# ------------------------------------------------------------------------
# Modified from Grounded-SAM (https://github.com/IDEA-Research/Grounded-Segment-Anything)
# ------------------------------------------------------------------------
import os
import sys
import random
import warnings

os.system("export BUILD_WITH_CUDA=True")
os.system("python -m pip install -e segment-anything")
os.system("python -m pip install -e GroundingDINO")
os.system("pip install --upgrade diffusers[torch]")
#os.system("pip install opencv-python pycocotools matplotlib")
sys.path.insert(0, './GroundingDINO')
sys.path.insert(0, './segment-anything')
warnings.filterwarnings("ignore")

import cv2
from scipy import ndimage

import gradio as gr
import argparse

import numpy as np
from PIL import Image
from moviepy.editor import *
import torch
from torch.nn import functional as F
import torchvision
import networks
import utils

# Grounding DINO
from groundingdino.util.inference import Model

# SAM
from segment_anything.utils.transforms import ResizeLongestSide

# SD
from diffusers import StableDiffusionPipeline

transform = ResizeLongestSide(1024)
# Green Screen
PALETTE_back = (51, 255, 146)

GROUNDING_DINO_CONFIG_PATH = "GroundingDINO/groundingdino/config/GroundingDINO_SwinT_OGC.py"
GROUNDING_DINO_CHECKPOINT_PATH = "checkpoints/groundingdino_swint_ogc.pth"
mam_checkpoint="checkpoints/mam_sam_vitb.pth"
output_dir="outputs"
device = 'cuda'
background_list = os.listdir('assets/backgrounds')

#groundingdino_model = None
#mam_predictor = None
#generator = None

# initialize MAM
mam_model = networks.get_generator_m2m(seg='sam', m2m='sam_decoder_deep')
mam_model.to(device)
checkpoint = torch.load(mam_checkpoint, map_location=device)
mam_model.load_state_dict(utils.remove_prefix_state_dict(checkpoint['state_dict']), strict=True)
mam_model = mam_model.eval()

# initialize GroundingDINO
grounding_dino_model = Model(model_config_path=GROUNDING_DINO_CONFIG_PATH, model_checkpoint_path=GROUNDING_DINO_CHECKPOINT_PATH, device=device)

# initialize StableDiffusionPipeline
generator = StableDiffusionPipeline.from_pretrained("checkpoints/stable-diffusion-v1-5", torch_dtype=torch.float16)
generator.to(device)

def get_frames(video_in):
    frames = []
    #resize the video
    clip = VideoFileClip(video_in)
    
    #check fps
    if clip.fps > 30:
        print("vide rate is over 30, resetting to 30")
        clip_resized = clip.resize(height=512)
        clip_resized.write_videofile("video_resized.mp4", fps=30)
    else:
        print("video rate is OK")
        clip_resized = clip.resize(height=512)
        clip_resized.write_videofile("video_resized.mp4", fps=clip.fps)
    
    print("video resized to 512 height")
    
    # Opens the Video file with CV2
    cap= cv2.VideoCapture("video_resized.mp4")
    
    fps = cap.get(cv2.CAP_PROP_FPS)
    print("video fps: " + str(fps))
    i=0
    while(cap.isOpened()):
        ret, frame = cap.read()
        if ret == False:
            break
        cv2.imwrite('kang'+str(i)+'.jpg',frame)
        frames.append('kang'+str(i)+'.jpg')
        i+=1
    
    cap.release()
    cv2.destroyAllWindows()
    print("broke the video into frames")
    
    return frames, fps


def create_video(frames, fps):
    print("building video result")
    clip = ImageSequenceClip(frames, fps=fps)
    clip.write_videofile("movie.mp4", fps=fps)
    
    return 'movie.mp4'


def run_grounded_sam(input_image, text_prompt, task_type, background_prompt):
    background_type = "generated_by_text"
    box_threshold = 0.25
    text_threshold = 0.25
    iou_threshold = 0.5
    scribble_mode = "split"
    guidance_mode = "alpha"
    
    #global groundingdino_model, sam_predictor, generator

    # make dir
    os.makedirs(output_dir, exist_ok=True)

    #if mam_predictor is None:
        # initialize MAM
        # build model
    #    mam_model = networks.get_generator_m2m(seg='sam', m2m='sam_decoder_deep')
    #    mam_model.to(device)

