app.py

import gradio as gr
from utils import process_video

# Define supported languages
language_map = {
    "English": None,
    "Hindi": "Helsinki-NLP/opus-mt-en-hi",
    "Spanish": "Helsinki-NLP/opus-mt-en-es",
    "French": "Helsinki-NLP/opus-mt-en-fr",
    "German": "Helsinki-NLP/opus-mt-en-de",
    "Telugu": "facebook/nllb-200-distilled-600M",
    "Portuguese": "Helsinki-NLP/opus-mt-en-pt",
    "Russian": "Helsinki-NLP/opus-mt-en-ru",
    "Chinese": "Helsinki-NLP/opus-mt-en-zh",
    "Arabic": "Helsinki-NLP/opus-mt-en-ar",
    "Japanese": "Helsinki-NLP/opus-mt-en-jap"
}

# Custom CSS for a professional look
css = """
body {
    background-color: #1a1a1a;
    color: #e0e0e0;
    font-family: 'Segoe UI', sans-serif;
}
.gradio-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    border-radius: 8px;
    background: #2d2d2d;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
.file-preview {
    border: 2px dashed #007acc;
    padding: 20px;
    border-radius: 8px;
}
.progress-text {
    color: #00ff00;
    font-weight: bold;
    margin-top: 10px;
}
"""

# Define Gradio Interface
with gr.Blocks(theme=gr.themes.Monochrome(), css=css) as demo:
    gr.Markdown("# 🎥 AI-Powered Video Subtitling")
    gr.Markdown("Upload a video (MP4/MKV/AVI) and select a language to generate subtitles.")

    with gr.Row():
        with gr.Column(scale=2):
            video_input = gr.File(
                label="Upload Video File",
                file_types=["mp4", "mkv", "avi"],  # Extensions without leading dots
                elem_classes=["file-preview"]
            )
        with gr.Column(scale=1):
            language_dropdown = gr.Dropdown(
                choices=list(language_map.keys()),
                label="Select Subtitle Language",
                value="English"
            )

    generate_button = gr.Button("Generate Subtitles 🚀", elem_classes=["btn-primary"])
    progress_text = gr.Textbox(
        label="Status",
        interactive=False,
        elem_classes=["progress-text"]
    )
    output_srt = gr.File(label="Download Subtitles")

    def generate_subtitles(video_file, language):
        try:
            # Validate original filename (not the temporary path)
            if not video_file.orig_name.lower().endswith(('.mp4', '.mkv', '.avi')):
                return None, "❌ Invalid file type. Please upload an MP4, MKV, or AVI file."

            # Initialize progress tracking
            progress = gr.Progress(track_tqdm=True)

            # Process video using the temporary file path
            progress(0, desc="Initializing...")
            srt_path = process_video(video_file.name, language, progress=progress)  # Use video_file.name for processing
            if srt_path:
                progress(1, desc="✅ Subtitles generated successfully!")
                return gr.File(srt_path), "✅ Subtitles ready for download!"
            else:
                progress(0, desc="❌ Error during processing.")
                return None, "❌ Failed to generate subtitles. Check logs."

        except Exception as e:
            progress(0, desc="❌ Error encountered.")
            return None, f"❌ Error: {str(e)}"

    generate_button.click(
        generate_subtitles,
        inputs=[video_input, language_dropdown],
        outputs=[output_srt, progress_text]
    )

demo.launch()