import os.path
import time
from pathlib import Path
import albumentations as A
import cv2
from constants import current_images_dir, current_labels_dir, annotation_classes
from dto.imageLabel import ImageLabel

labels_dir = 'labels'
images_dir = 'images'


def image_processing(img_ann: ImageLabel) -> [ImageLabel]:
    transforms = [
        A.Compose([A.HorizontalFlip(always_apply=True)],
                  bbox_params=A.BboxParams(format='yolo')),
        A.Compose([A.RandomBrightnessContrast(always_apply=True)],
                  bbox_params=A.BboxParams(format='yolo')),
        A.Compose([A.SafeRotate(limit=90, always_apply=True)],
                  bbox_params=A.BboxParams(format='yolo')),
        A.Compose([A.SafeRotate(limit=90, always_apply=True),
                   A.RandomBrightnessContrast(always_apply=True)],
                  bbox_params=A.BboxParams(format='yolo')),
        A.Compose([A.ShiftScaleRotate(scale_limit=0.2, always_apply=True),
                   A.VerticalFlip(always_apply=True),],
                  bbox_params=A.BboxParams(format='yolo')),
        A.Compose([A.ShiftScaleRotate(scale_limit=0.2, always_apply=True)],
                  bbox_params=A.BboxParams(format='yolo')),
        A.Compose([A.SafeRotate(limit=90, always_apply=True),
                   A.RandomBrightnessContrast(always_apply=True)],
                  bbox_params=A.BboxParams(format='yolo'))
    ]

    results = []
    for i, transform in enumerate(transforms):
        try:
            res = transform(image=img_ann.image, bboxes=img_ann.labels)
            path = Path(img_ann.image_path)
            name = f'{path.stem}_{i+1}'
            img = ImageLabel(
                image=res['image'],
                labels=res['bboxes'],
                image_path=os.path.join(current_images_dir, f'{name}{path.suffix}'),
                labels_path=os.path.join(current_labels_dir, f'{name}.txt')
            )
            results.append(img)
        except Exception as e:
            print(f'Error during transformtation: {e}')
    return results


def write_result(img_ann: ImageLabel, show_image=False):
    os.makedirs(os.path.dirname(img_ann.image_path), exist_ok=True)
    os.makedirs(os.path.dirname(img_ann.labels_path), exist_ok=True)

    if show_image:
        img_ann.visualize(annotation_classes)

    cv2.imwrite(img_ann.image_path, img_ann.image)
    print(f'{img_ann.image_path} written')

    with open(img_ann.labels_path, 'w') as f:
        lines = [f'{ann[4]} {round(ann[0], 5)} {round(ann[1], 5)} {round(ann[2], 5)} {round(ann[3], 5)}\n' for ann in img_ann.labels]
        f.writelines(lines)
        f.close()
    print(f'{img_ann.labels_path} written')


def read_labels(labels_path) -> [[]]:
    with open(labels_path, 'r') as f:
        rows = f.readlines()
        arr = []
        for row in rows:
            str_coordinates = row.split(' ')
            class_num = str_coordinates.pop(0)
            coordinates = [float(n.replace(',', '.')) for n in str_coordinates]
            coordinates.append(class_num)
            arr.append(coordinates)
        return arr


def process_image(img_ann):
    results = image_processing(img_ann)
    for res_ann in results:
        write_result(res_ann)
    write_result(ImageLabel(
        image=img_ann.image,
        labels=img_ann.labels,
        image_path=os.path.join(current_images_dir, Path(img_ann.image_path).name),
        labels_path=os.path.join(current_labels_dir, Path(img_ann.labels_path).name)
    ))
    os.remove(img_ann.image_path)
    os.remove(img_ann.labels_path)


def main():
    while True:
        images = os.listdir(images_dir)
        if len(images) == 0:
            time.sleep(5)
            continue

        for image in images:
            try:
                image_path = os.path.join(images_dir, image)
                labels_path = os.path.join(labels_dir, f'{Path(image_path).stem}.txt')
                process_image(ImageLabel(
                    image_path=image_path,
                    image=cv2.imread(image_path),
                    labels_path=labels_path,
                    labels=read_labels(labels_path)
                ))
            except Exception as e:
                print(f'Error appeared {e}')

                try:
                    os.remove(image_path)
                except OSError:
                    pass

                try:
                    os.remove(labels_path)
                except OSError:
                    pass


if __name__ == '__main__':
    main()