// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:ui' show lerpDouble;

import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';

import 'color_scheme.dart';
import 'colors.dart';
import 'material_state.dart';
import 'text_theme.dart';
import 'theme.dart';

// Examples can assume:
// late BuildContext context;

/// Overrides the default values of visual properties for descendant
/// [DatePickerDialog] widgets.
///
/// Descendant widgets obtain the current [DatePickerThemeData] object with
/// [DatePickerTheme.of]. Instances of [DatePickerTheme] can
/// be customized with [DatePickerThemeData.copyWith].
///
/// Typically a [DatePickerTheme] is specified as part of the overall
/// [Theme] with [ThemeData.datePickerTheme].
///
/// All [DatePickerThemeData] properties are null by default. When null,
/// the [DatePickerDialog] computes its own default values, typically based on
/// the overall theme's [ThemeData.colorScheme], [ThemeData.textTheme], and
/// [ThemeData.iconTheme].
@immutable
class DatePickerThemeData with Diagnosticable {
  /// Creates a [DatePickerThemeData] that can be used to override default properties
  /// in a [DatePickerTheme] widget.
  const DatePickerThemeData({
    this.backgroundColor,
    this.elevation,
    this.shadowColor,
    this.surfaceTintColor,
    this.shape,
    this.headerBackgroundColor,
    this.headerForegroundColor,
    this.headerHeadlineStyle,
    this.headerHelpStyle,
    this.weekdayStyle,
    this.dayStyle,
    this.dayForegroundColor,
    this.dayBackgroundColor,
    this.dayOverlayColor,
    this.todayForegroundColor,
    this.todayBackgroundColor,
    this.todayBorder,
    this.yearStyle,
    this.yearForegroundColor,
    this.yearBackgroundColor,
    this.yearOverlayColor,
    this.rangePickerBackgroundColor,
    this.rangePickerElevation,
    this.rangePickerShadowColor,
    this.rangePickerSurfaceTintColor,
    this.rangePickerShape,
    this.rangePickerHeaderBackgroundColor,
    this.rangePickerHeaderForegroundColor,
    this.rangePickerHeaderHeadlineStyle,
    this.rangePickerHeaderHelpStyle,
    this.rangeSelectionBackgroundColor,
    this.rangeSelectionOverlayColor,
  });

  /// Overrides the default value of [Dialog.backgroundColor].
  final Color? backgroundColor;

  /// Overrides the default value of [Dialog.elevation].
  ///
  /// See also:
  ///   [Material.elevation], which explains how elevation is related to a component's shadow.
  final double? elevation;

  /// Overrides the default value of [Dialog.shadowColor].
  ///
  /// See also:
  ///   [Material.shadowColor], which explains how the shadow is rendered.
  final Color? shadowColor;

  /// Overrides the default value of [Dialog.surfaceTintColor].
  ///
  /// See also:
  ///   [Material.surfaceTintColor], which explains how this color is related to
  ///   [elevation] and [backgroundColor].
  final Color? surfaceTintColor;

  /// Overrides the default value of [Dialog.shape].
  ///
  /// If [elevation] is greater than zero then a shadow is shown and the shadow's
  /// shape mirrors the shape of the dialog.
  final ShapeBorder? shape;

  /// Overrides the header's default background fill color.
  ///
  /// The dialog's header displays the currently selected date.
  final Color? headerBackgroundColor;

  /// Overrides the header's default color used for text labels and icons.
  ///
  /// The dialog's header displays the currently selected date.
  ///
  /// This is used instead of the [TextStyle.color] property of [headerHeadlineStyle]
  /// and [headerHelpStyle].
  final Color? headerForegroundColor;

  /// Overrides the header's default headline text style.
  ///
  /// The dialog's header displays the currently selected date.
  ///
  /// The [TextStyle.color] of the [headerHeadlineStyle] is not used,
  /// [headerForegroundColor] is used instead.
  final TextStyle? headerHeadlineStyle;

  /// Overrides the header's default help text style.
  ///
  /// The help text (also referred to as "supporting text" in the Material
  /// spec) is usually a prompt to the user at the top of the header
  /// (i.e. 'Select date').
  ///
  /// The [TextStyle.color] of the [headerHelpStyle] is not used,
  /// [headerForegroundColor] is used instead.
  ///
  /// See also:
  ///   [DatePickerDialog.helpText], which specifies the help text.
  final TextStyle? headerHelpStyle;

  /// Overrides the default text style used for the row of weekday
  /// labels at the top of the date picker grid.
  final TextStyle? weekdayStyle;

  /// Overrides the default text style used for each individual day
  /// label in the grid of the date picker.
  ///
  /// The [TextStyle.color] of the [dayStyle] is not used,
  /// [dayForegroundColor] is used instead.
  final TextStyle? dayStyle;

