using System;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.TextCore.Text;

public class MusicSheetRenderer : MonoBehaviour
{
    // Start is called before the first frame update

    public FontAsset TextFont;
    public Material TextMaterial;
    void Start()
    {
       
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    public GameObject MakeGlyphObject(uint unicodeValue) {
        //0x1D11E

        var glyphObject = new GameObject("Glyph_" + unicodeValue.ToString("X"));
        glyphObject.transform.localPosition = Vector3.zero;

        var mr = glyphObject.AddComponent<MeshRenderer>();
        mr.sharedMaterial = TextMaterial;

        var mf = glyphObject.AddComponent<MeshFilter>();
        var mesh = new Mesh();

        var character = TextFont.characterLookupTable[unicodeValue];
        
        var w = character.glyph.glyphRect.width;
        var h = character.glyph.glyphRect.height;

        var maxHeight = TextFont.faceInfo.ascentLine - TextFont.faceInfo.descentLine;

        var fw = (float)w / maxHeight;
        var fh = (float)h / maxHeight;

        var vOffset = (character.glyph.metrics.horizontalBearingY - h) / maxHeight;

        mesh.vertices = new Vector3[4]{
            new Vector3(0,0 + vOffset,0),
            new Vector3(0,fh+ vOffset,0),
            new Vector3(fw,fh+ vOffset,0),
            new Vector3(fw,0+ vOffset,0),
        };

        mesh.triangles = new int[6] {
            0, 1, 2,
            0, 2, 3
        };

     
        Vector2 uvXY = new Vector2((float)character.glyph.glyphRect.x / TextFont.atlasWidth, (float)character.glyph.glyphRect.y / TextFont.atlasHeight);
        Vector2 uvWH = new Vector2((float)character.glyph.glyphRect.width / TextFont.atlasWidth, (float)character.glyph.glyphRect.height / TextFont.atlasHeight);

        Vector2 uvMax = uvXY + uvWH;

        //𝄞   1D11E
        mesh.uv = new Vector2[] {
            new Vector2 (uvXY.x, uvXY.y),
            new Vector2 (uvXY.x,uvMax.y),
            new Vector2 (uvMax.x,uvMax.y),
            new Vector2 (uvMax.x,uvXY.y),
        };

        mf.sharedMesh = mesh;

        return glyphObject;
    }

    public static uint[] GetUtf32CodePoints(string text) {
        byte[] bytes = System.Text.Encoding.UTF32.GetBytes(text);
        uint[] result = new uint[bytes.Length / 4];
        Buffer.BlockCopy(bytes, 0, result, 0, bytes.Length);
        return result;
    }

    public void MakeString(string text) {
        var codePoints = GetUtf32CodePoints(text);

        for(int i = 0; i < codePoints.Length; i++) {
            var glyph = MakeGlyphObject(codePoints[i]);
            glyph.transform.localPosition += new Vector3(i, 0, 0);
        }
    }
}


[CustomEditor(typeof(MusicSheetRenderer))]
[CanEditMultipleObjects]
public class LookAtPointEditor : Editor {
    SerializedProperty lookAtPoint;

    void OnEnable() {
        
        lookAtPoint = serializedObject.FindProperty("lookAtPoint");
        //UnityEngine.TextCore.LowLevel.FontEngine.LoadFontFace((target as MusicSheetRenderer).TextFont);
      
        //obj.TextFont.
    }

    public override void OnInspectorGUI() {
        base.OnInspectorGUI();
        if(GUILayout.Button("Test font")) {
            var obj = (target as MusicSheetRenderer);
            obj.MakeString("𝄢𝄚𝄞𝄀𝄆𝅗𝅥");
           
        }
    }
}