using UnityEngine;
using UnityEngine.UI;
using AngelsDemons;

public class BoardManager : MonoBehaviour
{

	// Global reference to the canvas' width and height.
	private float canvaswidth;
	private float canvasheight;

	// Variable to change spacing of the board from the edges of the canvas.
	private float canvasspacing = 80f;
	public Image board;

	// Board size references.
	private float boardwidth;
	private float boardheight;

	// Might want to make this part modular in the future.
	private int numberofspaces = 11;

	// Spaces for the board need to be spawned and resized based on canvas.
	private float spacespacing;
	public Button blackspaceasset;
	public Transform blackspacetransform;
	public Image whitespaceasset;
	public Transform whitespacetransform;

	// Image assets for the board spaces.
	public Sprite angelsprite;
	public Sprite demonsprite;
	public Sprite emptysprite;

	// Keep references of all the space GameObjects.
	private Button[] blackspaces = new Button[61];
	private WhiteSpace[] whitespaces = new WhiteSpace[60];

	// GameOver assets. Just to have a way to end the game.
	public GameObject gameoverobjects;

	// Use this for initialization
	void Start ()
	{
		canvasheight = this.GetComponentInParent<RectTransform>().rect.height;
		canvaswidth = this.GetComponentInParent<RectTransform>().rect.width;
		boardheight = board.GetComponent<RectTransform>().rect.height;
		boardwidth = board.GetComponent<RectTransform>().rect.width;
		spacespacing = ((canvaswidth - canvasspacing)/11f);
		
		SpawnInitialBoard();

		Board.ResetSpaces();
		Board.ResetSprites();

		// This should later be handled by Player.StartGame through MenuNav.
		Board.StartGame();
		GameLogic.ResetTurn();
	}

	// Grab the current canvas dimentions, used for dynamic resizing checks.
	private Vector2 GetCurrentCanvas()
	{
		Vector2 output;
		output.x = this.GetComponentInParent<RectTransform>().rect.height;
		output.y = this.GetComponentInParent<RectTransform>().rect.width;
		return output;
	}

	// Function call to return one Instantiated Button object.
	// Should be changed along with SpawnWhiteSpace to instead spawn the object and attach them
	// to a defined struct that can also hold the index of the spawned object. This will allow
	// for easier indexing of these prefabs in the future without the need for parsing.
	private Button SpawnBlackSpace(int i)
	{
		Button bsbutton;
		bsbutton = Instantiate(blackspaceasset, blackspacetransform);
		bsbutton.name += "" + i;
		bsbutton.onClick.AddListener(delegate{ButtonAction(bsbutton);});
		return bsbutton;
	}

	// Function call to return one Instantiated Image object.
	private Image SpawnWhiteSpace()
	{
		Image wsimage;
		wsimage = Instantiate(whitespaceasset, whitespacetransform);
		return wsimage;
	}

	// Set up an empty board, sized to the current canvas.
	private void SpawnInitialBoard()
	{
		for(int i = 0; i < blackspaces.Length; ++i)
		{
			Button temp;
			temp = SpawnBlackSpace(i);
			temp.GetComponent<RectTransform>().sizeDelta = new Vector2(spacespacing, spacespacing);
			
			float x = (spacespacing*i*2 + (temp.GetComponent<RectTransform>().rect.width / 2f)) % (boardwidth) - ((boardwidth) / 2f);
			float y = (boardheight / 2f) - ((temp.GetComponent<RectTransform>().rect.height / 2f) + spacespacing*(Mathf.Floor(i/(11f/2f))));
			temp.transform.localPosition = new Vector3(x, y, 0);
			
			blackspaces[i] = temp;

			if(i < blackspaces.Length - 1)
			{
				WhiteSpace tempws;

				Image tempimage;
				tempimage = SpawnWhiteSpace();
				tempimage.GetComponent<RectTransform>().sizeDelta = new Vector2(spacespacing, spacespacing);
				tempimage.sprite = emptysprite;
				
				x = (spacespacing*i*2 + (tempimage.GetComponent<RectTransform>().rect.width / 2f)*3) % (boardwidth) - ((boardwidth) / 2f);
				y = (boardheight / 2f) - ((tempimage.GetComponent<RectTransform>().rect.height / 2f) + spacespacing*(Mathf.Floor((i + 1)/(11.01f/2f))));
				tempimage.transform.localPosition = new Vector3(x, y, 0);

				tempws.img = tempimage;
				tempws.spriteindex = 2;

				whitespaces[i] = tempws;
			}
		}
	}

	// Update the board's scale according to the current canvas size, call UpdatePieceScale().
	private void UpdateBoardScale()
	{
		canvasheight = this.GetComponentInParent<RectTransform>().rect.height;
		canvaswidth = this.GetComponentInParent<RectTransform>().rect.width;
		
		if(canvaswidth > canvasheight)
		{
			board.rectTransform.sizeDelta = new Vector2(canvasheight - canvasspacing, canvasheight - canvasspacing);
		}
		else
		{
			board.rectTransform.sizeDelta = new Vector2(canvaswidth - canvasspacing, canvaswidth - canvasspacing);
		}

		boardheight = board.GetComponent<RectTransform>().rect.height;
		boardwidth = board.GetComponent<RectTransform>().rect.width;

		spacespacing = ((boardwidth)/11f);

