<?php

namespace YaySMTP\Aws3\Aws\Endpoint;

use ArrayAccess;
use YaySMTP\Aws3\Aws\HasDataTrait;
use InvalidArgumentException as Iae;
/**
 * Default implementation of an AWS partition.
 */
final class Partition implements \ArrayAccess, \YaySMTP\Aws3\Aws\Endpoint\PartitionInterface
{
    use HasDataTrait;
    /**
     * The partition constructor accepts the following options:
     *
     * - `partition`: (string, required) The partition name as specified in an
     *   ARN (e.g., `aws`)
     * - `partitionName`: (string) The human readable name of the partition
     *   (e.g., "AWS Standard")
     * - `dnsSuffix`: (string, required) The DNS suffix of the partition. This
     *   value is used to determine how endpoints in the partition are resolved.
     * - `regionRegex`: (string) A PCRE regular expression that specifies the
     *   pattern that region names in the endpoint adhere to.
     * - `regions`: (array, required) A map of the regions in the partition.
     *   Each key is the region as present in a hostname (e.g., `us-east-1`),
     *   and each value is a structure containing region information.
     * - `defaults`: (array) A map of default key value pairs to apply to each
     *   endpoint of the partition. Any value in an `endpoint` definition will
     *   supersede any values specified in `defaults`.
     * - `services`: (array, required) A map of service endpoint prefix name
     *   (the value found in a hostname) to information about the service.
     *
     * @param array $definition
     *
     * @throws Iae if any required options are missing
     */
    public function __construct(array $definition)
    {
        foreach (['partition', 'regions', 'services', 'dnsSuffix'] as $key) {
            if (!isset($definition[$key])) {
                throw new \InvalidArgumentException("Partition missing required {$key} field");
            }
        }
        $this->data = $definition;
    }
    public function getName()
    {
        return $this->data['partition'];
    }
    public function isRegionMatch($region, $service)
    {
        if (isset($this->data['regions'][$region]) || isset($this->data['services'][$service]['endpoints'][$region])) {
            return true;
        }
        if (isset($this->data['regionRegex'])) {
            return (bool) preg_match("@{$this->data['regionRegex']}@", $region);
        }
        return false;
    }
    public function getAvailableEndpoints($service, $allowNonRegionalEndpoints = false)
    {
        if ($this->isServicePartitionGlobal($service)) {
            return [$this->getPartitionEndpoint($service)];
        }
        if (isset($this->data['services'][$service]['endpoints'])) {
            $serviceRegions = array_keys($this->data['services'][$service]['endpoints']);
            return $allowNonRegionalEndpoints ? $serviceRegions : array_intersect($serviceRegions, array_keys($this->data['regions']));
        }
        return [];
    }
    public function __invoke(array $args = [])
    {
        $service = isset($args['service']) ? $args['service'] : '';
        $region = isset($args['region']) ? $args['region'] : '';
        $scheme = isset($args['scheme']) ? $args['scheme'] : 'https';
        $data = $this->getEndpointData($service, $region);
        return ['endpoint' => "{$scheme}://" . $this->formatEndpoint(isset($data['hostname']) ? $data['hostname'] : '', $service, $region), 'signatureVersion' => $this->getSignatureVersion($data), 'signingRegion' => isset($data['credentialScope']['region']) ? $data['credentialScope']['region'] : $region, 'signingName' => isset($data['credentialScope']['service']) ? $data['credentialScope']['service'] : $service];
    }
    private function getEndpointData($service, $region)
    {
        $resolved = $this->resolveRegion($service, $region);
        $data = isset($this->data['services'][$service]['endpoints'][$resolved]) ? $this->data['services'][$service]['endpoints'][$resolved] : [];
        $data += isset($this->data['services'][$service]['defaults']) ? $this->data['services'][$service]['defaults'] : [];
        $data += isset($this->data['defaults']) ? $this->data['defaults'] : [];
        return $data;
    }
    private function getSignatureVersion(array $data)
    {
        static $supportedBySdk = ['s3v4', 'v4', 'anonymous'];
        $possibilities = array_intersect($supportedBySdk, isset($data['signatureVersions']) ? $data['signatureVersions'] : ['v4']);
        return array_shift($possibilities);
    }
    private function resolveRegion($service, $region)
    {
        if ($this->isServicePartitionGlobal($service)) {
            return $this->getPartitionEndpoint($service);
        }
        return $region;
    }
    private function isServicePartitionGlobal($service)
    {
        return isset($this->data['services'][$service]['isRegionalized']) && false === $this->data['services'][$service]['isRegionalized'] && isset($this->data['services'][$service]['partitionEndpoint']);
    }
    private function getPartitionEndpoint($service)
    {
        return $this->data['services'][$service]['partitionEndpoint'];
    }
    private function formatEndpoint($template, $service, $region)
    {
        return strtr($template, ['{service}' => $service, '{region}' => $region, '{dnsSuffix}' => $this->data['dnsSuffix']]);
    }
}
