aves/lib/widgets/common/search/page.dart

import 'package:aves/theme/durations.dart';
import 'package:aves/theme/themes.dart';
import 'package:aves/utils/debouncer.dart';
import 'package:aves/widgets/common/basic/scaffold.dart';
import 'package:aves/widgets/common/behaviour/pop/double_back.dart';
import 'package:aves/widgets/common/behaviour/pop/scope.dart';
import 'package:aves/widgets/common/behaviour/pop/tv_navigation.dart';
import 'package:aves/widgets/common/identity/aves_app_bar.dart';
import 'package:aves/widgets/common/search/delegate.dart';
import 'package:aves/widgets/common/search/route.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';

class SearchPage extends StatefulWidget {
  static const routeName = '/search';

  final AvesSearchDelegate delegate;
  final Animation<double> animation;

  const SearchPage({
    super.key,
    required this.delegate,
    required this.animation,
  });

  @override
  State<SearchPage> createState() => _SearchPageState();
}

class _SearchPageState extends State<SearchPage> {
  final Debouncer _debouncer = Debouncer(delay: ADurations.searchDebounceDelay);
  final FocusNode _searchFieldFocusNode = FocusNode();
  final DoubleBackPopHandler _doubleBackPopHandler = DoubleBackPopHandler();

  @override
  void initState() {
    super.initState();
    _registerWidget(widget);
    widget.animation.addStatusListener(_onAnimationStatusChanged);
    _searchFieldFocusNode.addListener(_onFocusChanged);
  }

  @override
  void didUpdateWidget(covariant SearchPage oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.delegate != widget.delegate) {
      _unregisterWidget(oldWidget);
      _registerWidget(widget);
    }
  }

  @override
  void dispose() {
    _unregisterWidget(widget);
    widget.animation.removeStatusListener(_onAnimationStatusChanged);
    _searchFieldFocusNode.dispose();
    _doubleBackPopHandler.dispose();
    widget.delegate.dispose();
    super.dispose();
  }

  void _registerWidget(SearchPage widget) {
    widget.delegate.queryTextController.addListener(_onQueryChanged);
    widget.delegate.currentBodyNotifier.addListener(_onSearchBodyChanged);
    widget.delegate.searchFieldFocusNode = _searchFieldFocusNode;
  }

  void _unregisterWidget(SearchPage widget) {
    widget.delegate.queryTextController.removeListener(_onQueryChanged);
    widget.delegate.currentBodyNotifier.removeListener(_onSearchBodyChanged);
    widget.delegate.searchFieldFocusNode = null;
  }

  void _onAnimationStatusChanged(AnimationStatus status) {
    if (status != AnimationStatus.completed) {
      return;
    }
    widget.animation.removeStatusListener(_onAnimationStatusChanged);
    Future.delayed(ADurations.pageTransitionAnimation * timeDilation).then((_) {
      if (!mounted) return;
      _searchFieldFocusNode.requestFocus();
    });
  }

  void _onFocusChanged() {
    if (_searchFieldFocusNode.hasFocus && widget.delegate.currentBody != SearchBody.suggestions) {
      widget.delegate.showSuggestions(context);
    }
  }

  void _onQueryChanged() {
    _debouncer(() {
      if (!mounted) return;
      // rebuild ourselves because query changed.
      setState(() {});
    });
  }

  void _onSearchBodyChanged() {
    setState(() {
      // rebuild ourselves because search body changed.
    });
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    Widget? body;
    switch (widget.delegate.currentBody) {
      case SearchBody.suggestions:
        body = KeyedSubtree(
          key: const ValueKey<SearchBody>(SearchBody.suggestions),
          child: widget.delegate.buildSuggestions(context),
        );
      case SearchBody.results:
        body = KeyedSubtree(
          key: const ValueKey<SearchBody>(SearchBody.results),
          child: widget.delegate.buildResults(context),
        );
      case null:
        break;
    }
    return AvesScaffold(
      appBar: AppBar(
        leading: Hero(
          tag: AvesAppBar.leadingHeroTag,
          transitionOnUserGestures: true,
          child: Center(child: widget.delegate.buildLeading(context)),
        ),
        title: Hero(
          tag: AvesAppBar.titleHeroTag,
          transitionOnUserGestures: true,
          child: DefaultTextStyle.merge(
            style: const TextStyle(fontFeatures: [FontFeature.disable('smcp')]),
            child: TextField(
              controller: widget.delegate.queryTextController,
              focusNode: _searchFieldFocusNode,
              decoration: InputDecoration(
                border: InputBorder.none,
                hintText: widget.delegate.searchFieldLabel,
                hintStyle: theme.inputDecorationTheme.hintStyle,
              ),
              textInputAction: TextInputAction.search,
              style: Themes.searchFieldStyle(context),
              onSubmitted: (_) => widget.delegate.showResults(context),
            ),
          ),
        ),
        actions: widget.delegate.buildActions(context),
      ),
      body: AvesPopScope(
        handlers: [
          TvNavigationPopHandler.pop,
          _doubleBackPopHandler.pop,
        ],
        child: AnimatedSwitcher(
          duration: const Duration(milliseconds: 300),
          child: body,
        ),
      ),
    );
  }
}