// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.

using System;
using System.Collections.Generic;
using FlaxEditor.Content;
using FlaxEditor.CustomEditors;
using FlaxEditor.Scripting;
using FlaxEditor.Surface;
using FlaxEditor.Viewport.Previews;
using FlaxEngine;

// ReSharper disable UnusedMember.Local
// ReSharper disable UnusedMember.Global
// ReSharper disable MemberCanBePrivate.Local

namespace FlaxEditor.Windows.Assets
{
    /// <summary>
    /// Particle Emitter window allows to view and edit <see cref="ParticleEmitter"/> asset.
    /// </summary>
    /// <seealso cref="ParticleEmitter" />
    /// <seealso cref="ParticleEmitterSurface" />
    /// <seealso cref="ParticleEmitterPreview" />
    public sealed class ParticleEmitterWindow : VisjectSurfaceWindow<ParticleEmitter, ParticleEmitterSurface, ParticleEmitterPreview>
    {
        private readonly ScriptType[] _newParameterTypes =
        {
            new ScriptType(typeof(float)),
            new ScriptType(typeof(Texture)),
            new ScriptType(typeof(CubeTexture)),
            new ScriptType(typeof(GPUTexture)),
            new ScriptType(typeof(ChannelMask)),
            new ScriptType(typeof(bool)),
            new ScriptType(typeof(int)),
            new ScriptType(typeof(Vector2)),
            new ScriptType(typeof(Vector3)),
            new ScriptType(typeof(Vector4)),
            new ScriptType(typeof(Color)),
            new ScriptType(typeof(Quaternion)),
            new ScriptType(typeof(Transform)),
            new ScriptType(typeof(Matrix)),
        };

        /// <summary>
        /// The properties proxy object.
        /// </summary>
        private sealed class PropertiesProxy
        {
            [EditorOrder(1000), EditorDisplay("Parameters"), CustomEditor(typeof(ParametersEditor)), NoSerialize]
            // ReSharper disable once UnusedAutoPropertyAccessor.Local
            public ParticleEmitterWindow Window { get; set; }

            [HideInEditor, Serialize]
            // ReSharper disable once UnusedMember.Local
            public List<SurfaceParameter> Parameters
            {
                get => Window.Surface.Parameters;
                set => throw new Exception("No setter.");
            }

            /// <summary>
            /// Gathers parameters from the specified ParticleEmitter.
            /// </summary>
            /// <param name="particleEmitterWin">The ParticleEmitter window.</param>
            public void OnLoad(ParticleEmitterWindow particleEmitterWin)
            {
                // Link
                Window = particleEmitterWin;
            }

            /// <summary>
            /// Clears temporary data.
            /// </summary>
            public void OnClean()
            {
                // Unlink
                Window = null;
            }
        }

        /// <summary>
        /// The graph parameters preview proxy object.
        /// </summary>
        private sealed class PreviewProxy
        {
            [EditorDisplay("Parameters"), CustomEditor(typeof(Editor)), NoSerialize]
            // ReSharper disable once UnusedAutoPropertyAccessor.Local
            public ParticleEmitterWindow Window;

            private class Editor : CustomEditor
            {
                public override DisplayStyle Style => DisplayStyle.InlineIntoParent;

                public override void Initialize(LayoutElementsContainer layout)
                {
                    var window = (ParticleEmitterWindow)Values[0];
                    var parameters = window.Preview.PreviewActor.Parameters;
                    var data = SurfaceUtils.InitGraphParameters(parameters);
                    SurfaceUtils.DisplayGraphParameters(layout, data,
                                                        (instance, parameter, tag) => ((ParticleEmitterWindow)instance).Preview.PreviewActor.GetParameterValue(string.Empty, parameter.Name),
                                                        (instance, value, parameter, tag) => ((ParticleEmitterWindow)instance).Preview.PreviewActor.SetParameterValue(string.Empty, parameter.Name, value),
                                                        Values);
                }
            }
        }

        private readonly PropertiesProxy _properties;
        private Tab _previewTab;

