using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

public static class MineSweeperConstants
{

    private static Texture2D Cell_Button;
    private static Texture2D Cell_Clicked;
    private static GUIStyle Button_Style;
    private static GUIStyle Clicked_Style;

    /// <summary>
    /// Height and Width of a Cell in Pixels
    /// </summary>
    public static int CELL_SIZE { get { return 20; } }

    /// <summary>
    /// Texture of Cell when it hasn't been clicked
    /// </summary>
    public static Texture2D CELL_BUTTON
    {
        get
        {
            if (Cell_Button == null)
            {
                Cell_Button = CreateButtonTexture(Color.white, new Color(0.75f, 0.75f, 0.75f), Color.black);
                Debug.Log("Generating CELL_BUTTON");
            }

            return Cell_Button;
        }
    }

    /// <summary>
    /// Texture of Cell when it has been clicked
    /// </summary>
    public static Texture2D CELL_CLICKED
    {
        get
        {
            if (Cell_Clicked == null)
            {
                Cell_Clicked = CreateButtonTexture(new Color(0.2f, 0.2f, 0.2f), new Color(0.75f, 0.75f, 0.75f), new Color(0.8f, 0.8f, 0.8f));
                Debug.Log("Generating CELL_CLicked");
            }

            return Cell_Clicked;
        }
    }

    /// <summary>
    /// Style to use with a Cell_Button
    /// </summary>
    public static GUIStyle STYLE_CELL_BUTTON
    {
        get
        {
            if (Button_Style == null)
            {
                Debug.Log("Creating Cell Style");
                Button_Style = new GUIStyle();
                Button_Style.alignment = TextAnchor.MiddleCenter;
                Button_Style.normal.background = CELL_BUTTON;
            }
            return Button_Style;
        }
    }

    /// <summary>
    /// Style to use with a Cell_Button
    /// </summary>
    public static GUIStyle STYLE_CELL_CLICKED
    {
        get
        {
            if (Clicked_Style == null)
            {
                Debug.Log("Creating Cell Style Clicked");
                Clicked_Style = new GUIStyle();
                Clicked_Style.alignment = TextAnchor.MiddleCenter;
                Clicked_Style.normal.background = CELL_CLICKED;
            }
            return Clicked_Style;
        }
    }

    private static Texture2D CreateButtonTexture(Color highLight, Color mainColor, Color lowLight)
    {
        Texture2D retval = new Texture2D(CELL_SIZE, CELL_SIZE);

        for (int i = 0; i < CELL_SIZE; i++)
        {
            for (int j = 0; j < CELL_SIZE; j++)
            {
                if (i == 0 || j == CELL_SIZE - 1)
                {
                    retval.SetPixel(i, j, highLight);
                }
                else if (i == CELL_SIZE - 1 || j == 0)
                {
                    retval.SetPixel(i, j, lowLight);
                }
                else
                    retval.SetPixel(i, j, mainColor);
            }
        }
        retval.Apply();
        return retval;
    }
}

public class Board
{
    private Cell[,] Cells;
    private int MineCount = 10;


    public Board(Vector2Int Size)
    {
        Cells = new Cell[Size.x, Size.y];

        for (int i = 0; i < Size.x; i++)
            for (int j = 0; j < Size.y; j++)
                Cells[i, j] = new Cell(this, new Vector2Int(i, j));

        PlaceMines(new Vector2Int(0, 0));
    }

    public void OnGUI()
    {
        foreach (Cell cell in Cells)
            cell.DrawCell();
    }

    public void OnClick()
    {
        Event e = Event.current;
        if (e.type == EventType.MouseUp)
        {
            foreach (Cell cell in Cells)
                cell.OnClick(e.button, e.mousePosition);
        }
    }

    public Cell[] AdjacentCells(Vector2Int coords)
    {
        List<Cell> retVal = new List<Cell>();

        for (int i = -1; i <= 1; i++)
        {

            if (coords.x + i < 0 || coords.x + i >= Cells.GetLength(0))
                continue;

            for (int j = -1; j <= 1; j++)
            {
                if (coords.y + j < 0 || coords.y + j >= Cells.GetLength(0))
                    continue;
                if (i == 0 && j == 0)
                    continue;

                retVal.Add(Cells[coords.x + i, coords.y + j]);
            }
        }
        return retVal.ToArray();
    }

    public void PlaceMines(Vector2Int startPos)
    {
        int placedMines = 0;
        while (placedMines < MineCount)
        {
            int x = Random.Range(0, Cells.GetLength(0) - 1);
            int y = Random.Range(0, Cells.GetLength(1) - 1);

            if (!Cells[x, y].containsMine || startPos != new Vector2Int(x,y))
            {
                Cells[x, y].containsMine = true;
                Debug.Log("Mine at: (" + x + ", " + y + ")");
                placedMines++;
            }
        }
    }

}

public class Cell
{
    public enum Mark { None,Flag,Question}

    public bool isClicked = false;
    public bool containsMine = false;
    public int adjacentMines = 0;

    public Board board;
    private Rect rect;

    Vector2Int coords;
    public bool isMarked = false;


    public Cell(Board board, Vector2Int coords)
    {
        this.board = board;
        this.coords = coords;

        rect = new Rect(coords.x * MineSweeperConstants.CELL_SIZE + 1, coords.y * MineSweeperConstants.CELL_SIZE + 1, MineSweeperConstants.CELL_SIZE, MineSweeperConstants.CELL_SIZE);
    }

    public void DrawCell()
    {
        if (!isClicked)
        {
            if (isMarked)
                GUI.Label(rect, "!", MineSweeperConstants.STYLE_CELL_BUTTON);
            else
            {
                GUI.Label(rect, "", MineSweeperConstants.STYLE_CELL_BUTTON);
            }

        }
        else
        {
            if (containsMine)
                GUI.Label(rect, "X", MineSweeperConstants.STYLE_CELL_CLICKED);
            else
            {
                MineSweeperConstants.STYLE_CELL_CLICKED.normal.textColor = MineSweeperEditor.getColor(adjacentMines);
                GUI.Label(rect, adjacentMines.ToString(), MineSweeperConstants.STYLE_CELL_CLICKED);
                MineSweeperConstants.STYLE_CELL_CLICKED.normal.textColor = Color.black;
            }
        }
    }

    public void OnClick(int button, Vector2 mousePos)
    {
        if (rect.Contains(mousePos))
        {
            if (button == 0)
                DoLeftClick();
            else if (button == 1)
                DoRightClick();
        }
    }

    private void DoLeftClick()
    {
        if (isClicked)
            return;

        isClicked = true;

        Cell[] adjacentCells = board.AdjacentCells(coords);

        foreach (Cell cell in adjacentCells)
        {
            if (cell.containsMine)
                adjacentMines++;
        }

        if (adjacentMines == 0 && !containsMine)
            foreach (Cell cell in adjacentCells)
                if (!cell.isClicked)
                    cell.DoLeftClick();

    }

    private void DoRightClick()
    {
        isMarked = !isMarked;
    }
}

public struct Vector2Int
{
    public int x;
    public int y;

    public Vector2Int(int x, int y)
    {
        this.x = x;
        this.y = y;
    }

    public override bool Equals(System.Object obj)
    {
        return obj is Vector2Int && this == (Vector2Int)obj;
    }
    public override int GetHashCode()
    {
        return x.GetHashCode() ^ y.GetHashCode();
    }
    public static bool operator ==(Vector2Int x, Vector2Int y)
    {
        return x.x == y.x && x.y == y.y;
    }
    public static bool operator !=(Vector2Int x, Vector2Int y)
    {
        return !(x == y);
    }
}