#define Graph_And_Chart_PRO
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;

namespace ChartAndGraph
{
    [RequireComponent(typeof(MeshRenderer))]
    [RequireComponent(typeof(MeshFilter))]
    class BarMeshGenerator : BarGenerator
    {
        /// <summary>
        /// Sets the dimention of the generated mesh. can be either 2d or 3d
        /// </summary>
        public MeshDimention MeshDimention = MeshDimention._2D; 
        /// <summary>
        /// Sets the way materials are fit to the bar mesh
        /// </summary>
        public BarMaterialFit MaterialFit = BarMaterialFit.Stretch;
        /// <summary>
        /// Contains a mesh that was generate for this object only and should be destoryed once the object is cleaned
        /// </summary>
        Mesh mCleanMesh = null;
        /// <summary>
        /// the mesh filter for this object
        /// </summary>
        MeshFilter mFilter;

        MeshDimention mCurrentDimention;
        BarMaterialFit mCurrentMaterialFit;

        private bool EnsureMeshFilter()
        {
            if (mFilter == null)
                mFilter = GetComponent<MeshFilter>();
            if (mFilter == null)
                return false;
            return true;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="rect"></param>
        /// <param name="normalizedSize"></param>
        public override void Generate(float normalizedSize,float scale)
        {
            if (EnsureMeshFilter() == false)    // No mesh filter attached
                return;

            if(mFilter.sharedMesh != null)
            {
                if(MaterialFit == BarMaterialFit.Trim && mCurrentMaterialFit == BarMaterialFit.Trim)
                {
                    if(MeshDimention == mCurrentDimention)
                    {
                        if (MeshDimention == ChartAndGraph.MeshDimention._2D)
                            BarMesh.Update2DMeshUv(mFilter.sharedMesh, normalizedSize);
                        else
                            BarMesh.Update3DMeshUv(mFilter.sharedMesh, normalizedSize);
                        return;
                    }
                }
            }
            mCurrentDimention = MeshDimention;
            mCurrentMaterialFit = MaterialFit;
            if(MaterialFit == BarMaterialFit.Stretch)
            {
                if (MeshDimention == ChartAndGraph.MeshDimention._2D)
                    mFilter.sharedMesh = BarMesh.StrechMesh2D;
                else
                    mFilter.sharedMesh = BarMesh.StrechMesh3D;
                ChartCommon.CleanMesh(null, ref mCleanMesh);
                return;
            }

            if (MaterialFit == BarMaterialFit.Trim)
            {
                Mesh newMesh = null;
                if (MeshDimention == ChartAndGraph.MeshDimention._2D)
                    newMesh = BarMesh.Generate2DMesh(normalizedSize);
                else
                    newMesh = BarMesh.Generate3DMesh(normalizedSize);
                mFilter.sharedMesh = newMesh;
                ChartCommon.CleanMesh(newMesh, ref mCleanMesh);
            }
            else
                return; // should not happen ever
        }

        /// <summary>
        /// 
        /// </summary>
        public override void Clear()
        {
            ChartCommon.CleanMesh(null, ref mCleanMesh);
        }

        void OnDestroy()
        {
            Clear();
        }
    }
}