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

namespace Pinwheel.Griffin.SplineTool
{
    [CustomEditor(typeof(GObjectSpawner))]
    public class GObjectSpawnerInspector : Editor
    {
        private GObjectSpawner instance;
        private Dictionary<GStylizedTerrain, RenderTexture> previewTextures;
        private MaterialPropertyBlock previewPropertyBlock;

        private void OnEnable()
        {
            instance = target as GObjectSpawner;
            instance.Internal_UpdateFalloffTexture();
            previewPropertyBlock = new MaterialPropertyBlock();

            GCommon.RegisterBeginRender(OnCameraRender);
            GCommon.RegisterBeginRenderSRP(OnCameraRenderSRP);
        }

        private void OnDisable()
        {
            GCommon.UnregisterBeginRender(OnCameraRender);
            GCommon.UnregisterBeginRenderSRP(OnCameraRenderSRP);

            if (previewTextures != null)
            {
                foreach (GStylizedTerrain t in previewTextures.Keys)
                {
                    RenderTexture rt = previewTextures[t];
                    if (rt == null)
                        continue;
                    rt.Release();
                    Object.DestroyImmediate(rt);
                }
            }
        }

        public override void OnInspectorGUI()
        {
            instance.SplineCreator = EditorGUILayout.ObjectField("Spline Creator", instance.SplineCreator, typeof(GSplineCreator), true) as GSplineCreator;
            if (instance.SplineCreator == null)
                return;
            bool wideMode = EditorGUIUtility.wideMode;
            EditorGUIUtility.wideMode = true;
            EditorGUI.BeginChangeCheck();
            instance.Falloff = EditorGUILayout.CurveField("Falloff", instance.Falloff, Color.red, new Rect(0, 0, 1, 1));
            if (EditorGUI.EndChangeCheck())
            {
                instance.Internal_UpdateFalloffTexture();
            }
            instance.FalloffNoise = GEditorCommon.InlineTexture2DField("Falloff Noise", instance.FalloffNoise);
            if (instance.FalloffNoise != null)
                instance.FalloffNoiseSize = EditorGUILayout.Vector2Field("Falloff Noise Size", instance.FalloffNoiseSize);

            instance.MaskResolution = EditorGUILayout.DelayedIntField("Mask Resolution", instance.MaskResolution);

            DrawObjectSelectorGUI();

            instance.Density = EditorGUILayout.IntField("Density", instance.Density);
            instance.MinRotation = EditorGUILayout.FloatField("Min Rotation", instance.MinRotation);
            instance.MaxRotation = EditorGUILayout.FloatField("Max Rotation", instance.MaxRotation);
            instance.MinScale = GEditorCommon.InlineVector3Field("Min Scale", instance.MinScale);
            instance.MaxScale = GEditorCommon.InlineVector3Field("Max Scale", instance.MaxScale);
            instance.AlignToSurface = EditorGUILayout.Toggle("Align To Surface", instance.AlignToSurface);
            instance.Editor_ShowLivePreview = EditorGUILayout.Toggle("Live Preview", instance.Editor_ShowLivePreview);
            EditorGUIUtility.wideMode = wideMode;

            EditorGUILayout.Space();
            if (GUILayout.Button("Apply"))
            {
                GAnalytics.Record(GAnalytics.SPLINE_OBJECT_SPAWNER);
                Apply();
            }
        }

        private void DrawObjectSelectorGUI()
        {
            if (instance.Prototypes.Count > 0)
            {
                GSelectionGridArgs args = new GSelectionGridArgs();
                args.collection = instance.Prototypes;
                args.selectedIndices = instance.PrototypeIndices;
                args.itemSize = GEditorCommon.selectionGridTileSizeSmall;
                args.itemPerRow = 4;
                args.drawPreviewFunction = GEditorCommon.DrawGameObjectPreview;
                args.contextClickFunction = OnObjectSelectorContextClick;
                instance.PrototypeIndices = GEditorCommon.MultiSelectionGrid(args);
            }
            else
            {
                EditorGUILayout.LabelField("No Game Object found!", GEditorCommon.WordWrapItalicLabel);
            }
            GEditorCommon.Separator();

