new ArrayList<>();
-        int currentIndex = 1;
+
         for(TaskSerieItem taskSerieItem : taskSerie.getTasks()) {
-            if(taskSerieItem.getSeriesIndex() != currentIndex) {
+            if(taskSerieItem.getSeriesIndex() > deletedIndex) {
-                taskSerieItem.setSeriesIndex(currentIndex);
+                taskSerieItem.setSeriesIndex(taskSerieItem.getSeriesIndex() -1);
                 updatedItems.add(taskSerieItem);
             }
-
-            currentIndex++;
         }
 
         taskSerieItemRepository.saveAll(updatedItems);

backend/src/main/java/core/services/TaskService.java

@@ -49,6 +49,21 @@ public class TaskService {
         return new ServiceResult<>(task);
     }
 
+    public ServiceResult<Task> createSubTask(Task parentTask, TaskFieldInfo taskFieldInfo) {
+        if(taskFieldInfo.getStartDate().isBefore(parentTask.getStartDate()) ||
+                taskFieldInfo.getDeadline().isAfter(parentTask.getDeadline()) ||
+                taskFieldInfo.getDeadline().isBefore(taskFieldInfo.getStartDate())) {
+            return new ServiceResult<>(ServiceExitCode.INVALID_PARAMETER);
+        }
+
+        Task task = new Task(parentTask.getTaskgroup(), taskFieldInfo);
+        parentTask.getTaskgroup().getTasks().add(task);
+        parentTask.addSubtask(task);
+
+        taskRepository.save(task);
+        return new ServiceResult<>(task);
+    }
+
     private boolean existTaskByName(Collection<Task> tasks, String name) {
         for(Task task : tasks) {
             if(task.getTaskName().equals(name)) {
@@ -94,11 +109,12 @@ public class TaskService {
             taskSeriesService.deleteTaskSeriesItem(task);
         }
         taskRepository.delete(task);
-
     }
 
     public void clearTasks(Taskgroup taskgroup) {
         taskSeriesService.deleteTaskSerieByTaskgroup(taskgroup);
+        taskScheduleService.deleteSchedulesByTaskgroup(taskgroup);
+        taskRepository.deleteTaskHierarchyWhereTaskgroup(taskgroup);
         taskRepository.deleteAllByTaskgroup(taskgroup);
     }
 
@@ -143,4 +159,9 @@ public class TaskService {
         }
 
     }
+
+    public ServiceExitCode clearSubTasks(Task parentTask) {
+        taskRepository.deleteTasksByParent(parentTask);
+        return ServiceExitCode.OK;
+    }
 }

backend/src/main/java/core/services/TaskgroupService.java

@@ -21,10 +21,12 @@ public class TaskgroupService {
 
     private final TaskgroupRepository taskgroupRepository;
     private final UserRepository userRepository;
+    private final TaskService taskService;
     public TaskgroupService(@Autowired  TaskgroupRepository taskgroupRepository,
-                            @Autowired UserRepository userRepository) {
+                            @Autowired UserRepository userRepository, @Autowired TaskService taskService) {
         this.taskgroupRepository = taskgroupRepository;
         this.userRepository = userRepository;
+        this.taskService = taskService;
     }
 
     public PermissionResult<Taskgroup> getTaskgroupByIDAndUsername(long taskgroupID, String username) {
@@ -97,6 +99,7 @@ public class TaskgroupService {
     }
 
     public void deleteTaskgroup(Taskgroup taskgroup) {
+        taskService.clearTasks(taskgroup);
         taskgroupRepository.delete(taskgroup);
     }
 

backend/src/main/java/util/Tripel.java

@@ -0,0 +1,15 @@
+package util;
+
+public class Tripel<A,B,C> extends Tupel<A, B> {
+
+    private final C value02;
+
+    public Tripel(A value00, B value01, C value02) {
+        super(value00, value01);
+        this.value02 = value02;
+    }
+
+    public C getValue02() {
+        return value02;
+    }
+}

backend/src/main/java/util/Tupel.java

@@ -0,0 +1,20 @@
+package util;
+
+public class Tupel <A, B>{
+
+    private final A value00;
+    private final B value01;
+
+    public Tupel(A value00, B value01) {
+        this.value00 = value00;
+        this.value01 = value01;
+    }
+
+    public A getValue00() {
+        return value00;
+    }
+
+    public B getValue01() {
+        return value01;
+    }
+}

