import { BadRequestException, Injectable, Logger, NotFoundException, OnModuleDestroy, OnModuleInit } from '@nestjs/common';
import { Queue } from 'bullmq';
import IORedis from 'ioredis';
import { Prisma } from '@prisma/client';
import { randomUUID } from 'crypto';
import { assertMoneyUnits, moneyToNumber } from '../common/money';
import { PrismaService } from '../prisma/prisma.service';
import type { CreateChannelDto, UpdateChannelDto, CreateChannelGroupDto, CreateChannelGroupItemDto, UpdateChannelGroupDto, CreateRouteRuleDto, CreateReportFieldDto, ReplaceReportFieldsDto, CreateReportMaterialDto, CreateReportTaskDto, ChangeReportTaskStatusesDto, CreateReportExportDto, CreateReceiptImportDto, UpsertConnectionStateDto, ChangeChannelStatusDto, CopyChannelDto, TestChannelDto } from './channels.contracts';
import { GATEWAY_CONNECTION_QUEUE, GATEWAY_SUBMIT_QUEUE, GATEWAY_SUBMIT_STREAM, DEFAULT_GATEWAY_CONTROL_URL, DEFAULT_CHANNEL_CONNECTION_ID, DEFAULT_CONNECTING_TIMEOUT_MS, DEFAULT_CONNECTING_TIMEOUT_SCAN_MS, DEFAULT_GATEWAY_STARTUP_RECONNECT_DELAY_MS, DEFAULT_GATEWAY_RECONCILE_INTERVAL_MS, DEFAULT_GATEWAY_CONTROL_TIMEOUT_MS, DEFAULT_HEARTBEAT_INTERVAL_SECONDS, DEFAULT_HEARTBEAT_MISS_THRESHOLD, HEARTBEAT_AUDIT_INTERVAL_MS, CONNECTING_TIMEOUT_ERROR, DEFAULT_CMPP_VERSION, normalizeTestPhones, normalizeTestContent, calculateBillingUnits, buildChannelTestSubmitCommand, getConfigValue, getStringConfigValue, normalizeConnectionAction, normalizeCmppVersion, normalizeGatewayConnectionStatus, defaultChannelConnectionId, getDesiredConnections, ChannelConnectionSettings, getRuntimeConfigInteger, channelConnectionSettingsChanged, channelGroupAuditSnapshot, normalizeChannelRuntimeConfig, normalizeCmppServiceId, normalizeChannelRateLimit, normalizeExtensionDigits, getPositiveRuntimeInteger, bullmqConnection, getPositiveIntegerEnv, parseReceiptContent, splitReceiptLine, stripReceiptCell, findReceiptStatusIndex, normalizeReceiptStatus, deriveReceiptStatus, ChannelReportDeliveryRow, summarizeChannelReportDelivery, sumReportDelivery, percentage, latestDate, currentShanghaiDayRange, normalizeRetryTimeLimitMinutes, normalizeSpreadsheetSize, normalizeBusinessCarrier, normalizeChannelCarrier, normalizeChannelCarriers, legacyCarrierFromCapabilities, isChannelCarrierCompatible, normalizeRegion, isRegionCompatible, validateGroupItems, normalizeReportType, summarizeReportStatuses, normalizeLinkEvent } from './channels.helpers';
import { ChannelConnectionService } from './channel-connection.service';

/** R5 channel domain service composed behind ChannelsService. */
export class ChannelConfigurationService {
  constructor(private readonly prisma: PrismaService, private readonly connection: ChannelConnectionService) {}

  listChannels() {
    return this.prisma.smsChannel.findMany({
      include: { connectionStates: true },
      orderBy: { createdAt: 'desc' },
    });
  }

