import os
from pathlib import Path

from PIL import Image
import torch
import torch.backends.cudnn as cudnn
from numpy import random

from models.experimental import attempt_load
from utils.datasets import LoadImages
from utils.general import (non_max_suppression, scale_coords, xyxy2xywh)
from utils.torch_utils import select_device

import gradio as gr
import huggingface_hub

from crop import crop

class FaceCrop:
    def __init__(self):
        self.device = select_device()
        self.half = self.device.type != 'cpu'
        self.results = []
    
    def load_dataset(self, source):
        self.source = source
        self.dataset = LoadImages(source)
        print(f'Successfully load {source}')
    
    def load_model(self, model):
        self.model = attempt_load(model, map_location=self.device)
        if self.half:
            self.model.half()
        print(f'Successfully load model weights from {model}')
    
    def set_crop_config(self, target_size, mode=0, face_ratio=3, threshold=1.5):
        self.target_size = target_size
        self.mode = mode
        self.face_ratio = face_ratio
        self.threshold = threshold
    
    def info(self):
        attributes = dir(self)
        for attribute in attributes:
            if not attribute.startswith('__') and not callable(getattr(self, attribute)):
                value = getattr(self, attribute)
                print(attribute, " = ", value)
    
    def process(self):
        for path, img, im0s, vid_cap in self.dataset:
            img = torch.from_numpy(img).to(self.device)
            img = img.half() if self.half else img.float()  # uint8 to fp16/32
            img /= 255.0  # 0 - 255 to 0.0 - 1.0
            if img.ndimension() == 3:
                img = img.unsqueeze(0)

            # Inference
            pred = self.model(img, augment=False)[0]

            # Apply NMS
            pred = non_max_suppression(pred)

            # Process detections
            for i, det in enumerate(pred):  # detections per image

                p, s, im0 = path, '', im0s
                
                #txt_path = str(Path(out) / Path(p).stem)
                s += '%gx%g ' % img.shape[2:]  # print string
                gn = torch.tensor(im0.shape)[[1, 0, 1, 0]]  # normalization gain whwh

                if det is not None and len(det):
                    # Rescale boxes from img_size to im0 size
                    det[:, :4] = scale_coords(img.shape[2:], det[:, :4], im0.shape).round()

                    # Write results
                    for *xyxy, conf, cls in det:
                        if conf > 0.6:  # Write to file                         
                            x, y, w, h = (xyxy2xywh(torch.tensor(xyxy).view(1, 4)) / gn).view(-1).tolist()
                            self.results.append(crop(self.source, (x, y), mode=self.mode, size=self.target_size, box=(w, h), face_ratio=self.face_ratio, shreshold=self.threshold))
                            
def run(img, mode, width, height, face_ratio, threshold):
    face_crop_pipeline.results = []
    face_crop_pipeline.load_dataset(img)
    face_crop_pipeline.set_crop_config(mode=mode, target_size=(width,height), face_ratio=face_ratio, threshold=threshold)
    face_crop_pipeline.process()
    return face_crop_pipeline.results

if __name__ == '__main__':
    model_path = huggingface_hub.hf_hub_download("Carzit/yolo5x_anime", "yolov5x_anime.pt")
    face_crop_pipeline = FaceCrop()
    face_crop_pipeline.load_model(model_path)
    
    app = gr.Blocks()
    with app:
        gr.Markdown("# Face Crop Anime")
        with gr.Row():
            input_img = gr.Image(label="Input Image", image_mode="RGB", type='filepath')
            output_img = gr.Gallery(label="Cropped Image")
            
        with gr.Row():
            crop_mode = gr.Dropdown(['Auto', 'No Scale', 'Full Screen', 'Fixed Face Propotion'], label="Crop Mode", value='Auto', type='index')
            tgt_width = gr.Slider(32, 2048, value=512, label="Width")
            tgt_height = gr.Slider(32, 2048, value=512, label="Height")

        with gr.Row():
            face_ratio = gr.Slider(1, 5, step=0.1, value=2, label="Face Ratio", info="Necessary if choosing \'Auto\' or 'Fixed Face Propotion' Mode")
            threshold = gr.Slider(1, 5, step=0.1, value=1.5, label="Threshold", info="Necessary if choosing \'Auto\' Mode")
            run_btn = gr.Button(variant="primary")
        
        with gr.Row():
            examples_data = [["examples/Eda.png"],["examples/Chtholly.png"],["examples/Fairies.png"]]
            examples = gr.Examples(examples=examples_data,
                                   inputs=input_img)
        run_btn.click(run, [input_img, crop_mode, tgt_width, tgt_height, face_ratio, threshold], [output_img])
        

    app.launch()