frontend/src/api/api/task.service.ts

@@ -401,6 +401,190 @@ export class TaskService {
         );
     }
 
+    /**
+     * @param taskID internal id of task
+     * @param observe set whether or not to return the data Observable as the body, response or events. defaults to returning the body.
+     * @param reportProgress flag to report request and response progress.
+     */
+    public tasksTaskIDSubtasksDelete(taskID: number, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<SimpleStatusResponse>;
+    public tasksTaskIDSubtasksDelete(taskID: number, observe?: 'response', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpResponse<SimpleStatusResponse>>;
+    public tasksTaskIDSubtasksDelete(taskID: number, observe?: 'events', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpEvent<SimpleStatusResponse>>;
+    public tasksTaskIDSubtasksDelete(taskID: number, observe: any = 'body', reportProgress: boolean = false, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<any> {
+        if (taskID === null || taskID === undefined) {
+            throw new Error('Required parameter taskID was null or undefined when calling tasksTaskIDSubtasksDelete.');
+        }
+
+        let localVarHeaders = this.defaultHeaders;
+
+        let localVarCredential: string | undefined;
+        // authentication (API_TOKEN) required
+        localVarCredential = this.configuration.lookupCredential('API_TOKEN');
+        if (localVarCredential) {
+            localVarHeaders = localVarHeaders.set('Authorization', 'Bearer ' + localVarCredential);
+        }
+
+        let localVarHttpHeaderAcceptSelected: string | undefined = options && options.httpHeaderAccept;
+        if (localVarHttpHeaderAcceptSelected === undefined) {
+            // to determine the Accept header
+            const httpHeaderAccepts: string[] = [
+                'application/json'
+            ];
+            localVarHttpHeaderAcceptSelected = this.configuration.selectHeaderAccept(httpHeaderAccepts);
+        }
+        if (localVarHttpHeaderAcceptSelected !== undefined) {
+            localVarHeaders = localVarHeaders.set('Accept', localVarHttpHeaderAcceptSelected);
+        }
+
+        let localVarHttpContext: HttpContext | undefined = options && options.context;
+        if (localVarHttpContext === undefined) {
+            localVarHttpContext = new HttpContext();
+        }
+
+
+        let responseType_: 'text' | 'json' = 'json';
+        if(localVarHttpHeaderAcceptSelected && localVarHttpHeaderAcceptSelected.startsWith('text')) {
+            responseType_ = 'text';
+        }
+
+        return this.httpClient.delete<SimpleStatusResponse>(`${this.configuration.basePath}/tasks/${encodeURIComponent(String(taskID))}/subtasks`,
+            {
+                context: localVarHttpContext,
+                responseType: <any>responseType_,
+                withCredentials: this.configuration.withCredentials,
+                headers: localVarHeaders,
+                observe: observe,
+                reportProgress: reportProgress
+            }
+        );
+    }
+
+    /**
+     * @param taskID internal id of task
+     * @param observe set whether or not to return the data Observable as the body, response or events. defaults to returning the body.
+     * @param reportProgress flag to report request and response progress.
+     */
+    public tasksTaskIDSubtasksGet(taskID: number, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<Array<TaskEntityInfo>>;
+    public tasksTaskIDSubtasksGet(taskID: number, observe?: 'response', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpResponse<Array<TaskEntityInfo>>>;
+    public tasksTaskIDSubtasksGet(taskID: number, observe?: 'events', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpEvent<Array<TaskEntityInfo>>>;
+    public tasksTaskIDSubtasksGet(taskID: number, observe: any = 'body', reportProgress: boolean = false, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<any> {
+        if (taskID === null || taskID === undefined) {
+            throw new Error('Required parameter taskID was null or undefined when calling tasksTaskIDSubtasksGet.');
+        }
+
+        let localVarHeaders = this.defaultHeaders;
+
+        let localVarCredential: string | undefined;
+        // authentication (API_TOKEN) required
+        localVarCredential = this.configuration.lookupCredential('API_TOKEN');
+        if (localVarCredential) {
+            localVarHeaders = localVarHeaders.set('Authorization', 'Bearer ' + localVarCredential);
+        }
+
+        let localVarHttpHeaderAcceptSelected: string | undefined = options && options.httpHeaderAccept;
+        if (localVarHttpHeaderAcceptSelected === undefined) {
+            // to determine the Accept header
+            const httpHeaderAccepts: string[] = [
+                'application/json'
+            ];
+            localVarHttpHeaderAcceptSelected = this.configuration.selectHeaderAccept(httpHeaderAccepts);
+        }
+        if (localVarHttpHeaderAcceptSelected !== undefined) {
+            localVarHeaders = localVarHeaders.set('Accept', localVarHttpHeaderAcceptSelected);
+        }
+
+        let localVarHttpContext: HttpContext | undefined = options && options.context;
+        if (localVarHttpContext === undefined) {
+            localVarHttpContext = new HttpContext();
+        }
+
+
+        let responseType_: 'text' | 'json' = 'json';
+        if(localVarHttpHeaderAcceptSelected && localVarHttpHeaderAcceptSelected.startsWith('text')) {
+            responseType_ = 'text';
+        }
+
+        return this.httpClient.get<Array<TaskEntityInfo>>(`${this.configuration.basePath}/tasks/${encodeURIComponent(String(taskID))}/subtasks`,
+            {
+                context: localVarHttpContext,
+                responseType: <any>responseType_,
+                withCredentials: this.configuration.withCredentials,
+                headers: localVarHeaders,
+                observe: observe,
+                reportProgress: reportProgress
+            }
+        );
+    }
+
+    /**
+     * Creates Subtask
+     * Create Subtask
+     * @param taskID internal id of task
+     * @param taskFieldInfo 
+     * @param observe set whether or not to return the data Observable as the body, response or events. defaults to returning the body.
+     * @param reportProgress flag to report request and response progress.
+     */
+    public tasksTaskIDSubtasksPut(taskID: number, taskFieldInfo?: TaskFieldInfo, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<TaskEntityInfo>;
+    public tasksTaskIDSubtasksPut(taskID: number, taskFieldInfo?: TaskFieldInfo, observe?: 'response', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpResponse<TaskEntityInfo>>;
+    public tasksTaskIDSubtasksPut(taskID: number, taskFieldInfo?: TaskFieldInfo, observe?: 'events', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<HttpEvent<TaskEntityInfo>>;
+    public tasksTaskIDSubtasksPut(taskID: number, taskFieldInfo?: TaskFieldInfo, observe: any = 'body', reportProgress: boolean = false, options?: {httpHeaderAccept?: 'application/json', context?: HttpContext}): Observable<any> {
+        if (taskID === null || taskID === undefined) {
+            throw new Error('Required parameter taskID was null or undefined when calling tasksTaskIDSubtasksPut.');
+        }
+
+        let localVarHeaders = this.defaultHeaders;
+
+        let localVarCredential: string | undefined;
+        // authentication (API_TOKEN) required
+        localVarCredential = this.configuration.lookupCredential('API_TOKEN');
+        if (localVarCredential) {
+            localVarHeaders = localVarHeaders.set('Authorization', 'Bearer ' + localVarCredential);
+        }
+
+        let localVarHttpHeaderAcceptSelected: string | undefined = options && options.httpHeaderAccept;
+        if (localVarHttpHeaderAcceptSelected === undefined) {
+            // to determine the Accept header
+            const httpHeaderAccepts: string[] = [
+                'application/json'
+            ];
+            localVarHttpHeaderAcceptSelected = this.configuration.selectHeaderAccept(httpHeaderAccepts);
+        }
+        if (localVarHttpHeaderAcceptSelected !== undefined) {
+            localVarHeaders = localVarHeaders.set('Accept', localVarHttpHeaderAcceptSelected);
+        }
+
+        let localVarHttpContext: HttpContext | undefined = options && options.context;
+        if (localVarHttpContext === undefined) {
+            localVarHttpContext = new HttpContext();
+        }
+
+
+        // to determine the Content-Type header
+        const consumes: string[] = [
+            'application/json'
+        ];
+        const httpContentTypeSelected: string | undefined = this.configuration.selectHeaderContentType(consumes);
+        if (httpContentTypeSelected !== undefined) {
+            localVarHeaders = localVarHeaders.set('Content-Type', httpContentTypeSelected);
+        }
+
+        let responseType_: 'text' | 'json' = 'json';
+        if(localVarHttpHeaderAcceptSelected && localVarHttpHeaderAcceptSelected.startsWith('text')) {
+            responseType_ = 'text';
+        }
+
+        return this.httpClient.put<TaskEntityInfo>(`${this.configuration.basePath}/tasks/${encodeURIComponent(String(taskID))}/subtasks`,
+            taskFieldInfo,
+            {
+                context: localVarHttpContext,
+                responseType: <any>responseType_,
+                withCredentials: this.configuration.withCredentials,
+                headers: localVarHeaders,
+                observe: observe,
+                reportProgress: reportProgress
+            }
+        );
+    }
+
     /**
      * creates a new task
      * creates tasks

