//------------------------------------------------------------------------------
// Colors
//------------------------------------------------------------------------------

// Color combinations
$o-color-combinations: o-safe-nth($o-color-combinations-presets, $o-color-combinations-preset-number, ()) !default;
$-combination-additions: ();
@for $index from 1 through length($o-color-combinations) {
    $combination: map-merge($o-base-color-combination, nth($o-color-combinations, $index));

    @each $element, $color in $combination {
        $-combination-additions: map-merge($-combination-additions, (
            'o-cc#{$index}-#{$element}': $color,
        ));
    }
}

// Colors
$o-color-palette: o-safe-nth($o-color-palettes, $o-color-palette-number, ()) !default;
// Original color palette can contain override of the default combinations (so keep 'null' values for this merge)
$o-color-palette: map-merge($-combination-additions, $o-color-palette);
$o-color-palette: map-merge($o-base-color-palette, o-map-omit($o-color-palette));

// Theme colors
$o-theme-color-palette: o-safe-nth($o-theme-color-palettes, $o-theme-color-palette-number, ()) !default;
@if not $o-support-13-0-color-system {
    $o-theme-color-palette: map-remove($o-theme-color-palette, 'alpha', 'beta', 'gamma', 'delta', 'epsilon');
}
$-main-color: map-get($o-color-palette, 'o-color-1');
$-main-color-lightness: lightness($-main-color);
$o-theme-color-palette: map-merge((
    // color 1 and 2 are used to override primary and secondary BS4
    // colors by default, so that theme colors affect the default Odoo layouts
    'primary': $-main-color,
    'secondary': map-get($o-color-palette, 'o-color-2'),

    // BS light and dark colors are not used for any BS component, just
    // for color utilities. By default, we set them to a very light and
    // very dark version of a desaturate version of the main color
    'light': lighten(desaturate($-main-color, 80%), min(70%, max(0%, 97% - $-main-color-lightness))), // Does not increase over 97% lightness
    'dark': darken(desaturate($-main-color, 80%), min(70%, max(0%, $-main-color-lightness - 10%))), // Does not lower under 10% lightness
), o-map-omit($o-theme-color-palette));
$o-theme-color-palette: map-merge($o-base-theme-color-palette, o-map-omit($o-theme-color-palette));

// Gray colors
// Extend grays with transparent ones (for some reason, BS4 create black-50 and
// white-50 but does not allow overridding that with variables).
$o-gray-color-palette: o-safe-nth($o-gray-color-palettes, $o-gray-color-palette-number, ()) !default;
$o-gray-color-palette: map-merge($o-transparent-grays, o-map-omit($o-gray-color-palette));
$o-gray-color-palette: map-merge($o-base-gray-color-palette, o-map-omit($o-gray-color-palette));

$o-color-system-initialized: false;

// Returns:
// - true if the given name is a css color or null
// - false if a potential valid color name
// - throws an error if the given arg cannot reference a color
@function check-color-identifier-type($name) {
    $-type: type-of($name);
    @if $-type == 'color' or $-type == 'null' {
        @return true;
    } @else if $-type != 'string' {
        @error "Color name '#{$name}' is of unsupported type '#{$-type}'";
    }
    @return false;
}
@function use-cc-bg($name) {
    @if type-of($name) == 'number' {
        // Preset number, let's return the background color of the related
        // preset.
        @return 'o-cc#{$name}-bg';
    }
    @return $name;
}
// Looks up for the color related to the given name in the related odoo palettes
// following redirection a maximum number of time (by default none).
@function o-related-color($name, $max-recursions: 0, $original-name: $name, $use-cc-bg: false) {
    @if $use-cc-bg {
        $name: use-cc-bg($name);
    } @else if type-of($name) == 'number' {
        @return $name;
    }

    @if $max-recursions < 0 or check-color-identifier-type($name) {
        @return $name;
    }

    $-value: null;
    @if map-has-key($o-color-palette, $name) {
        $-value: map-get($o-color-palette, $name);
    } @else if map-has-key($o-theme-color-palette, $name) {
        $-value: map-get($o-theme-color-palette, $name);
    } @else if map-has-key($o-gray-color-palette, $name) {
        $-value: map-get($o-gray-color-palette, $name);
    }
    @return o-related-color($-value, $max-recursions - 1, $original-name);
}
// Function which allows to retrieve a color value from a name, the color being
// either in $theme-colors, $grays or $colors maps. If those maps are not
// initialized yet, it will look up the color in the related odoo palettes.
@function o-color($name) {
    $name: use-cc-bg($name);

    @if check-color-identifier-type($name) {
        @return $name;
    }

    // When the system is initialized, it means that the bootstrap maps have
    // been configured and contain a direct mapping between color name -> css
    // value. We can thus search in those.
    @if $o-color-system-initialized {
        @if map-has-key($colors, $name) {
            @return color($name);
        }
        @if map-has-key($theme-colors, $name) {
            @return theme-color($name);
        }
        @if map-has-key($grays, $name) {
            @return gray($name);
        }
    }

    // If not initialized, search the css color value in selected color palettes
    @return o-related-color($name, $max-recursions: 10, $use-cc-bg: true);
}

// Same as 'increase-contrast' except that the color is not changed if the given
// related color name is part of the given exclusion list (default to a global
// exclusion list which can be extended by other apps).
$o-we-auto-contrast-exclusions: () !default;
@function auto-contrast($color1, $color2, $color1-name, $exclude: $o-we-auto-contrast-exclusions) {
    @if index($exclude, $color1-name) {
        @return $color1;
    }
    @return increase-contrast($color1, $color2);
}