////
/// Copyright (c) 2016-2021 Martin Donath <martin.donath@squidfunk.com>
///
/// 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 NON-INFRINGEMENT. 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
////

@import "material-color";

///
/// Strip units from a number
///
@function strip-units($number) {
  @return $number / ($number * 0 + 1);
}

///
/// Convert color in HEX to HSL
///
/// Note, that we need to strip the `deg` units from the `hue` value, as they
/// were added in Color Level 4, which not all browsers support.
///
@function hex2hsl($color) {
  @return
          round(strip-units(hue($color))),
          round(saturation($color)),
          round(lightness($color));
}

// Slate theme, i.e. dark mode
& {

  // Slate's hue in the range [0,360] - change this variable to alter the tone
  // of the theme, e.g. to make it more redish or greenish. This is a slate-
  // specific variable, but the same approach may be adapted to custom themes.
  --md-hue: 232;

  // Default color shades
  --md-default-fg-color:             hsla(var(--md-hue), 75%, 95%, 1);
  --md-default-fg-color--light:      hsla(var(--md-hue), 75%, 90%, 0.62);
  --md-default-fg-color--lighter:    hsla(var(--md-hue), 75%, 90%, 0.32);
  --md-default-fg-color--lightest:   hsla(var(--md-hue), 75%, 90%, 0.12);
  --md-default-bg-color:             hsla(var(--md-hue), 15%, 21%, 1);
  --md-default-bg-color--light:      hsla(var(--md-hue), 15%, 21%, 0.54);
  --md-default-bg-color--lighter:    hsla(var(--md-hue), 15%, 21%, 0.26);
  --md-default-bg-color--lightest:   hsla(var(--md-hue), 15%, 21%, 0.07);

  // Code color shades
  --md-code-fg-color:                hsla(var(--md-hue), 18%, 86%, 1);
  --md-code-bg-color:                hsla(var(--md-hue), 15%, 15%, 1);

  // Code highlighting color shades
  --md-code-hl-color:                hsla(#{hex2hsl($clr-blue-a200)}, 0.15);
  --md-code-hl-number-color:         hsla(6, 74%, 63%, 1);
  --md-code-hl-special-color:        hsla(340, 83%, 66%, 1);
  --md-code-hl-function-color:       hsla(291, 57%, 65%, 1);
  --md-code-hl-constant-color:       hsla(250, 62%, 70%, 1);
  --md-code-hl-keyword-color:        hsla(219, 66%, 64%, 1);
  --md-code-hl-string-color:         hsla(150, 58%, 44%, 1);
  --md-code-hl-name-color:           var(--md-code-fg-color);
  --md-code-hl-operator-color:       var(--md-default-fg-color--light);
  --md-code-hl-punctuation-color:    var(--md-default-fg-color--light);
  --md-code-hl-comment-color:        var(--md-default-fg-color--light);
  --md-code-hl-generic-color:        var(--md-default-fg-color--light);
  --md-code-hl-variable-color:       var(--md-default-fg-color--light);

  // Typeset color shades
  --md-typeset-color:                var(--md-default-fg-color);
  --md-typeset-a-color:              var(--md-primary-fg-color);

  // Typeset `mark` color shades
  --md-typeset-mark-color:           hsla(#{hex2hsl($clr-blue-a200)}, 0.3);

  // Typeset `kbd` color shades
  --md-typeset-kbd-color:            hsla(var(--md-hue), 15%, 94%, 0.12);
  --md-typeset-kbd-accent-color:     hsla(var(--md-hue), 15%, 94%, 0.2);
  --md-typeset-kbd-border-color:     hsla(var(--md-hue), 15%, 14%, 1);

  // Admonition color shades
  --md-admonition-bg-color:          hsla(var(--md-hue), 0%, 100%, 0.025);

  // Footer color shades
  --md-footer-bg-color:              hsla(var(--md-hue), 15%, 12%, 0.87);
  --md-footer-bg-color--dark:        hsla(var(--md-hue), 15%, 10%, 1);

  // Black and white primary colors
  &[data-md-color-primary="black"],
  &[data-md-color-primary="white"] {

    // Typeset color shades
    --md-typeset-a-color:            hsla(#{hex2hsl($clr-indigo-400)}, 1);
  }
}
