done_task

import 'package:flutter/material.dart';

void main() {
  runApp(BooksApp());
}

class BooksApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Каталог книг',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: CategoryScreen(),
    );
  }
}

class CategoryScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Жанры'),
      ),
      body: ListView.builder(
        itemCount: genres.length,
        itemBuilder: (context, index) {
          final genre = genres[index];
          return ListTile(
            title: Text(genre.name),
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => BooksScreen(genre: genre),
                ),
              );
            },
          );
        },
      ),
    );
  }
}

class BooksScreen extends StatelessWidget {
  final Genre genre;

  BooksScreen({required this.genre});

  @override
  Widget build(BuildContext context) {
    final genreBooks = books.where((book) => book.genreId == genre.id).toList();
    return Scaffold(
      appBar: AppBar(
        title: Text(genre.name),
      ),
      body: ListView.builder(
        itemCount: genreBooks.length,
        itemBuilder: (context, index) {
          final book = genreBooks[index];
          return ListTile(
            leading: Image.network(book.previewUrl, width: 50, height: 50, fit: BoxFit.cover),
            title: Text(book.name),
            subtitle: Text(book.author),
            onTap: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => BookDetailScreen(book: book, genre: genre),
                ),
              );
            },
          );
        },
      ),
    );
  }
}

class BookDetailScreen extends StatelessWidget {
  final Book book;
  final Genre genre;

  BookDetailScreen({required this.book, required this.genre});

  @override
  Widget build(BuildContext context) {
    final author = authors.firstWhere((author) => author.fullname == book.author);
    return Scaffold(
      appBar: AppBar(
        title: Text(book.name),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Image.network(book.previewUrl, height: 200, fit: BoxFit.cover),
            SizedBox(height: 16),
            Text(book.name, style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold)),
            SizedBox(height: 8),
            Text('Автор: ', style: TextStyle(fontSize: 18)),
            GestureDetector(
              onTap: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(
                    builder: (context) => AuthorDetailScreen(author: author, genre: genre),
                  ),
                );
              },
              child: Text(
                author.fullname,
                style: TextStyle(fontSize: 18, color: Colors.blue),
              ),
            ),
            SizedBox(height: 8),
            Text('Количество страниц: ${book.pages}', style: TextStyle(fontSize: 18)),
            SizedBox(height: 8),
            Text('Название издания: ${book.edition}', style: TextStyle(fontSize: 18)),
          ],
        ),
      ),
    );
  }
}

class AuthorDetailScreen extends StatelessWidget {
  final Author author;
  final Genre genre;

  AuthorDetailScreen({required this.author, required this.genre});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(author.fullname),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Image.network(author.photo, height: 200, fit: BoxFit.cover),
            SizedBox(height: 16),
            Text('ФИО: ${author.fullname}', style: TextStyle(fontSize: 24)),
            SizedBox(height: 8),
            Text('Дата рождения: ${author.birthyear}', style: TextStyle(fontSize: 18)),
            SizedBox(height: 16),
            ElevatedButton(
              onPressed: () {
                Navigator.pushAndRemoveUntil(
                  context,
                  MaterialPageRoute(
                    builder: (context) => BooksScreen(genre: genre),
                  ),
                  ModalRoute.withName('/'),
                );
              },
              child: Text('Вернутся к жанру: ${genre.name}'),
            ),
          ],
        ),
      ),
    );
  }
}


class Book {
  final int id;
  final String name;
  final String author;
  final int pages;
  final String edition;
  final String previewUrl;
  final int genreId;

  Book({
    required this.id,
    required this.name,
    required this.author,
    required this.pages,
    required this.edition,
    required this.previewUrl,
    required this.genreId,
  });
}

class Author {
  final int id;
  final String fullname;
  final String photo;
  final int birthyear;

  Author({
    required this.id,
    required this.fullname,
    required this.photo,
    required this.birthyear,
  });
}

class Genre {
  final int id;
  final String name;

  Genre({required this.id, required this.name});
}


List<Book> books = [
  Book(id: 1, name: 'Да не умер он в конце драйва', author: 'Райан Гослинг', pages: 198, edition: 'Легендарное издание', previewUrl: 'https://example.com/book.jpg', genreId: 1),
  Book(id: 2, name: 'Тест книга', author: 'Тест автор', pages: 15, edition: 'тестовое издание', previewUrl: 'https://example.com/book.jpg', genreId: 2),

];

List<Author> authors = [
  Author(id: 1, fullname: 'Райан Гослинг', photo: 'https://cdn.britannica.com/93/215393-050-E428CADE/Canadian-actor-musician-Ryan-Gosling-2016.jpg?w=300', birthyear: 1970),
  Author(id: 2, fullname: 'Тест автор', photo: 'https://example.com/person2.jpg', birthyear: 1980),

];

List<Genre> genres = [
  Genre(id: 1, name: 'Триллер'),
  Genre(id: 2, name: 'Тестовый жанр'),

];