/*
 * https://github.com/morethanwords/tweb
 * Copyright (C) 2019-2021 Eduard Kuzmenko
 * https://github.com/morethanwords/tweb/blob/master/LICENSE
 */

import appDocsManager, {MyDocument} from "../lib/appManagers/appDocsManager";
import { wrapPhoto } from "./wrappers";
import ProgressivePreloader from "./preloader";
import { MediaProgressLine } from "../lib/mediaPlayer";
import appMediaPlaybackController, { MediaItem, MediaSearchContext } from "./appMediaPlaybackController";
import { DocumentAttribute, Message } from "../layer";
import mediaSizes from "../helpers/mediaSizes";
import { IS_SAFARI } from "../environment/userAgent";
import appMessagesManager from "../lib/appManagers/appMessagesManager";
import rootScope from "../lib/rootScope";
import './middleEllipsis';
import { cancelEvent } from "../helpers/dom/cancelEvent";
import { attachClickEvent } from "../helpers/dom/clickEvent";
import LazyLoadQueue from "./lazyLoadQueue";
import { CancellablePromise, deferredPromise } from "../helpers/cancellablePromise";
import ListenerSetter, { Listener } from "../helpers/listenerSetter";
import noop from "../helpers/noop";
import findUpClassName from "../helpers/dom/findUpClassName";
import { joinElementsWith } from "../lib/langPack";
import { MiddleEllipsisElement } from "./middleEllipsis";
import htmlToSpan from "../helpers/dom/htmlToSpan";
import { formatFullSentTime } from "../helpers/date";
import { formatBytes } from "../helpers/number";
import throttleWithRaf from "../helpers/schedulers/throttleWithRaf";

rootScope.addEventListener('messages_media_read', ({mids, peerId}) => {
  mids.forEach(mid => {
    const attr = `[data-mid="${mid}"][data-peer-id="${peerId}"]`;
    (Array.from(document.querySelectorAll(`audio-element.is-unread${attr}, .media-round.is-unread${attr}`)) as AudioElement[]).forEach(elem => {
      elem.classList.remove('is-unread');
    });
  });
});

// https://github.com/LonamiWebs/Telethon/blob/4393ec0b83d511b6a20d8a20334138730f084375/telethon/utils.py#L1285
export function decodeWaveform(waveform: Uint8Array | number[]) {
  if(!(waveform instanceof Uint8Array)) {
    waveform = new Uint8Array(waveform);
  }

  const bitCount = waveform.length * 8;
  const valueCount = bitCount / 5 | 0;
  if(!valueCount) {
    return new Uint8Array([]);
  }

  let result: Uint8Array;
  try {
    const dataView = new DataView(waveform.buffer);
    result = new Uint8Array(valueCount);
    for(let i = 0; i < valueCount; i++) {
      const byteIndex = i * 5 / 8 | 0;
      const bitShift = i * 5 % 8;
      const value = dataView.getUint16(byteIndex, true);
      result[i] = (value >> bitShift) & 0b00011111;
    }
  } catch(err) {
    result = new Uint8Array([]);
  }

  /* var byteIndex = (valueCount - 1) / 8 | 0;
  var bitShift = (valueCount - 1) % 8;
  if(byteIndex === waveform.length - 1) {
    var value = waveform[byteIndex];
  } else {
    var value = dataView.getUint16(byteIndex, true);
  }
  console.log('decoded waveform, setting last value:', value, byteIndex, bitShift);
  result[valueCount - 1] = (value >> bitShift) & 0b00011111; */
  return result;
}

function wrapVoiceMessage(audioEl: AudioElement) {
  audioEl.classList.add('is-voice');

  const message = audioEl.message;
  const doc = appMessagesManager.getMediaFromMessage(message) as MyDocument;

  if(message.pFlags.out) {
    audioEl.classList.add('is-out');
  }

  const barWidth = 2;
  const barMargin = 2;      //mediaSizes.isMobile ? 2 : 1;
  const barHeightMin = 4;   //mediaSizes.isMobile ? 3 : 2;
  const barHeightMax = mediaSizes.isMobile ? 16 : 23;
  const availW = 150;       //mediaSizes.isMobile ? 152 : 190;

  const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
  svg.classList.add('audio-waveform');
  svg.setAttributeNS(null, 'width', '' + availW);
  svg.setAttributeNS(null, 'height', '' + barHeightMax);
  svg.setAttributeNS(null, 'viewBox', `0 0 ${availW} ${barHeightMax}`);

  const timeDiv = document.createElement('div');
  timeDiv.classList.add('audio-time');
  audioEl.append(svg, timeDiv);

  let waveform = (doc.attributes.find(attribute => attribute._ === 'documentAttributeAudio') as DocumentAttribute.documentAttributeAudio).waveform || new Uint8Array([]);
  waveform = decodeWaveform(waveform.slice(0, 63));

