import math
from Empty import Empty
from Package import Package
from Shelf import Shelf


class Finding_fields:
    def __init__(self, enviroment_2d):
        self.enviroment_2d = enviroment_2d

    def find_closest_shelf(self, start_field, type):
        shelves = []
        for row in self.enviroment_2d:
            for field in row:
                if isinstance(field,Shelf):
                    shelves.append(field)
        min_distance = math.inf
        closest_shelf = None
        for shelf in shelves:
            if shelf.type == type:
                distance = abs(start_field.x - shelf.x) + abs(start_field.y - shelf.y)
                if distance < min_distance:
                    min_distance = distance
                    closest_shelf = shelf
        return closest_shelf

    def find_package(self):
        for row in self.enviroment_2d:
            for field in row:
                if isinstance(field,Package) and not field.is_placed:
                    return field