import datetime
import random
import time
from typing import List

from sqlgenerator.ColumnValue import ValueType, ColumnValue
from sqlparse.SQLColumn import SQLColumn, SQLColumnType
from sqlparse.SQLTable import SQLTable
from lorem_text import lorem

min_bigint = 0
max_bigint = 9223372036854775807

min_int = -2147483648
max_int = 2147483647

min_date = datetime.date(2023, 1, 1)
max_date = datetime.date(2024, 12, 31)

min_time = datetime.time(0,0,0)
max_time = datetime.time(23, 59, 59)


def generate_random_insert(sql_table: SQLTable):
    columnValues = []
    for column in sql_table.columns:
        columnValues.append(generate_random_column(column, columnValues))

    sql_insert_command = "INSERT INTO " + sql_table.table_name + " VALUES (${i});"
    for columnValue in columnValues:
        if columnValue.valueType == ValueType.INT:
            sql_insert_command = sql_insert_command.replace("${i}", str(columnValue.value) + ", ${i}")
        else:
            sql_insert_command = sql_insert_command.replace("${i}", "'" + columnValue.value + "', ${i}")

    sql_insert_command = sql_insert_command.replace(", ${i}", "")
    return sql_insert_command


def generate_random_column(sql_column: SQLColumn, generated_values: List[ColumnValue]):
    if sql_column.columnType == SQLColumnType.BIGINT:
        return ColumnValue(random.randint(min_bigint, max_bigint), ValueType.INT, sql_column)
    elif sql_column.columnType == SQLColumnType.INT:
        return ColumnValue(random.randint(min_int, max_int), ValueType.INT, sql_column)
    elif sql_column.columnType == SQLColumnType.VARCHAR:
        text_legnth = random.randint(1, 255)
        lorem_text = lorem.sentence()
        return ColumnValue(lorem_text[:text_legnth], ValueType.STRING, sql_column)
    elif sql_column.columnType == SQLColumnType.DATE:
        if "end" in sql_column.columnName or "max" in sql_column.columnName:
            for value in generated_values:
                if "start" in value.sqlColumn.columnName or "min" in sql_column.columnName:
                    startingDate = datetime.datetime.strptime(value.value, "%Y-%m-%d").date()
                    return generate_random_date(startingDate, max_date, sql_column)
        elif "start" in sql_column.columnName or "min" in sql_column.columnName:
            for value in generated_values:
                if "end" in value.sqlColumn.columnName or "max" in sql_column.columnName:
                    endingDate = datetime.datetime.strptime(value.value, "%Y-%m-%d").date()
                    return generate_random_date(min_date, endingDate, sql_column)
        return generate_random_date(min_date, max_date, sql_column)
    elif sql_column.columnType == SQLColumnType.TIME:
        if "end" in sql_column.columnName or "max" in sql_column.columnName:
            for value in generated_values:
                if "start" in value.sqlColumn.columnName or "min" in sql_column.columnName:
                    startingTime = datetime.datetime.strptime(value.value, "%H:%M:%S").time()
                    return generate_random_time(startingTime, max_time, sql_column)
        elif "start" in sql_column.columnName or "min" in sql_column.columnName:
            for value in generated_values:
                if "end" in value.sqlColumn.columnName or "max" in sql_column.columnName:
                    endingTime = datetime.datetime.strptime(value.value, "%H:%M:%S").time()
                    return generate_random_time(min_time, endingTime, sql_column)
        return generate_random_time(min_time, max_time, sql_column)


def generate_random_date(start_date, end_date, sql_column):
    delta = end_date - start_date
    random_days = random.randrange(delta.days + 1)
    random_date = start_date + datetime.timedelta(days=random_days)
    return ColumnValue(str(random_date), ValueType.STRING, sql_column)


def generate_random_time(start_time, end_time, sql_column):
    hours = random.randint(start_time.hour, end_time.hour)
    minutes = random.randint(start_time.minute, end_time.minute)
    seconds = random.randint(start_time.second, end_time.second)
    random_time = datetime.time(hours, minutes, seconds)
    return ColumnValue(str(random_time), ValueType.STRING, sql_column)