import { BadRequestException, ConflictException, ForbiddenException, forwardRef, HttpException, Inject, Injectable, NotFoundException, OnModuleDestroy, OnModuleInit, Optional, UnprocessableEntityException } from '@nestjs/common';
import { Prisma } from '@prisma/client';
import { Queue, Worker } from 'bullmq';
import { createHash, createHmac, randomBytes, randomUUID } from 'node:crypto';
import { lookup } from 'node:dns/promises';
import { isIP } from 'node:net';
import { request as httpRequest } from 'node:http';
import { request as httpsRequest } from 'node:https';
import { PrismaService } from '../prisma/prisma.service';
import { SendChainService } from '../send-chain/send-chain.service';
import { decryptSecret, encryptSecret } from './open-api.crypto';
import type { OpenApiAuthContext } from './open-api.types';
import { ProtocolLogsService } from '../protocol-logs/protocol-logs.service';
import { automaticDeliveryMode } from './delivery-mode';

const WEBHOOK_QUEUE = 'http-webhook-delivery';
const RETRY_DELAYS_SECONDS = [0, 60, 300, 900, 3600, 21600, 86400];

export type HttpConfigInput = {
  enabled?: boolean;
  sendEnabled?: boolean;
  messageQueryEnabled?: boolean;
  receiptWebhookEnabled?: boolean;
  uplinkWebhookEnabled?: boolean;
  uplinkQueryEnabled?: boolean;
  credentialSelfServiceEnabled?: boolean;
  qpsLimit?: number;
  timestampToleranceSeconds?: number;
  maxCredentialCount?: number;
  uplinkRetentionDays?: number;
  maxQueryRangeDays?: number;
  maxPageSize?: number;
  receiptDeliveryMode?: string;
  uplinkDeliveryMode?: string;
  webhookRetryEnabled?: boolean;
  webhookMaxAttempts?: number;
  webhookTimeoutSeconds?: number;
  requireHttps?: boolean;
  allowClientManualRetry?: boolean;
  allowClientTest?: boolean;
  ipAllowlist?: string[];
};

@Injectable()
export class OpenApiService implements OnModuleInit, OnModuleDestroy {
  private queue?: Queue<{ deliveryId: string }>;
  private worker?: Worker<{ deliveryId: string }>;

  constructor(
    private readonly prisma: PrismaService,
    @Inject(forwardRef(() => SendChainService)) private readonly sendChain: SendChainService,
    @Optional() private readonly protocolLogs?: ProtocolLogsService,
  ) {}

  onModuleInit() {
    const connection = bullmqConnection();
    this.queue = new Queue(WEBHOOK_QUEUE, { connection });
    this.worker = new Worker(WEBHOOK_QUEUE, (job) => this.deliverWebhook(job.data.deliveryId), { connection, concurrency: 10 });
  }

  async onModuleDestroy() {
    await this.worker?.close();
    await this.queue?.close();
  }

  async getConfig(applicationId: string, tenantId?: string) {
    const application = await this.requireApplication(applicationId, tenantId);
    return {
      applicationId,
      applicationName: application.name,
      publicOrigin: httpApiPublicOrigin(),
      config: application.httpConfig,
      ipAllowlist: application.httpIpAllowlist.map((item) => item.ipCidr),
    };
  }

  async updateConfig(applicationId: string, input: HttpConfigInput, tenantId?: string) {
    const application = await this.requireApplication(applicationId, tenantId);
    const data = normalizeConfig(input, application.httpConfig, application.interfaceEnabled !== false);
    const ipAllowlist = normalizeIpAllowlist(input.ipAllowlist);
    const [config] = await this.prisma.$transaction([
      this.prisma.smsApplicationHttpConfig.upsert({
        where: { applicationId },
        create: { applicationId, ...data },
        update: data,
      }),
      this.prisma.smsApplicationHttpIpAllowlist.deleteMany({ where: { applicationId } }),
      ...(ipAllowlist.length > 0 ? [this.prisma.smsApplicationHttpIpAllowlist.createMany({ data: ipAllowlist.map((ipCidr) => ({ applicationId, ipCidr })) })] : []),
    ]);
    return { applicationId, publicOrigin: httpApiPublicOrigin(), config, ipAllowlist };
  }

  async listCredentials(applicationId: string, tenantId?: string) {
    await this.requireApplication(applicationId, tenantId);
    return this.prisma.httpApiCredential.findMany({
      where: { applicationId },
      select: { id: true, name: true, accessKey: true, secretLast4: true, status: true, expiresAt: true, lastUsedAt: true, lastUsedIp: true, createdAt: true, revokedAt: true },
      orderBy: { createdAt: 'desc' },
    });
  }

