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

public class ChatContex : MonoBehaviour
{

    public Text _ContexText;
    public bool _IsShowBlackColor = true;
    public bool _CanShowAllChars = true;

    #region link base

    protected string _ModifiedStr;
    protected bool _HasInitLink = false;

    void Update()
    {
        if (_HasInitLink)
            return;

        if (_ContexText == null || string.IsNullOrEmpty(_ContexText.text))
            return;

        if (_CanShowAllChars && _ContexText.cachedTextGenerator.characterCountVisible == _ContexText.text.Length)
        {
            SetLinksAfterLayout();
            _HasInitLink = true;
        }
        else if (!_CanShowAllChars && _ContexText.cachedTextGenerator.characterCountVisible > 0)
        {
            SetLinksAfterLayout();
            _HasInitLink = true;
        }
    }

    public void OnDisable()
    {
        _HasInitLink = false;
        ClearAllLinks();
    }

    public void ShowLinkStr(string linkStr)
    {

        _ModifiedStr = linkStr;
        _HasInitLink = false;
        ClearAllLinks();

        GetAllChatLinks();
        _ModifiedStr = GetLinkedStr();

        _ContexText.text = _ModifiedStr;
        _ContexText.CalculateLayoutInputHorizontal();
        _ContexText.CalculateLayoutInputVertical();
        
    }


    protected List<ChatLinkBase> _LinkLists = new List<ChatLinkBase>();

    protected void ClearAllLinks()
    {
        foreach (var link in _LinkLists)
        {
            link.ClearLink();
        }
        _LinkLists.Clear();
    }


    protected void GetAllChatLinks()
    {
        int checkPos = _ModifiedStr.IndexOf(ChatLinkBase.StrSendStart);
        int checkEndPos = -1;
        string checkStr = "";
        while (checkPos >= 0)
        {
            checkEndPos = _ModifiedStr.IndexOf(ChatLinkBase.StrSendEnd, checkPos);
            if (checkEndPos < 0)
                break;

            checkStr = _ModifiedStr.Substring(checkPos, checkEndPos - checkPos);
            if (!string.IsNullOrEmpty(checkStr))
            {
                var chatLink = ChatLinkBase.CreateChatLinkBySendStr(_ContexText, null, checkStr, _IsShowBlackColor);
                chatLink.StartPosInText = checkPos;
                chatLink.EndPosInText = checkEndPos;
                _LinkLists.Add(chatLink);
            }

            checkPos = _ModifiedStr.IndexOf(ChatLinkBase.StrSendStart, checkEndPos);
        }
    }

    protected string GetLinkedStr()
    {
        int subStrStart = 0;
        int subStrEnd = 0;
        int newInputEnd = 0;
        string newInputText = "";
        for (int i = 0; i < _LinkLists.Count; ++i)
        {
            if (i > 0)
            {
                subStrStart = _LinkLists[i - 1].EndPosInText + 1;
            }
            subStrEnd = _LinkLists[i].StartPosInText;

            if (subStrEnd > subStrStart)
            {
                newInputText += _ModifiedStr.Substring(subStrStart, subStrEnd - subStrStart);
            }
            _LinkLists[i].StartPosInShowText = newInputText.Length;
            newInputText += _LinkLists[i].StrShow;
            newInputEnd = _LinkLists[i].EndPosInText + 1;
            _LinkLists[i].EndPosInShowText = newInputText.Length;
        }
        newInputText += _ModifiedStr.Substring(newInputEnd, _ModifiedStr.Length - newInputEnd);

        return newInputText;
    }

    protected void SetLinksAfterLayout()
    {
        foreach (var link in _LinkLists)
        {
            link.SetLinkAfterLayout(_ContexText);
        }
    }
    #endregion
}