        /// <inheritdoc />
        public ParticleEmitterWindow(Editor editor, AssetItem item)
        : base(editor, item, true)
        {
            // Asset preview
            _preview = new ParticleEmitterPreview(true)
            {
                PlaySimulation = true,
                Parent = _split2.Panel1
            };

            // Asset properties proxy
            _properties = new PropertiesProxy();

            // Preview properties editor
            _previewTab = new Tab("Preview");
            _previewTab.Presenter.Select(new PreviewProxy
            {
                Window = this,
            });
            _tabs.AddTab(_previewTab);

            // Surface
            _surface = new ParticleEmitterSurface(this, Save, _undo)
            {
                Parent = _split1.Panel1,
                Enabled = false
            };

            // Toolstrip
            _toolstrip.AddSeparator();
            _toolstrip.AddButton(editor.Icons.Code64, ShowSourceCode).LinkTooltip("Show generated shader source code");
            _toolstrip.AddButton(editor.Icons.Docs64, () => Platform.OpenUrl(Utilities.Constants.DocsUrl + "manual/particles/index.html")).LinkTooltip("See documentation to learn more");
        }

        private void ShowSourceCode()
        {
            var source = Editor.GetShaderSourceCode(_asset);
            Utilities.Utils.ShowSourceCodeWindow(source, "Particle Emitter GPU Simulation Source", RootWindow.Window);
        }

        /// <inheritdoc />
        public override void OnParamRenameUndo()
        {
            base.OnParamRenameUndo();

            _refreshPropertiesOnLoad = true;
        }

        /// <inheritdoc />
        public override void OnParamAddUndo()
        {
            base.OnParamAddUndo();

            _refreshPropertiesOnLoad = true;
        }

        /// <inheritdoc />
        public override void OnParamRemoveUndo()
        {
            base.OnParamRemoveUndo();

            _refreshPropertiesOnLoad = true;
        }

        /// <inheritdoc />
        public override IEnumerable<ScriptType> NewParameterTypes => _newParameterTypes;

        /// <inheritdoc />
        public override void SetParameter(int index, object value)
        {
            try
            {
                Preview.PreviewActor.Parameters[index].Value = value;
            }
            catch
            {
                // Ignored
            }

            base.SetParameter(index, value);
        }

        /// <inheritdoc />
        protected override void UnlinkItem()
        {
            _properties.OnClean();
            _preview.Emitter = null;

            base.UnlinkItem();
        }

        /// <inheritdoc />
        protected override void OnAssetLinked()
        {
            _preview.Emitter = _asset;

            base.OnAssetLinked();
        }

        /// <inheritdoc />
        public override string SurfaceName => "Particle Emitter";

        /// <inheritdoc />
        public override byte[] SurfaceData
        {
            get => _asset.LoadSurface(true);
            set
            {
                if (_asset.SaveSurface(value))
                {
                    _surface.MarkAsEdited();
                    Editor.LogError("Failed to save Particle Emitter surface data");
                }
                _asset.Reload();
                _asset.WaitForLoaded();
                _preview.PreviewActor.ResetSimulation();
                _previewTab.Presenter.BuildLayoutOnUpdate();
            }
        }

        /// <inheritdoc />
        protected override bool LoadSurface()
        {
            // Load surface graph
            if (_surface.Load())
            {
                // Error
                Editor.LogError("Failed to load Particle Emitter surface.");
                return true;
            }

            // Init asset properties and parameters proxy
            _properties.OnLoad(this);
            _previewTab.Presenter.BuildLayoutOnUpdate();

            return false;
        }

        /// <inheritdoc />
        protected override bool SaveSurface()
        {
            _surface.Save();
            return false;
        }

        /// <inheritdoc />
        protected override void OnSurfaceEditingStart()
        {
            _propertiesEditor.Select(_properties);

            base.OnSurfaceEditingStart();
        }

        /// <inheritdoc />
        protected override bool SaveToOriginal()
        {
            // Copy shader cache from the temporary Particle Emitter (will skip compilation on Reload - faster)
            Guid dstId = _item.ID;
            Guid srcId = _asset.ID;
            Editor.Internal_CopyCache(ref dstId, ref srcId);

            return base.SaveToOriginal();
        }
    }
}