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

[ExecuteInEditMode]
public class MineCraftCharacter : MonoBehaviour
{
    public Transform[] bonse;
    SkinnedMeshRenderer smr;
    private void Awake()
    {
        CreateCharacter c = new CreateCharacter();
        Mesh m = c.GetCharacterMesh(bonse, transform);
        MeshFilter mf = GetComponent<MeshFilter>();
        mf.mesh = m;

        smr = GetComponent<SkinnedMeshRenderer>();
        smr.bones = bonse;
        smr.sharedMesh = m;

        smr.quality = SkinQuality.Bone1;
    }
}

public class CreateCharacter
{
    int vertexCount = 24;
    int triangleCount = 36;
    int uvCount = 24;
    int cubeCount = 6;

    Vector3[] vertices;
    int[] triangles;
    Vector2[] uv;
    Mesh m;

    public Mesh GetCharacterMesh(Transform[] bones, Transform tf)
    {

        vertices = new Vector3[vertexCount * cubeCount];
        triangles = new int[triangleCount * cubeCount];
        uv = new Vector2[uvCount * cubeCount];

        m = new Mesh();

        for (int i = 0; i < vertexCount; i++)//버텍스 생성
        {
            vertices[i] = CreateMeshCube(new Vector3(-5, -5, -5), 5f, 5f, 5f)[i];//머리
            vertices[i + vertexCount] = CreateMeshCube(new Vector3(-10f, -20f, -5), 2.5f, 2.5f, 7.5f)[i];//왼팔
            vertices[i + vertexCount * 2] = CreateMeshCube(new Vector3(5f, -20f, -5), 2.5f, 2.5f, 7.5f)[i];//오른팔
            vertices[i + vertexCount * 3] = CreateMeshCube(new Vector3(-5f, -20f, -5), 2.5f, 5f, 7.5f)[i];//몸통
            vertices[i + vertexCount * 4] = CreateMeshCube(new Vector3(-5f, -35f, -5), 2.5f, 2.5f, 7.5f)[i];//오른다리
            vertices[i + vertexCount * 5] = CreateMeshCube(new Vector3(0f, -35f, -5), 2.5f, 2.5f, 7.5f)[i];//왼다리

        }

        for (int i = 0; i < triangleCount; i++)//두르기
        {
            for (int j = 0; j < cubeCount; j++)
                triangles[i + triangleCount * j] = GetTriangles(j + 1)[i];
        }

        for (int i = 0; i < uvCount; i++)//uv그리기
        {
            uv[i] = DrawUVCube(new Vector2(0f, 6f / 8f), 1f, 1f, 1f)[i];//머리
            uv[i + uvCount] = DrawUVCube(new Vector2(5f / 8f, 4f / 8f), 0.5f, 0.5f, 1.5f)[i];//왼팔
            uv[i + uvCount * 2] = DrawUVCube(new Vector2(4f / 8f, 0f), 0.5f, 0.5f, 1.5f)[i];//오른팔
            uv[i + uvCount * 3] = DrawUVCube(new Vector2(2f / 8f, 4f / 8f), 0.5f, 1f, 1.5f)[i];//몸통
            uv[i + uvCount * 4] = DrawUVCube(new Vector2(0f, 4f / 8f), 0.5f, 0.5f, 1.5f)[i];//오른다리
            uv[i + uvCount * 5] = DrawUVCube(new Vector2(2f / 8f, 0), 0.5f, 0.5f, 1.5f)[i];//왼다리

        }

        m.vertices = vertices;
        m.triangles = triangles;
        m.uv = uv;

        SetBoneWeight(bones,tf);

        return m;
    }

    //버텍스 생성
    Vector3[] CreateMeshCube(Vector3 startPos, float horiz, float vertical, float height)//시작점, 크기
    {
        Vector3[] reVal;
        reVal = new Vector3[] {

           new Vector3(startPos.x,startPos.y,startPos.z+horiz*2f),
           new Vector3(startPos.x,startPos.y+height*2f,startPos.z+horiz*2f),
           new Vector3(startPos.x,startPos.y+height*2f,startPos.z),
           new Vector3(startPos.x,startPos.y,startPos.z),//오른쪽

           new Vector3(startPos.x,startPos.y,startPos.z),
           new Vector3(startPos.x,startPos.y+height*2f, startPos.z),
           new Vector3(startPos.x+vertical*2f,startPos.y+height*2f,startPos.z),
           new Vector3(startPos.x+vertical*2f,startPos.y, startPos.z),//앞

