import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';

import 'package:chat/chat/keyboard_icon.dart';
import 'package:chat/chat/my_extended_text_selection_controls.dart';
import 'package:chat/chat/record_view.dart';
import 'package:chat/chat/util_keyboard.dart';
import 'package:chat/data/UserData.dart';
import 'package:chat/data/constants.dart';
import 'package:chat/generated/i18n.dart';
import 'package:chat/home/alter_select_view.dart';
import 'package:chat/models/ChatMsg.dart';
import 'package:chat/models/group_info_model.dart';
import 'package:chat/models/keyboard_provider.dart';
import 'package:chat/photo/entity/options.dart';
import 'package:chat/photo/photo.dart';
import 'package:chat/proto/all.pbserver.dart';
import 'package:chat/utils/CustomUI.dart';
import 'package:chat/utils/MessageMgr.dart';
import 'package:chat/utils/group_member_model.dart';
import 'package:chat/utils/image_util.dart';
import 'package:chat/utils/keyboard_utils.dart';
import 'package:chat/utils/msgHandler.dart';
import 'package:chat/utils/screen.dart';
import 'package:chat/utils/sound_util.dart';
import 'package:extended_text_field/extended_text_field.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:oktoast/oktoast.dart';
import 'package:photo_manager/photo_manager.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'emoji_gif_text.dart';
import 'emoji_text.dart';
import 'my_special_text_span_builder.dart';

class InputBar extends StatefulWidget {
  final Function sendMsg;

  InputBar({this.sendMsg});

  @override
  InputBarState createState() => InputBarState();
}

class InputBarState extends State<InputBar>
    with SingleTickerProviderStateMixin {
  final TextEditingController _textCtrl = TextEditingController();
  FocusNode editFocus = NoKeyboardEditableTextFocusNode();
  bool _isComposingMessage = false;

  PageController pageController;

  double keyboardHeight;
  KeyboardBloc _bloc = KeyboardBloc();
  GlobalKey _key = GlobalKey();

  int currentStickersPage = 0;

  //回复相关
  MsgModel refMsg;

  //@成员数组
  List<GroupMemberModel> alterMemberList = [];

  int lastTxtLen = 0;

  @override
  void initState() {
    super.initState();

    print('~~~~~~~~~~inputbar initState~~~~~~~~~~~');
    pageController = new PageController();
    getKeyboardHeight();
    _bloc.start();

    //处理引用事件
    MessageMgr().on('Reply Select Message', replySelectMsg);

    //处理@事件
    MessageMgr().on('Alter User Message', alterOtherMember);
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    editFocus?.requestFocus();
  }

  //获取键盘高度，之前保存的
  getKeyboardHeight() async {
    var sp = await SharedPreferences.getInstance();
    keyboardHeight = sp.getDouble(Constants.KeyboardHeight);

    if (keyboardHeight == null || keyboardHeight < 100) {
      keyboardHeight = 280;
    }
  }

  @override
  void dispose() {
    _key = null;

    _textCtrl.dispose();
    _bloc.dispose();
    editFocus.dispose();
    editFocus = null;
    MessageMgr().off('Reply Select Message', replySelectMsg);
    MessageMgr().off('Alter User Message', alterOtherMember);
    super.dispose();
  }

  //引用某句话
  replySelectMsg(args) async {
    refMsg = args;
    print('处理引用消息');

    setState(() {
      showKeyBoard();
    });
  }

  //快捷@某成员
  alterOtherMember(memberInfo) {
    if (!alterMemberList.contains(memberInfo)) {
      alterMemberList.add(memberInfo);
    }

    print('选中的成员~~~~~~~~~~~~ ${memberInfo.refName}');
    String textStr;
    if (_textCtrl.text.length > 0) {
      textStr = '${_textCtrl.text} @${memberInfo.refName} ';
    } else {
      textStr = '@${memberInfo.refName} ';
    }

    _textCtrl.value = TextEditingValue(
        text: textStr,
        selection:
            TextSelection.fromPosition(TextPosition(offset: textStr.length)));

    setState(() {
      showKeyBoard();
      _isComposingMessage = _textCtrl.text.length > 0;
    });
  }

  //显示键盘
  showKeyBoard() {
    Provider.of<KeyboardIndexProvider>(context, listen: false)
        .changeSelectIndex(0);
    editFocus.requestFocus();
    Provider.of<KeyboardIndexProvider>(context, listen: false)
        .changeReadOnlyKey(false);
    // SystemChannels.textInput.invokeMethod('TextInput.show');
  }

