using System;
using Godot;

namespace Milimoe.GodotGame;

public partial class AnimatedRichTextLabel : RichTextLabel
{
    [Export]
    public float CharactersPerSecond { get; set; } = 20; // 每秒显示的字符数
    public NovelController NovelController { get; set; } = null; // 是否在小说控制器中

    public bool IsAnimationRunning = false; // 动画是否正在运行

    private string _fullText; // 完整的文本内容
    private float _elapsedTime = 0; // 经过的时间
    private int _visibleCharacters = 0; // 当前显示的字符数
    private Timer _timer;

    public override void _Ready()
    {
        _timer = GetNode<Timer>("Timer");
        _timer.Timeout += OnTimerTimeout;
        _fullText = Text; // 保存完整的文本内容
        Text = ""; // 清空 RichTextLabel 的初始文本
        VisibleCharacters = 0; // 确保初始状态下不显示任何字符
    }

    public void StartAnimation()
    {
        _elapsedTime = 0;
        _visibleCharacters = 0;
        Text = _fullText; // 恢复完整的文本内容
        VisibleCharacters = 0; // 确保从头开始显示
        IsAnimationRunning = true;
        _timer.Start(); // 启动 Timer
    }

    public void SkipAnimation()
    {
        if (IsAnimationRunning)
        {
            VisibleCharacters = _fullText.Length; // 直接显示所有字符
            StopAnimation();
        }
    }

    private void StopAnimation()
    {
        if (IsAnimationRunning)
        {
            _timer.Stop();
            IsAnimationRunning = false;
            NovelController.TextAnimationHasFinished();
        }
    }

    public override void _Process(double delta)
    {
        if (!IsAnimationRunning) return;

        if (_timer.IsStopped()) return;

        _elapsedTime += (float)delta;
        int targetVisibleCharacters = (int)(_elapsedTime * CharactersPerSecond);

        if (targetVisibleCharacters > _visibleCharacters)
        {
            _visibleCharacters = Math.Min(targetVisibleCharacters, _fullText.Length);
            VisibleCharacters = _visibleCharacters;
        }

        if (_visibleCharacters >= _fullText.Length)
        {
            StopAnimation();
        }
    }

    private void OnTimerTimeout()
    {
        // 这里可以添加一些逻辑，例如在动画结束后触发一个信号
        // 或者执行其他操作
    }

    public new void SetText(string text)
    {
        _fullText = text;
        Text = "";
        VisibleCharacters = 0;
        IsAnimationRunning = false;
    }
}