import 'dart:async';
import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:flutter_typeahead/flutter_typeahead.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:get/get.dart';
import 'package:solian/exts.dart';
import 'package:solian/models/account.dart';
import 'package:solian/models/channel.dart';
import 'package:solian/models/event.dart';
import 'package:solian/models/packet.dart';
import 'package:solian/providers/attachment_uploader.dart';
import 'package:solian/providers/auth.dart';
import 'package:solian/providers/stickers.dart';
import 'package:solian/providers/websocket.dart';
import 'package:solian/widgets/account/account_avatar.dart';
import 'package:solian/widgets/attachments/attachment_editor.dart';
import 'package:solian/widgets/auto_cache_image.dart';
import 'package:solian/widgets/chat/chat_event.dart';
import 'package:badges/badges.dart' as badges;
import 'package:uuid/uuid.dart';

class ChatMessageSuggestion {
  final String type;
  final Widget leading;
  final String display;
  final String content;

  ChatMessageSuggestion({
    required this.type,
    required this.leading,
    required this.display,
    required this.content,
  });
}

class ChatMessageInput extends StatefulWidget {
  final Event? edit;
  final Event? reply;
  final String? placeholder;
  final Channel channel;
  final String realm;
  final Function(Event) onSent;
  final Function()? onReset;

  const ChatMessageInput({
    super.key,
    this.edit,
    this.reply,
    this.placeholder,
    required this.channel,
    required this.realm,
    required this.onSent,
    this.onReset,
  });

  @override
  State<ChatMessageInput> createState() => _ChatMessageInputState();
}

class _ChatMessageInputState extends State<ChatMessageInput> {
  final TextEditingController _textController = TextEditingController();
  final FocusNode _focusNode = FocusNode();

  final List<String> _attachments = List.empty(growable: true);

  Event? _editTo;
  Event? _replyTo;

  void _editAttachments() {
    showModalBottomSheet(
      context: context,
      builder: (context) => AttachmentEditorPopup(
        pool: 'messaging',
        initialAttachments: _attachments,
        onAdd: (value) {
          setState(() {
            _attachments.add(value);
          });
        },
        onRemove: (value) {
          setState(() {
            _attachments.remove(value);
          });
        },
      ),
    );
  }

  List<String> _findMentionedUsers(String text) {
    RegExp regExp = RegExp(r'@[a-zA-Z0-9_]+');
    Iterable<RegExpMatch> matches = regExp.allMatches(text);

    List<String> mentionedUsers =
        matches.map((match) => match.group(0)!.substring(1)).toList();

    return mentionedUsers;
  }

  Future<void> _sendMessage() async {
    _focusNode.requestFocus();

    final AuthProvider auth = Get.find();
    final prof = auth.userProfile.value!;
    if (auth.isAuthorized.isFalse) return;

    final AttachmentUploaderController uploader = Get.find();
    if (uploader.queueOfUpload.any(
      ((x) => x.isUploading),
    )) {
      context.showErrorDialog('attachmentUploadInProgress'.tr);
      return;
    }

    Response resp;

    final mentionedUserNames = _findMentionedUsers(_textController.text);
    final mentionedUserIds = List<int>.empty(growable: true);

    var client = await auth.configureClient('auth');
    if (mentionedUserNames.isNotEmpty) {
      resp = await client.get('/users?name=${mentionedUserNames.join(',')}');
      if (resp.statusCode != 200) {
        context.showErrorDialog(resp.bodyString);
        return;
      } else {
        mentionedUserIds.addAll(
          resp.body.map((x) => Account.fromJson(x).id).toList().cast<int>(),
        );
      }
    }

    client = await auth.configureClient('messaging');

    if (_textController.text.trim().isEmpty && _attachments.isEmpty) return;

    const uuid = Uuid();
    final payload = {
      'uuid': uuid.v4(),
      'type': _editTo == null ? 'messages.new' : 'messages.edit',
      'body': {
        'text': _textController.text.trim(),
        'algorithm': 'plain',
        'attachments': List.from(_attachments),
        'related_users': [
          if (_replyTo != null) _replyTo!.sender.accountId,
          ...mentionedUserIds,
        ],
        if (_replyTo != null) 'quote_event': _replyTo!.id,
        if (_editTo != null) 'related_event': _editTo!.id,
        if (_editTo != null && _editTo!.body['quote_event'] != null)
          'quote_event': _editTo!.body['quote_event'],
      }
    };