  _getRefShortText() {
    if (refMsg == null) {
      return null;
    }
    String desc = '';

    if (refMsg == null || refMsg.msgType == null) {
      return '';
    }

    switch (ChatType.valueOf(refMsg.msgType)) {
      case ChatType.TextChatType:
        desc = utf8.decode(refMsg.msgContent);
        break;
      case ChatType.EmoticonType:
        desc = '[${I18n.of(context).emoji}]';
        break;
      case ChatType.ImageChatType:
        desc = '[${I18n.of(context).picture}]';
        break;
      case ChatType.ShortVideoChatType:
        desc = '[${I18n.of(context).video}]';
        break;
      case ChatType.PlaceChatType:
        desc = '[${I18n.of(context).locate}]';
        break;
      case ChatType.ShortVoiceChatType:
        desc = '[${I18n.of(context).voice}]';
        break;

      case ChatType.GiftChatType:
        GiftChat giftChat = GiftChat.fromBuffer(refMsg.msgContent);

        if (giftChat.tuId == UserData().basicInfo.userId) {
          desc = I18n.of(context).you_get;
        } else {
          desc = I18n.of(context).you_give;
        }

        break;

      case ChatType.RedWalletChatType:
        desc = '[${I18n.of(context).red_money}]';
        break;

      case ChatType.GroupChatNoticeType:
        desc = '[${I18n.of(context).msg_notice}]';

        break;

      case ChatType.FileChatType:
        desc = '[${I18n.of(context).file}]';

        break;
      default:
    }

    GroupInfoModel groupInfoModel = Provider.of<GroupInfoModel>(context);
    var member = groupInfoModel.getMember(refMsg.from);

    return '${member.refName}: $desc';
  }

  bool isReceiver = false;

  @override
  Widget build(BuildContext context) {
    int curKeyboardIndex =
        Provider.of<KeyboardIndexProvider>(context).curKeyboardIndex;
    bool readOnly =
        Provider.of<KeyboardIndexProvider>(context, listen: false).readOnly;

    bool isGroup = Provider.of<bool>(context);

    Widget centerWidget;
    Widget input = Container(
      child:
      TextField(
//        textSelectionControls: ExtendedMaterialTextSelectionControls(),
        keyboardAppearance: Brightness.light,
        onChanged: (String messageText) {
          if (_textCtrl.text.length > 0) {
            var last = messageText.substring(_textCtrl.text.length - 1);

            if (last == '@' && _textCtrl.text.length > lastTxtLen) {
              editFocus.unfocus();
              _openAlterSelectPage();
            }
          }
          lastTxtLen = _textCtrl.text.length;

