using System;
using UnityEditor;
using UnityEngine;
using MeshUtility.M17N;

namespace VRM
{
    [CustomEditor(typeof(VRMExportSettings))]
    public class VRMExportSettingsEditor : Editor
    {
        class CheckBoxProp
        {
            public SerializedProperty Property;
            public Func<string> Description;

            public CheckBoxProp(SerializedProperty property, Func<string> desc)
            {
                Property = property;
                Description = desc;
            }

            public CheckBoxProp(SerializedProperty property, Options desc) : this(property, () => Msg(desc))
            {
            }

            public CheckBoxProp(SerializedProperty property, string desc) : this(property, () => desc)
            {
            }

            public void Draw()
            {
                EditorGUILayout.PropertyField(Property);
                EditorGUILayout.HelpBox(Description(), MessageType.None);
                EditorGUILayout.Space();
            }
        }

        /// <summary>
        /// エクスポート時にヒエラルキーの正規化を実施する
        /// </summary>
        [Tooltip("Require only first time")]
        public bool PoseFreeze = true;

        /// <summary>
        /// エクスポート時に新しいJsonSerializerを使う
        /// </summary>
        [Tooltip("Use new JSON serializer")]
        public bool UseExperimentalExporter = false;

        /// <summary>
        /// BlendShapeのシリアライズにSparseAccessorを使う
        /// </summary>
        [Tooltip("Use sparse accessor for blendshape. This may reduce vrm size")]
        public bool UseSparseAccessor = false;

        /// <summary>
        /// BlendShapeのPositionのみをエクスポートする
        /// </summary>
        [Tooltip("UniVRM-0.54 or later can load it. Otherwise fail to load")]
        public bool OnlyBlendshapePosition = false;

        /// <summary>
        /// エクスポート時にBlendShapeClipから参照されないBlendShapeを削除する
        /// </summary>
        [Tooltip("Remove blendshape that is not used from BlendShapeClip")]
        public bool ReduceBlendshape = false;

        /// <summary>
        /// skip if BlendShapeClip.Preset == Unknown
        /// </summary>
        [Tooltip("Remove blendShapeClip that preset is Unknown")]
        public bool ReduceBlendshapeClip = false;

        CheckBoxProp m_poseFreeze;
        CheckBoxProp m_useSparseAccessor;
        CheckBoxProp m_onlyBlendShapePosition;
        CheckBoxProp m_reduceBlendShape;
        CheckBoxProp m_reduceBlendShapeClip;

        static string Msg(Options key)
        {
            return MeshUtility.M17N.Getter.Msg(key);
        }

        enum Options
        {
            [LangMsg(Languages.ja, "エクスポート時に強制的にT-Pose化する。これを使わずに手動でT-Poseを作っても問題ありません")]
            [LangMsg(Languages.en, "Force T-Pose before export. Manually making T-Pose for model without enabling this is ok")]
            FORCE_T_POSE,

            [LangMsg(Languages.ja, "エクスポート時に正規化(ヒエラルキーから回転と拡大縮小を取り除くためにベイク)する")]
            [LangMsg(Languages.en, "Model's normalization (bake to remove roation and scaling from the hierarchy)")]
            NORMALIZE,

            [LangMsg(Languages.ja, "エクスポート時に新しいJsonSerializerを使う")]
            [LangMsg(Languages.en, "The new version of JsonSerializer for model export")]
            USE_GENERATED_SERIALIZER,

            [LangMsg(Languages.ja, "BlendShapeの容量を GLTF の Sparse Accessor 機能で削減する。修正中: UniGLTF以外でロードできません")]
            [LangMsg(Languages.en, "BlendShape size can be reduced by using Sparse Accessor")]
            BLENDSHAPE_USE_SPARSE,

            [LangMsg(Languages.ja, "BlendShapeClipのエクスポートに法線とTangentを含めない。UniVRM-0.53 以前ではロードがエラーになるのに注意してください")]
            [LangMsg(Languages.en, "BlendShape's Normal and Tangent will not be exported. Be aware that errors may occur during import if the model is made by UniVRM-0.53 or earlier versions")]
            BLENDSHAPE_EXCLUDE_NORMAL_AND_TANGENT,

