//********************************** Banshee Engine (www.banshee3d.com) **************************************************//
//**************** Copyright (c) 2016 Marko Pintera (marko.pintera@gmail.com). All rights reserved. **********************//
using System.Collections.Generic;
using BansheeEngine;

namespace BansheeEditor
{
    /** @addtogroup Inspectors
     *  @{
     */

    /// <summary>
    /// Renders an inspector for the <see cref="Texture"/> resource.
    /// </summary>
    [CustomInspector(typeof(Texture))]
    internal class TextureInspector : Inspector
    {
        private GUIEnumField formatField = new GUIEnumField(typeof(PixelFormat), new LocEdString("Format"));
        private GUIToggleField generateMipsField = new GUIToggleField(new LocEdString("Generate mipmaps"));
        private GUIIntField maximumMipsField = new GUIIntField(new LocEdString("Maximum mipmap level"));
        private GUIToggleField srgbField = new GUIToggleField(new LocEdString("Gamma space"));
        private GUIToggleField cpuCachedField = new GUIToggleField(new LocEdString("CPU cached"));
        private GUIToggleField isCubemapField = new GUIToggleField(new LocEdString("Cubemap"));
        private GUIEnumField cubemapSourceTypeField = 
            new GUIEnumField(typeof(CubemapSourceType), new LocEdString("Cubemap source"));

        private GUIButton reimportButton = new GUIButton(new LocEdString("Reimport"));

        private TextureImportOptions importOptions;

        /// <inheritdoc/>
        protected internal override void Initialize()
        {
            importOptions = GetImportOptions();

            formatField.OnSelectionChanged += x => importOptions.Format = (PixelFormat)x;
            generateMipsField.OnChanged += x => importOptions.GenerateMipmaps = x;
            maximumMipsField.OnChanged += x => importOptions.MaxMipmapLevel = x;
            srgbField.OnChanged += x => importOptions.IsSRGB = x;
            cpuCachedField.OnChanged += x => importOptions.CPUCached = x;
            isCubemapField.OnChanged += x => importOptions.IsCubemap = x;
            cubemapSourceTypeField.OnSelectionChanged += x => importOptions.CubemapSourceType = (CubemapSourceType)x;
            reimportButton.OnClick += TriggerReimport;

            Layout.AddElement(formatField);
            Layout.AddElement(generateMipsField);
            Layout.AddElement(maximumMipsField);
            Layout.AddElement(srgbField);
            Layout.AddElement(cpuCachedField);
            Layout.AddElement(isCubemapField);
            Layout.AddElement(cubemapSourceTypeField);
            Layout.AddSpace(10);

            GUILayout reimportButtonLayout = Layout.AddLayoutX();
            reimportButtonLayout.AddFlexibleSpace();
            reimportButtonLayout.AddElement(reimportButton);
    }

        /// <inheritdoc/>
        protected internal override InspectableState Refresh()
        {
            TextureImportOptions newImportOptions = GetImportOptions();

            formatField.Value = (ulong)newImportOptions.Format;
            generateMipsField.Value = newImportOptions.GenerateMipmaps;
            maximumMipsField.Value = newImportOptions.MaxMipmapLevel;
            srgbField.Value = newImportOptions.IsSRGB;
            cpuCachedField.Value = newImportOptions.CPUCached;
            isCubemapField.Value = newImportOptions.IsCubemap;
            cubemapSourceTypeField.Value = (ulong) newImportOptions.CubemapSourceType;

            cubemapSourceTypeField.Active = importOptions.IsCubemap;

            importOptions = newImportOptions;

            return InspectableState.NotModified;
        }

        /// <summary>
        /// Retrieves import options for the texture we're currently inspecting.
        /// </summary>
        /// <returns>Texture import options object.</returns>
        private TextureImportOptions GetImportOptions()
        {
            TextureImportOptions output = null;

            LibraryEntry texEntry = ProjectLibrary.GetEntry(InspectedResourcePath);
            if (texEntry != null && texEntry.Type == LibraryEntryType.File)
            {
                FileEntry texFileEntry = (FileEntry)texEntry;
                output = texFileEntry.Options as TextureImportOptions;
            }

            if (output == null)
            {
                if (importOptions == null)
                    output = new TextureImportOptions();
                else
                    output = importOptions;
            }

            return output;
        }

        /// <summary>
        /// Reimports the texture resource according to the currently set import options.
        /// </summary>
        private void TriggerReimport()
        {
            ProjectLibrary.Reimport(InspectedResourcePath, importOptions, true);
        }
    }

    /** @} */
}