/**
 * fun 标签：img-bounding-box-location
 *
 * 在完整截图中查找区域截图的位置，返回区域包围框的四个顶点坐标。
 */

function matchImageRegionLocation() {
  return { success: false, error: 'matchImageRegionLocation 需在主进程实现' }
}

const tagName = 'img-bounding-box-location'

const schema = {
  description: '在完整截图中查找区域截图的位置，返回区域的四个顶点坐标（左上、右上、左下、右下）。',
  inputs: {
    screenshot: '完整截图路径（相对于工作流目录）',
    region: '区域截图路径（相对于工作流目录）',
    variable: '输出变量名（保存四个顶点坐标）',
  },
  outputs: {
    variable: '四个顶点坐标对象 {topLeft: {x, y}, topRight: {x, y}, bottomLeft: {x, y}, bottomRight: {x, y}}',
  },
};

/**
 * 执行 img-bounding-box-location 功能
 */
async function executeImgBoundingBoxLocation({ device, screenshot, region, folderPath }) {
  let screenshotPath = screenshot;
  if (screenshot === null) {
    screenshotPath = '__AUTO_SCREENSHOT__';
  } else if (screenshot) {
    screenshotPath = screenshot.startsWith('/') || screenshot.includes(':')
      ? screenshot
      : `${folderPath}/resources/${screenshot}`;
  }

  const regionPath = region.startsWith('/') || region.includes(':')
    ? region
    : `${folderPath}/resources/${region}`;

  const result = matchImageRegionLocation(screenshotPath, regionPath, device);

  if (!result.success) {
    return { success: false, error: result.error };
  }

  const { x, y, width, height } = result;
  const corners = {
    topLeft: { x, y },
    topRight: { x: x + width, y },
    bottomLeft: { x, y: y + height },
    bottomRight: { x: x + width, y: y + height },
  };

  return {
    success: true,
    corners,
    bounds: { x, y, width, height },
  };
}

module.exports = { tagName, schema, executeImgBoundingBoxLocation };