using System.Collections.Generic;
using System.IO;

using UnityEditor;
using UnityEngine;

using Codice.LogWrapper;
using Unity.PlasticSCM.Editor.AssetUtils;

namespace Unity.PlasticSCM.Editor.UI
{
    internal class Images
    {
        internal enum Name
        {
            None,
            IconPlastic,
            IconCloseButton,
            IconPressedCloseButton,
            IconAddedLocal,
            IconAddedOverlay,
            IconPrivateOverlay,
            IconCheckedOutLocalOverlay,
            IconDeleted,
            IconDeletedLocalOverlay,
            IconDeletedRemote,
            IconDeletedRemoteOverlay,
            IconOutOfSync,
            IconOutOfSyncOverlay,
            IconMoved,
            IconMergeLink,
            Ignored,
            IgnoredOverlay,
            IconConflicted,
            IconConflictedOverlay,
            IconConflictResolvedOverlay,
            IconLockedLocalOverlay,
            IconLockedRemoteOverlay,
            IconRetainedOverlay,
            XLink,
            Ok,
            SecondaryTabClose,
            SecondaryTabCloseHover,
            NotOnDisk,
            IconRepository,
            IconPlasticView,
            IconPlasticNotifyIncoming,
            IconPlasticNotifyConflict,
            Loading,
            IconEmptyGravatar,
            Step1,
            Step2,
            Step3,
            StepOk,
            ButtonSsoSignInUnity,
            ButtonSsoSignInEmail,
            ButtonSsoSignInGoogle,
            IconBranch,
            IconUndo,
            Refresh,
            IconInviteUsers
        }

        internal static Texture2D GetImage(Name image)
        {
            return LoadImage(image, false);
        }

        internal static Texture GetFileIcon(string path)
        {
            string relativePath = GetRelativePath.ToApplication(path);

            return GetFileIconFromRelativePath(relativePath);
        }

        internal static Texture GetFileIconFromCmPath(string path)
        {
            return GetFileIconFromRelativePath(
                path.Substring(1).Replace("/",
                Path.DirectorySeparatorChar.ToString()));
        }

        internal static Texture GetDropDownIcon()
        {
            return GetIconFromEditorGUI("icon dropdown");
        }

        internal static Texture GetDirectoryIcon()
        {
            return GetIconFromEditorGUI("Folder Icon");
        }

        internal static Texture GetPrivatedOverlayIcon()
        {
            if (mPrivatedOverlayIcon == null)
                mPrivatedOverlayIcon = GetOverlay(Name.IconPrivateOverlay);

            return mPrivatedOverlayIcon;
        }

        internal static Texture GetAddedOverlayIcon()
        {
            if (mAddedOverlayIcon == null)
                mAddedOverlayIcon = GetOverlay(Name.IconAddedOverlay);

            return mAddedOverlayIcon;
        }

        internal static Texture GetDeletedLocalOverlayIcon()
        {
            if (mDeletedLocalOverlayIcon == null)
                mDeletedLocalOverlayIcon = GetOverlay(Name.IconDeletedLocalOverlay);

            return mDeletedLocalOverlayIcon;
        }

        internal static Texture GetDeletedRemoteOverlayIcon()
        {
            if (mDeletedRemoteOverlayIcon == null)
                mDeletedRemoteOverlayIcon = GetOverlay(Name.IconDeletedRemoteOverlay);

            return mDeletedRemoteOverlayIcon;
        }

        internal static Texture GetCheckedOutOverlayIcon()
        {
            if (mCheckedOutOverlayIcon == null)
                mCheckedOutOverlayIcon = GetOverlay(Name.IconCheckedOutLocalOverlay);

            return mCheckedOutOverlayIcon;
        }

        internal static Texture GetOutOfSyncOverlayIcon()
        {
            if (mOutOfSyncOverlayIcon == null)
                mOutOfSyncOverlayIcon = GetOverlay(Name.IconOutOfSyncOverlay);

            return mOutOfSyncOverlayIcon;
        }

        internal static Texture GetConflictedOverlayIcon()
        {
            if (mConflictedOverlayIcon == null)
                mConflictedOverlayIcon = GetOverlay(Name.IconConflictedOverlay);

            return mConflictedOverlayIcon;
        }

        internal static Texture GetConflictResolvedOverlayIcon()
        {
            if (mConflictResolvedOverlayIcon == null)
                mConflictResolvedOverlayIcon = GetOverlay(Name.IconConflictResolvedOverlay);

