<?php

namespace addons\shopro\library\ccblife;

use think\Exception;
use think\Log;

/**
 * 建行生活HTTP客户端类
 *
 * 功能:
 * - 发送HTTP请求到建行
 * - 处理HTTP响应
 * - 失败重试机制
 * - 超时控制
 *
 * @author Billy
 * @date 2025-01-16
 */
class CcbHttpClient
{
    /**
     * 配置信息
     * @var array
     */
    private $config;

    /**
     * 加密实例
     * @var CcbEncryption
     */
    private $encryption;

    /**
     * 构造函数
     *
     * @param array $config 配置数组
     */
    public function __construct($config = [])
    {
        if (empty($config)) {
            $config = config('ccblife');
        }

        $this->config = $config;
        $this->encryption = new CcbEncryption($config);
    }

    /**
     * 发送请求到建行
     *
     * @param string $txCode 交易代码 (如: A3341TP01)
     * @param array $bodyData 业务数据
     * @return array 解密后的响应数据
     * @throws Exception
     */
    public function request($txCode, $bodyData)
    {
        // 记录开始时间
        $startTime = microtime(true);

        try {
            // 1. 获取接口地址
            $url = $this->getApiUrl($txCode);

            // 2. 构建加密报文
            $requestData = $this->encryption->buildEncryptedMessage($txCode, $bodyData);

            // 3. 记录请求日志
            $this->logRequest($txCode, $bodyData, $requestData);

            // 4. 发送HTTP请求 (带重试机制)
            $response = $this->retry(function () use ($url, $requestData) {
                return $this->post($url, $requestData);
            });

            // 5. 解析响应
            $result = $this->encryption->parseResponse($response);

            // 6. 记录响应日志
            $costTime = round((microtime(true) - $startTime) * 1000, 2);
            $this->logResponse($txCode, $result, $costTime);

            // 7. 检查业务返回码
            $this->checkReturnCode($result);

            return $result;

        } catch (Exception $e) {
            // 记录错误日志
            $costTime = round((microtime(true) - $startTime) * 1000, 2);
            $this->logError($txCode, $e->getMessage(), $costTime);

            throw $e;
        }
    }

    /**
     * 发送POST请求
     *
     * @param string $url 请求URL
     * @param array $data 请求数据
     * @return string 响应内容
     * @throws Exception
     */
    private function post($url, $data)
    {
        // 初始化CURL
        $ch = curl_init();

        // 设置CURL选项
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->config['http']['timeout'] ?? 30);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Accept: application/json',
            'Content-Type: application/json',
        ]);

        // 如果是HTTPS,验证证书
        if (strpos($url, 'https') === 0) {
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
        }

        // 执行请求
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);

        // 检查CURL错误
        if ($error) {
            throw new Exception('CURL错误: ' . $error);
        }

        // 检查HTTP状态码
        if ($httpCode == 404) {
            throw new Exception('接口404,请检查请求头是否包含Accept和Content-Type');
        }

        if ($httpCode !== 200) {
            throw new Exception('HTTP错误码: ' . $httpCode . ', 响应: ' . $response);
        }

        return $response;
    }

    /**
     * 重试机制
     *
     * @param callable $callable 要执行的函数
     * @param int|null $maxRetries 最大重试次数
     * @return mixed 执行结果
     * @throws Exception
     */
    private function retry($callable, $maxRetries = null)
    {
        if ($maxRetries === null) {
            $maxRetries = $this->config['http']['retry_times'] ?? 3;
        }

        $delays = $this->config['http']['retry_delay'] ?? [1, 2, 5];
        $lastException = null;

        for ($i = 0; $i <= $maxRetries; $i++) {
            try {
                return $callable();
            } catch (Exception $e) {
                $lastException = $e;

                // 如果是最后一次尝试,不再重试
                if ($i >= $maxRetries) {
                    break;
                }

                // 等待后重试
                $delay = $delays[$i] ?? 5;
                $this->logRetry($i + 1, $maxRetries, $delay, $e->getMessage());
                sleep($delay);
            }
        }

        throw new Exception('请求失败,已重试' . $maxRetries . '次: ' . $lastException->getMessage());
    }

    /**
     * 获取API地址
     *
     * @param string $txCode 交易代码
     * @return string 完整API地址
     */
    private function getApiUrl($txCode)
    {
        $baseUrl = $this->config['api_base_url'] ?? '';

        if (empty($baseUrl)) {
            throw new Exception('API基础地址未配置');
        }

        return $baseUrl . '?txcode=' . $txCode;
    }

    /**
     * 检查业务返回码
     *
     * @param array $result 响应数据
     * @throws Exception
     */
    private function checkReturnCode($result)
    {
        // 检查CLD_HEADER中的RET_CODE
        $retCode = $result['CLD_HEADER']['RET_CODE'] ?? '';
        $retMsg = $result['CLD_HEADER']['RET_MSG'] ?? '未知错误';

        if ($retCode !== '000000') {
            throw new Exception('建行接口返回错误[' . $retCode . ']: ' . $retMsg);
        }
    }

    /**
     * 记录请求日志
     *
     * @param string $txCode 交易代码
     * @param array $bodyData 业务数据
     * @param array $requestData 加密后的请求数据
     */
    private function logRequest($txCode, $bodyData, $requestData)
    {
        if (!($this->config['log']['enabled'] ?? true)) {
            return;
        }

        Log::info('[建行请求] ' . $txCode . ' svcid:' . $requestData['svcid'] . ' mac:' . $requestData['mac'] . ' cnt_length:' . strlen($requestData['cnt']) . ' body_data:' . json_encode($bodyData, JSON_UNESCAPED_UNICODE));
    }

    /**
     * 记录响应日志
     *
     * @param string $txCode 交易代码
     * @param array $result 响应数据
     * @param float $costTime 耗时(毫秒)
     */
    private function logResponse($txCode, $result, $costTime)
    {
        if (!($this->config['log']['enabled'] ?? true)) {
            return;
        }

        Log::info('[建行响应] ' . $txCode . ' ret_code:' . ($result['CLD_HEADER']['RET_CODE'] ?? '') . ' ret_msg:' . ($result['CLD_HEADER']['RET_MSG'] ?? '') . ' cost_time:' . $costTime . 'ms');
    }

    /**
     * 记录错误日志
     *
     * @param string $txCode 交易代码
     * @param string $errorMsg 错误信息
     * @param float $costTime 耗时(毫秒)
     */
    private function logError($txCode, $errorMsg, $costTime)
    {
        if (!($this->config['log']['enabled'] ?? true)) {
            return;
        }

        Log::error('[建行错误] ' . $txCode . ' error:' . $errorMsg . ' cost_time:' . $costTime . 'ms');
    }

    /**
     * 记录重试日志
     *
     * @param int $currentRetry 当前重试次数
     * @param int $maxRetries 最大重试次数
     * @param int $delay 延迟秒数
     * @param string $reason 重试原因
     */
    private function logRetry($currentRetry, $maxRetries, $delay, $reason)
    {
        if (!($this->config['log']['enabled'] ?? true)) {
            return;
        }

        Log::warning('[建行重试] retry:' . $currentRetry . '/' . $maxRetries . ' delay:' . $delay . 's reason:' . $reason);
    }
}