@use 'sass:map';
@use 'theming';
@use 'typography';
@use 'typography-utils';
@use 'private';


// Theme styles that only apply to the fill appearance of the form-field.

@mixin legacy-color($config-or-theme) {
    $config: theming.get-color-config($config-or-theme);
    $foreground: map.get($config, foreground);
    $is-dark-theme: map.get($config, is-dark);

    $fill-background: theming.get-color-from-palette($foreground, base, if($is-dark-theme, 0.1, 0.04));
    $fill-disabled-background: theming.get-color-from-palette($foreground, base, if($is-dark-theme, 0.05, 0.02));
    $underline-color: theming.get-color-from-palette($foreground, divider, if($is-dark-theme, 0.5, 0.42));
    $label-disabled-color: theming.get-color-from-palette($foreground, disabled-text);

    .mat-form-field-appearance-legacy {
        .mat-form-field-flex {
            background-color: transparent;
        }

        &.mat-form-field-disabled .mat-form-field-flex {
            background-color: $fill-disabled-background;
        }

        .mat-form-field-underline::before {
            background-color: transparent;
        }

        &.mat-form-field-disabled {
            .mat-form-field-label {
                color: $label-disabled-color;
            }

            .mat-form-field-underline::before {
                background-color: transparent;
            }
        }
    }
}

// Used to make instances of the _mat-form-field-label-floating mixin negligibly different,
// and prevent Google's CSS Optimizer from collapsing the declarations. This is needed because some
// of the selectors contain pseudo-classes not recognized in all browsers. If a browser encounters
// an unknown pseudo-class it will discard the entire rule set.
$fill-dedupe: 0;

// Applies a floating label above the form field control itself.
@mixin _label-floating($font-scale, $infix-padding, $infix-margin-top) {
    transform: translateY(-$infix-margin-top - $infix-padding + $fill-dedupe) scale($font-scale);
    width: private.private-div(100%, $font-scale) + $fill-dedupe;

    $fill-dedupe: $fill-dedupe + 0.00001 !global;
}

@mixin legacy-typography($config-or-theme) {
    $config: typography.private-typography-to-2014-config( theming.get-typography-config($config-or-theme));
    // The unit-less line-height from the font config.
    $line-height: typography-utils.line-height($config, input);
    // The amount to scale the font for the floating label and subscript.
    $subscript-font-scale: 0.75;
    // The padding on top of the infix.
    $infix-padding-top: 0.25em;
    // The padding below the infix.
    $infix-padding-bottom: 0.75em;
    // The margin applied to the form-field-infix to reserve space for the floating label.
    $infix-margin-top: $subscript-font-scale * typography-utils.private-coerce-unitless-to-em($line-height);
    // The amount we offset the label from the input text in the fill appearance.
    $fill-appearance-label-offset: -0.5em;

    .mat-form-field-appearance-legacy {
        .mat-form-field-infix {
            padding: $infix-padding-top 0 $infix-padding-bottom 0;
        }

        .mat-form-field-label {
            top: $infix-margin-top + $infix-padding-top;
            margin-top: $fill-appearance-label-offset;
        }

        &.mat-form-field-can-float {
            &.mat-form-field-should-float .mat-form-field-label,
            .mat-input-server:focus + .mat-form-field-label-wrapper .mat-form-field-label {
                @include _label-floating( $subscript-font-scale, $infix-padding-top + $fill-appearance-label-offset, $infix-margin-top);
            }
            // Server-side rendered matInput with a label attribute but label not shown
            // (used as a pure CSS stand-in for mat-form-field-should-float).
            .mat-input-server[label]:not(:label-shown) + .mat-form-field-label-wrapper
      .mat-form-field-label {
        @include _label-floating(
                $subscript-font-scale, $infix-padding-top + $fill-appearance-label-offset,
                $infix-margin-top);
      }
        }
    }
}

@mixin private-form-field-legacy-density($config-or-theme) {
}

@mixin legacy-theme($theme-or-color-config) {
    $theme: theming.private-legacy-get-theme($theme-or-color-config);

    @include theming.private-check-duplicate-theme-styles($theme, 'mat-form-field-legacy') {
        $color: theming.get-color-config($theme);
        $density: theming.get-density-config($theme);
        $typography: theming.get-typography-config($theme);

        @if $color != null {
            @include legacy-color($color);
        }

        @if $density != null {
            @include private-form-field-legacy-density($density);
        }

        @if $typography != null {
            @include legacy-typography($typography);
        }
    }
}