  async listChannelsPage(query: { keyword?: string; carrier?: string; status?: string; page?: number; pageSize?: number }) {
    const page = Math.max(1, Math.floor(Number(query.page) || 1));
    const pageSize = Math.min(100, Math.max(1, Math.floor(Number(query.pageSize) || 10)));
    const where: Prisma.SmsChannelWhereInput = {
      status: query.status && query.status !== 'all' ? query.status : { not: 'deleted' },
      carriers: query.carrier && query.carrier !== 'all' ? { has: normalizeBusinessCarrier(query.carrier) } : undefined,
      name: query.keyword?.trim() ? { contains: query.keyword.trim() } : undefined,
    };
    const candidates = await this.prisma.smsChannel.findMany({ where, select: { id: true, name: true } });
    const total = candidates.length;
    if (total === 0) return { items: [], total, page, pageSize };
    const day = currentShanghaiDayRange();
    const counts = await this.prisma.$queryRaw<Array<{ channelId: string; total: number }>>(Prisma.sql`
      SELECT submit."channelId" AS "channelId", COUNT(*)::integer AS total
      FROM "SmsSubmitRecord" submit
      WHERE submit."channelId" IN (${Prisma.join(candidates.map((channel) => channel.id))})
        AND COALESCE(submit."submittedAt", submit."createdAt") >= ${day.startAt}
        AND COALESCE(submit."submittedAt", submit."createdAt") < ${day.endAt}
        AND submit."submitStatus" IN ('accepted', 'rejected', 'timeout')
      GROUP BY submit."channelId"
    `);
    const countByChannel = new Map(counts.map((row) => [row.channelId, Number(row.total)]));
    // 排序必须发生在分页前，否则只能重排当前页，翻页后会破坏“今日提交量降序”的业务口径。
    const pageIds = candidates
      .sort((left, right) => (countByChannel.get(right.id) ?? 0) - (countByChannel.get(left.id) ?? 0)
        || left.name.localeCompare(right.name, 'zh-CN')
        || left.id.localeCompare(right.id))
      .slice((page - 1) * pageSize, page * pageSize)
      .map((channel) => channel.id);
    const pageItems = await this.prisma.smsChannel.findMany({ where: { id: { in: pageIds } }, include: { connectionStates: true } });
    const itemById = new Map(pageItems.map((item) => [item.id, item]));
    const items = pageIds.flatMap((id) => {
      const item = itemById.get(id);
      return item ? [item] : [];
    });
    return { items, total, page, pageSize };
  }

  async createChannel(data: CreateChannelDto) {
    assertMoneyUnits(data.unitPrice ?? 0, '通道单价');
    const missingFields = ['code', 'name', 'gatewayHost', 'account', 'passwordCipher', 'srcId'].filter((field) => {
      const value = data[field as keyof CreateChannelDto];
      return value === undefined || value === null || value === '';
    });
    if (missingFields.length > 0) {
      throw new BadRequestException(`Missing required channel fields: ${missingFields.join(', ')}`);
    }
    const gatewayPort = Number(data.gatewayPort ?? 7890);
    if (!Number.isInteger(gatewayPort) || gatewayPort <= 0 || gatewayPort > 65535) {
      throw new BadRequestException('gatewayPort must be an integer between 1 and 65535');
    }
    const cmppVersion = normalizeCmppVersion(data.cmppVersion);
    const config = normalizeChannelRuntimeConfig(
      undefined,
      data.config,
      data.desiredConnections,
      data.windowSize,
      data.heartbeatIntervalSeconds,
      data.heartbeatMissThreshold,
    );
    const rateLimitPerSecond = normalizeChannelRateLimit(data.rateLimitPerSecond);
    const carriers = normalizeChannelCarriers(data.carriers, data.carrier);
    const channel = await this.prisma.smsChannel.create({
      data: {
        code: data.code,
        name: data.name,
        carrier: legacyCarrierFromCapabilities(carriers),
        carriers,
        sendRegion: data.sendRegion ?? '全国',
        protocol: 'CMPP',
        gatewayHost: data.gatewayHost,
        gatewayPort,
        enterpriseCode: data.enterpriseCode,
        account: data.account,
        passwordCipher: data.passwordCipher,
        srcId: data.srcId,
        cmppVersion,
        rateLimitPerSecond,
        unitPrice: data.unitPrice ?? 0,
        status: data.status ?? 'active',
        config: config as Prisma.InputJsonValue,
      },
    });
    if (channel.status === 'active') {
      await this.connection.requestChannelConnection(channel, 'channel_created');
    }
    return channel;
  }