frontend/src/api/model/taskEntityInfo.ts

@@ -60,5 +60,13 @@ export interface TaskEntityInfo {
      * determines whether the task is associated with a taskserie
      */
     hasTaskSerie: boolean;
+    /**
+     * determines whether a task has subtasks
+     */
+    hasSubtasks: boolean;
+    /**
+     * determines whether a task is a top task or Not
+     */
+    hasParent: boolean;
 }
 

frontend/src/api/model/taskOverviewInfo.ts

@@ -42,5 +42,9 @@ export interface TaskOverviewInfo {
      * determines whether the task can be finished
      */
     finishable: boolean;
+    /**
+     * determines whether the task has subtasks
+     */
+    hasSubtasks: boolean;
 }
 

frontend/src/api/model/taskRepeatDayInfo.ts

@@ -16,18 +16,9 @@ export interface TaskRepeatDayInfo {
      * number repeating days
      */
     offset: number;
-    deadlineStrategy: TaskRepeatDayInfo.DeadlineStrategyEnum;
     /**
      * Date until the tasks repeat
      */
     endingDate: string;
 }
-export namespace TaskRepeatDayInfo {
-    export type DeadlineStrategyEnum = 'DEADLINE_EQUAL_START' | 'DEADLINE_FIT_START';
-    export const DeadlineStrategyEnum = {
-        EqualStart: 'DEADLINE_EQUAL_START' as DeadlineStrategyEnum,
-        FitStart: 'DEADLINE_FIT_START' as DeadlineStrategyEnum
-    };
-}
-
 

frontend/src/api/model/taskRepeatWeekDayInfo.ts

@@ -20,5 +20,22 @@ export interface TaskRepeatWeekDayInfo {
      * internal identifier of task
      */
     taskID: number;
+    /**
+     * day of week
+     */
+    dayOfWeek: TaskRepeatWeekDayInfo.DayOfWeekEnum;
+}
+export namespace TaskRepeatWeekDayInfo {
+    export type DayOfWeekEnum = 'MONDAY' | 'TUESDAY' | 'WEDNESDAY' | 'THURSDAY' | 'FRIDAY' | 'SATURDAY' | 'SUNDAY';
+    export const DayOfWeekEnum = {
+        Monday: 'MONDAY' as DayOfWeekEnum,
+        Tuesday: 'TUESDAY' as DayOfWeekEnum,
+        Wednesday: 'WEDNESDAY' as DayOfWeekEnum,
+        Thursday: 'THURSDAY' as DayOfWeekEnum,
+        Friday: 'FRIDAY' as DayOfWeekEnum,
+        Saturday: 'SATURDAY' as DayOfWeekEnum,
+        Sunday: 'SUNDAY' as DayOfWeekEnum
+    };
 }
 
+

frontend/src/api/model/taskRepeatWeekInfo.ts

@@ -13,19 +13,10 @@ import { TaskRepeatWeekDayInfo } from './taskRepeatWeekDayInfo';
 
 
 export interface TaskRepeatWeekInfo { 
-    deadlineStrategy: TaskRepeatWeekInfo.DeadlineStrategyEnum;
     /**
      * Date until the tasks repeat
      */
     endDate: string;
     weekDayInfos: Array<TaskRepeatWeekDayInfo>;
 }
-export namespace TaskRepeatWeekInfo {
-    export type DeadlineStrategyEnum = 'DEADLINE_EQUAL_START' | 'DEADLINE_FIT_START';
-    export const DeadlineStrategyEnum = {
-        EqualStart: 'DEADLINE_EQUAL_START' as DeadlineStrategyEnum,
-        FitStart: 'DEADLINE_FIT_START' as DeadlineStrategyEnum
-    };
-}
-
 

frontend/src/app/active-task-overview/active-task-overview.component.ts

@@ -93,7 +93,8 @@ export class ActiveTaskOverviewComponent implements OnInit{
   editTask(editedTask: TaskTaskgroupInfo) {
     const taskEditorInfo: TaskEditorData = {
       task: editedTask,
-      taskgroupID: editedTask.taskgroups[editedTask.taskgroups.length-1].taskgroupID
+      taskgroupID: editedTask.taskgroups[editedTask.taskgroups.length-1].taskgroupID,
+      parentTask: undefined
     };
     this.dialog.open(TaskEditorComponent, {data: taskEditorInfo, width: "600px"})
   }

