//
// Copyright 2017 Google Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

@use "sass:map";
@use "sass:meta";
@use "./functions";
@use "./custom-properties";

//
// Main theme colors for your brand.
//
// If you're a user customizing your color scheme in SASS, these are probably the only variables you need to change.
//

$primary: #6200ee !default; // baseline purple, 500 tone
$on-primary: if(
  functions.contrast-tone($primary) == 'dark',
  #000,
  #fff
) !default;

// The $mdc-theme-accent variable is DEPRECATED - it exists purely for backward compatibility.
// The $mdc-theme-secondary* variables should be used for all new projects.
$accent: #018786 !default; // baseline teal, 600 tone
$secondary: $accent !default;
$on-secondary: if(
  functions.contrast-tone($secondary) == 'dark',
  #000,
  #fff
) !default;
$background: #fff !default; // White

$surface: #fff !default;
$on-surface: if(
  functions.contrast-tone($surface) == 'dark',
  #000,
  #fff
) !default;

$error: #b00020 !default;
$on-error: if(functions.contrast-tone($error) == 'dark', #000, #fff) !default;

//
// Text colors according to light vs dark and text type.
//

$text-colors: (
  dark: (
    primary: rgba(black, 0.87),
    secondary: rgba(black, 0.54),
    hint: rgba(black, 0.38),
    disabled: rgba(black, 0.38),
    icon: rgba(black, 0.38),
  ),
  light: (
    primary: white,
    secondary: rgba(white, 0.7),
    hint: rgba(white, 0.5),
    disabled: rgba(white, 0.5),
    icon: rgba(white, 0.5),
  ),
) !default;

$text-emphasis: (
  high: 0.87,
  medium: 0.6,
  disabled: 0.38,
) !default;

@function ink-color-for-fill_($text-style, $fill-color) {
  $contrast-tone: functions.contrast-tone($fill-color);

  @return map.get(map.get($text-colors, $contrast-tone), $text-style);
}

//
// Primary text colors for each of the theme colors.
//

$property-values: (
  primary: $primary,
  secondary: $secondary,
  background: $background,
  surface: $surface,
  error: $error,
  on-primary: $on-primary,
  on-secondary: $on-secondary,
  on-surface: $on-surface,
  on-error: $on-error,
  text-primary-on-background: ink-color-for-fill_(primary, $background),
  text-secondary-on-background: ink-color-for-fill_(secondary, $background),
  text-hint-on-background: ink-color-for-fill_(hint, $background),
  text-disabled-on-background: ink-color-for-fill_(disabled, $background),
  text-icon-on-background: ink-color-for-fill_(icon, $background),
  text-primary-on-light: ink-color-for-fill_(primary, light),
  text-secondary-on-light: ink-color-for-fill_(secondary, light),
  text-hint-on-light: ink-color-for-fill_(hint, light),
  text-disabled-on-light: ink-color-for-fill_(disabled, light),
  text-icon-on-light: ink-color-for-fill_(icon, light),
  text-primary-on-dark: ink-color-for-fill_(primary, dark),
  text-secondary-on-dark: ink-color-for-fill_(secondary, dark),
  text-hint-on-dark: ink-color-for-fill_(hint, dark),
  text-disabled-on-dark: ink-color-for-fill_(disabled, dark),
  text-icon-on-dark: ink-color-for-fill_(icon, dark),
) !default;

// @deprecated use theme.property(). If you need to ensure the value is not a
// custom property, use custom-properties.is-custom-prop() to check if the value
// is a custom prop, then custom-properties.get-fallback() to get its value.
// If `$style` is a color (a literal color value, `currentColor`, or a CSS custom property), it is returned verbatim.
// Otherwise, `$style` is treated as a theme property name, and the corresponding value from
// `$mdc-theme-property-values` is returned. If this also fails, an error is thrown.
//
// This is mainly useful in situations where `mdc-theme-prop` cannot be used directly (e.g., `box-shadow`).
//
// Examples:
//
// 1. mdc-theme-prop-value(primary) => "#6200ee"
// 2. mdc-theme-prop-value(blue)    => "blue"
//
// NOTE: This function must be defined in _variables.scss instead of _functions.scss to avoid circular imports.
@function prop-value($style) {
  @if custom-properties.is-custom-prop($style) {
    @return custom-properties.get-fallback($style);
  }

  @if is-valid-theme-prop-value_($style) {
    @return $style;
  }

  @if not map.has-key($property-values, $style) {
    @error "Invalid theme property: '#{$style}'. Choose one of: #{map.keys($property-values)}";
  }

  @return map.get($property-values, $style);
}

// NOTE: This function must be defined in _variables.scss instead of _functions.scss to avoid circular imports.
@function accessible-ink-color($fill-color, $text-style: primary) {
  $fill-color-value: prop-value($fill-color);
  $color-map-for-tone: map.get(
    $text-colors,
    functions.contrast-tone($fill-color-value)
  );

  @if not map.has-key($color-map-for-tone, $text-style) {
    @error "Invalid $text-style: '#{$text-style}'. Choose one of: #{map.keys($color-map-for-tone)}";
  }

  @return map.get($color-map-for-tone, $text-style);
}

// NOTE: This function is depended upon by mdc-theme-prop-value (above) and thus must be defined in this file.
@function is-valid-theme-prop-value_($style) {
  @return meta.type-of($style) == 'color' or $style == 'currentColor' or
    str_slice($style, 1, 4) == 'var(' or $style == 'inherit' or $style ==
    'transparent' or
    // NOTE: `GrayText` is deprecated, but is the only feasible way to convey the
    // correct high-contrast mode colors in alignment with Windows system colors.
    $style == 'GrayText';
}

@function text-emphasis($emphasis) {
  @return map.get($text-emphasis, $emphasis);
}