const { app, BrowserWindow, ipcMain, Tray, Menu, nativeImage, dialog, shell } = require('electron')
const path = require('path')
const fs = require('fs')
const ffmpegManager = require('./ffmpeg')
const deviceManager = require('./devices')

// ─── Icon helpers ──────────────────────────────────────────────────────────────
// Draw a pixel into an RGBA buffer
function setPixel(buf, x, y, W, r, g, b, a = 255) {
  if (x < 0 || y < 0 || x >= W || y >= W) return
  const i = (y * W + x) * 4
  buf[i] = r; buf[i+1] = g; buf[i+2] = b; buf[i+3] = a
}

// Anti-aliased circle helper: returns alpha 0-255 for a pixel at (px,py)
// relative to circle center (cx,cy) with radius r
function circleAlpha(px, py, cx, cy, r) {
  const d = Math.sqrt((px - cx) ** 2 + (py - cy) ** 2)
  if (d > r + 0.7) return 0
  if (d < r - 0.7) return 255
  return Math.round((r + 0.7 - d) / 1.4 * 255)
}

// Generate tray icon as raw RGBA buffer — works on all platforms
// SVG DataURL does NOT work on Windows Electron tray, RGBA buffer does.
function makeTrayIconBuffer(size = 16) {
  const buf = Buffer.alloc(size * size * 4, 0)

  for (let y = 0; y < size; y++) {
    for (let x = 0; x < size; x++) {
      // Rounded background
      const cx = size / 2 - 0.5, cy = size / 2 - 0.5, r = size / 2 - 0.5
      const dx = x - cx, dy = y - cy
      if (dx * dx + dy * dy > r * r) continue  // outside circle → transparent

      // Dark background
      setPixel(buf, x, y, size, 20, 20, 38, 255)

      // Play triangle: points (3, 2), (3, 13), (12, 7.5)
      const tL = 3, tT = 2, tB = size - 2, tR = size - 3
      const midY = (tT + tB) / 2
      // A point is inside the triangle if it satisfies all three half-plane tests
      const cross1 = (tR - tL) * (y - tT) - (midY - tT) * (x - tL)  // left-top to right
      const cross2 = (tL - tR) * (y - midY) - (tT - midY) * (x - tR) // right to left-bot
      const cross3 = (0)  * (y - tB) - (tT - tB) * (x - tL)          // left edge
      // Simplified inside-triangle check
      const inTri = x >= tL && x <= tR &&
                    y >= (tT + (midY - tT) / (tR - tL) * (x - tL) - 0.5) &&
                    y <= (tB - (tB - midY) / (tR - tL) * (x - tL) + 0.5)
      if (inTri) {
        setPixel(buf, x, y, size, 79, 142, 247, 255) // accent blue
        continue
      }

      // Red live dot — top right quadrant
      const dotCX = size * 0.78, dotCY = size * 0.22, dotR = size * 0.18
      const da = circleAlpha(x, y, dotCX, dotCY, dotR)
      if (da > 0) {
        // Inner white
        const innerA = circleAlpha(x, y, dotCX, dotCY, dotR * 0.5)
        if (innerA > 128) setPixel(buf, x, y, size, 255, 255, 255, innerA)
        else              setPixel(buf, x, y, size, 239, 68,  68,  da)
      }
    }
  }
  return buf
}

function makeTrayIcon() {
  // 1. Try to load pre-generated file (faster, better quality)
  const pngPaths = [
    path.join(__dirname, '../assets/tray-icon.png'),
    path.join(process.resourcesPath || '', '../assets/tray-icon.png')
  ]
  for (const p of pngPaths) {
    if (fs.existsSync(p)) {
      try {
        const img = nativeImage.createFromPath(p)
        if (!img.isEmpty()) {
          if (process.platform === 'darwin') img.setTemplateImage(true)
          return img
        }
      } catch {}
    }
  }