  async createCredential(applicationId: string, data: { name?: string; expiresAt?: string; createdById?: string }, tenantId?: string, selfService = false) {
    const application = await this.requireApplication(applicationId, tenantId);
    const config = application.httpConfig;
    if (!config?.enabled) throw new BadRequestException('请先开通该应用的HTTP接口');
    if (selfService && !config.credentialSelfServiceEnabled) throw new ForbiddenException('该应用未开通客户端凭据自助管理');
    const activeCount = await this.prisma.httpApiCredential.count({ where: { applicationId, status: 'active' } });
    if (activeCount >= config.maxCredentialCount) throw new BadRequestException(`有效凭据最多允许 ${config.maxCredentialCount} 个`);
    const secret = randomBytes(32).toString('base64url');
    const credential = await this.prisma.httpApiCredential.create({
      data: {
        applicationId,
        name: String(data.name ?? '默认凭据').trim().slice(0, 100) || '默认凭据',
        accessKey: `ak_${randomBytes(18).toString('base64url')}`,
        secretEncrypted: encryptSecret(secret),
        secretLast4: secret.slice(-4),
        expiresAt: data.expiresAt ? new Date(data.expiresAt) : undefined,
        createdById: data.createdById,
      },
      select: { id: true, name: true, accessKey: true, secretLast4: true, status: true, expiresAt: true, createdAt: true },
    });
    return { ...credential, secret, secretShownOnce: true };
  }

  async revokeCredential(applicationId: string, credentialId: string, tenantId?: string) {
    const application = await this.requireApplication(applicationId, tenantId);
    if (tenantId && !application.httpConfig?.credentialSelfServiceEnabled) throw new ForbiddenException('该应用未开通客户端凭据自助管理');
    const result = await this.prisma.httpApiCredential.updateMany({
      where: { id: credentialId, applicationId, status: 'active' },
      data: { status: 'revoked', revokedAt: new Date() },
    });
    if (result.count !== 1) throw new NotFoundException('有效访问凭据不存在');
    return { id: credentialId, status: 'revoked' };
  }

  async getWebhookEndpoints(applicationId: string, tenantId?: string) {
    await this.requireApplication(applicationId, tenantId);
    return this.prisma.httpWebhookEndpoint.findMany({
      where: { applicationId },
      select: { id: true, eventType: true, url: true, secretLast4: true, status: true, lastTestAt: true, lastTestStatus: true, updatedAt: true },
      orderBy: { eventType: 'asc' },
    });
  }

  async upsertWebhookEndpoint(applicationId: string, eventType: string, data: { url: string; rotateSecret?: boolean; status?: string }, tenantId?: string) {
    const application = await this.requireApplication(applicationId, tenantId);
    if (!['receipt', 'uplink'].includes(eventType)) throw new BadRequestException('eventType only supports receipt or uplink');
    if (!String(data.url ?? '').trim()) {
      await this.prisma.httpWebhookEndpoint.deleteMany({ where: { applicationId, eventType } });
      return {
        applicationId,
        eventType,
        url: '',
        secretLast4: '',
        status: 'inactive',
        updatedAt: new Date(),
        deleted: true,
      };
    }
    const url = await validateWebhookUrl(data.url, application.httpConfig?.requireHttps ?? true);
    const existing = await this.prisma.httpWebhookEndpoint.findUnique({ where: { applicationId_eventType: { applicationId, eventType } } });
    const secret = !existing || data.rotateSecret ? randomBytes(32).toString('base64url') : undefined;
    const endpoint = await this.prisma.httpWebhookEndpoint.upsert({
      where: { applicationId_eventType: { applicationId, eventType } },
      create: { applicationId, eventType, url, status: data.status ?? 'active', secretEncrypted: encryptSecret(secret!), secretLast4: secret!.slice(-4) },
      update: { url, status: data.status ?? existing?.status ?? 'active', ...(secret ? { secretEncrypted: encryptSecret(secret), secretLast4: secret.slice(-4) } : {}) },
      select: { id: true, eventType: true, url: true, secretLast4: true, status: true, updatedAt: true },
    });
    return { ...endpoint, ...(secret ? { secret, secretShownOnce: true } : {}) };
  }