  /// Overrides the default color used to paint the day labels in the
  /// grid of the date picker.
  ///
  /// This will be used instead of the color provided in [dayStyle].
  final MaterialStateProperty<Color?>? dayForegroundColor;

  /// Overrides the default color used to paint the background of the
  /// day labels in the grid of the date picker.
  final MaterialStateProperty<Color?>? dayBackgroundColor;

  /// Overriddes the default highlight color that's typically used to
  /// indicate that a day in the grid is focused, hovered, or pressed.
  final MaterialStateProperty<Color?>? dayOverlayColor;

  /// Overrides the default color used to paint the
  /// [DatePickerDialog.currentDate] label in the grid of the dialog's
  /// [CalendarDatePicker] and the corresponding year in the dialog's
  /// [YearPicker].
  ///
  /// This will be used instead of the [TextStyle.color] provided in [dayStyle].
  final MaterialStateProperty<Color?>? todayForegroundColor;

  /// Overrides the default color used to paint the background of the
  /// [DatePickerDialog.currentDate] label in the grid of the date picker.
  final MaterialStateProperty<Color?>? todayBackgroundColor;

  /// Overrides the border used to paint the
  /// [DatePickerDialog.currentDate] label in the grid of the date
  /// picker.
  ///
  /// The border side's [BorderSide.color] is not used,
  /// [todayForegroundColor] is used instead.
  final BorderSide? todayBorder;

  /// Overrides the default text style used to paint each of the year
  /// entries in the year selector of the date picker.
  ///
  /// The [TextStyle.color] of the [yearStyle] is not used,
  /// [yearForegroundColor] is used instead.
  final TextStyle? yearStyle;

  /// Overrides the default color used to paint the year labels in the year
  /// selector of the date picker.
  ///
  /// This will be used instead of the color provided in [yearStyle].
  final MaterialStateProperty<Color?>? yearForegroundColor;

  /// Overrides the default color used to paint the background of the
  /// year labels in the year selector of the of the date picker.
  final MaterialStateProperty<Color?>? yearBackgroundColor;

  /// Overrides the default highlight color that's typically used to
  /// indicate that a year in the year selector is focused, hovered,
  /// or pressed.
  final MaterialStateProperty<Color?>? yearOverlayColor;

  /// Overrides the default [Scaffold.backgroundColor] for
  /// [DateRangePickerDialog].
  final Color? rangePickerBackgroundColor;

  /// Overrides the default elevation of the full screen
  /// [DateRangePickerDialog].
  ///
  /// See also:
  ///   [Material.elevation], which explains how elevation is related to a component's shadow.
  final double? rangePickerElevation;

  /// Overrides the color of the shadow painted below a full screen
  /// [DateRangePickerDialog].
  ///
  /// See also:
  ///   [Material.shadowColor], which explains how the shadow is rendered.
  final Color? rangePickerShadowColor;

  /// Overrides the default color of the surface tint overlay applied
  /// to the [backgroundColor] of a full screen
  /// [DateRangePickerDialog]'s to indicate elevation.
  ///
  /// See also:
  ///   [Material.surfaceTintColor], which explains how this color is related to
  ///   [elevation].
  final Color? rangePickerSurfaceTintColor;

  /// Overrides the default overall shape of a full screen
  /// [DateRangePickerDialog].
  ///
  /// If [elevation] is greater than zero then a shadow is shown and the shadow's
  /// shape mirrors the shape of the dialog.
  ///
  ///   [Material.surfaceTintColor], which explains how this color is related to
  ///   [elevation].
  final ShapeBorder? rangePickerShape;

  /// Overrides the default background fill color for [DateRangePickerDialog].
  ///
  /// The dialog's header displays the currently selected date range.
  final Color? rangePickerHeaderBackgroundColor;

  /// Overrides the default color used for text labels and icons in
  /// the header of a full screen [DateRangePickerDialog]
  ///
  /// The dialog's header displays the currently selected date range.
  ///
  /// This is used instead of any colors provided by
  /// [rangePickerHeaderHeadlineStyle] or [rangePickerHeaderHelpStyle].
  final Color? rangePickerHeaderForegroundColor;

  /// Overrides the default text style used for the headline text in
  /// the header of a full screen [DateRangePickerDialog].
  ///
  /// The dialog's header displays the currently selected date range.
  ///
  /// The [TextStyle.color] of [rangePickerHeaderHeadlineStyle] is not used,
  /// [rangePickerHeaderForegroundColor] is used instead.
  final TextStyle? rangePickerHeaderHeadlineStyle;

