/**
 * adb method: input — 通过 ADB Keyboard 输入文本（先安装 static/ADBKeyboard.apk，切换 IME，发送后切回原输入法）
 */
const path = require('path')
const fs = require('fs')
const { execSync, spawnSync } = require('child_process')

const ADB_KEYBOARD_IME_ID = 'com.android.adbkeyboard/.AdbKeyboard'
const ADB_KEYBOARD_PACKAGE = 'com.android.adbkeyboard'
const B64_CHUNK_CHARS = 200

function getProjectRoot(ctx) {
  const root = ctx.compilerConfig?.projectRoot
  if (root && fs.existsSync(root)) return root
  // 本文件在 .../nodejs/ef-compiler/actions/fun/adb：上溯 **5** 层才到仓库根（4 层只会停在 nodejs/）
  return path.resolve(__dirname, '..', '..', '..', '..', '..')
}

function getAdbPath(projectRoot) {
  try {
    const configPath = process.env.STATIC_ROOT
      ? path.join(path.dirname(path.resolve(process.env.STATIC_ROOT)), 'config.js')
      : path.join(projectRoot, 'config.js')
    const config = fs.existsSync(configPath) ? require(configPath) : {}
    const cfgRoot =
      (config.projectRoot && fs.existsSync(config.projectRoot)) ? config.projectRoot : projectRoot
    const p = config.adbPath?.path
    if (p) return path.isAbsolute(p) ? p : path.resolve(cfgRoot, p)
  } catch (e) {}
  return path.join(projectRoot, 'lib', 'scrcpy-adb', process.platform === 'win32' ? 'adb.exe' : 'adb')
}

function getAdbKeyboardApkPath(projectRoot) {
  const p = path.join(projectRoot, 'static', 'ADBKeyboard.apk')
  return fs.existsSync(p) ? p : null
}

function deviceArgs(device) {
  return device && String(device).includes(':') ? ['-s', device] : []
}

function runShell(adbPath, device, shellArgs, timeout = 3000) {
  const args = [...deviceArgs(device), 'shell', shellArgs]
  const r = spawnSync(adbPath, args, { encoding: 'utf-8', timeout })
  if (r.status !== 0) throw new Error(r.stderr || r.stdout || `adb shell failed: ${r.status}`)
  return (r.stdout || '').trim()
}

function runShellQuiet(adbPath, device, shellArgs, timeout = 3000) {
  const args = [...deviceArgs(device), 'shell', shellArgs]
  const r = spawnSync(adbPath, args, { encoding: 'utf-8', timeout })
  return r.status === 0
}

function isPackageInstalled(adbPath, device, packageId) {
  try {
    const out = runShell(adbPath, device, `pm list packages ${packageId}`, 3000)
    return (out || '').indexOf('package:' + packageId) >= 0
  } catch (e) {
    return false
  }
}

function installApk(adbPath, device, apkPath) {
  const args = [...deviceArgs(device), 'install', '-r', apkPath]
  const r = spawnSync(adbPath, args, { encoding: 'utf-8', timeout: 60000 })
  if (r.status !== 0) throw new Error(r.stderr || r.stdout || `adb install failed: ${r.status}`)
}

function getCurrentIme(adbPath, device) {
  try {
    return runShell(adbPath, device, 'settings get secure default_input_method', 3000)
  } catch (e) {
    return ''
  }
}

function listEnabledImes(adbPath, device) {
  try {
    const out = runShell(adbPath, device, 'ime list -s', 3000)
    return (out || '').split(/\r?\n/).map(s => s.trim()).filter(Boolean)
  } catch (e) {
    return []
  }
}

function listAllImes(adbPath, device) {
  try {
    const out = runShell(adbPath, device, 'ime list -a', 3000)
    return (out || '').split(/\r?\n/).map(s => s.trim()).filter(Boolean)
  } catch (e) {
    return []
  }
}

