<?php
/**
 * 热门统计接口
 * 今日热门、本月热门、累计热门
 * 浏览量、点赞、推荐排行
 * 
 * 性能优化：支持文件缓存，减少数据库查询
 */

$startTime = microtime(true);

define('ZBP_HOOKERROR', false);
require '../zb_system/function/c_system_base.php';
$zbp->Load();

require_once 'cache.php';

header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Cache-Control: public, max-age=300');

$act = strtolower(trim($_GET['act'] ?? 'hot'));

$forceRefresh = isset($_GET['_refresh']) && $_GET['_refresh'] === '1';
$staleMode = isset($_GET['_stale']) && $_GET['_stale'] === '1';

$cacheKey = 'hot_' . $act;
$cacheParams = array('act' => $act);

if (!$forceRefresh) {
    $cachedResult = ApiCache::get('hot', $cacheParams);
    if ($cachedResult !== null) {
        header('X-Cache: HIT');
        $cachedResult['_cached'] = true;
        $cachedResult['_cache_age'] = ApiCache::getCacheAge('hot', $cacheParams);
        $cachedResult['_query_time'] = round((microtime(true) - $startTime) * 1000, 2) . 'ms';
        echo json_encode($cachedResult, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        exit;
    }
    
    if ($staleMode || isset($_SERVER['HTTP_X_STALE_CACHE'])) {
        $staleResult = ApiCache::getStale('hot', $cacheParams);
        if ($staleResult !== null) {
            header('X-Cache: STALE');
            $staleResult['_cached'] = true;
            $staleResult['_stale'] = true;
            $staleResult['_cache_age'] = ApiCache::getCacheAge('hot', $cacheParams);
            $staleResult['_query_time'] = round((microtime(true) - $startTime) * 1000, 2) . 'ms';
            echo json_encode($staleResult, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
            exit;
        }
    }
}

header('X-Cache: MISS');

$result = array();

switch ($act) {
    case 'hot':
    case 'index':
        $result = get_hot_stats();
        break;
    case 'today':
        $result = get_today_hot();
        break;
    case 'month':
        $result = get_month_hot();
        break;
    case 'total':
        $result = get_total_hot();
        break;
    default:
        $result = get_hot_stats();
        break;
}

ApiCache::set('hot', $cacheParams, $result);

$result['_query_time'] = round((microtime(true) - $startTime) * 1000, 2) . 'ms';

echo json_encode($result, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
exit;

/**
 * 获取全部热门统计
 */
function get_hot_stats() {
    $todayData = get_hot_data('today');
    $monthData = get_hot_data('month');
    $totalData = get_hot_data('total');
    
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => array(
            'today' => $todayData,
            'month' => $monthData,
            'total' => $totalData
        )
    );
}

/**
 * 获取今日热门
 */
function get_today_hot() {
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => get_hot_data('today')
    );
}

/**
 * 获取本月热门
 */
function get_month_hot() {
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => get_hot_data('month')
    );
}

/**
 * 获取累计热门
 */
function get_total_hot() {
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => get_hot_data('total')
    );
}

/**
 * 获取热门数据
 * @param string $period 时间范围: today, month, total
 */
function get_hot_data($period) {
    global $zbp;
    
    $data = array();
    
    $data['recipe_view'] = get_top_by_field('recipe', 'view', 20, $period);
    $data['recipe_like'] = get_top_by_field('recipe', 'like', 20, $period);
    $data['recipe_recommend'] = get_top_by_field('recipe', 'recommend', 20, $period);
    
    $data['ingredient_view'] = get_top_by_field('ingredient', 'view', 10, $period);
    $data['ingredient_like'] = get_top_by_field('ingredient', 'like', 10, $period);
    $data['ingredient_recommend'] = get_top_by_field('ingredient', 'recommend', 10, $period);
    
    return $data;
}

/**
 * 按字段获取排行
 * @param string $type 类型: recipe, ingredient
 * @param string $field 字段: view, like, recommend
 * @param int $limit 限制数量
 * @param string $period 时间范围: today, month, total
 */
function get_top_by_field($type, $field, $limit = 20, $period = 'total') {
    global $zbp;
    
    $list = array();
    
    if ($period === 'total') {
        $list = get_total_top($type, $field, $limit);
    } elseif ($period === 'today') {
        $list = get_today_top($type, $field, $limit);
    } elseif ($period === 'month') {
        $list = get_month_top($type, $field, $limit);
    }
    
    return $list;
}

/**
 * 获取累计排行
 */
function get_total_top($type, $field, $limit) {
    global $zbp;
    
    $list = array();
    
    if ($type === 'recipe') {
        $table = $zbp->db->dbpre . 'post';
        $statTable = $zbp->db->dbpre . 'post_stat';
        
        if ($field === 'view') {
            $sql = "SELECT p.log_ID as id, p.log_Title as name, p.log_ViewNums as count
                    FROM $table p
                    WHERE p.log_Type = 0 AND p.log_Status = 0
                    ORDER BY p.log_ViewNums DESC
                    LIMIT $limit";
        } elseif ($field === 'like') {
            $sql = "SELECT p.log_ID as id, p.log_Title as name, COALESCE(s.like_nums, 0) as count
                    FROM $table p
                    LEFT JOIN $statTable s ON p.log_ID = s.log_id
                    WHERE p.log_Type = 0 AND p.log_Status = 0
                    ORDER BY count DESC
                    LIMIT $limit";
        } elseif ($field === 'recommend') {
            $sql = "SELECT p.log_ID as id, p.log_Title as name, COALESCE(s.recommend_nums, 0) as count
                    FROM $table p
                    LEFT JOIN $statTable s ON p.log_ID = s.log_id
                    WHERE p.log_Type = 0 AND p.log_Status = 0
                    ORDER BY count DESC
                    LIMIT $limit";
        }
    } else {
        $table = $zbp->db->dbpre . 'ingredient_detail';
        $statTable = $zbp->db->dbpre . 'ingredient_stat';
        
