<?php

namespace App\Services;

use App\Models\EtsyAppCredential;
use App\Models\EtsyConnection;
use Illuminate\Http\Client\RequestException;
use Illuminate\Support\Facades\Http;
use RuntimeException;

class Etsy
{
    private const API_URL = 'https://api.etsy.com/v3';

    /** @var list<string> */
    public const REQUIRED_SCOPES = ['listings_r', 'listings_w', 'transactions_r', 'transactions_w', 'shops_r'];

    /** @var list<string> */
    public const LISTING_STATES = ['draft', 'active', 'inactive', 'expired', 'sold_out'];

    public function __construct(private IntegrationCache $cache) {}

    /** @var array{keystring: ?string, shared_secret: ?string, shop_name: string, redirect_uri: ?string}|null */
    private ?array $credentials = null;

    public function configured(): bool
    {
        $credentials = $this->credentials();

        return filled($credentials['keystring']) && filled($credentials['shared_secret']);
    }

    public function authorizationUrl(string $state, string $verifier): string
    {
        if (! $this->configured()) {
            throw new RuntimeException('Etsy application credentials are not configured.');
        }
        $challenge = rtrim(strtr(base64_encode(hash('sha256', $verifier, true)), '+/', '-_'), '=');

        return 'https://www.etsy.com/oauth/connect?'.http_build_query([
            'response_type' => 'code', 'redirect_uri' => $this->redirectUri(),
            'scope' => implode(' ', self::REQUIRED_SCOPES), 'client_id' => $this->credentials()['keystring'],
            'state' => $state, 'code_challenge' => $challenge, 'code_challenge_method' => 'S256',
        ], '', '&', PHP_QUERY_RFC3986);
    }

    public function connect(string $code, string $verifier): EtsyConnection
    {
        $tokens = Http::asForm()->acceptJson()->connectTimeout(3)->timeout(10)
            ->post(self::API_URL.'/public/oauth/token', [
                'grant_type' => 'authorization_code', 'client_id' => $this->credentials()['keystring'],
                'redirect_uri' => $this->redirectUri(), 'code' => $code, 'code_verifier' => $verifier,
            ])->throw()->json();
        $userId = explode('.', $tokens['access_token'] ?? '')[0];
        if (! ctype_digit($userId) || empty($tokens['refresh_token'])) {
            throw new RuntimeException('Etsy returned an invalid OAuth response.');
        }

        $shop = $this->request('GET', 'application/users/'.$userId.'/shops', $tokens['access_token']);
        if (empty($shop['shop_id'])) {
            throw new RuntimeException('This Etsy account does not own a shop.');
        }
        if (strcasecmp($shop['shop_name'] ?? '', $this->credentials()['shop_name']) !== 0) {
            throw new RuntimeException('The Etsy account does not own the configured HickLab3D shop.');
        }

        return EtsyConnection::updateOrCreate(['shop_id' => $shop['shop_id']], [
            'shop_name' => $shop['shop_name'] ?? 'Etsy shop',
            'access_token' => $tokens['access_token'], 'refresh_token' => $tokens['refresh_token'],
            'expires_at' => now()->addSeconds(max(60, (int) ($tokens['expires_in'] ?? 3600) - 60)),
            'scopes' => isset($tokens['scope']) ? trim((string) $tokens['scope']) : null,
        ]);
    }

    /** Paid, unshipped orders that still need dispatching, excluding cancelled and fully refunded ones. */
    public function receipts(EtsyConnection $connection, bool $fresh = false): array
    {
        return $this->cache->remember('etsy.receipts.'.$connection->shop_id, 300, function () use ($connection): array {
            $response = $this->request('GET', 'application/shops/'.$connection->shop_id.'/receipts', $this->accessToken($connection), [
                'was_paid' => 'true', 'was_shipped' => 'false', 'limit' => 50,
            ]);
            $results = array_values(array_filter($response['results'] ?? [], fn ($receipt): bool => is_array($receipt) && ! $this->isCancelledOrRefunded($receipt)));

            return ['count' => count($results), 'results' => $results] + $response;
        }, $fresh);
    }

    /** @param array<string, mixed> $receipt */
    public function isCancelledOrRefunded(array $receipt): bool
    {
        if (in_array(strtolower((string) ($receipt['status'] ?? '')), ['canceled', 'cancelled'], true) || ! empty($receipt['was_canceled'])) {
            return true;
        }

