import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:stream_chat/stream_chat.dart';
import 'package:stream_chat_flutter/src/reaction_bubble.dart';
import 'package:stream_chat_flutter/src/reaction_picker.dart';
import 'package:stream_chat_flutter/src/stream_chat.dart';
import 'package:stream_chat_flutter/src/user_avatar.dart';

import 'message_widget.dart';
import 'stream_chat_theme.dart';

class MessageReactionsModal extends StatelessWidget {
  final Widget Function(BuildContext, Message) editMessageInputBuilder;
  final void Function(Message) onThreadTap;
  final Message message;
  final MessageTheme messageTheme;
  final bool reverse;
  final bool showReactions;
  final ShapeBorder messageShape;
  final void Function(User) onUserAvatarTap;

  const MessageReactionsModal({
    Key key,
    @required this.message,
    @required this.messageTheme,
    this.showReactions = true,
    this.onThreadTap,
    this.editMessageInputBuilder,
    this.messageShape,
    this.reverse = false,
    this.onUserAvatarTap,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        Positioned.fill(
          child: GestureDetector(
            behavior: HitTestBehavior.translucent,
            onTap: () {
              Navigator.pop(context);
            },
            child: BackdropFilter(
              filter: ImageFilter.blur(
                sigmaX: 10,
                sigmaY: 10,
              ),
              child: Container(
                color: Colors.transparent,
              ),
            ),
          ),
        ),
        Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            if (showReactions &&
                (message.status == MessageSendingStatus.SENT ||
                    message.status == null))
              Center(
                child: ReactionPicker(
                  message: message,
                  messageTheme: messageTheme,
                ),
              ),
            AbsorbPointer(
              child: MessageWidget(
                key: Key('MessageWidget'),
                reverse: reverse,
                message: message.text.length > 200
                    ? message.copyWith(
                        text: '${message.text.substring(0, 200)}...')
                    : message,
                messageTheme: messageTheme,
                showReactions: false,
                showUsername: false,
                showReplyIndicator: false,
                showTimestamp: false,
                showSendingIndicator: DisplayWidget.gone,
                shape: messageShape,
              ),
            ),
            SizedBox(
              height: 16,
            ),
            if (message.latestReactions?.isNotEmpty == true)
              Container(
                constraints: BoxConstraints.loose(Size.fromHeight(400)),
                child: _buildReactionCard(context),
              ),
          ],
        ),
      ],
    );
  }

  Padding _buildReactionCard(BuildContext context) {
    final currentUser = StreamChat.of(context).user;
    return Padding(
      padding: const EdgeInsets.symmetric(
        horizontal: 8.0,
      ),
      child: Card(
        clipBehavior: Clip.hardEdge,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16),
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Padding(
              padding: const EdgeInsets.all(16.0),
              child: Text(
                'Message Reactions',
                style: Theme.of(context).textTheme.headline6,
              ),
            ),
            Flexible(
              child: SingleChildScrollView(
                child: Padding(
                  padding: const EdgeInsets.only(
                    left: 18,
                    right: 18,
                    bottom: 26,
                  ),
                  child: Wrap(
                    spacing: 16,
                    runSpacing: 22,
                    alignment: WrapAlignment.start,
                    children: message.latestReactions
                        .map((e) => _buildReaction(
                              e,
                              currentUser,
                              context,
                            ))
                        .toList(),
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildReaction(
    Reaction reaction,
    User currentUser,
    BuildContext context,
  ) {
    final isCurrentUser = reaction.user.id == currentUser.id;
    return ConstrainedBox(
      constraints: BoxConstraints.loose(Size(
        64,
        98,
      )),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        mainAxisAlignment: MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          Stack(
            children: [
              UserAvatar(
                onTap: onUserAvatarTap,
                user: reaction.user,
                constraints: BoxConstraints.tightFor(
                  height: 64,
                  width: 64,
                ),
                borderRadius: BorderRadius.circular(32),
              ),
              Positioned(
                child: ReactionBubble(
                  reactions: [reaction],
                  borderColor: isCurrentUser
                      ? messageTheme.ownReactionsBorderColor
                      : messageTheme.otherReactionsBorderColor,
                  backgroundColor: isCurrentUser
                      ? messageTheme.ownReactionsBackgroundColor
                      : messageTheme.otherReactionsBackgroundColor,
                  flipTail: !isCurrentUser,
                ),
                bottom: 0,
                left: isCurrentUser ? 0 : null,
                right: isCurrentUser ? 0 : null,
              ),
            ],
          ),
          Text(
            reaction.user.name,
            style: Theme.of(context).textTheme.subtitle2,
            textAlign: TextAlign.center,
          ),
        ],
      ),
    );
  }
}