/**
 * fun 标签：img-center-point-location
 * 图像匹配：识别模板图片在截图中的位置，返回中心点坐标
 */

const path = require('path')
const fs = require('fs')
const os = require('os')
const { spawnSync } = 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 imageMatchScriptPath = path.join(projectRoot, 'python', 'scripts', 'image-match.py')

const tagName = 'img-center-point-location'

const schema = {
  description: '在屏幕截图中查找模板图片的位置并返回中心点坐标（可用于定位/点击）。',
  inputs: { template: '模板图片路径（相对于工作流目录）', variable: '输出变量名（保存中心点坐标）' },
  outputs: { variable: '中心点坐标（JSON 字符串格式，如：{"x":123,"y":456}）' },
}

/** 解析 Python 可执行路径（与 config 中 pythonPath / pythonVenvPath 一致） */
function getPythonPath() {
  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'
}

/** 在设备截图中匹配模板，返回坐标与中心点 */
function matchImageAndGetCoordinate(device, imagePath) {
  if (!imagePath || typeof imagePath !== 'string') return { success: false, error: '模板路径为空' }
  const templatePath = path.isAbsolute(imagePath) ? imagePath : path.resolve(projectRoot, imagePath)
  const ts = Date.now()
  const screenshotPath = path.join(os.tmpdir(), `ef-screenshot-${ts}.png`)
  const templateCopyPath = path.join(os.tmpdir(), `ef-template-${ts}.png`)
  fs.copyFileSync(templatePath, templateCopyPath)

  const pythonPath = getPythonPath()
  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 r = spawnSync(pythonPath, [imageMatchScriptPath, '--adb', adbPath, '--device', device, '--screenshot', screenshotPath.replace(/\\/g, '/'), '--template', templateCopyPath.replace(/\\/g, '/'), '--method', 'feature'], {
    encoding: 'utf-8',
    timeout: 20000,
    env: { ...process.env, PYTHONIOENCODING: 'utf-8' },
    cwd: projectRoot
  })
  try { fs.unlinkSync(screenshotPath) } catch (_) {}
  try { fs.unlinkSync(templateCopyPath) } catch (_) {}

  if (r.status !== 0) return { success: false, error: (r.stderr || r.stdout || '').trim() || '图像匹配失败' }
  const out = JSON.parse(r.stdout.trim())
  if (!out.success) return { success: false, error: out.error || '未找到图片' }
  return {
    success: true,
    coordinate: { x: out.x, y: out.y, width: out.width, height: out.height },
    clickPosition: { x: out.center_x, y: out.center_y }
  }
}

async function executeImgCenterPointLocation({ device, template, folderPath }) {
  if (!device) return { success: false, error: '缺少设备 ID，无法自动获取截图' }
  if (!template || typeof template !== 'string') return { success: false, error: '缺少模板图片路径' }
  const baseDir = folderPath && typeof folderPath === 'string' ? folderPath : projectRoot
  const templatePath = template.startsWith('/') || template.includes(':') ? template : path.join(baseDir, 'resources', template)
  const result = matchImageAndGetCoordinate(device, templatePath)
  if (!result.success) return { success: false, error: result.error }
  const center = result.clickPosition || { x: result.coordinate.x + result.coordinate.width / 2, y: result.coordinate.y + result.coordinate.height / 2 }
  return { success: true, center, coordinate: result.coordinate }
}

module.exports = { tagName, schema, executeImgCenterPointLocation, matchImageAndGetCoordinate }