/**
 * This file is part of HTML2print.
 *
 * HTML2print is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * HTML2print is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with HTML2print.  If not, see <http://www.gnu.org/licenses/>.
 */


/**
 * Computation
 */


/* computes the edge size of the paper, which is the sum of the bleed and the
 * crop sizes */
$edge: $crop-size + $bleed;

/* Computes the size of the paper sheet */
$paper-width: $page-width + ( $edge * 2 );
$paper-height: $page-height + ( $edge * 2 );

/**
 * DEFINITION OF THE PAPER SHEET
 */

/**
 * The $page CSS at-rule is used to define some properties of printed
 * documents. We make it the size of the elements with the .paper class and
 * remove any margins so they don't add up with margins specifed in elements
 * with the .page class (or it's children, like .header, .body and .footer)
 *
 * We add 2pt to circumvent a rounding number bug in some browsers that make
 * them include extra pages or shifts.
 */
@page {
    size: $paper-width $paper-height + 2pt;
    margin: 0;
}


/**
 * CANVAS
 */

@media all {
    body {
        margin: 0;

        /* Activate opentype features and kernings */
        -webkit-font-feature-settings: "liga", "dlig", "clig", "kern";
        text-rendering: optimizeLegibility;
    }

    .paper {
        width: $paper-width;
        height: $paper-height;
        box-sizing: border-box;

        /* defines a named counter and increments it every page, so we can use
         * it to compute the page number */
        counter-increment: folio;

        /* makes sure that pages aren't cut because of pootential unprecise unit
         * conversion at printing time */
        page-break-inside: avoid;
        page-break-after: always;

        /* clips the content if it goes out of the page, so it doesn't increase
         * the format */
        overflow: hidden;

        /* Crop marks */
        padding: $edge;
        position: relative;

        /* Crop marks */
        background-image:
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%),
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%),
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%),
            -webkit-linear-gradient(90deg, black 0, black 100%),
            -webkit-linear-gradient(0deg, black 0, black 100%)
        ;
        background-size:
            $crop-size 1px,
            1px $crop-size,
            $crop-size 1px,
            1px $crop-size,
            $crop-size 1px,
            1px $crop-size,
            $crop-size 1px,
            1px $crop-size
        ;
        background-position:
            left $edge,
            $edge top,
            right $edge,
            ($paper-width - $edge) top,
            right ($paper-height - $edge),
            ($paper-width - $edge) bottom,
            left ($paper-height - $edge),
            $edge bottom
        ;
        background-repeat: no-repeat;
    }

    .page {
        /* defines the page size */
        width: $page-width;
        height: $page-height;

        /* allows for absolutely positioned elements as settings the position
         * property to relative as the side effect of making this elements
         * top-left corner the reference point */
        /*position: relative;*/
        position: absolute; // FIXME: test it for printing issues
    }

    // TODO: changer le format du papier en spread pour pouvoir imprimer en planche
    .spread .paper { float: left; }

    .spread:not(.facing) .paper:nth-child(odd) { margin-left: -$edge; }
    .spread:not(.facing) .paper:nth-child(even) { margin-right: -$edge; }
    .spread:not(.facing) .paper:first-child { margin-left: $page-width; }

    .spread.facing .paper:nth-child(even) { margin-right: initial; margin-left: -$edge; }
    .spread.facing .paper:nth-child(odd) { margin-left: initial; margin-right: -$edge; }
    .spread.facing .paper:first-child { margin-left: 0; }
}

@media screen {
    /* defines the background color of the workspace */
    /* UI */
    body { background-color: #F0F0F0; }

    #pages {
        width: $paper-width;
        height: $paper-height;

        margin-left: auto;
        margin-right: auto;
    }
    /* FIXME: allows for printing spreads as well */
    .spread #pages {
        width: $paper-width * 2;
        height: $paper-height * 2;
    }
    .paper {
        /* centrer la page à l'écran */
        /* UI */
        background-color: white;
        /* UI */
        margin-top: 1em;
        /* UI */
        margin-bottom: 1em;
    }
    /* UI */
    .normal .page { outline: 1px dotted lightsalmon; }
    /* UI */
    .preview .paper { background: transparent; }
    /* UI */
    .preview .page {
        outline: 1px solid lightgray;
        background-color: white;
        overflow: hidden;
    }
}


@media print {
    html { width: $paper-width; }
    body {
        /* Allows for background colors printing */
        background-color: transparent;
        -webkit-print-color-adjust: exact;
                print-color-adjust: exact;
    }
}

/**
 * Helpers
 */

.region-break {
    /* Apply this class to an element to put it on a new region.
     * Hint:
     * You can also use an empty <div class="page-break"></div>
     * if you want to put manual page breaks without attaching it to an HTML element
     */
    -webkit-region-break-before: always;
}