          setState(() {
            _isComposingMessage = _textCtrl.text.length > 0;
          });
        },
        key: _key,
        readOnly: readOnly,
        autofocus: true,
        cursorColor: Constants.BlueTextColor,
        style: TextStyle(
            fontSize: ScreenUtil().setSp(16),
            textBaseline: TextBaseline.alphabetic),
        maxLines: 3,
        minLines: 1,
//        specialTextSpanBuilder: MySpecialTextSpanBuilder(
//          showAtBackground: true,
//        ),
        controller: _textCtrl,
        textInputAction: TextInputAction.newline,
        inputFormatters: <TextInputFormatter>[
          LengthLimitingTextInputFormatter(600) //限制长度
        ],
        onSubmitted: _textMessageSubmitted,
        focusNode: editFocus,
        onTap: () {
          showKeyBoard();
          Provider.of<KeyboardIndexProvider>(context, listen: false)
              .changeReadOnlyKey(false);
        },
        decoration: InputDecoration(
          hintText: I18n.of(context).input_content,
          hintStyle: TextStyle(color: const Color(0xffBDBDBD), fontSize: 16),
          border: null,
          hintMaxLines: 1,
          contentPadding: EdgeInsets.only(left: 5, right: 5, top: 8, bottom: 8),
        ),
      ),
    );
    if (refMsg == null) {
      centerWidget = input;
    } else {
      var desc = _getRefShortText();
      centerWidget = Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          Container(
              child: Row(mainAxisSize: MainAxisSize.min, children: [
                Container(
                  child: Text(
                    desc,
                    maxLines: 1,
                    overflow: TextOverflow.ellipsis,
                    textScaleFactor: 1.0,
                  ),
                  constraints: BoxConstraints(maxWidth: Screen.width - 220),
                ),
                InkWell(
                  child: Container(
                    child: Icon(Icons.close, size: 10),
                    padding: EdgeInsets.fromLTRB(10, 5, 5, 5),
                  ),
                  onTap: () {
                    refMsg = null;
                    setState(() {});
                  },
                )
              ]),
              padding: EdgeInsets.symmetric(horizontal: 10, vertical: 2),
              decoration: BoxDecoration(
                  color: Colors.grey[200],
                  border: Border.all(color: Colors.grey),
                  borderRadius: BorderRadius.circular(10))),
          input
        ],
      );
    }
    return GestureDetector(
      onTap: () {
        print('放置触控隐藏键盘');
      },
      child: Container(
          width: Screen.width,
          color: Colors.white,
          child: Column(
            children: <Widget>[
              Container(
                padding: EdgeInsets.symmetric(horizontal: 7, vertical: 7),
                alignment: Alignment.topCenter,
                decoration: BoxDecoration(
                    color: Colors.white,
                    border: Border(top: BorderSide(color: Color(0xFFDFDFDF)))),
                child: Row(
                  children: <Widget>[
                    //emoji图标
                    KeyboardIcon(
                        iconCode: 0xe64d,
                        selectIconCode: 0xe651,
                        isSelect: curKeyboardIndex == 1,
                        size: 27,
                        onTap: () {
                          isReceiver = !isReceiver;
                          SoundUtils.instance.setReceiver(isReceiver);
//
                          if (curKeyboardIndex == 1) {
                            Provider.of<KeyboardIndexProvider>(context,
                                    listen: false)
                                .changeReadOnlyKey(false);
                            showKeyBoard();
                          } else {
                            Provider.of<KeyboardIndexProvider>(context,
                                    listen: false)
                                .changeSelectIndex(1);