    // The local mock data
    final sender = ChannelMember(
      id: 0,
      createdAt: DateTime.now(),
      updatedAt: DateTime.now(),
      account: Account.fromJson(prof),
      channelId: widget.channel.id,
      accountId: prof['id'],
      notify: 0,
    );
    final message = Event(
      id: 0,
      uuid: payload['uuid'] as String,
      createdAt: DateTime.now(),
      updatedAt: DateTime.now(),
      body: payload['body'] as Map<String, dynamic>,
      type: payload['type'] as String,
      sender: sender,
      channelId: widget.channel.id,
      senderId: sender.id,
    );

    if (_editTo == null) {
      message.isPending = true;
      widget.onSent(message);
    }

    _resetInput();

    if (_editTo != null) {
      resp = await client.put(
        '/channels/${widget.realm}/${widget.channel.alias}/messages/${_editTo!.id}',
        payload,
      );
    } else {
      resp = await client.post(
        '/channels/${widget.realm}/${widget.channel.alias}/messages',
        payload,
      );
    }

    if (resp.statusCode != 200) {
      context.showErrorDialog(resp.bodyString);
    }
  }

  Timer? _typingNotifyTimer;
  bool _typingStatus = false;

  Future<void> _sendTypingStatus() async {
    final WebSocketProvider ws = Get.find();
    ws.websocket?.sink.add(jsonEncode(
      NetworkPackage(
        method: 'status.typing',
        endpoint: 'messaging',
        payload: {
          'channel_id': widget.channel.id,
        },
      ).toJson(),
    ));
  }

  void _pingEnterMessageStatus() {
    if (!_typingStatus) {
      _sendTypingStatus();
      _typingStatus = true;
    }

    if (_typingNotifyTimer == null || !_typingNotifyTimer!.isActive) {
      _typingNotifyTimer?.cancel();
      _typingNotifyTimer = Timer(const Duration(milliseconds: 1850), () {
        _typingStatus = false;
      });
    }
  }

  void _resetInput() {
    if (widget.onReset != null) widget.onReset!();
    _editTo = null;
    _replyTo = null;
    _textController.clear();
    _attachments.clear();
    setState(() {});
  }

  void _syncWidget() {
    if (widget.edit != null && widget.edit!.type.startsWith('messages')) {
      final body = EventMessageBody.fromJson(widget.edit!.body);
      _editTo = widget.edit!;
      _textController.text = body.text;
      _attachments.addAll(
        widget.edit!.body['attachments']?.cast<String>() ?? List.empty(),
      );
    }
    if (widget.reply != null) {
      _replyTo = widget.reply!;
    }

    setState(() {});
  }

  Widget _buildSuggestion(ChatMessageSuggestion suggestion) {
    return ListTile(
      leading: suggestion.leading,
      title: Text(suggestion.display),
      subtitle: Text(suggestion.content),
    );
  }

  void _insertSuggestion(ChatMessageSuggestion suggestion) {
    final replaceText =
        _textController.text.substring(0, _textController.selection.baseOffset);
    var startText = '';
    final afterText = replaceText == _textController.text
        ? ''
        : _textController.text
            .substring(_textController.selection.baseOffset + 1);
    var insertText = '';

    if (suggestion.type == 'emotes') {
      insertText = '${suggestion.content} ';
      startText = replaceText.replaceFirstMapped(
        RegExp(r':(?:([-\w]+)~)?([-\w]+)$'),
        (Match m) => insertText,
      );
    }

    if (suggestion.type == 'users') {
      insertText = '${suggestion.content} ';
      startText = replaceText.replaceFirstMapped(
        RegExp(r'(?:\s|^)@([-\w]+)$'),
        (Match m) => insertText,
      );
    }

    if (insertText.isNotEmpty && startText.isNotEmpty) {
      _textController.text = startText + afterText;
      _textController.selection = TextSelection(
        baseOffset: startText.length,
        extentOffset: startText.length,
      );
    }
  }

  @override
  void didUpdateWidget(covariant ChatMessageInput oldWidget) {
    _syncWidget();
    super.didUpdateWidget(oldWidget);
  }

  @override
  void initState() {
    super.initState();
    _textController.addListener(_pingEnterMessageStatus);
  }

  @override
  void dispose() {
    _textController.removeListener(_pingEnterMessageStatus);
    _textController.dispose();
    _typingNotifyTimer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final notifyBannerActions = [
      TextButton(
        onPressed: _resetInput,
        child: Text('cancel'.tr),
      )
    ];

