kalash-job/php-project-lvl2

<?php

namespace Differ\Plain;

use function Functional\flatten;

function stringify($value)
{
    if ($value === true) {
        return 'true';
    } elseif ($value === false) {
        return 'false';
    } elseif ($value === null) {
        return 'null';
    } elseif (is_object($value)) {
        return "'complex value'";
    } elseif (is_string($value)) {
        return "'{$value}'";
    }
    return $value;
}

function iter(array $tree, string $path): array
{
    return array_map(function ($node) use ($path) {
        switch ($node['type']) {
            case 'changed':
                $oldValue = stringify($node['oldValue']);
                $newValue = stringify($node['newValue']);
                return "Property '{$path}{$node['key']}' was changed. From {$oldValue} to {$newValue}";
            case 'added':
                $value = stringify($node['value']);
                return "Property '{$path}{$node['key']}' was added with value: {$value}";
            case 'removed':
                return "Property '{$path}{$node['key']}' was removed";
            case 'same':
                return [];
            case 'parent':
                $newPath = "{$path}{$node['key']}.";
                $children = $node['children'];
                return iter($children, $newPath);
            default:
                throw new \Exception("Unknown node type '{$node['type']}'");
        }
    }, $tree);
}

function renderPlainDiff(array $diff): string
{
    $lines = iter($diff, '');
    $joinedLine = implode("\n", flatten($lines));
    return "{$joinedLine}\n";
}