using System;
using System.Reflection;
using UnityEngine;
using UnityEditor;

// sortingLayer
// sortingOrder
// bounds
// bonecount
[CustomEditor(typeof(SkinnedMeshRenderer), true)]
[CanEditMultipleObjects]
public class SkinnedMeshRendererInspector : InspectorExt
{
    protected override string defaultEditorName => "UnityEditor.SkinnedMeshRendererEditor, UnityEditor";

    SkinnedMeshRenderer renderer;

    string s_BoundsIconPath = EditorGUIHelperSetUp.root + "Icons/bounds.png";
    GUIContent s_BoundsIcon;

    bool s_ShowBounds = false;

    public override void OnEnable()
    {
        base.OnEnable();
        renderer = target as SkinnedMeshRenderer;
        if (s_BoundsIcon == null)
            s_BoundsIcon = EditorGUIUtility.IconContent(s_BoundsIconPath);
        s_ShowBounds = false;
    }

    public override void OnDisable()
    {
        base.OnDisable();
        s_ShowBounds = false;
    }

    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();

        if (renderer == null)
            return;

        if(BeginMore())
        {
            string sortingLayer = renderer.sortingLayerName;
            string[] layers = new string[SortingLayer.layers.Length];
            int index = 0;
            for (int i = 0; i < layers.Length; ++i)
            {
                layers[i] = SortingLayer.layers[i].name;
                if (sortingLayer == layers[i])
                    index = i;
            }
            index = EditorGUILayout.Popup("Sorting Layer", index, layers);
            renderer.sortingLayerName = layers[index];
            renderer.sortingOrder = EditorGUILayout.IntField("Sorting Order", renderer.sortingOrder);
            s_ShowBounds = EditorGUIHelper.ToggleButton("Show Bounds", s_ShowBounds, s_BoundsIcon);
            Transform bone0 = renderer.bones != null && renderer.bones.Length > 0 ? renderer.bones[0] : null;
            GUI.enabled = false;
            EditorGUILayout.ObjectField("Bones[0]", bone0, typeof(Transform), true);
            GUI.enabled = true;
            //EditorGUIHelper.LabelField("Bone Count",  GetBoneCount(bone0).ToString());
            EditorGUIHelper.LabelField("Bones Length", renderer.bones.Length.ToString());

            // Mesh info 
            Mesh mesh = renderer.sharedMesh;
            if(mesh)
            {
                EditorGUIHelper.LabelField("Mesh Info", "Vertex Count (VBO): " + mesh.vertexCount);
                EditorGUIHelper.LabelFieldRight("Topology Count (IBO): " + mesh.triangles.Length);
                EditorGUIHelper.LabelFieldRight("Possible Triangles Count: " + mesh.triangles.Length / 3);
                EditorGUIHelper.LabelFieldRight("SubMesh Count: " + mesh.subMeshCount);
                EditorGUIHelper.LabelFieldRight("Attributes: " + GetAttributesEnabled());
            }
        }
        EndMore();
    }


    private int GetBoneCount(Transform root)
    {
        if (root == null)
            return 0;
        int childCount = root.childCount;
        for (int i = 0; i < root.childCount; ++i)
        {
            childCount += GetBoneCount(root.GetChild(i));
        }
        return childCount;
    }

    public override void OnSceneGUI()
    {
        base.OnSceneGUI();
        if (s_ShowBounds)
        {
            Vector3 center = renderer.bounds.center;
            float radius = renderer.bounds.extents.magnitude;
            Handles.color = Color.white;
            EditorHandlesHelper.WireCube(center, renderer.bounds.size, Color.blue);
            Handles.color = Color.white;
            EditorHandlesHelper.Label(center, "bounds:" + renderer.bounds.size, Color.blue);
        }
    }

    private string GetAttributesEnabled()
    {
        if (renderer == null)
            return "";
        string attr = "";
        Mesh mesh = renderer.sharedMesh;
        if (mesh.vertices.Length > 0) attr += "[position] ";
        if (mesh.normals.Length > 0) attr += "[normal] ";
        if (mesh.tangents.Length > 0) attr += "[tangent] ";
        if (mesh.colors.Length > 0) attr += "[color] ";
        if (mesh.uv.Length > 0) attr += "[uv1] ";
        if (mesh.uv2.Length > 0) attr += "[uv2] ";
        if (mesh.uv3.Length > 0) attr += "[uv3] ";
        if (mesh.uv4.Length > 0) attr += "[uv4] ";
#if UNITY_2019 || UNITY_2020 || UNITY_2021
        if (mesh.uv5.Length > 0) attr += "[uv5] ";
        if (mesh.uv6.Length > 0) attr += "[uv6] ";
        if (mesh.uv7.Length > 0) attr += "[uv7] ";
        if (mesh.uv8.Length > 0) attr += "[uv8] ";
#endif
        if (mesh.boneWeights.Length > 0) attr += "[boneWeights] ";
        return attr;
    }

}