        $total = (float) ($receipt['grandtotal']['amount'] ?? 0) / max(1, (int) ($receipt['grandtotal']['divisor'] ?? 1));
        $refunded = collect($receipt['refunds'] ?? [])->sum(fn ($refund): float => (float) ($refund['amount']['amount'] ?? 0) / max(1, (int) ($refund['amount']['divisor'] ?? 1)));

        return $total > 0 && $refunded >= $total;
    }

    public function listings(EtsyConnection $connection, bool $fresh = false): array
    {
        return $this->cache->remember('etsy.listings.'.$connection->shop_id, 600, fn (): array => $this->request(
            'GET',
            'application/shops/'.$connection->shop_id.'/listings',
            $this->accessToken($connection),
            ['state' => 'active', 'limit' => 20],
        ), $fresh);
    }

    /**
     * @return array{
     *     configured: bool,
     *     connected: bool,
     *     shop_name: ?string,
     *     shop_id: mixed,
     *     configured_shop_name: string,
     *     token_expires_at: ?string,
     *     token_expired: ?bool,
     *     required_scopes: list<string>,
     *     connected_scopes: ?list<string>,
     *     missing_scopes: list<string>,
     *     reconnect_required: bool,
     *     reconnect_reason: ?string
     * }
     */
    public function shopStatus(): array
    {
        $configured = $this->configured();
        $connection = EtsyConnection::first();
        $connectedScopes = $this->scopeList($connection?->scopes);
        $missing = [];
        $reconnect = false;
        $reason = null;

        if (! $configured) {
            $reason = 'Etsy application credentials are not configured. Save them on the Settings page or set ETSY_KEYSTRING and ETSY_SHARED_SECRET.';
        } elseif (! $connection) {
            $reason = 'Etsy shop is not connected. An admin must connect the shop in the dashboard.';
        } elseif (strcasecmp($connection->shop_name, $this->credentials()['shop_name']) !== 0) {
            $reconnect = true;
            $reason = 'The Etsy account does not own the configured HickLab3D shop.';
        } elseif ($connectedScopes === null) {
            $reconnect = true;
            $reason = 'OAuth scopes are unknown on this connection. An admin must reconnect Etsy in the dashboard after deploying expanded shop-management scopes.';
        } else {
            $missing = array_values(array_diff(self::REQUIRED_SCOPES, $connectedScopes));
            $reconnect = $missing !== [];
            $reason = $reconnect
                ? 'Missing OAuth scopes: '.implode(', ', $missing).'. An admin must reconnect Etsy in the dashboard.'
                : null;
        }

        return [
            'configured' => $configured,
            'connected' => $connection !== null,
            'shop_name' => $connection?->shop_name,
            'shop_id' => $connection?->shop_id,
            'configured_shop_name' => $this->credentials()['shop_name'],
            'token_expires_at' => $connection?->expires_at?->toIso8601String(),
            'token_expired' => $connection ? $connection->expires_at->isPast() : null,
            'required_scopes' => self::REQUIRED_SCOPES,
            'connected_scopes' => $connectedScopes,
            'missing_scopes' => $missing,
            'reconnect_required' => $reconnect,
            'reconnect_reason' => $reason,
        ];
    }

    public function connectedShop(): EtsyConnection
    {
        if (! $this->configured()) {
            throw new RuntimeException('Etsy application credentials are not configured.');
        }
        $connection = EtsyConnection::first();
        if (! $connection) {
            throw new RuntimeException('Etsy shop is not connected. An admin must connect the shop in the dashboard.');
        }
        if (strcasecmp($connection->shop_name, $this->credentials()['shop_name']) !== 0) {
            throw new RuntimeException('The Etsy account does not own the configured HickLab3D shop.');
        }

        return $connection;
    }

    /**
     * @return array{count: int, limit: int, offset: int, state: string, results: list<array<string, mixed>>}
     */
    public function listListings(EtsyConnection $connection, string $state = 'active', int $limit = 25, int $offset = 0): array
    {
        $state = strtolower($state);
        if (! in_array($state, self::LISTING_STATES, true)) {
            throw new RuntimeException('Listing state must be one of: '.implode(', ', self::LISTING_STATES).'.');
        }
        [$limit, $offset] = $this->page($limit, $offset);
        $response = $this->request('GET', 'application/shops/'.$connection->shop_id.'/listings', $this->accessToken($connection), [
            'state' => $state, 'limit' => $limit, 'offset' => $offset,
        ]);

