CASES_COTE = 8

MVT_INCONNU = 'Cause inconnue'
MVT_OK = 'Valide'
MVT_ROQUE = 'Roque'
MVT_SELECTION = 'Mauvais tour'
MVT_SUR_PLACE = 'Immobile'
MVT_SAUT_AMI = 'Saut ami'
MVT_PION_INC = 'Pion inconnu'
MVT_N_AUTORISE = 'Non-autorisé'
MVT_OBSTRUCTION = 'Pion en chemin'

class LogiqueEchecs:

    def __init__(self):
        self.grille = []
        self.cGrille()
        self.remplirGrille()
        self.joueur = True
        self.nvPartie()

    @staticmethod
    def eNoir(xD, yD):
        return xD % 2 != yD % 2

    def cGrille(self):
        for x in range(CASES_COTE):
            colonne = []
            for y in range(CASES_COTE):
                colonne.append(0)
            self.grille.append(colonne)

    def remplirGrille(self):
        speciales = [2, 3, 4, 6, 5, 4, 3, 2]
        for i in range(0, 8):
            self.grille[i][0] = speciales[i] + 10
            self.grille[i][1] = 11
            self.grille[i][6] = 1
            self.grille[i][7] = speciales[i]

    def nvPartie(self):
        self.cGrille()
        self.remplirGrille()
        self.joueur = True

    def cPion(self, x, y, piece):
        """
        """
        self.grille[x][y] = piece
        return True

    @staticmethod
    def ePionBlanc(pion):
        return pion in range(1, 7)

    @staticmethod
    def ePionNoir(pion):
        return pion in range(11, 17)


    def aSonTour(self, pion):
        return (self.ePionNoir(pion) and self.joueur == False) or \
                (self.ePionBlanc(pion) and self.joueur == True)

    def mvtPossiblePion(self, x1, y1, x2, y2):
        if x1 == x2 and self.grille[x2][y2] <= 0: # Avance
            if self.joueur:
                if y2 == y1 - 1:
                    return MVT_OK
                elif y1 == 6 and y2 == 4 and self.grille[x1][5] == 0:
                    return MVT_OK
                else:
                    return MVT_N_AUTORISE
            else:
                if y2 == y1 + 1:
                    return MVT_OK
                elif y1 == 1 and y2 == 3 and self.grille[x1][2] == 0:
                    return MVT_OK
                else:
                    return MVT_N_AUTORISE
        elif abs(x1-x2) == 1: # Saut
            if self.joueur:
                if y2 == y1 - 1 and \
                self.ePionNoir(self.grille[x2][y2]):
                    return MVT_OK
                else:
                    return MVT_N_AUTORISE
            else:
                if y2 == y1 + 1 and \
                self.ePionBlanc(self.grille[x2][y2]):
                    return MVT_OK
                else:
                    return MVT_N_AUTORISE
        else:
            return MVT_N_AUTORISE

    def mvtPossibleTour(self, x1, y1, x2, y2):
        if y1 == y2:
            sens = (x2-x1)//abs(x2-x1)
            for x in range(x1+sens, x2, sens):
                if self.grille[x][y1] > 0:
                    return MVT_OBSTRUCTION
        elif x1 == x2:
            sens = (y2-y1)//abs(y2-y1)
            for y in range(y1+sens, y2, sens):
                if self.grille[x1][y] > 0:
                    return MVT_OBSTRUCTION
        else:
            return MVT_N_AUTORISE
        return MVT_OK

    def mvtPossibleFou(self, x1, y1, x2, y2):
        if abs(x2-x1) == abs(y2-y1):
            sensX = (x2-x1)//abs(x2-x1)
            sensY = (y2-y1)//abs(y2-y1)
            x = x1
            y = y1
            dist = 0
            distTot = abs(x2-x1)
            while dist < distTot:
                dist += 1
                x += sensX
                y += sensY
                if self.grille[x][y] > 0:
                    if dist == distTot:
                        return MVT_OK # Saut
                    else:
                        return MVT_OBSTRUCTION
            return MVT_OK # Vide
        else:
            return MVT_N_AUTORISE

