using System;
using UnityEngine;
using Random = UnityEngine.Random;

public class HexGrid : MonoBehaviour
{
    public int width = 6;
    public int height = 6;

    public HexCell cellPrefab;
    HexMesh hexMesh;
    HexCell[] cells;

    public Color defaultColor = Color.white;
    public Color touchedColor = Color.magenta;

    void Awake()
    {
        hexMesh = GetComponentInChildren<HexMesh>();
        cells = new HexCell[height * width];

        for (int z = 0, i = 0; z < height; z++)
        {
            for (int x = 0; x < width; x++)
            {
                CreateCell(x, z, i++);
            }
        }
    }

    private void Start()
    {
        hexMesh.Triangulate(cells);
    }

    void CreateCell(int x, int z, int i)
    {
        Vector3 position;
        position.x = (x + z * 0.5f - z / 2) * (HexMetrics.innerRadius * 2f);
        position.y = 0f;
        position.z =  HexMetrics.offset * z;

        HexCell cell = cells[i] = Instantiate<HexCell>(cellPrefab);
        cell.transform.SetParent(transform, false);
        cell.transform.localPosition = position;
        cell.coordinates = HexCoordinates.FromOffsetCoordinates(x, z);
        cell.color = new Color(Random.Range(0,1f), Random.Range(0,1f), Random.Range(0,1f), 1);
        
    }

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            TouchCell(Input.mousePosition);
        }
    }

    public void TouchCell(Vector3 position)
    {
        position = transform.InverseTransformPoint(position);
        HexCoordinates coordinates = HexCoordinates.FromPosition(position);
        int index = coordinates.X + coordinates.Z * width + coordinates.Z / 2;
        HexCell cell = cells[index];
        cell.color = touchedColor;
        hexMesh.Triangulate(cells);
    }
}