  async updateChannel(channelId: string, data: UpdateChannelDto) {
    const channel = await this.prisma.smsChannel.findUnique({ where: { id: channelId } });
    if (!channel) {
      throw new NotFoundException('Channel not found');
    }
    if (data.unitPrice !== undefined) {
      assertMoneyUnits(data.unitPrice, '通道单价');
    }
    const gatewayPort = data.gatewayPort === undefined ? undefined : Number(data.gatewayPort);
    if (gatewayPort !== undefined && (!Number.isInteger(gatewayPort) || gatewayPort <= 0 || gatewayPort > 65535)) {
      throw new BadRequestException('gatewayPort must be an integer between 1 and 65535');
    }
    const cmppVersion = data.cmppVersion === undefined ? undefined : normalizeCmppVersion(data.cmppVersion);
    const config = data.config !== undefined
      || data.desiredConnections !== undefined
      || data.windowSize !== undefined
      || data.heartbeatIntervalSeconds !== undefined
      || data.heartbeatMissThreshold !== undefined
      ? normalizeChannelRuntimeConfig(
        channel.config,
        data.config,
        data.desiredConnections,
        data.windowSize,
        data.heartbeatIntervalSeconds,
        data.heartbeatMissThreshold,
      )
      : undefined;
    const rateLimitPerSecond = data.rateLimitPerSecond === undefined
      ? undefined
      : normalizeChannelRateLimit(data.rateLimitPerSecond);
    const existingCarriers = normalizeChannelCarriers(channel.carriers, channel.carrier);
    const carriers = data.carriers !== undefined || data.carrier !== undefined
      ? normalizeChannelCarriers(data.carriers, data.carrier)
      : existingCarriers;
    if (data.carriers !== undefined || data.carrier !== undefined) {
      const removed = existingCarriers.filter((carrier) => !carriers.includes(carrier));
      if (removed.length) {
        const blockingGroups = await this.prisma.smsChannelGroupItem.findMany({
          where: { channelId, group: { status: 'active', carrier: { in: removed } } },
          include: { group: true },
        });
        if (blockingGroups.length) {
          throw new BadRequestException(`请先解除以下活动通道组引用：${blockingGroups.map((item) => item.group.name).join('、')}`);
        }
      }
    }
    const connectionConfigChanged = channelConnectionSettingsChanged(channel, {
      gatewayHost: data.gatewayHost ?? channel.gatewayHost,
      gatewayPort: gatewayPort ?? channel.gatewayPort,
      account: data.account ?? channel.account,
      passwordCipher: data.passwordCipher ?? channel.passwordCipher,
      cmppVersion: cmppVersion ?? channel.cmppVersion,
      config: config ?? channel.config,
    });
    const updated = await this.prisma.smsChannel.update({
      where: { id: channelId },
      data: {
        code: data.code,
        name: data.name,
        carrier: data.carriers !== undefined || data.carrier !== undefined ? legacyCarrierFromCapabilities(carriers) : undefined,
        carriers: data.carriers !== undefined || data.carrier !== undefined ? carriers : undefined,
        sendRegion: data.sendRegion,
        protocol: 'CMPP',
        gatewayHost: data.gatewayHost,
        gatewayPort,
        enterpriseCode: data.enterpriseCode,
        account: data.account,
        passwordCipher: data.passwordCipher,
        srcId: data.srcId,
        cmppVersion,
        rateLimitPerSecond,
        unitPrice: data.unitPrice,
        status: data.status,
        config: config as Prisma.InputJsonValue | undefined,
      },
    });
    await this.prisma.operationLog.create({
      data: {
        action: 'sms_channel.update',
        resource: 'sms_channel',
        resourceId: channelId,
        detail: {
          before: {
            code: channel.code,
            name: channel.name,
            carrier: channel.carrier,
            carriers: channel.carriers,
            sendRegion: channel.sendRegion,
            gatewayHost: channel.gatewayHost,
            gatewayPort: channel.gatewayPort,
            enterpriseCode: channel.enterpriseCode,
            account: channel.account,
            srcId: channel.srcId,
            unitPrice: moneyToNumber(channel.unitPrice),
          },
          after: data,
        } as Prisma.InputJsonValue,
      },
    });
    const updatedStatus = data.status ?? channel.status;
    if (updatedStatus === 'active' && (connectionConfigChanged || channel.status !== 'active')) {
      await this.connection.requestChannelConnection(updated, 'channel_updated');
    } else if (updatedStatus !== 'active' && channel.status === 'active') {
      await this.connection.requestChannelDisconnection(updated, 'channel_disabled');
    }
    return updated;
  }

  async changeChannelStatus(channelId: string, data: ChangeChannelStatusDto) {
    const channel = await this.prisma.smsChannel.findUnique({ where: { id: channelId } });
    if (!channel) {
      throw new NotFoundException('Channel not found');
    }
    const updated = await this.prisma.smsChannel.update({ where: { id: channelId }, data: { status: data.status } });
    await this.prisma.operationLog.create({
      data: {
        userId: data.operatorId,
        action: `sms_channel.${data.status}`,
        resource: 'sms_channel',
        resourceId: channelId,
        detail: {
          statusBefore: channel.status,
          statusAfter: data.status,
          reason: data.reason,
        } as Prisma.InputJsonValue,
      },
    });
    if (data.status === 'active') {
      await this.connection.requestChannelConnection(updated, 'channel_enabled', data.operatorId);
    } else if (channel.status === 'active' || data.status === 'deleted') {
      await this.connection.requestChannelDisconnection(
        updated,
        data.status === 'deleted' ? 'channel_deleted' : 'channel_disabled',
        data.operatorId,
      );
    }
    return updated;
  }
}