<?php
/**
 * 前端功能管理类
 * 
 * 处理前端页面展示和用户交互
 */

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

/**
 * 前端管理类
 */
class Yoone_Frontend {
    
    /**
     * 构造函数
     */
    public function __construct() {
        $this->init_hooks();
    }
    
    /**
     * 初始化钩子
     */
    private function init_hooks() {
        // 产品页面钩子
        add_action('woocommerce_single_product_summary', array($this, 'display_bundle_options'), 25);
        add_action('woocommerce_single_product_summary', array($this, 'display_subscription_options'), 30);
        
        // 购物车钩子
        add_filter('woocommerce_cart_item_name', array($this, 'display_cart_bundle_info'), 10, 3);
        add_filter('woocommerce_cart_item_price', array($this, 'display_cart_subscription_info'), 10, 3);
        
        // 结账钩子
        add_action('woocommerce_checkout_order_review', array($this, 'display_checkout_subscription_info'));
        
        // 我的账户钩子
        add_filter('woocommerce_account_menu_items', array($this, 'add_subscriptions_menu_item'));
        add_action('init', array($this, 'add_subscriptions_endpoint'));
        add_action('woocommerce_account_subscriptions_endpoint', array($this, 'subscriptions_content'));
        
        // AJAX 钩子
        add_action('wp_ajax_yoone_calculate_bundle_price', array($this, 'ajax_calculate_bundle_price'));
        add_action('wp_ajax_nopriv_yoone_calculate_bundle_price', array($this, 'ajax_calculate_bundle_price'));
        add_action('wp_ajax_yoone_add_bundle_to_cart', array($this, 'ajax_add_bundle_to_cart'));
        add_action('wp_ajax_nopriv_yoone_add_bundle_to_cart', array($this, 'ajax_add_bundle_to_cart'));
        
        // 脚本和样式
        add_action('wp_enqueue_scripts', array($this, 'enqueue_scripts'));
        
        // 产品类型支持
        add_filter('woocommerce_product_class', array($this, 'product_class_filter'), 10, 2);
    }
    
    /**
     * 加载脚本和样式
     */
    public function enqueue_scripts() {
        if (is_product() || is_cart() || is_checkout() || is_account_page()) {
            wp_enqueue_script(
                'yoone-frontend',
                YOONE_SUBSCRIPTIONS_PLUGIN_URL . 'assets/js/frontend.js',
                array('jquery'),
                YOONE_SUBSCRIPTIONS_VERSION,
                true
            );
            
            wp_enqueue_style(
                'yoone-frontend',
                YOONE_SUBSCRIPTIONS_PLUGIN_URL . 'assets/css/frontend.css',
                array(),
                YOONE_SUBSCRIPTIONS_VERSION
            );
            
            wp_localize_script('yoone-frontend', 'yoone_frontend_params', array(
                'ajax_url' => admin_url('admin-ajax.php'),
                'nonce'    => wp_create_nonce('yoone_frontend_nonce'),
                'i18n'     => array(
                    'loading'           => __('加载中...', 'yoone-subscriptions'),
                    'error'             => __('发生错误，请重试', 'yoone-subscriptions'),
                    'select_products'   => __('请选择产品', 'yoone-subscriptions'),
                    'min_quantity'      => __('最小数量: %d', 'yoone-subscriptions'),
                    'max_quantity'      => __('最大数量: %d', 'yoone-subscriptions'),
                    'bundle_savings'    => __('套装优惠: %s', 'yoone-subscriptions'),
                    'subscription_info' => __('订阅信息', 'yoone-subscriptions'),
                )
            ));
        }
    }
    
    /*
    |--------------------------------------------------------------------------
    | 产品页面功能
    |--------------------------------------------------------------------------
    */
    
    /**
     * 显示套装选项
     */
    public function display_bundle_options() {
        global $product;
        
        if (!$product || $product->get_type() !== 'yoone_bundle') {
            return;
        }
        
