using System.Linq;
using System.Threading.Tasks;
using Godot;
using Milimoe.FunGame.Core.Api.Utility;
using Milimoe.FunGame.Core.Model;

namespace Milimoe.GodotGame;

public partial class NovelController : CanvasLayer, ISaveSelectionEvent
{
	public string NovelName { get; set; } = "";
	public string SceneName { get; set; } = "";
	public NovelConfig NovelConfig { get; set; } = null;
	public NovelNode Current { get; set; } = null;
	public INovelEndEvent ChapterObject { get; set; } = null;
	public IMenuObject MenuObject { get; set; } = null;
	public IFadeInFadeOutBlack FadeObject { get; set; } = null;
	public bool Automatic { get; set; } = false;

    [Export]
	public SavedSelection SavedSelection;

	[Signal]
	public delegate void CloseSavedSelectionEventHandler(bool selected, int index);

	private TextureRect _portrait1;
	private TextureRect _portrait2left;
	private TextureRect _portrait2right;
	private TextureRect _image1;
	private TextureRect _image2left;
	private TextureRect _image2right;
	private Panel _panel;
	private Panel _namePanel;
	private Label _name;
	private RichTextLabel _content;
	private AnimatedRichTextLabel _content_richLabel;
	private VBoxContainer _vBoxContainer;
	private ColorRect _colorRect;
	private Button _autoPlay;
	private Button _load;
	private Button _save;
	private Button _menu;

	public override void _Ready()
	{
        Visible = false;
		_portrait1 = GetNode<TextureRect>("立绘1");
		_portrait2left = GetNode<TextureRect>("立绘2左");
		_portrait2right = GetNode<TextureRect>("立绘2右");
		_image1 = _portrait1.GetNode<TextureRect>("Image");
		_image2left = _portrait2left.GetNode<TextureRect>("Image");
		_image2right = _portrait2right.GetNode<TextureRect>("Image");
		_panel = GetNode<Panel>("Panel");
		_namePanel = _panel.GetNode<Panel>("NamePanel");
		_name = _namePanel.GetNode<Label>("Name");
		_content = _panel.GetNode<RichTextLabel>("Content");
		if (_content is AnimatedRichTextLabel richLabel)
		{
			_content_richLabel = richLabel;
			_content_richLabel.NovelController = this;
		}
		_colorRect = GetNode<ColorRect>("透明挡板");
		_vBoxContainer = GetNode<VBoxContainer>("选项框");
		if (_colorRect != null)
		{
			_colorRect.GuiInput += ColorRect_GuiInput;
		}
		_autoPlay = GetNode<Button>("自动播放");
		_load = GetNode<Button>("读取存档");
		_save = GetNode<Button>("保存存档");
		_menu = GetNode<Button>("游戏菜单");
		if (_autoPlay != null)
		{
			_autoPlay.Pressed += () => Automatic = _autoPlay.ButtonPressed;
		}
		if (_load != null)
		{
			_load.Pressed += () => OnLoadSaveButtonPressed(false);
		}
		if (_save != null)
		{
			_save.Pressed += () => OnLoadSaveButtonPressed(true);
		}
		if (_menu != null)
		{
			_menu.Pressed += OnMenuButtonPressed;
		}
	}

	public void InitNovel(string novel_name, string scene_name)
	{
		NovelName = novel_name;
		SceneName = scene_name;
		if (NovelName != "" && SceneName != "")
		{
			NovelConfig ??= NovelConfig.LoadFrom(ProjectSettings.GlobalizePath("res://resources/novels/第一章/场景一.json"), NovelName, false);
			if (NovelConfig.Count > 0)
			{
				ShowNode(NovelConfig.Values.First());
			}
		}
	}

	public void ShowNode(NovelNode node)
	{
		if (node != null)
		{
            GameConstant.NovelName = NovelName;
            GameConstant.SceneName = SceneName;
            GameConstant.NovelNodeKey = node.Key;
            _name.Text = node.Name;
			_namePanel.Visible = _name.Text != "";
			_name.Visible = _name.Text != "";
			if (node.PortraitImagePath != "")
			{
				using Texture2D texture = GD.Load<CompressedTexture2D>(node.PortraitImagePath);
				_image1.Texture = texture;
				_image1.Visible = true;
			}
			else _image1.Visible = false;
			if (_content_richLabel != null)
			{
				_content_richLabel.SetText(node.Content);
				_content_richLabel.StartAnimation();
			}
			else _content.Text = node.Content;
			foreach (Node child in _vBoxContainer.GetChildren())
			{
				child.QueueFree();
			}
			_vBoxContainer.Visible = false;
			_colorRect.Visible = true;
			Current = node;
			Visible = true;
		}
		else Visible = false;
	}