        # load checkpoint
    #    checkpoint = torch.load(mam_checkpoint, map_location=device)
    #    mam_model.load_state_dict(utils.remove_prefix_state_dict(checkpoint['state_dict']), strict=True)

        # inference
    #    mam_model = mam_model.eval()

    #if groundingdino_model is None:
    #    grounding_dino_model = Model(model_config_path=GROUNDING_DINO_CONFIG_PATH, model_checkpoint_path=GROUNDING_DINO_CHECKPOINT_PATH, device=device)

    #if generator is None:
    #    generator = StableDiffusionPipeline.from_pretrained("runwayml/stable-diffusion-v1-5", torch_dtype=torch.float16)
    #    generator.to(device)

    # load image
    #image_ori = input_image["image"]
    image_ori = input_image
    #scribble = input_image["mask"]
    original_size = image_ori.shape[:2]

    if task_type == 'text':
        if text_prompt is None:
            print('Please input non-empty text prompt')
        with torch.no_grad():
            detections, phrases = grounding_dino_model.predict_with_caption(
                image=cv2.cvtColor(image_ori, cv2.COLOR_RGB2BGR),
                caption=text_prompt,
                box_threshold=box_threshold,
                text_threshold=text_threshold
            )

        if len(detections.xyxy) > 1:
            nms_idx = torchvision.ops.nms(
                torch.from_numpy(detections.xyxy), 
                torch.from_numpy(detections.confidence), 
                iou_threshold,
            ).numpy().tolist()

            detections.xyxy = detections.xyxy[nms_idx]
            detections.confidence = detections.confidence[nms_idx]
    
        bbox = detections.xyxy[np.argmax(detections.confidence)]
        bbox = transform.apply_boxes(bbox, original_size)
        bbox = torch.as_tensor(bbox, dtype=torch.float).to(device)

    image = transform.apply_image(image_ori)
    image = torch.as_tensor(image).to(device)
    image = image.permute(2, 0, 1).contiguous()

    pixel_mean = torch.tensor([123.675, 116.28, 103.53]).view(3,1,1).to(device)
    pixel_std = torch.tensor([58.395, 57.12, 57.375]).view(3,1,1).to(device)

    image = (image - pixel_mean) / pixel_std

    h, w = image.shape[-2:]
    pad_size = image.shape[-2:]
    padh = 1024 - h
    padw = 1024 - w
    image = F.pad(image, (0, padw, 0, padh))

    if task_type == 'scribble_point':
        scribble = scribble.transpose(2, 1, 0)[0]
        labeled_array, num_features = ndimage.label(scribble >= 255)
        centers = ndimage.center_of_mass(scribble, labeled_array, range(1, num_features+1))
        centers = np.array(centers)
        ### (x,y)
        centers = transform.apply_coords(centers, original_size)
        point_coords = torch.from_numpy(centers).to(device)
        point_coords = point_coords.unsqueeze(0).to(device)
        point_labels = torch.from_numpy(np.array([1] * len(centers))).unsqueeze(0).to(device)
        if scribble_mode == 'split':
            point_coords = point_coords.permute(1, 0, 2)
            point_labels = point_labels.permute(1, 0)
            
        sample = {'image': image.unsqueeze(0), 'point': point_coords, 'label': point_labels, 'ori_shape': original_size, 'pad_shape': pad_size}
    elif task_type == 'scribble_box':
        scribble = scribble.transpose(2, 1, 0)[0]
        labeled_array, num_features = ndimage.label(scribble >= 255)
        centers = ndimage.center_of_mass(scribble, labeled_array, range(1, num_features+1))
        centers = np.array(centers)
        ### (x1, y1, x2, y2)
        x_min = centers[:, 0].min()
        x_max = centers[:, 0].max()
        y_min = centers[:, 1].min()
        y_max = centers[:, 1].max()
        bbox = np.array([x_min, y_min, x_max, y_max])
        bbox = transform.apply_boxes(bbox, original_size)
        bbox = torch.as_tensor(bbox, dtype=torch.float).to(device)

        sample = {'image': image.unsqueeze(0), 'bbox': bbox.unsqueeze(0), 'ori_shape': original_size, 'pad_shape': pad_size}
    elif task_type == 'text':
        sample = {'image': image.unsqueeze(0), 'bbox': bbox.unsqueeze(0), 'ori_shape': original_size, 'pad_shape': pad_size}
    else:
        print("task_type:{} error!".format(task_type))

