<?php

$input = file_get_contents('input.txt');

const TRANSPARENT = 2;
const WHITE = 1;
const BLACK = 0;
const WIDTH = 25;
const HEIGHT = 6;
$area = WIDTH * HEIGHT;

function flatten(array $array) {
    $return = [];

    array_walk_recursive($array, static function($a) use (&$return) { $return[] = $a; });

    return implode('', $return);
}

$layers = array_map(static function($layer) {
    return str_split($layer, WIDTH);
}, str_split($input, $area));

$final_image = array_fill(0, HEIGHT, []);
$final_image = array_map(static function() {
    return array_fill(0, WIDTH, TRANSPARENT);
}, $final_image);

foreach ($layers as $layer) {
    foreach ($layer as $row => $line) {
        $numbers = str_split($line);
        foreach ($numbers as $col => $number) {
            if ($final_image[$row][$col] == TRANSPARENT) {
                $final_image[$row][$col] = $number;
            }
        }
    }
}

$image = new Imagick();

$white = new \ImagickPixel('#FFFFFF');
$black = new \ImagickPixel('#000000');

$image->newImage(WIDTH * 10, HEIGHT * 10, 'none');
$image->setImageFormat('png');

$draw = new \ImagickDraw();

foreach ($final_image as $j => $row) {
    foreach ($row as $i => $cell) {
        $color = 'none';
        if ($cell == WHITE) {
            $color = $white;
        }
        if ($cell == BLACK) {
            $color = $black;
        }
        $draw->setFillColor($color);
        $draw->rectangle(10 * $i, 10 * $j, 10 * $i + 10, 10 * $j + 10);
    }
}

$image->drawImage($draw);

header("Content-Type: image/png");
$data = $image->getImageBlob();
file_put_contents('part_2.png', $data);