            Rect r1 = EditorGUILayout.GetControlRect(GUILayout.Height(GEditorCommon.objectSelectorDragDropHeight));
            GameObject prefab = GEditorCommon.ObjectSelectorDragDrop<GameObject>(r1, "Drop a Game Object here!", "t:GameObject");
            if (prefab != null)
            {
                instance.Prototypes.AddIfNotContains(prefab);
            }

            GEditorCommon.SpacePixel(0);
            Rect r2 = EditorGUILayout.GetControlRect(GUILayout.Height(GEditorCommon.objectSelectorDragDropHeight));
            GPrefabPrototypeGroup group = GEditorCommon.ObjectSelectorDragDrop<GPrefabPrototypeGroup>(r2, "Drop a Prefab Prototype Group here!", "t:GPrefabPrototypeGroup");
            if (group != null)
            {
                instance.Prototypes.AddIfNotContains(group.Prototypes);
            }
        }

        private void OnObjectSelectorContextClick(Rect r, int index, ICollection collection)
        {
            GenericMenu menu = new GenericMenu();
            menu.AddItem(
                new GUIContent("Remove"),
                false,
                () =>
                {
                    instance.Prototypes.RemoveAt(index);
                });

            menu.ShowAsContext();
        }

        private void Apply()
        {
            EditorUtility.DisplayProgressBar("Applying", "Spawning objects...", 1f);
            try
            {
                instance.Apply();
            }
            catch (System.Exception e)
            {
                Debug.LogError(e.ToString());
            }
            EditorUtility.ClearProgressBar();
        }

        private void OnCameraRender(Camera cam)
        {
            if (instance.Editor_ShowLivePreview)
                DrawLivePreview(cam);
        }

        private void OnCameraRenderSRP(UnityEngine.Rendering.ScriptableRenderContext context, Camera cam)
        {
            OnCameraRender(cam);
        }

        private void DrawLivePreview(Camera cam)
        {
            IEnumerator<GStylizedTerrain> terrains = GStylizedTerrain.ActiveTerrains.GetEnumerator();
            while (terrains.MoveNext())
            {
                GStylizedTerrain t = terrains.Current;
                if (t.TerrainData == null)
                    continue;
                if (instance.SplineCreator.GroupId >= 0 &&
                    instance.SplineCreator.GroupId != t.GroupId)
                    continue;
                DrawLivePreview(t, cam);
            }
        }

        private void DrawLivePreview(GStylizedTerrain t, Camera cam)
        {
            if (t.transform.rotation != Quaternion.identity ||
                t.transform.lossyScale != Vector3.one)
                return;

            List<Rect> dirtyRects = new List<Rect>(instance.SplineCreator.SweepDirtyRect(t));
            Rect r = new Rect(0, 0, 0, 0);
            for (int i = 0; i < dirtyRects.Count; ++i)
            {
                r.xMin = Mathf.Min(r.xMin, dirtyRects[i].xMin);
                r.xMax = Mathf.Max(r.xMax, dirtyRects[i].xMax);
                r.yMin = Mathf.Min(r.yMin, dirtyRects[i].yMin);
                r.yMax = Mathf.Max(r.yMax, dirtyRects[i].yMax);
            }

            RenderTexture rt = GetPreviewTexture(t);
            instance.Internal_Apply(t, rt, instance.SplineCreator.Editor_Vertices);
            GLivePreviewDrawer.DrawMasksLivePreview(
                t, cam,
                new Texture[] { rt },
                new Color[] { GEditorSettings.Instance.splineTools.positiveHighlightColor },
                r);
        }

        private RenderTexture GetPreviewTexture(GStylizedTerrain t)
        {
            if (previewTextures == null)
            {
                previewTextures = new Dictionary<GStylizedTerrain, RenderTexture>();
            }

            int resolution = instance.MaskResolution;
            if (!previewTextures.ContainsKey(t) ||
                previewTextures[t] == null)
            {
                RenderTexture rt = new RenderTexture(resolution, resolution, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
                previewTextures[t] = rt;
            }
            else if (previewTextures[t].width != resolution || previewTextures[t].height != resolution)
            {
                previewTextures[t].Release();
                Object.DestroyImmediate(previewTextures[t]);
                RenderTexture rt = new RenderTexture(resolution, resolution, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
                previewTextures[t] = rt;
            }

            previewTextures[t].wrapMode = TextureWrapMode.Clamp;
            return previewTextures[t];
        }
    }
}