    with torch.no_grad():
        feas, pred, post_mask = mam_model.forward_inference(sample)

        alpha_pred_os1, alpha_pred_os4, alpha_pred_os8 = pred['alpha_os1'], pred['alpha_os4'], pred['alpha_os8']
        alpha_pred_os8 = alpha_pred_os8[..., : sample['pad_shape'][0], : sample['pad_shape'][1]]
        alpha_pred_os4 = alpha_pred_os4[..., : sample['pad_shape'][0], : sample['pad_shape'][1]]
        alpha_pred_os1 = alpha_pred_os1[..., : sample['pad_shape'][0], : sample['pad_shape'][1]]

        alpha_pred_os8 = F.interpolate(alpha_pred_os8, sample['ori_shape'], mode="bilinear", align_corners=False)
        alpha_pred_os4 = F.interpolate(alpha_pred_os4, sample['ori_shape'], mode="bilinear", align_corners=False)
        alpha_pred_os1 = F.interpolate(alpha_pred_os1, sample['ori_shape'], mode="bilinear", align_corners=False)
        
        if guidance_mode == 'mask':
            weight_os8 = utils.get_unknown_tensor_from_mask_oneside(post_mask, rand_width=10, train_mode=False)
            post_mask[weight_os8>0] = alpha_pred_os8[weight_os8>0]
            alpha_pred = post_mask.clone().detach()
        else:
            weight_os8 = utils.get_unknown_box_from_mask(post_mask)
            alpha_pred_os8[weight_os8>0] = post_mask[weight_os8>0]
            alpha_pred = alpha_pred_os8.clone().detach()


        weight_os4 = utils.get_unknown_tensor_from_pred_oneside(alpha_pred, rand_width=20, train_mode=False)
        alpha_pred[weight_os4>0] = alpha_pred_os4[weight_os4>0]
        
        weight_os1 = utils.get_unknown_tensor_from_pred_oneside(alpha_pred, rand_width=10, train_mode=False)
        alpha_pred[weight_os1>0] = alpha_pred_os1[weight_os1>0]
       
        alpha_pred = alpha_pred[0][0].cpu().numpy()

    #### draw
    ### alpha matte
    alpha_rgb = cv2.cvtColor(np.uint8(alpha_pred*255), cv2.COLOR_GRAY2RGB)
    ### com img with background
    if background_type == 'real_world_sample':
        background_img_file = os.path.join('assets/backgrounds', random.choice(background_list))
        background_img = cv2.imread(background_img_file)
        background_img = cv2.cvtColor(background_img, cv2.COLOR_BGR2RGB)
        background_img = cv2.resize(background_img, (image_ori.shape[1], image_ori.shape[0]))
        com_img = alpha_pred[..., None] * image_ori + (1 - alpha_pred[..., None]) * np.uint8(background_img)
        com_img = np.uint8(com_img)
    else:
        if background_prompt is None:
            print('Please input non-empty background prompt')
        else:
            background_img = generator(background_prompt).images[0]
            background_img = np.array(background_img)
            background_img = cv2.resize(background_img, (image_ori.shape[1], image_ori.shape[0]))
            com_img = alpha_pred[..., None] * image_ori + (1 - alpha_pred[..., None]) * np.uint8(background_img)
            com_img = np.uint8(com_img)
    ### com img with green screen
    green_img = alpha_pred[..., None] * image_ori + (1 - alpha_pred[..., None]) * np.array([PALETTE_back], dtype='uint8')
    green_img = np.uint8(green_img)
    #return [(com_img, 'composite with background'), (green_img, 'green screen'), (alpha_rgb, 'alpha matte')]
    return com_img, alpha_rgb

def infer(video_in, trim_value, prompt, background_prompt):
    print(prompt)
    break_vid = get_frames(video_in)
    
    frames_list= break_vid[0]
    fps = break_vid[1]
    n_frame = int(trim_value*fps)
    
    if n_frame >= len(frames_list):
        print("video is shorter than the cut value")
        n_frame = len(frames_list)
    
    with_bg_result_frames = []
    with_green_result_frames = []
    with_matte_result_frames = []
    
    print("set stop frames to: " + str(n_frame))
    
    for i in frames_list[0:int(n_frame)]:
        to_numpy_i = Image.open(i).convert("RGB")
        #need to convert to numpy
        # Convert the image to a NumPy array
        image_array = np.array(to_numpy_i)

        results = run_grounded_sam(image_array, prompt, "text", background_prompt)

        bg_img = Image.fromarray(results[0])
        greem_img = Image.fromarray(results[1])
        matte_img = Image.fromarray(results[2])
        
