import path from 'path'
import music from '../../utils/music'
import { getRandom, checkPath, assertApiSupport } from '../../utils'

// state
const state = {
  listInfo: {
    list: [],
    id: null,
  },
  playIndex: -1,
  changePlay: false,
  isShowPlayerDetail: false,
  playedList: [],

  playMusicInfo: null,
  tempPlayList: [],
}

let urlRequest
let picRequest
let lrcRequest

const filterList = async({ playedList, listInfo, savePath, commit }) => {
  // if (this.list.listName === null) return
  let list
  let canPlayList = []
  const filteredPlayedList = playedList.filter(({ listId, isTempPlay }) => listInfo.id === listId && !isTempPlay).map(({ musicInfo }) => musicInfo)
  if (listInfo.id == 'download') {
    list = []
    for (const item of listInfo.list) {
      const filePath = path.join(savePath, item.fileName)
      if (!await checkPath(filePath) || !item.isComplate || /\.ape$/.test(filePath)) continue

      canPlayList.push(item)

      // 排除已播放音乐
      let index = filteredPlayedList.indexOf(item)
      if (index > -1) {
        filteredPlayedList.splice(index, 1)
        continue
      }
      list.push(item)
    }
  } else {
    list = listInfo.list.filter(s => {
      if (!assertApiSupport(s.source)) return false
      canPlayList.push(s)

      let index = filteredPlayedList.indexOf(s)
      if (index > -1) {
        filteredPlayedList.splice(index, 1)
        return false
      }
      return true
    })
  }
  if (!list.length && playedList.length) {
    commit('clearPlayedList')
    return canPlayList
  }
  return list
}

// getters
const getters = {
  list: state => state.listInfo.list,
  changePlay: satte => satte.changePlay,
  playInfo(state) {
    if (state.playMusicInfo == null) return { listId: null, playIndex: -1, playListId: null, listPlayIndex: -1, isPlayList: false, musicInfo: null }
    const playListId = state.listInfo.id
    let listId = state.playMusicInfo.listId
    const isTempPlay = !!state.playMusicInfo.isTempPlay
    const isPlayList = listId === playListId
    let playIndex = -1
    let listPlayIndex = state.playIndex

    if (listId != '__temp__') {
      if (isPlayList) {
        playIndex = state.listInfo.list.indexOf(state.playMusicInfo.musicInfo)
        if (!isTempPlay) listPlayIndex = playIndex
      } else {
        let list = window.allList[listId]
        if (list) playIndex = list.list.indexOf(state.playMusicInfo.musicInfo)
      }
    }
    // console.log({
    //   listId,
    //   playIndex,
    //   playListId,
    //   listPlayIndex,
    //   isPlayList,
    //   isTempPlay,
    //   musicInfo: state.playMusicInfo.musicInfo,
    // })
    return {
      listId,
      playIndex,
      playListId,
      listPlayIndex,
      isPlayList,
      isTempPlay,
      musicInfo: state.playMusicInfo.musicInfo,
    }
  },
  isShowPlayerDetail: state => state.isShowPlayerDetail,
  playMusicInfo: state => state.playMusicInfo,
  playedList: state => state.playedList,
  tempPlayList: state => state.tempPlayList,
}

// actions
const actions = {
  getUrl({ commit, state }, { musicInfo, originMusic, type, isRefresh }) {
    if (!musicInfo._types[type]) {
      // 兼容旧版酷我源搜索列表过滤128k音质的bug
      if (!(musicInfo.source == 'kw' && type == '128k')) return Promise.reject(new Error('该歌曲没有可播放的音频'))

