/**
 * 采集引擎入口 - 扫描当前页面
 * 从 docs/extension/plan.md §6.7 移植（组装各模块）
 *
 * 淘宝/天猫优先从 SSR JSON 提取（window.__ICE_APP_CONTEXT__），
 * 提取失败时降级到 DOM 采集。
 */
import { matchProfile } from '../profiles';
import { waitForAny } from './dom';
import { collectImages, type ImageMaterial } from './image';
import { collectTexts, type TextMaterial } from './text';
import { extractSSRData } from './ssr';
import { buildFromSSR } from './ssr-builder';

export type { ImageMaterial, TextMaterial };

export interface ScanResult {
  platform: string;
  itemId: string | null;
  url: string;
  texts: TextMaterial[];
  images: ImageMaterial[];
  scannedAt: number;
  stats: Record<string, number>;  // 分组统计
  warnings: string[];             // 警告（如详情图为 0）
}

export type { ImageMaterial, TextMaterial };

export async function scanCurrentPage(): Promise<ScanResult | null> {
  const profile = matchProfile(location.href);
  if (!profile) {
    console.warn('[Seller Helper] 当前页面不支持采集:', location.href);
    return null;
  }

  console.log('[Seller Helper] 开始采集:', profile.name, location.href);

  // ★ 淘宝/天猫优先从 SSR JSON 提取
  const ssrData = extractSSRData();
  if (ssrData) {
    console.log('[Seller Helper] 使用 SSR 数据（JSON）');
    const result = buildFromSSR(ssrData, profile);
    console.log('[Seller Helper] SSR 采集完成:', {
      texts: result.texts.length,
      images: result.images.length,
      stats: result.stats,
      warnings: result.warnings
    });
    return result;
  }

  // 降级到 DOM 采集
  console.log('[Seller Helper] SSR 数据不可用，降级到 DOM 采集');

  // 等待页面就绪
  const anchor = await waitForAny(profile.readySelectors, profile.readyTimeoutMs ?? 10_000);
  if (!anchor) {
    console.warn('[Seller Helper] 等待页面就绪超时');
    // 不 return，页面可能部分可用，继续尝试
  }

  // 提取文本
  const { materials: texts, missingRequired } = collectTexts(profile);

  // 提取图片
  const images = collectImages(profile);

  // 统计各组数量
  const stats: Record<string, number> = {};
  for (const img of images) {
    stats[img.groupKey] = (stats[img.groupKey] ?? 0) + 1;
  }

  // 生成警告
  const warnings: string[] = [];
  if (missingRequired.length > 0) {
    warnings.push(`缺少必需字段: ${missingRequired.join(', ')}`);
  }
  if (images.length === 0) {
    warnings.push('未扫描到任何图片/视频');
  }
  if (stats.detail === 0) {
    warnings.push('详情图为 0 张，请滚动到页面底部后重新采集');
  }

  console.log('[Seller Helper] 采集完成:', {
    texts: texts.length,
    images: images.length,
    stats,
    warnings
  });

  return {
    platform: profile.id,
    itemId: profile.extractItemId(location.href),
    url: location.href,
    texts,
    images,
    scannedAt: Date.now(),
    stats,
    warnings
  };
}

// 暴露到全局供 side panel 调用
if (typeof window !== 'undefined') {
  (window as any).__SellerHelper = {
    scan: scanCurrentPage
  };
}