<?php
/**
 * Classes to create relation schema in SVG format.
 */

declare(strict_types=1);

namespace PhpMyAdmin\Plugins\Schema\Svg;

use PhpMyAdmin\Core;
use PhpMyAdmin\ResponseRenderer;
use XMLWriter;

use function intval;
use function is_int;
use function sprintf;
use function strlen;

/**
 * This Class inherits the XMLwriter class and
 * helps in developing structure of SVG Schema Export
 *
 * @see     https://www.php.net/manual/en/book.xmlwriter.php
 */
class Svg extends XMLWriter
{
    /** @var string */
    public $title = '';

    /** @var string */
    public $author = 'phpMyAdmin';

    /** @var string */
    public $font = 'Arial';

    /** @var int */
    public $fontSize = 12;

    /**
     * Upon instantiation This starts writing the RelationStatsSvg XML document
     *
     * @see XMLWriter::openMemory()
     * @see XMLWriter::setIndent()
     * @see XMLWriter::startDocument()
     */
    public function __construct()
    {
        $this->openMemory();
        /*
         * Set indenting using three spaces,
         * so output is formatted
         */

        $this->setIndent(true);
        $this->setIndentString('   ');
        /*
         * Create the XML document
         */

        $this->startDocument('1.0', 'UTF-8');
        $this->startDtd('svg', '-//W3C//DTD SVG 1.1//EN', 'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd');
        $this->endDtd();
    }

    /**
     * Set document title
     *
     * @param string $value sets the title text
     */
    public function setTitle($value): void
    {
        $this->title = $value;
    }

    /**
     * Set document author
     *
     * @param string $value sets the author
     */
    public function setAuthor($value): void
    {
        $this->author = $value;
    }

    /**
     * Set document font
     *
     * @param string $value sets the font e.g Arial, Sans-serif etc
     */
    public function setFont(string $value): void
    {
        $this->font = $value;
    }

    /**
     * Get document font
     *
     * @return string returns the font name
     */
    public function getFont(): string
    {
        return $this->font;
    }

    /**
     * Set document font size
     *
     * @param int $value sets the font size in pixels
     */
    public function setFontSize(int $value): void
    {
        $this->fontSize = $value;
    }

    /**
     * Get document font size
     *
     * @return int returns the font size
     */
    public function getFontSize(): int
    {
        return $this->fontSize;
    }

    /**
     * Starts RelationStatsSvg Document
     *
     * svg document starts by first initializing svg tag
     * which contains all the attributes and namespace that needed
     * to define the svg document
     *
     * @see XMLWriter::startElement()
     * @see XMLWriter::writeAttribute()
     *
     * @param int $width  total width of the RelationStatsSvg document
     * @param int $height total height of the RelationStatsSvg document
     * @param int $x      min-x of the view box
     * @param int $y      min-y of the view box
     */
    public function startSvgDoc($width, $height, $x = 0, $y = 0): void
    {
        $this->startElement('svg');

        if (! is_int($width)) {
            $width = intval($width);
        }

        if (! is_int($height)) {
            $height = intval($height);
        }

        if ($x != 0 || $y != 0) {
            $this->writeAttribute('viewBox', sprintf('%d %d %d %d', $x, $y, $width, $height));
        }

        $this->writeAttribute('width', ($width - $x) . 'px');
        $this->writeAttribute('height', ($height - $y) . 'px');
        $this->writeAttribute('xmlns', 'http://www.w3.org/2000/svg');
        $this->writeAttribute('version', '1.1');
    }

    /**
     * Ends RelationStatsSvg Document
     *
     * @see XMLWriter::endElement()
     * @see XMLWriter::endDocument()
     */
    public function endSvgDoc(): void
    {
        $this->endElement();
        $this->endDocument();
    }

    /**
     * output RelationStatsSvg Document
     *
     * svg document prompted to the user for download
     * RelationStatsSvg document saved in .svg extension and can be
     * easily changeable by using any svg IDE
     *
     * @see XMLWriter::startElement()
     * @see XMLWriter::writeAttribute()
     *
     * @param string $fileName file name
     */
    public function showOutput($fileName): void
    {
        //ob_get_clean();
        $output = $this->flush();
        ResponseRenderer::getInstance()->disable();
        Core::downloadHeader(
            $fileName,
            'image/svg+xml',
            strlen($output)
        );
        print $output;
    }

    /**
     * Draws RelationStatsSvg elements
     *
     * SVG has some predefined shape elements like rectangle & text
     * and other elements who have x,y co-ordinates are drawn.
     * specify their width and height and can give styles too.
     *
     * @see XMLWriter::startElement()
     * @see XMLWriter::writeAttribute()
     * @see XMLWriter::text()
     * @see XMLWriter::endElement()
     *
     * @param string      $name   RelationStatsSvg element name
     * @param int         $x      The x attr defines the left position of the element
     *                            (e.g. x="0" places the element 0 pixels from the
     *                            left of the browser window)
     * @param int         $y      The y attribute defines the top position of the
     *                            element (e.g. y="0" places the element 0 pixels
     *                            from the top of the browser window)
     * @param int|string  $width  The width attribute defines the width the element
     * @param int|string  $height The height attribute defines the height the element
     * @param string|null $text   The text attribute defines the text the element
     * @param string      $styles The style attribute defines the style the element
     *                            styles can be defined like CSS styles
     */
    public function printElement(
        $name,
        $x,
        $y,
        $width = '',
        $height = '',
        ?string $text = '',
        $styles = ''
    ): void {
        $this->startElement($name);
        $this->writeAttribute('width', (string) $width);
        $this->writeAttribute('height', (string) $height);
        $this->writeAttribute('x', (string) $x);
        $this->writeAttribute('y', (string) $y);
        $this->writeAttribute('style', (string) $styles);
        if (isset($text)) {
            $this->writeAttribute('font-family', (string) $this->font);
            $this->writeAttribute('font-size', $this->fontSize . 'px');
            $this->text($text);
        }

        $this->endElement();
    }

    /**
     * Draws RelationStatsSvg Line element
     *
     * RelationStatsSvg line element is drawn for connecting the tables.
     * arrows are also drawn by specify its start and ending
     * co-ordinates
     *
     * @see XMLWriter::startElement()
     * @see XMLWriter::writeAttribute()
     * @see XMLWriter::endElement()
     *
     * @param string $name   RelationStatsSvg element name i.e line
     * @param int    $x1     Defines the start of the line on the x-axis
     * @param int    $y1     Defines the start of the line on the y-axis
     * @param int    $x2     Defines the end of the line on the x-axis
     * @param int    $y2     Defines the end of the line on the y-axis
     * @param string $styles The style attribute defines the style the element
     *                       styles can be defined like CSS styles
     */
    public function printElementLine($name, $x1, $y1, $x2, $y2, $styles): void
    {
        $this->startElement($name);
        $this->writeAttribute('x1', (string) $x1);
        $this->writeAttribute('y1', (string) $y1);
        $this->writeAttribute('x2', (string) $x2);
        $this->writeAttribute('y2', (string) $y2);
        $this->writeAttribute('style', (string) $styles);
        $this->endElement();
    }
}