  /// Overrides the default text style used for the help text of the
  /// header of a full screen [DateRangePickerDialog].
  ///
  /// The help text (also referred to as "supporting text" in the Material
  /// spec) is usually a prompt to the user at the top of the header
  /// (i.e. 'Select date').
  ///
  /// The [TextStyle.color] of the [rangePickerHeaderHelpStyle] is not used,
  /// [rangePickerHeaderForegroundColor] is used instead.
  ///
  /// See also:
  ///   [DateRangePickerDialog.helpText], which specifies the help text.
  final TextStyle? rangePickerHeaderHelpStyle;

  /// Overrides the default background color used to paint days
  /// selected between the start and end dates in a
  /// [DateRangePickerDialog].
  final Color? rangeSelectionBackgroundColor;

  /// Overrides the default highlight color that's typically used to
  /// indicate that a date in the selected range of a
  /// [DateRangePickerDialog] is focused, hovered, or pressed.
  final MaterialStateProperty<Color?>? rangeSelectionOverlayColor;

  /// Creates a copy of this object with the given fields replaced with the
  /// new values.
  DatePickerThemeData copyWith({
    Color? backgroundColor,
    double? elevation,
    Color? shadowColor,
    Color? surfaceTintColor,
    ShapeBorder? shape,
    Color? headerBackgroundColor,
    Color? headerForegroundColor,
    TextStyle? headerHeadlineStyle,
    TextStyle? headerHelpStyle,
    TextStyle? weekdayStyle,
    TextStyle? dayStyle,
    MaterialStateProperty<Color?>? dayForegroundColor,
    MaterialStateProperty<Color?>? dayBackgroundColor,
    MaterialStateProperty<Color?>? dayOverlayColor,
    MaterialStateProperty<Color?>? todayForegroundColor,
    MaterialStateProperty<Color?>? todayBackgroundColor,
    BorderSide? todayBorder,
    TextStyle? yearStyle,
    MaterialStateProperty<Color?>? yearForegroundColor,
    MaterialStateProperty<Color?>? yearBackgroundColor,
    MaterialStateProperty<Color?>? yearOverlayColor,
    Color? rangePickerBackgroundColor,
    double? rangePickerElevation,
    Color? rangePickerShadowColor,
    Color? rangePickerSurfaceTintColor,
    ShapeBorder? rangePickerShape,
    Color? rangePickerHeaderBackgroundColor,
    Color? rangePickerHeaderForegroundColor,
    TextStyle? rangePickerHeaderHeadlineStyle,
    TextStyle? rangePickerHeaderHelpStyle,
    Color? rangeSelectionBackgroundColor,
    MaterialStateProperty<Color?>? rangeSelectionOverlayColor,
  }) {
    return DatePickerThemeData(
      backgroundColor: backgroundColor ?? this.backgroundColor,
      elevation: elevation ?? this.elevation,
      shadowColor: shadowColor ?? this.shadowColor,
      surfaceTintColor: surfaceTintColor ?? this.surfaceTintColor,
      shape: shape ?? this.shape,
      headerBackgroundColor: headerBackgroundColor ?? this.headerBackgroundColor,
      headerForegroundColor: headerForegroundColor ?? this.headerForegroundColor,
      headerHeadlineStyle: headerHeadlineStyle ?? this.headerHeadlineStyle,
      headerHelpStyle: headerHelpStyle ?? this.headerHelpStyle,
      weekdayStyle: weekdayStyle ?? this.weekdayStyle,
      dayStyle: dayStyle ?? this.dayStyle,
      dayForegroundColor: dayForegroundColor ?? this.dayForegroundColor,
      dayBackgroundColor: dayBackgroundColor ?? this.dayBackgroundColor,
      dayOverlayColor: dayOverlayColor ?? this.dayOverlayColor,
      todayForegroundColor: todayForegroundColor ?? this.todayForegroundColor,
      todayBackgroundColor: todayBackgroundColor ?? this.todayBackgroundColor,
      todayBorder: todayBorder ?? this.todayBorder,
      yearStyle: yearStyle ?? this.yearStyle,
      yearForegroundColor: yearForegroundColor ?? this.yearForegroundColor,
      yearBackgroundColor: yearBackgroundColor ?? this.yearBackgroundColor,
      yearOverlayColor: yearOverlayColor ?? this.yearOverlayColor,
      rangePickerBackgroundColor: rangePickerBackgroundColor ?? this.rangePickerBackgroundColor,
      rangePickerElevation: rangePickerElevation ?? this.rangePickerElevation,
      rangePickerShadowColor: rangePickerShadowColor ?? this.rangePickerShadowColor,
      rangePickerSurfaceTintColor: rangePickerSurfaceTintColor ?? this.rangePickerSurfaceTintColor,
      rangePickerShape: rangePickerShape ?? this.rangePickerShape,
      rangePickerHeaderBackgroundColor: rangePickerHeaderBackgroundColor ?? this.rangePickerHeaderBackgroundColor,
      rangePickerHeaderForegroundColor: rangePickerHeaderForegroundColor ?? this.rangePickerHeaderForegroundColor,
      rangePickerHeaderHeadlineStyle: rangePickerHeaderHeadlineStyle ?? this.rangePickerHeaderHeadlineStyle,
      rangePickerHeaderHelpStyle: rangePickerHeaderHelpStyle ?? this.rangePickerHeaderHelpStyle,
      rangeSelectionBackgroundColor: rangeSelectionBackgroundColor ?? this.rangeSelectionBackgroundColor,
      rangeSelectionOverlayColor: rangeSelectionOverlayColor ?? this.rangeSelectionOverlayColor,
    );
  }

