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

import { Document, InputFileLocation, InputStickerSet, MessagesAllStickers, MessagesFeaturedStickers, MessagesFoundStickerSets, MessagesRecentStickers, MessagesStickers, MessagesStickerSet, PhotoSize, StickerPack, StickerSet, StickerSetCovered } from '../../layer';
import { Modify } from '../../types';
import apiManager from '../mtproto/mtprotoworker';
import rootScope from '../rootScope';
import appDocsManager from './appDocsManager';
import AppStorage from '../storage';
import { MOUNT_CLASS_TO } from '../../config/debug';
import { forEachReverse } from '../../helpers/array';

// TODO: если пак будет сохранён и потом обновлён, то недостающие стикеры не подгрузит

export class AppStickersManager {
  private storage = new AppStorage<Record<string, MessagesStickerSet>>({
    storeName: 'stickerSets'
  });

  private getStickerSetPromises: {[setId: string]: Promise<MessagesStickerSet>} = {};
  private getStickersByEmoticonsPromises: {[emoticon: string]: Promise<Document[]>} = {};
  
  constructor() {
    this.getStickerSet({id: 'emoji', access_hash: ''}, {overwrite: true});

    rootScope.addMultipleEventsListeners({
      updateNewStickerSet: (update) => {
        this.saveStickerSet(update.stickerset, update.stickerset.set.id);
        rootScope.broadcast('stickers_installed', update.stickerset.set);
      }
    })
  }

  public saveStickers(docs: Document[]) {
    forEachReverse(docs, (doc, idx) => {
      doc = appDocsManager.saveDoc(doc);

      if(!doc) docs.splice(idx, 1);
      else docs[idx] = doc;
    });
  }

  public async getStickerSet(set: {
    id: string,
    access_hash: string
  }, params: Partial<{
    overwrite: boolean
  }> = {}): Promise<MessagesStickerSet> {
    if(this.getStickerSetPromises[set.id]) {
      return this.getStickerSetPromises[set.id];
    }

    return this.getStickerSetPromises[set.id] = new Promise(async(resolve, reject) => {
      if(!params.overwrite) {
        const cachedSet = await this.storage.get(set.id);
        if(cachedSet && cachedSet.documents?.length) {
          this.saveStickers(cachedSet.documents);
          resolve(cachedSet);
          delete this.getStickerSetPromises[set.id];
          return;
        }
      }

      try {
        const stickerSet = await apiManager.invokeApi('messages.getStickerSet', {
          stickerset: this.getStickerSetInput(set)
        });
  
        this.saveStickerSet(stickerSet, set.id);
  
        resolve(stickerSet);
      } catch(err) {
        resolve(null);
      }
      
      delete this.getStickerSetPromises[set.id];
    });
  }

  public async getRecentStickers(): Promise<Modify<MessagesRecentStickers.messagesRecentStickers, {
    stickers: Document[]
  }>> {
    const res = await apiManager.invokeApiHashable('messages.getRecentStickers') as MessagesRecentStickers.messagesRecentStickers;

    this.saveStickers(res.stickers);

    return res;
  }

  public getAnimatedEmojiSticker(emoji: string) {
    const stickerSet = this.storage.getFromCache('emoji');
    if(!stickerSet || !stickerSet.documents) return undefined;

    emoji = emoji.replace(/\ufe0f/g, '').replace(/🏻|🏼|🏽|🏾|🏿/g, '');
    const pack = stickerSet.packs.find(p => p.emoticon === emoji);
    return pack ? appDocsManager.getDoc(pack.documents[0]) : undefined;
  }
  
  public saveStickerSet(res: Omit<MessagesStickerSet.messagesStickerSet, '_'>, id: string) {
    //console.log('stickers save set', res);w

    const newSet: MessagesStickerSet = {
      _: 'messages.stickerSet',
      set: res.set,
      packs: res.packs,
      documents: res.documents as Document[]
    };
    
    let stickerSet = this.storage.getFromCache(id);
    if(stickerSet) {
      Object.assign(stickerSet, newSet);
    } else {
      stickerSet = this.storage.setToCache(id, newSet);
    }

    this.saveStickers(res.documents);
    
    //console.log('stickers wrote', this.stickerSets);
    const needSave = stickerSet.set.installed_date || id === 'emoji';
    this.storage.set({[id]: stickerSet}, !needSave);
  }

  public getStickerSetThumbDownloadOptions(stickerSet: StickerSet.stickerSet) {
    const thumb = stickerSet.thumbs.find(thumb => thumb._ === 'photoSize') as PhotoSize.photoSize;
    const dcId = stickerSet.thumb_dc_id;

    const isAnimated = stickerSet.pFlags?.animated;

    const input: InputFileLocation.inputStickerSetThumb = {
      _: 'inputStickerSetThumb',
      stickerset: this.getStickerSetInput(stickerSet),
      volume_id: thumb.location.volume_id,
      local_id: thumb.location.local_id
    };

    return {dcId, location: input, size: thumb.size, mimeType: isAnimated ? "application/x-tgsticker" : 'image/webp'};
  }

