<?php
/**
 * M2Pool ETH 支付网关类
 */

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

class M2Pool_ETH_Gateway extends WC_Payment_Gateway {
    
    /**
     * 构造函数
     */
    public function __construct() {
        $this->id = 'm2pool_eth';
        $this->icon = apply_filters('woocommerce_m2pool_eth_icon', '');
        $this->has_fields = false;
        $this->method_title = __('M2Pool ETH 支付', 'm2pool-eth-payment');
        $this->method_description = __('接受以太坊 (ETH) 支付', 'm2pool-eth-payment');
        $this->supports = array(
            'products',
        );
        
        // 加载设置
        $this->init_form_fields();
        $this->init_settings();
        
        // 定义用户可见的设置
        $this->title = $this->get_option('title', __('ETH 支付', 'm2pool-eth-payment'));
        $this->description = $this->get_option('description', __('使用以太坊进行支付', 'm2pool-eth-payment'));
        $this->enabled = $this->get_option('enabled', 'no');
        
        // 保存设置
        add_action('woocommerce_update_options_payment_gateways_' . $this->id, array($this, 'process_admin_options'));
        
        // 支付完成页面
        add_action('woocommerce_thankyou_' . $this->id, array($this, 'thankyou_page'));
        
        // 订单详情页面
        add_action('woocommerce_order_details_after_order_table', array($this, 'order_details'), 10, 1);
        
        // 确保在结账页面显示
        add_filter('woocommerce_available_payment_gateways', array($this, 'ensure_available'), 100);
    }
    
    /**
     * 确保支付网关可用（强制显示）
     */
    public function ensure_available($available_gateways) {
        // 如果已启用且配置正确，确保在列表中
        if ($this->enabled === 'yes') {
            $to_address = $this->get_option('to_address', get_option('m2pool_eth_to_address', ''));
            if (!empty($to_address) && $this->is_available()) {
                // 确保网关在可用列表中
                if (!isset($available_gateways[$this->id])) {
                    $available_gateways[$this->id] = $this;
                }
            }
        }
        return $available_gateways;
    }
    
    /**
     * 检查支付网关是否可用
     */
    public function is_available() {
        // 检查是否启用
        if ($this->enabled !== 'yes') {
            if (defined('WP_DEBUG') && WP_DEBUG) {
                error_log('M2Pool ETH Gateway: Not enabled');
            }
            return false;
        }
        
        // 检查是否有接收地址
        $to_address = $this->get_option('to_address', get_option('m2pool_eth_to_address', ''));
        if (empty($to_address)) {
            if (defined('WP_DEBUG') && WP_DEBUG) {
                error_log('M2Pool ETH Gateway: No receive address configured');
            }
            return false;
        }
        
        // 检查是否有订单（在结账页面）
        if (is_checkout() || is_checkout_pay_page()) {
            // 在结账页面，确保有订单
            $order_id = absint(get_query_var('order-pay'));
            if ($order_id > 0) {
                $order = wc_get_order($order_id);
                if (!$order || $order->get_total() <= 0) {
                    if (defined('WP_DEBUG') && WP_DEBUG) {
                        error_log('M2Pool ETH Gateway: Invalid order or zero amount');
                    }
                    return false;
                }
            }
        }
        
        // 调用父类方法
        $parent_available = parent::is_available();
        
        // 如果父类返回 false，记录原因（用于调试）
        if (!$parent_available && defined('WP_DEBUG') && WP_DEBUG) {
            $order = WC()->cart;
            $total = $order ? $order->get_total() : 0;
            error_log(sprintf(
                'M2Pool ETH Gateway: Parent is_available() returned false. Cart total: %s, Enabled: %s, Address: %s',
                $total,
                $this->enabled,
                !empty($to_address) ? 'set' : 'empty'
            ));
        }
        
        return $parent_available;
    }
    
    /**
     * 初始化表单字段
     */
    public function init_form_fields() {
        $this->form_fields = array(
            'enabled' => array(
                'title' => __('启用/禁用', 'm2pool-eth-payment'),
                'type' => 'checkbox',
                'label' => __('启用 M2Pool ETH 支付', 'm2pool-eth-payment'),
                'default' => 'no',
            ),
            'title' => array(
                'title' => __('标题', 'm2pool-eth-payment'),
                'type' => 'text',
                'description' => __('客户在结账时看到的支付方式标题', 'm2pool-eth-payment'),
                'default' => __('ETH 支付', 'm2pool-eth-payment'),
                'desc_tip' => true,
            ),
            'description' => array(
                'title' => __('描述', 'm2pool-eth-payment'),
                'type' => 'textarea',
                'description' => __('客户在结账时看到的支付方式描述', 'm2pool-eth-payment'),
                'default' => __('使用以太坊 (ETH) 进行支付', 'm2pool-eth-payment'),
                'desc_tip' => true,
            ),
            'from_address' => array(
                'title' => __('发送地址', 'm2pool-eth-payment'),
                'type' => 'text',
                'description' => __('用于接收支付的以太坊地址', 'm2pool-eth-payment'),
                'default' => get_option('m2pool_eth_from_address', ''),
                'desc_tip' => true,
            ),
            'to_address' => array(
                'title' => __('接收地址', 'm2pool-eth-payment'),
                'type' => 'text',
                'description' => __('用于接收支付的以太坊地址', 'm2pool-eth-payment'),
                'default' => get_option('m2pool_eth_to_address', ''),
                'desc_tip' => true,
            ),
            'chain' => array(
                'title' => __('链名称', 'm2pool-eth-payment'),
                'type' => 'select',
                'options' => array(
                    'ETH' => 'Ethereum',
                ),
                'default' => 'ETH',
            ),
            'symbol' => array(
                'title' => __('代币符号', 'm2pool-eth-payment'),
                'type' => 'select',
                'options' => array(
                    'ETH' => 'ETH',
                    'USDT' => 'USDT',
                ),
                'default' => 'ETH',
            ),
        );
    }
    
