import { Component, ViewChild, ElementRef, AfterViewInit } from '@angular/core';
import { faTrashAlt, faCheckCircle, faTimesCircle, IconDefinition } from '@fortawesome/free-regular-svg-icons';
import { faRedoAlt, faSun, faMoon, faCircleHalfStroke, faCheck, faExternalLinkAlt, faDownload } from '@fortawesome/free-solid-svg-icons';
import { CookieService } from 'ngx-cookie-service';
import { map, Observable, of } from 'rxjs';

import { Download, DownloadsService, Status } from './downloads.service';
import { MasterCheckboxComponent } from './master-checkbox.component';
import { Formats, Format, Quality } from './formats';
import { Theme, Themes } from './theme';
import {KeyValue} from "@angular/common";

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.sass'],
})
export class AppComponent implements AfterViewInit {
  addUrl: string;
  formats: Format[] = Formats;
  qualities: Quality[];
  quality: string;
  format: string;
  folder: string;
  customNamePrefix: string;
  autoStart: boolean;
  playlistStrictMode: boolean;
  playlistItemLimit: number;
  addInProgress = false;
  themes: Theme[] = Themes;
  activeTheme: Theme;
  customDirs$: Observable<string[]>;

  @ViewChild('queueMasterCheckbox') queueMasterCheckbox: MasterCheckboxComponent;
  @ViewChild('queueDelSelected') queueDelSelected: ElementRef;
  @ViewChild('queueDownloadSelected') queueDownloadSelected: ElementRef;
  @ViewChild('doneMasterCheckbox') doneMasterCheckbox: MasterCheckboxComponent;
  @ViewChild('doneDelSelected') doneDelSelected: ElementRef;
  @ViewChild('doneClearCompleted') doneClearCompleted: ElementRef;
  @ViewChild('doneClearFailed') doneClearFailed: ElementRef;
  @ViewChild('doneRetryFailed') doneRetryFailed: ElementRef;
  @ViewChild('doneDownloadSelected') doneDownloadSelected: ElementRef;

  faTrashAlt = faTrashAlt;
  faCheckCircle = faCheckCircle;
  faTimesCircle = faTimesCircle;
  faRedoAlt = faRedoAlt;
  faSun = faSun;
  faMoon = faMoon;
  faCheck = faCheck;
  faCircleHalfStroke = faCircleHalfStroke;
  faDownload = faDownload;
  faExternalLinkAlt = faExternalLinkAlt;

  constructor(public downloads: DownloadsService, private cookieService: CookieService) {
    this.format = cookieService.get('metube_format') || 'any';
    // Needs to be set or qualities won't automatically be set
    this.setQualities()
    this.quality = cookieService.get('metube_quality') || 'best';
    this.autoStart = cookieService.get('metube_auto_start') !== 'false';

    this.activeTheme = this.getPreferredTheme(cookieService);
  }

  ngOnInit() {
    this.getConfiguration();
    this.customDirs$ = this.getMatchingCustomDir();
    this.setTheme(this.activeTheme);

    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
      if (this.activeTheme.id === 'auto') {
         this.setTheme(this.activeTheme);
      }
    });
  }

  ngAfterViewInit() {
    this.downloads.queueChanged.subscribe(() => {
      this.queueMasterCheckbox.selectionChanged();
    });
    this.downloads.doneChanged.subscribe(() => {
      this.doneMasterCheckbox.selectionChanged();
      let completed: number = 0, failed: number = 0;
      this.downloads.done.forEach(dl => {
        if (dl.status === 'finished')
          completed++;
        else if (dl.status === 'error')
          failed++;
      });
      this.doneClearCompleted.nativeElement.disabled = completed === 0;
      this.doneClearFailed.nativeElement.disabled = failed === 0;
      this.doneRetryFailed.nativeElement.disabled = failed === 0;
    });
  }

  // workaround to allow fetching of Map values in the order they were inserted
  //  https://github.com/angular/angular/issues/31420
  asIsOrder(a, b) {
    return 1;
  }

  qualityChanged() {
    this.cookieService.set('metube_quality', this.quality, { expires: 3650 });
    // Re-trigger custom directory change
    this.downloads.customDirsChanged.next(this.downloads.customDirs);
  }

  showAdvanced() {
    return this.downloads.configuration['CUSTOM_DIRS'];
  }

  allowCustomDir(tag: string) {
    if (this.downloads.configuration['CREATE_CUSTOM_DIRS']) {
      return tag;
    }
    return false;
  }

  isAudioType() {
    return this.quality == 'audio' || this.format == 'mp3'  || this.format == 'm4a' || this.format == 'opus' || this.format == 'wav' || this.format == 'flac';
  }

  getMatchingCustomDir() : Observable<string[]> {
    return this.downloads.customDirsChanged.asObservable().pipe(map((output) => {
      // Keep logic consistent with app/ytdl.py
      if (this.isAudioType()) {
        console.debug("Showing audio-specific download directories");
        return output["audio_download_dir"];
      } else {
        console.debug("Showing default download directories");
        return output["download_dir"];
      }
    }));
  }

  getConfiguration() {
    this.downloads.configurationChanged.subscribe({
      next: (config) => {
        this.playlistStrictMode = config['DEFAULT_OPTION_PLAYLIST_STRICT_MODE'];
        const playlistItemLimit = config['DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT'];
        if (playlistItemLimit !== '0') {
          this.playlistItemLimit = playlistItemLimit;
        }
      }
    });
  }

