"""
Edge module
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2020 Project Author Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
Contributor Milad milad.aghamohamadnia@concordia.ca
"""

from typing import List, TypeVar

Node = TypeVar['Node']
Lane = TypeVar['Lane']


class Edge:
  """
  Edge class
  Each edge is unidirectional and starts at the "from" node and ends at the "to" node
  """

  def __init__(self):
    self._id = None
    self._from_node = None
    self._to_node = None
    self._type = None
    self._lanes = None
    self._number_lanes = None
    self._priority = None
    self._speed = None
    self._length = None

  @property
  def id(self):
    """
    Edge id
    :return: str
    """
    return self._id

  @id.setter
  def id(self, value):
    """
    Edge id setter
    :param value: str
    """
    self._id = value

  @property
  def from_node(self) -> Node:
    """
    Starting node
    :return: Node
    """
    return self._from_node

  @from_node.setter
  def from_node(self, value):
    """
    Starting node setter
    :param value: Node
    """
    self._from_node = value

  @property
  def to_node(self) -> Node:
    """
    Ending node
    :return: Node
    """
    return self._to_node

  @to_node.setter
  def to_node(self, value):
    """
    Ending node setter
    :param value: Node
    """
    self._to_node = value

  @property
  def type(self):
    """
    The name of a type within the SUMO edge type file
    :return: str
    """
    return self._type

  @type.setter
  def type(self, value):
    """
    Type setter
    :param value: str
    """
    self._type = value

  @property
  def lanes(self) -> List[Lane]:
    """
    List of lanes on an edge
    :return: List[Lane]
    """
    return self._lanes

  @lanes.setter
  def lanes(self, value):
    """
    List of lanes on an edge setter
    :param value: List[Lane]
    """
    self._lanes = value

  @property
  def number_lanes(self):
    """
    Number of default lanes on an edge
    :return: int
    """
    if self._number_lanes is None:
      self._number_lanes = len(self.lanes)
    return self._number_lanes

  @property
  def priority(self):
    """
    A number, which determines the priority between different road types.
    It starts with one; higher numbers represent more important roads.
    :return: int
    """
    return self._priority

  @priority.setter
  def priority(self, value):
    """
    Priority setter
    :param value: int
    """
    self._priority = value

  @property
  def speed(self):
    """
    The speed limit in m/s
    :return: float
    """
    return self._speed

  @speed.setter
  def speed(self, value):
    """
    The speed limit in m/s setter
    :param value: float
    """
    self._speed = value

  @property
  def length(self):
    """
    Length in m
    :return: float
    """
    return self._length

  @length.setter
  def length(self, value):
    """
    Length in m setter
    :param value: float
    """
    self._length = value