using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using Godot;

namespace KeepersCompound.TMV.UI;

public partial class TextureBrowser : Node
{
	enum SortMode
	{
		Name,
		Family,
		Index,
		Count,
	}

	private Tree _folderTree;
	private LineEdit _searchBar;
	private MenuButton _sortMenu;
	private Button _openFolderButton;
	private MenuButton _browserMenu;
	private HFlowContainer _textureList;
	private TextureRect _previewTexture;
	private LineEdit _texturePath;
	private Button _texturePathCopyButton;
	private OptionButton _filterOptions;
	private LineEdit _fileType;
	private LineEdit _resolutionBox;
	private LineEdit _fileSizeBox;

	private string _searchFilterPrefix = "";

	public override void _Ready()
	{
		// !HACK TEMP
		Context.Instance.PathManager.Init("/stuff/Games/thief/drive_c/GOG Games/TG ND 1.27 (MAPPING)/");
		Context.Instance.SetCampaign("TheBlackParade_1_0");

		_folderTree = GetNode<Tree>("%FolderTree");
		_searchBar = GetNode<LineEdit>("%SearchBar");
		_sortMenu = GetNode<MenuButton>("%SortMenu");
		_openFolderButton = GetNode<Button>("%OpenTextureFolderButton");
		_browserMenu = GetNode<MenuButton>("%BrowserOverflowMenu");
		_textureList = GetNode<HFlowContainer>("%TextureList");
		_previewTexture = GetNode<TextureRect>("%PreviewTexture");
		_texturePath = GetNode<LineEdit>("%PathBox");
		_texturePathCopyButton = GetNode<Button>("%PathCopyButton");
		_filterOptions = GetNode<OptionButton>("%FilterOptions");
		_fileType = GetNode<LineEdit>("%FileTypeBox");
		_resolutionBox = GetNode<LineEdit>("%ResolutionBox");
		_fileSizeBox = GetNode<LineEdit>("%FileSizeBox");

		_searchBar.TextChanged += ApplySearchFilter;
		_sortMenu.GetPopup().IdPressed += ApplySortMode;
		_folderTree.ItemSelected += SetActiveFolder;
		_filterOptions.ItemSelected += SetPreviewTextureFilter;
		_texturePathCopyButton.Pressed += CopyTexturePath;

		BuildFolderTree();
		BuildTextureList(); // TODO: This should be triggered on folder change
	}

	private void CopyTexturePath()
	{
		DisplayServer.ClipboardSet(_texturePath.Text);
	}

	private void BuildFolderTree()
	{
		_folderTree.Clear();

		var campaignResources = Context.Instance.CampaignResources;
		var textureNames = campaignResources.GetResourceNames(LGS.ResourceType.Texture);

		var treeItems = new Dictionary<string, TreeItem>();
		treeItems.Add("", _folderTree.CreateItem());
		foreach (var name in textureNames)
		{
			var tokens = name.Split('/');
			var fams = new string[tokens.Length + 1];
			fams[0] = "";
			for (var i = 1; i < tokens.Length; i++)
			{
				fams[i] = tokens[..i].Join("/");
				if (!treeItems.ContainsKey(fams[i]))
				{
					var item = _folderTree.CreateItem(treeItems[fams[i - 1]]);
					item.SetText(0, tokens[i - 1]);
					treeItems.Add(fams[i], item);
				}
			}
		}
	}

	private void BuildTextureList()
	{
		foreach (var child in _textureList.GetChildren())
		{
			child.QueueFree();
		}

		var campaignResources = Context.Instance.CampaignResources;
		var resType = LGS.ResourceType.Texture;
		var textureNames = campaignResources.GetResourceNames(resType);
		foreach (var name in textureNames)
		{
			var path = campaignResources.GetResourcePath(resType, name);
			var texture = TextureLoader.LoadTexture(path);

			var textureRect = new TextureRect();
			textureRect.Texture = texture;
			textureRect.ExpandMode = TextureRect.ExpandModeEnum.IgnoreSize;
			textureRect.StretchMode = TextureRect.StretchModeEnum.KeepAspectCentered;
			textureRect.SetAnchorsPreset(Control.LayoutPreset.FullRect);

			// We use meta here rather than just Name because Name replaces / with _ so
			// we can't reliably construct it (the path can have natural _)
			var slot = new Panel();
			slot.SetMeta("TexPath", name);
			slot.CustomMinimumSize = new Vector2(128, 128);
			slot.AddChild(textureRect);
			slot.GuiInput += (input) =>
			{
				if (input is InputEventMouseButton mouseEvent &&
					mouseEvent.Pressed &&
					mouseEvent.ButtonIndex == MouseButton.Left)
				{
					SetPreviewTexture(name, texture, path);
				}
			};

			_textureList.AddChild(slot);
		}
	}

	private void SetPreviewTexture(string name, Texture2D texture, string path)
	{
		_previewTexture.Texture = texture;
		_texturePath.Text = name;
		_fileType.Text = Path.GetExtension(path).ToUpper();

		var resolution = texture.GetSize();
		_resolutionBox.Text = $"{resolution.X}x{resolution.Y}";

		var fileInfo = new FileInfo(path);
		_fileSizeBox.Text = $"{(fileInfo.Length / 1000.0f).ToString("0.0")} kb";
	}

	private void ApplySearchFilter(string filter)
	{
		var regex = $"^{_searchFilterPrefix}.*{Regex.Escape(filter).Replace("\\*", ".*")}.*$";
		foreach (var node in _textureList.GetChildren())
		{
			var panel = (Panel)node;
			var name = panel.GetMeta("TexPath").ToString();
			panel.Visible = Regex.IsMatch(name, regex);
		}
	}

	private void ApplySortMode(long id)
	{
		var popup = _sortMenu.GetPopup();
		for (var i = 0; i < popup.ItemCount; i++)
		{
			popup.SetItemChecked(i, popup.GetItemId(i) == id);
		}

		// TODO: Actualy sort
	}

	private void SetActiveFolder()
	{
		var selected = _folderTree.GetSelected();
		var selectedFolder = selected.GetText(0) + "/";
		var parent = selected.GetParent();
		while (parent != null)
		{
			var text = parent.GetText(0);
			if (text != "")
			{
				selectedFolder = text + "/" + selectedFolder;
			}
			parent = parent.GetParent();
		}

		// This prefix is used in a regex, so we escape it here. The additional
		// replace is because C# Regex doesn't escape /
		_searchFilterPrefix = Regex.Escape(selectedFolder).Replace("/", "\\/");
		ApplySearchFilter(_searchBar.Text);
	}

	private void SetPreviewTextureFilter(long idx)
	{
		var filterMode = idx switch
		{
			0 => CanvasItem.TextureFilterEnum.LinearWithMipmaps,
			1 => CanvasItem.TextureFilterEnum.NearestWithMipmaps,
			_ => throw new InvalidOperationException(),
		};
		_previewTexture.TextureFilter = filterMode;
	}
}