  //console.log('decoded waveform:', waveform);

  const normValue = Math.max(...waveform);
  const wfSize = waveform.length ? waveform.length : 100;
  const barCount = Math.min((availW / (barWidth + barMargin)) | 0, wfSize);

  let maxValue = 0;
  const maxDelta = barHeightMax - barHeightMin;

  let html = '';
  for(let i = 0, barX = 0, sumI = 0; i < wfSize; ++i) {
    const value = waveform[i] || 0;
    if((sumI + barCount) >= wfSize) { // draw bar
      sumI = sumI + barCount - wfSize;
			if(sumI < (barCount + 1) / 2) {
				if(maxValue < value) maxValue = value;
      }
      
      const bar_value = Math.max(((maxValue * maxDelta) + ((normValue + 1) / 2)) / (normValue + 1), barHeightMin);
      
      const h = `
      <rect x="${barX}" y="${barHeightMax - bar_value}" width="${barWidth}" height="${bar_value}" rx="1" ry="1"></rect>
      `;
      html += h;

      barX += barWidth + barMargin;

      if(sumI < (barCount + 1) / 2) {
        maxValue = 0;
      } else {
        maxValue = value;
      }
    } else {
      if(maxValue < value) maxValue = value;

      sumI += barCount;
    }
  }

  svg.insertAdjacentHTML('beforeend', html);
  const rects = Array.from(svg.children) as HTMLElement[];

  let progress = audioEl.querySelector('.audio-waveform') as HTMLDivElement;
  
  const onLoad = () => {
    let audio = audioEl.audio;

    const onTimeUpdate = () => {
      const lastIndex = audio.currentTime === audio.duration ? 0 : Math.ceil(audio.currentTime / audio.duration * barCount);
        
      //svg.children[lastIndex].setAttributeNS(null, 'fill', '#000');
      //svg.children[lastIndex].classList.add('active'); #Иногда пропускает полоски..
      rects.forEach((node, idx) => node.classList.toggle('active', idx < lastIndex));
      //++lastIndex;
      //console.log('lastIndex:', lastIndex, audio.currentTime);
      //}, duration * 1000 / svg.childElementCount | 0/* 63 * duration / 10 */);
    };

    if(!audio.paused || (audio.currentTime > 0 && audio.currentTime !== audio.duration)) {
      onTimeUpdate();
    }

    const throttledTimeUpdate = throttleWithRaf(onTimeUpdate);
    audioEl.addAudioListener('timeupdate', throttledTimeUpdate);
    audioEl.addAudioListener('ended', throttledTimeUpdate);

    audioEl.readyPromise.then(() => {
      let mousedown = false, mousemove = false;
      progress.addEventListener('mouseleave', (e) => {
        if(mousedown) {
          audio.play();
          mousedown = false;
        }
        mousemove = false;
      })
      progress.addEventListener('mousemove', (e) => {
        mousemove = true;
        if(mousedown) scrub(e);
      });
      progress.addEventListener('mousedown', (e) => {
        e.preventDefault();
        if(e.button !== 0) return;
        if(!audio.paused) {
          audio.pause();
        }
        
        scrub(e);
        mousedown = true;
      });
      progress.addEventListener('mouseup', (e) => {
        if(mousemove && mousedown) {
          audio.play();
          mousedown = false;
        }
      });
      attachClickEvent(progress, (e) => {
        cancelEvent(e);
        if(!audio.paused) scrub(e);
      });
      
      function scrub(e: MouseEvent | TouchEvent) {
        let offsetX: number;
        if(e instanceof MouseEvent) {
          offsetX = e.offsetX;
        } else { // touch
          const rect = (e.target as HTMLElement).getBoundingClientRect();
          offsetX = e.targetTouches[0].pageX - rect.left;
        }
        
        const scrubTime = offsetX / availW /* width */ * audio.duration;
        audio.currentTime = scrubTime;
      }
    }, noop);
    