  async sendMessage(auth: OpenApiAuthContext, input: { mobile?: string; content?: string; clientMessageId?: string }, meta: { idempotencyKey?: string; bodyHash: string; userAgent?: string }) {
    if (!auth.config.sendEnabled) throw new ForbiddenException({ code: 'SEND_NOT_ENABLED', message: '该应用未开通HTTP短信发送' });
    const mobile = String(input.mobile ?? '').trim();
    const content = String(input.content ?? '');
    if (!/^1[3-9]\d{9}$/.test(mobile)) throw new BadRequestException({ code: 'MOBILE_INVALID', message: '手机号格式非法' });
    if (!content.trim()) throw new BadRequestException({ code: 'CONTENT_REQUIRED', message: '短信内容不能为空' });
    const idempotencyKey = String(meta.idempotencyKey ?? '').trim();
    if (!/^[A-Za-z0-9._:-]{8,128}$/.test(idempotencyKey)) throw new BadRequestException({ code: 'IDEMPOTENCY_KEY_INVALID', message: 'Idempotency-Key 必填且长度为8至128位' });
    const existing = await this.prisma.openApiRequest.findUnique({ where: { applicationId_idempotencyKey: { applicationId: auth.application.id, idempotencyKey } } });
    if (existing) {
      if (existing.bodyHash !== meta.bodyHash) throw new ConflictException({ code: 'IDEMPOTENCY_CONFLICT', message: '同一Idempotency-Key对应的请求内容不一致' });
      if (existing.status === 'completed' && existing.responseBody) return existing.responseBody;
      if (existing.status === 'failed' && existing.responseBody && existing.httpStatus) throw new HttpException(existing.responseBody as Record<string, unknown>, existing.httpStatus);
      throw new ConflictException({ code: 'REQUEST_PROCESSING', message: '同一请求正在处理中，请稍后查询' });
    }
    if (input.clientMessageId) {
      const duplicateClientMessage = await this.prisma.smsMessageRecord.findFirst({ where: { applicationId: auth.application.id, clientMessageId: input.clientMessageId }, select: { messageId: true } });
      if (duplicateClientMessage) throw new ConflictException({ code: 'CLIENT_MESSAGE_ID_CONFLICT', message: `clientMessageId已关联短信 ${duplicateClientMessage.messageId}` });
    }
    const requestId = `req_${randomUUID()}`;
    const startedAt = Date.now();
    let request;
    try {
      request = await this.prisma.openApiRequest.create({
        data: { tenantId: auth.application.tenantId, applicationId: auth.application.id, credentialId: auth.credentialId, requestId, idempotencyKey, bodyHash: meta.bodyHash, clientMessageId: input.clientMessageId, sourceIp: auth.sourceIp, userAgent: meta.userAgent },
      });
    } catch (error) {
      if ((error as { code?: string }).code === 'P2002') {
        const raced = await this.prisma.openApiRequest.findUnique({ where: { applicationId_idempotencyKey: { applicationId: auth.application.id, idempotencyKey } } });
        if (raced?.bodyHash !== meta.bodyHash) throw new ConflictException({ code: 'IDEMPOTENCY_CONFLICT', message: '同一Idempotency-Key对应的请求内容不一致' });
        if (raced?.status === 'completed' && raced.responseBody) return raced.responseBody;
        if (raced?.status === 'failed' && raced.responseBody && raced.httpStatus) throw new HttpException(raced.responseBody as Record<string, unknown>, raced.httpStatus);
        throw new ConflictException({ code: 'REQUEST_PROCESSING', message: '同一请求正在处理中，请稍后查询' });
      }
      throw error;
    }
    try {
      const task = await this.sendChain.createHttpBatchTask({
        tenantId: auth.application.tenantId,
        applicationId: auth.application.id,
        content,
        phones: [mobile],
        sourceIp: auth.sourceIp,
        userAgent: meta.userAgent,
        clientMessageId: input.clientMessageId,
      });
      const message = task.messages?.[0];
      if (task.status === 'rejected' || message?.status === 'rejected') {
        throw new UnprocessableEntityException({ code: 'SEND_REJECTED', message: message?.errorMessage ?? task.rejectReason ?? '短信未通过业务校验' });
      }
      const response = { code: 'ACCEPTED', requestId, messageId: message?.messageId, clientMessageId: input.clientMessageId ?? null, status: message?.status ?? task.status, acceptedAt: new Date().toISOString() };
      await this.prisma.openApiRequest.update({ where: { id: request.id }, data: { status: 'completed', httpStatus: 202, businessCode: 'ACCEPTED', responseBody: response, messageRecordId: message?.id, durationMs: Date.now() - startedAt, completedAt: new Date() } });
      this.protocolLogs?.record({
        protocol: 'http',
        direction: 'client_to_platform',
        eventType: 'send_request',
        status: 'accepted',
        tenantId: auth.application.tenantId,
        applicationId: auth.application.id,
        messageId: message?.messageId,
        requestId,
        phone: mobile,
        resultCode: 'ACCEPTED',
        durationMs: Date.now() - startedAt,
        payloadBytes: Buffer.byteLength(content, 'utf8'),
        detail: { clientMessageId: input.clientMessageId },
      });
      return response;
    } catch (error) {
      let outwardError = error;
      if (error instanceof HttpException && error.getStatus() === 400) {
        const response = error.getResponse();
        const message = typeof response === 'object' && response && 'message' in response ? (response as { message: unknown }).message : error.message;
        outwardError = new UnprocessableEntityException({ code: 'SEND_REJECTED', message });
      }
      const failure = normalizeOpenApiFailure(outwardError);
      await this.prisma.openApiRequest.update({ where: { id: request.id }, data: { status: 'failed', httpStatus: failure.httpStatus, businessCode: failure.code, responseBody: failure.responseBody, durationMs: Date.now() - startedAt, completedAt: new Date() } });
      this.protocolLogs?.record({
        protocol: 'http',
        direction: 'client_to_platform',
        eventType: 'send_request',
        status: 'failed',
        tenantId: auth.application.tenantId,
        applicationId: auth.application.id,
        requestId,
        phone: mobile,
        resultCode: failure.code,
        durationMs: Date.now() - startedAt,
        payloadBytes: Buffer.byteLength(content, 'utf8'),
      });
      throw outwardError;
    }
  }