    /**
     * 处理支付
     */
    public function process_payment($order_id) {
        $order = wc_get_order($order_id);
        
        if (!$order) {
            wc_add_notice(__('订单不存在', 'm2pool-eth-payment'), 'error');
            return;
        }
        
        // 获取 API 客户端
        $api = new M2Pool_ETH_API();
        
        // 准备支付请求
        $amount = floatval($order->get_total());
        $from_address = $this->get_option('from_address', get_option('m2pool_eth_from_address', ''));
        $to_address = $this->get_option('to_address', get_option('m2pool_eth_to_address', ''));
        $chain = $this->get_option('chain', 'ETH');
        $symbol = $this->get_option('symbol', 'ETH');
        
        if (empty($to_address)) {
            wc_add_notice(__('支付网关配置错误：接收地址未设置', 'm2pool-eth-payment'), 'error');
            return;
        }
        
        // 生成队列 ID
        $queue_id = 'wp_' . $order_id . '_' . time();
        
        // 发送支付请求
        $result = $api->create_payment($queue_id, $from_address, $to_address, $amount, $chain, $symbol);
        
        if (is_wp_error($result)) {
            wc_add_notice($result->get_error_message(), 'error');
            return;
        }
        
        // 保存支付信息到数据库
        global $wpdb;
        $table_name = $wpdb->prefix . 'm2pool_eth_payments';
        
        $wpdb->insert(
            $table_name,
            array(
                'order_id' => $order_id,
                'queue_id' => $queue_id,
                'from_address' => $from_address,
                'to_address' => $to_address,
                'amount' => $amount,
                'fee' => isset($result['fee']) ? $result['fee'] : 0,
                'chain' => $chain,
                'symbol' => $symbol,
                'status' => 0, // 待支付
            ),
            array('%d', '%s', '%s', '%s', '%f', '%f', '%s', '%s', '%d')
        );
        
        // 更新订单元数据
        $order->update_meta_data('_m2pool_queue_id', $queue_id);
        $order->update_meta_data('_m2pool_payment_address', $to_address);
        $order->update_meta_data('_m2pool_payment_amount', $amount);
        $order->update_meta_data('_m2pool_payment_chain', $chain);
        $order->update_meta_data('_m2pool_payment_symbol', $symbol);
        $order->save();
        
        // 将订单状态设置为待支付
        $order->update_status('pending', __('等待 ETH 支付', 'm2pool-eth-payment'));
        
        // 启动支付监听
        $listener = new M2Pool_ETH_Listener();
        $listener->start_listening($order_id);
        
        // 返回成功
        return array(
            'result' => 'success',
            'redirect' => $this->get_return_url($order),
        );
    }
    
    /**
     * 感谢页面
     */
    public function thankyou_page($order_id) {
        $order = wc_get_order($order_id);
        
        if (!$order || $order->get_payment_method() !== $this->id) {
            return;
        }
        
        $payment_address = $order->get_meta('_m2pool_payment_address');
        $payment_amount = $order->get_meta('_m2pool_payment_amount');
        $payment_symbol = $order->get_meta('_m2pool_payment_symbol');
        $queue_id = $order->get_meta('_m2pool_queue_id');
        
        if (!$payment_address || !$payment_amount) {
            return;
        }
        
        include M2POOL_ETH_PLUGIN_DIR . 'templates/payment-instructions.php';
    }
    
    /**
     * 订单详情页面
     */
    public function order_details($order) {
        if ($order->get_payment_method() !== $this->id) {
            return;
        }
        
        $payment_address = $order->get_meta('_m2pool_payment_address');
        $payment_amount = $order->get_meta('_m2pool_payment_amount');
        $payment_symbol = $order->get_meta('_m2pool_payment_symbol');
        $tx_hash = $order->get_meta('_m2pool_tx_hash');
        
        if (!$payment_address || !$payment_amount) {
            return;
        }
        
        ?>
        <section class="woocommerce-order-details m2pool-eth-payment-details">
            <h2 class="woocommerce-order-details__title"><?php echo esc_html__('ETH 支付信息', 'm2pool-eth-payment'); ?></h2>
            <table class="woocommerce-table woocommerce-table--order-details shop_table order_details">
                <tbody>
                    <tr>
                        <th><?php echo esc_html__('支付地址', 'm2pool-eth-payment'); ?>:</th>
                        <td><code><?php echo esc_html($payment_address); ?></code></td>
                    </tr>
                    <tr>
                        <th><?php echo esc_html__('支付金额', 'm2pool-eth-payment'); ?>:</th>
                        <td><?php echo esc_html($payment_amount); ?> <?php echo esc_html($payment_symbol); ?></td>
                    </tr>
                    <?php if ($tx_hash): ?>
                    <tr>
                        <th><?php echo esc_html__('交易哈希', 'm2pool-eth-payment'); ?>:</th>
                        <td><a href="https://etherscan.io/tx/<?php echo esc_attr($tx_hash); ?>" target="_blank"><?php echo esc_html($tx_hash); ?></a></td>
                    </tr>
                    <?php endif; ?>
                </tbody>
            </table>
        </section>
        <?php
    }
}