import 'package:comunic/models/comment.dart';
import 'package:comunic/models/user.dart';
import 'package:comunic/ui/widgets/account_image_widget.dart';
import 'package:comunic/ui/widgets/network_image_widget.dart';
import 'package:comunic/utils/date_utils.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:flutter/material.dart';

/// Single comment tile
///
/// @author Pierre HUBERT

enum _CommentAction { DELETE, UPDATE }

class CommentTile extends StatelessWidget {
  final Comment comment;
  final User user;
  final void Function(Comment) onUpdateLike;
  final void Function(Comment) onUpdateComment;
  final void Function(Comment) onDeleteComment;

  const CommentTile({
    Key key,
    @required this.comment,
    @required this.user,
    @required this.onUpdateLike,
    @required this.onUpdateComment,
    @required this.onDeleteComment,
  })  : assert(comment != null),
        assert(user != null),
        assert(onUpdateLike != null),
        assert(onUpdateComment != null),
        assert(onDeleteComment != null),
        super(key: key);

  @override
  Widget build(BuildContext context) {
    return ListTile(
      leading: _buildAccountImageWidget(),
      title: Text(
        user.displayName,
      ),
      subtitle: _buildCommentContent(),
      trailing: Text(diffTimeFromNowToStr(comment.timeSent), style: TextStyle(fontSize: 10.0),),
    );
  }

  Widget _buildAccountImageWidget() {
    return PopupMenuButton<_CommentAction>(
      child: AccountImageWidget(
        user: user,
      ),
      onSelected: _selectedMenuOption,
      itemBuilder: (c) => [
            // Update comment content
            PopupMenuItem(
              enabled: comment.isOwner,
              child: Text(tr("Update")),
              value: _CommentAction.UPDATE,
            ),

            // Delete comment
            PopupMenuItem(
              enabled: comment.isOwner,
              child: Text(tr("Delete")),
              value: _CommentAction.DELETE,
            ),
          ],
    );
  }

  Widget _buildCommentContent() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: <Widget>[
        // Comment image
        Container(
          child: comment.hasImage
              ? NetworkImageWidget(
                  url: comment.imageURL,
                  allowFullScreen: true,
                  height: 100.0,
                  width: null,
                )
              : null,
        ),

        // Comment text
        Container(
          child: comment.hasContent
              ? Text(
                  comment.content,
                  style: TextStyle(color: Colors.black),
                )
              : null,
        ),

        // Comment likes
        _buildLikeButton(),
      ],
    );
  }

  String get _likeString {
    if (comment.likes == 0) return tr("Like");
    if (comment.likes == 1)
      return tr("1 Like");
    else
      return tr("%num% likes", args: {"num": comment.likes.toString()});
  }

  /// Build like button associated to this post
  Widget _buildLikeButton() {
    return Padding(
      padding: const EdgeInsets.only(top: 4.0, bottom: 4.0),
      child: Align(
        alignment: AlignmentDirectional.topStart,
        child: Column(
          children: <Widget>[
            InkWell(
              onTap: () => onUpdateLike(comment),
              child: Row(
                children: <Widget>[
                  Icon(
                    Icons.thumb_up,
                    color: comment.userLike ? Colors.blue : null,
                    size: 15.0,
                  ),
                  SizedBox(
                    width: 8.0,
                  ),
                  Text(_likeString),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  /// A menu option has been selected
  void _selectedMenuOption(_CommentAction value) {
    switch (value) {
      // Update comment content
      case _CommentAction.UPDATE:
        onUpdateComment(comment);
        break;

      // Delete comment
      case _CommentAction.DELETE:
        onDeleteComment(comment);
        break;
    }
  }
}