<?php
/**
 * 混装产品前端展示类
 * 
 * 处理混装产品的前端显示和用户交互
 */

if (!defined('ABSPATH')) {
    exit;
}

/**
 * 混装产品前端展示类
 */
class Yoone_Bundle_Frontend {
    
    /**
     * 构造函数
     */
    public function __construct() {
        $this->init_hooks();
    }
    
    /**
     * 初始化钩子
     */
    private function init_hooks() {
        // 在产品页面显示混装选项
        add_action('woocommerce_single_product_summary', array($this, 'display_bundle_options'), 25);
        
        // 处理混装产品添加到购物车
        add_filter('woocommerce_add_to_cart_validation', array($this, 'validate_bundle_add_to_cart'), 10, 3);
        add_action('woocommerce_add_to_cart', array($this, 'add_bundle_to_cart'), 10, 6);
        
        // 在购物车中显示混装信息
        add_filter('woocommerce_get_item_data', array($this, 'display_bundle_cart_item_data'), 10, 2);
        
        // 计算混装价格
        add_action('woocommerce_before_calculate_totals', array($this, 'calculate_bundle_cart_item_price'));
        
        // 加载前端脚本和样式
        add_action('wp_enqueue_scripts', array($this, 'enqueue_scripts'));
    }
    
    /**
     * 显示混装选项
     */
    public function display_bundle_options() {
        global $product;
        
        if (!$product || !$this->is_bundle_product($product->get_id())) {
            return;
        }
        
        $bundle = $this->get_product_bundle($product->get_id());
        if (!$bundle || !$bundle->is_available()) {
            return;
        }
        
        $items = $bundle->get_items();
        if (empty($items)) {
            return;
        }
        
        // 加载模板
        wc_get_template(
            'single-product/bundle-options.php',
            array(
                'bundle' => $bundle,
                'items' => $items,
                'product' => $product
            ),
            '',
            YOONE_SUBSCRIPTIONS_PLUGIN_PATH . 'templates/frontend/'
        );
    }
    
    /**
     * 验证混装产品添加到购物车
     */
    public function validate_bundle_add_to_cart($passed, $product_id, $quantity) {
        if (!$this->is_bundle_product($product_id)) {
            return $passed;
        }
        
        $bundle = $this->get_product_bundle($product_id);
        if (!$bundle) {
            wc_add_notice(__('混装产品不存在', 'yoone-subscriptions'), 'error');
            return false;
        }
        
        // 验证数量
        if (!$bundle->validate_quantity($quantity)) {
            $min = $bundle->get_min_quantity();
            $max = $bundle->get_max_quantity();
            
            if ($max) {
                $message = sprintf(__('数量必须在 %d 到 %d 之间', 'yoone-subscriptions'), $min, $max);
            } else {
                $message = sprintf(__('最小数量为 %d', 'yoone-subscriptions'), $min);
            }
            
            wc_add_notice($message, 'error');
            return false;
        }
        
        // 验证选择的商品
        $selected_items = isset($_POST['bundle_items']) ? $_POST['bundle_items'] : array();
        if (empty($selected_items)) {
            wc_add_notice(__('请选择混装商品', 'yoone-subscriptions'), 'error');
            return false;
        }
        
        // 验证必需商品
        $bundle_items = $bundle->get_items();
        foreach ($bundle_items as $item) {
            if ($item['is_required'] && !isset($selected_items[$item['product_id']])) {
                $product = wc_get_product($item['product_id']);
                $message = sprintf(__('必须选择商品: %s', 'yoone-subscriptions'), $product->get_name());
                wc_add_notice($message, 'error');
                return false;
            }
        }
        
        // 验证库存
        foreach ($selected_items as $item_product_id => $item_quantity) {
            $item_product = wc_get_product($item_product_id);
            if (!$item_product) {
                continue;
            }
            
            if (!$item_product->has_enough_stock($item_quantity * $quantity)) {
                $message = sprintf(__('商品 %s 库存不足', 'yoone-subscriptions'), $item_product->get_name());
                wc_add_notice($message, 'error');
                return false;
            }
        }
        
        return $passed;
    }
    
    /**
     * 添加混装产品到购物车
     */
    public function add_bundle_to_cart($cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data) {
        if (!$this->is_bundle_product($product_id)) {
            return;
        }
        
        $selected_items = isset($_POST['bundle_items']) ? $_POST['bundle_items'] : array();
        if (empty($selected_items)) {
            return;
        }
        
        // 保存混装信息到购物车项目
        WC()->cart->cart_contents[$cart_item_key]['bundle_items'] = $selected_items;
        WC()->cart->cart_contents[$cart_item_key]['is_bundle'] = true;
    }
    