                            currentStickersPage = 0;
                          }
                        }),

                    SizedBox(width: 10),

                    //输入框
                    Expanded(child: centerWidget), SizedBox(width: 10),
                    _isComposingMessage
                        ? InkWell(
                            child: Padding(
                                padding: EdgeInsets.fromLTRB(50, 2, 10, 2),
                                child: Icon(
                                  Icons.send,
                                  color: Color(0xFF087FF3),
                                  size: 28,
                                )),
                            onTap: _sendTextMessage)
                        : Container(
                            child: Row(
                              children: <Widget>[
                                KeyboardIcon(
                                    iconCode: 0xe64b,
                                    isSelect: curKeyboardIndex == 2,
                                    size: 28,
                                    onTap: () {
                                      if (curKeyboardIndex == 2) {
                                        showKeyBoard();
                                      } else {
                                        Provider.of<KeyboardIndexProvider>(
                                                context,
                                                listen: false)
                                            .changeSelectIndex(2);
                                      }
                                    }),
                                SizedBox(width: 10),
                                KeyboardIcon(
                                    iconCode: 0xe64f,
                                    isSelect: curKeyboardIndex == 3,
                                    size: 28,
                                    onTap: () {
                                      if (curKeyboardIndex == 3) {
                                        showKeyBoard();
                                      } else {
                                        Provider.of<KeyboardIndexProvider>(
                                                context,
                                                listen: false)
                                            .changeSelectIndex(3);
                                      }
                                    }),
                                SizedBox(width: 10),
                                KeyboardIcon(
                                    iconCode: 0xe60c,
                                    isSelect: curKeyboardIndex == 4,
                                    size: 26,
                                    onTap: () {
                                      _openPhotoView();
                                    }),
                              ],
                            ),
                          )
                  ],
                ),
              ),
              Divider(height: 1, color: const Color(0xffE0E0E0)),
              StreamBuilder(
                stream: _bloc.stream,
                builder: (BuildContext context, AsyncSnapshot snapshot) {
                  double keyHeight = MediaQuery.of(context).viewInsets.bottom;
                  if (keyHeight > 10) {
                    keyboardHeight = keyHeight;
                    UserData().setKeyboardHeight(keyHeight);
                  }
                  return Container(
                      width: double.infinity,
                      color: Colors.white,
                      height: curKeyboardIndex == -1 || curKeyboardIndex == 4
                          ? 0
                          : keyboardHeight,
                      child: curKeyboardIndex >= 1 && curKeyboardIndex < 4
                          ? IndexedStack(
                              children: <Widget>[
                                Container(
                                    color: Colors.white,
                                    width: double.infinity,
                                    height: double.infinity,
                                    child: InkWell(
                                      onTap: () {},
                                      child: Container(
                                        height: keyboardHeight,
                                        child: Column(
                                          children: <Widget>[
                                            Container(
                                              height: keyboardHeight - 50,
                                              child: PageView.custom(
                                                  controller: pageController,
                                                  onPageChanged: (page) {
                                                    setState(() {
                                                      currentStickersPage =
                                                          page;
                                                    });
                                                  },
                                                  childrenDelegate:
                                                      new SliverChildBuilderDelegate(
                                                    (context, index) {
                                                      return index == 0
                                                          ? buildEmojiGird()
                                                          : buildGifGird();
                                                    },
                                                    childCount: 2,
                                                  )),
                                            ),
                                            Divider(
                                              height: 1,
                                              color: Color(0xffE0E0E0),
                                            ),
                                            Container(
                                              height: 49,
                                              child: Row(
                                                children: <Widget>[
                                                  InkWell(
                                                    child: Container(
                                                      width: 59,
                                                      padding:
                                                          EdgeInsets.all(10),
                                                      color:
                                                          currentStickersPage ==
                                                                  0
                                                              ? const Color(
                                                                  0xFFEDEDED)
                                                              : Colors.white,
                                                      child: Image.asset(
                                                          'assets/images/chat/emoji.png'),
                                                    ),
                                                    onTap: () {
                                                      pageController
                                                          .jumpToPage(0);
                                                    },
                                                  ),
                                                  InkWell(
                                                    child: Container(
                                                      padding:
                                                          EdgeInsets.all(8),
                                                      width: 59,
                                                      color:
                                                          currentStickersPage ==
                                                                  1
                                                              ? const Color(
                                                                  0xFFEDEDED)
                                                              : Colors.white,
                                                      child: Image.asset(
                                                          'assets/images/chat/onion.png'),
                                                    ),
                                                    onTap: () {
                                                      pageController
                                                          .jumpToPage(1);
                                                    },
                                                  )
                                                ],
                                              ),
                                            ),
                                          ],
                                        ),
                                      ),
                                    )),
                                UtilKeyboard(
                                    keyboardHeight: keyboardHeight,
                                    isGroup: isGroup,
                                    sendMsg: widget.sendMsg),
                                RecordView(
                                    keyboardHeight: keyboardHeight,
                                    sendMsg: _sendSoundMsg),
                              ],
                              index: curKeyboardIndex - 1,
                            )
                          : Container());
                },
              )
            ],
          )),
    );
  }

  Widget buildEmojiGird() {
    return Container(
      height: keyboardHeight,
      child: Stack(
        children: <Widget>[
          Padding(
            padding: EdgeInsets.fromLTRB(5, 8, 50, 0),
            child: GridView.builder(
              controller: new ScrollController(keepScrollOffset: false),
              gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                  crossAxisCount: 7, crossAxisSpacing: 0, mainAxisSpacing: 0),
              itemBuilder: (context, index) {
                return GestureDetector(
                  child: Container(
                    padding: EdgeInsets.all(7),
                    child: Image.asset(EmojiUitl
                        .instance.emojiMap[EmojiText.flag + "${index + 1}]"]),
                  ),
                  behavior: HitTestBehavior.translucent,
                  onTap: () {
                    insertText(EmojiText.flag + "${index + 1}]", _textCtrl);

                    setState(() {
                      _isComposingMessage = _textCtrl.text.length > 0;
                    });
                  },
                );
              },
              itemCount: EmojiUitl.instance.emojiMap.length,
              padding: EdgeInsets.all(5.0),
            ),
          ),
          Positioned.fill(
              child: Container(
            padding: EdgeInsets.fromLTRB(0, 0, 0, 14),
            alignment: Alignment(1, 1),
            child: InkWell(
              onTap: () {
                deleteText(_textCtrl);

                setState(() {
                  _isComposingMessage = _textCtrl.text.length > 0;
                });
              },
              child: Container(
                decoration: BoxDecoration(
                    color: Color(0x4d0E0E10),
                    borderRadius: BorderRadius.only(
                        topLeft: Radius.circular(4.0),
                        bottomLeft: Radius.circular(4))),
                width: 37,
                height: 28,
                child: Icon(
                  IconData(
                    0xe679,
                    fontFamily: 'iconfont',
                  ),
                  size: 16,
                  color: Colors.white,
                ),
              ),
            ),
          )),
        ],
      ),
    );
  }