      // return Promise.reject(new Error('该歌曲没有可播放的音频'))
    }
    if (urlRequest && urlRequest.cancelHttp) urlRequest.cancelHttp()
    if (musicInfo.typeUrl[type] && !isRefresh) return Promise.resolve(musicInfo.typeUrl[type])
    urlRequest = music[musicInfo.source].getMusicUrl(musicInfo, type)
    return urlRequest.promise.then(({ url }) => {
      if (originMusic) commit('setUrl', { musicInfo: originMusic, url, type })
      commit('setUrl', { musicInfo, url, type })
      urlRequest = null
      return url
    }).catch(err => {
      urlRequest = null
      return Promise.reject(err)
    })
  },
  getPic({ commit, state }, musicInfo) {
    if (picRequest && picRequest.cancelHttp) picRequest.cancelHttp()
    picRequest = music[musicInfo.source].getPic(musicInfo)
    return picRequest.promise.then(url => {
      picRequest = null
      commit('getPic', { musicInfo, url })
    }).catch(err => {
      picRequest = null
      return Promise.reject(err)
    })
  },
  getLrc({ commit, state }, musicInfo) {
    if (lrcRequest && lrcRequest.cancelHttp) lrcRequest.cancelHttp()
    if (musicInfo.lrc && musicInfo.tlrc != null) {
      if (musicInfo.lrc.startsWith('\ufeff[id:$00000000]')) {
        let str = musicInfo.lrc.replace('\ufeff[id:$00000000]\n', '')
        commit('setLrc', { musicInfo, lyric: str, tlyric: musicInfo.tlrc })
      }
      return Promise.resolve()
    }


    lrcRequest = music[musicInfo.source].getLyric(musicInfo)
    return lrcRequest.promise.then(({ lyric, tlyric }) => {
      lrcRequest = null
      commit('setLrc', { musicInfo, lyric, tlyric })
    }).catch(err => {
      lrcRequest = null
      return Promise.reject(err)
    })
  },

  async playPrev({ state, rootState, commit, getters }) {
    const currentListId = state.listInfo.id
    const currentList = state.listInfo.list
    if (state.playedList.length) {
      // 从已播放列表移除播放列表已删除的歌曲
      let index
      for (index = state.playedList.indexOf(state.playMusicInfo) - 1; index > -1; index--) {
        const playMusicInfo = state.playedList[index]
        if (playMusicInfo.listId == currentListId && !currentList.includes(playMusicInfo.musicInfo)) {
          commit('removePlayedList', index)
          continue
        }
        break
      }

      if (index > -1) {
        commit('setPlayMusicInfo', state.playedList[index])
        return
      }
    }

    let filteredList = await filterList({
      listInfo: state.listInfo,
      playedList: state.playedList,
      savePath: rootState.setting.download.savePath,
      commit,
    })
    if (!filteredList.length) return commit('setPlayMusicInfo', null)
    const playInfo = getters.playInfo
    let currentIndex = filteredList.indexOf(currentList[playInfo.listPlayIndex])
    if (currentIndex == -1) currentIndex = 0
    let nextIndex = currentIndex
    if (!playInfo.isTempPlay) {
      switch (rootState.setting.player.togglePlayMethod) {
        case 'random':
          nextIndex = getRandom(0, filteredList.length)
          break
        case 'listLoop':
        case 'list':
          nextIndex = currentIndex === 0 ? filteredList.length - 1 : currentIndex - 1
          break
        case 'singleLoop':
          break
        default:
          nextIndex = -1
          return
      }
      if (nextIndex < 0) return
    }

    commit('setPlayMusicInfo', {
      musicInfo: filteredList[nextIndex],
      listId: currentListId,
    })
  },
  async playNext({ state, rootState, commit, getters }) {
    if (state.tempPlayList.length) {
      const playMusicInfo = state.tempPlayList[0]
      commit('removeTempPlayList', 0)
      commit('setPlayMusicInfo', playMusicInfo)
      return
    }
    const currentListId = state.listInfo.id
    const currentList = state.listInfo.list
    if (state.playedList.length) {
      // 从已播放列表移除播放列表已删除的歌曲
      let index
      for (index = state.playedList.indexOf(state.playMusicInfo) + 1; index < state.playedList.length; index++) {
        const playMusicInfo = state.playedList[index]
        if (playMusicInfo.listId == currentListId && !currentList.includes(playMusicInfo.musicInfo)) {
          commit('removePlayedList', index)
          continue
        }
        break
      }

