@use 'sass:list';
@use 'iro-sass/src/index' as iro;
@use '../functions' as fn;

$sizes:         'sm' 'lg' 'xl' !default;
$themes:        'accent' 'negative' !default;
$static-themes: 'black' 'white' !default;

@mixin theme($theme: ()) {
    &:link,
    &:visited,
    &:enabled {
        border-color:     transparent;
        background-color: fn.color(list.join($theme, --bg));
        color:            fn.color(list.join($theme, --label));
    }
    
    @include iro.bem-modifier('outline') {
        &:link,
        &:visited,
        &:enabled {
            border-color:     fn.color(list.join($theme, --outline-border));
            background-color: transparent;
            color:            fn.color(list.join($theme, --outline-label));
        }
    }

    &:link,
    &:visited,
    &:enabled {
        &:hover,
        &:focus-visible {
            border-color:     transparent;
            background-color: fn.color(list.join($theme, --hover --bg));
            color:            fn.color(list.join($theme, --hover --label));
        }

        &:active {
            border-color:     transparent;
            background-color: fn.color(list.join($theme, --active --bg));
            color:            fn.color(list.join($theme, --active --label));
        }
    }
}

@mixin static-theme($theme: ()) {
    border-color:     transparent;
    background-color: fn.color(list.join($theme, --disabled --bg));
    color:            fn.color(list.join($theme, --disabled --label));

    &::after {
        outline:    fn.color(list.join($theme, --key-focus --border)) solid fn.dim(--key-focus --border);
        box-shadow: 0 0 0 calc(fn.dim(--key-focus --border) + fn.dim(--key-focus --outline)) fn.color(list.join($theme, --key-focus --outline));
    }
    
    @include iro.bem-modifier('outline') {
        border-color:     fn.color(list.join($theme, --disabled --outline-border));
        background-color: transparent;
    }

    @include theme($theme);

    @include iro.bem-modifier('primary') {
        @include theme(list.join($theme, --primary));
    }
}

@include iro.props-namespace('button') {
    @include iro.props-store((
        --dims: (
            --line-height: 1.4,
            --pad-i:       fn.global-dim(--size --150),
            --pad-i-label: fn.global-dim(--size --75),
            --pad-b:       fn.global-dim(--size --65),
            --border:      fn.global-dim(--border --medium),
            --rounding:    10em,
            --font-size:   fn.global-dim(--font-size --100),

            --sm: (
                --pad-i:       fn.global-dim(--size --100),
                --pad-i-label: fn.global-dim(--size --50),
                --pad-b:       fn.global-dim(--size --25),
                --font-size:   fn.global-dim(--font-size --75),
            ),
            --lg: (
                --pad-i:       fn.global-dim(--size --200),
                --pad-i-label: fn.global-dim(--size --100),
                --pad-b:       fn.global-dim(--size --100),
                --font-size:   fn.global-dim(--font-size --150),
            ),
            --xl: (
                --pad-i:       fn.global-dim(--size --250),
                --pad-i-label: fn.global-dim(--size --150),
                --pad-b:       fn.global-dim(--size --150),
                --font-size:   fn.global-dim(--font-size --200),
            ),
            
            --key-focus: (
                --border:        fn.global-dim(--key-focus --border),
                --border-offset: fn.global-dim(--key-focus --border-offset),
                --outline:       fn.global-dim(--key-focus --outline),
            ),
        ),
        --colors: (
            --bg:             fn.global-color(--border-mute),
            --label:          fn.global-color(--text),
            --outline-border: fn.global-color(--border),
            --outline-label:  fn.global-color(--text),

            --hover: (
                --bg:     fn.global-color(--border),
                --label:  fn.global-color(--heading),
            ),
            --active: (
                --bg:     fn.global-color(--border-strong),
                --label:  fn.global-color(--heading),
            ),
            --disabled: (
                --bg:             fn.global-color(--border-mute),
                --outline-border: fn.global-color(--border),
                --label:          fn.global-color(--text-disabled),
            ),
            --key-focus: (
                --label:   fn.global-color(--focus --text),
                --border:  fn.global-color(--focus --border),
                --outline: fn.global-color(--focus --outline),
            ),
            
            --primary: (
                --bg:             fn.global-color(--base --800),
                --label:          fn.global-color(--base --800-text),
                --outline-border: fn.global-color(--base --800),
                --outline-label:  fn.global-color(--text),

                --hover: (
                    --bg:     fn.global-color(--base --900),
                    --label:  fn.global-color(--base --900-text),
                ),
                --active: (
                    --bg:     fn.global-color(--base --900),
                    --label:  fn.global-color(--base --900-text),
                ),
            ),
        ),
    ));

    @each $theme in $themes {
        @include iro.props-store((
            --colors: (
                --#{$theme}: (
                    --bg:             fn.global-color(--#{$theme}-static --900),
                    --label:          fn.global-color(--#{$theme}-static --900-text),
                    --outline-border: fn.global-color(--#{$theme} --900),
                    --outline-label:  fn.global-color(--#{$theme} --1000),