            return mConflictResolvedOverlayIcon;
        }

        internal static Texture GetLockedLocalOverlayIcon()
        {
            if (mLockedLocalOverlayIcon == null)
                mLockedLocalOverlayIcon = GetOverlay(Name.IconLockedLocalOverlay);

            return mLockedLocalOverlayIcon;
        }

        internal static Texture GetLockedRemoteOverlayIcon()
        {
            if (mLockedRemoteOverlayIcon == null)
                mLockedRemoteOverlayIcon = GetOverlay(Name.IconLockedRemoteOverlay);

            return mLockedRemoteOverlayIcon;
        }

        internal static Texture GetRetainedOverlayIcon()
        {
            if (mRetainedOverlayIcon == null)
                mRetainedOverlayIcon = GetOverlay(Name.IconRetainedOverlay);

            return mRetainedOverlayIcon;
        }

        internal static Texture GetIgnoredOverlayIcon()
        {
            if (mIgnoredverlayIcon == null)
                mIgnoredverlayIcon = GetOverlay(Name.IgnoredOverlay);

            return mIgnoredverlayIcon;
        }

        internal static Texture GetWarnIcon()
        {
            return GetIconFromEditorGUI("console.warnicon.sml");
        }

        internal static Texture GetInfoIcon()
        {
            return GetIconFromEditorGUI("console.infoicon.sml");
        }

        internal static Texture GetErrorDialogIcon()
        {
            return GetIconFromEditorGUI("console.erroricon");
        }

        internal static Texture GetWarnDialogIcon()
        {
            return GetIconFromEditorGUI("console.warnicon");
        }

        internal static Texture GetInfoDialogIcon()
        {
            return GetIconFromEditorGUI("console.infoicon");
        }

        internal static Texture GetRefreshIcon()
        {
            if (mRefreshIcon == null)
                mRefreshIcon = GetImage(Name.Refresh);

            return mRefreshIcon;
        }

        internal static Texture GetSettingsIcon()
        {
            return GetIconFromEditorGUI("settings");
        }

        internal static Texture GetCloseIcon()
        {
            if (mCloseIcon == null)
                mCloseIcon = GetImage(Name.SecondaryTabClose);

            return mCloseIcon;
        }

        internal static Texture GetClickedCloseIcon()
        {
            if (mClickedCloseIcon == null)
                mClickedCloseIcon = GetImage(Name.SecondaryTabCloseHover);

            return mClickedCloseIcon;
        }

        internal static Texture GetHoveredCloseIcon()
        {
            if (mHoveredCloseIcon == null)
                mHoveredCloseIcon = GetImage(Name.SecondaryTabCloseHover);

            return mHoveredCloseIcon;
        }

        internal static Texture2D GetUndoIcon()
        {
            if (mUndoIcon == null)
                mUndoIcon = GetImage(Name.IconUndo);

            return mUndoIcon;
        }

        internal static Texture2D GetPlasticIcon()
        {
            if (mPlasticIcon == null)
                mPlasticIcon = GetImage(Name.IconPlastic);

            return mPlasticIcon;
        }

        internal static Texture2D GetBranchIcon()
        {
            if (mBranchIcon == null)
                mBranchIcon = GetImage(Name.IconBranch);

            return mBranchIcon;
        }

        internal static Texture2D GetConflictedIcon()
        {
            if (mConflictedIcon == null)
                mConflictedIcon = GetImage(Name.IconConflicted);

            return mConflictedIcon;
        }

        internal static Texture2D GetOutOfSyncIcon()
        {
            if (mOutOfSyncIcon == null)
                mOutOfSyncIcon = GetImage(Name.IconOutOfSync);

            return mOutOfSyncIcon;
        }

        internal static Texture2D GetPlasticViewIcon()
        {
            if (mPlasticViewIcon == null)
                mPlasticViewIcon = GetImage(Name.IconPlasticView);

            return mPlasticViewIcon;
        }

        internal static Texture2D GePlasticNotifyIncomingIcon()
        {
            if (mPlasticNotifyIncomingIcon == null)
                mPlasticNotifyIncomingIcon = GetImage(Name.IconPlasticNotifyIncoming);

            return mPlasticNotifyIncomingIcon;
        }

        internal static Texture2D GetPlasticNotifyConflictIcon()
        {
            if (mPlasticNotifyConflictIcon == null)
                mPlasticNotifyConflictIcon = GetImage(Name.IconPlasticNotifyConflict);