        $bundle = new Yoone_Bundle();
        $bundle_data = $bundle->get_bundle_by_product_id($product->get_id());
        
        if (!$bundle_data) {
            return;
        }
        
        $bundle_items = $bundle->get_bundle_items($bundle_data['id']);
        
        if (empty($bundle_items)) {
            return;
        }
        
        wc_get_template(
            'single-product/bundle-options.php',
            array(
                'bundle'       => $bundle_data,
                'bundle_items' => $bundle_items,
                'product'      => $product
            ),
            '',
            YOONE_SUBSCRIPTIONS_PLUGIN_PATH . 'templates/'
        );
    }
    
    /**
     * 显示订阅选项
     */
    public function display_subscription_options() {
        global $product;
        
        if (!$product) {
            return;
        }
        
        $subscription_enabled = $product->get_meta('_yoone_subscription_enabled');
        
        if ($subscription_enabled !== 'yes') {
            return;
        }
        
        $subscription_data = array(
            'period'   => $product->get_meta('_yoone_subscription_period'),
            'interval' => $product->get_meta('_yoone_subscription_interval'),
            'length'   => $product->get_meta('_yoone_subscription_length'),
            'trial'    => $product->get_meta('_yoone_subscription_trial_length'),
            'signup'   => $product->get_meta('_yoone_subscription_signup_fee')
        );
        
        wc_get_template(
            'single-product/subscription-options.php',
            array(
                'subscription_data' => $subscription_data,
                'product'           => $product
            ),
            '',
            YOONE_SUBSCRIPTIONS_PLUGIN_PATH . 'templates/'
        );
    }
    
    /*
    |--------------------------------------------------------------------------
    | 购物车功能
    |--------------------------------------------------------------------------
    */
    
    /**
     * 显示购物车套装信息
     */
    public function display_cart_bundle_info($name, $cart_item, $cart_item_key) {
        if (isset($cart_item['yoone_bundle_data'])) {
            $bundle_data = $cart_item['yoone_bundle_data'];
            
            $name .= '<div class="yoone-bundle-info">';
            $name .= '<small>' . __('套装产品', 'yoone-subscriptions') . '</small>';
            
            if (!empty($bundle_data['items'])) {
                $name .= '<ul class="yoone-bundle-items">';
                foreach ($bundle_data['items'] as $item) {
                    $item_product = wc_get_product($item['product_id']);
                    if ($item_product) {
                        $name .= '<li>' . $item_product->get_name() . ' × ' . $item['quantity'] . '</li>';
                    }
                }
                $name .= '</ul>';
            }
            
            if (isset($bundle_data['savings']) && $bundle_data['savings'] > 0) {
                $name .= '<small class="yoone-savings">' . sprintf(__('节省: %s', 'yoone-subscriptions'), wc_price($bundle_data['savings'])) . '</small>';
            }
            
            $name .= '</div>';
        }
        
        return $name;
    }
    
    /**
     * 显示购物车订阅信息
     */
    public function display_cart_subscription_info($price, $cart_item, $cart_item_key) {
        if (isset($cart_item['yoone_subscription_data'])) {
            $subscription_data = $cart_item['yoone_subscription_data'];
            
            $price .= '<div class="yoone-subscription-info">';
            $price .= '<small>' . $this->format_subscription_string($subscription_data) . '</small>';
            $price .= '</div>';
        }
        
        return $price;
    }
    
    /*
    |--------------------------------------------------------------------------
    | 结账功能
    |--------------------------------------------------------------------------
    */
    
    /**
     * 显示结账订阅信息
     */
    public function display_checkout_subscription_info() {
        $has_subscription = false;
        
        foreach (WC()->cart->get_cart() as $cart_item) {
            if (isset($cart_item['yoone_subscription_data'])) {
                $has_subscription = true;
                break;
            }
        }
        
        if (!$has_subscription) {
            return;
        }
        
        echo '<div class="yoone-checkout-subscription-info">';
        echo '<h3>' . __('订阅信息', 'yoone-subscriptions') . '</h3>';
        echo '<p>' . __('您的订单包含订阅产品，将会自动续费。', 'yoone-subscriptions') . '</p>';
        
        foreach (WC()->cart->get_cart() as $cart_item) {
            if (isset($cart_item['yoone_subscription_data'])) {
                $product = $cart_item['data'];
                $subscription_data = $cart_item['yoone_subscription_data'];
                
                echo '<div class="subscription-item">';
                echo '<strong>' . $product->get_name() . '</strong><br>';
                echo '<small>' . $this->format_subscription_string($subscription_data) . '</small>';
                echo '</div>';
            }
        }
        
        echo '</div>';
    }
    
    /*
    |--------------------------------------------------------------------------
    | 我的账户功能
    |--------------------------------------------------------------------------
    */
    