  async getMessage(auth: OpenApiAuthContext, messageId: string) {
    if (!auth.config.messageQueryEnabled) throw new ForbiddenException({ code: 'MESSAGE_QUERY_NOT_ENABLED', message: '该应用未开通短信状态查询' });
    const message = await this.prisma.smsMessageRecord.findFirst({
      where: { applicationId: auth.application.id, OR: [{ messageId }, { clientMessageId: messageId }] },
      select: { messageId: true, clientMessageId: true, phoneNumber: true, status: true, submitStatus: true, receiptStatus: true, errorCode: true, errorMessage: true, queuedAt: true, submittedAt: true, deliveredAt: true, updatedAt: true },
    });
    if (!message) throw new NotFoundException({ code: 'MESSAGE_NOT_FOUND', message: '短信记录不存在' });
    return message;
  }

  async listUplinks(auth: OpenApiAuthContext, query: Record<string, string | undefined>) {
    if (!auth.config.uplinkQueryEnabled) throw new ForbiddenException({ code: 'UPLINK_QUERY_NOT_ENABLED', message: '该应用未开通上行查询' });
    const endTime = query.endTime ? new Date(query.endTime) : new Date();
    const startTime = query.startTime ? new Date(query.startTime) : new Date(endTime.getTime() - 24 * 3600_000);
    if (!Number.isFinite(startTime.getTime()) || !Number.isFinite(endTime.getTime()) || startTime > endTime) throw new BadRequestException({ code: 'TIME_RANGE_INVALID', message: '查询时间范围非法' });
    if (endTime.getTime() - startTime.getTime() > auth.config.maxQueryRangeDays * 86400_000) throw new BadRequestException({ code: 'TIME_RANGE_TOO_LARGE', message: `单次查询不能超过${auth.config.maxQueryRangeDays}天` });
    const limit = Math.min(Math.max(Number(query.limit) || 50, 1), auth.config.maxPageSize);
    const cursor = decodeCursor(query.cursor);
    const rows = await this.prisma.smsUplinkMessage.findMany({
      where: {
        applicationId: auth.application.id,
        matchStatus: 'matched',
        receivedAt: { gte: startTime, lte: endTime },
        phoneNumber: query.mobile,
        destId: query.accessNumber,
        content: query.keyword ? { contains: query.keyword } : undefined,
        ...(cursor ? { OR: [{ receivedAt: { lt: cursor.receivedAt } }, { receivedAt: cursor.receivedAt, id: { lt: cursor.id } }] } : {}),
      },
      select: { id: true, messageId: true, phoneNumber: true, destId: true, content: true, matchStatus: true, matchReason: true, receivedAt: true },
      orderBy: [{ receivedAt: 'desc' }, { id: 'desc' }],
      take: limit + 1,
    });
    const hasMore = rows.length > limit;
    const items = rows.slice(0, limit);
    const last = items.at(-1);
    return { items, nextCursor: hasMore && last ? encodeCursor(last.receivedAt, last.id) : null };
  }

