import os
import random
import ffmpeg
import gradio as gr
import traceback

# Function to add music to video
def add_music_to_video(video_path, chunks_folder="chunks", output_path="output_with_music.mp4"):
    try:
        # List all MP3 files in the chunks folder
        if not os.path.exists(chunks_folder):
            return "Error: Chunks folder does not exist."

        music_files = [os.path.join(chunks_folder, f) for f in os.listdir(chunks_folder) if f.endswith('.mp3')]
        if not music_files:
            return "Error: No audio files found in the chunks folder."

        # Randomly select one MP3 file
        music_file_path = random.choice(music_files)
        print(f"Selected music file: {music_file_path}")

        # Get the duration of the video
        video_info = ffmpeg.probe(video_path)
        video_duration = float(video_info['streams'][0]['duration'])
        print(f"Video duration: {video_duration} seconds")

        # Trim the music file to match the video duration
        trimmed_music_path = "trimmed_music.mp3"
        ffmpeg.input(music_file_path).output(
            trimmed_music_path, ss=0, t=video_duration
        ).run(overwrite_output=True)
        print(f"Trimmed music saved at: {trimmed_music_path}")

        # Combine video and audio
        video_input = ffmpeg.input(video_path)
        audio_input = ffmpeg.input(trimmed_music_path)
        ffmpeg.concat(video_input, audio_input, v=1, a=1).output(
            output_path, vcodec="libx264", acodec="aac", strict="experimental"
        ).run(overwrite_output=True)
        print(f"Output video saved at: {output_path}")

        return output_path
    except Exception as e:
        print("Error during processing:", e)
        traceback.print_exc()
        return f"Error: {str(e)}"

# Define Gradio interface
def process_video(uploaded_video):
    try:
        print("Video received for processing.")
        video_path = uploaded_video.name
        print(f"Uploaded video path: {video_path}")
        output_video = add_music_to_video(video_path, chunks_folder="/content/chunks")
        if "Error" in output_video:
            return output_video
        return output_video
    except Exception as e:
        print("Error in process_video:", e)
        traceback.print_exc()
        return f"Error: {str(e)}"

# Gradio Interface
interface = gr.Interface(
    fn=process_video,
    inputs=gr.Video(label="Upload Video"),
    outputs=gr.Video(label="Video with Background Music"),
    title="Add Background Music to Video",
    description="Upload a video, and this app will add a background music track that matches the video duration."
)

# Launch Gradio app
interface.launch(share=True, debug=True)