            return mPlasticNotifyConflictIcon;
        }

        internal static Texture2D GetEmptyGravatar()
        {
            if (mEmptyGravatarIcon == null)
                mEmptyGravatarIcon = Images.GetImage(Images.Name.IconEmptyGravatar);

            return mEmptyGravatarIcon;
        }

        internal static Texture2D GetStepOkIcon()
        {
            if (mStepOkIcon == null)
                mStepOkIcon = Images.GetImage(Images.Name.StepOk);

            return mStepOkIcon;
        }

        internal static Texture2D GetStep1Icon()
        {
            if (mStep1Icon == null)
                mStep1Icon = Images.GetImage(Images.Name.Step1);

            return mStep1Icon;
        }

        internal static Texture2D GetStep2Icon()
        {
            if (mStep2Icon == null)
                mStep2Icon = Images.GetImage(Images.Name.Step2);

            return mStep2Icon;
        }

        internal static Texture2D GetMergeLinkIcon()
        {
            if (mMergeLinkIcon == null)
                mMergeLinkIcon = Images.GetImage(Images.Name.IconMergeLink);

            return mMergeLinkIcon;
        }

        internal static Texture2D GetAddedLocalIcon()
        {
            if (mAddedLocalIcon == null)
                mAddedLocalIcon = Images.GetImage(Images.Name.IconAddedLocal);

            return mAddedLocalIcon;
        }

        internal static Texture2D GetDeletedRemoteIcon()
        {
            if (mDeletedRemoteIcon == null)
                mDeletedRemoteIcon = Images.GetImage(Images.Name.IconDeletedRemote);

            return mDeletedRemoteIcon;
        }

        internal static Texture2D GetDeletedIcon()
        {
            if (mDeletedIcon == null)
                mDeletedIcon = Images.GetImage(Images.Name.IconDeleted);

            return mDeletedIcon;
        }

        internal static Texture2D GetMovedIcon()
        {
            if (mMovedIcon == null)
                mMovedIcon = Images.GetImage(Images.Name.IconMoved);

            return mMovedIcon;
        }

        internal static Texture2D GetRepositoryIcon()
        {
            if (mRepositoryIcon == null)
                mRepositoryIcon = Images.GetImage(Images.Name.IconRepository);

            return mRepositoryIcon;
        }

        internal static Texture GetFileIcon()
        {
            if (mFileIcon == null)
                mFileIcon = EditorGUIUtility.FindTexture("DefaultAsset Icon");

            if (mFileIcon == null)
                mFileIcon = GetIconFromAssetPreview(typeof(DefaultAsset));

            if (mFileIcon == null)
                mFileIcon = GetEmptyImage();

            return mFileIcon;
        }

        internal static Texture2D GetLinkUnderlineImage()
        {
            if (mLinkUnderlineImage == null)
            {
                mLinkUnderlineImage = new Texture2D(1, 1);
                mLinkUnderlineImage.SetPixel(0, 0, UnityStyles.Colors.Link);
                mLinkUnderlineImage.Apply();
            }

            return mLinkUnderlineImage;
        }
        
        internal static Texture2D GetInviteUsersIcon()
        {
            if (mInviteUsersIcon == null)
                mInviteUsersIcon = GetImage(Name.IconInviteUsers);

            return mInviteUsersIcon;
        }

        internal static Texture2D GetTreeviewBackgroundTexture()
        {
            if (mTreeviewBackgroundTexture == null)
                mTreeviewBackgroundTexture = GetTextureFromColor(UnityStyles.Colors.TreeViewBackground);

            return mTreeviewBackgroundTexture;
        }

        internal static Texture2D GetCommentBackgroundTexture()
        {
            if (mCommentBackground == null)
                mCommentBackground = GetTextureFromColor(UnityStyles.Colors.CommentsBackground);

            return mCommentBackground;
        }

        internal static Texture2D GetColumnsBackgroundTexture()
        {
            if (mColumnsBackgroundTexture == null)
                mColumnsBackgroundTexture = GetTextureFromColor(UnityStyles.Colors.ColumnsBackground);

            return mColumnsBackgroundTexture;
        }

        internal static Texture2D GetNewTextureFromTexture(Texture2D texture)
        {
            Texture2D result = new Texture2D(texture.width, texture.height, TextureFormat.BGRA32, false);

            // To keep images consistent throughout the plugin,
            // manually set the filter mode
            result.filterMode = FilterMode.Bilinear;

            return result;
        }

        internal static Texture2D GetNewTextureFromBytes(int width, int height, byte[] bytes)
        {
            Texture2D result = new Texture2D(width, height, TextureFormat.RGBA32, false);

            result.LoadImage(bytes);

