// src/main/ipc/caption-handlers.ts
// Phase 10.1: Live Caption IPC 핸들러

import { ipcMain, session, desktopCapturer } from 'electron'
import { IPC_CHANNELS } from '@d3ro/core/ipc-channels'
import { ipcSuccess, ipcError, ErrorCode } from '@d3ro/core/errors'
import { getCaptionService } from '../services/CaptionService'
import type { CaptionConfig } from '@d3ro/core/types'
import {
  endCaptionOverlayDrag,
  resetCaptionOverlayPosition,
  setCaptionOverlayInteractive,
  startCaptionOverlayDrag
} from '../windows/WindowManager'

export function registerCaptionHandlers(): void {
  // ── 자막 창 손잡이 (팝업 → 메인) ──
  ipcMain.on(IPC_CHANNELS.POPUP_CAPTION.SET_INTERACTIVE, (_event, interactive: unknown) => {
    setCaptionOverlayInteractive(interactive === true)
  })
  ipcMain.on(IPC_CHANNELS.POPUP_CAPTION.DRAG_START, () => startCaptionOverlayDrag())
  ipcMain.on(IPC_CHANNELS.POPUP_CAPTION.DRAG_END, () => endCaptionOverlayDrag())
  ipcMain.on(IPC_CHANNELS.POPUP_CAPTION.RESET_POSITION, () => resetCaptionOverlayPosition())

  // 시스템 오디오 루프백: setDisplayMediaRequestHandler로 audio: 'loopback' 설정
  ipcMain.handle(IPC_CHANNELS.SYSTEM_AUDIO.ENABLE_LOOPBACK, async () => {
    session.defaultSession.setDisplayMediaRequestHandler(async (_request, callback) => {
      const sources = await desktopCapturer.getSources({ types: ['screen'] })
      if (sources.length === 0) {
        callback({})
        return
      }
      callback({ video: sources[0], audio: 'loopback' })
    })
    return ipcSuccess(undefined)
  })

  ipcMain.handle(IPC_CHANNELS.SYSTEM_AUDIO.DISABLE_LOOPBACK, async () => {
    session.defaultSession.setDisplayMediaRequestHandler(null)
    return ipcSuccess(undefined)
  })
  ipcMain.handle(IPC_CHANNELS.CAPTION.START, async () => {
    try {
      await getCaptionService().start()
      return ipcSuccess(undefined)
    } catch (err) {
      const code =
        err instanceof Error && 'code' in err
          ? (err as { code: number }).code
          : ErrorCode.CaptionStartFailed
      const message = err instanceof Error ? err.message : String(err)
      return ipcError(code, message)
    }
  })

  ipcMain.handle(IPC_CHANNELS.CAPTION.STOP, async () => {
    try {
      await getCaptionService().stop()
      return ipcSuccess(undefined)
    } catch (err) {
      const message = err instanceof Error ? err.message : String(err)
      return ipcError(ErrorCode.CaptionStartFailed, message)
    }
  })

  ipcMain.handle(IPC_CHANNELS.CAPTION.GET_STATE, async () => {
    return ipcSuccess(getCaptionService().getState())
  })

  ipcMain.handle(IPC_CHANNELS.CAPTION.SET_CONFIG, async (_event, config: Partial<CaptionConfig>) => {
    getCaptionService().setConfig(config)
    return ipcSuccess(undefined)
  })

  ipcMain.handle(IPC_CHANNELS.CAPTION.GET_CONFIG, async () => {
    return ipcSuccess(getCaptionService().getConfig())
  })

  // 렌더러 → 메인: 시스템 오디오 PCM 데이터 수신
  ipcMain.on(IPC_CHANNELS.CAPTION.SYSTEM_AUDIO_DATA, (_event, data: ArrayBuffer) => {
    getCaptionService().onSystemAudioData(Buffer.from(data))
  })
}