  /// Linearly interpolates between two [DatePickerThemeData].
  static DatePickerThemeData lerp(DatePickerThemeData? a, DatePickerThemeData? b, double t) {
    return DatePickerThemeData(
      backgroundColor: Color.lerp(a?.backgroundColor, b?.backgroundColor, t),
      elevation: lerpDouble(a?.elevation, b?.elevation, t),
      shadowColor: Color.lerp(a?.shadowColor, b?.shadowColor, t),
      surfaceTintColor: Color.lerp(a?.surfaceTintColor, b?.surfaceTintColor, t),
      shape: ShapeBorder.lerp(a?.shape, b?.shape, t),
      headerBackgroundColor: Color.lerp(a?.headerBackgroundColor, b?.headerBackgroundColor, t),
      headerForegroundColor: Color.lerp(a?.headerForegroundColor, b?.headerForegroundColor, t),
      headerHeadlineStyle: TextStyle.lerp(a?.headerHeadlineStyle, b?.headerHeadlineStyle, t),
      headerHelpStyle: TextStyle.lerp(a?.headerHelpStyle, b?.headerHelpStyle, t),
      weekdayStyle: TextStyle.lerp(a?.weekdayStyle, b?.weekdayStyle, t),
      dayStyle: TextStyle.lerp(a?.dayStyle, b?.dayStyle, t),
      dayForegroundColor: MaterialStateProperty.lerp<Color?>(a?.dayForegroundColor, b?.dayForegroundColor, t, Color.lerp),
      dayBackgroundColor: MaterialStateProperty.lerp<Color?>(a?.dayBackgroundColor, b?.dayBackgroundColor, t, Color.lerp),
      dayOverlayColor: MaterialStateProperty.lerp<Color?>(a?.dayOverlayColor, b?.dayOverlayColor, t, Color.lerp),
      todayForegroundColor: MaterialStateProperty.lerp<Color?>(a?.todayForegroundColor, b?.todayForegroundColor, t, Color.lerp),
      todayBackgroundColor: MaterialStateProperty.lerp<Color?>(a?.todayBackgroundColor, b?.todayBackgroundColor, t, Color.lerp),
      todayBorder: _lerpBorderSide(a?.todayBorder, b?.todayBorder, t),
      yearStyle: TextStyle.lerp(a?.yearStyle, b?.yearStyle, t),
      yearForegroundColor: MaterialStateProperty.lerp<Color?>(a?.yearForegroundColor, b?.yearForegroundColor, t, Color.lerp),
      yearBackgroundColor: MaterialStateProperty.lerp<Color?>(a?.yearBackgroundColor, b?.yearBackgroundColor, t, Color.lerp),
      yearOverlayColor: MaterialStateProperty.lerp<Color?>(a?.yearOverlayColor, b?.yearOverlayColor, t, Color.lerp),
      rangePickerBackgroundColor: Color.lerp(a?.rangePickerBackgroundColor, b?.rangePickerBackgroundColor, t),
      rangePickerElevation: lerpDouble(a?.rangePickerElevation, b?.rangePickerElevation, t),
      rangePickerShadowColor: Color.lerp(a?.rangePickerShadowColor, b?.rangePickerShadowColor, t),
      rangePickerSurfaceTintColor: Color.lerp(a?.rangePickerSurfaceTintColor, b?.rangePickerSurfaceTintColor, t),
      rangePickerShape: ShapeBorder.lerp(a?.rangePickerShape, b?.rangePickerShape, t),
      rangePickerHeaderBackgroundColor: Color.lerp(a?.rangePickerHeaderBackgroundColor, b?.rangePickerHeaderBackgroundColor, t),
      rangePickerHeaderForegroundColor: Color.lerp(a?.rangePickerHeaderForegroundColor, b?.rangePickerHeaderForegroundColor, t),
      rangePickerHeaderHeadlineStyle: TextStyle.lerp(a?.rangePickerHeaderHeadlineStyle, b?.rangePickerHeaderHeadlineStyle, t),
      rangePickerHeaderHelpStyle: TextStyle.lerp(a?.rangePickerHeaderHelpStyle, b?.rangePickerHeaderHelpStyle, t),
      rangeSelectionBackgroundColor: Color.lerp(a?.rangeSelectionBackgroundColor, b?.rangeSelectionBackgroundColor, t),
      rangeSelectionOverlayColor: MaterialStateProperty.lerp<Color?>(a?.rangeSelectionOverlayColor, b?.rangeSelectionOverlayColor, t, Color.lerp),
    );
  }

