import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';

import { Search } from '../../shared';
import { SortField } from './sort-field.type';
import { RateType } from './rate-type.type';
import { AuthService } from '../../core';
import {
  AuthHttp,
  RestExtractor,
  RestPagination,
  RestService,
  ResultList,
  UserService
} from '../../shared';
import { Video } from './video.model';

@Injectable()
export class VideoService {
  private static BASE_VIDEO_URL = API_URL + '/api/v1/videos/';

  videoCategories: Array<{ id: number, label: string }> = [];
  videoLicences: Array<{ id: number, label: string }> = [];
  videoLanguages: Array<{ id: number, label: string }> = [];

  constructor(
    private authService: AuthService,
    private authHttp: AuthHttp,
    private http: Http,
    private restExtractor: RestExtractor,
    private restService: RestService
  ) {}

  loadVideoCategories() {
    return this.http.get(VideoService.BASE_VIDEO_URL + 'categories')
                    .map(this.restExtractor.extractDataGet)
                    .subscribe(data => {
                      Object.keys(data).forEach(categoryKey => {
                        this.videoCategories.push({
                          id: parseInt(categoryKey),
                          label: data[categoryKey]
                        });
                      });
                    });
  }

  loadVideoLicences() {
    return this.http.get(VideoService.BASE_VIDEO_URL + 'licences')
                    .map(this.restExtractor.extractDataGet)
                    .subscribe(data => {
                      Object.keys(data).forEach(licenceKey => {
                        this.videoLicences.push({
                          id: parseInt(licenceKey),
                          label: data[licenceKey]
                        });
                      });
                    });
  }

  loadVideoLanguages() {
    return this.http.get(VideoService.BASE_VIDEO_URL + 'languages')
                    .map(this.restExtractor.extractDataGet)
                    .subscribe(data => {
                      Object.keys(data).forEach(languageKey => {
                        this.videoLanguages.push({
                          id: parseInt(languageKey),
                          label: data[languageKey]
                        });
                      });
                    });
  }

  getVideo(id: string): Observable<Video> {
    return this.http.get(VideoService.BASE_VIDEO_URL + id)
                    .map(this.restExtractor.extractDataGet)
                    .map(video_hash => new Video(video_hash))
                    .catch((res) => this.restExtractor.handleError(res));
  }

  updateVideo(video: Video) {
    const language = video.language ? video.language : null;

    const body = {
      name: video.name,
      category: video.category,
      licence: video.licence,
      language,
      description: video.description,
      tags: video.tags
    };

    const headers = new Headers({ 'Content-Type': 'application/json' });
    const options = new RequestOptions({ headers: headers });

    return this.authHttp.put(`${VideoService.BASE_VIDEO_URL}/${video.id}`, body, options)
                        .map(this.restExtractor.extractDataBool)
                        .catch(this.restExtractor.handleError);
  }

  getVideos(pagination: RestPagination, sort: SortField) {
    const params = this.restService.buildRestGetParams(pagination, sort);

    return this.http.get(VideoService.BASE_VIDEO_URL, { search: params })
                    .map(res => res.json())
                    .map(this.extractVideos)
                    .catch((res) => this.restExtractor.handleError(res));
  }

  removeVideo(id: string) {
    return this.authHttp.delete(VideoService.BASE_VIDEO_URL + id)
                        .map(this.restExtractor.extractDataBool)
                        .catch((res) => this.restExtractor.handleError(res));
  }

  searchVideos(search: Search, pagination: RestPagination, sort: SortField) {
    const params = this.restService.buildRestGetParams(pagination, sort);

    if (search.field) params.set('field', search.field);

    return this.http.get(VideoService.BASE_VIDEO_URL + 'search/' + encodeURIComponent(search.value), { search: params })
                    .map(this.restExtractor.extractDataList)
                    .map(this.extractVideos)
                    .catch((res) => this.restExtractor.handleError(res));
  }

  reportVideo(id: string, reason: string) {
    const url = VideoService.BASE_VIDEO_URL + id + '/abuse';
    const body = {
      reason
    };

    return this.authHttp.post(url, body)
                        .map(this.restExtractor.extractDataBool)
                        .catch((res) => this.restExtractor.handleError(res));
  }

  setVideoLike(id: string) {
    return this.setVideoRate(id, 'like');
  }

  setVideoDislike(id: string) {
    return this.setVideoRate(id, 'dislike');
  }

  getUserVideoRating(id: string) {
    const url = UserService.BASE_USERS_URL + '/me/videos/' + id + '/rating';

    return this.authHttp.get(url)
                        .map(this.restExtractor.extractDataGet)
                        .catch((res) => this.restExtractor.handleError(res));
  }

  blacklistVideo(id: string) {
    return this.authHttp.post(VideoService.BASE_VIDEO_URL + id + '/blacklist', {})
                        .map(this.restExtractor.extractDataBool)
                        .catch((res) => this.restExtractor.handleError(res));
  }

  private setVideoRate(id: string, rateType: RateType) {
    const url = VideoService.BASE_VIDEO_URL + id + '/rate';
    const body = {
      rating: rateType
    };

    return this.authHttp.put(url, body)
                        .map(this.restExtractor.extractDataBool)
                        .catch((res) => this.restExtractor.handleError(res));
  }

  private extractVideos(result: ResultList) {
    const videosJson = result.data;
    const totalVideos = result.total;
    const videos = [];
    for (const videoJson of videosJson) {
      videos.push(new Video(videoJson));
    }

    return { videos, totalVideos };
  }
}