        if ($field === 'view') {
            $sql = "SELECT i.ingredient_id as id, i.name, i.view_count as count
                    FROM $table i
                    ORDER BY i.view_count DESC
                    LIMIT $limit";
        } elseif ($field === 'like') {
            $sql = "SELECT i.ingredient_id as id, i.name, COALESCE(s.like_nums, 0) as count
                    FROM $table i
                    LEFT JOIN $statTable s ON i.ingredient_id = s.ingredient_id
                    ORDER BY count DESC
                    LIMIT $limit";
        } elseif ($field === 'recommend') {
            $sql = "SELECT i.ingredient_id as id, i.name, COALESCE(s.recommend_nums, 0) as count
                    FROM $table i
                    LEFT JOIN $statTable s ON i.ingredient_id = s.ingredient_id
                    ORDER BY count DESC
                    LIMIT $limit";
        }
    }
    
    $results = $zbp->db->Query($sql);
    
    foreach ($results as $row) {
        $list[] = array(
            'id' => (int) $row['id'],
            'name' => $row['name'],
            'count' => (int) ($row['count'] ?? 0)
        );
    }
    
    return $list;
}

/**
 * 获取今日排行
 */
function get_today_top($type, $field, $limit) {
    global $zbp;
    
    $list = array();
    $today = date('Y-m-d');
    
    if ($type === 'recipe') {
        $logTable = $zbp->db->dbpre . 'recipe_stat_log';
        $postTable = $zbp->db->dbpre . 'post';
        
        $fieldMap = array(
            'view' => 'view_count',
            'like' => 'like_count',
            'recommend' => 'recommend_count'
        );
        
        $sql = "SELECT l.log_id as id, p.log_Title as name, l.{$fieldMap[$field]} as count
                FROM $logTable l
                LEFT JOIN $postTable p ON l.log_id = p.log_ID
                WHERE l.stat_date = '$today' AND p.log_Type = 0 AND p.log_Status = 0
                ORDER BY l.{$fieldMap[$field]} DESC
                LIMIT $limit";
    } else {
        $logTable = $zbp->db->dbpre . 'ingredient_stat_log';
        $ingredientTable = $zbp->db->dbpre . 'ingredient_detail';
        
        $fieldMap = array(
            'view' => 'view_count',
            'like' => 'like_count',
            'recommend' => 'recommend_count'
        );
        
        $sql = "SELECT l.ingredient_id as id, i.name, l.{$fieldMap[$field]} as count
                FROM $logTable l
                LEFT JOIN $ingredientTable i ON l.ingredient_id = i.ingredient_id
                WHERE l.stat_date = '$today'
                ORDER BY l.{$fieldMap[$field]} DESC
                LIMIT $limit";
    }
    
    $results = $zbp->db->Query($sql);
    
    foreach ($results as $row) {
        $list[] = array(
            'id' => (int) $row['id'],
            'name' => $row['name'] ?? '未知',
            'count' => (int) ($row['count'] ?? 0)
        );
    }
    
    return $list;
}

/**
 * 获取本月排行
 */
function get_month_top($type, $field, $limit) {
    global $zbp;
    
    $list = array();
    $monthStart = date('Y-m-01');
    $monthEnd = date('Y-m-t');
    
    if ($type === 'recipe') {
        $logTable = $zbp->db->dbpre . 'recipe_stat_log';
        $postTable = $zbp->db->dbpre . 'post';
        
        $fieldMap = array(
            'view' => 'view_count',
            'like' => 'like_count',
            'recommend' => 'recommend_count'
        );
        
        $sql = "SELECT l.log_id as id, p.log_Title as name, SUM(l.{$fieldMap[$field]}) as count
                FROM $logTable l
                LEFT JOIN $postTable p ON l.log_id = p.log_ID
                WHERE l.stat_date >= '$monthStart' AND l.stat_date <= '$monthEnd' AND p.log_Type = 0 AND p.log_Status = 0
                GROUP BY l.log_id
                ORDER BY count DESC
                LIMIT $limit";
    } else {
        $logTable = $zbp->db->dbpre . 'ingredient_stat_log';
        $ingredientTable = $zbp->db->dbpre . 'ingredient_detail';
        
        $fieldMap = array(
            'view' => 'view_count',
            'like' => 'like_count',
            'recommend' => 'recommend_count'
        );
        
        $sql = "SELECT l.ingredient_id as id, i.name, SUM(l.{$fieldMap[$field]}) as count
                FROM $logTable l
                LEFT JOIN $ingredientTable i ON l.ingredient_id = i.ingredient_id
                WHERE l.stat_date >= '$monthStart' AND l.stat_date <= '$monthEnd'
                GROUP BY l.ingredient_id
                ORDER BY count DESC
                LIMIT $limit";
    }
    
    $results = $zbp->db->Query($sql);
    
    foreach ($results as $row) {
        $list[] = array(
            'id' => (int) $row['id'],
            'name' => $row['name'] ?? '未知',
            'count' => (int) ($row['count'] ?? 0)
        );
    }
    
    return $list;
}