/** 从 ime list -a 输出解析 IME id 列表（行格式多为 "com.pkg/.Class:"） */
function parseImeIdsFromListA(out) {
  const ids = []
  const lines = (out || '').split(/\r?\n/)
  for (const line of lines) {
    const t = line.trim()
    if (t.includes('/') && (t.endsWith(':') || !t.includes(' '))) {
      ids.push(t.replace(/:$/, ''))
    }
  }
  return ids
}

function findAdbKeyboardImeId(adbPath, device) {
  try {
    const out = runShell(adbPath, device, 'ime list -a', 3000)
    const ids = parseImeIdsFromListA(out)
    const lower = s => String(s).toLowerCase()
    const found = ids.find(id => lower(id).includes('adbkeyboard') || lower(id).includes('adb.keyboard'))
    return found || ADB_KEYBOARD_IME_ID
  } catch (e) {
    return ADB_KEYBOARD_IME_ID
  }
}

/** 从 dumpsys package 解析包内 BroadcastReceiver 组件名，用于 -n 显式发送 */
function getPackageReceivers(adbPath, device, packageId) {
  try {
    const out = runShell(adbPath, device, `dumpsys package ${packageId}`, 8000)
    const receivers = []
    const re = /ComponentInfo\{([^}]+)\}/g
    let m
    while ((m = re.exec(out)) !== null) {
      const comp = m[1].trim()
      if (comp.startsWith(packageId + '/')) receivers.push(comp)
    }
    return [...new Set(receivers)]
  } catch (e) {
    return []
  }
}

function enableIme(adbPath, device, imeId) {
  if (!imeId) return
  const args = [...deviceArgs(device), 'shell', 'ime', 'enable', imeId]
  const r = spawnSync(adbPath, args, { encoding: 'utf-8', timeout: 5000 })
  if (r.status !== 0 && r.stderr) {
    throw new Error(`ime enable 失败: ${(r.stderr || r.stdout || '').trim() || r.status}`)
  }
}

function setIme(adbPath, device, imeId) {
  if (!imeId) return
  const args = [...deviceArgs(device), 'shell', 'ime', 'set', imeId]
  const r = spawnSync(adbPath, args, { encoding: 'utf-8', timeout: 5000 })
  if (r.status !== 0) {
    throw new Error(`ime set 失败: ${(r.stderr || r.stdout || '').trim() || r.status}`)
  }
}

function ensureAdbKeyboardInstalled(adbPath, device, projectRoot) {
  const apkPath = getAdbKeyboardApkPath(projectRoot)
  if (!apkPath) throw new Error('未找到 static/ADBKeyboard.apk，请将 ADB Keyboard 的 apk 放在该路径')
  if (!isPackageInstalled(adbPath, device, ADB_KEYBOARD_PACKAGE)) installApk(adbPath, device, apkPath)
}

/** 单次 broadcast（--es 字符串），返回是否成功 */
function tryBroadcast(adbPath, device, action, key, value, component) {
  const args = [...deviceArgs(device), 'shell', 'am', 'broadcast', '-a', action, '--es', key, value]
  if (component) args.splice(args.indexOf(action) + 1, 0, '-n', component)
  const r = spawnSync(adbPath, args, { encoding: 'utf-8', timeout: 15000 })
  return r.status === 0
}

/** ADB_INPUT_CHARS：--eia chars 码点1 码点2 ...（部分设备 B64 异常时可用） */
function tryBroadcastChars(adbPath, device, codePoints, component) {
  const args = [...deviceArgs(device), 'shell', 'am', 'broadcast', '-a', 'ADB_INPUT_CHARS', '--eia', 'chars', ...codePoints.map(String)]
  if (component) args.splice(args.indexOf('ADB_INPUT_CHARS') + 1, 0, '-n', component)
  const r = spawnSync(adbPath, args, { encoding: 'utf-8', timeout: 15000 })
  return r.status === 0
}

