<?php

namespace addons\shopro_huifu\library;

use think\Request;

/**
 * 解析汇付异步通知原始报文（不可走 htmlspecialchars 等全局 filter）
 */
class HuifuNotifyParser
{
    public static function parse(Request $request = null)
    {
        $request = $request ?: Request::instance();

        // 优先从原始 body 解析，避免 PHP 将 form 中 Base64 签名的 + 转成空格
        $raw = method_exists($request, 'getInput') ? (string) $request->getInput() : '';
        if ($raw === '') {
            $raw = (string) file_get_contents('php://input');
        }
        if ($raw !== '') {
            $contentType = strtolower((string) $request->contentType());
            if (strpos($contentType, 'application/json') !== false) {
                $decoded = json_decode($raw, true);
                if (is_array($decoded)) {
                    $sign = self::normalizeSign((string) ($decoded['sign'] ?? ''));
                    $respData = $decoded['resp_data'] ?? '';
                    if (is_array($respData)) {
                        $respData = json_encode($respData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
                    }
                    return [
                        'sign'      => $sign,
                        'resp_data' => (string) $respData,
                    ];
                }
            } else {
                $parsed = self::parseFormPreservePlus($raw);
                if (!empty($parsed['resp_data']) || !empty($parsed['sign'])) {
                    return $parsed;
                }
            }
        }

        if (!empty($_POST['resp_data']) || !empty($_POST['sign'])) {
            return [
                'sign'      => self::normalizeSign((string) ($_POST['sign'] ?? '')),
                'resp_data' => (string) ($_POST['resp_data'] ?? ''),
            ];
        }

        return ['sign' => '', 'resp_data' => ''];
    }

    /**
     * parse_str 会把 + 解码为空格，会破坏 Base64 签名
     */
    protected static function parseFormPreservePlus($raw)
    {
        $parsed = [];
        parse_str(str_replace('+', '%2B', $raw), $parsed);

        $sign = self::normalizeSign((string) ($parsed['sign'] ?? ''));
        $respData = (string) ($parsed['resp_data'] ?? '');

        if ($respData === '' && isset($parsed['data']) && is_string($parsed['data'])) {
            $inner = json_decode($parsed['data'], true);
            if (is_array($inner)) {
                $respData = $inner['resp_data'] ?? '';
                if (is_array($respData)) {
                    $respData = json_encode($respData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
                }
                $respData = (string) $respData;
                if ($sign === '' && !empty($inner['sign'])) {
                    $sign = self::normalizeSign((string) $inner['sign']);
                }
            }
        }

        return [
            'sign'      => $sign,
            'resp_data' => $respData,
        ];
    }

    public static function normalizeSign($sign)
    {
        return str_replace(' ', '+', trim((string) $sign));
    }
}