  Widget buildGifGird() {
    return Container(
      padding: EdgeInsets.fromLTRB(8, 6, 8, 0),
      height: keyboardHeight,
      child: GridView.builder(
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 5, crossAxisSpacing: 12.0, mainAxisSpacing: 12.0),
        itemBuilder: (context, index) {
          return GestureDetector(
            child: Image.asset(EmojiGifUitl
                .instance.emojiMap[EmojiGifText.flag + "_${index + 1}>"]),
            behavior: HitTestBehavior.translucent,
            onTap: () {
              _sendMessage(EmojiGifText.flag + "_${index + 1}>", true);
            },
          );
        },
        itemCount: EmojiGifUitl.instance.emojiMap.length,
        padding: EdgeInsets.all(5.0),
      ),
    );
  }

  void _openAlterSelectPage() async {
    bool isGroup = Provider.of<bool>(context);

    if (isGroup) {
      GroupInfoModel groupInfoModel = Provider.of<GroupInfoModel>(context);

      editFocus.unfocus();
      Provider.of<KeyboardIndexProvider>(context, listen: false)
          .changeReadOnlyKey(true);

      GroupMemberModel member =
          await AlterSelectPage.pickAlterUser(context, groupInfoModel);

      if (member != null) {
        print('选中的成员~~~~~~~~~~~~ ${member.refName}');
        _textCtrl.text = '${_textCtrl.text}${member.refName}  ';
        alterMemberList.add(member);
      }

      editFocus.requestFocus();
      Provider.of<KeyboardIndexProvider>(context, listen: false)
          .changeReadOnlyKey(false);
    }
  }

  List<int> getAlterUsers(String messageText) {
    List<String> alterUserList = [];
    RegExp alterStr = RegExp(r'@+(\S+)');
    Iterable<Match> matches = alterStr.allMatches(messageText);
    print('~~~~~~~~~~~~~~${matches.length}~~~~~~~~~~~~~~~');
    for (Match m in matches) {
      print('~~~~~~~~~~~~~~${m.group(1)}~~~~~~~~~~~~~~~');
      alterUserList.add(m.group(1));
    }

    List<int> finalAlterList = [];
    for (var member in alterMemberList) {
      if (alterUserList.contains(member.refName)) {
        finalAlterList.add(member.memberId);
        print('有效成员 ${member.refName}');
      }
    }

    return finalAlterList;
  }

  void _openPhotoView() async {
    // Provider.of<KeyboardIndexProvider>(context, listen: false)
    //     .changeSelectIndex(4);

    var photos = await PhotoPicker.pickAsset(
        context: context,
        themeColor: Color(0xFFF0F0F0),
        textColor: Color(0xFF3F3F3F),
        pickType: PickType.onlyImage);

    if (photos != null && photos.length > 0) {
      for (var i = 0; i < photos.length; i++) {
        AssetEntity photoEntity = photos[i];
        var file = await photoEntity.file;
        _sendPhotoFile(file);
      }
    }

    ///防止再点键盘不谈
  }

  void _sendSoundMsg(String soundPath, int duration) {
    bool isGroup = Provider.of<bool>(context);
    int friendId = 0;
    if (!isGroup) {
      friendId = Provider.of<int>(context);
    }

    print('群聊模式 $isGroup');
    var msg = MsgHandler.createSendMsg(
        ChatType.ShortVoiceChatType, Uint8List(0),
        localFile: soundPath,
        friendId: friendId,
        extra: duration,
        channelType: isGroup ? ChatChannelType.Group : ChatChannelType.Session);
    widget.sendMsg(msg);
  }

  void _sendPhotoFile(File imgFile) async {
    var imgSize = await imgFile.length();

    print('图片大小:${imgSize / 1024}KB');
    var sendImg;

    if (imgSize > 33 * 1024 * 1024) {
      showToast(I18n.of(context).video_more_big);
      return;
    }
    bool isNeedUpload = false;
    if (imgSize > ImgSizeLimit) {
      print('图片大于 $ImgSizeLimit,压缩');
      //发送压缩图 WidgetUtil.getCompressImg(path,quality: 80,percentage: 80);
      sendImg = await WidgetUtil.getCompressImg(imgFile.absolute.path );
      isNeedUpload = true;
    } else {
      sendImg = imgFile.readAsBytesSync();
    }