  getPreferredTheme(cookieService: CookieService) {
    let theme = 'auto';
    if (cookieService.check('metube_theme')) {
      theme = cookieService.get('metube_theme');
    }

    return this.themes.find(x => x.id === theme) ?? this.themes.find(x => x.id === 'auto');
  }

  themeChanged(theme: Theme) {
    this.cookieService.set('metube_theme', theme.id, { expires: 3650 });
    this.setTheme(theme);
  }

  setTheme(theme: Theme) {
    this.activeTheme = theme;
    if (theme.id === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
      document.documentElement.setAttribute('data-bs-theme', 'dark');
    } else {
      document.documentElement.setAttribute('data-bs-theme', theme.id);
    }
  }

  formatChanged() {
    this.cookieService.set('metube_format', this.format, { expires: 3650 });
    // Updates to use qualities available
    this.setQualities()
    // Re-trigger custom directory change
    this.downloads.customDirsChanged.next(this.downloads.customDirs);
  }

  autoStartChanged() {
    this.cookieService.set('metube_auto_start', this.autoStart ? 'true' : 'false', { expires: 3650 });
  }

  queueSelectionChanged(checked: number) {
    this.queueDelSelected.nativeElement.disabled = checked == 0;
    this.queueDownloadSelected.nativeElement.disabled = checked == 0;
  }

  doneSelectionChanged(checked: number) {
    this.doneDelSelected.nativeElement.disabled = checked == 0;
    this.doneDownloadSelected.nativeElement.disabled = checked == 0;
  }

  setQualities() {
    // qualities for specific format
    this.qualities = this.formats.find(el => el.id == this.format).qualities
    const exists = this.qualities.find(el => el.id === this.quality)
    this.quality = exists ? this.quality : 'best'
  }

  addDownload(url?: string, quality?: string, format?: string, folder?: string, customNamePrefix?: string, playlistStrictMode?: boolean, playlistItemLimit?: number, autoStart?: boolean) {
    url = url ?? this.addUrl
    quality = quality ?? this.quality
    format = format ?? this.format
    folder = folder ?? this.folder
    customNamePrefix = customNamePrefix ?? this.customNamePrefix
    playlistStrictMode = playlistStrictMode ?? this.playlistStrictMode
    playlistItemLimit = playlistItemLimit ?? this.playlistItemLimit
    autoStart = autoStart ?? this.autoStart

    console.debug('Downloading: url='+url+' quality='+quality+' format='+format+' folder='+folder+' customNamePrefix='+customNamePrefix+' playlistStrictMode='+playlistStrictMode+' playlistItemLimit='+playlistItemLimit+' autoStart='+autoStart);
    this.addInProgress = true;
    this.downloads.add(url, quality, format, folder, customNamePrefix, playlistStrictMode, playlistItemLimit, autoStart).subscribe((status: Status) => {
      if (status.status === 'error') {
        alert(`Error adding URL: ${status.msg}`);
      } else {
        this.addUrl = '';
      }
      this.addInProgress = false;
    });
  }

  downloadItemByKey(id: string) {
    this.downloads.startById([id]).subscribe();
  }

  retryDownload(key: string, download: Download) {
    this.addDownload(download.url, download.quality, download.format, download.folder, download.custom_name_prefix, download.playlist_strict_mode, download.playlist_item_limit, true);
    this.downloads.delById('done', [key]).subscribe();
  }

  delDownload(where: string, id: string) {
    this.downloads.delById(where, [id]).subscribe();
  }

  startSelectedDownloads(where: string){
    this.downloads.startByFilter(where, dl => dl.checked).subscribe();
  }

  delSelectedDownloads(where: string) {
    this.downloads.delByFilter(where, dl => dl.checked).subscribe();
  }

  clearCompletedDownloads() {
    this.downloads.delByFilter('done', dl => dl.status === 'finished').subscribe();
  }

  clearFailedDownloads() {
    this.downloads.delByFilter('done', dl => dl.status === 'error').subscribe();
  }

  retryFailedDownloads() {
    this.downloads.done.forEach((dl, key) => {
      if (dl.status === 'error') {
        this.retryDownload(key, dl);
      }
    });
  }

  downloadSelectedFiles() {
    this.downloads.done.forEach((dl, key) => {
      if (dl.status === 'finished' && dl.checked) {
        const link = document.createElement('a');
        link.href = this.buildDownloadLink(dl);
        link.setAttribute('download', dl.filename);
        link.setAttribute('target', '_self');
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
      }
    });
  }

  buildDownloadLink(download: Download) {
    let baseDir = this.downloads.configuration["PUBLIC_HOST_URL"];
    if (download.quality == 'audio' || download.filename.endsWith('.mp3')) {
      baseDir = this.downloads.configuration["PUBLIC_HOST_AUDIO_URL"];
    }

    if (download.folder) {
      baseDir += download.folder + '/';
    }

    return baseDir + encodeURIComponent(download.filename);
  }

  identifyDownloadRow(index: number, row: KeyValue<string, Download>) {
    return row.key;
  }

  isNumber(event) {
    const charCode = (event.which) ? event.which : event.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
      event.preventDefault();
    }
  }
}