                    --hover: (
                        --bg:     fn.global-color(--#{$theme}-static --1000),
                        --label:  fn.global-color(--#{$theme}-static --1000-text),
                    ),
                    --active: (
                        --bg:     fn.global-color(--#{$theme}-static --1100),
                        --label:  fn.global-color(--#{$theme}-static --1100-text),
                    ),
                ),
            ),
        ));
    }

    @each $theme in $static-themes {
        @include iro.props-store((
            --colors: (
                --static-#{$theme}: (
                    --bg:             fn.global-color(--#{$theme}-transparent --200),
                    --label:          fn.global-color(--#{$theme}-transparent --900),
                    --outline-border: fn.global-color(--#{$theme}-transparent --300),
                    --outline-label:  fn.global-color(--#{$theme}-transparent --900),

                    --hover: (
                        --bg:     fn.global-color(--#{$theme}-transparent --300),
                        --label:  fn.global-color(--#{$theme}-transparent --900),
                    ),
                    --active: (
                        --bg:     fn.global-color(--#{$theme}-transparent --400),
                        --label:  fn.global-color(--#{$theme}-transparent --900),
                    ),
                    --disabled: (
                        --bg:             fn.global-color(--#{$theme}-transparent --200),
                        --outline-border: fn.global-color(--#{$theme}-transparent --300),
                        --label:          fn.global-color(--#{$theme}-transparent --500),
                    ),
                    --key-focus: (
                        --bg:      fn.global-color(--#{$theme}-transparent --100),
                        --label:   fn.global-color(--#{$theme}-transparent --900),
                        --border:  fn.global-color(--#{$theme}-transparent --900),
                        --outline: fn.global-color(--#{$theme}-transparent --300),
                    ),

                    --primary: (
                        --bg:             fn.global-color(--#{$theme}-transparent --800),
                        --label:          fn.global-color(--#{$theme}-transparent --text),
                        --outline-border: fn.global-color(--#{$theme}-transparent --800),
                        --outline-label:  fn.global-color(--#{$theme}-transparent --900),
    
                        --hover: (
                            --bg:     fn.global-color(--#{$theme}-transparent --900),
                            --label:  fn.global-color(--#{$theme}-transparent --text),
                        ),
                        --active: (
                            --bg:     fn.global-color(--#{$theme}-transparent --900),
                            --label:  fn.global-color(--#{$theme}-transparent --text),
                        ),
                    ),
                ),
            ),
        ));
    }

    @include iro.bem-object(iro.props-namespace()) {
        display:          inline-block;
        position:         relative;
        padding-block:    fn.dim(--pad-b);
        padding-inline:   fn.dim(--pad-i);
        border:           fn.dim(--border) solid transparent;
        border-radius:    fn.dim(--rounding);
        border-color:     fn.color(--disabled --bg);
        background-color: fn.color(--disabled --bg);
        color:            fn.color(--disabled --label);
        font-size:        fn.dim(--font-size);
        font-weight:      500;
        line-height:      fn.dim(--line-height);
        text-align:       center;
        text-decoration:  none;

        &::after {
            content:        '';
            display:        none;
            position:       absolute;
            z-index:        1;
            inset:          calc(-1 * fn.dim(--border) - fn.dim(--key-focus --border-offset));
            border-radius:  calc(fn.dim(--rounding) + fn.dim(--key-focus --border-offset));
            outline:        fn.color(--key-focus --border) solid fn.dim(--key-focus --border);
            box-shadow:     0 0 0 calc(fn.dim(--key-focus --border) + fn.dim(--key-focus --outline)) fn.color(--key-focus --outline);
            pointer-events: none;
        }

        &:link,
        &:visited,
        &:enabled {
            &:focus-visible {
                &::after {
                    display: block;
                }
            }
        }

        @include iro.bem-elem('label') {
            margin-inline: fn.dim(--pad-i-label);
        }
    
        @include iro.bem-modifier('block') {
            display: block;
        }
    
        @include iro.bem-modifier('outline') {
            border-color:     fn.color(--disabled --outline-border);
            background-color: transparent;
        }

        @each $size in $sizes {
            @include iro.bem-modifier($size) {
                padding-block:  fn.dim(--#{$size} --pad-b);
                padding-inline: fn.dim(--#{$size} --pad-i);
                font-size:      fn.dim(--#{$size} --font-size);

                @include iro.bem-elem('label') {
                    margin-inline: fn.dim(--#{$size} --pad-i-label);
                }
            }
        }

        @include static-theme;
    
        @each $theme in $themes {
            @include iro.bem-modifier($theme) {
                @include theme(--#{$theme});
            }
        }
    
        @each $theme in $static-themes {
            @include iro.bem-modifier(static-#{$theme}) {
                @include static-theme(--static-#{$theme});
            }
        }
    
        @include iro.bem-modifier('round') {
            inline-size:    calc(1em * fn.dim(--line-height) + 2 * fn.dim(--pad-b));
            padding-inline: 0;
            border-radius:  100em;
        }
    }
}