//
//  ViewController.swift
//  TTT_SP2018
//
//  Created by John Robinson on 2/22/18.
//  Copyright © 2018 John Robinson. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    //Game Variables
    
    var mBoard: [String] = ["0", "1", "2", "3", "4", "5", "6", "7", "8"]
    var mBoardArray: [UIImageView] = [];
    let BOARD_SIZE = 9
    
    let HUMAN_PLAYER = "X"
    let COMPUTER_PLAYER = "O"
    var turn = "X"
    var win = 0
    var move = -1

    //PUT THE BUTTON OUTLETS HERE
    
    
    
    
    //PUT THE LABEL OUTLET HERE
    
    
    
    
    //PUT THE NEW GAME BUTTON ACTION HERE, THEN MOVE THE CODE BELOW INSIDE THE {  } BRACKETS
    
    
        
        s1.image = nil
        s2.image = nil
        s3.image = nil
        s4.image = nil
        s5.image = nil
        s6.image = nil
        s7.image = nil
        s8.image = nil
        s9.image = nil
        
        mBoard = ["0", "1", "2", "3", "4", "5", "6", "7", "8"]
        
        infoLabel.text = "Player X's Turn"
        
        win = 0
        
        turn = HUMAN_PLAYER
        

    /********* DON"T TOUCH ANYTHING BELOW THIS POINT ***************/
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        mBoardArray.append(s1)
        mBoardArray.append(s2)
        mBoardArray.append(s3)
        mBoardArray.append(s4)
        mBoardArray.append(s5)
        mBoardArray.append(s6)
        mBoardArray.append(s7)
        mBoardArray.append(s8)
        mBoardArray.append(s9)
        
        infoLabel.text = "Player X's Turn"
        
        
        let tapGesture1 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img1Clicked))
        
        tapGesture1.numberOfTapsRequired = 1
        
        s1.addGestureRecognizer(tapGesture1)
        
        
        
        let tapGesture2 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img2Clicked))
        
        tapGesture2.numberOfTapsRequired = 1
        
        s2.addGestureRecognizer(tapGesture2)
        
        
        let tapGesture3 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img3Clicked))
        
        tapGesture3.numberOfTapsRequired = 1
        
        s3.addGestureRecognizer(tapGesture3)
        
        
        
        let tapGesture4 = UITapGestureRecognizer(target: self, action:#selector(ViewController.img4Clicked))
        
        tapGesture4.numberOfTapsRequired = 1
        
        s4.addGestureRecognizer(tapGesture4)
        
        let tapGesture5 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img5Clicked))
        
        tapGesture5.numberOfTapsRequired = 1
        
        s5.addGestureRecognizer(tapGesture5)
        
        
        
        let tapGesture6 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img6Clicked))
        
        tapGesture6.numberOfTapsRequired = 1
        
        s6.addGestureRecognizer(tapGesture6)
        
        let tapGesture7 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img7Clicked))
        
        tapGesture7.numberOfTapsRequired = 1
        
        s7.addGestureRecognizer(tapGesture7)
        
        
        
        let tapGesture8 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img8Clicked))
        
        tapGesture8.numberOfTapsRequired = 1
        
        s8.addGestureRecognizer(tapGesture8)
        
        
        let tapGesture9 = UITapGestureRecognizer(target: self, action: #selector(ViewController.img9Clicked))
        
        tapGesture9.numberOfTapsRequired = 1
        
        s9.addGestureRecognizer(tapGesture9)
        
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
        
    
    
    // Check for a winner.  Return
    //  0 if no winner or tie yet
    //  1 if it's a tie
    //  2 if X won
    //  3 if O won
    func checkForWinner()
    {
        
        // Check horizontal wins
        for i in stride(from: 0, to: 8, by: 3)
        {
            //print(i)
            if (mBoard[i] == HUMAN_PLAYER && mBoard[i+1] == HUMAN_PLAYER && mBoard[i+2] == HUMAN_PLAYER)
            {
                win = 2
                return
            }
            
            if (mBoard[i] == COMPUTER_PLAYER && mBoard[i+1] == COMPUTER_PLAYER && mBoard[i+2] == COMPUTER_PLAYER)
            {
                win = 3
                return
            }
        }
        
        // Check vertical wins
        for i in 0 ... 2
        {
            if (mBoard[i] == HUMAN_PLAYER && mBoard[i+3] == HUMAN_PLAYER && mBoard[i+6] == HUMAN_PLAYER)
            {
                win = 2
                return
            }
            
            if (mBoard[i] == COMPUTER_PLAYER && mBoard[i+3] == COMPUTER_PLAYER && mBoard[i+6] == COMPUTER_PLAYER)
            {
                win =  3
                return
            }
        }
        
