110 lines
4.4 KiB
PHP
110 lines
4.4 KiB
PHP
<?php
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namespace App\Services;
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use App\Core\Database;
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use App\Core\Env;
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class AiVideoGeneratorService
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{
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/**
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* Step 1: Generate the Educational Script using Gemini
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* Takes the complex Markdown and simplifies it into a lively script with examples.
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*/
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public static function generateLivelyScript(int $lessonId): ?array
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{
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$lesson = Database::selectOne(
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"SELECT l.*, c.subject_id FROM lessons l JOIN courses c ON l.course_id = c.id WHERE l.id = ?",
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[$lessonId]
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);
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if (!$lesson || empty($lesson['markdown_content'])) {
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throw new \Exception("Lesson not found or has no markdown content.");
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}
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// Determine Language based on subject or content (assuming Subject ID 2 might be English)
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$isEnglish = ($lesson['subject_id'] == 2) || (stripos($lesson['title'], 'english') !== false);
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$prompt = self::buildPrompt($lesson['title'], $lesson['markdown_content'], $isEnglish);
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// Call Gemini to get the script
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return self::callGemini($prompt);
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}
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private static function buildPrompt(string $title, string $content, bool $isEnglish): string
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{
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if ($isEnglish) {
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return "You are a world-class, enthusiastic English teacher.
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Transform the following lesson content into a lively, highly engaging video script.
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Use simple vocabulary, lots of practical examples, and a friendly tone.
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Output as JSON: {\"narration_text\": \"...\", \"visual_cues\": \"...\"}
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Lesson Title: {$title}
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Content: {$content}";
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} else {
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return "أنت معلم خبير، مبدع ومحبوب جداً لدى الطلاب.
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قم بتحويل محتوى الدرس التالي إلى (سكربت/سيناريو) مفعم بالحيوية والنشاط لتسجيله كفيديو تعليمي.
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يجب أن يكون الشرح بسيطاً جداً، يستخدم أمثلة من الحياة الواقعية، وبلغة عربية فصحى مبسطة (أو لهجة قريبة للقلب).
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أريد الإجابة بصيغة JSON فقط كالتالي:
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{
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\"narration_text\": \"النص الذي سيقرأه المعلم الذكي أو التعليق الصوتي\",
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\"visual_cues\": \"وصف للمشاهد البصرية أو الرسوم التي يجب أن تظهر على الشاشة\"
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}
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عنوان الدرس: {$title}
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المحتوى: {$content}";
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}
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}
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private static function callGemini(string $prompt): ?array
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{
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$apiKey = Env::get('GEMINI_KEY');
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if (!$apiKey) return null;
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$model = Env::get('GEMINI_MODEL') ?: 'gemini-flash-lite-latest';
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$url = "https://generativelanguage.googleapis.com/v1beta/models/{$model}:generateContent?key={$apiKey}";
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$payload = [
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'contents' => [['parts' => [['text' => $prompt]]]],
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'generationConfig' => ['responseMimeType' => 'application/json', 'temperature' => 0.7]
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];
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$ch = curl_init($url);
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curl_setopt_array($ch, [
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CURLOPT_POST => true,
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CURLOPT_POSTFIELDS => json_encode($payload),
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CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
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CURLOPT_RETURNTRANSFER => true,
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CURLOPT_TIMEOUT => 60
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]);
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$res = curl_exec($ch);
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curl_close($ch);
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if (!$res) return null;
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$json = json_decode($res, true);
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$text = $json['candidates'][0]['content']['parts'][0]['text'] ?? '';
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$text = preg_replace('/^```json\s*/i', '', $text);
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$text = preg_replace('/```\s*$/i', '', $text);
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return json_decode(trim($text), true);
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}
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/**
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* Step 2: Call external AI Video/Avatar API (e.g., HeyGen, Synthesia)
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* (Placeholder for future API integration)
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*/
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public static function triggerVideoGenerationApi(int $lessonId, string $scriptText): string
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{
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// TODO: Integrate with specific Video API (HeyGen, D-ID, Synthesia)
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// 1. Send $scriptText to API
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// 2. Receive Webhook or Poll for MP4 URL
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// 3. Download MP4
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// 4. Pass MP4 to our VideoService::transcodeToHls()
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return "pending_api_integration";
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}
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}
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