using Editor;
using Editor.Assets;
using Sandbox;
using System;
using System.Collections.Generic;
using System.Linq;
using static Editor.Inspectors.AssetInspector;

namespace SpriteTools;

[CanEdit( "asset:spr" )]
public class SpriteInspector : Widget, IAssetInspector
{
	private SpriteResource Sprite;
	private AssetPreview AssetPreview;

	private readonly ExpandGroup AnimationGroup;
	private readonly AnimationList Animations;

	public SpriteInspector ( Widget parent ) : base( parent )
	{
		Layout = Layout.Column();
		Layout.Margin = 4;
		Layout.Spacing = 4;

		AnimationGroup = new ExpandGroup( this );
		AnimationGroup.StateCookieName = $"{nameof( SpriteInspector )}.{nameof( AnimationGroup )}";
		AnimationGroup.Icon = "directions_run";
		AnimationGroup.Title = $"Animations";
		AnimationGroup.Visible = false;
		Layout.Add( AnimationGroup );

		Animations = new AnimationList( AnimationGroup );
		Animations.ItemSelected = PlayAnimation;
		AnimationGroup.SetWidget( Animations );
	}

	private void PlayAnimation ( string name )
	{
		if ( AssetPreview is null )
			return;

		if ( AssetPreview is PreviewSprite preview )
		{
			preview.SetAnimation( name );
		}
	}

	public void SetAssetPreview ( AssetPreview preview )
	{
		AssetPreview = preview;
	}

	public void SetAsset ( Asset asset )
	{
		Sprite = asset.LoadResource<SpriteResource>();
		if ( Sprite == null ) return;

		if ( Sprite.Animations.Count > 0 )
		{
			AnimationGroup.Visible = true;
			Animations.SetSprite( Sprite );
		}

		AnimationGroup.Update();
	}

	private class AnimationList : ItemList
	{
		public override string ItemName => "Animation";
		public override string ItemIcon => "animgraph_editor/single_frame_icon.png";

		public AnimationList ( Widget parent ) : base( parent )
		{

		}

		public override void SetSprite ( SpriteResource sprite )
		{
			Items = Enumerable.Range( 0, sprite.Animations.Count )
				.Select( x => sprite.Animations[x].Name )
				.OrderBy( x => x )
				.ToList();

			ListView.SetItems( Items );
		}
	}

	private abstract class ItemList : Widget
	{
		protected readonly ListView ListView;
		protected List<string> Items;

		public abstract string ItemName { get; }
		public abstract string ItemIcon { get; }

		public Action<string> ItemSelected { get; set; }

		public abstract void SetSprite ( SpriteResource model );

		public ItemList ( Widget parent ) : base( parent )
		{
			Layout = Layout.Column();
			Layout.Margin = 4;
			Layout.Spacing = 4;

			ListView = new ListView( this )
			{
				ItemSize = new Vector2( 0, 25 ),
				Margin = new( 4, 4, 16, 4 ),
				ItemPaint = PaintAnimationItem,
				ItemContextMenu = ShowItemContext,
				ToggleSelect = true,
				ItemSelected = ( o ) => ItemSelected?.Invoke( o as string ),
				ItemDeselected = ( o ) => ItemSelected?.Invoke( null ),
			};

			var filter = new LineEdit( this )
			{
				PlaceholderText = $"Filter {ItemName}s..",
				FixedHeight = 25
			};

			filter.TextEdited += ( t ) =>
			{
				ListView.SetItems( Items == null || Items.Count == 0 ? null : string.IsNullOrWhiteSpace( t ) ? Items :
					Items.Where( x => x.Contains( t, StringComparison.OrdinalIgnoreCase ) ) );
			};

			Layout.Add( filter );
			Layout.Add( ListView, 1 );
		}

		private void ShowItemContext ( object obj )
		{
			if ( obj is not string name ) return;

			var m = new Menu();

			m.AddOption( "Copy", "content_copy", () =>
			{
				EditorUtility.Clipboard.Copy( name );
			} );

			m.OpenAt( Editor.Application.CursorPosition );
		}

		private void PaintAnimationItem ( VirtualWidget v )
		{
			if ( v.Object is not string name )
				return;

			var rect = v.Rect;

			Paint.Antialiasing = true;

			var fg = Theme.Text.Darken( 0.2f );

			if ( Paint.HasSelected )
			{
				fg = Theme.Text;
				Paint.ClearPen();
				Paint.SetBrush( Theme.Primary.WithAlpha( 0.5f ) );
				Paint.DrawRect( rect, 2 );
				Paint.SetBrush( Theme.Primary.WithAlpha( 0.4f ) );
			}
			else if ( Paint.HasMouseOver )
			{
				Paint.ClearPen();
				Paint.SetBrush( Theme.Primary.WithAlpha( 0.25f ) );
				Paint.DrawRect( rect, 2 );
			}

			var iconRect = rect.Shrink( 8, 4 );
			iconRect.Width = iconRect.Height;
			Paint.Draw( iconRect, ItemIcon );

			var textRect = rect.Shrink( 4 );
			textRect.Left = iconRect.Right + 8;

			Paint.SetDefaultFont();
			Paint.SetPen( fg );
			Paint.DrawText( textRect, $"{name}", TextFlag.LeftCenter );
		}
	}

}