using UnityEngine;
using UnityEngine.UI;

using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class TextPlus : Text
{
    #region

    public int LeftIndex;
    public int RightIndex;
    public int BreakIndex;

    public bool Draw;
    public float Width;
    public float Height;
    public string SpriteName;
    public SpriteInfo SpriteInfo;

    public ImagePlus ImagePlus
    {
        get
        {
            if (_ImagePlus == null)
            {
                _ImagePlus = GetComponentInChildren<ImagePlus>();
            }

            return _ImagePlus;
        }
        set { _ImagePlus = value; }
    }

    private ImagePlus _ImagePlus;

    #endregion

    protected override void OnPopulateMesh(VertexHelper toFill)
    {
        base.OnPopulateMesh(toFill);

        if (ImagePlus == null)
        {
            Debug.LogWarning("There is no ImagePlus");

            return;
        }

        LeftIndex = text.IndexOf("<(");
        RightIndex = text.IndexOf(")>");

        if (LeftIndex == -1 || RightIndex == -1)
        {
            Draw = false;
        }
        else
        {
            SpriteName = text.Between(LeftIndex + 2, RightIndex - 1);

            if (SpriteAsset.SpriteInfoDic.TryGetValue(SpriteName, out SpriteInfo))
            {
                Draw = true;
            }
            else
            {
                Draw = false;
            }
        }

        if (Draw)
        {
            Draw = false;
            
            UIVertex[] vertices = new UIVertex[4];

            List<UIVertex> vertexList = new List<UIVertex>();

            toFill.GetUIVertexStream(vertexList);
            
            int row = text.Split('\n').Length;

            if (row == 1)
            {
                BreakIndex = text.Length;
            }
            else
            {
                BreakIndex = text.IndexOf('\n');
            }

            Height = preferredHeight/row;

            Width = (Height / SpriteInfo.Height) * SpriteInfo.Width;

            Vector3 centerLeft;

            if (LeftIndex == 0)
            {
                centerLeft = (vertexList[LeftIndex * 6 + 4].position + vertexList[LeftIndex * 6 + 5].position) / 2;
            }
            else
            {
                centerLeft = (vertexList[(LeftIndex -1)* 6 + 1].position + vertexList[(LeftIndex - 1)*6 + 2].position) / 2;
            }

            vertices[0].position = centerLeft + new Vector3(0, -Height/2, 0);
            vertices[1].position = centerLeft + new Vector3(0, Height/2, 0);
            vertices[2].position = centerLeft + new Vector3(Width, Height/2, 0);
            vertices[3].position = centerLeft + new Vector3(Width, -Height/2, 0);

            vertices[0].color = Color.white;
            vertices[1].color = Color.white;
            vertices[2].color = Color.white;
            vertices[3].color = Color.white;

            vertices[0].uv0 = SpriteAsset.SpriteInfoDic[SpriteName].UvList[0];
            vertices[1].uv0 = SpriteAsset.SpriteInfoDic[SpriteName].UvList[1];
            vertices[2].uv0 = SpriteAsset.SpriteInfoDic[SpriteName].UvList[2];
            vertices[3].uv0 = SpriteAsset.SpriteInfoDic[SpriteName].UvList[3];

            UIVertex vertex = new UIVertex();

            for (int i = LeftIndex; i < RightIndex + 2; i++)
            {
                toFill.SetUIVertex(vertex, i*4);
                toFill.SetUIVertex(vertex, i*4 + 1);
                toFill.SetUIVertex(vertex, i*4 + 2);
                toFill.SetUIVertex(vertex, i*4 + 3);
            }

            if (LeftIndex == 0)
            {
                float offsetX1 = vertexList[(RightIndex + 2) * 6].position.x - vertices[3].position.x;

                float offsetX2 = (vertexList[(BreakIndex - 1) * 6 + 1].position.x + vertices[0].position.x - offsetX1) / 2;

                for (int i = RightIndex + 2; i < BreakIndex; i++)
                {
                    vertex = vertexList[i * 6];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4);

                    vertex = vertexList[i * 6 + 1];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 1);

                    vertex = vertexList[i * 6 + 2];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 2);

                    vertex = vertexList[i * 6 + 4];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 3);
                }

                vertices[0].position.x -= offsetX2;
                vertices[1].position.x -= offsetX2;
                vertices[2].position.x -= offsetX2;
                vertices[3].position.x -= offsetX2;
            }
            else
            {
                float offsetX1 = vertexList[(RightIndex + 2) * 6].position.x - vertices[3].position.x;

                float offsetX2 = (vertexList[(BreakIndex - 1) * 6 + 1].position.x + vertexList[0].position.x - offsetX1) / 2;

                for (int i = 0; i < LeftIndex; i++)
                {
                    vertex = vertexList[i * 6];
                    vertex.position.x -= offsetX2;
                    toFill.SetUIVertex(vertex, i * 4);

                    vertex = vertexList[i * 6 + 1];
                    vertex.position.x -= offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 1);

                    vertex = vertexList[i * 6 + 2];
                    vertex.position.x -= offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 2);

                    vertex = vertexList[i * 6 + 4];
                    vertex.position.x -= offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 3);
                }

                for (int i = RightIndex + 2; i < BreakIndex; i++)
                {
                    vertex = vertexList[i * 6];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4);

                    vertex = vertexList[i * 6 + 1];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 1);

                    vertex = vertexList[i * 6 + 2];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 2);

                    vertex = vertexList[i * 6 + 4];
                    vertex.position.x -= offsetX1 + offsetX2;
                    toFill.SetUIVertex(vertex, i * 4 + 3);
                }

                vertices[0].position.x -= offsetX2;
                vertices[1].position.x -= offsetX2;
                vertices[2].position.x -= offsetX2;
                vertices[3].position.x -= offsetX2;
            }

            ImagePlus.UpdateStatus(true, new VertexHelper(), vertices.ToList());
        }
        else
        {
            ImagePlus.UpdateStatus(false, new VertexHelper(), null);
        }
    }
}