@use 'sass:map';
@use 'sass:meta';
@use 'sass:string';
@use 'iro-sass/src/iro-sass' as iro;
@use '../props';

@forward 'lightbox.vars';
@use 'lightbox.vars' as vars;

@mixin styles {
    @include props.materialize(meta.module-variables('vars'));

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

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

        @include iro.bem-elem('img') {
            box-sizing:      border-box;
            display:         none;
            grid-area:       content;
            place-self:      center;
            max-inline-size: 100%;
            max-block-size:  100%;
            padding:         props.get(vars.$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') {
            display:            flex;
            grid-area:          thumbnails;
            gap:                props.get(vars.$thumbnail--spacing);
            padding:            props.get(vars.$pad);
            margin-block-start: calc(-1 * props.get(vars.$pad));
            overflow:           auto;
        }

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

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

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

            @include iro.bem-is('selected') {
                $focus-border-offset: calc(-1 * props.get(vars.$thumbnail--selected--border-width));

                margin:        $focus-border-offset;
                border:        props.get(vars.$thumbnail--selected--border-width) solid props.get(vars.$thumbnail--selected--border-color);
                border-radius: calc(props.get(vars.$thumbnail--rounding) - $focus-border-offset);
                outline:       none;
                opacity:       1;
            }

            &:focus-visible {
                $focus-border-offset: calc(-1 * props.get(vars.$thumbnail--key-focus--border-offset));

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

        @include iro.bem-elem('thumbnail-img') {
            position:           absolute;
            inset-block-start:  0;
            inset-inline-start: 0;
            display:            block;
            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 * props.get(vars.$pad));
            margin-inline:      auto calc(-.5 * props.get(vars.$pad));
            font-size:          props.get(vars.$close-button--font-size);
        }

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

            &::before {
                position:           absolute;
                inset-block-start:  50%;
                display:            block;
                inline-size:        props.get(vars.$nav-button--inline-size);
                block-size:         props.get(vars.$nav-button--block-size);
                content:            '';
                transform:          translateY(-50%);
            }

            @include iro.bem-modifier('prev') {
                grid-area:     prev;
                margin-inline: calc(.5 * props.get(vars.$pad)) calc(-1 * props.get(vars.$pad));

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

                &::before {
                    inset-inline-end: 0;
                }
            }
        }

        @each $theme in map.keys(props.get(vars.$static-themes)) {
            @include iro.bem-modifier(string.slice($theme, 3)) {
                color: props.get(vars.$static-themes, $theme, --text);

                @include iro.bem-elem('thumbnail') {
                    outline-color: props.get(vars.$static-themes, $theme, --thumbnail, --border);

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

                    &:focus-visible {
                        border-color:  transparent;
                        outline-color: props.get(vars.$static-themes, $theme, --thumbnail, --key-focus, --border);
                        box-shadow: 
                            0
                            0
                            0
                            calc(props.get(vars.$thumbnail--key-focus--outline-width) + props.get(vars.$thumbnail--key-focus--border-width))
                            props.get(vars.$static-themes, $theme, --thumbnail, --key-focus, --outline);
                    }
                }
            }
        }
    }
}