  async getUplink(auth: OpenApiAuthContext, uplinkId: string) {
    if (!auth.config.uplinkQueryEnabled) throw new ForbiddenException({ code: 'UPLINK_QUERY_NOT_ENABLED', message: '该应用未开通上行查询' });
    const row = await this.prisma.smsUplinkMessage.findFirst({ where: { id: uplinkId, applicationId: auth.application.id, matchStatus: 'matched' } });
    if (!row) throw new NotFoundException({ code: 'UPLINK_NOT_FOUND', message: '上行记录不存在' });
    return row;
  }

  async queueWebhookEvent(data: { tenantId: string; applicationId?: string | null; messageRecordId?: string | null; messageId?: string | null; uplinkMessageId?: string | null; eventType: 'receipt' | 'uplink'; payload: Record<string, unknown> }) {
    if (!data.applicationId) return null;
    const application = await this.prisma.smsApplication.findUnique({ where: { id: data.applicationId }, include: { httpConfig: true } });
    const config = application?.httpConfig;
    const enabled = data.eventType === 'receipt' ? config?.receiptWebhookEnabled : config?.uplinkWebhookEnabled;
    if (!config?.enabled || !enabled) return null;
    const endpoint = await this.prisma.httpWebhookEndpoint.findUnique({ where: { applicationId_eventType: { applicationId: data.applicationId, eventType: data.eventType } } });
    if (!endpoint || endpoint.status !== 'active') return null;
    const eventId = data.eventType === 'receipt' && data.messageRecordId
      ? `evt_receipt_${data.messageRecordId}`
      : data.eventType === 'uplink' && data.uplinkMessageId
        ? `evt_uplink_${data.uplinkMessageId}`
        : `evt_${randomUUID()}`;
    const event = await this.prisma.httpWebhookEvent.upsert({
      where: { eventId },
      update: {},
      create: { eventId, tenantId: data.tenantId, applicationId: data.applicationId, eventType: data.eventType, messageRecordId: data.messageRecordId, messageId: data.messageId, uplinkMessageId: data.uplinkMessageId, payload: data.payload as Prisma.InputJsonValue },
    });
    const delivery = await this.prisma.httpWebhookDelivery.upsert({
      where: { eventId_endpointId: { eventId: event.id, endpointId: endpoint.id } },
      update: {},
      create: { eventId: event.id, endpointId: endpoint.id },
    });
    if (delivery.status === 'delivered') return delivery;
    await this.queue?.add('deliver', { deliveryId: delivery.id }, { jobId: delivery.id, removeOnComplete: 1000, removeOnFail: 1000 });
    return delivery;
  }

  async listRequestLogs(applicationId: string, tenantId?: string) {
    await this.requireApplication(applicationId, tenantId);
    return this.prisma.openApiRequest.findMany({ where: { applicationId }, select: { id: true, requestId: true, clientMessageId: true, sourceIp: true, httpStatus: true, businessCode: true, status: true, durationMs: true, createdAt: true, completedAt: true }, orderBy: { createdAt: 'desc' }, take: 100 });
  }

  async listWebhookDeliveries(applicationId: string, tenantId?: string) {
    await this.requireApplication(applicationId, tenantId);
    return this.prisma.httpWebhookDelivery.findMany({ where: { event: { applicationId } }, include: { event: true, endpoint: { select: { eventType: true, url: true } }, attempts: { orderBy: { attemptNo: 'desc' }, take: 5 } }, orderBy: { createdAt: 'desc' }, take: 100 });
  }

  async retryWebhookDelivery(applicationId: string, deliveryId: string, tenantId?: string) {
    const application = await this.requireApplication(applicationId, tenantId);
    if (tenantId && !application.httpConfig?.allowClientManualRetry) throw new ForbiddenException('该应用未开通客户端手动重投');
    const delivery = await this.prisma.httpWebhookDelivery.findFirst({ where: { id: deliveryId, event: { applicationId } } });
    if (!delivery) throw new NotFoundException('Webhook投递记录不存在');
    await this.prisma.httpWebhookDelivery.update({ where: { id: delivery.id }, data: { status: 'pending', nextRetryAt: null, lastError: null } });
    await this.queue?.add('deliver', { deliveryId }, { jobId: `${deliveryId}:manual:${Date.now()}`, removeOnComplete: 1000, removeOnFail: 1000 });
    return { id: deliveryId, status: 'pending' };
  }

