// Copyright (C) 2023 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

import 'package:flutter/material.dart';
import 'package:wyatt_ui_components/wyatt_ui_components.dart';

/// {@template component_theme}
/// A [ComponentTheme] widget that provides a [ComponentThemeData] to its
/// descendants.
/// {@endtemplate}
class ComponentTheme extends StatelessWidget {
  /// {@macro component_theme}
  const ComponentTheme({
    required this.child,
    required this.data,
    super.key,
  });

  /// The [ComponentThemeData] of this widget.
  ///
  /// This contains all components instances of the theme.
  final ComponentThemeData data;

  /// The widget below this widget in the tree.
  final Widget child;

  /// Returns the [ComponentThemeData] of the closest ancestor [ComponentTheme]
  /// widget. If there is no ancestor [ComponentTheme] widget, it throws an
  /// assertion error.
  static ComponentThemeData of(BuildContext context) {
    final _InheritedComponentTheme? inheritedThemeComponent =
        context.dependOnInheritedWidgetOfExactType<_InheritedComponentTheme>();

    assert(
      inheritedThemeComponent != null,
      'Theme component not find in tree',
    );
    return inheritedThemeComponent!.themeWidget.data;
  }

  /// Returns the [ComponentThemeData] of the closest ancestor [ComponentTheme]
  /// widget. If there is no ancestor [ComponentTheme] widget, it returns null.
  static ComponentThemeData? maybeOf(BuildContext context) {
    final _InheritedComponentTheme? inheritedThemeComponent =
        context.dependOnInheritedWidgetOfExactType<_InheritedComponentTheme>();

    return inheritedThemeComponent?.themeWidget.data;
  }

  @override
  Widget build(BuildContext context) => _InheritedComponentTheme(
        this,
        child: child,
      );
}

class _InheritedComponentTheme extends InheritedWidget {
  const _InheritedComponentTheme(
    this.themeWidget, {
    required super.child,
  });
  final ComponentTheme themeWidget;

  @override
  bool updateShouldNotify(covariant InheritedWidget oldWidget) =>
      oldWidget != this;
}