<?php

include '../functions.php';

$array = array_map(fn($row) => array_filter(explode(' ', $row)), explode("\n", file_get_contents('./input.txt')));

$array = matrix_rotate_clockwise($array);

$sums = [];
foreach ($array as $row) {
    $operation = array_shift($row);
    if ($operation == '+') {
        $data = array_sum($row);
    }
    if ($operation == '*') {
        $data = array_reduce($row, function($carry, $item) {
            $carry *= $item;
            return $carry;
        }, 1);
    }

    $sums[] = $data;
    print_message(sprintf('%s = %s', implode($operation, $row), $data));
}

print_message(array_sum($sums));

function matrix_rotate_clockwise($matrix)
{
    array_unshift($matrix, null);
    $matrix = call_user_func_array('array_map', $matrix);
    $matrix = array_map('array_reverse', $matrix);

    return $matrix;
}