            [LangMsg(Languages.ja, "BlendShapeClipから参照されないBlendShapeをエクスポートに含めない")]
            [LangMsg(Languages.en, "BlendShapes that are not referenced by BlendShapeClips will not be exported")]
            BLENDSHAPE_ONLY_CLIP_USE,

            [LangMsg(Languages.ja, "BlendShapeClip.Preset == Unknown のBlendShapeClipをエクスポートに含めない")]
            [LangMsg(Languages.en, "BlendShapeClip will not be exported if BlendShapeClip.Preset == Unknown")]
            BLENDSHAPE_EXCLUDE_UNKNOWN,

            [LangMsg(Languages.ja, "エクスポートに頂点カラーを含めない")]
            [LangMsg(Languages.en, "Vertex color will not be exported")]
            REMOVE_VERTEX_COLOR,

            [LangMsg(Languages.ja, "このボタンで自動で T-Pose にできます。手動で T-Pose にしたり、ボタンの後で手直ししてもOKです。")]
            [LangMsg(Languages.en, "T-Pose can be made automatically with this button, or you can make the model as T-Pose manually. Adjusting T-Pose manually after applying this function is also OK")]
            ENALBE_TPOSE_BUTTON,

            [LangMsg(Languages.ja, "このボタンで自動で T-Pose にできます。prefab には実行できません。")]
            [LangMsg(Languages.en, "T-Pose can be made automatically with this button. It cannot be run on prefabs.")]
            DISABLE_TPOSE_BUTTON,

            [LangMsg(Languages.ja, "T-Pose にする")]
            [LangMsg(Languages.en, "Make T-Pose")]
            DO_TPOSE,
        }

        private void OnEnable()
        {
            m_poseFreeze = new CheckBoxProp(serializedObject.FindProperty(nameof(PoseFreeze)), Options.NORMALIZE);
            m_useSparseAccessor = new CheckBoxProp(serializedObject.FindProperty(nameof(UseSparseAccessor)), Options.BLENDSHAPE_USE_SPARSE);
            m_onlyBlendShapePosition = new CheckBoxProp(serializedObject.FindProperty(nameof(OnlyBlendshapePosition)), Options.BLENDSHAPE_EXCLUDE_NORMAL_AND_TANGENT);
            m_reduceBlendShape = new CheckBoxProp(serializedObject.FindProperty(nameof(ReduceBlendshape)), Options.BLENDSHAPE_ONLY_CLIP_USE);
            m_reduceBlendShapeClip = new CheckBoxProp(serializedObject.FindProperty(nameof(ReduceBlendshapeClip)), Options.BLENDSHAPE_EXCLUDE_UNKNOWN);
        }

        public override void OnInspectorGUI()
        {
            GUILayout.Space(20);
            var settings = (VRMExportSettings)target;
            var root = settings.Root;
            var backup = GUI.enabled;
            GUI.enabled = root.scene.IsValid();
            if (GUI.enabled)
            {
                EditorGUILayout.HelpBox(Options.ENALBE_TPOSE_BUTTON.Msg(), MessageType.Info);
            }
            else
            {
                EditorGUILayout.HelpBox(Options.DISABLE_TPOSE_BUTTON.Msg(), MessageType.Warning);
            }
            if (GUILayout.Button(Options.DO_TPOSE.Msg()))
            {
                if (settings.Root)
                {
                    VRMBoneNormalizer.EnforceTPose(settings.Root);
                }
            }
            GUI.enabled = backup;
            GUILayout.Space(20);

            // ToDo: 任意の BlendShapeClip を適用する

            EditorGUIUtility.labelWidth = 160;
            serializedObject.Update();
            m_poseFreeze.Draw();
            m_useSparseAccessor.Draw();
            m_onlyBlendShapePosition.Draw();
            m_reduceBlendShape.Draw();
            m_reduceBlendShapeClip.Draw();
            serializedObject.ApplyModifiedProperties();
        }
    }
}