  
        # exporting the images
        bg_img.save(f"bg_result_img-{i}.jpg")
        with_bg_result_frames.append(f"bg_result_img-{i}.jpg")
        green_img.save(f"green_result_img-{i}.jpg")
        with_green_result_frames.append(f"green_result_img-{i}.jpg")
        matte_img.save(f"matte_result_img-{i}.jpg")
        with_matte_result_frames.append(f"matte_result_img-{i}.jpg")
        print("frame " + i + "/" + str(n_frame) + ": done;")

    vid_bg = create_video(with_bg_result_frames, fps)
    vid_green = create_video(with_green_result_frames, fps)
    vid_matte = create_video(with_matte_result_frames, fps)
    print("finished !")
    
    return vid_bg, vid_green, vid_matte

if __name__ == "__main__":
    parser = argparse.ArgumentParser("MAM 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")
    parser.add_argument('--port', type=int, default=7589, help='port to run the server')
    parser.add_argument('--no-gradio-queue', action="store_true", help='path to the SAM checkpoint')
    args = parser.parse_args()

    print(args)

    block = gr.Blocks()
    if not args.no_gradio_queue:
        block = block.queue()

    with block:
        gr.Markdown(
        """
        # Matting Anything in Video Demo
        Welcome to the Matting Anything in Video demo and upload your video to get started <br/> 
        You may open usage details below to understand how to use this demo.
        ## Usage
        <details>
        You may upload a video to start, for the moment we only support 1 prompt type to get the alpha matte of the target: 
        **text**: Send text prompt to identify the target instance in the `Text prompt` box.

        We also only support 1 background type to support image composition with the alpha matte output:
        **generated_by_text**: Send background text prompt to create a background image with stable diffusion model in the `Background prompt` box.

        </details>
        """)
   
        with gr.Row():
            with gr.Column():
                video_in = gr.Video(source='upload', type="filepath")
                trim_in = gr.Slider(label="Cut video at (s)", minimun=1, maximum=5, step=1, value=1)
                #task_type = gr.Dropdown(["scribble_point", "scribble_box", "text"], value="text", label="Prompt type")
                #task_type = "text"
                text_prompt = gr.Textbox(label="Text prompt", placeholder="the girl in the middle", info="Describe the subject visible in your video that you want to matte")
                #background_type = gr.Dropdown(["generated_by_text", "real_world_sample"], value="generated_by_text", label="Background type")
                background_prompt = gr.Textbox(label="Background prompt", placeholder="downtown area in New York")
                
                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=0.05
                #   )
                #   text_threshold = gr.Slider(
                #       label="Text Threshold", minimum=0.0, maximum=1.0, value=0.25, step=0.05
                #   )
                #   iou_threshold = gr.Slider(
                #       label="IOU Threshold", minimum=0.0, maximum=1.0, value=0.5, step=0.05
                #   )
                #   scribble_mode = gr.Dropdown(
                #       ["merge", "split"], value="split", label="scribble_mode"
                #   )
                #   guidance_mode = gr.Dropdown(
                #       ["mask", "alpha"], value="alpha", label="guidance_mode", info="mask guidance is for complex scenes with multiple instances, alpha guidance is for simple scene with single instance"
                #   )

            with gr.Column():
                #gallery = gr.Gallery(
                #    label="Generated images", show_label=True, elem_id="gallery"
                #).style(preview=True, grid=3, object_fit="scale-down")
                vid_bg_out = gr.Video(label="Video with background")
                vid_green_out = gr.Video(label="Video green screen")
                vid_matte_out = gr.Video(label="Video matte")

        run_button.click(fn=infer, inputs=[
                        video_in, trim_in, text_prompt, background_prompt], outputs=[vid_bg_out, vid_green_out, vid_matte_out])

    block.queue(max_size=12).launch(debug=args.debug, share=args.share, show_error=True)
    #block.queue(concurrency_count=100)
    #block.launch(server_name='0.0.0.0', server_port=args.port, debug=args.debug, share=args.share)