  // 2. Fallback: create from raw RGBA buffer (always works, no file needed)
  const size = process.platform === 'darwin' ? 22 : 16
  const buf  = makeTrayIconBuffer(size)
  const img  = nativeImage.createFromBuffer(buf, { width: size, height: size })
  if (process.platform === 'darwin') img.setTemplateImage(true)
  return img
}

function makeWindowIcon() {
  // Use pre-generated icon.png if available
  const pngPath = path.join(__dirname, '../assets/icon.png')
  if (fs.existsSync(pngPath)) {
    try {
      const img = nativeImage.createFromPath(pngPath)
      if (!img.isEmpty()) return img
    } catch {}
  }
  // Fallback: 32×32 RGBA buffer
  const size = 32
  const buf  = makeTrayIconBuffer(size)
  return nativeImage.createFromBuffer(buf, { width: size, height: size })
}

const isDev = process.env.NODE_ENV === 'development' || !app.isPackaged

let mainWindow = null
let tray = null
let isQuitting = false

// Persistent config storage
const configPath = path.join(app.getPath('userData'), 'config.json')

function loadConfig() {
  try {
    if (fs.existsSync(configPath)) {
      return JSON.parse(fs.readFileSync(configPath, 'utf8'))
    }
  } catch (e) {
    console.error('Failed to load config:', e)
  }
  return { streams: [], tolbek: { enabled: false, port: 5000, latency: 200 }, recording: { folder: '', segmentMinutes: 60 } }
}

function saveConfig(config) {
  try {
    fs.writeFileSync(configPath, JSON.stringify(config, null, 2), 'utf8')
  } catch (e) {
    console.error('Failed to save config:', e)
  }
}

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1100,
    height: 750,
    minWidth: 800,
    minHeight: 600,
    backgroundColor: '#1a1a2e',
    frame: false,
    titleBarStyle: 'hidden',
    titleBarOverlay: {
      color: '#16213e',
      symbolColor: '#e0e0e0',
      height: 36
    },
    webPreferences: {
      preload: path.join(__dirname, 'preload.js'),
      contextIsolation: true,
      nodeIntegration: false
    },
    icon: makeWindowIcon()
  })

  if (isDev) {
    mainWindow.loadURL('http://localhost:5173')
    mainWindow.webContents.openDevTools({ mode: 'detach' })
  } else {
    mainWindow.loadFile(path.join(__dirname, '../dist/index.html'))
  }

  // Hide to tray on close instead of quitting
  mainWindow.on('close', (event) => {
    if (!isQuitting) {
      event.preventDefault()
      mainWindow.hide()
      if (process.platform === 'darwin') {
        app.dock.hide()
      }
    }
  })
}


function createTray() {
  const trayImage = makeTrayIcon()
  tray = new Tray(trayImage)
  tray.setToolTip('SRT Streamer')
  updateTrayMenu()

  tray.on('click', () => {
    if (mainWindow) {
      if (mainWindow.isVisible()) {
        mainWindow.focus()
      } else {
        showWindow()
      }
    }
  })
}

function confirmAndQuit() {
  const activeCount = ffmpegManager.getActiveCount()
  const detail = activeCount > 0
    ? `Активных потоков: ${activeCount}. Все будут остановлены.`
    : 'Приложение будет закрыто.'

  const choice = dialog.showMessageBoxSync(mainWindow || undefined, {
    type:      'question',
    buttons:   ['Выйти', 'Отмена'],
    defaultId: 1,
    cancelId:  1,
    title:     'SRT Streamer — выход',
    message:   'Вы уверены, что хотите выйти?',
    detail
  })

  if (choice === 0) {
    isQuitting = true
    ffmpegManager.stopAllStreams()
    app.quit()
  }
}

function showWindow() {
  if (mainWindow) {
    mainWindow.show()
    mainWindow.focus()
    if (process.platform === 'darwin') {
      app.dock.show()
    }
  }
}

function updateTrayMenu(activeCount = 0) {
  if (!tray) return
  const statusLabel = activeCount > 0
    ? `▶  Активных потоков: ${activeCount}`
    : '⬛  Нет активных потоков'

  const contextMenu = Menu.buildFromTemplate([
    { label: 'SRT Streamer', enabled: false },
    { label: statusLabel, enabled: false },
    { type: 'separator' },
    { label: '📂  Открыть', click: () => showWindow() },
    { type: 'separator' },
    {
      label: '⏹  Остановить все потоки',
      enabled: activeCount > 0,
      click: () => {
        ffmpegManager.stopAllStreams()
        mainWindow && mainWindow.webContents.send('all-streams-stopped')
      }
    },
    { type: 'separator' },
    { label: '✖  Выход', click: () => confirmAndQuit() }
  ])
  tray.setContextMenu(contextMenu)
}