            // To keep images consistent throughout the plugin,
            // manually set the filter mode
            result.filterMode = FilterMode.Bilinear;

            return result;
        }

        static Texture2D GetNewTextureFromFile(string path)
        {
            return GetNewTextureFromBytes(1, 1, File.ReadAllBytes(path));
        }

        static Texture2D GetOverlay(Name image)
        {
            return LoadImage(image, true);
        }

        static Texture2D LoadImage(Name image, bool preferFulResImage)
        {
            string imageFileName = image.ToString().ToLower() + ".png";
            string imageFileName2x = image.ToString().ToLower() + "@2x.png";

            string darkImageFileName = string.Format("d_{0}", imageFileName);
            string darkImageFileName2x = string.Format("d_{0}", imageFileName2x);

            string imageFileRelativePath = GetImageFileRelativePath(imageFileName);
            string imageFileRelativePath2x = GetImageFileRelativePath(imageFileName2x);

            string darkImageFileRelativePath = GetImageFileRelativePath(darkImageFileName);
            string darkImageFileRelativePath2x = GetImageFileRelativePath(darkImageFileName2x);

            Texture2D result = null;

            if (EditorGUIUtility.isProSkin)
                result = TryLoadImage(darkImageFileRelativePath, darkImageFileRelativePath2x, preferFulResImage);

            if (result != null)
                return result;

            result = TryLoadImage(imageFileRelativePath, imageFileRelativePath2x, preferFulResImage);

            if (result != null)
                return result;

            mLog.WarnFormat("Image not found: {0}", imageFileName);
            return GetEmptyImage();
        }

        static Texture2D GetEmptyImage()
        {
            if (mEmptyImage == null)
                mEmptyImage = GetTextureFromColor(Color.clear);

            return mEmptyImage;
        }

        static Texture2D GetTextureFromColor(Color color)
        {
            Texture2D texture = new Texture2D(1, 1);

            texture.SetPixel(0, 0, color);
            texture.Apply();

            return texture;
        }

        static Texture GetFileIconFromRelativePath(string relativePath)
        {
            Texture result = AssetDatabase.GetCachedIcon(relativePath);

            if (result != null)
                return result;

            result = GetFileIconFromKnownExtension(relativePath);

            if (result != null)
                return result;

            return GetFileIcon();
        }

        static Texture GetFileIconFromKnownExtension(string relativePath)
        {
            if (relativePath.EndsWith(UnityConstants.TREEVIEW_META_LABEL))
            {
                relativePath = relativePath.Substring(0,
                    relativePath.Length- UnityConstants.TREEVIEW_META_LABEL.Length);
            }

            string extension = Path.GetExtension(relativePath).ToLower();

            if (extension.Equals(".cs"))
                return GetIconFromEditorGUI("cs Script Icon");

            if (extension.Equals(".png") || extension.Equals(".jpg")
             || extension.Equals(".jpeg") || extension.Equals(".gif")
             || extension.Equals(".tga") || extension.Equals(".bmp")
             || extension.Equals(".tif") || extension.Equals(".tiff"))
                return GetIconFromEditorGUI("d_Texture Icon");

            if (extension.Equals(".mat"))
                return GetIconFromAssetPreview(typeof(UnityEngine.Material));

            if (extension.Equals(".fbx") || extension.Equals(".ma")
             || extension.Equals(".mb") || extension.Equals(".blend")
             || extension.Equals(".max") )
                return GetIconFromAssetPreview(typeof(UnityEngine.GameObject));

            if (extension.Equals(".wav") || extension.Equals(".mp3"))
                return GetIconFromAssetPreview(typeof(UnityEngine.AudioClip));

            if (extension.Equals(".anim"))
                return GetIconFromAssetPreview(typeof(UnityEngine.Animation));

            if (extension.Equals(".animator"))
                return GetIconFromAssetPreview(typeof(UnityEngine.Animator));

            if (extension.Equals(".shader"))
                return GetIconFromEditorGUI("d_Shader Icon");

            if (extension.Equals(".asset") && relativePath.StartsWith("ProjectSettings\\"))
                return GetIconFromEditorGUI("EditorSettings Icon");

            return null;
        }

        static Texture2D GetIconFromEditorGUI(string name)
        {
            Texture2D result;

