<?php

declare(strict_types=1);

namespace App\Services\TenantConfiguration;

final class ExchangePowerShellHashInputBuilder
{
    /**
     * @param  array<string, mixed>  $normalizedPayload
     * @return array<string, mixed>
     */
    public function build(
        string $resourceType,
        string $sourceSurface,
        string $commandContractName,
        string $commandContractVersion,
        string $payloadShapeVersion,
        string $normalizerVersion,
        array $normalizedPayload,
    ): array {
        return $this->canonicalize([
            'resource_type' => $resourceType,
            'source_surface' => $sourceSurface,
            'command_contract_name' => $commandContractName,
            'command_contract_version' => $commandContractVersion,
            'payload_shape_version' => $payloadShapeVersion,
            'normalizer_version' => $normalizerVersion,
            'normalized_payload' => $normalizedPayload,
        ]);
    }

    /**
     * @param  array<string, mixed>  $hashInput
     */
    public function hash(array $hashInput): string
    {
        return hash('sha256', $this->canonicalJson($hashInput));
    }

    /**
     * @param  array<string, mixed>  $hashInput
     */
    public function canonicalJson(array $hashInput): string
    {
        return json_encode($this->canonicalize($hashInput), JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR);
    }

    private function canonicalize(mixed $value): mixed
    {
        if (! is_array($value)) {
            return $value;
        }

        if (array_is_list($value)) {
            return array_map(fn (mixed $item): mixed => $this->canonicalize($item), $value);
        }

        $normalized = [];

        foreach ($value as $key => $nestedValue) {
            if ($nestedValue === null) {
                continue;
            }

            $normalized[(string) $key] = $this->canonicalize($nestedValue);
        }

        ksort($normalized, SORT_NATURAL | SORT_FLAG_CASE);

        return $normalized;
    }
}