// ============================================================
// CamTalk Desktop — Main Process 入口
// 职责：应用生命周期管理、窗口创建、权限授予、IPC 处理
// ============================================================

import { app, BrowserWindow, dialog, ipcMain, shell, systemPreferences } from 'electron'
import { createMainWindow } from './window'
import { setupPermissions } from './permissions'
import { getBackendUrl, setBackendUrl } from './config'

// 安全的 console.log，防止管道断裂时 EPIPE 崩溃
function safeLog(...args: unknown[]): void {
  try { console.log(...args) } catch { /* EPIPE 等管道错误，忽略 */ }
}

let mainWindow: BrowserWindow | null = null

// ---- IPC 处理 ----
ipcMain.on('get-backend-url', (event) => {
  event.returnValue = getBackendUrl()
})

ipcMain.on('set-backend-url', (_, url: string) => {
  setBackendUrl(url)
  safeLog('[IPC] 后端地址已更新:', url)
})

ipcMain.on('get-version', (event) => {
  event.returnValue = app.getVersion()
})

// IPC: 渲染进程请求摄像头权限
// macOS 26 下 askForMediaAccess 对 ad-hoc 签名不弹窗，
// 因此先尝试 askForMediaAccess，若失败则仍放行让 getUserMedia 自然触发系统弹窗
ipcMain.handle('request-camera-access', async () => {
  if (process.platform !== 'darwin') return true

  const status = systemPreferences.getMediaAccessStatus('camera')
  safeLog(`[Media] 摄像头权限状态: ${status}`)

  if (status === 'granted') return true

  if (status === 'not-determined') {
    // 先尝试 askForMediaAccess（某些 macOS 版本会弹窗）
    const granted = await systemPreferences.askForMediaAccess('camera')
    safeLog(`[Media] askForMediaAccess('camera') 结果: ${granted}`)
    if (granted) return true
    // macOS 26 下 askForMediaAccess 可能不弹窗直接返回 false
    // 仍然放行，让渲染进程的 getUserMedia 尝试自然触发系统弹窗
    safeLog('[Media] askForMediaAccess 未授权，交由 getUserMedia 自然触发')
  }

  return true // 始终放行
})

// IPC: 渲染进程请求麦克风权限
ipcMain.handle('request-mic-access', async () => {
  if (process.platform !== 'darwin') return true
  const status = systemPreferences.getMediaAccessStatus('microphone')
  safeLog(`[Media] 麦克风权限状态: ${status}`)
  if (status === 'granted') return true
  if (status === 'not-determined') {
    const granted = await systemPreferences.askForMediaAccess('microphone')
    safeLog(`[Media] 麦克风权限: ${granted ? '已授予' : '已拒绝'}`)
    return granted
  }
  return false
})

/**
 * 请求 macOS 摄像头/麦克风权限
 *
 * 策略（依次尝试）：
 *   1. systemPreferences.askForMediaAccess — 正式签名时弹系统 TCC 弹窗
 *   2. renderer 执行 getUserMedia — 兜底触发 macOS TCC 弹窗
 *   3. 若仍未授权 → 应用内弹窗引导用户一键打开系统设置，并自动轮询权限变化
 */
async function requestMediaAccess(win: BrowserWindow): Promise<void> {
  if (process.platform !== 'darwin') return

  // ---------- 摄像头 ----------
  let camStatus = systemPreferences.getMediaAccessStatus('camera')
  safeLog(`[Media] 摄像头初始状态: ${camStatus}`)

  if (camStatus !== 'granted') {
    if (camStatus === 'not-determined') {
      const asked = await systemPreferences.askForMediaAccess('camera')
      safeLog(`[Media] askForMediaAccess('camera') => ${asked}`)
    }

    camStatus = systemPreferences.getMediaAccessStatus('camera')
    if (camStatus !== 'granted') {
      safeLog('[Media] 尝试 getUserMedia 兜底触发 TCC...')
      try {
        await win.webContents.executeJavaScript(`
          navigator.mediaDevices.getUserMedia({ video: true })
            .then(s => { s.getTracks().forEach(t => t.stop()); true })
            .catch(() => false)
        `, true)
      } catch (e) {
        safeLog('[Media] getUserMedia 异常:', e)
      }
      await new Promise(r => setTimeout(r, 2000))
    }

    camStatus = systemPreferences.getMediaAccessStatus('camera')
    safeLog(`[Media] 摄像头最终状态: ${camStatus}`)
    if (camStatus !== 'granted') {
      await showPermissionDialog(win, 'camera')
    }
  }

