<?php

namespace App\Service\common\ai;

use App\BaseApp\BaseService;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\GuzzleException;
use Throwable;

/**
 * DeepSeek Agent（OpenAI 兼容协议）
 * 每次调用从 AiRuntimeConfigService 取最新平台/密钥/模型
 */
class DeepSeekAiAgent extends BaseService implements AiAgentInterface
{
    public function __construct()
    {
        // Agent 本身不读用户态，避免工厂链路强制鉴权
        $this->isAuth = false;
        parent::__construct();
    }

    public function provider(): string
    {
        return 'deepseek';
    }

    /**
     * 调用 DeepSeek chat completions
     */
    public function chatCompletions(array $messages, array $options = []): AiChatResult
    {
        $cfg = AiRuntimeConfigService::getInstance()->resolve($this->provider());
        $apiUrl = (string) ($cfg['api_url'] ?? '');
        $apiKey = (string) ($cfg['api_key'] ?? '');
        $defaultModel = (string) ($cfg['model'] ?? 'deepseek-chat');
        $timeout = (float) ($cfg['timeout'] ?? 60);
        if ($apiKey === '') {
            $this->utils->errorThrow('DeepSeek 暂未开通（请在「AI密钥管理」或 .env DEEPSEEK_API_KEY 配置）');
        }
        if ($apiUrl === '') {
            $this->utils->errorThrow('未配置 DeepSeek 接口地址');
        }
        if (empty($messages)) {
            $this->utils->errorThrow('AI 对话消息不能为空');
        }
        $model = (string) ($options['model'] ?? $defaultModel);
        $body = [
            'model' => $model,
            'messages' => array_values($messages),
            'stream' => false,
        ];
        foreach (['temperature', 'max_tokens', 'top_p'] as $key) {
            if (array_key_exists($key, $options)) {
                $body[$key] = $options[$key];
            }
        }
        try {
            $client = new Client([
                'timeout' => $timeout,
                'connect_timeout' => min(10.0, $timeout),
            ]);
            $response = $client->request('POST', $apiUrl, [
                'headers' => [
                    'Authorization' => 'Bearer ' . $apiKey,
                    'Content-Type' => 'application/json',
                ],
                'json' => $body,
            ]);
            $raw = json_decode((string) $response->getBody(), true);
            if (!is_array($raw)) {
                $this->utils->errorThrow('DeepSeek 返回非 JSON');
            }
            $content = (string) data_get($raw, 'choices.0.message.content', '');
            if ($content === '') {
                $errMsg = (string) ($raw['error']['message'] ?? '');
                $this->utils->errorThrow($errMsg !== '' ? ('DeepSeek 调用失败：' . $errMsg) : 'DeepSeek 未返回有效内容');
            }
            $usage = is_array($raw['usage'] ?? null) ? $raw['usage'] : [];
            return new AiChatResult(
                $content,
                $raw,
                $this->provider(),
                $model,
                $usage,
                (int) ($cfg['api_key_id'] ?? 0)
            );
        } catch (Throwable $e) {
            if ($e instanceof GuzzleException) {
                $this->utils->errorThrow('DeepSeek 请求失败：' . $e->getMessage());
            }
            throw $e;
        }
    }
}