import argparse
from functools import partial
import cv2
import os
from io import BytesIO
from PIL import Image
import numpy as np
from pathlib import Path
import gradio as gr

import warnings

import torch
warnings.filterwarnings("ignore")

# grounding DINO
from groundingdino.models import build_model
from groundingdino.util.slconfig import SLConfig
from groundingdino.util.utils import clean_state_dict
from groundingdino.util.inference import annotate, load_image, predict
import groundingdino.datasets.transforms as T

from huggingface_hub import hf_hub_download

os.environ["CUDA_VISIBLE_DEVICES"] = "0"


# Use this command for evaluate the GLIP-T model
config_file = "groundingdino/config/GroundingDINO_SwinT_OGC.py"
ckpt_repo_id = "ShilongLiu/GroundingDINO"
ckpt_filename = "groundingdino_swint_ogc.pth"
groundingdino_device = 'cpu'
device = 'cuda' if torch.cuda.is_available() else 'cpu'


def load_model_hf(model_config_path, repo_id, filename, device='cpu'):
    args = SLConfig.fromfile(model_config_path) 
    model = build_model(args)
    args.device = device

    cache_file = hf_hub_download(repo_id=repo_id, filename=filename)
    checkpoint = torch.load(cache_file, map_location='cpu')
    log = model.load_state_dict(clean_state_dict(checkpoint['model']), strict=False)
    print("Model loaded from {} \n => {}".format(cache_file, log))
    _ = model.eval()
    return model    

def image_transform_grounding(init_image):
    transform = T.Compose([
        T.RandomResize([800], max_size=1333),
        T.ToTensor(),
        T.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
    ])
    image, _ = transform(init_image, None) # 3, h, w
    return init_image, image

def image_transform_grounding_for_vis(init_image):
    transform = T.Compose([
        T.RandomResize([800], max_size=1333),
    ])
    image, _ = transform(init_image, None) # 3, h, w
    return image

model = load_model_hf(config_file, ckpt_repo_id, ckpt_filename, groundingdino_device)

def get_grounding_box(input_image, grounding_caption, box_threshold, text_threshold):
    init_image = input_image.convert("RGB")
    original_size = init_image.size

    _, image_tensor = image_transform_grounding(init_image)
    image_pil: Image = image_transform_grounding_for_vis(init_image)

    # run grounding
    boxes, logits, phrases = predict(model, image_tensor, grounding_caption, box_threshold, text_threshold, device=groundingdino_device)
    annotated_frame = annotate(image_source=np.asarray(image_pil), boxes=boxes, logits=logits, phrases=phrases)
    image_with_box = Image.fromarray(cv2.cvtColor(annotated_frame, cv2.COLOR_BGR2RGB))


    return image_with_box

if __name__ == "__main__":

    parser = argparse.ArgumentParser("Grounding SAM demo", add_help=True)
    parser.add_argument("--debug", action="store_true", help="using debug mode")
    parser.add_argument("--share", action="store_true", help="share the app")
    args = parser.parse_args()

    print(f'args = {args}')

    block = gr.Blocks().queue()
    with block:
        gr.Markdown("# [Grounding SAM Playground]")
        with gr.Row():
            with gr.Column():
                input_image = gr.Image(source='upload', type="pil")
                grounding_caption = gr.Textbox(label="Detection Prompt")
                run_button = gr.Button(label="Run")
                with gr.Accordion("Advanced options", open=False):
                    box_threshold = gr.Slider(
                        label="Box Threshold", minimum=0.0, maximum=1.0, value=0.25, step=0.001
                    )
                    text_threshold = gr.Slider(
                        label="Text Threshold", minimum=0.0, maximum=1.0, value=0.25, step=0.001
                    )

            with gr.Column():
                gallery = gr.outputs.Image(
                    type="pil",
                    # label="grounding results"
                ).style(full_width=True, full_height=True)
                # gallery = gr.Gallery(label="Generated images", show_label=False).style(
                #         grid=[1], height="auto", container=True, full_width=True, full_height=True)
        
        DESCRIPTION = '### This demo from [Grounded-Segment-Anything](https://github.com/IDEA-Research/Grounded-Segment-Anything) and kudos to thier excellent works. Welcome everyone to try this out and learn together!'
        gr.Markdown(DESCRIPTION)
        run_button.click(fn=get_grounding_box, inputs=[
                        input_image, grounding_caption, box_threshold, text_threshold], outputs=[gallery])

    block.launch(share=False, show_api=False, show_error=True)