# -*-coding:Utf-8 -*

# Copyright (c) 2013 LE GOFF Vincent
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"""Fichier contenant la classe Trajet, détaillée plus bas."""

from collections import OrderedDict

from abstraits.obase import BaseObj

class Trajet(BaseObj):

    """Classe représentant un trajet maritime entre deux points.

    Un trajet est une suite de points (deux au minimum). Le premier
    est le point de départ, le dernier est l'arrivée, les points
    intermédiaires sont les points intermédiaires entre le point de
    départ et l'arrivée. Ces points doivent être sélectionnés de telle
    sorte qu'aucun obstacle prévisible (côte ou obstacle) n'empêche de
    faire la ligne directe entre deux points.

    """

    enregistrer = True
    def __init__(self, cle):
        """Constructeur du trajet."""
        BaseObj.__init__(self)
        self.cle = cle
        self.etendue = None
        self.point_depart = None
        self.points = OrderedDict()

    def __getnewargs__(self):
        return ("inconnu", )

    def __repr__(self):
        return "<Trajet {}>".format(repr(self.cle))

    def __str__(self):
        return self.cle

    @property
    def point_arrivee(self):
        """Retourne le point d'arrivée."""
        return list(self.points.values())[-1]

    def ajouter_point(self, depuis, vers):
        """Ajoute le point entre depuis et vers.

        Ces deux paramètres doivent être des tuple (x, y).

        """
        if self.point_depart is None:
            raise ValueError("Ce trajet n'a aucun point de départ défini")

        self.points[depuis] = vers
