// src/main/services/SoundEffectService.ts
// 녹음 시작/종료/에러/취소 효과음 재생. 설계서 01 ISoundEffectService 구현.
// fire-and-forget 패턴, WAV 프리로드(메모리 캐싱).

import { readFileSync, existsSync } from 'fs'
import { getLogger } from './LoggerService'
import { configGet, configSet } from './ConfigService'
import { getSoundPath } from '../utils/paths'

const logger = getLogger('SoundEffectService')

type SoundName = 'recording-start' | 'recording-stop' | 'error' | 'cancel' | 'chime'

/** 효과음 파일 매핑 */
const SOUND_FILES: Record<SoundName, string> = {
  'recording-start': 'recording-start.wav',
  'recording-stop': 'recording-stop.wav',
  'error': 'error.wav',
  'cancel': 'error.wav', // cancel은 error와 동일
  'chime': 'recording-stop.wav' // chime은 recording-stop 재사용 (Voice Conversation 응답 완료)
}

/** 프리로드된 WAV 바이너리 캐시 */
const soundCache = new Map<SoundName, Buffer>()

class SoundEffectService {
  private _enabled = true

  /**
   * 효과음 파일을 메모리에 프리로드한다.
   * bootstrap에서 호출.
   */
  initialize(): void {
    this._enabled = configGet('soundEnabled')

    for (const [name, filename] of Object.entries(SOUND_FILES)) {
      const filePath = getSoundPath(filename)
      if (existsSync(filePath)) {
        try {
          const buffer = readFileSync(filePath)
          soundCache.set(name as SoundName, buffer)
          logger.debug(`Sound preloaded: ${name} (${buffer.length} bytes)`)
        } catch (err) {
          logger.warn(`Failed to preload sound ${name}: ${err instanceof Error ? err.message : String(err)}`)
        }
      } else {
        logger.debug(`Sound file not found: ${filePath}`)
      }
    }

    logger.info(`SoundEffectService initialized (${soundCache.size} sounds cached, enabled: ${this._enabled})`)
  }

  /**
   * 효과음 재생 (fire-and-forget).
   * 비활성 상태면 무시. 캐시에 없으면 무시.
   */
  play(sound: SoundName): void {
    if (!this._enabled) return

    const buffer = soundCache.get(sound)
    if (!buffer) {
      logger.debug(`Sound not cached, skipping: ${sound}`)
      return
    }

    // Electron의 renderer에서 재생하도록 IPC로 전달하는 대신,
    // main process에서 직접 재생. node-wav-player 또는 child_process 사용.
    // 가장 간단한 방법: PowerShell로 WAV 재생 (Windows)
    this._playWavNative(getSoundPath(SOUND_FILES[sound]))
  }

  setEnabled(enabled: boolean): void {
    this._enabled = enabled
    configSet('soundEnabled', enabled)
    logger.info(`Sound effects ${enabled ? 'enabled' : 'disabled'}`)
  }

  isEnabled(): boolean {
    return this._enabled
  }

  dispose(): void {
    soundCache.clear()
    logger.info('SoundEffectService disposed')
  }

  /**
   * 플랫폼별 네이티브 WAV 재생 (비동기, fire-and-forget).
   * - Windows: PowerShell SoundPlayer
   * - macOS: /usr/bin/afplay
   * - Linux: aplay (alsa-utils, 대부분 기본 설치)
   */
  private _playWavNative(filePath: string): void {
    if (!existsSync(filePath)) return

    try {
      const { exec } = require('child_process') as typeof import('child_process')

      if (process.platform === 'win32') {
        const escapedPath = filePath.replace(/'/g, "''")
        exec(
          `powershell -NoProfile -Command "(New-Object Media.SoundPlayer '${escapedPath}').PlaySync()"`,
          { windowsHide: true },
          (err: Error | null) => {
            if (err) {
              logger.debug(`Sound play failed: ${err.message}`)
            }
          }
        )
      } else if (process.platform === 'darwin') {
        // macOS: afplay는 기본 포함, 쉘 인젝션 방지를 위해 execFile 사용
        const { execFile } = require('child_process') as typeof import('child_process')
        execFile('/usr/bin/afplay', [filePath], (err: Error | null) => {
          if (err) {
            logger.debug(`afplay failed: ${err.message}`)
          }
        })
      } else {
        // Linux: aplay fallback
        const { execFile } = require('child_process') as typeof import('child_process')
        execFile('aplay', ['-q', filePath], (err: Error | null) => {
          if (err) {
            logger.debug(`aplay failed: ${err.message}`)
          }
        })
      }
    } catch (err) {
      logger.debug(`Sound play error: ${err instanceof Error ? err.message : String(err)}`)
    }
  }
}

// ── 싱글톤 ──

let instance: SoundEffectService | null = null

export function getSoundEffectService(): SoundEffectService {
  if (!instance) {
    instance = new SoundEffectService()
  }
  return instance
}