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

@use 'action-button';

$static-themes: 'black' 'white' !default;

@include iro.props-namespace('lightbox') {
    @include iro.props-store((
        --dims: (
            --pad: fn.global-dim(--size --150),

            --thumbnail: (
                --size:      fn.global-dim(--size --700),
                --rounding:  fn.global-dim(--rounding),
                --spacing:   fn.global-dim(--size --100),
                --border:    fn.global-dim(--border --thin),
                
                --selected: (
                    --border: fn.global-dim(--border --medium),
                ),

                --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),
                ),
            ),

            --close-button: (
                --font-size: fn.global-dim(--font-size --200),
            ),

            --nav-button: (
                --width:     fn.global-dim(--size --2000),
                --height:    fn.global-dim(--size --3800),
                --font-size: fn.global-dim(--font-size --200),
            ),
        ),
        --colors: (
            --thumbnail: (
                --border: fn.global-color(--border-strong),
                
                --hover: (
                    --border: fn.global-color(--text-mute-more),
                ),
                
                --selected: (
                    --border: fn.global-color(--heading),
                ),

                --key-focus: (
                    --border:  fn.global-color(--focus --border),
                    --outline: fn.global-color(--focus --outline),
                ),
            ),
        ),
    ));

    @each $theme in $static-themes {
        @include iro.props-store((
            --colors: (
                --static-#{$theme}: (
                    --text: fn.global-color(--white-transparent --800),
                    --thumbnail: (
                        --border: fn.global-color(--white-transparent --400),
                
                        --hover: (
                            --border: fn.global-color(--white-transparent --500),
                        ),
                        
                        --selected: (
                            --border: fn.global-color(--white-transparent --900),
                        ),

                        --key-focus: (
                            --border:  fn.global-color(--#{$theme}-transparent --900),
                            --outline: fn.global-color(--#{$theme}-transparent --300),
                        ),
                    ),
                )
            )
        ));
    }

    @include iro.props-store((
        --dims: (
            --thumbnail: (
                --size: fn.global-dim(--size --600),
            ),
            --nav-button: (
                --width:  fn.global-dim(--size --2500),
                --height: fn.global-dim(--size --2500),
            ),
        ),
    ), 'md');

    @include iro.bem-object(iro.props-namespace()) {
        display:               grid;
        grid-template-rows:    auto minmax(0, 1fr) auto auto;
        grid-template-columns: auto minmax(0, 1fr) auto;
        grid-template-areas:
            'header     header     header'
            'prev       content    next'
            'thumbnails thumbnails thumbnails'
            'footer     footer     footer';
        box-sizing:            border-box;
        block-size:            100%;
        min-block-size:        0;

        @include iro.bem-elem('header') {
            grid-area:           header;
            display:             flex;
            align-items:         flex-start;
            padding-block-start: fn.dim(--pad);
            padding-inline:      fn.dim(--pad);
        }

        @include iro.bem-elem('img') {
            display:         none;
            box-sizing:      border-box;
            grid-area:       content;
            max-inline-size: 100%;
            max-block-size:  100%;
            place-self:      center;
            padding:         fn.dim(--pad);

            @include iro.bem-sibling-elem('img') {
                @include iro.bem-modifier('default') {
                    display: block;

                    @include iro.bem-next-elem('nav-btn') {
                        display: block;
    
                        @include iro.bem-next-elem('nav-btn') {
                            display: block;
                        }
                    }
                }
            }

            @include iro.bem-multi('&:target', 'is' 'visible') {
                display: block;

                @include iro.bem-next-elem('nav-btn') {
                    display: block;

                    @include iro.bem-next-elem('nav-btn') {
                        display: block;
                    }
                }

                @include iro.bem-sibling-elem('img') {
                    @include iro.bem-modifier('default') {
                        display: none;

                        @include iro.bem-next-elem('nav-btn') {
                            display: none;
        
                            @include iro.bem-next-elem('nav-btn') {
                                display: none;
                            }
                        }
                    }
                }
            }
        }

        @include iro.bem-elem('thumbnails') {
            grid-area:          thumbnails;
            display:            flex;
            gap:                fn.dim(--thumbnail --spacing);
            padding:            fn.dim(--pad);
            margin-block-start: calc(-1 * fn.dim(--pad));
            overflow:           auto;
        }

        @include iro.bem-elem('footer') {
            grid-area:      footer;
            display:        flex;
            align-items:    flex-start;
            padding-block:  0 fn.dim(--pad);
            padding-inline: fn.dim(--pad);
        }

