// When color definition differs for dark and light variant,
// it gets @if ed depending on $variant

$higher_opacity: 0.9;
$middle_opacity: 0.6;
$lower_opacity: 0.3;

$enabled_opacity: 0.75;
$hint_opacity: 0.6;
$disabled_opacity: 0.4;

@function gtkalpha($c, $a) {
  @return unquote("alpha(#{$c}, #{$a})");
}

@function scale-alpha($c, $a) {
  @return scale-color($c, $alpha: percentage(-1 + $a));
}

// based color palette:
// https://material.google.com/style/color.html#color-color-palette
// based border and highlight values:
// https://material.google.com/style/icons.html#icons-product-icons

// Foreground colors
$light_contrast_color: scale-alpha(#000000, 0.8);
$dark_contrast_color: #FFFFFF;

$fg_color: if($variant == 'light', $light_contrast_color, $dark_contrast_color);
$secondary_fg_color: scale-alpha($fg_color, $enabled_opacity);
$tertiary_fg_color: scale-alpha($fg_color, $hint_opacity);

$inversed_fg_color: $dark_contrast_color;
$secondary_inversed_fg_color: scale-alpha($inversed_fg_color, $enabled_opacity);
$tertiary_inversed_fg_color: scale-alpha($inversed_fg_color, $hint_opacity);

$topbar_fg_color: if($light == 'true', $fg_color, $inversed_fg_color);
$secondary_topbar_fg_color: if($light == 'true', $secondary_fg_color, $secondary_inversed_fg_color);
$tertiary_topbar_fg_color: if($light == 'true', $tertiary_fg_color, $tertiary_inversed_fg_color);

$disabled_fg_color: scale-alpha($fg_color, $disabled_opacity);
$disabled_secondary_fg_color: scale-alpha($secondary_fg_color, $disabled_opacity);
$disabled_tertiary_fg_color: scale-alpha($tertiary_fg_color, $disabled_opacity);

$disabled_inversed_fg_color: scale-alpha($inversed_fg_color, $disabled_opacity);
$disabled_secondary_inversed_fg_color: scale-alpha($secondary_inversed_fg_color, $disabled_opacity);
$disabled_tertiary_inversed_fg_color: scale-alpha($tertiary_inversed_fg_color, $disabled_opacity);

$disabled_topbar_fg_color: if($light == 'true', $disabled_fg_color, $disabled_inversed_fg_color);
$disabled_secondary_topbar_fg_color: if($light == 'true', $disabled_secondary_fg_color, $disabled_secondary_inversed_fg_color);
$disabled_tertiary_topbar_fg_color: if($light == 'true', $disabled_tertiary_fg_color, $disabled_tertiary_inversed_fg_color);

// Background colors
$bg_color: if($variant == 'light', #F5F5F5, #455A64);
$base_color: if($variant == 'light', #FFFFFF, #546E7A);
$alt_base_color: mix($base_color, $bg_color, 50%);
$lighter_bg_color: if($variant == 'light', #FAFAFA, #607D8B);
$darker_bg_color: if($variant == 'light', #EEEEEE, #263238);
$headerbar_color: if($variant == 'light', if($light == 'true', #E0E0E0, #455A64), #37474F);
$secondary_titlebar_color: if($light == 'true', #BDBDBD, #37474F);
$topbar_color: if($light == 'true', #BDBDBD, #263238);

$primary_color: #42A5F5;
$alt_primary_color: #40C4FF;
$accent_color: #FF4081;

// Misc colors
$track_color: gtkalpha(currentColor, $lower_opacity);
$semi_track_color: gtkalpha(currentColor, $lower_opacity / 2);
$row_track_color: gtkalpha(currentColor, 0.05);
$borders_color: if($variant == 'light', scale-alpha(#000000, 0.1), scale-alpha(#000000, 0.2));
$highlight_color: if($variant == 'light', scale-alpha(#FFFFFF, 0.4), scale-alpha(#FFFFFF, 0.1));
$secondary_highlight_color: scale-alpha(#FFFFFF, 0.2);
$topbar_highlight_color: if($light == 'true', $highlight_color, $secondary_highlight_color);
$topbar_indicator_color: if($light == 'true', $primary_color, currentColor);

$placeholder_text_color: mix($fg_color, $base_color, percentage($hint_opacity));

$link_color: $primary_color;
$link_visited_color: #E040FB;

$warning_color: #FF6D00;
$error_color: #DD2C00;
$success_color: #00C853;

$suggested_color: $accent_color;
$destructive_color: #FF5252;

$info_bg_color: #66BB6A;
$question_bg_color: #42A5F5;
$warning_bg_color: #FFA726;
$error_bg_color: #EF5350;