using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class CentreNoticeLogic : MonoBehaviour
{
    private readonly float[] m_fNewsTime = new float[3];
    private readonly List<int> m_indexs = new List<int>();

    public Text[] m_News;
    public GameObject[] m_NewsObject;

    public Image[] m_NoticeBG;
    private readonly int m_nTimeMax = 3;

    private readonly Transform[] m_ObjTransform = new Transform[3]; //缓存Transform，提高运行效率,必须在Awake的时候就进行赋值
    private GameObject _skillWarning;
    private Text _skillWarningText;
    private SkillWarningData _skillWarningData;
    // 区分技能警告和普通警告 - 技能警告应该处于固定位置，不收到其他提示挤压
    private static CentreNoticeLogic _instance;

    private void Awake()
    {
        _skillWarning = transform.Find("SkillWarning").gameObject;
        _skillWarningText = _skillWarning.GetComponentInChildren<Text>();
        _instance = this;
    }

    private void OnDestroy()
    {
        if (_instance == this)
            _instance = null;
    }
    
    // Use this for initialization
    private void Start()
    {
        _skillWarning.gameObject.SetActive(false);
        for (var i = 0; i < m_NewsObject.Length; i++)
        {
            m_NewsObject[i].SetActive(false);
            m_ObjTransform[i] = m_NewsObject[i].transform;
            m_fNewsTime[i] = Time.realtimeSinceStartup;
            m_indexs.Add(i);
        }
        //InvokeRepeating("DoSomeThing", 0, 0.2f);
    }
    
    // Update is called once per frame
    private void Update()
    {
        var curData = GUIData.GetNotifyData();
        if (null != curData)
            AddNotice(curData);
        for (var i = 0; i < m_NewsObject.Length; i++)
            if (m_NewsObject[i].activeSelf)
                if (Time.realtimeSinceStartup - m_fNewsTime[i] > m_nTimeMax)
                {
                    m_fNewsTime[i] = Time.realtimeSinceStartup;
                    m_NewsObject[i].SetActive(false);
                }
        if (_skillWarningData != null)
        {
            if (!_skillWarningData.isActive)
            {
                if (Time.time > _skillWarningData.startTime)
                {
                    _skillWarningData.isActive = true;
                    _skillWarningText.text = _skillWarningData.content;
                    _skillWarning.SetActive(true);
                }
            }
            else if (Time.time > _skillWarningData.endTime || LoadingWindow._IsLoadingScene)
                    HideSkillWarning();
        }
    }

    private void AddNotice(string notice)
    {
        var index = m_indexs[0];
        m_News[index].text = notice;
        m_NewsObject[index].SetActive(true);
        m_fNewsTime[index] = Time.realtimeSinceStartup;
        m_NoticeBG[index].rectTransform.sizeDelta =
            new Vector3(m_News[index].preferredWidth + 100, m_News[index].preferredHeight + 8, 0);

        m_indexs.Add(index);
        m_indexs.RemoveAt(0);
        for (var i = 0; i < m_indexs.Count; i++)
        {
            var pos = m_ObjTransform[m_indexs[i]].localPosition;
            pos.y = 0 - 35 * i;
            m_ObjTransform[m_indexs[i]].localPosition = pos;
        }
    }

    public static void ShowSkillWarning(string content, float startInterval, float duration)
    {
        if (_instance != null)
        {
            // 移除上一次的技能预警
            _instance.HideSkillWarning();
            var startTime = Time.time + startInterval;
            var endTime = startTime + duration;
            _instance._skillWarningData = new SkillWarningData(content, startTime, endTime);
        }
    }

    public void HideSkillWarning()
    {
        _skillWarningData = null;
        _skillWarning.SetActive(false);
    }

    private class SkillWarningData
    {
        public readonly string content;
        public readonly float startTime;
        public readonly float endTime;
        public bool isActive;

        public SkillWarningData(string content, float startTime, float endTime)
        {
            this.content = content;
            this.startTime = startTime;
            this.endTime = endTime;
        }
    }
}