frontend/src/app/dashboard/task-overview/task-overview.component.css

@@ -31,3 +31,13 @@
   text-decoration: none;
   color: black;
 }
+
+.task-title {
+  display: flex;
+  justify-content: space-between;
+}
+
+.subtask-link {
+  color: #00bc8c;
+  text-decoration: none;
+}

frontend/src/app/dashboard/task-overview/task-overview.component.html

@@ -2,7 +2,10 @@
   <button mat-raised-button class="greenBtn long-btn"(click)="openTaskCreation()">Add</button>
   <mat-card *ngFor="let task of tasks">
     <mat-card-content>
-      <h3><a class="task-link" [routerLink]="['/taskgroups', taskgroupID!, 'tasks', task.taskID]">{{task.taskName}}</a></h3>
+      <h3 class="task-title">
+        <a class="task-link" [routerLink]="['/taskgroups', taskgroupID!, 'tasks', task.taskID]">{{task.taskName}}</a>
+        <button mat-button class="subtask-link" *ngIf="task.hasSubtasks" [routerLink]="['/taskgroups', taskgroupID!, 'tasks', task.taskID]">has Subtasks</button>
+      </h3>
       <mat-progress-bar mode="determinate" value="{{task.activeTime}}" class="progress"></mat-progress-bar>
       <p class="task-info"><i>ETA: </i>{{task.activeTime}} / {{task.eta}}</p>
       <p class="task-info"><i>Limit: </i>{{task.limit}}</p>

frontend/src/app/dashboard/task-overview/task-overview.component.ts

@@ -75,7 +75,8 @@ export class TaskOverviewComponent {
   openTaskCreation() {
     const editorData: TaskEditorData = {
       task: undefined,
-      taskgroupID: this.taskgroupID!
+      taskgroupID: this.taskgroupID!,
+      parentTask: undefined
     }
     const dialogRef = this.dialog.open(TaskEditorComponent, {data: editorData, width: "600px"})
     dialogRef.afterClosed().subscribe(res => {
@@ -88,6 +89,7 @@ export class TaskOverviewComponent {
           activeTime: 0,
           overdue: res.overdue,
           taskgroupPath: [],
+          hasSubtasks: false,
           finishable: res.finishable
         }
         this.creationEmitter.emit({

frontend/src/app/taskgroups/taskgroup-dashboard/taskgroup-dashboard.component.ts

@@ -104,7 +104,8 @@ export class TaskgroupDashboardComponent implements OnInit {
   openTaskCreation() {
     const editorData: TaskEditorData = {
       task: undefined,
-      taskgroupID: this.taskgroupID
+      taskgroupID: this.taskgroupID,
+      parentTask: undefined
     }
     const dialogRef = this.dialog.open(TaskEditorComponent, {data: editorData, width: "600px"})
     dialogRef.afterClosed().subscribe(res => {

frontend/src/app/tasks/clear-task-dialog/clear-task-dialog.component.ts

@@ -1,12 +1,14 @@
 import {Component, Inject, OnInit} from '@angular/core';
 import {TaskEditorData} from "../task-editor/TaskEditorData";
-import {TaskEntityInfo, TaskgroupService} from "../../../api";
+import {TaskEntityInfo, TaskgroupService, TaskService} from "../../../api";
 import {MAT_DIALOG_DATA, MatDialogRef} from "@angular/material/dialog";
 import {MatSnackBar} from "@angular/material/snack-bar";
 
 export interface ClearTaskDialogData {
-  taskgroupID: number,
+  taskgroupID: number | undefined,
-  tasks: TaskEntityInfo[]
+  parentTaskID: number | undefined
+  tasks: TaskEntityInfo[],
+  subtasks: boolean
 }
 @Component({
   selector: 'app-clear-task-dialog',
@@ -23,7 +25,8 @@ export class ClearTaskDialogComponent implements OnInit{
   constructor(@Inject(MAT_DIALOG_DATA) public editorData: ClearTaskDialogData,
               private taskgroupService: TaskgroupService,
               private dialogRef: MatDialogRef<ClearTaskDialogComponent>,
-              private snackbar: MatSnackBar) {
+              private snackbar: MatSnackBar,
+              private taskService: TaskService) {
   }
 
   ngOnInit(): void {
@@ -48,22 +51,43 @@ export class ClearTaskDialogComponent implements OnInit{
   }
 
   clearTasks() {
-    this.taskgroupService.taskgroupsTaskgroupIDClearDelete(this.editorData.taskgroupID).subscribe({
+    if(this.editorData.subtasks) {
-      next: resp => {
+      this.taskService.tasksTaskIDSubtasksDelete(this.editorData.parentTaskID!).subscribe({
-        if(resp.status == "success") {
+        next: resp => {
-          const deletedTasks = this.editorData.tasks;
+          if(resp.status == "success") {
-          this.dialogRef.close(deletedTasks);
+            const deletedTasks = this.editorData.tasks;
+            this.dialogRef.close(deletedTasks);
+          }
+        },
+        error: err => {
+          if(err.status == 403) {
+            this.snackbar.open("No permission", "", {duration: 2000});
+          } else if(err.status == 404) {
+            this.snackbar.open("Not found", "", {duration: 2000});
+          } else {
+            this.snackbar.open("Unexpected error", "", {duration: 2000});
+          }
         }
-      },
+      })
-      error: err => {
+    } else {
-        if(err.status == 403) {
+      this.taskgroupService.taskgroupsTaskgroupIDClearDelete(this.editorData.taskgroupID!).subscribe({
-          this.snackbar.open("No permission", "", {duration: 2000});
+        next: resp => {
-        } else if(err.status == 404) {
+          if(resp.status == "success") {
-          this.snackbar.open("Not found", "", {duration: 2000});
+            const deletedTasks = this.editorData.tasks;
-        } else {
+            this.dialogRef.close(deletedTasks);
-          this.snackbar.open("Unexpected error", "", {duration: 2000});
+          }
+        },
+        error: err => {
+          if(err.status == 403) {
+            this.snackbar.open("No permission", "", {duration: 2000});
+          } else if(err.status == 404) {
+            this.snackbar.open("Not found", "", {duration: 2000});
+          } else {
+            this.snackbar.open("Unexpected error", "", {duration: 2000});
+          }
         }
-      }
+      })
-    })
+    }
+
   }
 }