  static BorderSide? _lerpBorderSide(BorderSide? a, BorderSide? b, double t) {
    if (a == null && b == null) {
      return null;
    }
    if (a == null) {
      return BorderSide.lerp(BorderSide(width: 0, color: b!.color.withAlpha(0)), b, t);
    }
    return BorderSide.lerp(a, BorderSide(width: 0, color: a.color.withAlpha(0)), t);
  }

  @override
  int get hashCode => Object.hashAll(<Object?>[
    backgroundColor,
    elevation,
    shadowColor,
    surfaceTintColor,
    shape,
    headerBackgroundColor,
    headerForegroundColor,
    headerHeadlineStyle,
    headerHelpStyle,
    weekdayStyle,
    dayStyle,
    dayForegroundColor,
    dayBackgroundColor,
    dayOverlayColor,
    todayForegroundColor,
    todayBackgroundColor,
    todayBorder,
    yearStyle,
    yearForegroundColor,
    yearBackgroundColor,
    yearOverlayColor,
    rangePickerBackgroundColor,
    rangePickerElevation,
    rangePickerShadowColor,
    rangePickerSurfaceTintColor,
    rangePickerShape,
    rangePickerHeaderBackgroundColor,
    rangePickerHeaderForegroundColor,
    rangePickerHeaderHeadlineStyle,
    rangePickerHeaderHelpStyle,
    rangeSelectionBackgroundColor,
    rangeSelectionOverlayColor,
  ]);

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    return other is DatePickerThemeData
      && other.backgroundColor == backgroundColor
      && other.elevation == elevation
      && other.shadowColor == shadowColor
      && other.surfaceTintColor == surfaceTintColor
      && other.shape == shape
      && other.headerBackgroundColor == headerBackgroundColor
      && other.headerForegroundColor == headerForegroundColor
      && other.headerHeadlineStyle == headerHeadlineStyle
      && other.headerHelpStyle == headerHelpStyle
      && other.weekdayStyle == weekdayStyle
      && other.dayStyle == dayStyle
      && other.dayForegroundColor == dayForegroundColor
      && other.dayBackgroundColor == dayBackgroundColor
      && other.dayOverlayColor == dayOverlayColor
      && other.todayForegroundColor == todayForegroundColor
      && other.todayBackgroundColor == todayBackgroundColor
      && other.todayBorder == todayBorder
      && other.yearStyle == yearStyle
      && other.yearForegroundColor == yearForegroundColor
      && other.yearBackgroundColor == yearBackgroundColor
      && other.yearOverlayColor == yearOverlayColor
      && other.rangePickerBackgroundColor == rangePickerBackgroundColor
      && other.rangePickerElevation == rangePickerElevation
      && other.rangePickerShadowColor == rangePickerShadowColor
      && other.rangePickerSurfaceTintColor == rangePickerSurfaceTintColor
      && other.rangePickerShape == rangePickerShape
      && other.rangePickerHeaderBackgroundColor == rangePickerHeaderBackgroundColor
      && other.rangePickerHeaderForegroundColor == rangePickerHeaderForegroundColor
      && other.rangePickerHeaderHeadlineStyle == rangePickerHeaderHeadlineStyle
      && other.rangePickerHeaderHelpStyle == rangePickerHeaderHelpStyle
      && other.rangeSelectionBackgroundColor == rangeSelectionBackgroundColor
      && other.rangeSelectionOverlayColor == rangeSelectionOverlayColor;
  }

