<?php

// SPDX-FileCopyrightText: 2018 Icinga GmbH <https://icinga.com>
// SPDX-License-Identifier: GPL-3.0-or-later

namespace Icinga\Chart\Primitive;

use DOMDocument;
use DOMElement;
use DOMText;
use Icinga\Chart\Render\RenderContext;
use Icinga\Chart\Format;
use ipl\Html\HtmlDocument;

/**
 *  Wrapper for the SVG text element
 */
class Text extends Styleable implements Drawable
{
    /**
     * Align the text to end at the x and y position
     */
    const ALIGN_END     = 'end';

    /**
     * Align the text to start at the x and y position
     */
    const ALIGN_START   = 'start';

    /**
     * Align the text to be centered at the x and y position
     */
    const ALIGN_MIDDLE  = 'middle';

    /**
     * The x position of the Text
     *
     * @var int
     */
    private $x;

    /**
     * The y position of the Text
     *
     * @var int
     */
    private $y;

    /**
     * The text content
     *
     * @var string
     */
    private $text;

    /**
     * The size of the font
     *
     * @var string
     */
    private $fontSize = '1.5em';

    /**
     * The weight of the font
     *
     * @var string
     */
    private $fontWeight = 'normal';

    /**
     * The default fill color
     *
     * @var string
     */
    public $fill = '#000';

    /**
     * The alignment of the text
     *
     * @var string
     */
    private $alignment = self::ALIGN_START;

    /**
     * Set the font-stretch property of the text
     */
    private $fontStretch = 'semi-condensed';

    /**
     * Construct a new text drawable
     *
     * @param int $x            The x position of the text
     * @param int $y            The y position of the text
     * @param string $text      The text this component should contain
     * @param string $fontSize  The font size of the text
     */
    public function __construct($x, $y, $text, $fontSize = '1.5em')
    {
        $this->x = $x;
        $this->y = $y;
        $this->text = $text;
        $this->fontSize = $fontSize;

        $this->setAdditionalStyle([
            'font-size'    => $this->fontSize,
            'font-family'  => 'Ubuntu, Calibri, Trebuchet MS, Helvetica, Verdana, sans-serif',
            'font-weight'  => $this->fontWeight,
            'font-stretch' => $this->fontStretch,
            'font-style'   => 'normal',
            'text-anchor'  => $this->alignment
        ]);
    }

    /**
     * Set the font size of the svg text element
     *
     * @param   string $size    The font size including a unit
     *
     * @return  $this            Fluid interface
     */
    public function setFontSize($size)
    {
        $this->fontSize = $size;
        return $this;
    }

    /**
     * Set the text alignment with one of the ALIGN_* constants
     *
     * @param   String $align   Value how to align
     *
     * @return  $this            Fluid interface
     */
    public function setAlignment($align)
    {
        $this->alignment = $align;
        return $this;
    }

    /**
     * Set the weight of the current font
     *
     * @param string $weight    The weight of the string
     *
     * @return $this             Fluid interface
     */
    public function setFontWeight($weight)
    {
        $this->fontWeight = $weight;
        return $this;
    }

    /**
     * Create the SVG representation from this Drawable
     *
     * @param   RenderContext $ctx  The context to use for rendering
     *
     * @return  DOMElement          The SVG Element
     */
    public function toSvg(RenderContext $ctx)
    {
        list($x, $y) = $ctx->toAbsolute($this->x, $this->y);
        $text = $ctx->getDocument()->createElement('text');
        $text->setAttribute('x', Format::formatSVGNumber($x - 15));

        $id = $this->id ?? uniqid('text-');
        $text->setAttribute('id', $id);
        $this->setId($id);

        $text->setAttribute('y', Format::formatSVGNumber($y));
        $text->appendChild(new DOMText($this->text));

        $style = new DOMDocument();
        $style->loadHTML($this->getStyle());

        $text->appendChild(
            $text->ownerDocument->importNode(
                $style->getElementsByTagName('style')->item(0),
                true
            )
        );

        return $text;
    }
}