import {
  amazon_product,
  amazon_search_item,
  amazon_review
} from '../models/index.js';
import { safe_json_stringify } from './json_utils.js';

function build_batch_key(prefix) {
  return `${prefix}_${Date.now()}_${Math.random().toString().slice(2, 8)}`;
}

function pick_asin_from_url(url) {
  if (!url) return null;
  const m = String(url).match(/\/dp\/([A-Z0-9]{8,16})/i);
  return m && m[1] ? m[1].toUpperCase() : null;
}

export async function persist_amazon_result(result) {
  if (!result || !result.stage) {
    return;
  }

  if (result.stage === 'detail') {
    const asin = result.asin || pick_asin_from_url(result.url);
    if (!asin) {
      return;
    }

    await amazon_product.upsert({
      asin,
      url: result.url || '',
      title: result.title || null,
      price: result.price || null,
      sku: result.sku || null,
      sku_color: result.sku_color || null,
      sku_size: result.sku_size || null,
      brand_line: result.brand_line || null,
      brand_store_url: result.brand_store_url || null,
      ac_badge: result.ac_badge || null,
      bestseller_hint: result.bestseller_hint || null,
      delivery_hint: result.delivery_hint || null,
      social_proof: result.social_proof || null,
      sustainability_hint: result.sustainability_hint || null,
      rating_stars: result.rating_stars || null,
      review_count_text: result.review_count_text || null,
      main_image: result.main_image || null,
      images_json: safe_json_stringify(result.images || []),
      bullets_json: safe_json_stringify(result.bullets || []),
      product_info_json: safe_json_stringify(result.product_info || {}),
      detail_extra_lines_json: safe_json_stringify(result.detail_extra_lines || [])
    });

    return;
  }

  if (result.stage === 'list') {
    const batch_key = build_batch_key('list');
    const items = Array.isArray(result.items) ? result.items : [];

    for (const it of items) {
      const asin = it.asin || pick_asin_from_url(it.url);
      if (!asin || !it.url) continue;

      await amazon_search_item.create({
        asin,
        url: it.url,
        title: it.title || null,
        price: it.price || null,
        rating: typeof it.rating === 'number' ? it.rating : null,
        rating_text: it.rating_text || null,
        review_count: typeof it.review_count === 'number' ? it.review_count : null,
        review_count_text: it.review_count_text || null,
        rank_index: typeof it.index === 'number' ? it.index : null,
        batch_key,
        batch_total: typeof result.total === 'number' ? result.total : null,
        batch_limit: typeof result.limit === 'number' ? result.limit : null
      });
    }

    return;
  }

  if (result.stage === 'reviews') {
    const batch_key = build_batch_key('reviews');
    const asin = pick_asin_from_url(result.url);
    const items = Array.isArray(result.items) ? result.items : [];

    for (const it of items) {
      const review_id = it.review_id;
      if (!review_id) continue;

      const asin_value = asin || pick_asin_from_url(it.url) || pick_asin_from_url(result.url);

      await amazon_review.upsert({
        asin: asin_value || null,
        url: result.url || '',
        review_id,
        author: it.author || null,
        title: it.title || null,
        body: it.body || null,
        rating_text: it.rating_text || null,
        review_date: it.date || null,
        review_index: typeof it.index === 'number' ? it.index : null,
        batch_key,
        batch_total: typeof result.total === 'number' ? result.total : null,
        batch_limit: typeof result.limit === 'number' ? result.limit : null
      });
    }
  }
}