using UnityEngine;
using MonsterLove.StateMachine;
using DG.Tweening;

public enum MessageStates
{
    Init,
    Add,
    Show,
    Del
}

public class MessageElement : MonoBehaviour
{
    [SerializeField] TMPro.TextMeshProUGUI messageText;

    public RectTransform RectTransform
    {
        get
        {
            return transform as RectTransform;
        }
    }

    public string Message { get; private set; }

    private float remaining;

    private MessagePanel panel;

    StateMachine<MessageStates> fsm;

    public void Init(MessagePanel panel, string message, float duration)
    {
        this.panel = panel;

        Message = message;
        remaining = duration;

        if (remaining < 0)
        {
            remaining = float.MaxValue;
        }

        if (fsm is null)
        {
            fsm = StateMachine<MessageStates>.Initialize(this);
        }
        fsm.ChangeState(MessageStates.Init);
    }

    private void Init_Enter()
    {
        // 这里初始化，包括位置和消息信息
        messageText.text = Message;
        messageText.rectTransform.anchoredPosition = new Vector2(messageText.rectTransform.rect.width, 0);

        fsm.ChangeState(MessageStates.Add);
    }

    private void Add_Enter()
    {
        // 这里播动画
        messageText.rectTransform.DOAnchorPosX(0, 0.2f);

        fsm.ChangeState(MessageStates.Show);
    }

    private void Show_Update()
    {
        remaining -= Time.deltaTime;
        if (remaining <= 0)
        {
            remaining = float.MaxValue;
            fsm.ChangeState(MessageStates.Del);
        }
    }

    private void Del_Enter()
    {
        // 理论上这里也需要做个动画，先不管了

        panel.DelMessage(this);
    }

}