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elevator.py
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elevator.py
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# To be able to type classes defined later in the script
from __future__ import annotations
from typing import Iterator, Optional, List
class Direction:
UP = "UP"
DOWN = "DOWN"
NOWHERE = "NOWHERE"
class Controller:
def __init__(self) -> None:
self.elevators: List[Elevator] = []
def add_elevator(self, elevator: Elevator) -> None:
"""
Adds an elevator to a controller.
"""
self.elevators.append(elevator)
def report_status(self) -> None:
"""
A helper function that prints out useful elevator information.
"""
for elevator in self.elevators:
print(f"{elevator} is at {elevator.floor} floor.")
print(f"{elevator}'s door are open: {elevator.door.is_open}")
print(f"{elevator} is going: {elevator.direction}")
print(
f"People in the {elevator}: {[person.name for person in elevator.people]}"
)
@property
def free_elevators(self) -> List[Elevator]:
if not self.elevators:
raise ValueError("No elevators in this controller")
return [elevator for elevator in self.elevators if elevator.is_free]
def elevator_for(self, person: Person) -> Optional[Elevator]:
"""Return an elevator if it is at the floor"""
for elevator in self.elevators:
if (
elevator.floor == person.enter_floor
and elevator.LOWEST_FLOOR <= person.exit_floor <= elevator.HIGHEST_FLOOR
):
return elevator
return None
def call_elevator_for(self, person: Person) -> Optional[Elevator]:
"""
Moves the 'best' elevator into a called floor.
Returns a True if moved and False if not elevator to be moved.
"""
# Pick an elevator that is the closest and can travel to this floor
best_elevator = None
min_value = float("inf")
for elevator in self.free_elevators:
if (
elevator.LOWEST_FLOOR <= person.enter_floor <= elevator.HIGHEST_FLOOR
and elevator.LOWEST_FLOOR <= person.exit_floor <= elevator.HIGHEST_FLOOR
):
floor_difference = abs(person.enter_floor - elevator.floor)
if floor_difference < min_value:
min_value = floor_difference
best_elevator = elevator
if not best_elevator:
return None
# Send an elevator
best_elevator.move_to(person.enter_floor)
return best_elevator
def move_elevators(self) -> None:
for elevator in self.elevators:
elevator.move()
class Door:
def __init__(self, is_open: bool = False) -> None:
self.is_open: bool = is_open
def open(self) -> None:
self.is_open = True
def close(self) -> None:
self.is_open = False
class Elevator:
COUNTER = 0
def __init__(self, lowest_floor: int, highest_floor: int) -> None:
self.door: Door = Door()
self.floor: int = 0 # Starts from ground level
self.HIGHEST_FLOOR: int = highest_floor
self.LOWEST_FLOOR: int = lowest_floor
self.moving_to: Optional[int] = None # If None it means that the lift is unused
self.people: List[Person] = []
self.validate()
Elevator.COUNTER += 1
self.id = Elevator.COUNTER
def __str__(self) -> str:
return f"Elevator nr.{self.id}"
@property
def is_free(self) -> bool:
return not bool(self.moving_to)
@property
def stops(self) -> List[int]:
"""
Returns a list of floors at which people inside the elevator
want to get out.
"""
return [person.exit_floor for person in self.people]
@property
def direction(self) -> str:
"""
Returns the current direction in which the elvator is
moving or null if not decided yet.
"""
if not self.moving_to:
return Direction.NOWHERE
if self.moving_to > self.floor:
return Direction.UP
if self.moving_to < self.floor:
return Direction.DOWN
else:
return Direction.NOWHERE
@property
def people_leaving(self) -> Iterator[Person]:
"""Returns a list of people leaving at this floor"""
for person in self.people:
if person.exit_floor == self.floor:
yield person
def move_to(self, floor: int) -> None:
self.moving_to = floor
def open_door(self) -> None:
print(f"{self} door have opened")
self.door.open()
def close_door(self) -> None:
print(f"{self} door have closed")
self.door.close()
def move(self) -> None:
"""
Is an action method that should be used in a time frame.
Each invocation represents one tick of time.
"""
if self.door.is_open:
self.close_door()
if stops := self.stop_queue:
self.moving_to = stops[-1]
if self.direction == Direction.UP:
self.up_1()
elif self.direction == Direction.DOWN:
self.down_1()
else:
self.moving_to = None
print(f"{self} is not moving this round")
@property
def stop_queue(self) -> Optional[List[int]]:
"""
A property that represents the stop the current lift will do.
Given people going in different direction it will create a stop
route directed by the earliest request.
"""
def filterUp(floor: int) -> bool:
return floor > self.floor
def filterDown(floor: int) -> bool:
return floor < self.floor
if not self.stops:
return None
oldest_request = self.stops[0]
stop_queue = []
if oldest_request > self.floor:
stop_queue = list(filter(filterUp, self.stops))
elif oldest_request < self.floor:
stop_queue = list(filter(filterDown, self.stops))
return stop_queue
def validate(self) -> None:
if type(self.LOWEST_FLOOR) != int or type(self.LOWEST_FLOOR) != int:
raise ValueError("Invalid lowest floor")
if self.LOWEST_FLOOR > 0:
raise ValueError("Invalid lowest floor")
if self.HIGHEST_FLOOR <= 0:
raise ValueError("Invalid highest floor")
if self.LOWEST_FLOOR >= self.HIGHEST_FLOOR:
raise ValueError("Invalid elevator")
def up_1(self) -> None:
if self.door.is_open:
raise ValueError("Cannot move the elevator if the door is not closed")
if self.floor + 1 > self.HIGHEST_FLOOR:
raise ValueError(f"Can't go higher that the {self.HIGHEST_FLOOR} floor")
self.floor += 1
print(f"{self} moved floors {self.floor -1} -> {self.floor}")
def down_1(self) -> None:
if self.door.is_open:
raise ValueError("Cannot move the elevator if the door is not closed")
if self.floor - 1 < self.LOWEST_FLOOR:
raise ValueError(f"Can't go lower that the {self.LOWEST_FLOOR} floor")
self.floor -= 1
print(f"{self} moved floors {self.floor + 1} -> {self.floor}")
class Person:
COUNTER = 0
def __init__(self, name: str, enter_floor: int, exit_floor: int) -> None:
self.name = name # ID, might need to check if unique
self.enter_floor = int(enter_floor)
self.exit_floor = int(exit_floor)
Person.COUNTER += 1
self.id = Person.COUNTER
def __repr__(self) -> str:
return str(self)
def __str__(self) -> str:
return (
f"<Person id:{self.id} -> {(self.name, self.enter_floor, self.exit_floor)}"
)