<?php

declare (strict_types=1);
namespace Freefactu_Vendor\BaconQrCode\Renderer;

use Freefactu_Vendor\BaconQrCode\Encoder\QrCode;
use Freefactu_Vendor\BaconQrCode\Exception\InvalidArgumentException;
final class PlainTextRenderer implements RendererInterface
{
    /**
     * UTF-8 full block (U+2588)
     */
    private const FULL_BLOCK = "█";
    /**
     * UTF-8 upper half block (U+2580)
     */
    private const UPPER_HALF_BLOCK = "▀";
    /**
     * UTF-8 lower half block (U+2584)
     */
    private const LOWER_HALF_BLOCK = "▄";
    /**
     * UTF-8 no-break space (U+00A0)
     */
    private const EMPTY_BLOCK = " ";
    public function __construct(private readonly int $margin = 2)
    {
    }
    /**
     * @throws InvalidArgumentException if matrix width doesn't match height
     */
    public function render(QrCode $qrCode): string
    {
        $matrix = $qrCode->getMatrix();
        $matrixSize = $matrix->getWidth();
        if ($matrixSize !== $matrix->getHeight()) {
            throw new InvalidArgumentException('Matrix must have the same width and height');
        }
        $rows = $matrix->getArray()->toArray();
        if (0 !== $matrixSize % 2) {
            $rows[] = array_fill(0, $matrixSize, 0);
        }
        $horizontalMargin = str_repeat(self::EMPTY_BLOCK, $this->margin);
        $result = str_repeat("\n", (int) ceil($this->margin / 2));
        for ($i = 0; $i < $matrixSize; $i += 2) {
            $result .= $horizontalMargin;
            $upperRow = $rows[$i];
            $lowerRow = $rows[$i + 1];
            for ($j = 0; $j < $matrixSize; ++$j) {
                $upperBit = $upperRow[$j];
                $lowerBit = $lowerRow[$j];
                if ($upperBit) {
                    $result .= $lowerBit ? self::FULL_BLOCK : self::UPPER_HALF_BLOCK;
                } else {
                    $result .= $lowerBit ? self::LOWER_HALF_BLOCK : self::EMPTY_BLOCK;
                }
            }
            $result .= $horizontalMargin . "\n";
        }
        $result .= str_repeat("\n", (int) ceil($this->margin / 2));
        return $result;
    }
}
