<?php

namespace Mpdf\Conversion;

use Mpdf\Utils\UtfString;

class DecToHebrew
{

	public function convert($in, $reverse = false)
	{
		// reverse is used when called from Lists, as these do not pass through bidi-algorithm
		$i = intval($in); // I initially be the counter value
		$s = ''; // S initially be the empty string

		// and glyph list initially be the list of additive tuples.
		$additive_nums = [400, 300, 200, 100, 90, 80, 70, 60, 50, 40, 30, 20, 19, 18, 17, 16, 15, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
		$additive_glyphs = [0x05EA, 0x05E9, 0x05E8, 0x05E7, 0x05E6, 0x05E4, 0x05E2, 0x05E1, 0x05E0, 0x05DE, 0x05DC, 0x05DB,
			[0x05D9, 0x05D8], [0x05D9, 0x05D7], [0x05D9, 0x05D6], [0x05D8, 0x05D6], [0x05D8, 0x05D5], 0x05D9,
			0x05D8, 0x05D7, 0x05D6, 0x05D5, 0x05D4, 0x05D3, 0x05D2, 0x05D1, 0x05D0];

		// NB This system manually specifies the values for 19-15 to force the correct display of 15 and 16, which are commonly
		// rewritten to avoid a close resemblance to the Tetragrammaton.
		// This function only works up to 1,000
		if ($i > 999) {
			return $in;
		}

		// return as initial numeric string
		// If I is initially 0, and there is an additive tuple with a weight of 0, append that tuple's counter glyph to S and return S.
		if ($i == 0) {
			return '0';
		}

		// Otherwise, while I is greater than 0 and there are elements left in the glyph list:
		for ($t = 0; $t < count($additive_nums); $t++) {
			// Pop the first additive tuple from the glyph list. This is the current tuple.
			$ct = $additive_nums[$t];
			// Append the current tuple's counter glyph to S x floor( I / current tuple's weight ) times (this may be 0).
			$n = floor($i / $ct);
			for ($j = 0; $j < $n; $j++) {
				if (is_array($additive_glyphs[$t])) {
					foreach ($additive_glyphs[$t] as $ag) {
						if ($reverse) {
							$s = UtfString::code2utf($ag) . $s;
						} else {
							$s .= UtfString::code2utf($ag);
						}
					}
				} else {
					if ($reverse) {
						$s = UtfString::code2utf($additive_glyphs[$t]) . $s;
					} else {
						$s .= UtfString::code2utf($additive_glyphs[$t]);
					}
				}
				$i -= ($ct * $n);
			}
			if ($i == 0) {
				return $s;
			}
		}

		return $in; // return as initial string
	}

}