        @include iro.bem-elem('thumbnail') {
            position:       relative;
            flex:           0 0 auto;
            inline-size:    fn.dim(--thumbnail --size);
            block-size:     fn.dim(--thumbnail --size);
            overflow:       hidden;
            border-radius:  fn.dim(--thumbnail --rounding);
            outline:        fn.dim(--thumbnail --border) solid fn.color(--thumbnail --border);
            outline-offset: calc(-1 * fn.dim(--thumbnail --border));
            opacity:       .75;

            &:hover,
            &:active,
            &:focus-visible {
                outline-color: fn.color(--thumbnail --hover --border);
                opacity:       1;
            }

            @include iro.bem-is('selected') {
                $focus-border-offset: calc(-1 * fn.dim(--thumbnail --selected --border));

                margin:        $focus-border-offset;
                border:        fn.dim(--thumbnail --selected --border) solid fn.color(--thumbnail --selected --border);
                border-radius: calc(fn.dim(--thumbnail --rounding) - $focus-border-offset);
                outline:       none;
                opacity:       1;
            }

            &:focus-visible {
                $focus-border-offset: calc(-1 * fn.dim(--thumbnail --key-focus --border-offset));

                margin:         $focus-border-offset;
                border:         fn.dim(--thumbnail --key-focus --border-offset) solid transparent;
                border-radius:  calc(fn.dim(--thumbnail --rounding) - $focus-border-offset);
                outline:        fn.dim(--thumbnail --key-focus --border) solid fn.color(--thumbnail --key-focus --border);
                outline-offset: 0;
                box-shadow:     0 0 0 calc(fn.dim(--thumbnail --key-focus --outline) + fn.dim(--thumbnail --key-focus --border)) fn.color(--thumbnail --key-focus --outline);
            }
        }

        @include iro.bem-elem('thumbnail-img') {
            display:            block;
            position:           absolute;
            inset-block-start:  0;
            inset-inline-start: 0;
            inline-size:        100%;
            block-size:         100%;
            object-fit:         cover;
            object-position:    center center;
        }

        @include iro.bem-elem('thumbnail-icon') {
            position:           absolute;
            inset-block-start:  50%;
            inset-inline-start: 50%;
            transform:          translate(-50%, -50%);
        }

        @include iro.bem-elem('close-btn') {
            flex:               0 0 auto;
            margin-block-start: calc(-.5 * fn.dim(--pad));
            margin-inline:      auto calc(-.5 * fn.dim(--pad));
            font-size:          fn.dim(--close-button --font-size);
        }

        @include iro.bem-elem('nav-btn') {
            display:    none;
            position:   relative;
            align-self: center;
            overflow:   visible;
            font-size:  fn.dim(--nav-button --font-size);

            &::before {
                content:            '';
                display:            block;
                position:           absolute;
                inset-block-start:  50%;
                inline-size:        fn.dim(--nav-button --width);
                block-size:         fn.dim(--nav-button --height);
                transform:          translateY(-50%);
            }

            @include iro.bem-modifier('prev') {
                grid-area:     prev;
                margin-inline: calc(.5 * fn.dim(--pad)) calc(-1 * fn.dim(--pad));

                &::before {
                    inset-inline-start: 0;
                }
            }
    
            @include iro.bem-modifier('next') {
                grid-area:     next;
                margin-inline: calc(-1 * fn.dim(--pad)) calc(.5 * fn.dim(--pad));

                &::before {
                    inset-inline-end: 0;
                }
            }
        }
    
        @each $theme in $static-themes {
            @include iro.bem-modifier(static-#{$theme}) {
                color: fn.color(--static-#{$theme} --text);

                @include iro.bem-elem('thumbnail') {
                    outline-color: fn.color(--static-#{$theme} --thumbnail --border);

                    &:hover,
                    &:active,
                    &:focus-visible {
                        outline-color: fn.color(--static-#{$theme} --thumbnail --hover --border);
                    }
        
                    @include iro.bem-is('selected') {
                        border-color: fn.color(--static-#{$theme} --thumbnail --selected --border);
                    }

                    &:focus-visible {
                        border-color:  transparent;
                        outline-color: fn.color(--static-#{$theme} --thumbnail --key-focus --border);
                        box-shadow:    0 0 0 calc(fn.dim(--thumbnail --key-focus --outline) + fn.dim(--thumbnail --key-focus --border)) fn.color(--static-#{$theme} --thumbnail --key-focus --outline);
                    }
                }
            }
        }
    }
}