  private async deliverWebhook(deliveryId: string) {
    const delivery = await this.prisma.httpWebhookDelivery.findUnique({ where: { id: deliveryId }, include: { event: true, endpoint: true } });
    if (!delivery || delivery.status === 'delivered') return;
    const config = await this.prisma.smsApplicationHttpConfig.findUnique({ where: { applicationId: delivery.event.applicationId } });
    if (!config) return;
    const attemptNo = delivery.attemptCount + 1;
    const timestamp = String(Math.floor(Date.now() / 1000));
    const body = JSON.stringify({ eventId: delivery.event.eventId, eventType: delivery.event.eventType, occurredAt: delivery.event.createdAt.toISOString(), data: delivery.event.payload });
    const signature = createHmac('sha256', decryptSecret(delivery.endpoint.secretEncrypted)).update(`${timestamp}\n${body}`).digest('hex');
    const startedAt = Date.now();
    let responseStatus: number | undefined;
    let responseSummary: string | undefined;
    let errorMessage: string | undefined;
    try {
      const response = await postWebhook(delivery.endpoint.url, body, {
        'content-type': 'application/json',
        'x-event-id': delivery.event.eventId,
        'x-event-type': delivery.event.eventType,
        'x-timestamp': timestamp,
        'x-signature': `sha256=${signature}`,
      }, config.webhookTimeoutSeconds * 1000, config.requireHttps);
      responseStatus = response.status;
      responseSummary = response.body;
    } catch (error) { errorMessage = error instanceof Error ? error.message : 'Webhook request failed'; }
    const success = responseStatus !== undefined && responseStatus >= 200 && responseStatus < 300;
    const retryable = errorMessage !== undefined || responseStatus === 408 || responseStatus === 429 || (responseStatus !== undefined && responseStatus >= 500);
    await this.prisma.httpWebhookAttempt.create({ data: { deliveryId, attemptNo, responseStatus, responseSummary, errorMessage, durationMs: Date.now() - startedAt, requestHeaders: { 'x-event-id': delivery.event.eventId, 'x-event-type': delivery.event.eventType, 'x-timestamp': timestamp, 'x-signature': 'sha256=***' } } });
    this.protocolLogs?.record({
      protocol: 'http',
      direction: 'platform_to_client',
      eventType: `${delivery.event.eventType}_webhook`,
      status: success ? 'success' : retryable ? 'retrying' : 'failed',
      tenantId: delivery.event.tenantId,
      applicationId: delivery.event.applicationId,
      messageId: delivery.event.messageId,
      requestId: delivery.event.eventId,
      resultCode: responseStatus ?? 'NETWORK_ERROR',
      durationMs: Date.now() - startedAt,
      payloadBytes: Buffer.byteLength(body, 'utf8'),
      retryCount: attemptNo - 1,
      detail: { deliveryId, attemptNo, error: errorMessage },
    });
    if (success) {
      await this.prisma.httpWebhookDelivery.update({ where: { id: deliveryId }, data: { status: 'delivered', attemptCount: attemptNo, lastHttpStatus: responseStatus, lastError: null, deliveredAt: new Date(), nextRetryAt: null } });
      return;
    }
    const maxAttempts = Math.min(config.webhookMaxAttempts, RETRY_DELAYS_SECONDS.length);
    if (config.webhookRetryEnabled && retryable && attemptNo < maxAttempts) {
      const delaySeconds = RETRY_DELAYS_SECONDS[attemptNo] ?? RETRY_DELAYS_SECONDS.at(-1)!;
      const nextRetryAt = new Date(Date.now() + delaySeconds * 1000);
      await this.prisma.httpWebhookDelivery.update({ where: { id: deliveryId }, data: { status: 'retrying', attemptCount: attemptNo, lastHttpStatus: responseStatus, lastError: errorMessage ?? `HTTP ${responseStatus}`, nextRetryAt } });
      await this.queue?.add('deliver', { deliveryId }, { jobId: `${deliveryId}:${attemptNo + 1}`, delay: delaySeconds * 1000, removeOnComplete: 1000, removeOnFail: 1000 });
      return;
    }
    await this.prisma.httpWebhookDelivery.update({ where: { id: deliveryId }, data: { status: 'failed', attemptCount: attemptNo, lastHttpStatus: responseStatus, lastError: errorMessage ?? `HTTP ${responseStatus}`, nextRetryAt: null } });
  }