        return [
            'count' => (int) ($response['count'] ?? count($response['results'] ?? [])),
            'limit' => $limit,
            'offset' => $offset,
            'state' => $state,
            'results' => array_map(fn (array $listing): array => $this->summarizeListing($listing), $this->results($response)),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    public function getListing(EtsyConnection $connection, int $listingId): array
    {
        $listing = $this->request('GET', 'application/listings/'.$listingId, $this->accessToken($connection));
        $this->assertListingBelongsToShop($connection, $listing);

        return $this->summarizeListing($listing, detailed: true);
    }

    /**
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    public function createDraftListing(EtsyConnection $connection, array $payload): array
    {
        foreach (['quantity', 'title', 'description', 'price', 'who_made', 'when_made', 'taxonomy_id'] as $field) {
            if (! array_key_exists($field, $payload) || $payload[$field] === '' || $payload[$field] === null) {
                throw new RuntimeException("Draft listing requires {$field}.");
            }
        }
        unset($payload['state'], $payload['shop_id'], $payload['listing_id']);
        $listing = $this->request('POST', 'application/shops/'.$connection->shop_id.'/listings', $this->accessToken($connection), body: $payload);
        $this->cache->forget('etsy.listings.'.$connection->shop_id);

        return $this->summarizeListing($listing, detailed: true);
    }

    /**
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    public function updateListing(EtsyConnection $connection, int $listingId, array $payload): array
    {
        if (isset($payload['state']) && strtolower((string) $payload['state']) === 'active') {
            throw new RuntimeException('Activating a listing requires etsy_publish_listing with confirm=true. HL3D listings stay draft until the operator authorises going live.');
        }
        unset($payload['shop_id'], $payload['listing_id']);
        $listing = $this->request('PATCH', 'application/shops/'.$connection->shop_id.'/listings/'.$listingId, $this->accessToken($connection), body: $payload);
        $this->assertListingBelongsToShop($connection, $listing);
        $this->cache->forget('etsy.listings.'.$connection->shop_id);

        return $this->summarizeListing($listing, detailed: true);
    }

    /**
     * @return array<string, mixed>
     */
    public function publishListing(EtsyConnection $connection, int $listingId, bool $confirm = false): array
    {
        if (! $confirm) {
            throw new RuntimeException('Publishing a listing requires confirm=true. HL3D listings stay draft until the operator authorises going live.');
        }
        $listing = $this->request('PATCH', 'application/shops/'.$connection->shop_id.'/listings/'.$listingId, $this->accessToken($connection), body: ['state' => 'active']);
        $this->assertListingBelongsToShop($connection, $listing);
        $this->cache->forget('etsy.listings.'.$connection->shop_id);

        return $this->summarizeListing($listing, detailed: true);
    }

    /**
     * @return array<string, mixed>
     */
    public function getListingInventory(EtsyConnection $connection, int $listingId): array
    {
        return $this->request('GET', 'application/listings/'.$listingId.'/inventory', $this->accessToken($connection));
    }

    /**
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    public function updateListingInventory(EtsyConnection $connection, int $listingId, array $payload): array
    {
        if (! isset($payload['products']) && array_key_exists('quantity', $payload)) {
            $payload = ['products' => $this->productsWithQuantity($this->getListingInventory($connection, $listingId), (int) $payload['quantity'])];
        }
        if (! isset($payload['products']) || ! is_array($payload['products'])) {
            throw new RuntimeException('Inventory update requires products or quantity.');
        }
        $inventory = $this->request('PUT', 'application/listings/'.$listingId.'/inventory', $this->accessToken($connection), body: ['products' => $payload['products']], jsonBody: true);
        $this->cache->forget('etsy.listings.'.$connection->shop_id);

        return $inventory;
    }

    /**
     * @param  array{was_paid?: bool|string|null, was_shipped?: bool|string|null, limit?: int, offset?: int}  $filters
     * @return array{count: int, limit: int, offset: int, results: list<array<string, mixed>>}
     */
    public function listReceipts(EtsyConnection $connection, array $filters = []): array
    {
        [$limit, $offset] = $this->page((int) ($filters['limit'] ?? 25), (int) ($filters['offset'] ?? 0));
        $query = ['limit' => $limit, 'offset' => $offset];
        foreach (['was_paid', 'was_shipped'] as $flag) {
            if (array_key_exists($flag, $filters) && $filters[$flag] !== null && $filters[$flag] !== '') {
                $query[$flag] = filter_var($filters[$flag], FILTER_VALIDATE_BOOLEAN) ? 'true' : 'false';
            }
        }
        $response = $this->request('GET', 'application/shops/'.$connection->shop_id.'/receipts', $this->accessToken($connection), $query);

