import gradio as gr
from loadimg import load_img
import spaces
from transformers import AutoModelForImageSegmentation
import torch
from torchvision import transforms
import moviepy.editor as mp
from pydub import AudioSegment
from PIL import Image
import numpy as np
import os
import tempfile
import uuid

torch.set_float32_matmul_precision(["high", "highest"][0])

birefnet = AutoModelForImageSegmentation.from_pretrained(
    "ZhengPeng7/BiRefNet", trust_remote_code=True
)
birefnet.to("cuda")
transform_image = transforms.Compose(
    [
        transforms.Resize((1024, 1024)),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]),
    ]
)

@spaces.GPU
def fn(vid):
    # Load the video using moviepy
    video = mp.VideoFileClip(vid)

    # Extract audio from the video
    audio = video.audio

    # Extract frames at 12 fps
    frames = video.iter_frames(fps=12)

    # Process each frame for background removal
    processed_frames = []
    for frame in frames:
        pil_image = Image.fromarray(frame)
        processed_image = process(pil_image)
        processed_frames.append(np.array(processed_image))

    # Create a new video from the processed frames
    processed_video = mp.ImageSequenceClip(processed_frames, fps=12)

    # Add the original audio back to the processed video
    processed_video = processed_video.set_audio(audio)

    # Save the processed video to a temporary file
    temp_dir = "temp"
    os.makedirs(temp_dir, exist_ok=True)
    unique_filename = str(uuid.uuid4()) + ".mp4"
    temp_filepath = os.path.join(temp_dir, unique_filename)
    processed_video.write_videofile(temp_filepath, codec="libx264")

    # Return the path to the temporary file
    return temp_filepath


def process(image):
    image_size = image.size
    input_images = transform_image(image).unsqueeze(0).to("cuda")
    # Prediction
    with torch.no_grad():
        preds = birefnet(input_images)[-1].sigmoid().cpu()
    pred = preds[0].squeeze()
    pred_pil = transforms.ToPILImage()(pred)
    mask = pred_pil.resize(image_size)

    # Create a green screen image
    green_screen = Image.new("RGBA", image_size, (0, 255, 0, 255))

    # Composite the image onto the green screen using the mask
    image = Image.composite(image, green_screen, mask)

    return image


def process_file(f):
    name_path = f.rsplit(".", 1)[0] + ".png"
    im = load_img(f, output_type="pil")
    im = im.convert("RGB")
    transparent = process(im)
    transparent.save(name_path)
    return name_path


in_video = gr.Video(label="birefnet")
out_video = gr.Video()


demo = gr.Interface(
    fn, inputs=in_video, outputs=out_video, api_name="video"
)


if __name__ == "__main__":
    demo.launch(show_error=True)