  private async requireApplication(applicationId: string, tenantId?: string) {
    const application = await this.prisma.smsApplication.findFirst({ where: { id: applicationId, tenantId }, include: { httpConfig: true, httpIpAllowlist: true } });
    if (!application) throw new NotFoundException('企业应用不存在');
    return application;
  }
}

function httpApiPublicOrigin() {
  const configured = process.env.HTTP_API_PUBLIC_ORIGIN?.trim().replace(/\/+$/, '');
  if (!configured) return undefined;
  const url = new URL(configured);
  if (url.protocol !== 'https:' || url.username || url.password || url.pathname !== '/' || url.search || url.hash) {
    // This value is copied into customer integration parameters, so fail closed instead of
    // publishing an insecure or path-dependent endpoint when deployment config is wrong.
    throw new Error('HTTP_API_PUBLIC_ORIGIN必须是无路径、无凭据的HTTPS源地址');
  }
  return url.origin;
}

function normalizeOpenApiFailure(error: unknown) {
  if (error instanceof HttpException) {
    const value = error.getResponse();
    const object = typeof value === 'object' && value ? value as Record<string, unknown> : {};
    const rawMessage = object.message ?? error.message;
    return {
      httpStatus: error.getStatus(),
      code: String(object.code ?? 'SEND_REJECTED'),
      responseBody: { code: String(object.code ?? 'SEND_REJECTED'), message: Array.isArray(rawMessage) ? rawMessage.join('；') : String(rawMessage) } as Prisma.InputJsonValue,
    };
  }
  return { httpStatus: 500, code: 'INTERNAL_ERROR', responseBody: { code: 'INTERNAL_ERROR', message: 'Internal server error' } as Prisma.InputJsonValue };
}

function normalizeConfig(
  input: HttpConfigInput,
  existing: { enabled?: boolean } | null | undefined,
  cmppEnabled: boolean,
) {
  const enabling = input.enabled === true && existing?.enabled !== true;
  const effective = enabling ? {
    sendEnabled: true,
    messageQueryEnabled: true,
    receiptWebhookEnabled: true,
    uplinkWebhookEnabled: true,
    uplinkQueryEnabled: true,
    credentialSelfServiceEnabled: true,
    ...input,
  } : input;
  const httpEnabled = effective.enabled ?? existing?.enabled ?? false;
  const deliveryMode = automaticDeliveryMode(cmppEnabled, httpEnabled);
  return {
    enabled: effective.enabled,
    sendEnabled: effective.sendEnabled,
    messageQueryEnabled: effective.messageQueryEnabled,
    receiptWebhookEnabled: effective.receiptWebhookEnabled,
    uplinkWebhookEnabled: effective.uplinkWebhookEnabled,
    uplinkQueryEnabled: effective.uplinkQueryEnabled,
    credentialSelfServiceEnabled: effective.credentialSelfServiceEnabled,
    qpsLimit: bounded(effective.qpsLimit, 1, 1000, 'QPS'),
    timestampToleranceSeconds: bounded(effective.timestampToleranceSeconds, 60, 900, '时间戳容差'),
    maxCredentialCount: bounded(effective.maxCredentialCount, 1, 10, '凭据数'),
    uplinkRetentionDays: bounded(effective.uplinkRetentionDays, 1, 365, '上行保留天数'),
    maxQueryRangeDays: bounded(effective.maxQueryRangeDays, 1, 90, '查询跨度'),
    maxPageSize: bounded(effective.maxPageSize, 10, 500, '分页上限'),
    receiptDeliveryMode: deliveryMode,
    uplinkDeliveryMode: deliveryMode,
    webhookRetryEnabled: effective.webhookRetryEnabled,
    webhookMaxAttempts: bounded(effective.webhookMaxAttempts, 1, 7, '回调重试次数'),
    webhookTimeoutSeconds: bounded(effective.webhookTimeoutSeconds, 1, 30, '回调超时'),
    requireHttps: effective.requireHttps,
    allowClientManualRetry: effective.allowClientManualRetry,
    allowClientTest: effective.allowClientTest,
  };
}

function bounded(value: number | undefined, min: number, max: number, label: string) {
  if (value === undefined) return undefined;
  if (!Number.isInteger(value) || value < min || value > max) throw new BadRequestException(`${label}必须在${min}至${max}之间`);
  return value;
}

