@import '_mixins';
@import '_vars';

@mixin panel-icon {
    color: $color-border-dark;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: 400;
    padding: .6rem;
    text-align: center;
    text-decoration: none;

    &:hover,
    &:focus {
        color: darken($color-border-dark, 10%);
        cursor: pointer;
        text-decoration: none;
    }

    &.active {
        color: $color-theme-blue;
    }
}

//
// Panel container to enforce horizontal stacking and scrolling.
//
.panel-container {
    @include fixed($size-navbar-height, 0, 0, $size-sidebar-width);
    @include scrollbars(8px, $color-border-dark);
    overflow-x: auto;
    overflow-y: hidden;
}

//
// Panel element.
//
.panel {
    & {
        background: $color-background;
        border-right: 1px solid $color-border;
        display: flex;
        flex-direction: column;
        height: 100%;
        position: relative;
    }

    // First row of the panel with the header. Fixed height.
    &-header {
        & {
            @include force-height($panel-header);
            background: $panel-light-background;
            padding: $panel-padding;
            position: relative;
        }

        &-row {
            display: flex;
            flex-direction: row;
            margin-bottom: 0;
            margin-top: 1.2rem;
            position: relative;
        }

        &.large {
            @include force-height(8rem);
        }

        .form-inline {
            display: inline-block;
        }
    }

    // Second row of the panel with the content.
    &-main {
        display: flex;
        flex-direction: row;
        flex-grow: 1;
        overflow: hidden;
    }

    // First column of the main row (second row) with the main content.
    &-content {
        // Content area is gray by default to contain scrollable content, e.g. lists.
        & {
            background: $color-background;
            border-top: 1px solid $color-border;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
            overflow-x: hidden;
            overflow-y: auto;
            padding: $panel-padding;
        }

        // White content area, e.g. for history panel.
        &-blank {
            background: $panel-light-background;
            border: 0;
        }

        &-blank-bordered {
            border-top: 1px solid $color-border;
        }

        // Scrolling must be enabled optionally to prevent bugs.
        &-scroll {
            overflow-y: scroll;
        }

        &-scroll-x {
            overflow-y: auto;
        }

        &.grid {
            display: flex;
            padding: 0;
        }

        & .nav-panel {
            & {
                margin-left: -$panel-padding;
                margin-right: -$panel-padding;
            }

            & .nav-link {
                padding-left: $panel-padding;
                padding-right: $panel-padding;
            }
        }
    }

    // Error or alert on top of the panel content.
    &-alert {
        & {
            color: $color-dark-foreground;
            font-size: .9rem;
            font-weight: normal;
            padding: .5 * $panel-padding $panel-padding;
        }

        a {
            & {
                color: $color-dark-foreground !important;
            }

            &,
            &:hover {
                text-decoration: underline;
            }
        }

        &-success {
            background: $color-theme-green-dark;
        }

        &-danger {
            background: $color-theme-error-dark;
        }
    }

    // Second column of the main row (second row) with additional links.
    &-sidebar {
        & {
            @include force-width($panel-sidebar);
            background: $panel-light-background;
            border-left: 1px solid $color-border;
        }

        &.wide {
            @include force-width(16rem);
        }

        & .panel-nav {
            @include force-width($panel-sidebar);
            position: absolute;
        }

        & .panel-link {
            & {
                @include panel-icon;
                border-bottom: 1px solid transparent;
                border-top: 1px solid transparent;
                display: block;
                padding-bottom: .6rem;
                padding-top: .6rem;
                position: relative;
                transition: background-color .3s ease;
            }

            &:hover {
                color: $color-theme-blue-dark;
            }

            &.active {
                & {
                    border-color: $color-border;
                }

                &::before {
                    @include absolute(0, -1px, 0, auto);
                    background: $panel-light-background;
                    color: transparent;
                    content: '';
                    width: 2px;
                }
            }

            &-gray {
                &.active {
                    &::before {
                        background: transparent;
                    }
                }
            }
        }
    }

    // Panel title.
    &-title {
        @include truncate;
        font-size: 1.5rem;
        font-weight: 400;
        line-height: 2rem;
        padding-right: 2rem;
    }

    // Keep some space on the right side for the close icon.
    &-title-row {
        padding-right: $panel-sidebar - $panel-padding;
    }

    // Close button to close the panel.
    &-close {
        @include absolute($panel-padding - .2rem, $panel-padding - .8rem, auto, auto);
        @include panel-icon;
        font-size: 1rem;
        font-weight: 300;
    }
}

//
// Dark panel.
//
.panel-dark {
    & {
        @include box-shadow(2px, 0, 1px, .3);
        background: $color-dark2-background;
        border-right: 1px solid darken($color-dark2-foreground, 15%);
        color: $color-dark2-foreground;
    }

    .panel-content,
    .panel-header {
        background: $color-dark2-background;
        border: 0;
    }

    .panel-content {
        @include scrollbars(8px, darken($color-dark2-foreground, 10%), transparent);
    }

    .panel-close {
        & {
            color: $color-dark2-foreground;
        }

        &:hover {
            color: lighten($color-dark2-foreground, 15%);
        }
    }

    .nav-link {
        transition: color .4s ease;
    }
}

//
// Fixed main sidebar.
//
.sidebar {
    & {
        @include fixed($size-navbar-height, auto, 0, 0);
        @include box-shadow(2px, 0, 1px, .1);
        @include force-width($size-sidebar-width);
        background: $color-dark1-background;
        border-right: 1px solid $color-dark1-border1;
        z-index: 100;
    }

    .nav {
        &-icon {
            font-size: 2rem;
        }

        &-text {
            font-size: .9rem;
        }

        &-link {
            & {
                color: $color-dark1-foreground;
                display: block;
                padding: 1.25rem;
                text-align: center;
                text-decoration: none;
                transition: color .3s ease;
            }

            &:hover,
            &.active {
                color: $color-dark1-focus-foreground;

                .nav-icon {
                    color: $color-theme-blue;
                }
            }

            &.active {
                background: $color-dark1-active-background;
            }
        }
    }

    &-item {
        & {
            @include border-radius;
            display: block;
            font-size: .9rem;
            font-weight: normal;
            margin-bottom: .25rem;
            padding: .25rem 1rem;
        }

        &-remove {
            visibility: hidden;
        }

        &.active {
            font-weight: bold;
        }

        &.active,
        &:hover {
            background: $color-theme-secondary;
        }

        &.inactive {
            background: none;
        }

        &:hover {
            .sidebar-item-remove {
                visibility: visible;
            }
        }
    }
}

a {
    &.sidebar-item {
        cursor: pointer !important;
    }
}