using System;
using System.Collections.Generic;
using UnityEngine;
using Random = UnityEngine.Random;

namespace Test
{
    [RequireComponent(typeof(MeshFilter)), RequireComponent(typeof(MeshRenderer))]
    public class TestMesh : MonoBehaviour
    {
        Mesh mesh;

        private void Awake()
        {
            mesh = new Mesh();

            // 定义顶点数组
            List<Vector3> vertices = new List<Vector3>();

            // 定义三角形数组，每个三角形由三个顶点的索引组成
            List<int> triangles = new List<int>();
            List<Color> colors = new List<Color>();

            for (int z = 0; z < 3; z++)
            {
                for (int x = 0; x < 3; x++)
                {
                    var center =  new Vector3(
                        // (x + z * 0.5f - z / 2)： x加上z的一半，再减去z的一半的整数值
                        (x + z * 0.5f - z / 2) * (HexMetrics.innerRadius * 2f),
                        0,
                        HexMetrics.offset * z);

                    Color color = new Color(Random.Range(0,1f), Random.Range(0,1f), Random.Range(0,1f), 1);
                    for (int i = 0; i < 6; i++)
                    {
                        var verticesCount = vertices.Count;
                        vertices.Add(center);
                        vertices.Add(center + HexMetrics.corners[i]);
                        vertices.Add(center + HexMetrics.corners[i + 1]);

                        triangles.Add(verticesCount);
                        triangles.Add(verticesCount + 1);
                        triangles.Add(verticesCount + 2);
                        colors.Add(color);
                        colors.Add(color);
                        colors.Add(color);
                    }
                }
            }


            mesh.vertices = vertices.ToArray();
            mesh.colors = colors.ToArray();
            mesh.triangles = triangles.ToArray();

            // 计算法线
            mesh.RecalculateNormals();

            GetComponent<MeshFilter>().mesh = mesh;
            // 为 MeshRenderer 指定材质
            // GetComponent<MeshRenderer>().material = new Material(Shader.Find("Standard"));
        }

    }
}