frontend/src/app/tasks/task-dashboard/task-dashboard.component.html

@@ -63,7 +63,7 @@
     </ng-container>
     <ng-container matColumnDef="delete">
       <th mat-header-cell *matHeaderCellDef mat-sort-header>
-        <button mat-icon-button color="primary" (click)="repeatSelectedTasks()" [disabled]="selection.isEmpty()"><mat-icon>event_repeat</mat-icon></button>
+        <button *ngIf="subTasks.length == 0" mat-icon-button color="primary" (click)="repeatSelectedTasks()" [disabled]="selection.isEmpty()"><mat-icon>event_repeat</mat-icon></button>
       </th>
       <td mat-cell *matCellDef="let task">
         <button mat-icon-button color="warn" (click)="deleteTask(task)"><mat-icon>delete</mat-icon></button>

frontend/src/app/tasks/task-dashboard/task-dashboard.component.ts

@@ -1,4 +1,4 @@
-import {Component, Input, OnChanges, ViewChild} from '@angular/core';
+import {Component, Input, OnChanges, OnInit, ViewChild} from '@angular/core';
 import {TaskEntityInfo, TaskService} from "../../../api";
 import {MatPaginator} from "@angular/material/paginator";
 import {MatSort} from "@angular/material/sort";
@@ -20,12 +20,20 @@ import {TaskWeeklySeriesCreatorComponent} from "../task-weekly-series-creator/ta
 })
 export class TaskDashboardComponent implements OnChanges{
   ngOnChanges(): void {
-    if(this.taskgroupID != undefined) {
+    if(this.subTasks.length == 0 && this.taskgroupID != undefined) {
       this.fetchTasks()
+    } else if(this.subTasks.length > 0) {
+      this.datasource.data = this.subTasks;
+      this.datasource.paginator = this.paginator!;
+      this.datasource.sort = this.sort!;
+
+      this.displayedColumns = this.displayedColumns.filter(col => col !== 'select')
     }
   }
 
   @Input("taskgroupID") taskgroupID: number | undefined
+  @Input("subTasks") subTasks: TaskEntityInfo[] = []
+  @Input("parentTaskID") parentTaskID: number | undefined
   @ViewChild(MatPaginator) paginator: MatPaginator | undefined
   @ViewChild(MatSort) sort: MatSort | undefined
 
@@ -97,15 +105,18 @@ export class TaskDashboardComponent implements OnChanges{
   editTask(task: TaskEntityInfo) {
     const taskEditorInfo: TaskEditorData = {
       task: task,
-      taskgroupID: this.taskgroupID!
+      taskgroupID: this.taskgroupID!,
+      parentTask: undefined
     };
     const dialogRef = this.dialog.open(TaskEditorComponent, {data: taskEditorInfo, minWidth: "400px"})
   }
 
   clearTasks() {
-    const clearTaskData: ClearTaskDialogData = {
+    let clearTaskData: ClearTaskDialogData = {
       tasks: this.datasource.data,
-      taskgroupID: this.taskgroupID!
+      taskgroupID: this.taskgroupID,
+      parentTaskID: this.parentTaskID,
+      subtasks: this.subTasks.length > 0
     }
     const dialogRef = this.dialog.open(ClearTaskDialogComponent, {data: clearTaskData, width: "600px"});
     dialogRef.afterClosed().subscribe(res => {
@@ -146,5 +157,6 @@ export class TaskDashboardComponent implements OnChanges{
         resp.forEach(task => console.log(task))
       }
     })
+
   }
 }

frontend/src/app/tasks/task-detail-overview/task-detail-overview.component.html

@@ -7,7 +7,7 @@
           <div class="left">
             <div>{{taskStatus + " " + task!.taskName}}</div>
           </div>
-          <button class="right lightBlueBtn" mat-raised-button style="margin-left: auto">Add Subtask</button>
+          <button class="right lightBlueBtn" mat-raised-button style="margin-left: auto" (click)="addSubtask()">Add Subtask</button>
         </div>
       </mat-card-title>
 
@@ -29,7 +29,7 @@
           <button mat-flat-button class="borderless-btn" color="primary" [routerLink]="['/taskgroups', taskgroup!.taskgroupID, 'tasks', task!.taskID, 'schedule']">Schedule</button>
           <button mat-flat-button class="yellowBtn" (click)="startTaskNow()">Start now</button>
           <button mat-flat-button class="grayBtn" (click)="openTaskEditor()">Edit</button>
-          <button mat-flat-button class="lightBlueBtn" *ngIf="!task.hasTaskSerie" (click)="openRepeatingTaskEditor()">Copy</button>
+          <button mat-flat-button class="lightBlueBtn" *ngIf="!task.hasTaskSerie && !task.hasParent" (click)="openRepeatingTaskEditor()">Copy</button>
           <button mat-flat-button class="greenBtn"  *ngIf="task!.finishable" (click)="finishTask()">{{task!.finished ? 'Reopen':'Finish'}}</button>
         </div>
 
