feat: Add AiVideoGeneratorService for automated lively video script generation

2026-08-29 00:50:53 +03:00
parent 294a60ecdb
commit 728f82181b
1 changed files with 109 additions and 0 deletions
@@ -0,0 +1,109 @@
+<?php
+
+namespace App\Services;
+
+use App\Core\Database;
+use App\Core\Env;
+
+class AiVideoGeneratorService
+{
+    /**
+     * Step 1: Generate the Educational Script using Gemini
+     * Takes the complex Markdown and simplifies it into a lively script with examples.
+     */
+    public static function generateLivelyScript(int $lessonId): ?array
+    {
+        $lesson = Database::selectOne(
+            "SELECT l.*, c.subject_id FROM lessons l JOIN courses c ON l.course_id = c.id WHERE l.id = ?", 
+            [$lessonId]
+        );
+        
+        if (!$lesson || empty($lesson['markdown_content'])) {
+            throw new \Exception("Lesson not found or has no markdown content.");
+        }
+
+        // Determine Language based on subject or content (assuming Subject ID 2 might be English)
+        $isEnglish = ($lesson['subject_id'] == 2) || (stripos($lesson['title'], 'english') !== false);
+        
+        $prompt = self::buildPrompt($lesson['title'], $lesson['markdown_content'], $isEnglish);
+        
+        // Call Gemini to get the script
+        return self::callGemini($prompt);
+    }
+
+    private static function buildPrompt(string $title, string $content, bool $isEnglish): string
+    {
+        if ($isEnglish) {
+            return "You are a world-class, enthusiastic English teacher. 
+            Transform the following lesson content into a lively, highly engaging video script. 
+            Use simple vocabulary, lots of practical examples, and a friendly tone.
+            Output as JSON: {\"narration_text\": \"...\", \"visual_cues\": \"...\"}
+            
+            Lesson Title: {$title}
+            Content: {$content}";
+        } else {
+            return "أنت معلم خبير، مبدع ومحبوب جداً لدى الطلاب.
+            قم بتحويل محتوى الدرس التالي إلى (سكربت/سيناريو) مفعم بالحيوية والنشاط لتسجيله كفيديو تعليمي.
+            يجب أن يكون الشرح بسيطاً جداً، يستخدم أمثلة من الحياة الواقعية، وبلغة عربية فصحى مبسطة (أو لهجة قريبة للقلب).
+            
+            أريد الإجابة بصيغة JSON فقط كالتالي:
+            {
+                \"narration_text\": \"النص الذي سيقرأه المعلم الذكي أو التعليق الصوتي\",
+                \"visual_cues\": \"وصف للمشاهد البصرية أو الرسوم التي يجب أن تظهر على الشاشة\"
+            }
+            
+            عنوان الدرس: {$title}
+            المحتوى: {$content}";
+        }
+    }
+
+    private static function callGemini(string $prompt): ?array
+    {
+        $apiKey = Env::get('GEMINI_API_KEY');
+        if (!$apiKey) return null;
+
+        $model = Env::get('GEMINI_MODEL') ?: 'gemini-flash-lite-latest';
+        $url = "https://generativelanguage.googleapis.com/v1beta/models/{$model}:generateContent?key={$apiKey}";
+
+        $payload = [
+            'contents' => [['parts' => [['text' => $prompt]]]],
+            'generationConfig' => ['responseMimeType' => 'application/json', 'temperature' => 0.7]
+        ];
+
+        $ch = curl_init($url);
+        curl_setopt_array($ch, [
+            CURLOPT_POST => true,
+            CURLOPT_POSTFIELDS => json_encode($payload),
+            CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_TIMEOUT => 60
+        ]);
+        $res = curl_exec($ch);
+        curl_close($ch);
+
+        if (!$res) return null;
+        
+        $json = json_decode($res, true);
+        $text = $json['candidates'][0]['content']['parts'][0]['text'] ?? '';
+        
+        $text = preg_replace('/^```json\s*/i', '', $text);
+        $text = preg_replace('/```\s*$/i', '', $text);
+        
+        return json_decode(trim($text), true);
+    }
+
+    /**
+     * Step 2: Call external AI Video/Avatar API (e.g., HeyGen, Synthesia)
+     * (Placeholder for future API integration)
+     */
+    public static function triggerVideoGenerationApi(int $lessonId, string $scriptText): string
+    {
+        // TODO: Integrate with specific Video API (HeyGen, D-ID, Synthesia)
+        // 1. Send $scriptText to API
+        // 2. Receive Webhook or Poll for MP4 URL
+        // 3. Download MP4
+        // 4. Pass MP4 to our VideoService::transcodeToHls()
+        
+        return "pending_api_integration";
+    }
+}