import {StoreComponent} from "../StoreComponent";
import {FileUtils} from "../FileUtils";
import * as path from "node:path";
import * as fs from "fs";

export class GamesystemStorage {

  private gamesystemRootDir: string


  constructor(gamesystemRootDir: string) {
    this.gamesystemRootDir = gamesystemRootDir;
    FileUtils.prepareDirectoryFroWriting(gamesystemRootDir)
  }

  public storeGamesystems(gamesystems: StoreComponent[]) {
    const unreferencedFiles = this.detectUnusedGamesystemFiles(gamesystems)
    FileUtils.removeFiles(unreferencedFiles)
    gamesystems.forEach(gamesystem => this.storeGamesystem(gamesystem))
  }

  private detectUnusedGamesystemFiles(gamesystems: StoreComponent[]) {
    const unreferencedFiles: string[] = []
    const gamesystemFiles = FileUtils.listFilesInDirectory(this.gamesystemRootDir);
    while(gamesystemFiles.length > 0) {
      const currentGamesystemFile = gamesystemFiles.shift()
      const referencedGamesystemName = path.parse(path.basename(currentGamesystemFile!)).name
      const referencedGamesystem = this.findReferencedGamesystem(referencedGamesystemName, gamesystems)
      if(referencedGamesystem == undefined) {
        unreferencedFiles.push(currentGamesystemFile!)
      } else {
        const decodedJSONData = JSON.parse(referencedGamesystem!.jsonString)
        if(decodedJSONData.childsystems != undefined) {
          //Check if current file is a directory. When it is a directory, everything is fine
          if(fs.lstatSync(currentGamesystemFile!).isDirectory()) {

          } else {
            const parentDirName = path.basename(path.dirname(currentGamesystemFile!))
            if(parentDirName !== referencedGamesystemName) {
              unreferencedFiles.push(currentGamesystemFile!)
            }
          }
        }
      }

      if(fs.lstatSync(currentGamesystemFile!).isDirectory()) {
        gamesystemFiles.push(... FileUtils.listFilesInDirectory(currentGamesystemFile!))
      }
    }

    return unreferencedFiles;
  }

  private findReferencedGamesystem(referencedName: string, gamesystems: StoreComponent[]): StoreComponent | undefined {
    return gamesystems.find(gamesystem =>
      path.basename(gamesystem.fileName) === referencedName)
  }

  private storeGamesystem(gamesystem: StoreComponent) {
    const gamesystemFile = path.join(... gamesystem.fileName.split("/"))
    const completeGamesystemFile = path.join(this.gamesystemRootDir, gamesystemFile)
    FileUtils.prepareFileForWriting(completeGamesystemFile)
    fs.writeFileSync(completeGamesystemFile + ".json", gamesystem.jsonString, 'utf-8')
  }
}