import random
from tkinter import *

#HEIGHT IS ROWCOUNT, WIDTH IS COLCOUNT
class Connect4:
    def __init__(self, rowCount, colCount, circleSize, window):
        self.margin = 25
        self.rowCount = rowCount
        self.colCount = colCount
        self.circleSize = circleSize
        self.circleSpacing = 2
        self.width = rowCount * circleSize + self.rowCount * (self.circleSpacing * 2)
        self.height = colCount * circleSize + self.colCount * (self.circleSpacing * 2)
        self.window = window
        self.data = []
        self.frame = Frame(window)
        self.frame.pack()
        self.messageSize = 15
        self.diameter = self.rowCount * self.colCount
        self.initialColor = 'white'
        self.resetButton = Button(self.frame, text='Restart', command=self.restartGame)
        self.resetButton.pack(side=TOP)
        self.quitButton = Button(self.frame, text='Quit', command=self.quitGame)
        self.quitButton.pack(side=TOP)
        self.draw = Canvas(self.frame, height=self.height, width=self.width)
        self.draw.bind('<Button-1>', self.mouseInput)
        self.draw.pack(padx = self.margin, pady = self.margin)
        self.circles = []
        self.colors = []
        self.ox = 'X'
        y = 0
        for row in range(self.rowCount):
            circleRow = []
            colorRow = []
            x = 0
            for col in range(self.colCount):
                circleRow += [self.draw.create_oval(x + self.circleSpacing, y + self.circleSpacing, x + self.diameter - self.circleSpacing, y + self.diameter - self.circleSpacing, fill=self.initialColor)]
                colorRow += [self.initialColor]
                x += self.diameter + self.circleSpacing*2
            self.circles += [circleRow]
            self.colors += [colorRow]
            y += self.diameter + self.circleSpacing*2
        self.message = self.draw.create_text(self.messageSize, self.height-self.messageSize, text=f'{self.ox}\'s turn!', anchor='w', font='Courier 27')
        for row in range(self.rowCount):
            boardRow = []
            for col in range(self.colCount):
                boardRow += [' ']
            self.data += [boardRow]

    def __repr__(self): # Sets the literal structure of the board so that it's easy to interpret for the players
        s = ''
        for row in range(self.height):
            s += '|'
            for col in range(self.width):
                s += self.data[row][col] + '|'
            s += '\n'
        s += '--'*self.width + '-\n'
        for col in range(self.width):
            s += ' ' + str(col%10)
        s += '\n'
        return s

    def mouseInput(self, event):
        col = int(event.x/self.diameter)
        self.addMove(col)

    def quitGame(self):
        self.window.destroy()

    def restartGame(self):
        self.clear()
        for row in range(self.rowCount):
            for col in range(self.colCount):
                self.draw.itemconfig(self.circles[row][col], fill='white')

    def clear(self): # Clears the current state of the board
        for row in range(self.rowCount):
            for col in range(self.colCount): # For every value in the board
                self.data[row][col] = ' ' # Override whatever is there with a space (the original value each spot starts with)

    def addMove(self, col): # Adds a "checker" to the column passed
        if self.ox == 'X':
            color = 'red'
        else:
            color = 'black'
        foundMove = False
        if self.allowsMove(col): # Uses allowsMove to check if the column is available
            for row in range(self.rowCount):
                if self.data[row][col] != ' ': # If the spot is not empty...
                    self.data[row-1][col] = self.ox # Add the checker to the spot above it
                    self.draw.itemconfig(self.circles[row-1][col], fill=color)
                    foundMove = True
                    break
            if foundMove == False:
                self.data[self.rowCount-1][col] = self.ox # Otherwise put the checker there
                self.draw.itemconfig(self.circles[self.rowCount-1][col], fill=color)
            if self.winsFor(self.ox):
                # The move they just did let them win
                self.draw.itemconfigure(self.message, text=f'Congratulations {self.ox}, you won!')
                return
            if self.ox == 'X':
                self.ox = 'O'
            else:
                self.ox = 'X'
            self.draw.itemconfigure(self.message, text=f'{self.ox}\'s turn!')

