<?php

namespace PhpOffice\PhpSpreadsheet\Reader\Xml\Style;

use PhpOffice\PhpSpreadsheet\Style\Font as FontUnderline;
use SimpleXMLElement;

class Font extends StyleBase
{
    protected const UNDERLINE_STYLES = [
        FontUnderline::UNDERLINE_NONE,
        FontUnderline::UNDERLINE_DOUBLE,
        FontUnderline::UNDERLINE_DOUBLEACCOUNTING,
        FontUnderline::UNDERLINE_SINGLE,
        FontUnderline::UNDERLINE_SINGLEACCOUNTING,
    ];

    /**
     * @param mixed[][] $style
     *
     * @return mixed[][]
     */
    protected function parseUnderline(array $style, string $styleAttributeValue): array
    {
        if (self::identifyFixedStyleValue(self::UNDERLINE_STYLES, $styleAttributeValue)) {
            $style['font']['underline'] = $styleAttributeValue;
        }

        return $style;
    }

    /**
     * @param mixed[][] $style
     *
     * @return mixed[][]
     */
    protected function parseVerticalAlign(array $style, string $styleAttributeValue): array
    {
        if ($styleAttributeValue == 'Superscript') {
            $style['font']['superscript'] = true;
        }
        if ($styleAttributeValue == 'Subscript') {
            $style['font']['subscript'] = true;
        }

        return $style;
    }

    /** @return mixed[] */
    public function parseStyle(SimpleXMLElement $styleAttributes): array
    {
        $style = [];

        foreach ($styleAttributes as $styleAttributeKey => $styleAttributeValue) {
            $styleAttributeValue = (string) $styleAttributeValue;
            switch ($styleAttributeKey) {
                case 'FontName':
                    $style['font']['name'] = $styleAttributeValue;

                    break;
                case 'Size':
                    $style['font']['size'] = $styleAttributeValue;

                    break;
                case 'Color':
                    /** @var string[][][] $style */
                    $style['font']['color']['rgb'] = substr($styleAttributeValue, 1);

                    break;
                case 'Bold':
                    $style['font']['bold'] = $styleAttributeValue === '1';

                    break;
                case 'Italic':
                    $style['font']['italic'] = $styleAttributeValue === '1';

                    break;
                case 'Underline':
                    $style = $this->parseUnderline($style, $styleAttributeValue);

                    break;
                case 'VerticalAlign':
                    $style = $this->parseVerticalAlign($style, $styleAttributeValue);

                    break;
            }
        }

        return $style;
    }
}