@@ -42,6 +42,13 @@
     </mat-card-actions>
   </mat-card>
 
+  <mat-expansion-panel *ngIf="subTasks.length > 0" style="margin-top: 20px" expanded>
+    <mat-expansion-panel-header>Subtasks</mat-expansion-panel-header>
+    <div *ngIf="task != undefined">
+      <app-task-dashboard [subTasks]="subTasks" [taskgroupID]="taskgroupID" [parentTaskID]="task!.taskID"></app-task-dashboard>
+    </div>
+  </mat-expansion-panel>
+
 
   <mat-expansion-panel *ngIf="taskgroup != undefined && task != undefined" style="margin-top: 20px" expanded>
     <mat-expansion-panel-header>Schedules</mat-expansion-panel-header>

frontend/src/app/tasks/task-detail-overview/task-detail-overview.component.ts

@@ -50,6 +50,8 @@ export class TaskDetailOverviewComponent implements OnInit {
   currentProgress: string = "0";
   futureProgress: string = "0";
 
+  subTasks: TaskEntityInfo[] = [];
+
   constructor(private activatedRoute: ActivatedRoute,
               private taskgroupService: TaskgroupService,
               private taskService: TaskService,
@@ -100,6 +102,12 @@ export class TaskDetailOverviewComponent implements OnInit {
             this.calcProgress();
           }
         })
+
+        this.taskService.tasksTaskIDSubtasksGet(Number(params.get('taskID'))).subscribe({
+          next: resp => {
+            this.subTasks = resp;
+          }
+        })
       }
     });
   }
@@ -135,7 +143,8 @@ export class TaskDetailOverviewComponent implements OnInit {
     if(this.task != undefined) {
       const taskEditorInfo: TaskEditorData = {
         task: this.task!,
-        taskgroupID: this.taskgroupID!
+        taskgroupID: this.taskgroupID!,
+        parentTask: undefined
       };
       this.dialog.open(TaskEditorComponent, {data: taskEditorInfo, width: "600px"})
     }
@@ -166,4 +175,16 @@ export class TaskDetailOverviewComponent implements OnInit {
       minWidth: "400px"
     })
   }
+
+  addSubtask() {
+    const editorData: TaskEditorData = {
+      task: undefined,
+      taskgroupID: this.taskgroupID,
+      parentTask: this.task
+    }
+    const dialogRef = this.dialog.open(TaskEditorComponent, {
+      data: editorData,
+      minWidth: "400px"
+    })
+  }
 }

frontend/src/app/tasks/task-editor/TaskEditorData.ts

@@ -3,4 +3,5 @@ import {TaskEntityInfo, TaskTaskgroupInfo} from "../../../api";
 export interface TaskEditorData {
   taskgroupID: number;
   task: TaskTaskgroupInfo | TaskEntityInfo | undefined
+  parentTask: TaskEntityInfo | undefined
 }

frontend/src/app/tasks/task-editor/task-editor.component.html

@@ -1,6 +1,7 @@
 <h1 mat-dialog-title *ngIf="editorData.task != undefined">Edit Task ({{editorData.task!.taskName}})</h1>
-<h1 mat-dialog-title *ngIf="editorData.task == undefined">Create New Task</h1>
+<h1 mat-dialog-title *ngIf="editorData.task == undefined">Create New {{editorData.parentTask != undefined? 'Sub-':''}}Task</h1>
 <div mat-dialog-content>
+  <p *ngIf="editorData.parentTask != undefined">Create a new Subtask for the Task <i>{{editorData.parentTask!.taskName}}</i></p>
   <mat-form-field appearance="outline" class="long-form">
     <mat-label>Name</mat-label>
     <input matInput [formControl]="nameCtrl">

frontend/src/app/tasks/task-editor/task-editor.component.ts

@@ -61,7 +61,36 @@ export class TaskEditorComponent implements OnInit {
       startDate_formatted = moment(this.startDate.value).format('YYYY-MM-DDTHH:mm:ss.SSSZ');
     }
 
-    this.taskService.tasksTaskgroupIDPut(this.editorData.taskgroupID, {
+    if(this.editorData.parentTask != undefined) {
+      this.createSubTask(startDate_formatted, endDate_formatted);
+    } else {
+      this.taskService.tasksTaskgroupIDPut(this.editorData.taskgroupID, {
+        taskName: this.nameCtrl.value,
+        eta: this.etaCtrl.value,
+        startDate: startDate_formatted,
+        deadline: endDate_formatted,
+        finishable: this.finishable,
+      }).subscribe({
+        next: resp => {
+          this.dialog.close(resp);
+        },
+        error: err => {
+          if(err.status == 403) {
+            this.snackbar.open("No permission", "", {duration: 2000});
+          } else if(err.status == 404) {
+            this.snackbar.open("Taskgroup not found", "", {duration: 2000});
+          } else if(err.status == 409) {
+            this.snackbar.open("Task already exists", "", {duration: 2000});
+          } else  {
+            this.snackbar.open("Unexpected error", "", {duration: 3000});
+          }
+        }
+      })
+    }
+  }
+
+  createSubTask(startDate_formatted: string|undefined, endDate_formatted: string|undefined) {
+    this.taskService.tasksTaskIDSubtasksPut(this.editorData.parentTask!.taskID, {
       taskName: this.nameCtrl.value,
       eta: this.etaCtrl.value,
       startDate: startDate_formatted,
@@ -78,7 +107,9 @@ export class TaskEditorComponent implements OnInit {
           this.snackbar.open("Taskgroup not found", "", {duration: 2000});
         } else if(err.status == 409) {
           this.snackbar.open("Task already exists", "", {duration: 2000});
-        } else  {
+        } else if(err.status == 400) {
+          this.snackbar.open("Invalid Dates", "", {duration: 2000})
+        } else {
           this.snackbar.open("Unexpected error", "", {duration: 3000});
         }
       }
@@ -123,4 +154,6 @@ export class TaskEditorComponent implements OnInit {
       }
     })
   }
+
+  protected readonly parent = parent;
 }