    def mvtPossibleCavalier(self, x1, y1, x2, y2):
            return MVT_PION_INC

    def mvtPossible(self, x1, y1, x2, y2):
        pion = self.grille[x1][y1]
        if self.aSonTour(pion):
            if (x1 != x2 or y1 != y2):
                if not self.aSonTour(self.grille[x2][y2]):
                    tPion = pion % 10
                    if tPion == 1: # Pion
                        return self.mvtPossiblePion(x1, y1, x2, y2)
                    elif tPion == 2: # Tour
                        return self.mvtPossibleTour(x1, y1, x2, y2)
                    elif tPion == 3: # Cavalier
                        return self.mvtPossibleCavalier(x1, y1, x2, y2)
                    elif tPion == 4: # Fou
                        return self.mvtPossibleFou(x1, y1, x2, y2)
                    elif tPion == 5: # Dame
                        tour = self.mvtPossibleTour(x1, y1, x2, y2)
                        fou = self.mvtPossibleFou(x1, y1, x2, y2)
                        if tour == MVT_OK or fou == MVT_OK:
                            return MVT_OK
                        elif tour == MVT_OBSTRUCTION or fou == MVT_OBSTRUCTION:
                            return MVT_OBSTRUCTION
                        else:
                            return MVT_N_AUTORISE 
                    elif tPion == 6: # Roi
                        if abs(x2-x1) <= 1 and abs(y2-y1) <= 1:
                                return MVT_OK
                        else:
                            return MVT_N_AUTORISE
                    else:
                        return MVT_PION_INC
                else:
                    return MVT_SAUT_AMI
            else:
                return MVT_SUR_PLACE
        else:
            return MVT_SELECTION
        return MVT_INCONNU

    def mvtsPossibles(self, x1, y1):
        tableau = []
        for x2 in range(0, CASES_COTE):
            for y2 in range(0, CASES_COTE):
                if self.mvtPossible(x1, y1, x2, y2) == MVT_OK:
                    tableau.append([x2, y2])
        return tableau

    def dPion(self, x1, y1, x2, y2):
        test = self.mvtPossible(x1, y1, x2, y2)
        if test == MVT_OK:
            self.grille[x1][y1], self.grille[x2][y2] = 0, self.grille[x1][y1]
            self.joueur = not self.joueur
        return test

# GUI

from tkinter import *

DECX = 0
DECY = 0
COTE_CASE = 50
MARGE_PIONS = 5
TEMPS_ANIM = 200
INTER_ANIM = 10

class PlateauTk:

    def __init__(self):

        self.fen = None
        self.can = None
        self.chaine = None
        self.grilleDamier = []
        self.imagesOriginales = []
        self.imagesRedim = []
        self.photos = []
        self.grillePions = []
        self.animations = []

        self.dEtape = True
        self.dx1 = -1
        self.dy1 = -1
        self.dx2 = -1
        self.dy2 = -1
        self.mvtsPossibles = []
        self.logique = LogiqueEchecs()

        self.creerFen()
        self.importerImages()
        self.redimImages()

        self.cDamier()
        self.cGrille()
        self.remplirGrille(self.logique.grille)

    def creerFen(self):
        self.fen = Tk()
        self.fen.title("Jeu d'Échecs")
        self.can = Canvas(self.fen, width=COTE_CASE * CASES_COTE,
                          height=COTE_CASE * CASES_COTE, bg="ivory")
        self.can.grid(row=0, column=1, columnspan=3)
        self.can.bind('<Button-1>', self.clic)
        self.chaine = Label(self.fen, text="Aux blancs")
        self.chaine.grid(row=2, column=2, padx=3, pady=3)
        # Button(self.fen, text="Nv. Partie", command=f_nvPartie).grid(row=2, \
        #   column=1, padx=3, pady=3)
        Button(self.fen, text="Quitter", command=self.fen.destroy).grid(row=2,
                                                                        column=3, padx=3, pady=3)

    def statut(self, texte, delai=0):
        self.chaine.config(text=texte)
        # TODO Timeout effacer si parametre / Liste

