src/app.py

import gradio as gr
import os
from detector import analyze_text, get_components

# Pre-load model
print("Starting AI Text Detector...")
try:
    get_components()
    model_status = "✅ Model loaded successfully!"
except Exception as e:
    model_status = f"⚠️ Model loading issue: {str(e)}"

print(model_status)

# Custom CSS for better styling
css = """
.gradio-container {
    max-width: 1200px !important;
}
.result-human {
    padding: 10px;
    border-radius: 5px;
    background: #f0f8f0;
    border-left: 4px solid #4CAF50;
}
.result-ai {
    padding: 10px;
    border-radius: 5px;
    background: #fff0f0;
    border-left: 4px solid #f44336;
}
.chunk-human {
    background: #f8fff8;
    margin: 5px 0;
    padding: 8px;
    border-radius: 3px;
    border-left: 3px solid #4CAF50;
}
.chunk-ai {
    background: #fff8f8;
    margin: 5px 0;
    padding: 8px;
    border-radius: 3px;
    border-left: 3px solid #f44336;
}
.confidence-high { color: #388E3C; }
.confidence-medium { color: #F57C00; }
.confidence-low { color: #D32F2F; }
"""

def analyze_text_interface(text, threshold, chunk_size):
    """
    Interface function for Gradio
    """
    if not text or not text.strip():
        return "❌ Please enter some text to analyze.", "", ""
    
    try:
        result = analyze_text(text, threshold=threshold, chunk_size=chunk_size)
        
        if "error" in result:
            return f"❌ Error: {result['error']}", "", ""
        
        # Overall result
        overall_html = f"""
        <div class="result-{result['overall_type'].lower()}">
            <h3>Overall Result: {result['overall_type']}</h3>
            <p><strong>Confidence:</strong> {result['overall_confidence']:.2%}</p>
            <p><strong>AI Score:</strong> {result['overall_score']:.3f}</p>
            <p><strong>AI Artifacts Detected:</strong> {'✅ Yes' if result['has_artifacts'] else '❌ No'}</p>
            <p><strong>Chunk Analysis:</strong> {result['ai_chunks']} AI / {result['human_chunks']} Human</p>
        </div>
        """
        
        # Chunk details
        chunk_html = "<h3>Detailed Chunk Analysis:</h3>"
        for i, chunk in enumerate(result['chunks']):
            confidence_class = "confidence-high" if chunk['confidence'] > 0.8 else "confidence-medium" if chunk['confidence'] > 0.6 else "confidence-low"
            chunk_html += f"""
            <div class="chunk-{chunk['type'].lower()}">
                <strong>Chunk {i+1}:</strong> {chunk['type']}
                <br><small>Confidence: <span class="{confidence_class}">{chunk['confidence']:.2%}</span></small>
                <br><small>Text: "{chunk['text'][:100]}{'...' if len(chunk['text']) > 100 else ''}"</small>
            </div>
            """
        
        # Raw data for download
        raw_data = {
            "overall_type": result['overall_type'],
            "overall_confidence": result['overall_confidence'],
            "overall_score": result['overall_score'],
            "has_artifacts": result['has_artifacts'],
            "chunk_analysis": {
                "ai_chunks": result['ai_chunks'],
                "human_chunks": result['human_chunks'],
                "total_chunks": result['total_chunks']
            },
            "chunks": result['chunks']
        }
        
        return overall_html, chunk_html, str(raw_data)
        
    except Exception as e:
        return f"❌ Analysis failed: {str(e)}", "", ""

# Example texts
examples = [
    ["This is a sample text written by a human. It contains natural variations in writing style and occasional imperfections that make it authentic."],
    ["The aforementioned textual content exhibits characteristics consistent with AI-generated material, including syntactic patterns and lexical choices commonly associated with large language models."],
    ["Hello world! This is a test. I hope this works correctly. The weather is nice today."]
]

# Create Gradio interface
with gr.Blocks(css=css, title="AI Text Detector") as demo:
    gr.Markdown(
        """
        # 🔍 AI Text Detector
        *Detect AI-generated text using advanced machine learning models*
        
        **Model Status:** {}
        """.format(model_status)
    )
    
    with gr.Row():
        with gr.Column():
            text_input = gr.Textbox(
                label="Input Text",
                placeholder="Paste or type the text you want to analyze here...",
                lines=8,
                max_lines=20
            )
            
            with gr.Row():
                threshold = gr.Slider(
                    minimum=0.1,
                    maximum=0.9,
                    value=0.5,
                    step=0.05,
                    label="Detection Threshold",
                    info="Higher values = more strict AI detection"
                )
                
                chunk_size = gr.Slider(
                    minimum=40,
                    maximum=200,
                    value=80,
                    step=10,
                    label="Chunk Size (tokens)",
                    info="Smaller chunks = more detailed analysis"
                )
            
            analyze_btn = gr.Button("Analyze Text", variant="primary")
            
            gr.Examples(
                examples=examples,
                inputs=text_input,
                label="Try these examples:"
            )
        
        with gr.Column():
            overall_output = gr.HTML(label="Overall Result")
            chunk_output = gr.HTML(label="Chunk Details")
            raw_output = gr.Textbox(
                label="Raw Data (for download)",
                lines=4,
                max_lines=10
            )
    
    # Footer
    gr.Markdown(
        """
        ---
        **How it works:**
        - Text is split into meaningful chunks
        - Each chunk is analyzed by the AI detection model
        - Results are aggregated for overall classification
        - Built with `abhi099k/ai-text-detector-v-n4.0` model
        
        **Note:** This tool provides probabilistic estimates and should be used as one of several indicators when evaluating text authenticity.
        """
    )
    
    # Connect the function
    analyze_btn.click(
        fn=analyze_text_interface,
        inputs=[text_input, threshold, chunk_size],
        outputs=[overall_output, chunk_output, raw_output]
    )

# Launch the app
if __name__ == "__main__":
    demo.launch(
        server_name="0.0.0.0",
        server_port=7860,
        share=False
    )