frontend/src/app/tasks/task-series-creator/task-series-creator.component.html

@@ -7,13 +7,6 @@
         <mat-label>Offset</mat-label>
         <input matInput formControlName="offsetCtrl" type="number" (keypress)="($event.charCode >= 48 && $event.charCode < 58)">
       </mat-form-field>
-      <mat-form-field appearance="outline" class="long-form">
-        <mat-label>Deadline Strategy</mat-label>
-        <mat-select formControlName="deadlineStrategyCtrl">
-          <mat-option value="DEADLINE_FIT_START">Fit Next Start</mat-option>
-          <mat-option value="DEADLINE_EQUAL_START">Equal Same Start</mat-option>
-        </mat-select>
-      </mat-form-field>
       <div>
         <button mat-raised-button color="primary" matStepperNext>Next</button>
       </div>

frontend/src/app/tasks/task-series-creator/task-series-creator.component.ts

@@ -2,7 +2,6 @@ import {Component, Inject} from '@angular/core';
 import {FormBuilder, Validators} from "@angular/forms";
 import {TaskEntityInfo, TaskRepeatDayInfo, TaskseriesService} from "../../../api";
 import {MAT_DIALOG_DATA, MatDialogRef} from "@angular/material/dialog";
-import DeadlineStrategyEnum = TaskRepeatDayInfo.DeadlineStrategyEnum;
 import * as moment from "moment";
 
 
@@ -15,7 +14,6 @@ export class TaskSeriesCreatorComponent {
 
   dailyFormGroup = this._formBuilder.group({
     offsetCtrl: ['', Validators.required],
-    deadlineStrategyCtrl: ['', Validators.required]
   })
 
   endDateFormGroup = this._formBuilder.group({
@@ -32,7 +30,6 @@ export class TaskSeriesCreatorComponent {
   save() {
     this.taskSeriesService.tasksTaskIDTaskseriesDailyPost(this.task.taskID,{
       offset: Number(this.dailyFormGroup.get('offsetCtrl')!.value!),
-      deadlineStrategy: this.convertDeadlineStrategyCtrlToDeadlineEnum(),
       endingDate: moment( this.endDateFormGroup.get('endDateCtrl')!.value!).format('YYYY-MM-DDTHH:mm:ss.SSSZ')
     }).subscribe({
       next: resp => {
@@ -40,13 +37,4 @@ export class TaskSeriesCreatorComponent {
       }
     })
   }
-
-  convertDeadlineStrategyCtrlToDeadlineEnum() {
-    const deadlineStrategy = this.dailyFormGroup.get('deadlineStrategyCtrl')!.value;
-    if(deadlineStrategy === DeadlineStrategyEnum.EqualStart) {
-      return DeadlineStrategyEnum.EqualStart;
-    } else {
-      return DeadlineStrategyEnum.FitStart;
-    }
-  }
 }

frontend/src/app/tasks/task-weekly-series-creator/task-weekly-series-creator.component.html

@@ -24,14 +24,6 @@
       </div>
     </mat-accordion>
   </div>
-  <mat-form-field appearance="outline" class="long-form" id="deadline-strategy-form">
-    <mat-label>Deadline-Strategy</mat-label>
-    <mat-select formControlName="deadlineStrategyCtrl">
-      <mat-option *ngFor="let deadlineStrategy of availableDeadlineStrategys" [value]="deadlineStrategy">
-        {{deadlineStrategy}}
-      </mat-option>
-    </mat-select>
-  </mat-form-field>
 
   <mat-form-field appearance="outline" class="long-form" id="endDate-form">
     <mat-label>Ending Date</mat-label>

frontend/src/app/tasks/task-weekly-series-creator/task-weekly-series-creator.component.ts

@@ -3,7 +3,7 @@ import {MAT_DIALOG_DATA, MatDialogRef} from "@angular/material/dialog";
 import {TaskEntityInfo, TaskRepeatDayInfo, TaskRepeatWeekDayInfo, TaskseriesService} from "../../../api";
 import * as moment from "moment";
 import {FormArray, FormBuilder, FormGroup, Validators} from "@angular/forms";
-import DeadlineStrategyEnum = TaskRepeatDayInfo.DeadlineStrategyEnum;
+import DayOfWeekEnum = TaskRepeatWeekDayInfo.DayOfWeekEnum;
 
 
 @Component({
@@ -14,7 +14,6 @@ import DeadlineStrategyEnum = TaskRepeatDayInfo.DeadlineStrategyEnum;
 export class TaskWeeklySeriesCreatorComponent implements OnInit{
 
   repeatingOffsetForm: FormGroup | undefined
-  availableDeadlineStrategys: DeadlineStrategyEnum[] = ["DEADLINE_EQUAL_START", "DEADLINE_FIT_START"]
 
   constructor(private dialogRef: MatDialogRef<TaskWeeklySeriesCreatorComponent>,
               private taskRepeatingService: TaskseriesService,
@@ -27,7 +26,6 @@ export class TaskWeeklySeriesCreatorComponent implements OnInit{
       offsets: this.formbuilder.array(this.tasks.map(task => this.formbuilder.group({
         offsetCtrl: ['', [Validators.required, Validators.min(1)]]
       }))),
-      deadlineStrategyCtrl: ['', Validators.required],
       endingDateCtrl: ['', Validators.required]
 
     })
@@ -62,12 +60,12 @@ export class TaskWeeklySeriesCreatorComponent implements OnInit{
     for(let i=0; i<formArrayValues.length; i++) {
       weekDayInfos.push({
         taskID: this.tasks[i].taskID,
-        offset: Number(formArrayValues[i].offsetCtrl) * 7
+        offset: Number(formArrayValues[i].offsetCtrl) * 7,
+        dayOfWeek: this.getDayOfWeekFromTask(this.tasks[i])!
       })
     }
 
     this.taskRepeatingService.tasksTaskseriesWeeklyPost({
-      deadlineStrategy: this.repeatingOffsetForm!.controls['deadlineStrategyCtrl']!.value!,
       endDate: moment(this.repeatingOffsetForm!.controls['endingDateCtrl']!.value!).format('YYYY-MM-DDTHH:mm:ss.SSSZ'),
       weekDayInfos: weekDayInfos
     }).subscribe({
@@ -77,6 +75,21 @@ export class TaskWeeklySeriesCreatorComponent implements OnInit{
     })
   }
 
