<?php

namespace App\Services;

use App\Models\ApiProvider;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class AiProviderService
{
    /**
     * 處理提示並獲取 AI 回應
     *
     * @param string $prompt
     * @return array
     */
    public function processPrompt(string $prompt): array
    {
        try {
            $active_provider = $this->getActiveProvider();

            if (!$active_provider) {
                throw new \Exception('No active AI provider available.');
            }

            return $this->sendToProvider($active_provider, $prompt);

        } catch (\Exception $e) {
            Log::error('AI Provider Error', [
                'error' => $e->getMessage(),
                'prompt' => $prompt
            ]);

            return [
                'success' => false,
                'error' => $e->getMessage()
            ];
        }
    }

    /**
     * 獲取當前活躍的 AI 提供者
     *
     * @return ApiProvider|null
     */
    private function getActiveProvider(): ?ApiProvider
    {
        return ApiProvider::where('active', true)->first();
    }

    /**
     * 向指定的 AI 提供者發送提示
     *
     * @param ApiProvider $provider
     * @param string $prompt
     * @return array
     */
    private function sendToProvider(ApiProvider $provider, string $prompt): array
    {
        $response = Http::withHeaders([
            'Authorization' => 'Bearer ' . $provider->api_key,
            'Content-Type' => 'application/json',
        ])->post($provider->endpoint, [
            'prompt' => $prompt,
            'max_tokens' => 1000,
        ]);

        if (!$response->successful()) {
            throw new \Exception('AI provider request failed: ' . $response->body());
        }

        return [
            'success' => true,
            'response' => $response->json('choices.0.text') ?? $response->json('response')
        ];
    }
}