	public async void TextAnimationHasFinished()
	{
		if (Current != null)
		{
			await Task.Delay(500);
			if (_vBoxContainer.Visible)
			{
				return;
			}
			foreach (NovelOption option in Current.AvailableOptions)
			{
				Button button = new()
				{
					Text = option.Name,
					Theme = GD.Load<Theme>("res://resources/themes/option.tres")
				};
				button.Pressed += () => OnOptionButtonClick(option);
				_vBoxContainer.AddChild(button);
			}
			if (Current.AvailableOptions.Count == 0)
			{
				// 透明挡板用于控制在没有选项时继续
				_colorRect.Visible = true;
				// 如果是自动播放剧情，则在800ms后，自动下一句
				if (Automatic)
				{
					await Task.Delay(800);
					// 需要再次判断
					if (Automatic && !_content_richLabel.IsAnimationRunning)
					{
						NovelNode next = Current.Next;
						if (next != null)
						{
							ShowNode(next);
						}
						else
						{
							ChapterObject.OnNovelEnd(this, NovelName, SceneName);
						}
					}
				}
			}
			else
			{
				// 显示选项框
				_vBoxContainer.Visible = true;
			}
		}
	}

	public void OnOptionButtonClick(NovelOption option)
	{
		if (option != null && option.Targets.Count > 0)
		{
			NovelNode next = option.Targets.First();
			ShowNode(next);
		}
	}

	private void ColorRect_GuiInput(InputEvent @event)
	{
		if (@event is InputEventMouseButton mouseButtonEvent)
		{
			if (mouseButtonEvent.ButtonIndex == MouseButton.Left && mouseButtonEvent.Pressed)
			{
				if (_content_richLabel.IsAnimationRunning)
				{
					_content_richLabel.SkipAnimation();
				}
				else
				{
					if (Current.AvailableOptions.Count > 0)
					{
						return;
					}
					NovelNode next = Current.Next;
					if (next != null)
					{
						ShowNode(next);
					}
					else
					{
						ChapterObject.OnNovelEnd(this, NovelName, SceneName);
					}
				}
			}
		}
	}

	private void OnLoadSaveButtonPressed(bool isSave)
	{
		if (isSave)
		{
			// 保存游戏
			GD.Print("Save Game!");
			SavedSelection.SetIsSave(true);
		}
		else
		{
			// 载入游戏
			GD.Print("Load Game!");
			SavedSelection.SetIsSave(false);
		}

		// 使用动画效果显示存档列表
		if (SavedSelection != null)
		{
			SavedSelection.Show();
			SavedSelection.GetNode<ColorRect>("ColorRect").GetNode<AnimationPlayer>("AnimationPlayer").Play("flyin");
		}
	}

    private void OnMenuButtonPressed()
    {
        // 打开游戏菜单
        GD.Print("Open Game Menu!");
        if (MenuObject is IMenuObject obj)
        {
            obj.ChangeState();
        }
    }

    public async void OnSaveSelectionClosed(bool selected, int index, bool isSave)
	{
		if (SavedSelection != null && !SavedSelection.IsClosing)
		{
			// 关闭存档选择界面
			SavedSelection.IsClosing = true;
			SavedSelection.GetNode<ColorRect>("ColorRect").GetNode<AnimationPlayer>("AnimationPlayer").Play("flyout");
			await Task.Delay(300);
			SavedSelection.IsClosing = false;
			SavedSelection.Hide();
			if (selected && index >= 0)
			{
				if (!isSave)
				{
					// 载入游戏
					GD.Print($"Selected Saved: {index}!");
                    if (FadeObject != null)
                    {
                        await FadeObject.FadeInBlack(1f);
                    }
					else await Task.Delay(1000);
					GetTree().Quit();
				}
			}
			else
			{
				GD.Print("Close SavedSelection!");
			}
		}
	}
}