/**
 * fun 标签：img-cropping
 * 根据区域坐标裁剪截图指定区域并保存
 */

const path = require('path')
const fs = require('fs')
const { spawnSync } = require('child_process')
const { captureScreenshot } = require('../../../adb/adb-screencap.js')

const tagName = 'img-cropping'
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 imgCropScriptPath = path.join(projectRoot, 'python', 'scripts', 'img-crop.py')

/** 解析 area 为 { x, y, width, height } */
function parseAreaToRect(area) {
  const obj = typeof area === 'string' ? JSON.parse(area) : area
  if (obj.topLeft && obj.bottomRight) {
    return {
      x: parseInt(obj.topLeft.x, 10),
      y: parseInt(obj.topLeft.y, 10),
      width: parseInt(obj.bottomRight.x - obj.topLeft.x, 10),
      height: parseInt(obj.bottomRight.y - obj.topLeft.y, 10),
    }
  }
  if (obj.topLeft && obj.topRight && obj.bottomLeft && obj.bottomRight) {
    return {
      x: parseInt(obj.topLeft.x, 10),
      y: parseInt(obj.topLeft.y, 10),
      width: parseInt(obj.bottomRight.x - obj.topLeft.x, 10),
      height: parseInt(obj.bottomRight.y - obj.topLeft.y, 10),
    }
  }
  if (obj.x != null && obj.y != null && obj.width != null && obj.height != null) {
    return {
      x: parseInt(obj.x, 10),
      y: parseInt(obj.y, 10),
      width: parseInt(obj.width, 10),
      height: parseInt(obj.height, 10),
    }
  }
  return null
}

/** 构建截图路径 */
function buildScreenshotPath(folderPath) {
  return path.join(folderPath, 'history', 'ScreenShot.png')
}

/** 构建保存路径 */
function buildSavePath(savePath, folderPath) {
  return savePath.includes(':') ? savePath : path.join(folderPath, savePath)
}

/** 解析 Python 可执行路径（与 config 中 pythonPath / pythonVenvPath 一致） */
function getPythonExe() {
  const base = config.pythonPath?.path || config.pythonVenvPath || path.join(projectRoot, 'python', process.arch === 'arm64' ? 'arm64' : 'x64')
  const envPy = path.join(base, 'env', 'Scripts', 'python.exe')
  const scriptsPy = path.join(base, 'Scripts', 'python.exe')
  const pyEmbedded = path.join(base, 'py', 'python.exe')
  if (fs.existsSync(envPy)) return envPy
  if (fs.existsSync(scriptsPy)) return scriptsPy
  if (fs.existsSync(pyEmbedded)) return pyEmbedded
  return 'python'
}

/** 调用 Python 裁剪图片并保存 */
function cropAndSaveImage(inputPath, outputPath, x, y, width, height) {
  const pythonExe = getPythonExe()
  const r = spawnSync(pythonExe, [imgCropScriptPath, inputPath, outputPath, String(x), String(y), String(width), String(height)], {
    encoding: 'utf-8',
    timeout: 10000,
    cwd: projectRoot
  })
  if (r.status !== 0) {
    return { success: false, error: (r.stderr || r.stdout || '').trim() || '裁剪失败' }
  }
  return { success: true }
}

/** 执行 img-cropping */
async function executeImgCropping({ area, savePath, folderPath, device }) {
  const rect = parseAreaToRect(area)
  if (!rect || rect.width <= 0 || rect.height <= 0) {
    return { success: false, error: '区域坐标格式不正确' }
  }

  const screenshotPath = buildScreenshotPath(folderPath)
  const outputPath = buildSavePath(savePath, folderPath)

  if (device) {
    const cap = captureScreenshot(device, screenshotPath)
    if (!cap.success) return { success: false, error: cap.error }
  }

  const crop = cropAndSaveImage(screenshotPath, outputPath, rect.x, rect.y, rect.width, rect.height)
  if (!crop.success) return { success: false, error: crop.error }

  return { success: true }
}

module.exports = { tagName, executeImgCropping, cropAndSaveImage }