//
// Component: Button
//
// ========================================================================


// Variables
// ========================================================================

@button-text-color:                             @global-emphasis-color;
@button-text-hover-color:                       @global-emphasis-color;

//
// New
//

@button-transition-duration:                    0.1s;

@internal-button-mode:                          ; // strikethrough

@button-text-mode:                              line; // none, line, arrow, em-dash
@button-text-border-width:                      @global-border-width;
@button-text-border:                            currentColor;

@internal-button-text-arrow-image:               "../../../../uikit-themes/master/images/button-text-arrow.svg";
@internal-button-text-arrow-padding:            5px;
@internal-button-text-arrow-width:              22px;
@internal-button-text-arrow-width-animation:    5px;

@internal-button-text-em-dash-padding:          8px;
@internal-button-text-em-dash-size:             20px;


// Component
// ========================================================================

.hook-button() {
    transition: @button-transition-duration ease-in-out;
    transition-property: color, background-color, background-position, border-color, box-shadow;
}

.hook-button-hover() {}
.hook-button-focus() {}
.hook-button-active() {}

//
// Strikethrough
//

.hook-button() when (@internal-button-mode = strikethrough) {

    position: relative;

    &:not(.uk-button-text):not(.uk-button-link)::before {
        content: "";
        position: absolute;
        top: ~'calc(50% - 1px)';
        left: ~'calc(@{button-padding-horizontal} - 5px)';
        right: ~'calc(100% + 3px - (@{button-padding-horizontal} - 5px))';
        height: 1px;
        background-color: currentColor;
        transition: right 0.2s ease;
    }

}

.hook-button-hover() when (@internal-button-mode = strikethrough) {

    &:not(.uk-button-text):not(.uk-button-link)::before { right: ~'calc(@{button-padding-horizontal} - 5px)'; }

}

.hook-button-focus() when (@internal-button-mode = strikethrough) {

    &:not(.uk-button-text):not(.uk-button-link)::before { right: ~'calc(@{button-padding-horizontal} - 5px)'; }

}


// Style modifiers
// ========================================================================

.hook-button-default() {}

.hook-button-default-hover() {}

.hook-button-default-active() {}

//
// Primary
//

.hook-button-primary() {}

.hook-button-primary-hover() {}

.hook-button-primary-active() {}

//
// Secondary
//

.hook-button-secondary() {}

.hook-button-secondary-hover() {}

.hook-button-secondary-active() {}

//
// Danger
//

.hook-button-danger() {}

.hook-button-danger-hover() {}

.hook-button-danger-active() {}


// Disabled
// ========================================================================

.hook-button-disabled() when (@internal-button-mode = strikethrough) {

    &::before { display: none; }

}


// Size modifiers
// ========================================================================

.hook-button-small() when (@internal-button-mode = strikethrough) {

    &::before {
        left: ~'calc(@{button-small-padding-horizontal} - 3px)';
        right: ~'calc(100% + 3px - (@{button-small-padding-horizontal} - 3px))';
    }

}

.hook-button-large() when (@internal-button-mode = strikethrough) {

    &::before {
        left: ~'calc(@{button-large-padding-horizontal} - 5px)';
        right: ~'calc(100% + 3px - (@{button-large-padding-horizontal} - 5px))';
    }

}


// Text modifier
// ========================================================================

//
// Line effect
//

.hook-button-text() when (@button-text-mode = line) {

    position: relative;
    z-index: 0;

    &::before {
        content: "";
        position: absolute;
        bottom: 0;
        left: 0;
        right: 100%;
        z-index: -1;
        border-bottom: @button-text-border-width solid @button-text-border;
        transition: right 0.3s ease-out;
    }

}

.hook-button-text-hover() when (@button-text-mode = line) {

    &::before { right: 0; }

}

.hook-button-text-disabled() when (@button-text-mode = line) {

    &::before { display: none; }

}

//
// Icon
//

.hook-button-text() when (@button-text-mode = arrow) {

    position: relative;
    padding-right: (@internal-button-text-arrow-width + @internal-button-text-arrow-padding);

    &::before {
        content: "";
        position: absolute;
        top: 0;
        bottom: 0;
        right: 0;
        width: @internal-button-text-arrow-width;
        .svg-fill(@internal-button-text-arrow-image, "#000", @button-text-color);
        background-repeat: no-repeat;
        background-position: ~'calc(100% - @{internal-button-text-arrow-width-animation}) 50%';
        transition: background-position 0.2s ease-out;
    }

}

.hook-button-text-hover() when (@button-text-mode = arrow) {

    &::before {
        .svg-fill(@internal-button-text-arrow-image, "#000", @button-text-hover-color);
        background-position: 100% 50%;
    }

}

//
// Em dash
//

.hook-button-text() when (@button-text-mode = em-dash) {

    position: relative;
    padding-left: (@internal-button-text-em-dash-size + @internal-button-text-em-dash-padding);

    &::before {
        content: "";
        position: absolute;
        top: ~'calc(50% - 1px)';
        left: 0;
        width: @internal-button-text-em-dash-size;
        border-bottom: @button-text-border-width solid @button-text-border;
    }

}


// Link modifier
// ========================================================================

.hook-button-link() {}


// Miscellaneous
// ========================================================================

.hook-button-misc() when (@internal-button-mode = strikethrough) {

    .uk-button-small:hover,
    .uk-button-small:focus {

        &::before { right: ~'calc(@{button-small-padding-horizontal} - 3px)'; }

    }

    .uk-button-large:hover,
    .uk-button-large:focus {

        &::before { right: ~'calc(@{button-large-padding-horizontal} - 5px)'; }

    }

}


// Inverse
// ========================================================================

.hook-inverse-button-default() {}
.hook-inverse-button-default-hover() {}
.hook-inverse-button-default-active() {}

.hook-inverse-button-primary() {}
.hook-inverse-button-primary-hover() {}
.hook-inverse-button-primary-active() {}

.hook-inverse-button-secondary() {}
.hook-inverse-button-secondary-hover() {}
.hook-inverse-button-secondary-active() {}

.hook-inverse-button-text() when (@button-text-mode = arrow) {
    &::before { .svg-fill(@internal-button-text-arrow-image, "#000", @inverse-button-text-color); }
}
.hook-inverse-button-text-hover() when (@button-text-mode = arrow) {
    &::before { .svg-fill(@internal-button-text-arrow-image, "#000", @inverse-button-text-hover-color); }
}

.hook-inverse-button-text-disabled() {}

.hook-inverse-button-link() {}