        // Check for diagonal wins
        if ((mBoard[0] == HUMAN_PLAYER && mBoard[4] == HUMAN_PLAYER && mBoard[8] == HUMAN_PLAYER) || (mBoard[2] == HUMAN_PLAYER && mBoard[4] == HUMAN_PLAYER && mBoard[6] == HUMAN_PLAYER))
        {
            win = 2
            return
        }
        
        if ((mBoard[0] == COMPUTER_PLAYER && mBoard[4] == COMPUTER_PLAYER && mBoard[8] == COMPUTER_PLAYER) || (mBoard[2] == COMPUTER_PLAYER && mBoard[4] == COMPUTER_PLAYER && mBoard[6] == COMPUTER_PLAYER))
        {
            win = 3
            return
        }
        
        // Check for tie
        for i in 0...BOARD_SIZE-1
        {
            // If we find a number, then no one has won yet
            if (mBoard[i] != HUMAN_PLAYER && mBoard[i] != COMPUTER_PLAYER)
            {
                win = 0
                return
            }
        }
        
        // If we make it through the previous loop, all places are taken, so it's a tie
        win = 1
    }
    
    
    func showWinStatus(){
        
        print("win = " + String(win))
        if(win == 3){
            print("Computer Wins!!")
            infoLabel.text = "Computer Wins !!!"
        }
        
        if(win == 2){
            print("Human Wins!!")
            infoLabel.text = "Human Wins !!!"
        }
        
        
        if(win == 1){
            print("It a Tie!!")
            infoLabel.text = "It's a Tie !!!"
        }
        
        
        
    }
    
    
    func displayBoard(){
        print()
        print(mBoard[0] + " | " + mBoard[1] + " | " + mBoard[2])
        print("-----------")
        print(mBoard[3] + " | " + mBoard[4] + " | " + mBoard[5])
        print("-----------")
        print(mBoard[6] + " | " + mBoard[7] + " | " + mBoard[8])
        print()
    }
    
    
    
    @objc func img1Clicked(){
        
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s1.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[0] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
                
            }
        }
    }
    
    @objc func img2Clicked(){
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s2.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[1] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
            }
        }
    }
    
    @objc func img3Clicked(){
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s3.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[2] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
                
                
            }
        }
    }
    
    @objc func img4Clicked(){
        
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s4.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[3] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
            }
        }
    }
    
    @objc func img5Clicked(){
        
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s5.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[4] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
                
                
            }
        }
    }
    
    @objc func img6Clicked(){
        
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s6.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[5] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
            }
        }
    }
    
    @objc func img7Clicked(){
        
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s7.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[6] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
                
            }
        }
    }
    
    @objc func img8Clicked(){
        
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s8.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[7] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
            }
        }
    }
    
    @objc func img9Clicked(){
        
        if(win == 0){
            
            if(turn == HUMAN_PLAYER){
                s9.image = #imageLiteral(resourceName: "x_img.png")
                turn = COMPUTER_PLAYER
                infoLabel.text = "Computer's Turn"
                mBoard[8] = HUMAN_PLAYER
                displayBoard()
                checkForWinner()
                showWinStatus()
                if(win == 0){
            		getComputerMove()
            		turn = self.HUMAN_PLAYER
            		infoLabel.text = "Human's Turn"
            		displayBoard()
            		checkForWinner()
            		showWinStatus()
		}
            }
        }
    }
    
    func getComputerMove()
    {
        
        
        
        // First see if there's a move O can make to win
        for i in 0 ... BOARD_SIZE-1 {
            if (mBoard[i] != HUMAN_PLAYER && mBoard[i] != COMPUTER_PLAYER) {
                let curr = mBoard[i]
                mBoard[i] = COMPUTER_PLAYER
                
                checkForWinner()
                
                if (win == 3) {
                    print("Computer is making a winning moving to " + String((i)))
                    mBoardArray[i].image = #imageLiteral(resourceName: "o_img.png")
                    
                    return
                    
                    
                }
                else
                {
                    
                    mBoard[i] = curr;
                }
                
            }
        }
        
        
        // See if there's a move O can make to block X from winning
        for i in 0 ... BOARD_SIZE-1 {
            if (mBoard[i] != HUMAN_PLAYER && mBoard[i] != COMPUTER_PLAYER) {
                let curr = mBoard[i];   // Save the current number
                mBoard[i] = HUMAN_PLAYER
                
                
                checkForWinner()
                if (win == 2) {
                    print("Computer is making a blocking moving to " + String((i)))
                    mBoard[i] = self.COMPUTER_PLAYER;
                    mBoardArray[i].image = #imageLiteral(resourceName: "o_img.png")
                    
                    return
                }
                    
                    
                else{
                    
                    mBoard[i] = curr}
            }
        }
        
        
        var count = 0
        // Generate random move
        repeat
        {
            count += 1
            move  = Int(arc4random_uniform(9))
            print("random move is " + String(move))
        } while ((mBoard[move] == HUMAN_PLAYER || mBoard[move] == COMPUTER_PLAYER) && count < 9)
        
        if(mBoard[move] == HUMAN_PLAYER || mBoard[move] == COMPUTER_PLAYER){
            return
        }
        else{
            
            print("Computer is making a random moving to " + String((move)))
            
            mBoard[move] = COMPUTER_PLAYER
            mBoardArray[move].image = #imageLiteral(resourceName: "o_img.png")
            
            
            return
        }
    }
}