           new Vector3(startPos.x+vertical*2f,startPos.y,startPos.z),
           new Vector3(startPos.x+vertical*2f,startPos.y+height*2f,startPos.z),
           new Vector3(startPos.x+vertical*2f,startPos.y+height*2f,startPos.z+horiz*2f),
           new Vector3(startPos.x+vertical*2f,startPos.y,startPos.z+horiz*2f),//왼

           new Vector3(startPos.x+vertical*2f,startPos.y,startPos.z+horiz*2f),
           new Vector3(startPos.x+vertical*2f,startPos.y+height*2f,startPos.z+horiz*2f),
           new Vector3(startPos.x,startPos.y+height*2f,startPos.z+horiz*2f),
           new Vector3(startPos.x,startPos.y,startPos.z+horiz*2f),//뒤

           new Vector3(startPos.x+vertical*2f,startPos.y+height*2f,startPos.z+horiz*2f),
           new Vector3(startPos.x+vertical*2f,startPos.y+height*2f,startPos.z),
           new Vector3(startPos.x,startPos.y+height*2f,startPos.z),
           new Vector3(startPos.x,startPos.y+height*2f,startPos.z+horiz*2f),//위

           new Vector3(startPos.x+vertical*2f,startPos.y,startPos.z),
           new Vector3(startPos.x+vertical*2f,startPos.y,startPos.z+horiz*2f),
           new Vector3(startPos.x,startPos.y,startPos.z+horiz*2f),
           new Vector3(startPos.x,startPos.y,startPos.z),//밑

        };


        return reVal;
    }

    //두르기 순서
    int[] GetTriangles(int count)
    {
        int[] reVal = new int[36];
        count -= 1;
        count *= 24;

        reVal = new int[]
        {
            count+0,count+1,count+2,
            count+0,count+2,count+3,//오

            count+4,count+5,count+6,
            count+4,count+6,count+7,//앞

            count+8,count+9,count+10,
            count+8,count+10,count+11,//왼

            count+12,count+13,count+14,
            count+12,count+14,count+15,//뒤

            count+16,count+17,count+18,
            count+16,count+18,count+19,//위

            count+20,count+21,count+22,
            count+20,count+22,count+23//아래
        };
        return reVal;
    }

    //uv씌우기
    Vector2[] DrawUVCube(Vector2 startPos, float horiz, float vertical, float height)//시작점, 크기
    {
        Vector2[] reVal = new Vector2[]
        {
            new Vector2((0f * vertical/8f) + 0f * (horiz/8f) + startPos.x,startPos.y),
            new Vector2((0f * vertical/8f) + 0f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((0f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((0f * vertical/8f) + 1f * (horiz/8f) + startPos.x, startPos.y),//오

            new Vector2((0f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y),
            new Vector2((0f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x, startPos.y),//앞

            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y),
            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((2f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((2f * vertical/8f) + 1f * (horiz/8f) + startPos.x, startPos.y),//뒤

            new Vector2((2f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y),
            new Vector2((2f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((2f * vertical/8f) + 2f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((2f * vertical/8f) + 2f * (horiz/8f) + startPos.x, startPos.y),//왼


            new Vector2((0f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((0f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f + horiz/8f),
            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f + horiz/8f),
            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),//위

            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),
            new Vector2((1f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f + horiz/8f),
            new Vector2((2f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f + horiz/8f),
            new Vector2((2f * vertical/8f) + 1f * (horiz/8f) + startPos.x,startPos.y + height/8f),//아래
        };
        return reVal;
    }

    void SetBoneWeight(Transform[] bones, Transform tf)
    {
        Matrix4x4[] transformData;
        BoneWeight[] bwData;

        transformData = new Matrix4x4[6];

        for (int i = 0; i < 6; i++)
        {
            transformData[i] = bones[i].worldToLocalMatrix * tf.localToWorldMatrix;
        }
        bwData = new BoneWeight[vertexCount * cubeCount];

        for(int i=0;i< vertexCount * cubeCount; i++)
        {
            int tmp = i / vertexCount;
            bwData[i] = new BoneWeight() { boneIndex0 = tmp, weight0 = 1.0f };
        }
        m.bindposes = transformData;
        m.boneWeights = bwData;
    }
}