+  private getDayOfWeekFromTask(task: TaskEntityInfo): DayOfWeekEnum | undefined {
+    const weekday = moment(task.startDate).isoWeekday();
+
+    switch (weekday) {
+      case 1: return DayOfWeekEnum.Monday;
+      case 2: return DayOfWeekEnum.Tuesday;
+      case 3: return DayOfWeekEnum.Wednesday;
+      case 4: return DayOfWeekEnum.Thursday;
+      case 5: return DayOfWeekEnum.Friday;
+      case 6: return DayOfWeekEnum.Saturday;
+      case 7: return DayOfWeekEnum.Sunday;
+      default: return undefined;
+    }
+  }
+
   cancel() {
     this.dialogRef.close(false);
   }

frontend/src/app/upcoming-task-overview/upcoming-task-overview.component.ts

@@ -59,7 +59,8 @@ export class UpcomingTaskOverviewComponent implements OnInit{
   editTask(editedTask: TaskTaskgroupInfo) {
     const taskEditorInfo: TaskEditorData = {
       task: editedTask,
-      taskgroupID: editedTask.taskgroups[editedTask.taskgroups.length-1].taskgroupID
+      taskgroupID: editedTask.taskgroups[editedTask.taskgroups.length-1].taskgroupID,
+      parentTask: undefined
     };
     this.dialog.open(TaskEditorComponent, {data: taskEditorInfo, width: "600px"})
   }

openapi.yaml

@@ -1269,6 +1269,120 @@ paths:
               schema:
                 type: object
                 $ref: "#/components/schemas/SimpleStatusResponse"
+  /tasks/{taskID}/subtasks:
+    put:
+      security:
+        - API_TOKEN: []
+      tags:
+        - task
+      description: Create Subtask
+      summary: Creates Subtask
+      parameters:
+        - name: taskID
+          in: path
+          description: internal id of task
+          required: true
+          schema:
+            type: number
+            example: 1
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TaskFieldInfo'
+      responses:
+        200:
+          description: Operation successfull
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/TaskEntityInfo'
+        403:
+          description: No permission
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+        404:
+          description: Task not found
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+        400:
+          description: Invalid start/end date
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+    get:
+      security:
+        - API_TOKEN: []
+      tags:
+        - task
+      parameters:
+        - name: taskID
+          in: path
+          description: internal id of task
+          required: true
+          schema:
+            type: number
+            example: 1
+      responses:
+        200:
+          description: Operation successfull
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/TaskEntityInfo'
+        403:
+          description: No permission
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+        404:
+          description: Task not found
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+    delete:
+      security:
+        - API_TOKEN: []
+      tags:
+        - task
+      parameters:
+        - name: taskID
+          in: path
+          description: internal id of task
+          required: true
+          schema:
+            type: number
+            example: 1
+      responses:
+        200:
+          description: Operation successfull
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+        403:
+          description: No permission
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+        404:
+          description: Task not found
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SimpleStatusResponse'
+
+      
   /schedules:
     get:
       security:
@@ -2415,6 +2529,8 @@ components:
         - hasActiveSchedules
         - hasPlannedSchedules
         - hasTaskSerie
+        - hasSubtasks
+        - hasParent
       additionalProperties: false
       properties:
         taskID:
@@ -2463,6 +2579,14 @@ components:
           type: boolean
           description: determines whether the task is associated with a taskserie
           example: false
+        hasSubtasks:
+          type: boolean
+          description: determines whether a task has subtasks
+          example: true
+        hasParent:
+          type: boolean
+          description: determines whether a task is a top task or Not
+          example: false
     TaskTaskgroupInfo:
       required:
         - taskID
@@ -2714,6 +2838,7 @@ components:
         - overdue
         - taskgroupPath
         - finishable
+        - hasSubtasks
       additionalProperties: false
       properties:
         taskID:
@@ -2748,6 +2873,9 @@ components:
         finishable:
           type: boolean
           description: determines whether the task can be finished
+        hasSubtasks:
+          type: boolean
+          description: determines whether the task has subtasks
     ScheduleStatus:
       required:
         - activeMinutes
@@ -2866,7 +2994,6 @@ components:
     TaskRepeatDayInfo:
       required:
         - offset
-        - deadlineStrategy
         - endingDate
       additionalProperties: false
       properties:
@@ -2875,11 +3002,6 @@ components:
           description: number repeating days
           example: 7
           minimum: 1
-        deadlineStrategy:
-          type: string
-          enum:
-            - DEADLINE_EQUAL_START
-            - DEADLINE_FIT_START
         endingDate:
           type: string
           format: date
@@ -2888,6 +3010,7 @@ components:
       required:
         - offset
         - taskID
+        - dayOfWeek
       additionalProperties: false
       properties:
         offset:
@@ -2899,18 +3022,23 @@ components:
           type: number
           description: internal identifier of task
           example: 1
+        dayOfWeek:
+          type: string
+          description: day of week
+          enum:
+            - MONDAY
+            - TUESDAY
+            - WEDNESDAY
+            - THURSDAY
+            - FRIDAY
+            - SATURDAY
+            - SUNDAY
     TaskRepeatWeekInfo:
       required:
         - weekDayInfos
-        - deadlineStrategy
         - endDate
       additionalProperties: false
       properties:
-        deadlineStrategy:
-          type: string
-          enum:
-            - DEADLINE_EQUAL_START
-            - DEADLINE_FIT_START
         endDate:
           type: string
           format: date