        return [
            'count' => (int) ($response['count'] ?? count($response['results'] ?? [])),
            'limit' => $limit,
            'offset' => $offset,
            'results' => array_map(fn (array $receipt): array => $this->summarizeReceipt($receipt), $this->results($response)),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    public function getReceipt(EtsyConnection $connection, int $receiptId): array
    {
        $receipt = $this->request('GET', 'application/shops/'.$connection->shop_id.'/receipts/'.$receiptId, $this->accessToken($connection));

        return $this->summarizeReceipt($receipt, detailed: true);
    }

    /**
     * @param  array<string, mixed>  $extra
     * @return array<string, mixed>
     */
    public function createReceiptShipment(EtsyConnection $connection, int $receiptId, string $trackingCode, string $carrierName, array $extra = []): array
    {
        if ($trackingCode === '' || $carrierName === '') {
            throw new RuntimeException('Marking a receipt shipped requires tracking_code and carrier_name.');
        }
        $body = ['tracking_code' => $trackingCode, 'carrier_name' => $carrierName];
        if (array_key_exists('send_bcc', $extra) && $extra['send_bcc'] !== null) {
            $body['send_bcc'] = filter_var($extra['send_bcc'], FILTER_VALIDATE_BOOLEAN) ? 'true' : 'false';
        }
        if (filled($extra['note_to_buyer'] ?? null)) {
            $body['note_to_buyer'] = (string) $extra['note_to_buyer'];
        }
        $shipment = $this->request('POST', 'application/shops/'.$connection->shop_id.'/receipts/'.$receiptId.'/tracking', $this->accessToken($connection), body: $body);
        $this->cache->forget('etsy.receipts.'.$connection->shop_id);

        return [
            'receipt_id' => $shipment['receipt_id'] ?? $receiptId,
            'tracking_code' => $shipment['tracking_code'] ?? $trackingCode,
            'carrier_name' => $shipment['carrier_name'] ?? $carrierName,
            'shop_id' => $connection->shop_id,
        ];
    }

    /**
     * @param  array{limit?: int, offset?: int}  $filters
     * @return array{count: int, limit: int, offset: int, results: list<array<string, mixed>>, conversations_api: array<string, mixed>}
     */
    public function listReceiptMessages(EtsyConnection $connection, array $filters = []): array
    {
        $page = $this->listReceipts($connection, $filters);
        $results = array_values(array_filter($page['results'], fn (array $receipt): bool => ($receipt['has_buyer_message'] ?? false) || ($receipt['has_seller_message'] ?? false)));

        return [
            'count' => count($results),
            'limit' => $page['limit'],
            'offset' => $page['offset'],
            'results' => $results,
            'conversations_api' => $this->conversationsGap(),
        ];
    }

    /**
     * @return array<string, mixed>
     */
    public function getReceiptMessages(EtsyConnection $connection, int $receiptId): array
    {
        $receipt = $this->getReceipt($connection, $receiptId);

        return [
            'receipt_id' => $receipt['receipt_id'] ?? $receiptId,
            'message_from_buyer' => $receipt['message_from_buyer'] ?? null,
            'message_from_seller' => $receipt['message_from_seller'] ?? null,
            'message_from_payment' => $receipt['message_from_payment'] ?? null,
            'conversations_api' => $this->conversationsGap(),
        ];
    }

    public function redirectUri(): string
    {
        return $this->credentials()['redirect_uri'] ?: route('etsy.callback');
    }

