MovieDetail

import 'dart:async';

import 'package:flutter/material.dart';
import '../blocs/movie_detail_bloc.dart';
import '../models/trailer_model.dart';

class MovieDetail extends StatefulWidget {
  final MovieDetailBloc bloc;
  final String posterUrl;
  final String description;
  final String releaseDate;
  final String title;
  final String voteAverage;
  final int movieId;

  MovieDetail(
    this.bloc,
    this.title,
    this.posterUrl,
    this.description,
    this.releaseDate,
    this.voteAverage,
    this.movieId,
  );

  @override
  State<StatefulWidget> createState() {
    return MovieDetailState(
      title: title,
      posterUrl: posterUrl,
      description: description,
      releaseDate: releaseDate,
      voteAverage: voteAverage,
      movieId: movieId,
    );
  }
}

class MovieDetailState extends State<MovieDetail> {
  final String posterUrl;
  final String description;
  final String releaseDate;
  final String title;
  final String voteAverage;
  final int movieId;

  MovieDetailState({
    this.title,
    this.posterUrl,
    this.description,
    this.releaseDate,
    this.voteAverage,
    this.movieId,
  });

  @override
  void initState() {
    super.initState();
    widget.bloc.init();
    widget.bloc.fetchTrailersById(movieId);
  }

  @override
  void dispose() {
    widget.bloc.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        top: false,
        bottom: false,
        child: NestedScrollView(
            headerSliverBuilder:
                (BuildContext context, bool innerBoxIsScrolled) {
              return <Widget>[
                SliverAppBar(
                  expandedHeight: 200.0,
                  floating: false,
                  pinned: true,
                  elevation: 0.0,
                  flexibleSpace: FlexibleSpaceBar(
                      background: Image.network(
                    "https://image.tmdb.org/t/p/w500$posterUrl",
                    fit: BoxFit.cover,
                  )),
                ),
              ];
            },
            body: ListView(
              children: <Widget>[
                Padding(
                  padding: const EdgeInsets.all(10.0),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      Container(margin: EdgeInsets.only(top: 5.0)),
                      Text(
                        title,
                        style: TextStyle(
                          fontSize: 25.0,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      Container(margin: EdgeInsets.only(top: 8.0, bottom: 8.0)),
                      Row(
                        children: <Widget>[
                          Icon(
                            Icons.favorite,
                            color: Colors.red,
                          ),
                          Container(
                            margin: EdgeInsets.only(left: 1.0, right: 1.0),
                          ),
                          Text(
                            voteAverage,
                            style: TextStyle(
                              fontSize: 18.0,
                            ),
                          ),
                          Container(
                            margin: EdgeInsets.only(left: 10.0, right: 10.0),
                          ),
                          Text(
                            releaseDate,
                            style: TextStyle(
                              fontSize: 18.0,
                            ),
                          ),
                        ],
                      ),
                      Container(margin: EdgeInsets.only(top: 8.0, bottom: 8.0)),
                      Text(description),
                      Container(margin: EdgeInsets.only(top: 8.0, bottom: 8.0)),
                      Text(
                        "Trailer",
                        style: TextStyle(
                          fontSize: 25.0,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                      Container(margin: EdgeInsets.only(top: 8.0, bottom: 8.0)),
                      StreamBuilder(
                        stream: widget.bloc.movieTrailers,
                        builder: (context,
                            AsyncSnapshot<Future<TrailerModel>> snapshot) {
                          if (snapshot.hasData) {
                            return FutureBuilder(
                              future: snapshot.data,
                              builder: (context,
                                  AsyncSnapshot<TrailerModel> itemSnapShot) {
                                if (itemSnapShot.hasData) {
                                  if (itemSnapShot.data.results.length > 0)
                                    return trailerLayout(itemSnapShot.data);
                                  else
                                    return noTrailer(itemSnapShot.data);
                                } else {
                                  return Center(
                                      child: CircularProgressIndicator());
                                }
                              },
                            );
                          } else {
                            return Center(child: CircularProgressIndicator());
                          }
                        },
                      ),
                    ],
                  ),
                ),
              ],
            )),
      ),
    );
  }

  Widget noTrailer(TrailerModel data) {
    return Center(
      child: Container(
        child: Text("No trailer available"),
      ),
    );
  }

  Widget trailerLayout(TrailerModel data) {
    if (data.results.length > 1) {
      return Row(
        children: <Widget>[
          trailerItem(data, 0),
          trailerItem(data, 1),
        ],
      );
    } else {
      return Row(
        children: <Widget>[
          trailerItem(data, 0),
        ],
      );
    }
  }

  trailerItem(TrailerModel data, int index) {
    return Expanded(
      child: Column(
        children: <Widget>[
          Container(
            margin: EdgeInsets.all(5.0),
            height: 100.0,
            color: Colors.grey,
            child: Center(child: Icon(Icons.play_circle_filled)),
          ),
          Text(
            data.results[index].name,
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
          ),
        ],
      ),
    );
  }
}