    return () => {
      progress.remove();
      progress = null;
      audio = null;
    };
  };

  return onLoad;
}

function wrapAudio(audioEl: AudioElement) {
  const withTime = audioEl.withTime;

  const message = audioEl.message;
  const doc: MyDocument = appMessagesManager.getMediaFromMessage(message);

  const isVoice = doc.type === 'voice' || doc.type === 'round';
  const descriptionEl = document.createElement('div');
  descriptionEl.classList.add('audio-description');
  
  if(!isVoice) {
    const parts: (Node | string)[] = [];
    if(doc.audioPerformer) {
      parts.push(htmlToSpan(doc.audioPerformer));
    }

    if(withTime) {
      parts.push(formatFullSentTime(message.date));
    } else if(!parts.length) {
      parts.push(formatBytes(doc.size));
    }

    if(audioEl.showSender) {
      parts.push(appMessagesManager.wrapSenderToPeer(message));
    }

    descriptionEl.append(...joinElementsWith(parts, ' • '));
  }

  const html = `
  <div class="audio-details">
    <div class="audio-title"></div>
    <div class="audio-subtitle"><div class="audio-time"></div></div>
  </div>`;
  audioEl.insertAdjacentHTML('beforeend', html);

  const titleEl = audioEl.querySelector('.audio-title') as HTMLElement;

  const middleEllipsisEl = new MiddleEllipsisElement();
  middleEllipsisEl.dataset.fontWeight = audioEl.dataset.fontWeight;
  if(isVoice) {
    middleEllipsisEl.append(appMessagesManager.wrapSenderToPeer(message));
  } else {
    middleEllipsisEl.innerHTML = doc.audioTitle || doc.fileName;
  }

  titleEl.append(middleEllipsisEl);

  if(audioEl.showSender) {
    titleEl.append(appMessagesManager.wrapSentTime(message));
  }
  
  const subtitleDiv = audioEl.querySelector('.audio-subtitle') as HTMLDivElement;
  subtitleDiv.append(descriptionEl);

  const onLoad = () => {
    let launched = false;

    let progressLine = new MediaProgressLine(audioEl.audio, doc.supportsStreaming);

    audioEl.addAudioListener('ended', () => {
      audioEl.classList.remove('audio-show-progress');
      // Reset subtitle
      subtitleDiv.lastChild.replaceWith(descriptionEl);
      launched = false;
    });

    const onPlay = () => {
      if(!launched) {
        audioEl.classList.add('audio-show-progress');
        launched = true;

        if(progressLine) {
          subtitleDiv.lastChild.replaceWith(progressLine.container);
        }
      }
    };

    audioEl.addAudioListener('play', onPlay);

    if(!audioEl.audio.paused || audioEl.audio.currentTime > 0) {
      onPlay();
    }

    return () => {
      progressLine.removeListeners();
      progressLine.container.remove();
      progressLine = null;
    };
  };

  return onLoad;
}

function constructDownloadPreloader(tryAgainOnFail = true) {
  const preloader = new ProgressivePreloader({cancelable: true, tryAgainOnFail});
  preloader.construct();

  if(!tryAgainOnFail) {
    preloader.circle.setAttributeNS(null, 'r', '23');
    preloader.totalLength = 143.58203125;
  }

  return preloader;
}

export const findAudioTargets = (anchor: HTMLElement, useSearch: boolean) => {
  let prev: MediaItem[], next: MediaItem[];
  // if(anchor.classList.contains('search-super-item') || !useSearch) {
    const container = findUpClassName(anchor, anchor.classList.contains('search-super-item') ? 'tabs-tab' : 'bubbles-inner');
    if(container) {
      const attr = `:not([data-is-outgoing="1"])`;
      const justAudioSelector = `.audio:not(.is-voice)${attr}`;
      let selector: string;
      if(!anchor.matches(justAudioSelector)) {
        selector = `.audio.is-voice${attr}, .media-round${attr}`;
      } else {
        selector = justAudioSelector;
      }

      const elements = Array.from(container.querySelectorAll(selector)) as HTMLElement[];
      const idx = elements.indexOf(anchor);

      const mediaItems: MediaItem[] = elements.map(element => ({peerId: element.dataset.peerId.toPeerId(), mid: +element.dataset.mid}));

      prev = mediaItems.slice(0, idx);
      next = mediaItems.slice(idx + 1);
    }
  // }