    /**
     * Public wrapper around the on-demand token refresh logic, for the
     * etsy:refresh-token scheduled command to call proactively so the OAuth
     * connection stays alive even during quiet periods with no receipts or
     * listings activity to trigger a refresh as a side effect.
     */
    public function refreshAccessToken(EtsyConnection $connection): string
    {
        return $this->accessToken($connection);
    }

    private function accessToken(EtsyConnection $connection): string
    {
        if ($connection->expires_at->isFuture()) {
            return $connection->access_token;
        }
        $tokens = Http::asForm()->acceptJson()->connectTimeout(3)->timeout(10)
            ->post(self::API_URL.'/public/oauth/token', [
                'grant_type' => 'refresh_token', 'client_id' => $this->credentials()['keystring'],
                'refresh_token' => $connection->refresh_token,
            ])->throw()->json();
        if (empty($tokens['access_token']) || empty($tokens['refresh_token'])) {
            throw new RuntimeException('Etsy did not refresh the shop connection.');
        }
        $connection->update([
            'access_token' => $tokens['access_token'], 'refresh_token' => $tokens['refresh_token'],
            'expires_at' => now()->addSeconds(max(60, (int) ($tokens['expires_in'] ?? 3600) - 60)),
            ...isset($tokens['scope']) ? ['scopes' => trim((string) $tokens['scope'])] : [],
        ]);

        return $tokens['access_token'];
    }

    /**
     * @param  array<string, mixed>  $query
     * @param  array<string, mixed>|null  $body
     * @return array<string, mixed>
     */
    private function request(string $method, string $path, string $accessToken, array $query = [], ?array $body = null, bool $jsonBody = false): array
    {
        $credentials = $this->credentials();
        $pending = Http::withHeaders(['x-api-key' => $credentials['keystring'].':'.$credentials['shared_secret']])
            ->withToken($accessToken)->acceptJson()->connectTimeout(3)->timeout(15);
        $url = self::API_URL.'/'.$path;
        $method = strtoupper($method);

        try {
            $response = match ($method) {
                'GET', 'DELETE' => $pending->{strtolower($method)}($url, $query),
                default => $jsonBody
                    ? $pending->asJson()->{strtolower($method)}($url, $body ?? [])
                    : $pending->asForm()->{strtolower($method)}($url, $body ?? []),
            };
            $decoded = $response->throw()->json();
        } catch (RequestException $exception) {
            throw new RuntimeException($this->httpErrorMessage($exception), (int) $exception->response?->status(), $exception);
        }

        return is_array($decoded) ? $decoded : [];
    }

    private function httpErrorMessage(RequestException $exception): string
    {
        $status = $exception->response?->status();
        $body = $exception->response?->json();
        $etsy = is_array($body) ? (string) ($body['error'] ?? $body['error_description'] ?? '') : '';
        $message = 'Etsy API request failed'.($status ? " (HTTP {$status})" : '').($etsy !== '' ? ': '.$etsy : '.');
        if ($status === 403) {
            $message .= ' This usually means the stored OAuth token is missing write scopes. An admin must reconnect Etsy in the dashboard.';
        }

        return $message;
    }

    /**
     * @param  array<string, mixed>  $listing
     */
    private function assertListingBelongsToShop(EtsyConnection $connection, array $listing): void
    {
        if (isset($listing['shop_id']) && (int) $listing['shop_id'] !== (int) $connection->shop_id) {
            throw new RuntimeException('That listing does not belong to the connected HickLab3D shop.');
        }
    }

    /**
     * @param  array<string, mixed>  $listing
     * @return array<string, mixed>
     */
    private function summarizeListing(array $listing, bool $detailed = false): array
    {
        $summary = [
            'listing_id' => $listing['listing_id'] ?? null,
            'shop_id' => $listing['shop_id'] ?? null,
            'title' => $listing['title'] ?? null,
            'state' => $listing['state'] ?? null,
            'quantity' => $listing['quantity'] ?? null,
            'price' => $listing['price'] ?? null,
            'url' => $listing['url'] ?? null,
            'taxonomy_id' => $listing['taxonomy_id'] ?? null,
            'last_modified_timestamp' => $listing['last_modified_timestamp'] ?? null,
        ];
        if ($detailed) {
            $summary['description'] = $listing['description'] ?? null;
            $summary['who_made'] = $listing['who_made'] ?? null;
            $summary['when_made'] = $listing['when_made'] ?? null;
            $summary['tags'] = $listing['tags'] ?? [];
            $summary['materials'] = $listing['materials'] ?? [];
            $summary['shipping_profile_id'] = $listing['shipping_profile_id'] ?? null;
            $summary['is_personalizable'] = $listing['is_personalizable'] ?? null;
        }