    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        if (_replyTo != null)
          MaterialBanner(
            leading: const FaIcon(FontAwesomeIcons.reply, size: 18),
            dividerColor: Colors.transparent,
            padding: const EdgeInsets.only(left: 20),
            backgroundColor: Theme.of(context)
                .colorScheme
                .surfaceContainerHighest
                .withOpacity(0.5),
            content: ChatEvent(
              item: _replyTo!,
              isContentPreviewing: true,
            ),
            actions: notifyBannerActions,
          ),
        if (_editTo != null)
          MaterialBanner(
            leading: const Icon(Icons.edit),
            dividerColor: Colors.transparent,
            padding: const EdgeInsets.only(left: 20),
            backgroundColor: Theme.of(context)
                .colorScheme
                .surfaceContainerHighest
                .withOpacity(0.5),
            content: ChatEvent(
              item: _editTo!,
              isContentPreviewing: true,
            ),
            actions: notifyBannerActions,
          ),
        SizedBox(
          height: 56,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.start,
            children: [
              Expanded(
                child: TypeAheadField<ChatMessageSuggestion>(
                  direction: VerticalDirection.up,
                  hideOnEmpty: true,
                  hideOnLoading: true,
                  controller: _textController,
                  focusNode: _focusNode,
                  hideOnSelect: false,
                  debounceDuration: const Duration(milliseconds: 500),
                  onSelected: (value) {
                    _insertSuggestion(value);
                  },
                  itemBuilder: (context, item) => _buildSuggestion(item),
                  builder: (context, controller, focusNode) {
                    return TextField(
                      controller: _textController,
                      focusNode: _focusNode,
                      maxLines: null,
                      autocorrect: true,
                      keyboardType: TextInputType.text,
                      decoration: InputDecoration.collapsed(
                        hintText: widget.placeholder ??
                            'messageInputPlaceholder'.trParams({
                              'channel': '#${widget.channel.alias}',
                            }),
                      ),
                      onSubmitted: (_) => _sendMessage(),
                      onTapOutside: (_) =>
                          FocusManager.instance.primaryFocus?.unfocus(),
                    );
                  },
                  suggestionsCallback: (search) async {
                    final searchText = _textController.text
                        .substring(0, _textController.selection.baseOffset);

                    final emojiMatch = RegExp(r':(?:([-\w]+)~)?([-\w]+)$')
                        .firstMatch(searchText);
                    if (emojiMatch != null) {
                      final StickerProvider stickers = Get.find();
                      final emoteSearch = emojiMatch[2]!;
                      final result = await stickers
                          .searchStickerByAlias(emoteSearch.substring(1));
                      return result
                          .map(
                            (x) => ChatMessageSuggestion(
                              type: 'emotes',
                              leading: AutoCacheImage(
                                x.imageUrl,
                                width: 28,
                                height: 28,
                                isDense: true,
                              ),
                              display: x.name,
                              content: x.textWarpedPlaceholder,
                            ),
                          )
                          .toList();
                    }

                    final userMatch =
                        RegExp(r'(?:\s|^)@([-\w]+)$').firstMatch(searchText);
                    if (userMatch != null) {
                      final userSearch = userMatch[1]!.toLowerCase();
                      final AuthProvider auth = Get.find();

                      final client = await auth.configureClient('auth');
                      final resp = await client.get(
                        '/users/search?probe=$userSearch',
                      );

                      final List<Account> result = resp.body
                          .map((x) => Account.fromJson(x))
                          .toList()
                          .cast<Account>();
                      return result
                          .map(
                            (x) => ChatMessageSuggestion(
                              type: 'users',
                              leading: AttachedCircleAvatar(content: x.avatar),
                              display: x.nick,
                              content: '@${x.name}',
                            ),
                          )
                          .toList();
                    }

                    return null;
                  },
                ),
              ),
              IconButton(
                icon: badges.Badge(
                  badgeContent: Text(
                    _attachments.length.toString(),
                    style: const TextStyle(color: Colors.white),
                  ),
                  showBadge: _attachments.isNotEmpty,
                  position: badges.BadgePosition.topEnd(
                    top: -12,
                    end: -8,
                  ),
                  child: const Icon(Icons.file_present_rounded),
                ),
                color: Colors.teal,
                onPressed: () => _editAttachments(),
              ),
              IconButton(
                icon: const Icon(Icons.send),
                color: Theme.of(context).colorScheme.primary,
                onPressed: () => _sendMessage(),
              )
            ],
          ).paddingOnly(left: 20, right: 16),
        ),
      ],
    );
  }
}