    /**
     * 添加订阅菜单项
     */
    public function add_subscriptions_menu_item($items) {
        $new_items = array();
        
        foreach ($items as $key => $item) {
            $new_items[$key] = $item;
            
            if ($key === 'orders') {
                $new_items['subscriptions'] = __('我的订阅', 'yoone-subscriptions');
            }
        }
        
        return $new_items;
    }
    
    /**
     * 添加订阅端点
     */
    public function add_subscriptions_endpoint() {
        add_rewrite_endpoint('subscriptions', EP_ROOT | EP_PAGES);
    }
    
    /**
     * 订阅页面内容
     */
    public function subscriptions_content() {
        $customer_id = get_current_user_id();
        
        if (!$customer_id) {
            return;
        }
        
        // 获取用户订阅
        global $wpdb;
        
        $subscriptions = $wpdb->get_results($wpdb->prepare("
            SELECT * FROM {$wpdb->prefix}yoone_subscriptions 
            WHERE customer_id = %d 
            ORDER BY created_at DESC
        ", $customer_id));
        
        wc_get_template(
            'myaccount/subscriptions.php',
            array(
                'subscriptions' => $subscriptions,
                'customer_id'   => $customer_id
            ),
            '',
            YOONE_SUBSCRIPTIONS_PLUGIN_PATH . 'templates/'
        );
    }
    
    /*
    |--------------------------------------------------------------------------
    | AJAX 处理
    |--------------------------------------------------------------------------
    */
    
    /**
     * AJAX 计算套装价格
     */
    public function ajax_calculate_bundle_price() {
        check_ajax_referer('yoone_frontend_nonce', 'nonce');
        
        $bundle_id = intval($_POST['bundle_id']);
        $selected_items = isset($_POST['selected_items']) ? $_POST['selected_items'] : array();
        
        if (!$bundle_id || empty($selected_items)) {
            wp_send_json_error(__('无效的参数', 'yoone-subscriptions'));
        }
        
        $bundle = new Yoone_Bundle($bundle_id);
        
        if (!$bundle->get_id()) {
            wp_send_json_error(__('套装不存在', 'yoone-subscriptions'));
        }
        
        // 计算价格
        $total_price = 0;
        $original_price = 0;
        $valid_items = array();
        
        foreach ($selected_items as $item) {
            $product_id = intval($item['product_id']);
            $quantity = intval($item['quantity']);
            
            if ($quantity <= 0) {
                continue;
            }
            
            $product = wc_get_product($product_id);
            if (!$product) {
                continue;
            }
            
            $item_price = $product->get_price() * $quantity;
            $original_price += $item_price;
            
            $valid_items[] = array(
                'product_id' => $product_id,
                'quantity'   => $quantity,
                'price'      => $item_price
            );
        }
        
        if (empty($valid_items)) {
            wp_send_json_error(__('请选择有效的产品', 'yoone-subscriptions'));
        }
        
        // 应用套装折扣
        $bundle_price = $bundle->calculate_bundle_price($valid_items);
        $savings = $original_price - $bundle_price;
        
        wp_send_json_success(array(
            'original_price' => wc_price($original_price),
            'bundle_price'   => wc_price($bundle_price),
            'savings'        => wc_price($savings),
            'savings_amount' => $savings
        ));
    }
    
    /**
     * AJAX 添加套装到购物车
     */
    public function ajax_add_bundle_to_cart() {
        check_ajax_referer('yoone_frontend_nonce', 'nonce');
        
        $bundle_id = intval($_POST['bundle_id']);
        $selected_items = isset($_POST['selected_items']) ? $_POST['selected_items'] : array();
        
        if (!$bundle_id || empty($selected_items)) {
            wp_send_json_error(__('无效的参数', 'yoone-subscriptions'));
        }
        
        $bundle = new Yoone_Bundle($bundle_id);
        
        if (!$bundle->get_id()) {
            wp_send_json_error(__('套装不存在', 'yoone-subscriptions'));
        }
        
