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

public class GameController : MonoBehaviour {

    public Button grassPrefab, waterPrefab, roadPrefab, housePrefab;
    public Button[,] buttonList = new Button[15,15];
    public Canvas canvas;
    public Text countText;

    private int count;

    private int[,] grid = new int[15, 15]
    {
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 2, 3, 0, 0, 0, 0, 0, 0 },
        { 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0 }
    };

    private int selectedItem;
    private int money = 0;

    private void Awake()
    {
        selectedItem = 2;
        DrawBoard();
        SetCountText();
    }

    private int GetOccurences(int[,] grid, int x)
    {
        var result = 0;

        for(var i = 0; i < grid.GetLength(0); i++)
        {
            for (var j = 0; j < grid.GetLength(1); j++)
            {
                if (grid[i, j] == x)
                    result++;
            }
        }

        return result;
    }

    Button GetSelectedPrefab(int cell)
    {
        Button selectedPrefab = roadPrefab;
        if(cell == 0)
        {
            selectedPrefab = grassPrefab;
        } else if(cell == 1)
        {
            selectedPrefab = waterPrefab;
        } else if(cell == 2)
        {
            selectedPrefab = roadPrefab;
        } else if(cell == 3)
        {
            selectedPrefab = housePrefab;
        }

        return selectedPrefab;
    }

    void DrawBoard ()
    {
        for(int y = 0; y < 15; y++)
        {
            for(int x = 0; x < 15; x++)
            {
                buttonList[y,x] = (Button) GameObject.Instantiate(GetSelectedPrefab(grid[y,x]), new Vector3(x * 36f - 256, y * 36f - 256, 0), Quaternion.identity);
                buttonList[y,x].transform.SetParent(canvas.transform, false);
                buttonList[y,x].GetComponentInParent<GridSpace>().SetXY(x, y);
                buttonList[y,x].GetComponentInParent<GridSpace>().SetGameControllerReference(this);
            }
        }
    }

    public int GetSelectedItem ()
    {
        return selectedItem;
    }

    public void SetSelectedItem(int id)
    {
        selectedItem = id;
    }

    private void SetCountText()
    {
        countText.text = "Huizen: " + GetOccurences(this.grid, 3);
    }

    public void SpaceSet(int x, int y)
    {
        if (IsAllowed(x, y, selectedItem, money))
        {
            grid[y, x] = selectedItem;

            SetCountText();

            foreach (Button child in canvas.GetComponents<Button>())
            {
                Destroy(child);
            }

            DrawBoard();
        } else
        {
            Debug.Log("Not allowed!!");
        }

    }

    private bool IsAllowed(int x, int y, int selectedItem, int money)
    {
        // If the selected tile is water, return false
        if(grid[y,x] == 1)
        {
            return false;
        }

        // Trying to place a road or house
        if(selectedItem == 2 || selectedItem == 3)
        {
            // If the selected tile is a road or house, return false
            if(grid[y,x] == 2 || grid[y,x] == 3)
            {
                return false;
            } else
            {
                // If the selected tile connects to another road, return true
                try
                {
                    if (grid[y - 1, x] == 2 || grid[y + 1, x] == 2 || grid[y, x - 1] == 2 || grid[y, x + 1] == 2)
                    {
                        return true;
                    }
                } catch
                {
                    // Just to avoid array out of bounds exceptions 🤷
                }
            }
        }

        return false;
    }

}