112 lines
4.0 KiB
PHP
112 lines
4.0 KiB
PHP
<?php
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namespace App\Services\LlmPrediction;
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use App\Enums\PredictionSource;
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use App\Enums\TrendDirection;
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use App\Models\BrentPrice;
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use App\Models\PricePrediction;
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use App\Services\ApiLogger;
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use Illuminate\Support\Collection;
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use Illuminate\Support\Facades\Http;
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use Illuminate\Support\Facades\Log;
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use Throwable;
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class GeminiPredictionProvider implements OilPredictionProvider
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{
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private const int LLM_MAX_CONFIDENCE = 85;
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public function __construct(
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private readonly ApiLogger $apiLogger,
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) {}
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public function predict(Collection $prices): ?PricePrediction
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{
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if (! config('services.gemini.api_key')) {
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return null;
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}
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$priceList = $prices->sortBy('date')
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->map(fn (BrentPrice $p) => $p->date->toDateString().': $'.$p->price_usd)
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->implode("\n");
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$model = config('services.gemini.model', 'gemini-2.0-flash');
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$url = "https://generativelanguage.googleapis.com/v1beta/models/{$model}:generateContent";
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try {
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$response = $this->apiLogger->send('gemini', 'POST', $url, fn () => Http::timeout(15)
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->withQueryParameters(['key' => config('services.gemini.api_key')])
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->post($url, [
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'contents' => [[
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'parts' => [['text' => $this->prompt($priceList)]],
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]],
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'generationConfig' => [
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'responseMimeType' => 'application/json',
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'responseSchema' => [
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'type' => 'OBJECT',
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'properties' => [
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'direction' => [
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'type' => 'STRING',
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'enum' => ['rising', 'falling', 'flat'],
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],
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'confidence' => ['type' => 'INTEGER'],
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'reasoning' => ['type' => 'STRING'],
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],
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'required' => ['direction', 'confidence', 'reasoning'],
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],
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],
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]));
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if (! $response->successful()) {
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Log::error('GeminiPredictionProvider: request failed', ['status' => $response->status()]);
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return null;
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}
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$text = $response->json('candidates.0.content.parts.0.text') ?? '';
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$data = json_decode($text, true);
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if (! isset($data['direction'], $data['confidence'], $data['reasoning'])) {
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Log::error('GeminiPredictionProvider: unexpected response format', ['text' => $text]);
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return null;
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}
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$direction = TrendDirection::tryFrom($data['direction']);
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if ($direction === null) {
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Log::error('GeminiPredictionProvider: invalid direction', ['direction' => $data['direction']]);
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return null;
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}
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return new PricePrediction([
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'predicted_for' => now()->toDateString(),
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'source' => PredictionSource::Llm,
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'direction' => $direction,
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'confidence' => min((int) $data['confidence'], self::LLM_MAX_CONFIDENCE),
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'reasoning' => $data['reasoning'],
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'generated_at' => now(),
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]);
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} catch (Throwable $e) {
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Log::error('GeminiPredictionProvider: predict failed', ['error' => $e->getMessage()]);
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return null;
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}
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}
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private function prompt(string $priceList): string
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{
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return <<<PROMPT
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You are analyzing Brent crude oil price data for a UK fuel price alert service.
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Predict the short-term direction over the next 3–5 days.
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Recent Brent crude prices (USD/barrel):
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{$priceList}
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Respond with direction (rising, falling, or flat), a confidence score (0–85),
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and a one-sentence reasoning.
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PROMPT;
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}
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}
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