// ~/store/player.ts
import { defineStore } from 'pinia'
import type { Track } from '~/../types/types'
import { useDataStore } from '~/store/data'

export const usePlayerStore = defineStore('player', {
  state: () => ({
    currentTrack: null as Track | null,
    position: 0,
    audio: null as HTMLAudioElement | null,
    isPaused: true,
    progressionLast: 0
  }),

  actions: {
    attachAudio(el: HTMLAudioElement) {
      this.audio = el
      // attach listeners if not already attached (idempotent enough for our use)
      this.audio.addEventListener('play', () => {
        this.isPaused = false
      })
      this.audio.addEventListener('playing', () => {
        this.isPaused = false
      })
      this.audio.addEventListener('pause', () => {
        this.isPaused = true
      })
      this.audio.addEventListener('ended', () => {
        this.isPaused = true
        const track = this.currentTrack
        if (!track) return
        const dataStore = useDataStore()
        if (track.compilationId.length === 6) {
          const next = dataStore.getNextPlaylistTrack(track)
          if (next && next.compilationId === track.compilationId) {
            this.playTrack(next)
          }
        } else {
          console.log('ended')
        }
      })
    },
    async playCompilation(compilationId: string) {
      if (this.currentTrack?.compilationId === compilationId) {
        this.togglePlay()
      } else {
        const dataStore = useDataStore()
        const first = (compilationId.length === 6) ? dataStore.getFirstTrackOfPlaylist(compilationId) : dataStore.getFirstTrackOfCompilation(compilationId)
        if (first) {
          await this.playTrack(first)
        }
      }
    },
    async playTrack(track: Track) {
      // mettre à jour la piste courante uniquement après avoir géré le toggle
      if (this.currentTrack?.id === track.id) {
        this.togglePlay()
      } else {
        this.currentTrack = track
        if (!this.audio) {
          // fallback: create an audio element and attach listeners
          this.attachAudio(new Audio())
        }

        // Interrompre toute lecture en cours avant de charger une nouvelle source
        const audio = this.audio as HTMLAudioElement
        try {
          audio.pause()
        } catch (_) {}

        // on entre en phase de chargement
        this.isPaused = true
        audio.src = track.url
        audio.load()

        // lancer la lecture (seek si nécessaire une fois les metadata chargées)
        try {
          const wantedStart = track.start ?? 0

          // Attendre que les metadata soient prêtes pour pouvoir positionner currentTime
          await new Promise<void>((resolve) => {
            if (audio.readyState >= 1) return resolve()
            const onLoaded = () => resolve()
            audio.addEventListener('loadedmetadata', onLoaded, { once: true })
          })

          // Appliquer le temps de départ
          audio.currentTime = wantedStart > 0 ? wantedStart : 0

          this.isPaused = false
          await audio.play()
        } catch (err: any) {
          // Ignorer les AbortError (arrivent lorsqu'une nouvelle source est chargée rapidement)
          if (err && err.name === 'AbortError') return
          this.isPaused = true
          console.error('Impossible de lire la piste :', err)
        }
      }
    },

    togglePlay() {
      if (!this.audio) return
      if (this.audio.paused) {
        this.isPaused = false
        this.audio
          .play()
          .then(() => {
            this.isPaused = false
          })
          .catch((err) => console.error(err))
      } else {
        this.audio.pause()
        this.isPaused = true
      }
    },

    updateTime() {
      const audio = this.audio
      if (!audio) return

      // update current position
      this.position = audio.currentTime

      // compute and cache a stable progression value
      const duration = audio.duration
      const progression = (this.position / duration) * 100
      if (!isNaN(progression)) {
        this.progressionLast = progression
      }

      // auto advance behavior: playlists use 'ended', compilations use time boundary
      const track = this.currentTrack
      if (!track) return
      const dataStore = useDataStore()
      const t = audio.currentTime

      // For playlists (id length 6), do NOT forward auto-advance here; rely on 'ended'
      if (track.compilationId.length === 6) {
        const from = track.start ?? 0
        const prevTrack = dataStore.getPrevTrack(track)
        if (t < from + 0.05) {
          if (prevTrack && prevTrack.compilationId === track.compilationId) {
            this.currentTrack = prevTrack
          }
        }
        return
      }

      // For compilations, forward auto-advance at segment boundary
      const nextTrack = dataStore.getNextTrack(track)
      const to = (track.order === 0) ? Math.round(this.audio?.duration ?? 0) : nextTrack?.start
      if (!to || isNaN(to)) return
      if (t >= to - 0.05) {
        if (nextTrack && nextTrack.compilationId === track.compilationId) {
          this.currentTrack = nextTrack
        }
      } else {
        const from = track.start ?? 0
        const prevTrack = dataStore.getPrevTrack(track)
        if (t < from + 0.05) {
          if (prevTrack && prevTrack.compilationId === track.compilationId) {
            this.currentTrack = prevTrack
          }
        }
      }
    }
  },

  getters: {
    isCurrentCompilation: (state) => {
      return (compilationId: string) => compilationId === state.currentTrack?.compilationId
    },

    isPlaylistTrack: () => {
      return (track: Track) => {
        return track.compilationId.length === 6
      }
    },

    getCurrentTrack: (state) => state.currentTrack,

    getCurrentCompilation: (state) => {
      return state.currentTrack ? state.currentTrack.url : null
    },

    currentProgression(state) {
      if (!state.audio) return 0
      const duration = state.audio.duration
      const progression = (state.position / duration) * 100
      return isNaN(progression) ? state.progressionLast : progression
    }
  }
})