Vaani/lib/features/item_viewer/view/library_item_page.dart

import 'dart:math';

import 'package:animated_theme_switcher/animated_theme_switcher.dart';
import 'package:flutter/material.dart';
import 'package:flutter_animate/flutter_animate.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:vaani/api/library_item_provider.dart';
import 'package:vaani/features/item_viewer/view/library_item_sliver_app_bar.dart';
import 'package:vaani/features/player/view/mini_player_bottom_padding.dart';
import 'package:vaani/router/models/library_item_extras.dart';
import 'package:vaani/shared/widgets/expandable_description.dart';

import 'library_item_actions.dart';
import 'library_item_hero_section.dart';
import 'library_item_metadata.dart';

class LibraryItemPage extends HookConsumerWidget {
  const LibraryItemPage({
    super.key,
    required this.itemId,
    this.extra,
  });

  final String itemId;
  final Object? extra;
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final additionalItemData =
        extra is LibraryItemExtras ? extra as LibraryItemExtras : null;

    return ThemeProvider(
      initTheme: Theme.of(context),
      duration: 200.ms,
      child: ThemeSwitchingArea(
        child: Scaffold(
          body: CustomScrollView(
            slivers: [
              const LibraryItemSliverAppBar(),
              SliverPadding(
                padding: const EdgeInsets.all(8),
                sliver: LibraryItemHeroSection(
                  itemId: itemId,
                  extraMap: additionalItemData,
                ),
              ),
              // a horizontal display with dividers of metadata
              SliverToBoxAdapter(
                child: LibraryItemMetadata(id: itemId),
              ),
              // a row of actions like play, download, share, etc
              SliverToBoxAdapter(
                child: LibraryItemActions(id: itemId),
              ),
              // a expandable section for book description
              SliverToBoxAdapter(
                child: LibraryItemDescription(id: itemId),
              ),
              // a padding at the bottom to make sure the last item is not hidden by mini player
              const SliverToBoxAdapter(child: MiniPlayerBottomPadding()),
            ],
          ),
        ),
      ),
    );
  }
}

class LibraryItemDescription extends HookConsumerWidget {
  const LibraryItemDescription({
    super.key,
    required this.id,
  });

  final String id;
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final item = ref.watch(libraryItemProvider(id)).valueOrNull;
    if (item == null) {
      return const SizedBox();
    }
    return ExpandableDescription(
      title: 'About the Book',
      content: item.media.metadata.description ?? 'Sorry, no description found',
    );
  }
}

/// Calculate the width of the book cover based on the screen size
double calculateWidth(
  BuildContext context,
  BoxConstraints constraints, {
  /// width ratio of the cover image to the available width
  double widthRatio = 0.4,

  /// height ratio of the cover image to the available height
  double maxHeightToUse = 0.25,
}) {
  final availHeight =
      min(constraints.maxHeight, MediaQuery.of(context).size.height);
  final availWidth =
      min(constraints.maxWidth, MediaQuery.of(context).size.width);

  // make the width widthRatio of the available width
  var width = availWidth * widthRatio;
  // but never exceed more than heightRatio of height
  if (width > availHeight * maxHeightToUse) {
    width = availHeight * maxHeightToUse;
  }

  return width;
}