// 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));
}

// Foreground colors
$fg_color: if($variant == 'light', scale-alpha(#000000, 0.8), #FFFFFF);
$secondary_fg_color: scale-alpha($fg_color, $enabled_opacity);
$tertiary_fg_color: scale-alpha($fg_color, $hint_opacity);

$selected_fg_color: #FFFFFF;
$secondary_selected_fg_color: scale-alpha($selected_fg_color, $enabled_opacity);
$tertiary_selected_fg_color: scale-alpha($selected_fg_color, $hint_opacity);

$topbar_fg_color: if($light == 'true', $fg_color, $selected_fg_color);
$secondary_topbar_fg_color: if($light == 'true', $secondary_fg_color, $secondary_selected_fg_color);
$tertiary_topbar_fg_color: if($light == 'true', $tertiary_fg_color, $tertiary_selected_fg_color);

$insensitive_fg_color: scale-alpha($fg_color, $disabled_opacity);
$insensitive_secondary_fg_color: scale-alpha($secondary_fg_color, $disabled_opacity);
$insensitive_tertiary_fg_color: scale-alpha($tertiary_fg_color, $disabled_opacity);

$insensitive_selected_fg_color: scale-alpha($selected_fg_color, $disabled_opacity);
$insensitive_secondary_selected_fg_color: scale-alpha($secondary_selected_fg_color, $disabled_opacity);
$insensitive_tertiary_selected_fg_color: scale-alpha($tertiary_selected_fg_color, $disabled_opacity);

$insensitive_topbar_fg_color: if($light == 'true', $insensitive_fg_color, $insensitive_selected_fg_color);
$insensitive_secondary_topbar_fg_color: if($light == 'true', $insensitive_secondary_fg_color, $insensitive_secondary_selected_fg_color);
$insensitive_tertiary_topbar_fg_color: if($light == 'true', $insensitive_tertiary_fg_color, $insensitive_tertiary_selected_fg_color);

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

$selected_bg_color: #42A5F5;
$secondary_selected_bg_color: #40C4FF;
$accent_bg_color: #FF4081;

// Misc colors
$track_color: gtkalpha(currentColor, $lower_opacity);
$borders_color: if($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', $selected_bg_color, currentColor);

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

$link_color: $selected_bg_color;
$link_visited_color: #E040FB;

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

$suggested_color: $accent_bg_color;
$destructive_color: #FF5252;

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