109 lines
3.7 KiB
PHP
109 lines
3.7 KiB
PHP
<?php
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namespace App\Core;
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use App\Services\InvoiceExtractionService;
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/**
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* Gemini AI Integration for Invoice Extraction
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* Optimized for Jordan UBL 2.1 Compliance
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*/
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class AI
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{
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private static string $baseUrl = "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent";
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private static int $maxRetries = 3;
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/**
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* Extract Data from Invoice Image or PDF (Base64)
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*/
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public static function extractInvoiceData(string $base64Data, string $mimeType): ?array
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{
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$apiKey = env('GEMINI_API_KEY');
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if (!$apiKey) {
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error_log('AI Error: GEMINI_API_KEY is missing');
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return null;
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}
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$service = new InvoiceExtractionService();
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$prompt = $service->buildExtractionPrompt();
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$payload = [
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"contents" => [
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[
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"parts" => [
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["text" => $prompt . " If the image is not an invoice, is blank, or is completely unreadable, return ONLY: {\"error\": \"invalid_invoice\"}. DO NOT guess or invent data."],
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[
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"inline_data" => [
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"mime_type" => $mimeType,
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"data" => $base64Data
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]
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]
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]
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]
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],
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"generationConfig" => [
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"response_mime_type" => "application/json"
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]
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];
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// Retry with exponential backoff for 503/429 errors
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for ($attempt = 1; $attempt <= self::$maxRetries; $attempt++) {
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$ch = curl_init(self::$baseUrl . "?key=" . $apiKey);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($ch, CURLOPT_POST, true);
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curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
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curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
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curl_setopt($ch, CURLOPT_TIMEOUT, 60);
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$response = curl_exec($ch);
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$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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$curlError = curl_error($ch);
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curl_close($ch);
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if ($curlError) {
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error_log("AI Error: cURL failed (attempt $attempt): $curlError");
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if ($attempt < self::$maxRetries) {
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$wait = pow(2, $attempt) + rand(1, 3);
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echo " Retrying in {$wait}s (cURL error)...\n";
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sleep($wait);
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continue;
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}
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return null;
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}
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if ($httpCode === 200) {
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break; // Success
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}
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// Retry on 503 (overloaded) or 429 (rate limit)
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if (in_array($httpCode, [503, 429]) && $attempt < self::$maxRetries) {
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$wait = pow(2, $attempt) + rand(1, 3);
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echo " Gemini $httpCode — retrying in {$wait}s (attempt $attempt/" . self::$maxRetries . ")...\n";
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sleep($wait);
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continue;
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}
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error_log("AI Error: Gemini API returned code $httpCode. Response: " . $response);
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return null;
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}
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if ($httpCode !== 200) {
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error_log("AI Error: All retries exhausted. Last code: $httpCode");
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return null;
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}
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$result = json_decode($response, true);
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$textResponse = $result['candidates'][0]['content']['parts'][0]['text'] ?? null;
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if (!$textResponse) return null;
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$data = json_decode($textResponse, true);
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if (isset($data['error']) && $data['error'] === 'invalid_invoice') {
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return null;
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}
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return $data;
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}
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}
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