using System.Numerics;
using Robust.Client.AutoGenerated;
using Robust.Client.Graphics;
using Robust.Client.ResourceManagement;
using Robust.Client.UserInterface.Controls;
using Robust.Client.UserInterface.CustomControls;
using Robust.Client.UserInterface.RichText;
using Robust.Client.UserInterface.XAML;
using Robust.Shared.Utility;
using static Content.Shared._White.InteractiveBoard.SharedInteractiveBoardComponent;

namespace Content.Client._White.InteractiveBoard.UI
{
    [GenerateTypedNameReferences]
    public sealed partial class InteractiveBoardWindow : BaseWindow
    {
        private static readonly Color DefaultTextColor = new(255, 255, 255);

        private const int MarginSize = 12;

        private StyleBoxTexture _contentTex = new();

        private float _contentLineScale = 1.0f;

        private DragMode _allowedResizeModes = ~DragMode.None;

        private readonly Type[] _allowedTags = new Type[]
        {
            typeof(BoldItalicTag),
            typeof(BoldTag),
            typeof(BulletTag),
            typeof(ColorTag),
            typeof(HeadingTag),
            typeof(ItalicTag)
        };

        public InteractiveBoardWindow()
        {
            RobustXamlLoader.Load(this);

            CloseButton.OnPressed += _ => Close();
            CopyButton.OnPressed += _ => CopyToClipboard();
        }

        public void InitVisuals(EntityUid entity, InteractiveBoardVisualsComponent visuals)
        {
            var resCache = IoCManager.Resolve<IResourceCache>();

            Background.ModulateSelfOverride = visuals.BackgroundModulate;
            var backgroundImage = resCache.GetResource<TextureResource>(visuals.ImagePath);
            {
                var backgroundImageMode = visuals.BackgroundImageTile ? StyleBoxTexture.StretchMode.Tile : StyleBoxTexture.StretchMode.Stretch;
                var backgroundPatchMargin = visuals.BackgroundPatchMargin;
                Background.PanelOverride = new StyleBoxTexture
                {
                    Texture = backgroundImage,
                    TextureScale = visuals.BackgroundScale,
                    Mode = backgroundImageMode,
                    PatchMarginLeft = backgroundPatchMargin.Left,
                    PatchMarginBottom = backgroundPatchMargin.Bottom,
                    PatchMarginRight = backgroundPatchMargin.Right,
                    PatchMarginTop = backgroundPatchMargin.Top
                };
            }

            if (visuals.HeaderImagePath != null)
            {
                HeaderImage.TexturePath = visuals.HeaderImagePath;
                HeaderImage.MinSize = HeaderImage.TextureNormal?.Size ?? Vector2.Zero;
            }

            HeaderImage.ModulateSelfOverride = visuals.HeaderImageModulate;
            HeaderImage.Margin = new Thickness(visuals.HeaderMargin.Left, visuals.HeaderMargin.Top,
                    visuals.HeaderMargin.Right, visuals.HeaderMargin.Bottom);

            Content.ModulateSelfOverride = visuals.ContentImageModulate;
            WrittenTextLabel.ModulateSelfOverride = visuals.FontAccentColor;

            var contentImage = visuals.ContentImagePath != null ? resCache.GetResource<TextureResource>(visuals.ContentImagePath) : null;
            if (contentImage != null)
            {
                _contentTex = new StyleBoxTexture
                {
                    Texture = contentImage,
                    Mode = StyleBoxTexture.StretchMode.Tile,
                };
                Content.PanelOverride = _contentTex;
                _contentLineScale = visuals.ContentImageNumLines;
            }

            Content.Margin = new Thickness(
                    visuals.ContentMargin.Left, visuals.ContentMargin.Top,
                    visuals.ContentMargin.Right, visuals.ContentMargin.Bottom);

            if (visuals.MaxWritableArea != null)
            {
                var a = (Vector2)visuals.MaxWritableArea;
                ScrollingContents.MinSize = Vector2.Zero;
                ScrollingContents.MinSize = a;

                if (a.X > 0.0f)
                {
                    ScrollingContents.MaxWidth = a.X;
                    _allowedResizeModes &= ~(DragMode.Left | DragMode.Right);
                    SetWidth = float.NaN;
                }

                if (a.Y > 0.0f)
                {
                    ScrollingContents.MaxHeight = a.Y;
                    _allowedResizeModes &= ~(DragMode.Top | DragMode.Bottom);
                    SetHeight = float.NaN;
                }
            }
        }

        protected override void Draw(DrawingHandleScreen handle)
        {
            if (WrittenTextLabel.TryGetStyleProperty<Font>("font", out var font))
            {
                float fontLineHeight = font.GetLineHeight(1.0f);
                _contentTex.ExpandMarginTop = font.GetDescent(UIScale);
                var scaleY = _contentLineScale * fontLineHeight / _contentTex.Texture?.Height ?? fontLineHeight;
                _contentTex.TextureScale = new Vector2(1, scaleY);
                {
                    var headerHeight = HeaderImage.Size.Y + HeaderImage.Margin.Top + HeaderImage.Margin.Bottom;
                    var headerInLines = headerHeight / (fontLineHeight * _contentLineScale);
                    var paddingRequiredInLines = (float)Math.Ceiling(headerInLines) - headerInLines;
                    var verticalMargin = fontLineHeight * paddingRequiredInLines * _contentLineScale;
                    TextAlignmentPadding.Margin = new Thickness(0.0f, verticalMargin, 0.0f, 0.0f);
                }
            }

            base.Draw(handle);
        }

        public void Populate(InteractiveBoardBoundUserInterfaceState state)
        {
            var isEditing = state.Mode == InteractiveBoardAction.Write;
            var wasEditing = InputContainer.Visible;
            InputContainer.Visible = isEditing;

            var msg = new FormattedMessage();
            msg.AddMarkupPermissive(state.Text);

            var shouldCopyText = 0 == Input.TextLength && 0 != state.Text.Length;
            if (!wasEditing || shouldCopyText)
            {
                Input.TextRope = Rope.Leaf.Empty;
                Input.CursorPosition = new TextEdit.CursorPos();
                Input.InsertAtCursor(state.Text);
            }

            WrittenTextLabel.SetMessage(msg, _allowedTags, DefaultTextColor);

            WrittenTextLabel.Visible = !isEditing && state.Text.Length > 0;
            BlankIndicator.Visible = !isEditing && state.Text.Length == 0;
        }

        protected override DragMode GetDragModeFor(Vector2 relativeMousePos)
        {
            var mode = DragMode.None;

            if (relativeMousePos.Y < MarginSize)
            {
                mode |= DragMode.Top;
            }
            else if (relativeMousePos.Y > Size.Y - MarginSize)
            {
                mode |= DragMode.Bottom;
            }

            if (relativeMousePos.X < MarginSize)
            {
                mode |= DragMode.Left;
            }
            else if (relativeMousePos.X > Size.X - MarginSize)
            {
                mode |= DragMode.Right;
            }

            if((mode & _allowedResizeModes) == DragMode.None)
            {
                return DragMode.Move;
            }
            return mode & _allowedResizeModes;
        }

        private void CopyToClipboard()
        {
            if (WrittenTextLabel.GetMessage() == null)
                return;

            if (InputContainer.Visible)
            {
                InputContainer.Visible = false;
                Input.Editable = true;
                WrittenTextLabel.Visible = true;
                return;
            }

            InputContainer.Visible = true;
            Input.Editable = false;
            WrittenTextLabel.Visible = false;
        }
    }
}