    def importerImages(self):
        for piece in range(0, 21):
            nom = 'sprites/'
            if piece % 10 == 1:
                nom += 'pion'
            elif piece % 10 == 2:
                nom += 'tour'
            elif piece % 10 == 3:
                nom += 'cavalier'
            elif piece % 10 == 4:
                nom += 'fou'
            elif piece % 10 == 5:
                nom += 'dame'
            elif piece % 10 == 6:
                nom += 'roi'
            else:
                self.imagesOriginales.append('')
                continue
            if piece < 10:
                nom += 'B'
            else:
                nom += 'N'
            nom += '.gif'
            self.imagesOriginales.append(PhotoImage(file=nom))

    def redimImages(self):
        sample = int(504 / (COTE_CASE - MARGE_PIONS))
        for piece in range(0, 21):
            if self.imagesOriginales[piece] != '':
                self.imagesRedim.append(self.imagesOriginales[piece].
                                        subsample(sample))
            else:
                self.imagesRedim.append('')

    # Dessin
    @staticmethod
    def caseCouleur(blanc, contexte):
        if contexte == 1: # Sélectionné
            return '#a0cefe' if blanc else '#478bd1'
        elif contexte == 2: # Possible
            return '#bafea0' if blanc else '#6ed147'
        elif contexte == 3: # Impossible
            return '#fea0ab' if blanc else '#d14758'
        else: # Normal
            return '#ffce9e' if blanc else '#d18b47'

    def cCase(self, x, y):
        couleur = self.caseCouleur(not LogiqueEchecs.eNoir(x, y), 0)
        return self.can.create_rectangle(x * COTE_CASE, y * COTE_CASE, (x + 1) * COTE_CASE, (y + 1) * COTE_CASE)

    def coulCase(self, x, y, contexte):
        couleur = self.caseCouleur(not self.logique.eNoir(x, y), contexte)
        self.can.itemconfig(self.grilleDamier[x][y], fill=couleur, outline=couleur)

    def coulDamier(self):
        for x in range(0, CASES_COTE):
            for y in range(0, CASES_COTE):
                self.coulCase(x, y, 0)

    def cDamier(self):
        self.grilleDamier = []
        for x in range(0, CASES_COTE):
            colonne = []
            for y in range(0, CASES_COTE):
                colonne.append(self.cCase(x + DECX, y + DECY))
            self.grilleDamier.append(colonne)
        self.coulDamier()

    def cPion(self, x, y, piece):
        if piece > 0:
            self.grillePions[x][y] = self.can.create_image((x + .5) * COTE_CASE,
                                                           (y + .5) * COTE_CASE, image=self.imagesRedim[piece])
        else:
            self.grillePions[x][y] = False

    def cGrille(self):
        self.grillePions = []
        for x in range(0, CASES_COTE):  # Crée self.grillePions
            colonne = []
            for y in range(0, CASES_COTE):
                colonne.append(False)
            self.grillePions.append(colonne)

    def remplirGrille(self, j_grilleF):
        for x in range(0, CASES_COTE):  # Remplis self.grillePions
            for y in range(0, CASES_COTE):
                self.cPion(x, y, j_grilleF[x][y])

    # Interaction
    def statutPrendre(self):
        if self.logique.joueur:
            joueur = 'blancs'
        else:
            joueur = 'noirs'
        self.statut('Prendre (' + joueur + ')')

    @staticmethod
    def animationDCoords(i):
        x = i['x1'] + (i['x2']-i['x1']) * (i['avancement']/i['total'])
        y = i['y1'] + (i['y2']-i['y1']) * (i['avancement']/i['total'])
        return [x, y]

    def animation(self):
        animationsNv = []
        for i in self.animations:
            if i['avancement'] < i['total']:
                if i['type'] == 'd':
                    coords = self.animationDCoords(i)
                    self.can.coords(i['pion'], coords[0], coords[1])
                # elif i['type'] == 'f':
                    # TODO Opacité de i['pion']
                # elif i['type'] == 'c':
                    # TODO Opacité de case
                i['avancement'] += INTER_ANIM
                animationsNv.append(i)
            else:
                if i['type'] == 'd':
                    self.can.coords(i['pion'], i['x2'], i['y2'])
                elif i['type'] == 'f':
                    self.can.delete(i['pion'])
                elif i['type'] == 'c':
                    self.coulCase(i['x'], i['y'], 0)
        self.animations = animationsNv
        if len(animationsNv):
            self.fen.after(INTER_ANIM, self.animation)

