<?php
/**
 * 📋 查重API接口
 * 
 * 用于用户投稿时查询重复率
 * 支持菜品、食材、营养成分、菜品内容、食材内容查重
 * 
 * 访问方式: /api/api_check_duplicate.php?act=xxx
 */

$startTime = microtime(true);

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

require_once 'response.php';

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

$act = strtolower(trim($_GET['act'] ?? ''));
$format = ApiResponse::getFormat();

$allowedActs = array(
    'recipe_title',
    'ingredient_name', 
    'nutrition_name',
    'recipe_content',
    'ingredient_content'
);

if (!in_array($act, $allowedActs)) {
    $result = array(
        'code' => 400,
        'message' => '❌ 无效的查重类型',
        'data' => null,
        '_query_time' => round((microtime(true) - $startTime) * 1000, 2) . 'ms'
    );
    ApiResponse::output($result, $format);
    exit;
}

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

ApiResponse::output($result, $format);
exit;

// ==================== 查重函数 ====================

/**
 * 菜品标题查重
 * 参数: title - 菜品标题
 * 返回: 重复率百分比
 */
function check_recipe_title() {
    global $zbp;
    
    $title = trim($_GET['title'] ?? $_POST['title'] ?? '');
    
    if (empty($title)) {
        return array(
            'code' => 400,
            'message' => '❌ 缺少菜品标题参数',
            'data' => null
        );
    }
    
    $tablePost = $zbp->db->dbpre . 'post';
    $sql = "SELECT log_Title FROM {$tablePost} WHERE log_Type = 0";
    $rows = $zbp->db->Query($sql);
    
    $maxSimilarity = 0;
    $titleLimited = mb_substr($title, 0, 100);
    
    foreach ($rows as $row) {
        $existingTitle = mb_substr($row['log_Title'], 0, 100);
        similar_text($titleLimited, $existingTitle, $similarity);
        
        if ($similarity > $maxSimilarity) {
            $maxSimilarity = $similarity;
        }
        
        if ($maxSimilarity >= 100) {
            break;
        }
    }
    
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => array(
            'duplicate_rate' => round($maxSimilarity, 2)
        )
    );
}

/**
 * 食材名称查重
 * 参数: name - 食材名称
 * 返回: 重复率百分比
 */
function check_ingredient_name() {
    global $zbp;
    
    $name = trim($_GET['name'] ?? $_POST['name'] ?? '');
    
    if (empty($name)) {
        return array(
            'code' => 400,
            'message' => '❌ 缺少食材名称参数',
            'data' => null
        );
    }
    
    $tableIngredient = $zbp->db->dbpre . 'ingredient_detail';
    $sql = "SELECT name FROM {$tableIngredient}";
    $rows = $zbp->db->Query($sql);
    
    $maxSimilarity = 0;
    $nameLimited = mb_substr($name, 0, 100);
    
    foreach ($rows as $row) {
        $existingName = mb_substr($row['name'], 0, 100);
        similar_text($nameLimited, $existingName, $similarity);
        
        if ($similarity > $maxSimilarity) {
            $maxSimilarity = $similarity;
        }
        
        if ($maxSimilarity >= 100) {
            break;
        }
    }
    
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => array(
            'duplicate_rate' => round($maxSimilarity, 2)
        )
    );
}

/**
 * 营养成分查重
 * 参数: name - 营养成分名称
 * 返回: 重复率百分比
 */
function check_nutrition_name() {
    global $zbp;
    
    $name = trim($_GET['name'] ?? $_POST['name'] ?? '');
    
    if (empty($name)) {
        return array(
            'code' => 400,
            'message' => '❌ 缺少营养成分名称参数',
            'data' => null
        );
    }
    
    $tableNutrition = $zbp->db->dbpre . 'recipe_nutrition';
    $sql = "SELECT DISTINCT name FROM {$tableNutrition}";
    $rows = $zbp->db->Query($sql);
    
    $maxSimilarity = 0;
    $nameLimited = mb_substr($name, 0, 100);
    
    foreach ($rows as $row) {
        $existingName = mb_substr($row['name'], 0, 100);
        similar_text($nameLimited, $existingName, $similarity);
        
        if ($similarity > $maxSimilarity) {
            $maxSimilarity = $similarity;
        }
        
        if ($maxSimilarity >= 100) {
            break;
        }
    }
    
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => array(
            'duplicate_rate' => round($maxSimilarity, 2)
        )
    );
}

/**
 * 菜品内容查重
 * 参数: content - 菜品内容（制作步骤等）
 * 返回: 重复率百分比
 */
function check_recipe_content() {
    global $zbp;
    
    $content = trim($_GET['content'] ?? $_POST['content'] ?? '');
    
    if (empty($content)) {
        return array(
            'code' => 400,
            'message' => '❌ 缺少菜品内容参数',
            'data' => null
        );
    }
    
    $tablePost = $zbp->db->dbpre . 'post';
    $sql = "SELECT log_Content FROM {$tablePost} WHERE log_Type = 0 LIMIT 1000";
    $rows = $zbp->db->Query($sql);
    
    $maxSimilarity = 0;
    $contentLimited = mb_substr($content, 0, 100);
    $contentLength = mb_strlen($contentLimited);
    
    foreach ($rows as $row) {
        $existingContent = mb_substr(strip_tags($row['log_Content']), 0, 100);
        $existingLength = mb_strlen($existingContent);
        
        if ($existingLength > 0 && $contentLength > 0) {
            similar_text($contentLimited, $existingContent, $similarity);
            
            if ($similarity > $maxSimilarity) {
                $maxSimilarity = $similarity;
            }
            
            if ($maxSimilarity >= 100) {
                break;
            }
        }
    }
    
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => array(
            'duplicate_rate' => round($maxSimilarity, 2)
        )
    );
}

/**
 * 食材内容查重
 * 参数: content - 食材内容（功效、营养、使用提示等）
 * 返回: 重复率百分比
 */
function check_ingredient_content() {
    global $zbp;
    
    $content = trim($_GET['content'] ?? $_POST['content'] ?? '');
    
    if (empty($content)) {
        return array(
            'code' => 400,
            'message' => '❌ 缺少食材内容参数',
            'data' => null
        );
    }
    
    $tableIngredientDetail = $zbp->db->dbpre . 'ingredient_detail';
    $sql = "SELECT effect, nutrition, usage_tip FROM {$tableIngredientDetail} LIMIT 1000";
    $rows = $zbp->db->Query($sql);
    
    $maxSimilarity = 0;
    $contentLimited = mb_substr($content, 0, 100);
    $contentLength = mb_strlen($contentLimited);
    
    foreach ($rows as $row) {
        $existingContent = '';
        if (!empty($row['effect'])) {
            $existingContent .= $row['effect'] . ' ';
        }
        if (!empty($row['nutrition'])) {
            $existingContent .= $row['nutrition'] . ' ';
        }
        if (!empty($row['usage_tip'])) {
            $existingContent .= $row['usage_tip'];
        }
        
        $existingContent = mb_substr(trim($existingContent), 0, 100);
        $existingLength = mb_strlen($existingContent);
        
        if ($existingLength > 0 && $contentLength > 0) {
            similar_text($contentLimited, $existingContent, $similarity);
            
            if ($similarity > $maxSimilarity) {
                $maxSimilarity = $similarity;
            }
            
            if ($maxSimilarity >= 100) {
                break;
            }
        }
    }
    
    return array(
        'code' => 200,
        'message' => 'success',
        'data' => array(
            'duplicate_rate' => round($maxSimilarity, 2)
        )
    );
}