mini-prog/miniprogram/game/audio/soundDirector.ts

import { type GameEffect } from '../core/gameResult'
import { DEFAULT_GAME_AUDIO_CONFIG, type AudioCueKey, type GameAudioConfig } from './audioConfig'

export class SoundDirector {
  enabled: boolean
  config: GameAudioConfig
  contexts: Partial<Record<AudioCueKey, WechatMiniprogram.InnerAudioContext>>
  loopTimers: Partial<Record<AudioCueKey, number>>
  activeGuidanceCue: AudioCueKey | null

  constructor(config: GameAudioConfig = DEFAULT_GAME_AUDIO_CONFIG) {
    this.enabled = true
    this.config = config
    this.contexts = {}
    this.loopTimers = {}
    this.activeGuidanceCue = null
  }

  configure(config: GameAudioConfig): void {
    this.config = config
    this.resetContexts()
  }

  setEnabled(enabled: boolean): void {
    this.enabled = enabled
  }

  resetContexts(): void {
    const timerKeys = Object.keys(this.loopTimers) as AudioCueKey[]
    for (const key of timerKeys) {
      const timer = this.loopTimers[key]
      if (timer) {
        clearTimeout(timer)
      }
    }
    this.loopTimers = {}

    const keys = Object.keys(this.contexts) as AudioCueKey[]
    for (const key of keys) {
      const context = this.contexts[key]
      if (!context) {
        continue
      }
      context.stop()
      context.destroy()
    }
    this.contexts = {}
    this.activeGuidanceCue = null
  }

  destroy(): void {
    this.resetContexts()
  }

  handleEffects(effects: GameEffect[]): void {
    if (!this.enabled || !this.config.enabled || !effects.length) {
      return
    }

    const hasFinishCompletion = effects.some((effect) => effect.type === 'control_completed' && effect.controlKind === 'finish')

    for (const effect of effects) {
      if (effect.type === 'session_started') {
        this.play('session_started')
        continue
      }

      if (effect.type === 'punch_feedback' && effect.tone === 'warning') {
        this.play('punch_feedback:warning')
        continue
      }

      if (effect.type === 'guidance_state_changed') {
        if (effect.guidanceState === 'searching') {
          this.startGuidanceLoop('guidance:searching')
          continue
        }
        if (effect.guidanceState === 'approaching') {
          this.startGuidanceLoop('guidance:approaching')
          continue
        }
        this.startGuidanceLoop('guidance:ready')
        continue
      }

      if (effect.type === 'control_completed') {
        this.stopGuidanceLoop()
        if (effect.controlKind === 'start') {
          this.play('control_completed:start')
          continue
        }

        if (effect.controlKind === 'finish') {
          this.play('control_completed:finish')
          continue
        }

        this.play('control_completed:control')
        continue
      }

      if (effect.type === 'session_finished') {
        this.stopGuidanceLoop()
        if (!hasFinishCompletion) {
          this.play('control_completed:finish')
        }
      }
    }
  }

  play(key: AudioCueKey): void {
    const cue = this.config.cues[key]
    if (!cue || !cue.src) {
      return
    }

    this.clearLoopTimer(key)
    const context = this.getContext(key)
    context.stop()
    if (typeof context.seek === 'function') {
      context.seek(0)
    }
    context.volume = Math.max(0, Math.min(1, this.config.masterVolume * cue.volume))
    context.play()
  }


  startGuidanceLoop(key: AudioCueKey): void {
    if (this.activeGuidanceCue === key) {
      return
    }

    this.stopGuidanceLoop()
    this.activeGuidanceCue = key
    this.play(key)
  }

  stopGuidanceLoop(): void {
    if (!this.activeGuidanceCue) {
      return
    }

    this.clearLoopTimer(this.activeGuidanceCue)
    const context = this.contexts[this.activeGuidanceCue]
    if (context) {
      context.stop()
      if (typeof context.seek === 'function') {
        context.seek(0)
      }
    }
    this.activeGuidanceCue = null
  }


  clearLoopTimer(key: AudioCueKey): void {
    const timer = this.loopTimers[key]
    if (timer) {
      clearTimeout(timer)
      delete this.loopTimers[key]
    }
  }

  handleCueEnded(key: AudioCueKey): void {
    const cue = this.config.cues[key]
    if (!cue.loop || this.activeGuidanceCue !== key || !this.enabled || !this.config.enabled) {
      return
    }

    this.clearLoopTimer(key)
    this.loopTimers[key] = setTimeout(() => {
      delete this.loopTimers[key]
      if (this.activeGuidanceCue === key && this.enabled && this.config.enabled) {
        this.play(key)
      }
    }, cue.loopGapMs) as unknown as number
  }

  getContext(key: AudioCueKey): WechatMiniprogram.InnerAudioContext {
    const existing = this.contexts[key]
    if (existing) {
      return existing
    }

    const cue = this.config.cues[key]
    const context = wx.createInnerAudioContext()
    context.src = cue.src
    context.autoplay = false
    context.loop = false
    context.obeyMuteSwitch = this.config.obeyMuteSwitch
    if (typeof context.onEnded === 'function') {
      context.onEnded(() => {
        this.handleCueEnded(key)
      })
    }
    context.volume = Math.max(0, Math.min(1, this.config.masterVolume * cue.volume))
    this.contexts[key] = context
    return context
  }
}