<?php
/**
 * M2Pool ETH API 客户端
 */

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

class M2Pool_ETH_API {
    
    /**
     * API 基础 URL
     */
    private $api_url;
    
    /**
     * API 密钥
     */
    private $api_key;
    
    /**
     * 构造函数
     */
    public function __construct() {
        $this->api_url = get_option('m2pool_eth_api_url', 'http://localhost:8080');
        $this->api_key = get_option('m2pool_eth_api_key', '');
    }
    
    /**
     * 生成签名
     */
    private function generate_sign($timestamp) {
        if (empty($this->api_key)) {
            return '';
        }
        return hash('sha256', dechex($timestamp) . $this->api_key);
    }
    
    /**
     * 发送 HTTP 请求
     */
    private function request($endpoint, $method = 'GET', $data = array()) {
        $url = rtrim($this->api_url, '/') . '/' . ltrim($endpoint, '/');
        
        $args = array(
            'method' => $method,
            'timeout' => 30,
            'headers' => array(
                'Content-Type' => 'application/json',
            ),
        );
        
        if (!empty($data)) {
            $args['body'] = json_encode($data);
        }
        
        $response = wp_remote_request($url, $args);
        
        if (is_wp_error($response)) {
            return $response;
        }
        
        $body = wp_remote_retrieve_body($response);
        $code = wp_remote_retrieve_response_code($response);
        
        if ($code >= 200 && $code < 300) {
            $data = json_decode($body, true);
            return $data;
        } else {
            return new WP_Error('api_error', sprintf(__('API 错误: %s', 'm2pool-eth-payment'), $body), array('status' => $code));
        }
    }
    
    /**
     * 创建支付请求
     * 
     * 注意：这个方法假设有一个 HTTP API 接口。
     * 如果后端系统只支持 RabbitMQ，需要创建一个中间 API 服务。
     */
    public function create_payment($queue_id, $from_address, $to_address, $amount, $chain = 'ETH', $symbol = 'ETH') {
        $timestamp = time();
        $sign = $this->generate_sign($timestamp);
        
        $data = array(
            'queue_id' => $queue_id,
            'chain' => $chain,
            'symbol' => $symbol,
            'from_address' => $from_address,
            'to_address' => $to_address,
            'amount' => $amount,
            'fee' => 0,
            'timestamp' => $timestamp,
            'sign' => $sign,
        );
        
        // 发送到支付 API
        // 注意：这里需要根据实际的后端 API 接口调整
        // 如果后端只支持 RabbitMQ，需要创建一个中间 API 服务来处理
        $result = $this->request('/api/payment/create', 'POST', $data);
        
        if (is_wp_error($result)) {
            return $result;
        }
        
        return $result;
    }
    
    /**
     * 查询支付状态
     */
    public function get_payment_status($queue_id) {
        $result = $this->request('/api/payment/status/' . $queue_id, 'GET');
        
        if (is_wp_error($result)) {
            return $result;
        }
        
        return $result;
    }
    
    /**
     * 创建充值监听请求
     */
    public function create_topup($queue_id, $address, $chain = 'ETH', $symbol = 'ETH') {
        $timestamp = time();
        $sign = $this->generate_sign($timestamp);
        
        $data = array(
            'queue_id' => $queue_id,
            'chain' => $chain,
            'symbol' => $symbol,
            'address' => $address,
            'timestamp' => $timestamp,
            'sign' => $sign,
        );
        
        $result = $this->request('/api/topup/create', 'POST', $data);
        
        if (is_wp_error($result)) {
            return $result;
        }
        
        return $result;
    }
    
    /**
     * 查询充值状态
     */
    public function get_topup_status($queue_id) {
        $result = $this->request('/api/topup/status/' . $queue_id, 'GET');
        
        if (is_wp_error($result)) {
            return $result;
        }
        
        return $result;
    }
}