  return [prev, next];
};

export default class AudioElement extends HTMLElement {
  public audio: HTMLAudioElement;
  public preloader: ProgressivePreloader;
  public message: Message.message;
  public withTime = false;
  public voiceAsMusic = false;
  public searchContext: MediaSearchContext;
  public showSender = false;
  public noAutoDownload: boolean;
  public lazyLoadQueue: LazyLoadQueue;
  public loadPromises: Promise<any>[];

  private listenerSetter = new ListenerSetter();
  private onTypeDisconnect: () => void;
  public onLoad: (autoload?: boolean) => void;
  public readyPromise: CancellablePromise<void>;

  public render() {
    this.classList.add('audio');

    this.dataset.mid = '' + this.message.mid;
    this.dataset.peerId = '' + this.message.peerId;

    const doc: MyDocument = appMessagesManager.getMediaFromMessage(this.message);
    const isRealVoice = doc.type === 'voice';
    const isVoice = !this.voiceAsMusic && isRealVoice;
    const isOutgoing = this.message.pFlags.is_outgoing;
    const uploading = isOutgoing && this.preloader;

    const durationStr = String(doc.duration | 0).toHHMMSS();

    this.innerHTML = `
    <div class="audio-toggle audio-ico">
      <div class="audio-play-icon">
        <div class="part one" x="0" y="0" fill="#fff"></div>
        <div class="part two" x="0" y="0" fill="#fff"></div>
      </div>
    </div>`;

    const toggle = this.firstElementChild as HTMLElement;

    const downloadDiv = document.createElement('div');
    downloadDiv.classList.add('audio-download');

    const isUnread = doc.type !== 'audio' && this.message && this.message.pFlags.media_unread;
    if(isUnread) {
      this.classList.add('is-unread');
    }

    if(uploading) {
      this.classList.add('is-outgoing');
      this.append(downloadDiv);
    }

    const onTypeLoad = isVoice ? wrapVoiceMessage(this) : wrapAudio(this);
    
    const audioTimeDiv = this.querySelector('.audio-time') as HTMLDivElement;
    audioTimeDiv.innerHTML = durationStr;

    const onLoad = this.onLoad = (autoload: boolean) => {
      this.onLoad = undefined;

      const audio = this.audio = appMediaPlaybackController.addMedia(this.message, autoload);

      const readyPromise = this.readyPromise = deferredPromise<void>();
      if(this.audio.readyState >= this.audio.HAVE_CURRENT_DATA) readyPromise.resolve();
      else {
        this.addAudioListener('canplay', () => readyPromise.resolve(), {once: true});
      }

      this.onTypeDisconnect = onTypeLoad();
      
      const getTimeStr = () => String(audio.currentTime | 0).toHHMMSS() + (isVoice ? (' / ' + durationStr) : '');

      const onPlay = () => {
        audioTimeDiv.innerText = getTimeStr();
        toggle.classList.toggle('playing', !audio.paused);
      };

      if(!audio.paused || (audio.currentTime > 0 && audio.currentTime !== audio.duration)) {
        onPlay();
      }

      const togglePlay = (e?: Event, paused = audio.paused) => {
        e && cancelEvent(e);

        if(paused) {
          if(appMediaPlaybackController.setSearchContext(this.searchContext)) {
            const [prev, next] = findAudioTargets(this, this.searchContext.useSearch);
            appMediaPlaybackController.setTargets({peerId: this.message.peerId, mid: this.message.mid}, prev, next);
          }

          audio.play().catch(() => {});
        } else {
          audio.pause();
        }
      };

      attachClickEvent(toggle, (e) => togglePlay(e), {listenerSetter: this.listenerSetter});

      this.addAudioListener('ended', () => {
        toggle.classList.remove('playing');
        audioTimeDiv.innerText = durationStr;
      });

      this.addAudioListener('timeupdate', () => {
        if((!audio.currentTime && audio.paused) || appMediaPlaybackController.isSafariBuffering(audio)) return;
        audioTimeDiv.innerText = getTimeStr();
      });

      this.addAudioListener('pause', () => {
        toggle.classList.remove('playing');
      });

      this.addAudioListener('play', onPlay);

      return togglePlay;
    };

