using Godot;

namespace ColdMint.scripts;

public partial class HealthBarUi : HBoxContainer
{
	private int _maxHp;
	private int _currentHp;

	public int CurrentHp
	{
		get => _currentHp;
		set
		{
			if (value == _currentHp)
			{
				return;
			}

			var heartCount = GetChildCount();
			//有几颗心是满的
			var fullHeartCount = value / Config.HeartRepresentsHealthValue;
			for (int i = 0; i < fullHeartCount; i++)
			{
				//把Ui刷满
				var textureRect = GetChild<TextureRect>(i);
				textureRect.Texture = _heartFull;
			}

			//有多少空心
			var emptyHeartCount = heartCount - fullHeartCount;
			//最后那颗剩余多少血
			var leftOverTextureRect = GetChild<TextureRect>(fullHeartCount);
			var leftOver = value % Config.HeartRepresentsHealthValue;
			if (leftOver > 0)
			{
				//占总数的百分比
				var percent = leftOver / (float)Config.HeartRepresentsHealthValue;
				leftOverTextureRect.Texture = GetTexture2DByPercent(percent);
				emptyHeartCount--;
			}

			for (int i = heartCount - emptyHeartCount; i < heartCount; i++)
			{
				var textureRect = GetChild<TextureRect>(i);
				textureRect.Texture = _heartEmpty;
			}

			_currentHp = value;
		}
	}

	public int MaxHp
	{
		get => _maxHp;
		set
		{
			if (value == _maxHp)
			{
				return;
			}

			var heartCount = value / Config.HeartRepresentsHealthValue;
			for (var i = 0; i < heartCount; i++)
			{
				var heart =  CreateTextureRect();
				heart.Texture = _heartFull;
				AddChild(heart);
			}

			//最后那颗剩余多少血
			var leftOver = value % Config.HeartRepresentsHealthValue;
			if (leftOver > 0)
			{
				var lastHeart = CreateTextureRect();
				//占总数的百分比
				var percent = leftOver / (float)Config.HeartRepresentsHealthValue;
				lastHeart.Texture = GetTexture2DByPercent(percent);
				AddChild(lastHeart);
			}

			_maxHp = value;
		}
	}

	private TextureRect CreateTextureRect()
	{
		var textureRect = new TextureRect();
		return textureRect;
	}

	/// <summary>
	/// <para>Get the texture based on percentage</para>
	/// <para>根据百分比获取纹理</para>
	/// </summary>
	/// <param name="percent"></param>
	/// <returns></returns>
	private Texture2D GetTexture2DByPercent(float percent)
	{
		if (percent == 0)
		{
			return _heartEmpty;
		}

		if (percent <= 0.25f)
		{
			return _heartQuarter;
		}
		else if (percent <= 0.5f)
		{
			return _heartHalf;
		}
		else if (percent <= 0.75f)
		{
			return _heartThreeFourths;
		}
		else
		{
			return _heartFull;
		}
	}

	private Texture2D _heartFull;
	private Texture2D _heartEmpty;
	private Texture2D _heartHalf;
	private Texture2D _heartQuarter;
	private Texture2D _heartThreeFourths;

	public override void _Ready()
	{
		base._Ready();
		_heartEmpty = GD.Load<Texture2D>("res://sprites/ui/HeartEmpty.png");
		_heartQuarter = GD.Load<Texture2D>("res://sprites/ui/HeartQuarter.png");
		_heartHalf = GD.Load<Texture2D>("res://sprites/ui/HeartHalf.png");
		_heartThreeFourths = GD.Load<Texture2D>("res://sprites/ui/HeartThreeFourths.png");
		_heartFull = GD.Load<Texture2D>("res://sprites/ui/HeartFull.png");
	}
}