tictactoe-in-go/game/gameloop.go

package game

import (
	"tictactoe/gameControl"
	"tictactoe/opponent"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/layout"
	"fyne.io/fyne/v2/widget"
)

var board = [3][3]string{
	{" ", " ", " "},
	{" ", " ", " "},
	{" ", " ", " "},
}

const (
	PLAYER_X = "X"
	PLAYER_O = "O"
)

var gridContainer *fyne.Container

// creates the button grid for the tictactoe game
func MakeButtonGrid(rows, cols int, Window fyne.Window) *fyne.Container {
	// generates layout and grid container
	gridLayout := layout.NewGridLayout(cols)
	gridContainer = container.New(gridLayout)
	// create the 3x3 Button grid
	for row := 0; row < rows; row++ {
		for col := 0; col < cols; col++ {
			button := CreateButton(row, col, Window)
			gridContainer.Add(button)
		}
	}

	return gridContainer
}

// create the button grid and adds key press handler for each grid-button
func CreateButton(row, col int, Window fyne.Window) *widget.Button {
	button := widget.NewButton(" ", nil)

	button.OnTapped = func() {
		if button.Text == " " {
			button.SetText(PLAYER_X)
			Gameloop(row, col, Window)
		}
	}
	return button
}

// reset the game by clearing the buttons and the board array
func ResetButtonTexts(container *fyne.Container) {
	for _, child := range container.Objects {
		if btn, ok := child.(*widget.Button); ok {
			btn.SetText(" ")
		}
	}
	board = [3][3]string{
		{" ", " ", " "},
		{" ", " ", " "},
		{" ", " ", " "},
	}
	EnableAllButtons(gridContainer)
}

// apply AI opponent text to the button
func ChangeButtonText(row, col int) {
	gridContainer.Objects[col+row*3].(*widget.Button).SetText("O")
}

// gameloop function for the game process:
// human makes a move, AI counters
func Gameloop(row, col int, Window fyne.Window) {
	const gameOverText string = "Game Over"
	// starting with the human making a move
	board[row][col] = PLAYER_X
	// checking if the game has been won by the human player
	if gameControl.PlayerHasWon(board, PLAYER_X) {
		dialog.ShowInformation(gameOverText, "X has won!", Window)
		DisableAllButtons(gridContainer)
		return
	}
	// checking if the game is a draw
	if gameControl.BoardisFull(board) {
		dialog.ShowInformation(gameOverText, "It's a draw!", Window)
		DisableAllButtons(gridContainer)
		return
	}
	// AI opponent makes a move
	bestMove := opponent.Minimax(board, 0, true, PLAYER_O)
	// add the move to the board
	board[bestMove.Row][bestMove.Col] = PLAYER_O
	ChangeButtonText(bestMove.Row, bestMove.Col)

	// check if AI opponent has won the game
	if gameControl.PlayerHasWon(board, PLAYER_O) {
		dialog.ShowInformation(gameOverText, "O has won!", Window)
		DisableAllButtons(gridContainer)
		return
	}
	// checking if the game is a draw
	if gameControl.BoardisFull(board) {
		dialog.ShowInformation(gameOverText, "It's a draw!", Window)
		DisableAllButtons(gridContainer)
		return
	}
}

// function to disable all buttons inside the grid
func DisableAllButtons(container *fyne.Container) {
	for _, child := range container.Objects {
		if btn, ok := child.(*widget.Button); ok {
			btn.Disable()
		}
	}
}

// function to enable all buttons inside the grid
func EnableAllButtons(container *fyne.Container) {
	for _, child := range container.Objects {
		if btn, ok := child.(*widget.Button); ok {
			btn.Enable()
		}
	}
}