  // ---------- 麦克风 ----------
  let micStatus = systemPreferences.getMediaAccessStatus('microphone')
  safeLog(`[Media] 麦克风初始状态: ${micStatus}`)

  if (micStatus !== 'granted') {
    if (micStatus === 'not-determined') {
      const asked = await systemPreferences.askForMediaAccess('microphone')
      safeLog(`[Media] askForMediaAccess('microphone') => ${asked}`)
    }

    micStatus = systemPreferences.getMediaAccessStatus('microphone')
    if (micStatus !== 'granted') {
      try {
        await win.webContents.executeJavaScript(`
          navigator.mediaDevices.getUserMedia({ audio: true })
            .then(s => { s.getTracks().forEach(t => t.stop()); true })
            .catch(() => false)
        `, true)
      } catch (e) {
        safeLog('[Media] getUserMedia 异常:', e)
      }
      await new Promise(r => setTimeout(r, 2000))
    }

    micStatus = systemPreferences.getMediaAccessStatus('microphone')
    safeLog(`[Media] 麦克风最终状态: ${micStatus}`)
    if (micStatus !== 'granted') {
      await showPermissionDialog(win, 'microphone')
    }
  }
}

/**
 * 应用内权限引导弹窗
 * - 一键打开系统设置对应的隐私页面
 * - 后台自动轮询权限状态，授权后立刻通知 renderer 刷新
 */
async function showPermissionDialog(
  win: BrowserWindow,
  type: 'camera' | 'microphone',
): Promise<void> {
  const label = type === 'camera' ? '摄像头' : '麦克风'
  const settingsURL =
    type === 'camera'
      ? 'x-apple.systempreferences:com.apple.preference.security?Privacy_Camera'
      : 'x-apple.systempreferences:com.apple.preference.security?Privacy_Microphone'

  safeLog(`[Media] 弹出${label}权限引导弹窗`)

  const { response } = await dialog.showMessageBox(win, {
    type: 'info',
    title: `需要${label}权限`,
    message: `CamTalk 需要${label}权限才能正常使用。`,
    detail:
      `请点击下方按钮打开系统设置，在列表中找到「Electron」并开启${label}权限。\n\n` +
      `授权后应用会自动检测并立即启用。`,
    buttons: [`打开${label}设置`, '暂时跳过'],
    defaultId: 0,
    cancelId: 1,
  })

  if (response === 0) {
    shell.openExternal(settingsURL)

    // 轮询等待用户授权（最多 120 秒）
    safeLog(`[Media] 开始轮询${label}权限状态...`)
    const granted = await pollPermission(type, 120_000)
    if (granted) {
      safeLog(`[Media] ✅ ${label}权限已授予，通知 renderer 刷新`)
      win.webContents.send('permission-granted', type)
    } else {
      safeLog(`[Media] ⏰ ${label}权限轮询超时`)
    }
  }
}

/** 轮询权限状态直到 granted 或超时 */
function pollPermission(
  type: 'camera' | 'microphone',
  timeoutMs: number,
): Promise<boolean> {
  return new Promise((resolve) => {
    const start = Date.now()
    const timer = setInterval(() => {
      const status = systemPreferences.getMediaAccessStatus(type)
      if (status === 'granted') {
        clearInterval(timer)
        resolve(true)
      } else if (Date.now() - start > timeoutMs) {
        clearInterval(timer)
        resolve(false)
      }
    }, 1000)
  })
}

app.whenReady().then(async () => {
  setupPermissions()

  mainWindow = createMainWindow()

  // macOS: 窗口加载完成后主动请求摄像头和麦克风权限
  mainWindow.webContents.once('did-finish-load', async () => {
    safeLog('[Media] 页面加载完成，开始请求媒体权限...')
    await requestMediaAccess(mainWindow!)
  })

  // 安全地转发渲染进程日志（防 EPIPE 崩溃）
  mainWindow.webContents.on('console-message', (_event, _level, message) => {
    if (!message.includes('Autofill') && !message.includes('Failed to fetch')) {
      safeLog(`[Renderer] ${message}`)
    }
  })

  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      mainWindow = createMainWindow()
    }
  })
})

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('web-contents-created', (_, contents) => {
  contents.setWindowOpenHandler(({ url }) => {
    if (url.startsWith('http://localhost:')) {
      return { action: 'allow' }
    }
    shell.openExternal(url)
    return { action: 'deny' }
  })
})