    if(doc.thumbs?.length) {
      const imgs: HTMLImageElement[] = [];
      const wrapped = wrapPhoto({
        photo: doc, 
        message: null, 
        container: toggle, 
        boxWidth: 48, 
        boxHeight: 48,
        loadPromises: this.loadPromises,
        withoutPreloader: true,
        lazyLoadQueue: this.lazyLoadQueue
      });
      toggle.style.width = toggle.style.height = '';
      if(wrapped.images.thumb) imgs.push(wrapped.images.thumb);
      if(wrapped.images.full) imgs.push(wrapped.images.full);

      this.classList.add('audio-with-thumb');
      imgs.forEach(img => img.classList.add('audio-thumb'));
    }

    if(!isOutgoing) {
      let preloader: ProgressivePreloader = this.preloader;

      onLoad(doc.type !== 'audio' && !this.noAutoDownload);

      const r = (shouldPlay: boolean) => {
        if(this.audio.src) {
          return;
        }

        appMediaPlaybackController.resolveWaitingForLoadMedia(this.message.peerId, this.message.mid, this.message.pFlags.is_scheduled);

        const onDownloadInit = () => {
          if(shouldPlay) {
            appMediaPlaybackController.willBePlayed(this.audio); // prepare for loading audio
  
            if(IS_SAFARI && !this.audio.autoplay) {
              this.audio.autoplay = true;
            }
          }
        };

        onDownloadInit();

        if(!preloader) {
          if(doc.supportsStreaming) {
            this.classList.add('corner-download');

            let pauseListener: Listener;
            const onPlay = () => {
              const preloader = constructDownloadPreloader(false);
              const deferred = deferredPromise<void>();
              deferred.notifyAll({done: 75, total: 100});
              deferred.catch(() => {
                this.audio.pause();
                appMediaPlaybackController.willBePlayed(undefined);
              });
              deferred.cancel = () => {
                deferred.cancel = noop;
                const err = new Error();
                (err as any).type = 'CANCELED';
                deferred.reject(err);
              };
              preloader.attach(downloadDiv, false, deferred);

              pauseListener = this.addAudioListener('pause', () => {
                deferred.cancel();
              }, {once: true}) as any;

              onDownloadInit();
            };

            /* if(!this.audio.paused) {
              onPlay();
            } */

            const playListener: any = this.addAudioListener('play', onPlay);
            this.readyPromise.then(() => {
              this.listenerSetter.remove(playListener);
              this.listenerSetter.remove(pauseListener);
            });
          } else {
            preloader = constructDownloadPreloader();

            if(!shouldPlay) {
              this.readyPromise = deferredPromise();
            }

            const load = () => {
              onDownloadInit();

              const download = appDocsManager.downloadDoc(doc);
              
              if(!shouldPlay) {
                download.then(() => {
                  this.readyPromise.resolve();
                });
              }

              preloader.attach(downloadDiv, false, download);
              return {download};
            };

            preloader.setDownloadFunction(load);
            load();
          }
        }

        this.append(downloadDiv);

        this.classList.add('downloading');

        this.readyPromise.then(() => {
          this.classList.remove('downloading');
          downloadDiv.classList.add('downloaded');
          setTimeout(() => {
            downloadDiv.remove();
          }, 200);
  
          //setTimeout(() => {
            // release loaded audio
            if(appMediaPlaybackController.willBePlayedMedia === this.audio) {
              this.audio.play();
              appMediaPlaybackController.willBePlayed(undefined);
            }
          //}, 10e3);
        });
      };

      if(!this.audio?.src) {
        if(doc.type !== 'audio' && !this.noAutoDownload) {
          r(false);
        } else {
          attachClickEvent(toggle, () => {
            r(true);
          }, {once: true, capture: true, passive: false, listenerSetter: this.listenerSetter});
        }
      }
    } else if(uploading) {
      this.dataset.isOutgoing = '1';
      this.preloader.attach(downloadDiv, false);
      //onLoad();
    }
  }

  get addAudioListener() {
    return this.listenerSetter.add(this.audio);
  }

  disconnectedCallback() {
    if(this.isConnected) {
      return;
    }
    
    if(this.onTypeDisconnect) {
      this.onTypeDisconnect();
      this.onTypeDisconnect = null;
    }

    if(this.readyPromise) {
      this.readyPromise.reject();
    }

    this.listenerSetter.removeAll();
    this.listenerSetter = null;

    this.preloader = null;
  }
}

customElements.define("audio-element", AudioElement);