        return $summary;
    }

    /**
     * @param  array<string, mixed>  $receipt
     * @return array<string, mixed>
     */
    private function summarizeReceipt(array $receipt, bool $detailed = false): array
    {
        $summary = [
            'receipt_id' => $receipt['receipt_id'] ?? null,
            'status' => $receipt['status'] ?? null,
            'was_paid' => $receipt['was_paid'] ?? null,
            'was_shipped' => $receipt['was_shipped'] ?? null,
            'was_canceled' => $receipt['was_canceled'] ?? null,
            'create_timestamp' => $receipt['create_timestamp'] ?? null,
            'grandtotal' => $receipt['grandtotal'] ?? null,
            'name' => $receipt['name'] ?? null,
            'city' => $receipt['city'] ?? null,
            'state' => $receipt['state'] ?? null,
            'zip' => $receipt['zip'] ?? null,
            'country_iso' => $receipt['country_iso'] ?? null,
            'has_buyer_message' => filled($receipt['message_from_buyer'] ?? null),
            'has_seller_message' => filled($receipt['message_from_seller'] ?? null),
        ];
        if ($detailed) {
            $summary['first_line'] = $receipt['first_line'] ?? null;
            $summary['second_line'] = $receipt['second_line'] ?? null;
            $summary['message_from_buyer'] = $receipt['message_from_buyer'] ?? null;
            $summary['message_from_seller'] = $receipt['message_from_seller'] ?? null;
            $summary['message_from_payment'] = $receipt['message_from_payment'] ?? null;
        }

        return $summary;
    }

    /**
     * @param  array<string, mixed>  $inventory
     * @return list<array<string, mixed>>
     */
    private function productsWithQuantity(array $inventory, int $quantity): array
    {
        $products = [];
        foreach ($inventory['products'] ?? [] as $product) {
            if (! is_array($product)) {
                continue;
            }
            $offerings = [];
            foreach ($product['offerings'] ?? [] as $offering) {
                if (! is_array($offering)) {
                    continue;
                }
                $price = $offering['price'] ?? 0;
                if (is_array($price)) {
                    $price = (float) ($price['amount'] ?? 0) / max(1, (int) ($price['divisor'] ?? 1));
                }
                $offerings[] = [
                    'price' => $price,
                    'quantity' => $quantity,
                    'is_enabled' => $offering['is_enabled'] ?? true,
                ];
            }
            $products[] = [
                'sku' => $product['sku'] ?? '',
                'property_values' => $product['property_values'] ?? [],
                'offerings' => $offerings,
            ];
        }

        return $products;
    }

    /**
     * @return array{available: bool, reason: string, docs: list<string>}
     */
    private function conversationsGap(): array
    {
        return [
            'available' => false,
            'reason' => 'Etsy Open API v3 has no shop conversation/inbox endpoints and no conversations_* OAuth scopes. Receipt notes (message_from_buyer / message_from_seller) are the supported v3 surface. Sending a buyer-inbox reply is not available.',
            'docs' => [
                'https://developer.etsy.com/documentation/essentials/authentication',
                'https://developer.etsy.com/documentation/reference',
                'https://github.com/etsy/open-api/discussions/1645',
            ],
        ];
    }

    /**
     * @return list<array<string, mixed>>
     */
    private function results(array $response): array
    {
        return array_values(array_filter($response['results'] ?? [], 'is_array'));
    }

    /**
     * @return array{0: int, 1: int}
     */
    private function page(int $limit, int $offset): array
    {
        return [max(1, min(100, $limit)), max(0, $offset)];
    }

    /**
     * @return list<string>|null
     */
    private function scopeList(?string $scopes): ?array
    {
        if ($scopes === null || trim($scopes) === '') {
            return null;
        }

        return array_values(array_filter(preg_split('/\s+/', trim($scopes)) ?: []));
    }

    /** @return array{keystring: ?string, shared_secret: ?string, shop_name: string, redirect_uri: ?string} */
    private function credentials(): array
    {
        if ($this->credentials !== null) {
            return $this->credentials;
        }

        $stored = EtsyAppCredential::find(1);

        return $this->credentials = [
            'keystring' => $stored?->keystring ?: config('services.etsy.keystring'),
            'shared_secret' => $stored?->shared_secret ?: config('services.etsy.shared_secret'),
            'shop_name' => $stored?->shop_name ?: config('services.etsy.shop_name', 'HickLab3D'),
            'redirect_uri' => $stored?->redirect_uri ?: config('services.etsy.redirect_uri'),
        ];
    }
}