using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;


public class GameManager : MonoBehaviour
{
    public int score;
    public int lives;
    public int highscore;
    private bool gameInPlay = false;
    private int level;

    ///////////////////////////////////////////////////////////////////////////
    ///
    /// TODO: Declare a list of gameobjects for the bricks, as per the design
    /// - Make sure it is accessible from other classes
    ///
    ///////////////////////////////////////////////////////////////////////////


	public List<Transform> bricks;

    private Transform ball;
    private Transform bat;

    public Transform brickPrefab;
    public Transform batPrefab;
    public Transform ballPrefab;
    public Text TextBoxScore;
    public Text TextBoxHighscore;
    public Text TextBoxTitle;
    public Text TextBoxNewHigh;
    public Text TextBoxPrompt;
    public Text TextBoxLives;

    void Start()
    {
        TextBoxNewHigh.enabled = false;
    }

    // Update is called once per frame
    void Update () {



        if (gameInPlay)
        {

            // check for the last brick being destroyed, and start a new level
            if (bricks.Count == 0)
            {
                level++;
                StartNewLevel(level);
            }

            // game over when you're out of lives
            if (lives <= 0)
            {
                EndGame();
            }
        }
        else
        {
            // press Q to quit (will only work in standalone executable)
            if (Input.GetKeyDown(KeyCode.Q))
            {
                Application.Quit();
            }

			if(Input.GetKeyDown(KeyCode.P)){
				gameInPlay = true;
				StartNewGame();
			}
            ///////////////////////////////////////////////////////////////////////////
            ///
            /// TODO: Check if the player has pressed the 'P' key when at game over
            /// - Respond by calling the function to start a new game,
            /// - and changing the appropriate variable so that the game is in play
            ///
            ///////////////////////////////////////////////////////////////////////////

        }

        // keep on-screen values up to date
        TextBoxScore.text = "SCORE: " + score;
        TextBoxLives.text = "LIVES: " + lives;
        TextBoxHighscore.text = "HIGH: " + highscore;
    }

    private void StartNewGame()
    {
        score = 0;
        lives = 3;
        TextBoxLives.enabled = true;
        TextBoxTitle.enabled = false;
        TextBoxPrompt.enabled = false;
        TextBoxNewHigh.enabled = false;
        bat = Instantiate(batPrefab, new Vector3(0, -4, 0), Quaternion.identity);
        ball = Instantiate(ballPrefab, new Vector3(0, -2, 0), Quaternion.identity);
        level = 0;
    	StartNewLevel(level);
        ///////////////////////////////////////////////////////////////////////////
        ///
        /// TODO: Call the function to start a new level
        /// - Include appropriate arguments for parameters
        ///
        ///////////////////////////////////////////////////////////////////////////




    }

    private void StartNewLevel(int level){
    	ball.position = new Vector3(0,-2,0);

    	level = level + 1;
    	if(level > 1){
    		score = score + 10;
    	}

    	int gridHeight = 10;
    	int gridWidth = 4;
    	for(int x = 0; x < gridHeight; x++){
    		for(float y = 0; y < gridWidth; y++){
    			bricks.Add(Instantiate(brickPrefab, new Vector3(-4.5f + x * 1, 0 + y * 1, 0), Quaternion.identity));

    		}
    	}
    }

    ///////////////////////////////////////////////////////////////////////////
    ///
    /// TODO: Create the function to start a new level
    /// - Include appropriate parameters
    /// - Set the ball's co ordinates to 0, -2, 0
    /// - Give the player a bonus 10 points if it's level 2 or more
    /// - Use one or more FOR loops to iterate through 4 rows of 10 bricks
    /// - Each brick should be instantiated from the brick prefab
    /// - it's co-ordinates should be calculated so the bricks are in a grid
    /// - Add the new object created, into the list of bricks.
    ///
    ///////////////////////////////////////////////////////////////////////////

    private void EndGame()
    {
        // Find out if we have a new highscore
        if (score>highscore)
        {
            highscore = score;
            TextBoxNewHigh.enabled = true;
        }

        // Remove all bricks from the game and from the list
        for(int i=bricks.Count-1; i>=0; i--)
        {
            Destroy(bricks[i]);
            bricks.RemoveAt(i);
        }
        Destroy(ball.gameObject);
        Destroy(bat.gameObject);
        TextBoxLives.enabled = false;
        TextBoxTitle.enabled = true;
        TextBoxPrompt.enabled = true;
        gameInPlay = false;
    }
}