import {Injectable} from "@angular/core";
import {PhotoDTO} from "../../../common/entities/PhotoDTO";
import {DirectoryDTO} from "../../../common/entities/DirectoryDTO";
import {Utils} from "../../../common/Utils";
import {Config} from "../../../common/config/public/Config";

@Injectable()
export class GalleryCacheService {


  public getDirectory(directoryName: string): DirectoryDTO {
    if (Config.Client.enableCache == false) {
      return null;
    }
    let value = localStorage.getItem(directoryName);
    if (value != null) {
      let directory: DirectoryDTO = JSON.parse(value);


      //Add references
      let addDir = (dir: DirectoryDTO) => {
        dir.photos.forEach((photo: PhotoDTO) => {
          photo.directory = dir;
        });

        dir.directories.forEach((directory: DirectoryDTO) => {
          addDir(directory);
          directory.parent = dir;
        });


      };
      addDir(directory);


      return directory;
    }
    return null;
  }

  public setDirectory(directory: DirectoryDTO): void {
    if (Config.Client.enableCache == false) {
      return;
    }

    localStorage.setItem(Utils.concatUrls(directory.path, directory.name), JSON.stringify(directory));

    directory.directories.forEach((dir: DirectoryDTO) => {
      let name = Utils.concatUrls(dir.path, dir.name);
      if (localStorage.getItem(name) == null) { //don't override existing
        localStorage.setItem(Utils.concatUrls(dir.path, dir.name), JSON.stringify(dir));
      }
    });

  }

  /**
   * Update photo state at cache too (Eg.: thumbnail rendered)
   * @param photo
   */
  public photoUpdated(photo: PhotoDTO): void {

    if (Config.Client.enableCache == false) {
      return;
    }

    let directoryName = Utils.concatUrls(photo.directory.path, photo.directory.name);
    let value = localStorage.getItem(directoryName);
    if (value != null) {
      let directory: DirectoryDTO = JSON.parse(value);
      directory.photos.forEach((p) => {
        if (p.name === photo.name) {
          //update data
          p.metadata = photo.metadata;
          p.readyThumbnails = photo.readyThumbnails;

          //save changes
          localStorage.setItem(directoryName, JSON.stringify(directory));
          return;
        }
      });
    }

  }

}