<?php

/**
 * PHPExcel_Writer_Excel5_Font
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel5
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
class PHPExcel_Writer_Excel5_Font
{
    /**
     * Color index
     *
     * @var int
     */
    private $colorIndex;

    /**
     * Font
     *
     * @var PHPExcel_Style_Font
     */
    private $font;

    /**
     * Constructor
     *
     * @param PHPExcel_Style_Font $font
     */
    public function __construct(PHPExcel_Style_Font $font = null)
    {
        $this->colorIndex = 0x7FFF;
        $this->font       = $font;
    }

    /**
     * Set the color index
     *
     * @param int $colorIndex
     */
    public function setColorIndex($colorIndex)
    {
        $this->colorIndex = $colorIndex;
    }

    /**
     * Get font record data
     *
     * @return string
     */
    public function writeFont()
    {
        $font_outline = 0;
        $font_shadow  = 0;

        $icv = $this->colorIndex; // Index to color palette

        if ($this->font->getSuperScript()) {
            $sss = 1;
        } elseif ($this->font->getSubScript()) {
            $sss = 2;
        } else {
            $sss = 0;
        }
        $bFamily  = 0; // Font family
        $bCharSet = PHPExcel_Shared_Font::getCharsetFromFontName($this->font->getName()); // Character set

        $record   = 0x31;        // Record identifier
        $reserved = 0x00;    // Reserved
        $grbit    = 0x00;        // Font attributes

        if ($this->font->getItalic()) {
            $grbit |= 0x02;
        }

        if ($this->font->getStrikethrough()) {
            $grbit |= 0x08;
        }

        if ($font_outline) {
            $grbit |= 0x10;
        }

        if ($font_shadow) {
            $grbit |= 0x20;
        }

        $data = pack(
            'vvvvvCCCC',
            // Fontsize (in twips)
            $this->font->getSize() * 20,
            $grbit,
            // Colour
            $icv,
            // Font weight
            self::mapBold($this->font->getBold()),
            // Superscript/Subscript
            $sss,
            self::mapUnderline($this->font->getUnderline()),
            $bFamily,
            $bCharSet,
            $reserved
        );
        $data .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeShort($this->font->getName());

        $length = strlen($data);
        $header = pack('vv', $record, $length);

        return($header . $data);
    }

    /**
     * Map to BIFF5-BIFF8 codes for bold
     *
     * @param bool $bold
     * @return int
     */
    private static function mapBold($bold)
    {
        if ($bold) {
            return 0x2BC;  //  700 = Bold font weight
        }

        return 0x190;      //  400 = Normal font weight
    }

    /**
     * Map of BIFF2-BIFF8 codes for underline styles
     * @static    array of int
     */
    private static $mapUnderline = [
        PHPExcel_Style_Font::UNDERLINE_NONE             => 0x00,
        PHPExcel_Style_Font::UNDERLINE_SINGLE           => 0x01,
        PHPExcel_Style_Font::UNDERLINE_DOUBLE           => 0x02,
        PHPExcel_Style_Font::UNDERLINE_SINGLEACCOUNTING => 0x21,
        PHPExcel_Style_Font::UNDERLINE_DOUBLEACCOUNTING => 0x22,
    ];

    /**
     * Map underline
     *
     * @param string
     * @return int
     */
    private static function mapUnderline($underline)
    {
        if (isset(self::$mapUnderline[$underline])) {
            return self::$mapUnderline[$underline];
        }

        return 0x00;
    }
}
