import argparse
import gradio as gr
import numpy as np
import torch
from PIL import Image
import constants
import utils
from ldm.util import instantiate_from_config
from omegaconf import OmegaConf
from zipfile import ZipFile
import os
import requests
import shutil

def download_model(url):
    os.makedirs("models", exist_ok=True)
    local_filename = url.split('/')[-1]
    with requests.get(url, stream=True) as r:
        with open(os.path.join("models", local_filename), 'wb') as file:
            shutil.copyfileobj(r.raw, file)
    with ZipFile("models/gqa_inpaint.zip", 'r') as zObject:
        zObject.extractall(path="models/")
    os.remove("models/gqa_inpaint.zip")
    
MODEL = None

def inference(image: np.ndarray, instruction: str, center_crop: bool):
    if not instruction.lower().startswith("remove the"):
        raise gr.Error("Instruction should start with 'Remove the' !")
    image = Image.fromarray(image)
    cropped_image, image = utils.preprocess_image(image, center_crop=center_crop)
    output_image = MODEL.inpaint(image, instruction, num_steps=100, device="cuda", return_pil=True, seed=0)
    return cropped_image, output_image

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--config",
        type=str,
        default="configs/latent-diffusion/gqa-inpaint-ldm-vq-f8-256x256.yaml",
        help="Path of the model config file",
    )
    parser.add_argument(
        "--checkpoint",
        type=str,
        default="models/gqa_inpaint/ldm/model.ckpt",
        help="Path of the model checkpoint file",
    )
    args = parser.parse_args()

    print("## Downloading the model file")
    download_model("https://huggingface.co/abyildirim/inst-inpaint-models/resolve/main/gqa_inpaint.zip")
    print("## Download is completed")

    print("## Running the demo")
    parsed_config = OmegaConf.load(args.config)
    MODEL = instantiate_from_config(parsed_config["model"])
    model_state_dict = torch.load(args.checkpoint, map_location="cpu")["state_dict"]
    MODEL.load_state_dict(model_state_dict)
    MODEL.eval()
    MODEL.to("cuda")

    sample_image, sample_instruction, sample_step = constants.EXAMPLES[3]

    gr.Interface(
        fn=inference,
        inputs=[
            gr.Image(type="numpy", value=sample_image, label="Source Image").style(
                height=256
            ),
            gr.Textbox(
                label="Instruction",
                lines=1,
                value=sample_instruction,
            ),
            gr.Checkbox(value=True, label="Center Crop", interactive=False),
        ],
        outputs=[
            gr.Image(type="pil", label="Cropped Image").style(height=256),
            gr.Image(type="pil", label="Output Image").style(height=256),
        ],
        allow_flagging="never",
        examples=constants.EXAMPLES,
        cache_examples=True,
        title=constants.TITLE,
        description=constants.DESCRIPTION,
    ).launch()