    def animer(self, animation):
        etaitVide = len(self.animations) < 1
        self.animations.append(animation)
        if etaitVide:
            self.animation()

    def animerD(self, x1, y1, x2, y2, pion):
        if len(self.animations):
            for i in self.animations:
                if i['pion'] == pion: # Si une animation pour ce pion existe
                                      # déjà, on la reprend et on la modifie
                    coords = self.animationDCoords(i)
                    i['x1'] = coords[0]
                    i['y1'] = coords[1]
                    i['x2'] = x2
                    i['y2'] = y2
                    # i['total'] = i['total'] - i['avancement']
                    i['total'] = TEMPS_ANIM
                    i['avancement'] = 0
                    return

        animation = {
            'x1': x1,
            'y1': y1,
            'x2': x2,
            'y2': y2,
            'pion': pion,
            'type': 'd',
            'total': TEMPS_ANIM,
            'avancement': 0
        }
        self.can.tag_raise(pion) # Mise au premier plan
        self.animer(animation)

    def animerF(self, pion): # Pion fade-out
        animation = {
            'pion': pion,
            'type': 'f',
            'total': TEMPS_ANIM,
            'avancement': 0
        }
        self.animer(animation)

    def animerC(self, x ,y):
        animation = {
            'type': 'c',
            'x': x,
            'y': y,
            'total': TEMPS_ANIM,
            'avancement': 0
        }
        self.animer(animation)


    def dPion(self, x1, y1, x2, y2):
        test = self.logique.dPion(x1, y1, x2, y2)
        if test == MVT_OK: # Si déplacement possible
            if self.grillePions[x2][y2]: # Si saut → Animation effacement
                self.animerF(self.grillePions[x2][y2])
            self.grillePions[x2][y2], self.grillePions[x1][y1] = \
                    self.grillePions[x1][y1], False
            self.animerD((x1 + .5) * COTE_CASE, (y1 + .5) * COTE_CASE, \
                    (x2 + .5) * COTE_CASE, (y2 + .5) * COTE_CASE, \
            self.grillePions[x2][y2])
            return True
        else:
            self.statut('Déplacment impossible ! (' + str(test) + ')')
            return False

    def dClic(self, x, y):
        # if not len(self.animations):
        if self.dEtape: # Prendre
            self.dx1, self.dy1 = x, y
            self.coulDamier() # Effacement des surbrillances
            if self.logique.aSonTour(self.logique.grille[self.dx1][self.dy1]): # Si possible jouer
                self.coulCase(self.dx1, self.dy1, 1)   
                self.mvtPossibles = self.logique.mvtsPossibles(self.dx1, self.dy1) # Surbrillance bleue
                for i in self.mvtPossibles: # Surbrillances vertes
                    self.coulCase(i[0], i[1], 2)
                self.statut('Poser')
                self.dEtape = not self.dEtape
            else: # Si pas pssible jouer
                self.coulCase(self.dx1, self.dy1, 3)
                self.animerC(self.dx1, self.dy1)

        else: # Poser
            self.dx2, self.dy2 = x, y
            if self.dPion(self.dx1, self.dy1, self.dx2, self.dy2) or (self.dx1 == self.dx2 and self.dy1 == self.dy2): # Si déplacement fait / Annule dépalcement
                self.coulDamier() # Effacer Surbrillance
                self.dEtape = not self.dEtape
                self.statutPrendre()
            else: # Si mauvais déplacement
                self.coulCase(self.dx2, self.dy2, 3)
                self.animerC(self.dx2, self.dy2)

    def clic(self, event):
        x = event.x // COTE_CASE
        y = event.y // COTE_CASE
        self.dClic(x, y)

p = PlateauTk()

# TODO Un jeu (canvas) et un frontend (fenetre)