import glob
import os
from typing import List
import numpy as np


class AnnotationRect:
    """Exercise 3.1"""

    def __init__(self, x1, y1, x2, y2):
        self.x1 = x1
        self.x2 = x2
        self.y1 = y1
        self.y2 = y2

    def area(self):
        return (self.x2 - self.x1) * (self.y2 - self.y1)

    def __array__(self) -> np.ndarray:
        return np.array([self.x1, self.y1, self.x2, self.y2])

    @staticmethod
    def fromarray(arr: np.ndarray):
        return AnnotationRect(arr[0], arr[1], arr[2], arr[3])


def read_groundtruth_file(path: str) -> List[AnnotationRect]:
    """Exercise 3.1b"""
    annotationRects = []
    with open(path, 'r') as file:
        for line in file:
            if line.strip():
                values = line.strip().split()
                annotationRects.append(AnnotationRect(float(values[0]), float(
                    values[1]), float(values[2]), float(values[3])))
    return annotationRects