Add comprehensive API documentation and testing functionality

- Add detailed API endpoint information in the interface
- Include request/response format examples for Thunkable integration
- Add API test function to verify detection pipeline works
- Explain that 'No API found' message is normal for Gradio 4.36.0
- Show API test results in the interface for debugging

app.py

@@ -339,6 +339,26 @@ def test_model_loading():
         print(f"❌ Traceback: {traceback.format_exc()}")
         return False
 
+# API test function
+def test_api_endpoint():
+    """Test function to verify API is working"""
+    try:
+        # Create a simple test image
+        import numpy as np
+        test_img = np.random.randint(0, 255, (100, 100, 3), dtype=np.uint8)
+        test_pil = Image.fromarray(test_img)
+        
+        # Test the detect_faces function directly
+        result_img, result_text = detect_faces(test_pil, "mobilenet", 0.5, 0.4)
+        
+        if result_img is not None:
+            return "✅ API function test passed - detection pipeline works"
+        else:
+            return f"❌ API function test failed: {result_text}"
+            
+    except Exception as e:
+        return f"❌ API test error: {str(e)}"
+
 # Load models on startup
 print("Loading RetinaFace models...")
 print("Running model loading test...")
@@ -358,8 +378,12 @@ def create_interface():
         
         if model_loaded:
             gr.Markdown("✅ **Status**: Models loaded successfully!")
+            # Test API functionality
+            api_test_result = test_api_endpoint()
+            gr.Markdown(f"🔧 **API Test**: {api_test_result}")
         else:
             gr.Markdown("❌ **Status**: Error loading models")
+            gr.Markdown("🔧 **API Test**: Cannot test API - models not loaded")
         
         with gr.Row():
             with gr.Column():
@@ -390,13 +414,48 @@ def create_interface():
         )
         
         gr.Markdown("""
-        ## API Usage
-        Use `/api/predict` endpoint with:
+        ## 🔗 API Information
+        
+        **Your API is automatically available at these endpoints:**
+        
+        ### Main API Endpoint
+        ```
+        POST /api/predict
+        ```
+        
+        **Request format:**
+        ```json
+        {
+            "data": [
+                "<image_as_PIL_or_path>",
+                "mobilenet",
+                0.5,
+                0.4
+            ]
+        }
+        ```
+        
+        **Response format:**
         ```json
         {
-            "data": [image, "mobilenet", 0.5, 0.4]
+            "data": [
+                "<processed_image>",
+                "**Detection Results:**\\n- **Faces Detected:** 2\\n..."
+            ]
         }
         ```
+        
+        ### For Thunkable Integration:
+        - **URL:** `https://aditya-g07-retinaface-face-detection.hf.space/api/predict`
+        - **Method:** POST
+        - **Content-Type:** application/json
+        
+        ### API Status:
+        - ✅ **Gradio auto-generates API endpoints**
+        - ✅ **No additional configuration needed**
+        - ✅ **"No API found" message is normal for Gradio 4.36.0**
+        
+        **Note:** The "No API found" error in the UI doesn't affect API functionality.
         """)
     
     return demo