// IPC Handlers

ipcMain.handle('get-config', () => loadConfig())
ipcMain.handle('save-config', (_, config) => { saveConfig(config); return true })

ipcMain.handle('get-devices', async () => {
  try {
    return await deviceManager.getDevices()
  } catch (e) {
    console.error('Device enumeration error:', e)
    return { video: [], audio: [] }
  }
})

ipcMain.handle('get-windows', async () => {
  try {
    return await deviceManager.getWindows()
  } catch (e) {
    return []
  }
})

ipcMain.handle('start-stream', async (_, streamConfig) => {
  try {
    const result = await ffmpegManager.startStream(streamConfig)
    const active = ffmpegManager.getActiveCount()
    updateTrayMenu(active)
    mainWindow && mainWindow.webContents.send('stream-status', {
      id: streamConfig.id,
      status: 'running'
    })
    return { success: true }
  } catch (e) {
    return { success: false, error: e.message }
  }
})

ipcMain.handle('stop-stream', async (_, streamId) => {
  try {
    ffmpegManager.stopStream(streamId)
    const active = ffmpegManager.getActiveCount()
    updateTrayMenu(active)
    return { success: true }
  } catch (e) {
    return { success: false, error: e.message }
  }
})

ipcMain.handle('start-tolbek', async (_, config) => {
  try {
    const result = await ffmpegManager.startTolbek(config)
    return { success: true }
  } catch (e) {
    return { success: false, error: e.message }
  }
})

ipcMain.handle('stop-tolbek', async () => {
  try {
    ffmpegManager.stopTolbek()
    return { success: true }
  } catch (e) {
    return { success: false, error: e.message }
  }
})

ipcMain.handle('get-active-streams', () => {
  return ffmpegManager.getActiveStreams()
})

ipcMain.handle('pick-folder', async () => {
  const result = await dialog.showOpenDialog(mainWindow || undefined, {
    title: 'Выберите папку для записи',
    properties: ['openDirectory', 'createDirectory']
  })
  if (result.canceled || !result.filePaths.length) return null
  return result.filePaths[0]
})

ipcMain.handle('open-folder', async (_, folderPath) => {
  try { await shell.openPath(folderPath) } catch {}
})

ipcMain.handle('minimize-window', () => {
  mainWindow && mainWindow.minimize()
})

ipcMain.handle('hide-window', () => {
  mainWindow && mainWindow.hide()
})

ipcMain.on('update-tray-count', (_, count) => {
  updateTrayMenu(count)
})

// Forward FFmpeg events to renderer
ffmpegManager.on('log', (data) => {
  mainWindow && mainWindow.webContents.send('stream-log', data)
})

ffmpegManager.on('error', (data) => {
  mainWindow && mainWindow.webContents.send('stream-error', data)
  updateTrayMenu(ffmpegManager.getActiveCount())
})

ffmpegManager.on('ended', (data) => {
  mainWindow && mainWindow.webContents.send('stream-ended', data)
  updateTrayMenu(ffmpegManager.getActiveCount())
})

ffmpegManager.on('reconnecting', (data) => {
  mainWindow && mainWindow.webContents.send('stream-reconnecting', data)
})

app.whenReady().then(() => {
  createWindow()
  createTray()

  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      createWindow()
    } else {
      showWindow()
    }
  })
})

app.on('window-all-closed', (e) => {
  // Keep app running in tray
  if (process.platform !== 'darwin') {
    e.preventDefault()
  }
})

app.on('before-quit', () => {
  isQuitting = true
  ffmpegManager.stopAllStreams()
})