From 83fe41b820d115071a0a171dea218f158ae889f4 Mon Sep 17 00:00:00 2001
From: Falko Habel <falko.habel@gmx.de>
Date: Tue, 23 Apr 2024 21:12:46 +0200
Subject: [PATCH] Gameloop functions implemented to play the game

---
 game/gameloop.go | 121 +++++++++++++++++++++++++++++++++++++++++++++++
 game/window.go   |  11 +++--
 2 files changed, 127 insertions(+), 5 deletions(-)

diff --git a/game/gameloop.go b/game/gameloop.go
index f876790..cc9c31e 100644
--- a/game/gameloop.go
+++ b/game/gameloop.go
@@ -1 +1,122 @@
 package game
+
+import (
+	"tictactoe/gamecontrol"
+	"tictactoe/opponent"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"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) *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)
+			gridContainer.Add(button)
+		}
+	}
+
+	return gridContainer
+}
+
+// create the button grid and adds key press handler for each grid-button
+func CreateButton(row, col int) *widget.Button {
+	button := widget.NewButton(" ", nil)
+
+	button.OnTapped = func() {
+		if button.Text == " " {
+			button.SetText(PLAYER_X)
+			Gameloop(row, col)
+		}
+	}
+	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)
+	TextLabel.SetText("TicTacToe")
+}
+
+// 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) {
+	// 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) {
+		TextLabel.SetText("X Wins")
+	}
+	// checking if the game is a draw
+	if gamecontrol.BoardisFull(board) {
+		TextLabel.SetText("Draw")
+	}
+	// 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) {
+		TextLabel.SetText("O Wins")
+		DisableAllButtons(gridContainer)
+	}
+	// checking if the game is a draw
+	if gamecontrol.BoardisFull(board) {
+		TextLabel.SetText("Draw")
+	}
+}
+
+// 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()
+		}
+	}
+}
diff --git a/game/window.go b/game/window.go
index c68a8e5..791a4f5 100644
--- a/game/window.go
+++ b/game/window.go
@@ -20,17 +20,18 @@ func CreateWindow() fyne.Window {
 
 	// Set the text of our TextLabel to TicTacToe
 	TextLabel = widget.NewLabel("TicTacToe")
-
-	// Create a new button with the text "Restart" and a handler function, if it gets pressed.
+	// create the 3x3 Button grid
+	matchField := MakeButtonGrid(3, 3)
+	// Create a new button and a handler function, if it gets pressed.
 	restartButton := widget.NewButton("Restart", func() {
-		// Add logic here to restart the game.
+		ResetButtonTexts(matchField)
 	})
 
 	// vertical box layout containg the top Items, here the textlabel and the button.
 	topItems := container.NewVBox(TextLabel, restartButton)
 
-	// Generate content for the window using a border layout with the topItems as the only child.
-	content := container.New(layout.NewBorderLayout(topItems, nil, nil, nil), topItems)
+	// Generate content for the window using a border layout with the topItems and matchField as the children
+	content := container.New(layout.NewBorderLayout(topItems, nil, nil, nil), topItems, matchField)
 
 	// Set the content and size of the window.
 	myWindow.SetContent(content)