/** 依次尝试多种方式发送，直到一种成功。先试隐式（系统派发到注册的 Receiver），再试 -n */
async function sendTextViaBroadcast(adbPath, device, str, adbKeyboardImeId, logMessage, folderPath) {
  const fromDumpsys = getPackageReceivers(adbPath, device, ADB_KEYBOARD_PACKAGE)
  const components = [
    null,
    adbKeyboardImeId,
    ...fromDumpsys,
    `${ADB_KEYBOARD_PACKAGE}/.AdbReceiver`,
    `${ADB_KEYBOARD_PACKAGE}/.Receiver`
  ]
  const dedup = [...new Set(components)]
  for (let i = 0; i < str.length; i += B64_CHUNK_CHARS) {
    const chunk = str.slice(i, i + B64_CHUNK_CHARS)
    const b64 = Buffer.from(chunk, 'utf8').toString('base64')
    let sent = false
    let used = null
    for (const comp of dedup) {
      if (tryBroadcast(adbPath, device, 'ADB_INPUT_B64', 'msg', b64, comp)) {
        sent = true
        used = comp ? comp : 'B64隐式'
        break
      }
    }
    if (!sent && chunk.length <= 100) {
      const codePoints = [...chunk].map(c => c.codePointAt(0))
      for (const comp of [adbKeyboardImeId, null]) {
        if (tryBroadcastChars(adbPath, device, codePoints, comp)) {
          sent = true
          used = 'ADB_INPUT_CHARS'
          break
        }
      }
    }
    if (!sent && tryBroadcast(adbPath, device, 'ADB_INPUT_TEXT', 'msg', chunk, null)) {
      sent = true
      used = 'ADB_INPUT_TEXT'
    }
    if (!sent) throw new Error('broadcast 所有方式均失败')
    if (i + B64_CHUNK_CHARS < str.length) await new Promise(r => setTimeout(r, 150))
  }
}

async function run(action, ctx) {
  const { device, folderPath, variableContext, api, extractVarName, resolveValue } = ctx
  let inputValue = null
  const inVars = action.inVars || []
  if (inVars.length > 0) {
    const raw = inVars[0]
    if (raw != null && typeof raw === 'string' && !(raw.startsWith('{') && raw.endsWith('}'))) {
      inputValue = raw
    } else {
      inputValue = variableContext[extractVarName(raw)]
    }
  }
  if (!inputValue && action.value) inputValue = resolveValue(action.value, variableContext)
  if (!inputValue) return { success: false, error: 'input 操作缺少输入内容' }

  if (action.clear) {
    if (!api?.sendKeyEvent) return { success: false, error: '清空需要 sendKeyEvent API' }
    for (let i = 0; i < 200; i++) {
      const clearResult = await api.sendKeyEvent(device, '67')
      if (!clearResult.success) break
      await new Promise((r) => setTimeout(r, 10))
    }
    await new Promise((r) => setTimeout(r, 200))
  }

  const projectRoot = getProjectRoot(ctx)
  const adbPath = getAdbPath(projectRoot)
  if (!fs.existsSync(adbPath)) return { success: false, error: `未找到 adb: ${adbPath}` }

  const logMessage = ctx.logMessage
  const needInstall = !isPackageInstalled(adbPath, device, ADB_KEYBOARD_PACKAGE)
  if (needInstall) {
    ensureAdbKeyboardInstalled(adbPath, device, projectRoot)
  }

  const adbKeyboardImeId = findAdbKeyboardImeId(adbPath, device)

  try {
    const prevIme = getCurrentIme(adbPath, device)
    try {
      try {
        enableIme(adbPath, device, adbKeyboardImeId)
      } catch (enableErr) {}
      await new Promise(r => setTimeout(r, 400))
      try {
        const sizeOut = runShell(adbPath, device, 'wm size', 3000)
        const m = (sizeOut || '').match(/(\d+)x(\d+)/)
        if (m) {
          const w = parseInt(m[1], 10)
          const h = parseInt(m[2], 10)
          const tapX = Math.floor(w / 2)
          const tapY = Math.floor(h * 0.28)
          runShellQuiet(adbPath, device, `input tap ${tapX} ${tapY}`, 2000)
          await new Promise(r => setTimeout(r, 500))
        }
      } catch (e) {}
      setIme(adbPath, device, adbKeyboardImeId)
      await new Promise(r => setTimeout(r, 1000))
      await sendTextViaBroadcast(adbPath, device, String(inputValue), adbKeyboardImeId, logMessage, folderPath)
      await new Promise(r => setTimeout(r, 1000))
    } finally {
      if (prevIme && prevIme !== adbKeyboardImeId) {
        setIme(adbPath, device, prevIme)
      } else {
        const enabled = listEnabledImes(adbPath, device)
        const other = enabled.find(id => id !== adbKeyboardImeId)
        if (other) setIme(adbPath, device, other)
      }
    }
  } catch (e) {
    const msg = e && (e.message || String(e)) || 'unknown'
    return { success: false, error: `输入失败: ${msg}` }
  }
  return { success: true }
}

module.exports = { run }