<?php
/**
 * Search Autocomplete API
 * 
 * GET /api/search_autocomplete.php?q=query
 * 
 * Returns suggestions based on:
 * 1. Video titles
 * 2. Trending search queries
 * 3. Categories
 */

require_once dirname(__DIR__) . '/f_core/config.boot.php';
require_once dirname(__DIR__) . '/f_core/f_classes/class.db.php';

header('Content-Type: application/json');

class AutocompleteAPI {
    private $meili_host;
    private $meili_key;
    private $db;
    
    public function __construct() {
        $this->meili_host = getenv('MEILI_HOST') ?: 'http://meilisearch:7700';
        $this->meili_key = getenv('MEILI_MASTER_KEY') ?: 'changeme_meilisearch_master_key';
        $this->db = new VDatabase();
    }
    
    public function autocomplete() {
        $query = $_GET['q'] ?? '';
        
        if (strlen($query) < 2) {
            return $this->success([]);
        }
        
        $suggestions = [];
        
        // Get video title suggestions from Meilisearch
        $video_suggestions = $this->getVideoSuggestions($query);
        
        // Get trending query suggestions
        $trending_suggestions = $this->getTrendingSuggestions($query);
        
        // Merge and deduplicate
        $suggestions = array_merge($video_suggestions, $trending_suggestions);
        $suggestions = array_unique($suggestions);
        
        // Limit to 10 suggestions
        $suggestions = array_slice($suggestions, 0, 10);
        
        return $this->success($suggestions);
    }
    
    private function getVideoSuggestions($query) {
        $params = [
            'q' => $query,
            'limit' => 5,
            'attributesToRetrieve' => ['title'],
            'filter' => 'privacy = "public"'
        ];
        
        $response = $this->apiRequest('POST', '/indexes/videos/search', $params);
        
        if (!$response || empty($response['hits'])) {
            return [];
        }
        
        return array_map(function($hit) {
            return $hit['title'];
        }, $response['hits']);
    }
    
    private function getTrendingSuggestions($query) {
        $query_escaped = $this->db->escape($query);
        
        $sql = "SELECT query FROM db_search_queries 
                WHERE query LIKE '$query_escaped%' 
                ORDER BY search_count DESC, last_searched DESC 
                LIMIT 5";
        
        $result = $this->db->execute($sql);
        
        if (!$result) {
            return [];
        }
        
        $suggestions = [];
        while ($row = $this->db->fetch($result)) {
            $suggestions[] = $row['query'];
        }
        
        return $suggestions;
    }
    
    private function apiRequest($method, $endpoint, $data = null) {
        $url = $this->meili_host . $endpoint;
        
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Authorization: Bearer ' . $this->meili_key,
            'Content-Type: application/json'
        ]);
        
        if ($data !== null) {
            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
        }
        
        $response = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);
        
        if ($http_code >= 200 && $http_code < 300) {
            return json_decode($response, true);
        }
        
        return null;
    }
    
    private function success($data) {
        echo json_encode([
            'success' => true,
            'suggestions' => $data
        ]);
        exit;
    }
}

$api = new AutocompleteAPI();
$api->autocomplete();