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(ColorProperty('backgroundColor', backgroundColor, defaultValue: null));
    properties.add(DoubleProperty('elevation', elevation, defaultValue: null));
    properties.add(ColorProperty('shadowColor', shadowColor, defaultValue: null));
    properties.add(ColorProperty('surfaceTintColor', surfaceTintColor, defaultValue: null));
    properties.add(DiagnosticsProperty<ShapeBorder>('shape', shape, defaultValue: null));
    properties.add(ColorProperty('headerBackgroundColor', headerBackgroundColor, defaultValue: null));
    properties.add(ColorProperty('headerForegroundColor', headerForegroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<TextStyle>('headerHeadlineStyle', headerHeadlineStyle, defaultValue: null));
    properties.add(DiagnosticsProperty<TextStyle>('headerHelpStyle', headerHelpStyle, defaultValue: null));
    properties.add(DiagnosticsProperty<TextStyle>('weekDayStyle', weekdayStyle, defaultValue: null));
    properties.add(DiagnosticsProperty<TextStyle>('dayStyle', dayStyle, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('dayForegroundColor', dayForegroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('dayBackgroundColor', dayBackgroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('dayOverlayColor', dayOverlayColor, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('todayForegroundColor', todayForegroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('todayBackgroundColor', todayBackgroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<BorderSide?>('todayBorder', todayBorder, defaultValue: null));
    properties.add(DiagnosticsProperty<TextStyle>('yearStyle', yearStyle, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('yearForegroundColor', yearForegroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('yearBackgroundColor', yearBackgroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('yearOverlayColor', yearOverlayColor, defaultValue: null));
    properties.add(ColorProperty('rangePickerBackgroundColor', rangePickerBackgroundColor, defaultValue: null));
    properties.add(DoubleProperty('rangePickerElevation', rangePickerElevation, defaultValue: null));
    properties.add(ColorProperty('rangePickerShadowColor', rangePickerShadowColor, defaultValue: null));
    properties.add(ColorProperty('rangePickerSurfaceTintColor', rangePickerSurfaceTintColor, defaultValue: null));
    properties.add(DiagnosticsProperty<ShapeBorder>('rangePickerShape', rangePickerShape, defaultValue: null));
    properties.add(ColorProperty('rangePickerHeaderBackgroundColor', rangePickerHeaderBackgroundColor, defaultValue: null));
    properties.add(ColorProperty('rangePickerHeaderForegroundColor', rangePickerHeaderForegroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<TextStyle>('rangePickerHeaderHeadlineStyle', rangePickerHeaderHeadlineStyle, defaultValue: null));
    properties.add(DiagnosticsProperty<TextStyle>('rangePickerHeaderHelpStyle', rangePickerHeaderHelpStyle, defaultValue: null));
    properties.add(ColorProperty('rangeSelectionBackgroundColor', rangeSelectionBackgroundColor, defaultValue: null));
    properties.add(DiagnosticsProperty<MaterialStateProperty<Color?>>('rangeSelectionOverlayColor', rangeSelectionOverlayColor, defaultValue: null));
  }
}

/// An inherited widget that defines the visual properties for
/// [DatePickerDialog]s in this widget's subtree.
///
/// Values specified here are used for [DatePickerDialog] properties that are not
/// given an explicit non-null value.
class DatePickerTheme extends InheritedTheme {
  /// Creates a [DatePickerTheme] that controls visual parameters for
  /// descendent [DatePickerDialog]s.
  const DatePickerTheme({
    super.key,
    required this.data,
    required super.child,
  });

  /// Specifies the visual properties used by descendant [DatePickerDialog]
  /// widgets.
  final DatePickerThemeData data;

  /// The [data] from the closest instance of this class that encloses the given
  /// context.
  ///
  /// If there is no [DatePickerTheme] in scope, this will return
  /// [ThemeData.datePickerTheme] from the ambient [Theme].
  ///
  /// Typical usage is as follows:
  ///
  /// ```dart
  /// DatePickerThemeData theme = DatePickerTheme.of(context);
  /// ```
  ///
  /// See also:
  ///
  ///  * [maybeOf], which returns null if it doesn't find a
  ///    [DatePickerTheme] ancestor.
  ///  * [defaults], which will return the default properties used when no
  ///    other [DatePickerTheme] has been provided.
  static DatePickerThemeData of(BuildContext context) {
    return maybeOf(context) ?? Theme.of(context).datePickerTheme;
  }

  /// The data from the closest instance of this class that encloses the given
  /// context, if any.
  ///
  /// Use this function if you want to allow situations where no
  /// [DatePickerTheme] is in scope. Prefer using [DatePickerTheme.of]
  /// in situations where a [DatePickerThemeData] is expected to be
  /// non-null.
  ///
  /// If there is no [DatePickerTheme] in scope, then this function will
  /// return null.
  ///
  /// Typical usage is as follows:
  ///
  /// ```dart
  /// DatePickerThemeData? theme = DatePickerTheme.maybeOf(context);
  /// if (theme == null) {
  ///   // Do something else instead.
  /// }
  /// ```
  ///
  /// See also:
  ///
  ///  * [of], which will return [ThemeData.datePickerTheme] if it doesn't
  ///    find a [DatePickerTheme] ancestor, instead of returning null.
  ///  * [defaults], which will return the default properties used when no
  ///    other [DatePickerTheme] has been provided.
  static DatePickerThemeData? maybeOf(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<DatePickerTheme>()?.data;
  }