      if (index < state.playedList.length) {
        commit('setPlayMusicInfo', state.playedList[index])
        return
      }
    }
    let filteredList = await filterList({
      listInfo: state.listInfo,
      playedList: state.playedList,
      savePath: rootState.setting.download.savePath,
      commit,
    })

    if (!filteredList.length) return commit('setPlayMusicInfo', null)
    const playInfo = getters.playInfo
    const currentIndex = filteredList.indexOf(currentList[playInfo.listPlayIndex])
    let nextIndex = currentIndex
    switch (rootState.setting.player.togglePlayMethod) {
      case 'listLoop':
        nextIndex = currentIndex === filteredList.length - 1 ? 0 : currentIndex + 1
        break
      case 'random':
        nextIndex = getRandom(0, filteredList.length)
        break
      case 'list':
        nextIndex = currentIndex === filteredList.length - 1 ? -1 : currentIndex + 1
        break
      case 'singleLoop':
        break
      default:
        nextIndex = -1
        return
    }
    if (nextIndex < 0) return

    commit('setPlayMusicInfo', {
      musicInfo: filteredList[nextIndex],
      listId: currentListId,
    })
  },
}


// mitations
const mutations = {
  setUrl(state, datas) {
    datas.musicInfo.typeUrl = Object.assign({}, datas.musicInfo.typeUrl, { [datas.type]: datas.url })
  },
  getPic(state, datas) {
    datas.musicInfo.img = datas.url
  },
  setLrc(state, datas) {
    datas.musicInfo.lrc = datas.lyric
    datas.musicInfo.tlrc = datas.tlyric
  },
  setList(state, { list, index }) {
    state.playMusicInfo = {
      musicInfo: list.list[index],
      listId: list.id,
    }
    state.listInfo = list
    state.playIndex = index
    state.changePlay = true
    // console.log(state.playMusicInfo)
    if (state.playedList.length) this.commit('player/clearPlayedList')
    if (state.tempPlayList.length) this.commit('player/clearTempPlayeList')
  },
  setPlayIndex(state, index) {
    state.playIndex = index
  },
  setChangePlay(state) {
    state.changePlay = true
  },
  resetChangePlay(state) {
    state.changePlay = false
  },
  setPlayedList(state, item) {
    // console.log(item)
    if (state.playedList.includes(item)) return
    state.playedList.push(item)
  },
  removePlayedList(state, index) {
    state.playedList.splice(index, 1)
  },
  clearPlayedList(state) {
    state.playedList.splice(0, state.playedList.length)
  },
  visiblePlayerDetail(state, visible) {
    state.isShowPlayerDetail = visible
  },
  setTempPlayList(state, list) {
    state.tempPlayList.push(...list.map(({ musicInfo, listId }) => ({ musicInfo, listId, isTempPlay: true })))
    if (!state.playMusicInfo) this.commit('player/playNext')
  },
  removeTempPlayList(state, index) {
    state.tempPlayList.splice(index, 1)
  },
  clearTempPlayeList(state) {
    state.tempPlayList.splice(0, state.tempPlayList.length)
  },

  setPlayMusicInfo(state, playMusicInfo) {
    let playIndex = state.playIndex
    if (playMusicInfo == null) {
      playIndex = -1
    } else {
      let listId = playMusicInfo.listId
      if (listId != '__temp__' && listId === state.listInfo.id) playIndex = state.listInfo.list.indexOf(state.playMusicInfo.musicInfo)
    }

    state.playMusicInfo = playMusicInfo
    state.playIndex = playIndex
    state.changePlay = true
  },
}

export default {
  namespaced: true,
  state,
  getters,
  actions,
  mutations,
}