            if (mImagesFromEditorGUICache.TryGetValue(name, out result))
            {
                if (result != null)
                    return result;
                mImagesFromEditorGUICache.Remove(name);
            }

            result = EditorGUIUtility.IconContent(name).image as Texture2D;

            mImagesFromEditorGUICache.Add(name, result);

            return result;
        }

        static Texture2D GetIconFromAssetPreview(System.Type type)
        {
            Texture2D result;

            if (mImagesFromAssetPreviewCache.TryGetValue(type.ToString(), out result))
            {
                if (result != null)
                    return result;
                mImagesFromAssetPreviewCache.Remove(type.ToString());
            }

            result = AssetPreview.GetMiniTypeThumbnail(type);

            mImagesFromAssetPreviewCache.Add(type.ToString(), result);

            return result;
        }

        static string GetImageFileRelativePath(string imageFileName)
        {
            return Path.Combine(
                AssetsPath.GetImagesFolderRelativePath(),
                imageFileName);
        }

        static Texture2D TryLoadImage(
            string imageFileRelativePath, string image2xFilePath, bool preferFulResImage)
        {
            bool isImageAvailable = File.Exists(Path.GetFullPath(imageFileRelativePath));
            bool isImage2XAvailable = File.Exists(Path.GetFullPath(image2xFilePath));

            if ((EditorGUIUtility.pixelsPerPoint > 1f || !isImageAvailable || preferFulResImage) &&
                isImage2XAvailable)
                return LoadTextureFromFile(image2xFilePath);

            if (isImageAvailable)
                return LoadTextureFromFile(imageFileRelativePath);

            return null;
        }

        static Texture2D LoadTextureFromFile(string path)
        {
            Texture2D result;

            if (mImagesByPathCache.TryGetValue(path, out result))
            {
                if (result != null)
                    return result;
                mImagesByPathCache.Remove(path);
            }

            // Don't use AssetDatabase to load as it will
            // pick filtering mode from the asset itself
            // which leads to inconsistent filtering between
            // images.
            result = GetNewTextureFromFile(path);

            mImagesByPathCache.Add(path, result);

            return result;
        }

        static Dictionary<string, Texture2D> mImagesByPathCache =
            new Dictionary<string, Texture2D>();

        static Dictionary<string, Texture2D> mImagesFromEditorGUICache =
            new Dictionary<string, Texture2D>();

        static Dictionary<string, Texture2D> mImagesFromAssetPreviewCache =
            new Dictionary<string, Texture2D>();

        static Texture mFileIcon;

        static Texture mPrivatedOverlayIcon;
        static Texture mAddedOverlayIcon;
        static Texture mDeletedLocalOverlayIcon;
        static Texture mDeletedRemoteOverlayIcon;
        static Texture mCheckedOutOverlayIcon;
        static Texture mOutOfSyncOverlayIcon;
        static Texture mConflictedOverlayIcon;
        static Texture mConflictResolvedOverlayIcon;
        static Texture mLockedLocalOverlayIcon;
        static Texture mLockedRemoteOverlayIcon;
        static Texture mRetainedOverlayIcon;
        static Texture mIgnoredverlayIcon;

        static Texture mRefreshIcon;

        static Texture mCloseIcon;
        static Texture mClickedCloseIcon;
        static Texture mHoveredCloseIcon;

        static Texture2D mLinkUnderlineImage;

        static Texture2D mEmptyImage;

        static Texture2D mTreeviewBackgroundTexture;
        static Texture2D mColumnsBackgroundTexture;
        static Texture2D mCommentBackground;

        static Texture2D mUndoIcon;
        static Texture2D mPlasticIcon;
        static Texture2D mBranchIcon;
        static Texture2D mConflictedIcon;
        static Texture2D mOutOfSyncIcon;
        static Texture2D mInviteUsersIcon;

        static Texture2D mPlasticViewIcon;
        static Texture2D mPlasticNotifyIncomingIcon;
        static Texture2D mPlasticNotifyConflictIcon;

        static Texture2D mEmptyGravatarIcon;
        static Texture2D mStepOkIcon;
        static Texture2D mStep1Icon;
        static Texture2D mStep2Icon;

        static Texture2D mMergeLinkIcon;
        static Texture2D mAddedLocalIcon;
        static Texture2D mDeletedRemoteIcon;
        static Texture2D mDeletedIcon;
        static Texture2D mMovedIcon;
        static Texture2D mRepositoryIcon;

        static readonly ILog mLog = LogManager.GetLogger("Images");
    }
}