'use strict'

const path = require('path')
const {
  app,
  BrowserWindow,
  Menu,
  Tray,
  ipcMain,
  powerSaveBlocker,
  shell
} = require('electron')

const { loadConfig, resolveExecutable } = require('./config')
const { LogBus } = require('./log-bus')
const { ServiceSupervisor } = require('./service')
const { DisplayManager } = require('./displays')
const { createTrayIcon } = require('./tray-icon')

// 现场只允许一个实例：两个 Console 会互相抢同一个服务端端口和同一块大屏
if (!app.requestSingleInstanceLock()) {
  app.quit()
} else {
  main()
}

function main() {
  let cfg = null
  let log = null
  let service = null
  let displays = null
  let adminWindow = null
  let tray = null
  let powerBlockerId = null
  let displayFallbackTimer = null
  let displaysEnabled = false
  let quitting = false
  let shutdownDone = false

  function resolveConfigPath() {
    if (process.env.SCOREBOARD_CONSOLE_CONFIG) {
      return path.resolve(process.env.SCOREBOARD_CONSOLE_CONFIG)
    }
    // 打包后 config.json 放在 exe 旁边，方便现场直接改，不藏在 asar 里
    if (app.isPackaged) {
      return path.join(path.dirname(app.getPath('exe')), 'config.json')
    }
    return path.join(__dirname, '..', 'config.json')
  }

  function statusSnapshot() {
    const status = service ? service.status : { state: 'stopped', stateLabel: '已停止' }
    return {
      ...status,
      configPath: cfg ? cfg.path : null,
      configWarning: cfg ? cfg.warning : null,
      displays: displays ? displays.getInfo() : [],
      powerSaveBlocked: powerBlockerId !== null ? powerSaveBlocker.isStarted(powerBlockerId) : false,
      appVersion: app.getVersion()
    }
  }

  function sendToAdmin(channel, payload) {
    if (adminWindow && !adminWindow.isDestroyed()) {
      adminWindow.webContents.send(channel, payload)
    }
  }

  function broadcastStatus() {
    sendToAdmin('service:status', statusSnapshot())
  }

  function showAdmin() {
    if (!adminWindow || adminWindow.isDestroyed()) {
      createAdminWindow()
      return
    }
    if (adminWindow.isMinimized()) adminWindow.restore()
    adminWindow.show()
    adminWindow.focus()
  }

  function createAdminWindow() {
    const { width, height } = cfg.values.admin
    adminWindow = new BrowserWindow({
      width,
      height,
      minWidth: 860,
      minHeight: 600,
      title: 'Scoreboard Console · 启动管理',
      backgroundColor: '#0f1420',
      show: false,
      webPreferences: {
        preload: path.join(__dirname, '..', 'renderer', 'preload.js'),
        contextIsolation: true,
        nodeIntegration: false,
        sandbox: true
      }
    })

    adminWindow.loadFile(path.join(__dirname, '..', 'renderer', 'index.html'))
    adminWindow.once('ready-to-show', () => adminWindow.show())

    // 关窗只隐藏，服务端和守护逻辑要继续在托盘里跑
    adminWindow.on('close', (event) => {
      if (quitting) return
      event.preventDefault()
      adminWindow.hide()
      log.push('console', '管理窗口已最小化到托盘（服务端继续运行）')
    })

    adminWindow.on('closed', () => {
      adminWindow = null
    })
  }

  function ensureDisplays() {
    if (displaysEnabled || !displays) return
    displaysEnabled = true
    if (displayFallbackTimer) {
      clearTimeout(displayFallbackTimer)
      displayFallbackTimer = null
    }
    displays.enable()
  }

  function buildTrayMenu() {
    const status = statusSnapshot()
    const busy = status.state === 'starting' || status.state === 'running' || status.state === 'stopping'
    return Menu.buildFromTemplate([
      {
        label: `服务端：${status.stateLabel}${status.healthy ? ' · 就绪' : ''}`,
        enabled: false
      },
      { type: 'separator' },
      { label: '启动服务', enabled: !busy, click: () => service.start() },
      { label: '停止服务', enabled: busy, click: () => service.stop() },
      { label: '重启服务', enabled: busy, click: () => service.restart() },
      { type: 'separator' },
      { label: '打开管理端', click: () => showAdmin() },
      {
        label: '打开服务端管理面板',
        click: () => shell.openExternal(status.adminUrl || `http://127.0.0.1:${cfg.values.server.port}/admin`)
      },
      { type: 'separator' },
      {
        label: '退出',
        click: () => {
          quitting = true
          app.quit()
        }
      }
    ])
  }