  /* public getStickerSetThumbURL(stickerSet: MTStickerSet) {
    const thumb = stickerSet.thumb;
    const dcId = stickerSet.thumb_dc_id;

    const isAnimated = stickerSet.pFlags?.animated;

    const input: inputStickerSetThumb = {
      _: 'inputStickerSetThumb',
      stickerset: this.getStickerSetInput(stickerSet),
      volume_id: thumb.location.volume_id,
      local_id: thumb.location.local_id
    };

    const url = getFileURL('document', this.getStickerSetThumbDownloadOptions(stickerSet));
    return url;

    //return promise;
  } */

  public getStickerSetInput(set: {id: string, access_hash: string}): InputStickerSet {
    return set.id === 'emoji' ? {
      _: 'inputStickerSetAnimatedEmoji'
    } : {
      _: 'inputStickerSetID',
      id: set.id,
      access_hash: set.access_hash
    };
  }

  public async getFeaturedStickers() {
    const res = await apiManager.invokeApiHashable('messages.getFeaturedStickers') as MessagesFeaturedStickers.messagesFeaturedStickers;
    
    res.sets.forEach(covered => {
      this.saveStickerSet({set: covered.set, documents: [], packs: []}, covered.set.id);
    });

    return res.sets;
  }

  public async toggleStickerSet(set: StickerSet.stickerSet) {
    if(set.installed_date) {
      const res = await apiManager.invokeApi('messages.uninstallStickerSet', {
        stickerset: this.getStickerSetInput(set)
      });

      if(res) {
        delete set.installed_date;
        rootScope.broadcast('stickers_deleted', set);
        this.storage.delete(set.id, true);
        return true;
      }
    } else {
      const res = await apiManager.invokeApi('messages.installStickerSet', {
        stickerset: this.getStickerSetInput(set),
        archived: false
      });

      if(res) {
        set.installed_date = Date.now() / 1000 | 0;
        rootScope.broadcast('stickers_installed', set);
        return true;
      }
    }

    return false;
  }

  public async searchStickerSets(query: string, excludeFeatured = true) {
    const flags = excludeFeatured ? 1 : 0;
    const res = await apiManager.invokeApiHashable('messages.searchStickerSets', {
      flags,
      exclude_featured: excludeFeatured || undefined,
      q: query
    }) as MessagesFoundStickerSets.messagesFoundStickerSets;

    res.sets.forEach(covered => {
      this.saveStickerSet({set: covered.set, documents: [], packs: []}, covered.set.id);
    });

    const foundSaved: StickerSetCovered[] = [];
    const cache = this.storage.getCache();
    for(let id in cache) {
      const {set} = cache[id];

      if(set.title.toLowerCase().includes(query.toLowerCase()) && !res.sets.find(c => c.set.id === set.id)) {
        foundSaved.push({_: 'stickerSetCovered', set, cover: null});
      }
    }

    return res.sets.concat(foundSaved);
  }

  public getAllStickers() {
    return apiManager.invokeApiHashable('messages.getAllStickers');
  }

  public preloadStickerSets() {
    return this.getAllStickers().then(allStickers => {
      return Promise.all((allStickers as MessagesAllStickers.messagesAllStickers).sets.map(set => this.getStickerSet(set)));
    });
  }

  public getStickersByEmoticon(emoticon: string) {
    if(this.getStickersByEmoticonsPromises[emoticon]) return this.getStickersByEmoticonsPromises[emoticon];

    return this.getStickersByEmoticonsPromises[emoticon] = Promise.all([
      apiManager.invokeApiHashable('messages.getStickers', {
        emoticon
      }),
      this.preloadStickerSets(),
      this.getRecentStickers()
    ]).then(([messagesStickers, installedSets, recentStickers]) => {
      const foundStickers = (messagesStickers as MessagesStickers.messagesStickers).stickers.map(sticker => appDocsManager.saveDoc(sticker));
      const cachedStickersAnimated: Document.document[] = [], cachedStickersStatic: Document.document[] = [];

      //console.log('getStickersByEmoticon', messagesStickers, installedSets, recentStickers);

      const iteratePacks = (packs: StickerPack.stickerPack[]) => {
        for(const pack of packs) {
          if(pack.emoticon.includes(emoticon)) {
            for(const docId of pack.documents) {
              const doc = appDocsManager.getDoc(docId);
              (doc.animated ? cachedStickersAnimated : cachedStickersStatic).push(doc);
            }
          }
        }
      };

      iteratePacks(recentStickers.packs);

      for(const set of installedSets) {
        iteratePacks(set.packs);
      }

      const stickers = [...new Set(cachedStickersAnimated.concat(cachedStickersStatic, foundStickers))]/* .filter(doc => !doc.animated) */;

      return stickers;
    });
  }
}

const appStickersManager = new AppStickersManager();
MOUNT_CLASS_TO.appStickersManager = appStickersManager;
export default appStickersManager;