using System;
using UnityEngine;

public class Stage 
{
    Tile[,] Tiles { get; set; }
    Wall[,] HorizontalWalls { get; set; }
    Wall[,] VerticalWalls { get; set; }

    public int Width { get; private set; }
    public int Height { get; private set; }

    public Action<Tile> OnTileChanged { get; set; }
    public Action<Wall> OnWallChanged { get; set; }

    public Stage(int width = 20, int height = 8)
    {
        Resize(width, height);
        Debug.Log($"Stage created with {Tiles.Length} tiles.");
    }

    public void Resize(int width, int heigh)
    {
        if (Tiles != null)
            throw new NotImplementedException();

        Width = width;
        Height = heigh;

        Tiles = new Tile[Width, Height];
        for(int x = 0; x < Width; x++)
            for(int y = 0; y < Height; y++)
                Tiles[x, y] = new Tile(this, x, y);

        HorizontalWalls = new Wall[Width, Height+1];
        for (int x = 0; x < Width; x++)
            for (int y = 0; y <= Height; y++)
                HorizontalWalls[x, y] = new Wall(this, x, y, WallOrientation.Horizontal);

        VerticalWalls = new Wall[Width + 1, Height];
        for (int x = 0; x <= Width; x++)
            for (int y = 0; y < Height; y++)
                VerticalWalls[x, y] = new Wall(this, x, y, WallOrientation.Vertical);
    }

    public bool HasTile(int x, int y)
    {
        return !(x < 0 || y < 0 || x >= Width || y >= Height); //TODO: implement better
    }

    public bool HasWall(WallOrientation orientation, int x, int y)
    {
        if(orientation == WallOrientation.Horizontal)
            return (x >= 0 && y >= 0 && x < Width && y <= Height);

        if(orientation == WallOrientation.Vertical)
            return (x >= 0 && y >= 0 && x <= Width && y < Height);

        throw new NotImplementedException($"Unknown orientation {orientation}.");
    }

    public bool IsBorderWall(WallOrientation orientation, int x, int y)
    {
        if(!HasWall(orientation, x, y)) 
            return false;
        
        if (orientation == WallOrientation.Horizontal)
            return (y == 0 || y == Height);

        if (orientation == WallOrientation.Vertical)
            return (x == 0 || x == Width);

        throw new NotImplementedException($"Unknown orientation {orientation}.");
    }

    public Tile GetTileAt(int x, int y)
    {
        if (!HasTile(x, y))
            throw new Exception($"Trying to get tile {x},{y} from world({Width},{Height}).");

        var tile = Tiles[x, y];
        return tile;
    }

    public Wall GetWallAt(WallOrientation orientation, int x, int y)
    {
        if (!HasWall(orientation, x, y))
            throw new Exception($"Trying to get wall {x},{y} from world({Width},{Height}).");

        if(orientation == WallOrientation.Horizontal)
            return HorizontalWalls[x, y];

        if (orientation == WallOrientation.Vertical)
            return VerticalWalls[x, y];

        throw new System.NotImplementedException();
    }

    /*public void SetTile(int x, int y, Tile tile)
    {
        if(tile == null) throw new ArgumentNullException(tile.GetType().Name);

        if (!HasTile(x, y))
            throw new Exception($"Trying to get tile {x},{y} from world({Width},{Height}).");

        Tiles[x, y] = tile;
    }*/

    public Tile this[int x, int y]
    {
        get { return GetTileAt(x, y); }
        //set { SetTile(x, y, value); }
    }

    public Wall this[WallOrientation orientation, int x, int y]
    {
        get { return GetWallAt(orientation, x, y); }
    }

    public void Randomize()
    {
        for (int x = 0; x <= Width; x++)
            for (int y = 0; y <= Height; y++)
            {
                if(HasTile(x, y))
                {
                    if (UnityEngine.Random.Range(0, 2) == 0)
                        this[x, y].Type = TileType.Floor;
                    else
                        this[x, y].Type = TileType.Empty;
                }

                if (HasWall(WallOrientation.Horizontal, x, y))
                {
                    if (UnityEngine.Random.Range(0, 2) == 1)
                        this[WallOrientation.Horizontal, x, y].Type = WallType.Full;
                    else
                        this[WallOrientation.Horizontal, x, y].Type = WallType.Empty;
                }

                if (HasWall(WallOrientation.Vertical, x, y))
                {
                    if (UnityEngine.Random.Range(0, 2) == 1)
                        this[WallOrientation.Vertical, x, y].Type = WallType.Full;
                    else
                        this[WallOrientation.Vertical, x, y].Type = WallType.Empty;
                }
            }

        Debug.Log($"Randomizing a stage...");
    }

    public void Populate()
    {
        for (int x = 0; x < Width; x++)
            for (int y = 0; y < Height; y++)
                this[x, y].Type = TileType.Floor;

        for (int x = 0; x <= Width; x++)
            for (int y = 0; y <= Height; y++)
            {
                if(IsBorderWall(WallOrientation.Horizontal, x, y))
                    this[WallOrientation.Horizontal, x, y].Type = WallType.Full;

                if (IsBorderWall(WallOrientation.Vertical, x, y))
                    this[WallOrientation.Vertical, x, y].Type = WallType.Full;
            }

    }
}