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

export default async function handler(req, res) {
  const {
    q = '*',
    page = 1,
    brand = '',
    category = '',
    priceFrom = 0,
    priceTo = 0,
    orderBy = '',
    operation = 'AND',
    fq = '', // bisa berupa string atau array
    limit = 30,
    source = '',
  } = req.query;

  let { stock = '' } = req.query;

  // ============================================================
  // LOGIC KHUSUS UPSELL (Simple & Direct)
  // ============================================================
  if (source === 'upsell') {
    try {
      // Ambil fq dari query (format: product_id_i:(...))
      // Pastikan fq adalah string tunggal
      let fqUpsell = Array.isArray(fq) ? fq.join(' OR ') : fq;
      fqUpsell = decodeURIComponent(fqUpsell);

      const parameter = [
        'q=*:*',
        `rows=${limit}`,
        'wt=json',
        'indent=true',
        'defType=edismax',
        // Filter Query khusus Upsell
        `fq=${encodeURIComponent(fqUpsell)}`,
        // Tetap filter yang publish & ada harga agar produk valid
        `fq=${encodeURIComponent('-publish_b:false')}`, 
        `fq=${encodeURIComponent('price_tier1_v2_f:[1 TO *]')}`
      ];

      // PENTING: SEARCH DI CORE 'VARIANTS'
      const solrUrl = process.env.SOLR_HOST + '/solr/variants/select?' + parameter.join('&');

      const result = await axios(solrUrl);

      // 1. Mapping dasar
      const mappedProducts = productMappingSolr(
        result.data.response.docs,
        false
      );

      // 2. FIX URL LINK: Override ID Varian dengan Template ID
      const rawDocs = result.data.response.docs;
      
      const fixedProducts = mappedProducts.map((p, index) => {
          const raw = rawDocs[index];
          if (raw && raw.template_id_i) {
              return {
                  ...p,
                  id: raw.template_id_i, // Ganti ID Varian jadi ID Template agar link valid
                  variantId: raw.product_id_i 
              };
          }
          return p;
      });

      const finalResponse = {
          ...result.data,
          response: {
              ...result.data.response,
              products: fixedProducts
          }
      };

      delete finalResponse.response.docs;
      const camelCasedData = camelcaseObjectDeep(finalResponse);

      return res.status(200).json(camelCasedData);

    } catch (e) {
      console.error('[UPSELL ERROR]', e.response?.data || e.message);
      return res.status(200).json({ response: { products: [], numFound: 0 } });
    }
  }

  // ============================================================
  // SITEMAP (Biarkan tetap sama)
  // ============================================================
  if (source === 'sitemap') {
    try {
      const offset = (page - 1) * limit;
      const parameter = [
        'q=*:*',
        `rows=${limit}`,
        `start=${offset}`,
        'fl=product_id_i,name_s,default_code_s,image_s,category_name',
        'wt=json',
        'omitHeader=true',
      ];
      const solrUrl = process.env.SOLR_HOST + '/solr/product/select?' + parameter.join('&');
      const result = await axios(solrUrl, { timeout: 25000 });
      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);
    } catch (e) {
      return res.status(500).json({ error: 'Sitemap query failed' });
    }
  }

  // ============================================================
  // SEARCH NORMAL (LOGIKA LAMA)
  // ============================================================

  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;
  }

  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}`;

  const filterQueries = [
    '-publish_b:false',
    'product_rating_f:[8 TO *]',
    'price_tier1_v2_f:[1 TO *]',
  ];

  if (orderBy === 'stock') filterQueries.push('stock_total_f:[1 TO *]');

  // Handle 'fq' parameter from request
  let finalFq = [...filterQueries];
  if (fq) {
      if (Array.isArray(fq)) finalFq.push(...fq);
      else finalFq.push(fq);
  }

  let keywords = newQ;
  if (source === 'similar' || checkQ.length < 3) {
    if (checkQ.length < 2 || checkQ[1].length < 2) keywords = newQ;
    else keywords = newQ + '*';
  } else {
    keywords = formattedQuery;
  }

  let offset = (page - 1) * limit;

  let parameter = [
    'facet.field={!ex=brand}manufacture_name_s',
    'facet.field={!ex=cat}category_name',
    'facet=true',
    'indent=true',
    `facet.query=${escapeSolrQuery(q)}`,
    `q.op=OR`,
    `q=${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=${paramOrderBy}`,
    `mm=${encodeURIComponent(mm)}`,
  ];

  // Masukkan semua Filter Query (fq)
  finalFq.forEach(f => {
      parameter.push(`fq=${encodeURIComponent(f)}`);
  });

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

  let { auth } = req.cookies;
  if (auth) {
    auth = JSON.parse(auth);
    if (auth.feature.onlyReadyStock) stock = true;
  }

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

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

  if (stock) parameter.push(`fq=stock_total_f:(1 TO *)`);

  // SEARCH NORMAL: DEFAULT KE CORE 'PRODUCT'
  const solrUrl = process.env.SOLR_HOST + '/solr/product/select?' + parameter.join('&');

  try {
    const result = await axios(solrUrl);
    result.data.response.products = productMappingSolr(
      result.data.response.docs,
      auth?.pricelist || false
    );
    result.data.responseHeader.params.start = parseInt(result.data.responseHeader.params.start);
    result.data.responseHeader.params.rows = parseInt(result.data.responseHeader.params.rows);
    delete result.data.response.docs;
    result.data = camelcaseObjectDeep(result.data);
    res.status(200).json(result.data);
  } catch (error) {
    res.status(400).json({ error: error.message });
  }
}

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