import { Injectable } from '@angular/core';
import { FileList, FileListResponse } from  './filelist'
import { Observable, of } from 'rxjs';
import { catchError, map, tap } from 'rxjs/operators';
import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class DataproviderService {

  private apiUrl = "http://127.0.0.1:616/api.php";

  constructor(
    private http: HttpClient
  ) {
    this.mock_EMPTYFILELIST = {
      subFolderList: [],
      musicList: [
        {
          fileName: "",
          fileSize: 0,
          modifiedTime: 0
        }
      ]
    }

    this.mock_BASEFILELIST = {
      subFolderList: ["AAAA", "BBBB"],
      musicList: [
        {
          fileName: "CCCCC.mp3",
          fileSize: 9951652,
          modifiedTime: 1556423252
        }
      ]
    }

    this.mock_FILELISTAAAA = {
      subFolderList: ["DDDD", "EEEE"],
      musicList: [
        {
          fileName: "EEEEE.mp3",
          fileSize: 9951652,
          modifiedTime: 1556423252
        }
      ]
    }

    this.mock_FILELISTBBBB = {
      subFolderList: ["FFFF", "GGGG"],
      musicList: [
        {
          fileName: "FFFFF.mp3",
          fileSize: 9951652,
          modifiedTime: 1556423252
        }
      ]
    }
  }

  mock_EMPTYFILELIST : FileList;
  mock_BASEFILELIST : FileList;
  mock_FILELISTAAAA : FileList;
  mock_FILELISTBBBB : FileList;
  
  getFileList(path : string) : Observable<FileList> {
    switch (path) {
      case "AAAA":
        return of(this.mock_FILELISTAAAA);
      case "BBBB":
        return of(this.mock_FILELISTBBBB);
      default:
        return of(this.mock_BASEFILELIST);
    }
  }

  getFileListReal(path : string) : Observable<FileList> {
    const body = new HttpParams()
      .set('do', 'getfilelist')
      .set('folder', path);
    return this.http.post<FileListResponse>(this.apiUrl, body.toString(), {
      headers: new HttpHeaders()
        .set('Content-Type', 'application/x-www-form-urlencoded')
    }).pipe(
      map(h => h.result.data),
      catchError(this.handleError<FileList>(this.mock_EMPTYFILELIST))
    );
  }

  private handleError<T>(result?: T) {
    return (error: any): Observable<T> => {
      console.error(error); // log to console instead
      return of(result as T);
    };
  }
}