  function refreshTray() {
    if (!tray || tray.isDestroyed()) return
    const status = statusSnapshot()
    tray.setToolTip(`Scoreboard Console · ${status.stateLabel}${status.healthy ? ' · 就绪' : ''}`)
    tray.setContextMenu(buildTrayMenu())
  }

  function createTray() {
    tray = new Tray(createTrayIcon())
    tray.setToolTip('Scoreboard Console')
    tray.setContextMenu(buildTrayMenu())
    tray.on('double-click', () => showAdmin())
  }

  function registerIpc() {
    ipcMain.handle('service:get-status', () => statusSnapshot())
    ipcMain.handle('service:start', () => {
      service.start()
      return statusSnapshot()
    })
    ipcMain.handle('service:stop', async () => {
      await service.stop()
      return statusSnapshot()
    })
    ipcMain.handle('service:restart', async () => {
      await service.restart()
      return statusSnapshot()
    })
    ipcMain.handle('log:tail', () => (log ? log.tail() : []))
    ipcMain.handle('log:clear', () => {
      if (log) log.clear()
      return true
    })
    ipcMain.handle('display:relayout', () => {
      if (displays && displaysEnabled) displays.relayout()
      return statusSnapshot()
    })
    ipcMain.handle('app:open-external', (_event, url) => {
      // 只放行 http/https，避免管理窗口被注入的链接拉去执行本地协议
      if (typeof url === 'string' && /^https?:\/\//i.test(url)) {
        shell.openExternal(url)
        return true
      }
      return false
    })
    ipcMain.handle('app:open-admin-window', () => {
      showAdmin()
      return true
    })
  }

  app.on('second-instance', () => showAdmin())

  app.whenReady().then(() => {
    cfg = loadConfig(resolveConfigPath())
    log = new LogBus({
      maxLines: cfg.values.log.maxLines,
      file: path.resolve(path.dirname(cfg.path), cfg.values.log.file || 'logs/console.log'),
      maxFileBytes: cfg.values.log.maxFileBytes
    })

    log.push('console', `Scoreboard Console v${app.getVersion()} 启动（配置：${cfg.path}）`)
    if (cfg.warning) log.push('console', cfg.warning)

    const resolved = resolveExecutable(cfg.values.server.exe, cfg.path)
    log.push('console', `服务端程序：${resolved.path}`)

    service = new ServiceSupervisor({
      values: cfg.values,
      exePath: resolved.path,
      log
    })

    displays = new DisplayManager({
      values: cfg.values,
      server: cfg.values.server,
      log
    })

    log.onLine((line) => sendToAdmin('log:line', line))

    service.on('status', (status) => {
      broadcastStatus()
      refreshTray()
      if (!status.healthy) return
      // 服务端恢复后必须让大屏重新加载，否则页面还停在断线兜底画面上
      if (displaysEnabled) displays.relayout()
      else ensureDisplays()
    })

    createAdminWindow()
    createTray()
    registerIpc()

    // 防熄屏要在服务端起来之前就生效，否则开机后第一段时间屏幕仍会休眠
    powerBlockerId = powerSaveBlocker.start('prevent-display-sleep')
    log.push('console', `防熄屏已启用（powerSaveBlocker=${powerBlockerId}，生效=${powerSaveBlocker.isStarted(powerBlockerId)}）`)

    if (cfg.values.server.autoStart) {
      service.start()
    } else {
      log.push('console', '配置为不自动启动，等待手动启动服务端')
    }

    // 服务端迟迟不健康（例如首次迁移很慢）也要把大屏开出来，别让现场只看到桌面
    const wait = Number(cfg.values.display.waitForServerMs) || 0
    if (wait > 0) {
      displayFallbackTimer = setTimeout(() => {
        displayFallbackTimer = null
        if (!displaysEnabled) {
          log.push('console', `等待服务端就绪超过 ${Math.round(wait / 1000)} 秒，先打开大屏窗口`)
          ensureDisplays()
        }
      }, wait)
    }
  })

  // 常驻托盘：窗口全关也不退出，服务端要继续守着
  app.on('window-all-closed', () => {})

  app.on('before-quit', (event) => {
    quitting = true
    if (shutdownDone) return
    event.preventDefault()

    const finish = () => {
      if (displays) displays.closeAll()
      if (powerBlockerId !== null) powerSaveBlocker.stop(powerBlockerId)
      if (log) log.close()
      shutdownDone = true
      app.quit()
    }

    if (service) {
      service.stop().then(finish).catch(finish)
    } else {
      finish()
    }
  })

  app.on('quit', () => {
    if (service) service.dispose()
  })
}