<?php

declare(strict_types=1);

namespace app\common\service\pharmacy;

use Closure;
use RuntimeException;
use think\facade\Config;

final class EjPharmacyClient
{
    private string $baseUrl;
    private string $appKey;
    private string $appSecret;
    /** @var null|Closure(string,string,string,array<int,string>):array{http_status:int,body:array<string,mixed>,request_id:string} */
    private ?Closure $transport;

    public function __construct(
        ?string $baseUrl = null,
        ?string $appKey = null,
        ?string $appSecret = null,
        ?callable $transport = null
    )
    {
        $this->baseUrl = rtrim($baseUrl ?? (string) Config::get('ej_pharmacy.base_url', ''), '/');
        $this->appKey = $appKey ?? (string) Config::get('ej_pharmacy.app_key', '');
        $this->appSecret = $appSecret ?? (string) Config::get('ej_pharmacy.app_secret', '');
        if ($this->baseUrl === '' || $this->appKey === '' || $this->appSecret === '') {
            throw new RuntimeException('恩济药房接口未配置完整');
        }
        $this->transport = $transport === null ? null : Closure::fromCallable($transport);
    }

    public static function isConfigured(): bool
    {
        return (bool) Config::get('ej_pharmacy.enabled', false)
            && trim((string) Config::get('ej_pharmacy.base_url', '')) !== ''
            && trim((string) Config::get('ej_pharmacy.app_key', '')) !== ''
            && trim((string) Config::get('ej_pharmacy.app_secret', '')) !== '';
    }

    /** @return array{http_status:int,body:array<string,mixed>,request_id:string} */
    public function medicines(int $after = 0, int $limit = 100): array
    {
        return $this->request('GET', '/api/openapi/v1/medicines', null, [
            'after' => max($after, 0),
            'limit' => min(max($limit, 1), 500),
        ]);
    }

    /** @param array<string,mixed> $payload @return array{http_status:int,body:array<string,mixed>,request_id:string} */
    public function importMedicines(array $payload): array
    {
        return $this->request('POST', '/api/openapi/v1/medicine-imports', $payload);
    }

    /** @param array<string,mixed> $payload @return array{http_status:int,body:array<string,mixed>,request_id:string} */
    public function createPrescriptionOrder(array $payload): array
    {
        return $this->request('POST', '/api/openapi/v1/prescription-orders', $payload);
    }

    /** @return array{http_status:int,body:array<string,mixed>,request_id:string} */
    public function prescriptionOrder(string $sourceOrderNo, int $sourceRevision = 0): array
    {
        $query = ['source_system' => 'zyt'];
        if ($sourceRevision > 0) {
            $query['source_revision'] = $sourceRevision;
        }
        return $this->request(
            'GET',
            '/api/openapi/v1/prescription-orders/' . rawurlencode($sourceOrderNo),
            null,
            $query
        );
    }

    /** @param array<string,mixed>|null $payload @param array<string,int|string> $query @return array{http_status:int,body:array<string,mixed>,request_id:string} */
    private function request(string $method, string $path, ?array $payload = null, array $query = []): array
    {
        $queryString = $query === [] ? '' : http_build_query($query, '', '&', PHP_QUERY_RFC3986);
        $pathWithQuery = $path . ($queryString !== '' ? '?' . $queryString : '');
        $body = $payload === null
            ? ''
            : (string) json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR);
        $timestamp = (string) time();
        $nonce = bin2hex(random_bytes(16));
        $requestId = bin2hex(random_bytes(16));
        $canonical = EjPharmacySignature::canonical($method, $pathWithQuery, $timestamp, $nonce, $body);

        $headers = [
            'Accept: application/json',
            'Content-Type: application/json; charset=utf-8',
            'X-App-Key: ' . $this->appKey,
            'X-Timestamp: ' . $timestamp,
            'X-Nonce: ' . $nonce,
            'X-Signature: ' . EjPharmacySignature::sign($this->appSecret, $canonical),
            'X-Request-Id: ' . $requestId,
            'Expect:',
        ];

        if ($this->transport !== null) {
            return ($this->transport)(strtoupper($method), $pathWithQuery, $body, $headers);
        }

        $configuredTransport = strtolower((string) Config::get('ej_pharmacy.http_transport', 'auto'));
        $curlSsl = strtoupper((string) ((function_exists('curl_version') ? curl_version() : [])['ssl_version'] ?? ''));
        if ($configuredTransport === 'openssl'
            || ($configuredTransport === 'auto' && str_starts_with($curlSsl, 'NSS/'))
        ) {
            return $this->requestWithOpenSsl($method, $pathWithQuery, $body, $headers, $requestId);
        }

        $ch = curl_init($this->baseUrl . $pathWithQuery);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CUSTOMREQUEST => strtoupper($method),
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_CONNECTTIMEOUT => (int) Config::get('ej_pharmacy.connect_timeout', 5),
            CURLOPT_TIMEOUT => (int) Config::get('ej_pharmacy.request_timeout', 30),
            CURLOPT_SSL_VERIFYPEER => true,
            CURLOPT_SSL_VERIFYHOST => 2,
        ]);
        if ($payload !== null) {
            curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
        }
        $raw = curl_exec($ch);
        $httpStatus = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);
        if ($raw === false) {
            throw new RuntimeException('恩济药房通信失败：' . $error);
        }
        $decoded = json_decode((string) $raw, true);
        if (!is_array($decoded)) {
            throw new RuntimeException('恩济药房返回了无效 JSON，HTTP ' . $httpStatus);
        }

        return ['http_status' => $httpStatus, 'body' => $decoded, 'request_id' => $requestId];
    }

    /** @param array<int,string> $headers @return array{http_status:int,body:array<string,mixed>,request_id:string} */
    private function requestWithOpenSsl(
        string $method,
        string $path,
        string $body,
        array $headers,
        string $requestId
    ): array {
        $ssl = [
            'verify_peer' => true,
            'verify_peer_name' => true,
            'allow_self_signed' => false,
        ];
        $caFile = trim((string) Config::get('ej_pharmacy.ca_file', ''));
        if ($caFile !== '') {
            $ssl['cafile'] = $caFile;
        }

        $context = stream_context_create([
            'http' => [
                'method' => strtoupper($method),
                'header' => implode("\r\n", $headers),
                'content' => $body,
                'ignore_errors' => true,
                'timeout' => (int) Config::get('ej_pharmacy.request_timeout', 30),
                'protocol_version' => 1.1,
            ],
            'ssl' => $ssl,
        ]);
        $raw = @file_get_contents($this->baseUrl . $path, false, $context);
        if ($raw === false) {
            $lastError = error_get_last();
            $message = is_array($lastError) ? (string) ($lastError['message'] ?? '') : '';
            throw new RuntimeException('恩济药房通信失败：' . ($message !== '' ? $message : 'OpenSSL 请求失败'));
        }

        $httpStatus = 0;
        $responseHeaders = $http_response_header ?? [];
        foreach (array_reverse($responseHeaders) as $responseHeader) {
            if (preg_match('/^HTTP\/\S+\s+(\d{3})\b/i', $responseHeader, $matches)) {
                $httpStatus = (int) $matches[1];
                break;
            }
        }
        $decoded = json_decode((string) $raw, true);
        if (!is_array($decoded)) {
            throw new RuntimeException('恩济药房返回了无效 JSON，HTTP ' . $httpStatus);
        }

        return ['http_status' => $httpStatus, 'body' => $decoded, 'request_id' => $requestId];
    }
}