import { productMappingSolr } from '@/utils/solrMapping';
import axios from 'axios';
import camelcaseObjectDeep from 'camelcase-object-deep';

// helper untuk escape karakter spesial
const escapeSolrQuery = (query) => {
  if (query == '*') return query;
  query = query.replace(/-/g, ' ');
  const specialChars = /([\+\!\(\)\{\}\[\]\^"~\*\?:\\\/])/g;
  const words = query.split(/\s+/);
  const escapedWords = words.map((word) => {
    if (specialChars.test(word)) {
      return word.replace(specialChars, '\\$1');
    }
    return word;
  });
  return escapedWords.join(' ');
};

export default async function handler(req, res) {
  try {
    const {
      q = '*',
      page = 1,
      brand = '',
      category = '',
      priceFrom = 0,
      priceTo = 0,
      orderBy = '',
      operation = 'AND',
      fq = '',
      limit = 30,
      source = '', // <-- penting
    } = req.query;

    console.log('🔍 API /shop/search → source:', source); // debug biar tahu kebaca atau enggak

    // --- 1️⃣ MODE SITEMAP: ambil semua produk tanpa filter ---
    if (source === 'sitemap') {
      const offset = (page - 1) * limit;
      const parameter = ['q=*:*', `rows=${limit}`, `start=${offset}`];

      const solrUrl =
        process.env.SOLR_HOST + '/solr/product/select?' + parameter.join('&');

      console.log('[SOLR QUERY SITEMAP]', solrUrl);

      const result = await axios(solrUrl);

      result.data.response.products = productMappingSolr(
        result.data.response.docs,
        false
      );
      delete result.data.response.docs;
      result.data = camelcaseObjectDeep(result.data);

      return res.status(200).json(result.data);
    }

    // --- 2️⃣ MODE NORMAL (search biasa di website) ---
    let checkQ = q.trim().split(/[\s\+\-\!\(\)\{\}\[\]\^"~\*\?:\\\/]+/);
    let newQ = escapeSolrQuery(q);

    const formattedQuery = `(${newQ
      .split(' ')
      .map((term) => (term.length < 2 ? term : `${term}*`))
      .join(' ')})`;

    const mm =
      checkQ.length > 2
        ? checkQ.length > 5
          ? '55%'
          : '85%'
        : `${checkQ.length}`;

    // filter default (mode normal)
    const filterQueries = [
      '-publish_b:false',
      'product_rating_f:[8 TO *]',
      'price_tier1_v2_f:[1 TO *]',
    ];
    const fq_ = filterQueries.join(' AND ');

    let keywords = newQ;
    if (checkQ.length >= 3) keywords = formattedQuery;

    let offset = (page - 1) * limit;

    let paramOrderBy = '';
    switch (orderBy) {
      case 'flashsale-discount-desc':
        paramOrderBy += 'flashsale_discount_f DESC';
        break;
      case 'price-asc':
        paramOrderBy += 'price_tier1_v2_f ASC';
        break;
      case 'price-desc':
        paramOrderBy += 'price_tier1_v2_f DESC';
        break;
      case 'popular':
        paramOrderBy += 'product_rating_f DESC, search_rank_i DESC,';
        break;
      case 'popular-weekly':
        paramOrderBy += 'search_rank_weekly_i DESC';
        break;
      case 'stock':
        paramOrderBy += 'product_rating_f DESC, stock_total_f DESC';
        break;
      case 'flashsale-price-asc':
        paramOrderBy += 'flashsale_price_f ASC';
        break;
      default:
        paramOrderBy += '';
        break;
    }

    // parameter query normal
    let parameter = [
      'facet.field={!ex=brand}manufacture_name_s',
      'facet.field={!ex=cat}category_name',
      'facet=true',
      'indent=true',
      `facet.query=${escapeSolrQuery(q)}`,
      `q.op=${operation}`,
      `q=${keywords}`,
      `defType=edismax`,
      'qf=name_s description_clean_t category_name manufacture_name_s variants_code_t variants_name_t category_id_ids default_code_s manufacture_id_i category_id_i',
      `start=${parseInt(offset)}`,
      `rows=${limit}`,
      `sort=${paramOrderBy}`,
      `fq=${encodeURIComponent(fq_)}`,
      `mm=${encodeURIComponent(mm)}`,
    ];

    if (priceFrom > 0 || priceTo > 0) {
      parameter.push(
        `fq=price_tier1_v2_f:[${priceFrom || '*'} TO ${priceTo || '*'}]`
      );
    }

    if (brand) {
      const brandExpr = brand
        .split(',')
        .map(
          (manufacturer) =>
            `manufacture_name:"${encodeURIComponent(manufacturer)}"`
        )
        .join(' OR ');
      parameter.push(`fq={!tag=brand}(${brandExpr})`);
    }

    if (category) {
      const catExpr = category
        .split(',')
        .map((cat) => `category_name:"${encodeURIComponent(cat)}"`)
        .join(' OR ');
      parameter.push(`fq={!tag=cat}(${catExpr})`);
    }

    const solrUrl =
      process.env.SOLR_HOST + '/solr/product/select?' + parameter.join('&');

    console.log('[SOLR QUERY NORMAL]', solrUrl);

    const result = await axios(solrUrl);

    result.data.response.products = productMappingSolr(
      result.data.response.docs,
      false
    );
    delete result.data.response.docs;
    result.data = camelcaseObjectDeep(result.data);

    res.status(200).json(result.data);
  } catch (error) {
    console.error('[ERROR /shop/search]', error.message);
    res.status(400).json({ error: error.message });
  }
}