function normalizeIpAllowlist(values?: string[]) {
  return [...new Set((values ?? []).map((item) => item.trim()).filter(Boolean).map((item) => {
    const [ip, prefix] = item.split('/');
    const version = isIP(ip);
    if (!version) throw new BadRequestException(`IP白名单格式非法：${item}`);
    if (prefix !== undefined) {
      const bits = Number(prefix);
      const max = version === 4 ? 32 : 128;
      if (!Number.isInteger(bits) || bits < 0 || bits > max) throw new BadRequestException(`CIDR格式非法：${item}`);
    }
    return item;
  }))];
}

async function validateWebhookUrl(value: string, requireHttps: boolean) {
  return (await resolveWebhookTarget(value, requireHttps)).url.toString();
}

async function resolveWebhookTarget(value: string, requireHttps: boolean) {
  let url: URL;
  try { url = new URL(String(value ?? '').trim()); } catch { throw new BadRequestException('Webhook URL格式非法'); }
  if (!['http:', 'https:'].includes(url.protocol)) throw new BadRequestException('Webhook仅支持HTTP/HTTPS');
  if (requireHttps && url.protocol !== 'https:') throw new BadRequestException('当前应用要求Webhook使用HTTPS');
  if (url.username || url.password) throw new BadRequestException('Webhook URL不能包含用户名或密码');
  const addresses = isIP(url.hostname) ? [{ address: url.hostname }] : await lookup(url.hostname, { all: true });
  if (addresses.some(({ address }) => isPrivateAddress(address))) throw new BadRequestException('Webhook URL不能指向内网、环回或链路本地地址');
  const selected = addresses[0];
  if (!selected) throw new BadRequestException('Webhook域名未解析到可用地址');
  return { url, address: selected.address, family: isIP(selected.address) };
}

async function postWebhook(urlText: string, body: string, headers: Record<string, string>, timeoutMs: number, requireHttps: boolean) {
  const target = await resolveWebhookTarget(urlText, requireHttps);
  return new Promise<{ status: number; body: string }>((resolve, reject) => {
    const requestFn = target.url.protocol === 'https:' ? httpsRequest : httpRequest;
    const request = requestFn(target.url, {
      method: 'POST',
      headers: { ...headers, 'content-length': String(Buffer.byteLength(body)) },
      lookup: (_hostname, _options, callback) => callback(null, target.address, target.family),
    }, (response) => {
      const chunks: Buffer[] = [];
      let size = 0;
      response.on('data', (chunk: Buffer) => {
        if (size < 1000) {
          const buffer = Buffer.from(chunk);
          chunks.push(buffer.subarray(0, 1000 - size));
          size += buffer.length;
        }
      });
      response.on('end', () => resolve({ status: response.statusCode ?? 0, body: Buffer.concat(chunks).toString('utf8') }));
    });
    request.setTimeout(timeoutMs, () => request.destroy(new Error('Webhook request timed out')));
    request.on('error', reject);
    request.end(body);
  });
}

function isPrivateAddress(address: string) {
  const normalized = address.replace(/^::ffff:/, '');
  if (normalized === '::1' || normalized === '::' || normalized.startsWith('fc') || normalized.startsWith('fd') || normalized.startsWith('fe8') || normalized.startsWith('fe9') || normalized.startsWith('fea') || normalized.startsWith('feb')) return true;
  if (isIP(normalized) !== 4) return false;
  const [a, b] = normalized.split('.').map(Number);
  return a === 10 || a === 127 || a === 0 || (a === 169 && b === 254) || (a === 172 && b >= 16 && b <= 31) || (a === 192 && b === 168) || (a === 100 && b >= 64 && b <= 127);
}

function encodeCursor(receivedAt: Date, id: string) { return Buffer.from(JSON.stringify([receivedAt.toISOString(), id])).toString('base64url'); }
function decodeCursor(value?: string) {
  if (!value) return null;
  try {
    const [date, id] = JSON.parse(Buffer.from(value, 'base64url').toString('utf8')) as [string, string];
    const receivedAt = new Date(date);
    if (!id || !Number.isFinite(receivedAt.getTime())) throw new Error();
    return { receivedAt, id };
  } catch { throw new BadRequestException({ code: 'CURSOR_INVALID', message: 'cursor格式非法' }); }
}

function bullmqConnection() {
  const url = new URL(process.env.REDIS_URL ?? 'redis://127.0.0.1:6379');
  return { host: url.hostname, port: Number(url.port || 6379), username: url.username || undefined, password: url.password || undefined, db: Number(url.pathname.slice(1) || 0), maxRetriesPerRequest: null as null };
}