		UpdatePieceScale();
	}

	// Update the pieces' scales according to the current canvas size.
	private void UpdatePieceScale()
	{
		for(int i = 0; i < blackspaces.Length; ++i)
		{
			Button temp = blackspaces[i];
			temp.GetComponent<RectTransform>().sizeDelta = new Vector2(spacespacing, spacespacing);
			float x = (spacespacing*i*2 + (temp.GetComponent<RectTransform>().rect.width / 2f)) % (boardwidth) - ((boardwidth) / 2f);
			float y = (boardheight / 2f) - ((temp.GetComponent<RectTransform>().rect.height / 2f) + spacespacing*(Mathf.Floor(i/(11f/2f))));
			temp.transform.localPosition = new Vector3(x, y, 0);
			blackspaces[i] = temp;

			if(i < blackspaces.Length - 1)
			{
				Image tempimage = whitespaces[i].img;
				tempimage.GetComponent<RectTransform>().sizeDelta = new Vector2(spacespacing, spacespacing);
				
				x = (spacespacing*i*2 + (tempimage.GetComponent<RectTransform>().rect.width / 2f)*3) % (boardwidth) - ((boardwidth) / 2f);
				y = (boardheight / 2f) - ((tempimage.GetComponent<RectTransform>().rect.height / 2f) + spacespacing*(Mathf.Floor((i + 1)/(11.01f/2f))));
				tempimage.transform.localPosition = new Vector3(x, y, 0);

				whitespaces[i].img = tempimage;
			}
		}
	}

	// Change the passed in space indexes' sprites to the specified sprites.
	private void ChangeSpaces()
	{
		for(int i = 0; i < Board.GetSpacesLength(); ++i)
		{
			if(Board.GetSpaces(i) >= 0 && Board.GetSpaces(i) < whitespaces.Length)
			{
				switch(Board.GetSprites(i))
				{
					case 0:
						whitespaces[Board.GetSpaces(i)].img.sprite = angelsprite;
						whitespaces[Board.GetSpaces(i)].spriteindex = 0;
						break;
					case 1:
						whitespaces[Board.GetSpaces(i)].img.sprite = demonsprite;
						whitespaces[Board.GetSpaces(i)].spriteindex = 1;
						break;
					case 2:
						whitespaces[Board.GetSpaces(i)].img.sprite = emptysprite;
						whitespaces[Board.GetSpaces(i)].spriteindex = 2;
						break;
					default:
						break;
				}
			}
		}
		
		// After a move has been made, since right now spaces are checked every frame,
		// change all spaces[] values to -1 to avoid sprites being updated every frame.
		Board.ResetSpaces();
		Board.ResetSprites();

		Board.SetMoveMade(false);
	}
	
	/* Update is called once per frame
	 * Here we check if the current canvas has changed and if so, call UpdateBoardScale(),
	 * then we also check if a move has been made, and call ChangeSpaces with the necessary parameters.
	 */
	void Update ()
	{
		Vector2 currentcanvas = GetCurrentCanvas();

		if(currentcanvas.x != canvaswidth || currentcanvas.y != canvasheight)
		{
			UpdateBoardScale();
		}

		if(Board.GetMoveMade() && !Board.IsGameOver())
		{
			ChangeSpaces();
			CheckGameOver();
		}
	}

	// Function definition to specify what the buttons should do when pressed, which is to call
	// the GameManager.MakeMove() function with the necessary parameters.
	public void ButtonAction(Button b)
	{
		if(!Board.IsGameOver())
		{
			int buttonindex = 0;
			int.TryParse(b.name.Replace("Move Selection(Clone)", ""), out buttonindex);
			
			Vector2 boardcoords = Board.ConvertButtonIndex(buttonindex);

			// This is completely incorrect and will most likely need a switch case of some kind in the future.
			//Debug.Log("Board coordinates: " + boardcoords.x + " " + boardcoords.y);

			// Temporarily hardcoded. Should later be changed to a GameManager function call that determines
			// what to change spaces to.
			GameLogic.MakeMove(boardcoords, numberofspaces, whitespaces);
		}
		else
		{
			Debug.Log("The game is over.");
		}
	}

	public void CheckGameOver()
	{
		int turn = GameLogic.GetTurn();
		int turnlimit = GameLogic.GetTurnLimit();

		if(turn > turnlimit)
		{
			if(!gameoverobjects.activeSelf)
			{
				gameoverobjects.SetActive(true);
			}
			Board.EndGame();
		}
		else
		{
			if(gameoverobjects.activeSelf)
			{
				gameoverobjects.SetActive(false);
			}
		}
	}
}