  /// A DatePickerThemeData used as the default properties for date pickers.
  ///
  /// This is only used for properties not already specified in the ambient
  /// [DatePickerTheme.of].
  ///
  /// See also:
  ///
  ///  * [of], which will return [ThemeData.datePickerTheme] if it doesn't
  ///    find a [DatePickerTheme] ancestor, instead of returning null.
  ///  * [maybeOf], which returns null if it doesn't find a
  ///    [DatePickerTheme] ancestor.
  static DatePickerThemeData defaults(BuildContext context) {
    return Theme.of(context).useMaterial3
      ? _DatePickerDefaultsM3(context)
      : _DatePickerDefaultsM2(context);
  }

  @override
  Widget wrap(BuildContext context, Widget child) {
    return DatePickerTheme(data: data, child: child);
  }

  @override
  bool updateShouldNotify(DatePickerTheme oldWidget) => data != oldWidget.data;
}

// Hand coded defaults based on Material Design 2.
class _DatePickerDefaultsM2 extends DatePickerThemeData {
  _DatePickerDefaultsM2(this.context)
    : super(
        elevation: 24.0,
        shape: const RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(4.0))),
        rangePickerElevation: 0.0,
        rangePickerShape: const RoundedRectangleBorder(),
      );

  final BuildContext context;
  late final ThemeData _theme = Theme.of(context);
  late final ColorScheme _colors = _theme.colorScheme;
  late final TextTheme _textTheme = _theme.textTheme;
  late final bool _isDark = _colors.brightness == Brightness.dark;

  @override
  Color? get headerBackgroundColor => _isDark ? _colors.surface : _colors.primary;

  @override
  Color? get headerForegroundColor => _isDark ? _colors.onSurface : _colors.onPrimary;

  @override
  TextStyle? get headerHeadlineStyle => _textTheme.headlineSmall;

  @override
  TextStyle? get headerHelpStyle => _textTheme.labelSmall;

  @override
  TextStyle? get weekdayStyle => _textTheme.bodySmall?.apply(
    color: _colors.onSurface.withOpacity(0.60),
  );

  @override
  TextStyle? get dayStyle => _textTheme.bodySmall;

  @override
  MaterialStateProperty<Color?>? get dayForegroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.onPrimary;
      } else if (states.contains(MaterialState.disabled)) {
        return _colors.onSurface.withOpacity(0.38);
      }
      return _colors.onSurface;
    });

  @override
  MaterialStateProperty<Color?>? get dayBackgroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.primary;
      }
      return null;
    });

  @override
  MaterialStateProperty<Color?>? get dayOverlayColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onPrimary.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onPrimary.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onPrimary.withOpacity(0.38);
        }
      } else {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onSurfaceVariant.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
      }
      return null;
    });

  @override
  MaterialStateProperty<Color?>? get todayForegroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.onPrimary;
      } else if (states.contains(MaterialState.disabled)) {
        return _colors.onSurface.withOpacity(0.38);
      }
      return _colors.primary;
    });

  @override
  MaterialStateProperty<Color?>? get todayBackgroundColor => dayBackgroundColor;

  @override
  BorderSide? get todayBorder => BorderSide(color: _colors.primary);

  @override
  TextStyle? get yearStyle => _textTheme.bodyLarge;

  @override
  Color? get rangePickerBackgroundColor => _colors.surface;

  @override
  Color? get rangePickerShadowColor => Colors.transparent;

  @override
  Color? get rangePickerSurfaceTintColor => Colors.transparent;

  @override
  Color? get rangePickerHeaderBackgroundColor => _isDark ? _colors.surface : _colors.primary;

  @override
  Color? get rangePickerHeaderForegroundColor => _isDark ? _colors.onSurface : _colors.onPrimary;

  @override
  TextStyle? get rangePickerHeaderHeadlineStyle => _textTheme.headlineSmall;

  @override
  TextStyle? get rangePickerHeaderHelpStyle => _textTheme.labelSmall;

  @override
  Color? get rangeSelectionBackgroundColor => _colors.primary.withOpacity(0.12);

  @override
  MaterialStateProperty<Color?>? get rangeSelectionOverlayColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onPrimary.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onPrimary.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onPrimary.withOpacity(0.38);
        }
      } else {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onSurfaceVariant.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
      }
      return null;
    });
}

// BEGIN GENERATED TOKEN PROPERTIES - DatePicker

// Do not edit by hand. The code between the "BEGIN GENERATED" and
// "END GENERATED" comments are generated from data in the Material
// Design token database by the script:
//   dev/tools/gen_defaults/bin/gen_defaults.dart.