    /**
     * 在购物车中显示混装信息
     */
    public function display_bundle_cart_item_data($item_data, $cart_item) {
        if (!isset($cart_item['is_bundle']) || !$cart_item['is_bundle']) {
            return $item_data;
        }
        
        if (!isset($cart_item['bundle_items']) || empty($cart_item['bundle_items'])) {
            return $item_data;
        }
        
        $item_data[] = array(
            'key' => __('混装商品', 'yoone-subscriptions'),
            'value' => $this->format_bundle_items($cart_item['bundle_items'])
        );
        
        return $item_data;
    }
    
    /**
     * 计算混装购物车项目价格
     */
    public function calculate_bundle_cart_item_price($cart) {
        if (is_admin() && !defined('DOING_AJAX')) {
            return;
        }
        
        foreach ($cart->get_cart() as $cart_item_key => $cart_item) {
            if (!isset($cart_item['is_bundle']) || !$cart_item['is_bundle']) {
                continue;
            }
            
            $product_id = $cart_item['product_id'];
            $bundle = $this->get_product_bundle($product_id);
            
            if (!$bundle) {
                continue;
            }
            
            $selected_items = isset($cart_item['bundle_items']) ? $cart_item['bundle_items'] : array();
            $bundle_price = $bundle->calculate_price($this->format_selected_items($selected_items));
            
            // 设置新价格
            $cart_item['data']->set_price($bundle_price);
        }
    }
    
    /**
     * 加载前端脚本和样式
     */
    public function enqueue_scripts() {
        if (is_product()) {
            wp_enqueue_script(
                'yoone-bundle-frontend',
                YOONE_SUBSCRIPTIONS_PLUGIN_URL . 'assets/js/bundle-frontend.js',
                array('jquery'),
                YOONE_SUBSCRIPTIONS_VERSION,
                true
            );
            
            wp_enqueue_style(
                'yoone-bundle-frontend',
                YOONE_SUBSCRIPTIONS_PLUGIN_URL . 'assets/css/bundle-frontend.css',
                array(),
                YOONE_SUBSCRIPTIONS_VERSION
            );
            
            // 本地化脚本
            wp_localize_script('yoone-bundle-frontend', 'yoone_bundle_params', array(
                'ajax_url' => admin_url('admin-ajax.php'),
                'nonce' => wp_create_nonce('yoone_bundle_nonce'),
                'i18n' => array(
                    'select_items' => __('请选择商品', 'yoone-subscriptions'),
                    'calculating' => __('计算中...', 'yoone-subscriptions'),
                    'error' => __('发生错误', 'yoone-subscriptions')
                )
            ));
        }
    }
    
    /*
    |--------------------------------------------------------------------------
    | 辅助方法
    |--------------------------------------------------------------------------
    */
    
    /**
     * 检查是否为混装产品
     */
    private function is_bundle_product($product_id) {
        $bundle = $this->get_product_bundle($product_id);
        return $bundle && $bundle->is_available();
    }
    
    /**
     * 获取产品的混装配置
     */
    private function get_product_bundle($product_id) {
        static $bundles = array();
        
        if (!isset($bundles[$product_id])) {
            global $wpdb;
            
            $bundle_id = $wpdb->get_var($wpdb->prepare("
                SELECT id FROM {$wpdb->prefix}yoone_bundles 
                WHERE product_id = %d AND status = 'active'
                LIMIT 1
            ", $product_id));
            
            if ($bundle_id) {
                $bundles[$product_id] = new Yoone_Bundle($bundle_id);
            } else {
                $bundles[$product_id] = false;
            }
        }
        
        return $bundles[$product_id];
    }
    
    /**
     * 格式化混装商品显示
     */
    private function format_bundle_items($bundle_items) {
        $formatted = array();
        
        foreach ($bundle_items as $product_id => $quantity) {
            $product = wc_get_product($product_id);
            if ($product) {
                $formatted[] = sprintf('%s × %d', $product->get_name(), $quantity);
            }
        }
        
        return implode(', ', $formatted);
    }
    
    /**
     * 格式化选择的商品为计算格式
     */
    private function format_selected_items($selected_items) {
        $formatted = array();
        
        foreach ($selected_items as $product_id => $quantity) {
            $formatted[] = array(
                'product_id' => $product_id,
                'quantity' => $quantity,
                'discount_type' => 'none',
                'discount_value' => 0,
                'is_required' => false,
                'sort_order' => 0
            );
        }
        
        return $formatted;
    }
}

// 初始化
new Yoone_Bundle_Frontend();