const express = require('express');
const router = express.Router();
const searchEngine = require('../services/search-engine');
const contentService = require('../services/content');
const { loadSiteConfig } = require('../config');

function getRecommendedSearches() {
  const taxonomy = contentService.getTaxonomy();
  const dbService = require('../services/db');

  const dynamicPills = [];

  // 1. Add categories as discovery pills
  for (const cat of taxonomy.categories) {
    dynamicPills.push({
      label: `category:${cat.name.toLowerCase()}`,
      query: `category:${cat.name.toLowerCase()}`,
      count: cat.count
    });
  }

  // 2. Add top tags as discovery pills
  for (const tag of taxonomy.tags.slice(0, 6)) {
    dynamicPills.push({
      label: `tag:${tag.name.toLowerCase()}`,
      query: `tag:${tag.name.toLowerCase()}`,
      count: tag.count
    });
  }

  // 3. Add genuine trending searches by frequency from search_logs (result_count > 0)
  const trendingDb = dbService.getTopSearchQueries(6);
  const customPills = [];
  for (const item of trendingDb) {
    if (!dynamicPills.some(p => p.query.toLowerCase() === item.query.toLowerCase())) {
      customPills.push({
        label: item.label,
        query: item.query,
        frequency: item.frequency
      });
    }
  }

  return {
    dynamicPills,
    customPills
  };
}

router.get('/search', (req, res) => {
  const query = (req.query.q || '').trim();
  const recommended = getRecommendedSearches();

  let searchData = {
    query: { filters: {}, phrases: [], keywords: [], raw: '' },
    results: [],
    total: 0
  };

  if (query) {
    searchData = searchEngine.search(query);
  }

  res.render('pages/search', {
    title: query ? `Search: ${query}` : 'Search',
    query,
    searchData,
    recommended
  });
});

// JSON API endpoint for client-side search autocomplete / live search
router.get('/api/search', (req, res) => {
  const query = (req.query.q || '').trim();
  if (!query) {
    return res.json({ query: null, results: [], total: 0 });
  }

  const searchData = searchEngine.search(query);
  res.json({
    query: searchData.query,
    total: searchData.total,
    results: searchData.results.map(r => ({
      slug: r.post.slug,
      lang: r.post.lang,
      title: r.post.title,
      date: r.post.date,
      category: r.post.category,
      tags: r.post.tags,
      score: r.score,
      snippet: r.snippet
    }))
  });
});

module.exports = router;