#!/usr/bin/env node
/**
 * 模拟系统按键：home、返回
 * 用法：node adb-sys-btn.js <home|back> [deviceId]
 * 或：  node adb-sys-btn.js <3|4> [deviceId]  （3=Home 4=Back）
 * 也可被 require 后调用：sendSystemButton(button, deviceId) => { success, error }
 */

const path = require('path')
const fs = require('fs')
const { execSync } = require('child_process')

const configPath = process.env.STATIC_ROOT
  ? path.join(path.dirname(process.env.STATIC_ROOT), 'configs', 'config.js')
  : path.join(__dirname, '..', '..', 'configs', 'config.js')
const projectRoot = path.dirname(path.dirname(path.resolve(configPath)))
const config = fs.existsSync(configPath) ? require(configPath) : {}
const adbPath = config.adbPath?.path
  ? (path.isAbsolute(config.adbPath.path) ? config.adbPath.path : path.resolve(projectRoot, config.adbPath.path))
  : path.join(projectRoot, 'lib', 'scrcpy-adb', process.platform === 'win32' ? 'adb.exe' : 'adb')

const keycodeMap = {
  home: '3',
  back: '4',
  '3': '3',
  '4': '4',
}

/**
 * 发送系统按键（可被 ef-compiler 等 require 调用）
 * @param {string} button - 'home' | 'back' | '3' | '4'
 * @param {string} [deviceId] - 设备 ID，如 192.168.2.5:5555
 * @returns {{ success: boolean, error?: string }}
 */
function sendSystemButton(button, deviceId = '') {
  const keyCode = keycodeMap[String(button).toLowerCase()]
  if (!keyCode) {
    return { success: false, error: `不支持的按键: ${button}，支持 home/back/3/4` }
  }
  const deviceFlag = deviceId && String(deviceId).includes(':') ? `-s ${deviceId} ` : ''
  const quoted = adbPath.includes(' ') ? `"${adbPath}"` : adbPath
  try {
    execSync(`${quoted} ${deviceFlag}shell input keyevent ${keyCode}`, { encoding: 'utf-8', timeout: 3000 })
    return { success: true }
  } catch (e) {
    return { success: false, error: e.message || String(e) }
  }
}

// CLI 入口
if (require.main === module) {
  const button = (process.argv[2] || '').toLowerCase()
  const deviceId = process.argv[3] || ''
  const keyCode = keycodeMap[button]
  if (!keyCode) {
    process.stderr.write('用法: node adb-sys-btn.js <home|back> [deviceId]\n')
    process.exit(1)
  }
  const result = sendSystemButton(button, deviceId)
  if (!result.success) {
    process.stderr.write(result.error || '未知错误')
    process.exit(1)
  }
  process.exit(0)
}

module.exports = { sendSystemButton }