        // 验证数量限制
        $total_quantity = array_sum(array_column($selected_items, 'quantity'));
        
        if ($bundle->get_min_quantity() > 0 && $total_quantity < $bundle->get_min_quantity()) {
            wp_send_json_error(sprintf(__('最小数量要求: %d', 'yoone-subscriptions'), $bundle->get_min_quantity()));
        }
        
        if ($bundle->get_max_quantity() > 0 && $total_quantity > $bundle->get_max_quantity()) {
            wp_send_json_error(sprintf(__('最大数量限制: %d', 'yoone-subscriptions'), $bundle->get_max_quantity()));
        }
        
        // 创建套装产品并添加到购物车
        $bundle_product_id = $bundle->get_product_id();
        
        if (!$bundle_product_id) {
            wp_send_json_error(__('套装产品不存在', 'yoone-subscriptions'));
        }
        
        // 计算套装价格
        $bundle_price = $bundle->calculate_bundle_price($selected_items);
        $original_price = 0;
        
        foreach ($selected_items as $item) {
            $product = wc_get_product($item['product_id']);
            if ($product) {
                $original_price += $product->get_price() * $item['quantity'];
            }
        }
        
        $savings = $original_price - $bundle_price;
        
        // 添加到购物车
        $cart_item_data = array(
            'yoone_bundle_data' => array(
                'bundle_id'      => $bundle_id,
                'items'          => $selected_items,
                'original_price' => $original_price,
                'bundle_price'   => $bundle_price,
                'savings'        => $savings
            )
        );
        
        $cart_item_key = WC()->cart->add_to_cart($bundle_product_id, 1, 0, array(), $cart_item_data);
        
        if ($cart_item_key) {
            wp_send_json_success(array(
                'message' => __('套装已添加到购物车', 'yoone-subscriptions'),
                'cart_url' => wc_get_cart_url()
            ));
        } else {
            wp_send_json_error(__('添加到购物车失败', 'yoone-subscriptions'));
        }
    }
    
    /*
    |--------------------------------------------------------------------------
    | 辅助方法
    |--------------------------------------------------------------------------
    */
    
    /**
     * 格式化订阅字符串
     */
    private function format_subscription_string($subscription_data) {
        $period_strings = array(
            'day'   => __('天', 'yoone-subscriptions'),
            'week'  => __('周', 'yoone-subscriptions'),
            'month' => __('月', 'yoone-subscriptions'),
            'year'  => __('年', 'yoone-subscriptions')
        );
        
        $period = isset($subscription_data['period']) ? $subscription_data['period'] : 'month';
        $interval = isset($subscription_data['interval']) ? intval($subscription_data['interval']) : 1;
        
        $period_string = isset($period_strings[$period]) ? $period_strings[$period] : $period;
        
        if ($interval > 1) {
            return sprintf(__('每 %d %s', 'yoone-subscriptions'), $interval, $period_string);
        } else {
            return sprintf(__('每%s', 'yoone-subscriptions'), $period_string);
        }
    }
    
    /**
     * 产品类型过滤器
     */
    public function product_class_filter($classname, $product_type) {
        if ($product_type === 'yoone_bundle') {
            return 'Yoone_Bundle_Product';
        }
        
        return $classname;
    }
    
    /**
     * 获取用户订阅统计
     */
    public function get_customer_subscription_stats($customer_id) {
        global $wpdb;
        
        $stats = $wpdb->get_row($wpdb->prepare("
            SELECT 
                COUNT(*) as total_subscriptions,
                SUM(CASE WHEN status = 'active' THEN 1 ELSE 0 END) as active_subscriptions,
                SUM(CASE WHEN status = 'paused' THEN 1 ELSE 0 END) as paused_subscriptions,
                SUM(CASE WHEN status = 'cancelled' THEN 1 ELSE 0 END) as cancelled_subscriptions,
                SUM(CASE WHEN status = 'active' THEN total ELSE 0 END) as monthly_total
            FROM {$wpdb->prefix}yoone_subscriptions 
            WHERE customer_id = %d
        ", $customer_id), ARRAY_A);
        
        return $stats;
    }
}