    var rect = await WidgetUtil.getImageWH(
        image: Image.memory(Uint8List.fromList(sendImg)));
    print('图片大小 Rect : $rect');
    int aspectRatio = rect.width * 100 ~/ rect.height;

    bool isGroup = Provider.of<bool>(context);

    print('群聊输入模式 $isGroup');
    int friendId = 0;
    if (!isGroup) {
      friendId = Provider.of<int>(context);
    }

    var msg = MsgHandler.createSendMsg(ChatType.ImageChatType, sendImg,
        localFile: isNeedUpload ? imgFile.absolute.path : null,
        extra: aspectRatio,
        friendId: friendId,
        channelType: isGroup ? ChatChannelType.Group : ChatChannelType.Session);

    widget.sendMsg(msg);
  }

  Future<Null> _textMessageSubmitted(String text) async {
    if (!checkMessage()) {
      _textCtrl.clear();
      alterMemberList.clear();
      lastTxtLen = 0;
      return;
    }
    _textCtrl.clear();

    _sendMessage(text);
  }

  _sendTextMessage() {
    if (!checkMessage()) {
      return;
    }

    var sendStr = _textCtrl.text;

    _textCtrl.clear();

    _sendMessage(sendStr);
  }

  bool checkMessage() {
    if (_textCtrl.text.length == 0) {
      showToast(I18n.of(context).msg_not);
      return false;
    }
    return true;
  }

  _sendMessage(String messageText, [bool isGift = false]) {
    bool isGroup = Provider.of<bool>(context);

    int friendId = 0;
    List<int> alterUsers;
    if (!isGroup) {
      friendId = Provider.of<int>(context);
    } else {
      if (!isGift) {
        //检查@的人员
        alterUsers = getAlterUsers(messageText);
      }
    }

    MsgModel msg = MsgHandler.createSendMsg(
        isGift ? ChatType.EmoticonType : ChatType.TextChatType, messageText,
        friendId: friendId,
        refMsg: refMsg,
        refShortTxt: _getRefShortText(),
        altUsers: alterUsers,
        channelType: isGroup ? ChatChannelType.Group : ChatChannelType.Session);

    widget.sendMsg(msg);

    if (!isGift) {
      if (refMsg != null) {
        refMsg = null;
      }
      alterMemberList.clear();
      lastTxtLen = 0;
    }

    setState(() {
      _isComposingMessage = _textCtrl.text.length > 0;
    });
  }

  ///emoji插入表情-处理换行
  static void insertText(String text, TextEditingController _textCtrl) {
    var value = _textCtrl.value;
    var start = value.selection.baseOffset;
    var end = value.selection.extentOffset;
    if (value.selection.isValid) {
      String newText = "";
      if (value.selection.isCollapsed) {
        if (end > 0) {
          newText += value.text.substring(0, end);
        }
        newText += text;
        if (value.text.length > end) {
          newText += value.text.substring(end, value.text.length);
        }
      } else {
        newText = value.text.replaceRange(start, end, text);
        end = start;
      }

      _textCtrl.value = value.copyWith(
          text: newText,
          selection: value.selection.copyWith(
              baseOffset: end + text.length, extentOffset: end + text.length));
    } else {
      _textCtrl.value = TextEditingValue(
          text: text,
          selection:
              TextSelection.fromPosition(TextPosition(offset: text.length)));
    }
  }

  static void deleteText(TextEditingController _textController) {
    var value = _textController.value;
    var selection = value.selection;
    var text = value.text;

    String newText = '';
    if (selection.baseOffset != selection.extentOffset) {
      newText = selection.textBefore(text) + selection.textAfter(text);
      _textController.value = TextEditingValue(
          text: newText,
          selection: selection.copyWith(
              baseOffset: selection.baseOffset,
              extentOffset: selection.baseOffset));
    } else {
      int offsetLength = 1;
      String text = _textController.text;
      if (text.substring(text.length - 1, text.length) == ']') {
        ///删除表情
        int end = _textController.text.lastIndexOf('[');
        offsetLength = text.length - end;
      }
      newText = text.substring(0, selection.baseOffset - offsetLength) +
          selection.textAfter(text);
      _textController.value = TextEditingValue(
          text: newText,
          selection: selection.copyWith(
              baseOffset: selection.baseOffset - offsetLength,
              extentOffset: selection.baseOffset - offsetLength));
    }
  }
}