// Token database version: v0_150

class _DatePickerDefaultsM3 extends DatePickerThemeData {
  _DatePickerDefaultsM3(this.context)
    : super(
        elevation: 6.0,
        shape: const RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(28.0))),
        rangePickerElevation: 0.0,
        rangePickerShape: const RoundedRectangleBorder(),
      );

  final BuildContext context;
  late final ThemeData _theme = Theme.of(context);
  late final ColorScheme _colors = _theme.colorScheme;
  late final TextTheme _textTheme = _theme.textTheme;

  @override
  Color? get backgroundColor => _colors.surface;

  @override
  Color? get shadowColor => Colors.transparent;

  @override
  Color? get surfaceTintColor => _colors.surfaceTint;

  @override
  Color? get headerBackgroundColor => Colors.transparent;

  @override
  Color? get headerForegroundColor => _colors.onSurfaceVariant;

  @override
  TextStyle? get headerHeadlineStyle => _textTheme.headlineLarge;

  @override
  TextStyle? get headerHelpStyle => _textTheme.labelMedium;

  @override
  TextStyle? get weekdayStyle => _textTheme.bodySmall?.apply(
    color: _colors.onSurface,
  );

  @override
  TextStyle? get dayStyle => _textTheme.bodySmall;

  @override
  MaterialStateProperty<Color?>? get dayForegroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.onPrimary;
      } else if (states.contains(MaterialState.disabled)) {
        return _colors.onSurface.withOpacity(0.38);
      }
      return _colors.onSurface;
    });

  @override
  MaterialStateProperty<Color?>? get dayBackgroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.primary;
      }
      return null;
    });

  @override
  MaterialStateProperty<Color?>? get dayOverlayColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onPrimary.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onPrimary.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onPrimary.withOpacity(0.12);
        }
      } else {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onSurfaceVariant.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
      }
      return null;
    });

  @override
  MaterialStateProperty<Color?>? get todayForegroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.onPrimary;
      } else if (states.contains(MaterialState.disabled)) {
        return _colors.primary.withOpacity(0.38);
      }
      return _colors.primary;
    });

  @override
  MaterialStateProperty<Color?>? get todayBackgroundColor => dayBackgroundColor;

  @override
  BorderSide? get todayBorder => BorderSide(color: _colors.primary);

  @override
  TextStyle? get yearStyle => _textTheme.bodyLarge;

  @override
  MaterialStateProperty<Color?>? get yearForegroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.onPrimary;
      } else if (states.contains(MaterialState.disabled)) {
        return _colors.onSurfaceVariant.withOpacity(0.38);
      }
      return _colors.onSurfaceVariant;
    });

  @override
  MaterialStateProperty<Color?>? get yearBackgroundColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        return _colors.primary;
      }
      return null;
    });

  @override
  MaterialStateProperty<Color?>? get yearOverlayColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.selected)) {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onPrimary.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onPrimary.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onPrimary.withOpacity(0.12);
        }
      } else {
        if (states.contains(MaterialState.hovered)) {
          return _colors.onSurfaceVariant.withOpacity(0.08);
        }
        if (states.contains(MaterialState.focused)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
        if (states.contains(MaterialState.pressed)) {
          return _colors.onSurfaceVariant.withOpacity(0.12);
        }
      }
      return null;
    });

    @override
    Color? get rangePickerShadowColor => Colors.transparent;

    @override
    Color? get rangePickerSurfaceTintColor => Colors.transparent;

    @override
    Color? get rangeSelectionBackgroundColor => _colors.primaryContainer;

  @override
  MaterialStateProperty<Color?>? get rangeSelectionOverlayColor =>
    MaterialStateProperty.resolveWith((Set<MaterialState> states) {
      if (states.contains(MaterialState.hovered)) {
        return null;
      }
      if (states.contains(MaterialState.focused)) {
        return null;
      }
      if (states.contains(MaterialState.pressed)) {
        return null;
      }
      return null;
    });

  @override
  Color? get rangePickerHeaderBackgroundColor => Colors.transparent;

  @override
  Color? get rangePickerHeaderForegroundColor => _colors.onSurfaceVariant;

  @override
  TextStyle? get rangePickerHeaderHeadlineStyle => _textTheme.titleLarge;

  @override
  TextStyle? get rangePickerHeaderHelpStyle => _textTheme.titleSmall;


}

// END GENERATED TOKEN PROPERTIES - DatePicker