    def allowsMove(self, col): # Tests to see if a column has room for another move
        if 0 <= col < self.colCount:
            return self.data[0][col] == ' '
        else:
            return False

    def delMove(self, col): # Deletes the last move played in column passed to the function
        for row in range(self.rowCount): # For each row..
            if self.data[row][col] != ' ': # If the indexed spot is not empty
                self.data[row][col] = ' ' # Override whatever is there with a space
                return
        return

    def isFull(self): # Checks if the board is full or not
        for values in self.data: # For each value in the entire board, if there's a space anywhere then it's not full (False). If there isn't a space, then the board is full (True).
            if ' ' in values:
                return False
        return True

    def winsFor(self, ox): # Checks to see if a checker ('X' or 'O') won the Connect 4.
        for row in range(self.rowCount): # Horizontal check
            for col in range(self.colCount - 3): # Uses an anchor point (subtracting 3 from the width and so forth) from where to start checking so it doesn't go out of range.
                if self.data[row][col] == ox and self.data[row][col+1] == ox and self.data[row][col+2] == ox and self.data[row][col+3] == ox:
                    return True
        for row in range(self.rowCount - 3): # Vertical check
            for col in range(self.colCount):
                if self.data[row][col] == ox and self.data[row+1][col] == ox and self.data[row+2][col] == ox and self.data[row+3][col] == ox:
                    return True
        for row in range(self.rowCount - 3): # SW>NE check
            for col in range(self.colCount - 3):
                if self.data[row][col] == ox and self.data[row+1][col+1] == ox and self.data[row+2][col+2] == ox and self.data[row+3][col+3] == ox:
                    return True
        for row in range(3, self.rowCount): # SE>NW check
            for col in range(self.colCount - 3):
                if self.data[row][col] == ox and self.data[row-1][col+1] == ox and self.data[row-2][col+2] == ox and self.data[row-3][col+3] == ox:
                    return True
        return False

    def hostGame(self): # Makes the game more playable by asking the user their turn and checking for wins or ties automatically
        move = 0 # This is used later so it will rotate back and forth between asking X to move and asking O to move
        while self.isFull() == False and self.winsFor('OX') != True: # While the board is not full and nobody has won yet, continue the loop
            if move == 0: # When move is 0, it's X's turn (X always goes first)
                X = int(input('Player "X", what column would you like to move? ')) # Asks for the user's input for which column to move, then turns it into an integer and stores it in X
                if self.allowsMove(X): # If that position is allowed...
                    self.addMove(X, 'X') # Add that move for 'X'
                    move += 1 # Increment move by 1 so that move won't be 0, and thus it will be O's turn
                    if self.winsFor('X'): # Check to see if X won the game with that move
                        print('Congratulations Player "X", you win!')
                        return
                else:
                    while self.allowsMove(X) == False: # While the user keeps putting invalid columns...
                        X = int(input('Oops! Your response was invalid, try again: ')) # Keep asking until the user chooses a column that is allowed
                    self.addMove(X, 'X')
                    move += 1
                    if self.winsFor('X'):
                        print('Congratulations Player "X", you win!')
                        return
            else: # O's turn to play, same mechanics just for a different player
                O = int(input('Player "O", what column would you like to move? '))
                if self.allowsMove(O):
                    self.addMove(O, 'O')
                    move -= 1 # Decrements move so it will be 0 and thus will be X's turn again
                    if self.winsFor('O'):
                        print('Congratulations Player "O", you win!')
                        return
                else:
                    while self.allowsMove(O) == False:
                        O = int(input('Oops! Your response was invalid, try again: '))
                    move -= 1
                    self.addMove(O, 'O')
                    if self.winsFor('O'):
                        print('Congratulations Player "O", you win!')
                        return
        print('It\'s a tie!') # If it breaks out of the loop and someone hasn't already won, then that mean the board must be full and thus would be a tie
        return

