<?php

namespace app\common\service;

use app\common\model\ai\AiConfig;

class MTranServerService
{
    public static function translate(string $text, string $target = 'zh-Hans', string $source = 'auto'): array
    {
        $text = trim($text);
        if ($text === '') {
            return ['success' => false, 'error' => '翻译内容为空'];
        }

        $baseUrl = rtrim(AiConfig::getVal('mtranserver_base_url', 'http://127.0.0.1:8989'), '/');
        $apiToken = trim(AiConfig::getVal('mtranserver_api_token', ''));

        $payload = [
            'from' => $source ?: 'auto',
            'to' => $target ?: 'zh-Hans',
            'text' => $text,
        ];

        $headers = ['Content-Type: application/json'];
        if ($apiToken !== '') {
            $headers[] = 'Authorization: Bearer ' . $apiToken;
        }

        $startTime = microtime(true);
        $ch = curl_init($baseUrl . '/translate');
        curl_setopt_array($ch, [
            CURLOPT_POST => true,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_POSTFIELDS => json_encode($payload, JSON_UNESCAPED_UNICODE),
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 120,
            CURLOPT_SSL_VERIFYPEER => false,
        ]);

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);

        $costMs = (int) ((microtime(true) - $startTime) * 1000);

        if ($error) {
            return ['success' => false, 'error' => 'MTranServer 请求失败: ' . $error, 'tokens' => 0, 'cost_ms' => $costMs];
        }

        $data = json_decode((string) $response, true);
        if ($httpCode !== 200) {
            $message = is_array($data) ? ($data['message'] ?? $data['error'] ?? ('HTTP ' . $httpCode)) : ('HTTP ' . $httpCode);
            return ['success' => false, 'error' => 'MTranServer 返回异常: ' . $message, 'tokens' => 0, 'cost_ms' => $costMs];
        }

        $result = trim((string) ($data['result'] ?? ''));
        if ($result === '') {
            return ['success' => false, 'error' => 'MTranServer 翻译结果为空', 'tokens' => 0, 'cost_ms' => $costMs];
        }

        return [
            'success' => true,
            'content' => $result,
            'tokens' => 0,
            'cost_ms' => $costMs,
        ];
    }
}