    def playGameWith(self, aiPlayer):
        move = 0 # This is used later so it will rotate back and forth between asking X to move and asking O to move
        while self.isFull() == False and self.winsFor('OX') != True: # While the board is not full and nobody has won yet, continue the loop
            if move == 0: # When move is 0, it's X's turn (X always goes first)
                X = int(input('Player "X", what column would you like to move? ')) # Asks for the user's input for which column to move, then turns it into an integer and stores it in X
                if self.allowsMove(X): # If that position is allowed...
                    self.addMove(X, 'X') # Add that move for 'X'
                    move += 1 # Increment move by 1 so that move won't be 0, and thus it will be O's turn
                    if self.winsFor('X'): # Check to see if X won the game with that move
                        print('Congratulations Player "X", you win!')
                        return
                else:
                    while self.allowsMove(X) == False: # While the user keeps putting invalid columns...
                        X = int(input('Oops! Your response was invalid, try again: ')) # Keep asking until the user chooses a column that is allowed
                    self.addMove(X, 'X')
                    move += 1
                    if self.winsFor('X'):
                        print('Congratulations Player "X", you win!')
                        return
            else: # O's turn to play, same mechanics just for a different player
                O = aiPlayer.nextMove(self)
                self.addMove(O, 'O')
                move -= 1 # Decrements move so it will be 0 and thus will be X's turn again
                if self.winsFor('O'):
                    print('Congratulations Player "O", you win!')
                    return
        print('It\'s a tie!') # If it breaks out of the loop and someone hasn't already won, then that mean the board must be full and thus would be a tie
        return

class Player:
    def __init__(self, ox, tbt, ply):
        self.ox = ox
        self.tbt = tbt
        self.ply = ply

    def __repr__(self):
        intro = 'Tiebreak Type' + self.tbt
        intro += '\n' + 'Ply:' + str(self.ply)
        return intro

    def opponent(self):
        if self.ox == 'X':
            return 'O'
        else:
            return 'X'

    def scoreBoard(self, b):
        if b.winsFor(self.opponent()) == True:
            return 0
        elif b.winsFor(self.ox) == True:
            return 100
        else:
            return 50

    def tieBreakType(self, scores):
        eachCol = []
        t = 0
        for col in range(len(scores)):
            if scores[col] == max(scores):
                t += 1
                eachCol += [col]
        if t > 1:
            if self.tbt == 'Random':
                return random.choice(eachCol)
            elif self.tbt == 'Right':
                return max(eachCol)
            elif self.tbt == 'Left':
                return min(eachCol)
        else:
            return eachCol[0]

    def scoresFor(self, b, ox, ply):
        score = [50]*b.width # Pre-seeds a list with the default value of 50, uses list multiplication to get the width of the board to determine how many columns are needed
        for col in range(b.width): # For each column...
            if b.allowsMove(col) == False: # Base Case, if the column is full it should always have the value of -1
                score[col] = -1
            elif b.winsFor(self.opponent()) or b.winsFor(self.ox): # Base Case, the column is either valued as a loss (0) or a win(100)
                score[col] = self.scoreBoard(b)
            elif self.ply == 0: # Base Case, ply 0 will always value every column (except full columns) at 50
                score[col] = 50
            elif self.ply > 0: # Evaluates higher plys through recursion
                b.addMove(col, self.ox) # Add a move to every column and evaluate
                if self.scoreBoard == 0 or self.scoreBoard == 100: # Evaluate if the scoreBoard is a loss or a win
                    score[col] = self.scoreBoard(b)
                else:
                    p = Player(self.opponent(), self.tbt, self.ply-1) # Sets up the parameters of the game, subtracts 1 from ply to avoid loop
                    score[col] = 100 - max(p.scoresFor(b, self.ox, self.ply)) # This is the recursive step that uses scoresFor to evaluate the board based on the opponent, tiebreak type, and ply number.
                b.delMove(col) # Delete the move from every column after done evaluating
        return score # Return the best decision(s)

    def nextMove(self, b):
        score = self.scoresFor(b, self.ox, self.ply)
        return self.tieBreakType(score)

root = Tk()
root.title('Connect 4')
myScreen = Connect4(7, 6, 100, root) # 130 is the maximum size for circle spacing
root.mainloop()

def main():
    pass

if __name__ == '__main__':
    main()