import { BadRequestException, Injectable } from '@nestjs/common';
import { Prisma } from '@prisma/client';
import { PrismaService } from '../prisma/prisma.service';

export interface CreatePhoneSegmentDto {
  prefix: string;
  carrier: string;
  province?: string;
  city?: string;
}

export interface PhoneSegmentListQuery {
  keyword?: string;
  page?: number;
  pageSize?: number;
}

export interface CreatePhoneCarrierRuleDto {
  carrier: string;
  pattern: string;
  priority?: number;
  status?: string;
  remark?: string;
}

export interface PageQuery {
  keyword?: string;
  page?: number;
  pageSize?: number;
}

export interface CreateSensitiveWordDto {
  word: string;
  level?: string;
  status?: string;
}

export interface CreateBlacklistDto {
  tenantId?: string;
  applicationId?: string;
  phoneNumber: string;
  reason?: string;
  status?: string;
  operatorId?: string;
}

export interface CreateDrainageFieldDto {
  code: string;
  name: string;
  fieldType: 'string' | 'image' | 'file';
  required?: boolean;
  status?: string;
  description?: string;
}

export interface CreateCommonReportFieldDto {
  drainageFieldId: string;
  reportType: 'signature' | 'drainage';
  required?: boolean;
  sortOrder?: number;
}

export interface DictionaryStatusDto {
  status?: string;
  operatorId?: string;
  reason?: string;
}

export interface DictionaryListQuery {
  tenantId?: string;
  applicationId?: string;
  keyword?: string;
  status?: string;
  enterpriseKeyword?: string;
  applicationKeyword?: string;
  phoneNumber?: string;
  reasonKeyword?: string;
}

@Injectable()
export class DictionariesService {
  constructor(private readonly prisma: PrismaService) {}

  async listPhoneSegments(query: PhoneSegmentListQuery = {}) {
    const page = Math.max(1, Number(query.page ?? 1));
    const pageSize = Math.min(100, Math.max(1, Number(query.pageSize ?? 25)));
    const keyword = query.keyword?.trim();
    const where = keyword ? {
      OR: [
        { prefix: { startsWith: keyword } },
        { carrier: { contains: keyword } },
        { province: { contains: keyword } },
        { city: { contains: keyword } },
      ],
    } : undefined;
    const [items, total] = await Promise.all([
      this.prisma.phoneSegment.findMany({ where, orderBy: { prefix: 'asc' }, skip: (page - 1) * pageSize, take: pageSize }),
      this.prisma.phoneSegment.count({ where }),
    ]);
    return { items, total, page, pageSize };
  }

  createPhoneSegment(data: CreatePhoneSegmentDto) {
    return this.prisma.phoneSegment.create({ data });
  }

  deletePhoneSegment(id: string) {
    return this.prisma.phoneSegment.delete({ where: { id } });
  }

  async listPhoneCarrierRules(query: PageQuery = {}) {
    const page = Math.max(1, Number(query.page ?? 1));
    const pageSize = Math.min(100, Math.max(1, Number(query.pageSize ?? 25)));
    const where = query.keyword?.trim() ? {
      OR: [
        { carrier: { contains: query.keyword.trim() } },
        { pattern: { contains: query.keyword.trim() } },
        { remark: { contains: query.keyword.trim() } },
      ],
    } : undefined;
    const [items, total] = await Promise.all([
      this.prisma.phoneCarrierRule.findMany({ where, orderBy: [{ priority: 'asc' }, { createdAt: 'desc' }], skip: (page - 1) * pageSize, take: pageSize }),
      this.prisma.phoneCarrierRule.count({ where }),
    ]);
    return { items, total, page, pageSize };
  }

  createPhoneCarrierRule(data: CreatePhoneCarrierRuleDto) {
    if (!data.carrier || !data.pattern) {
      throw new BadRequestException('carrier and pattern are required');
    }
    try {
      new RegExp(data.pattern);
    } catch {
      throw new BadRequestException('pattern must be a valid regular expression');
    }
    return this.prisma.phoneCarrierRule.create({
      data: {
        carrier: data.carrier,
        pattern: data.pattern,
        priority: data.priority ?? 100,
        status: data.status ?? 'active',
        remark: data.remark,
      },
    });
  }

  listSensitiveWords(query: DictionaryListQuery = {}) {
    return this.prisma.sensitiveWord.findMany({
      where: {
        status: query.status && query.status !== 'all' ? query.status : undefined,
        OR: query.keyword ? [
          { word: { contains: query.keyword } },
          { level: { contains: query.keyword } },
        ] : undefined,
      },
      orderBy: { createdAt: 'desc' },
    });
  }

  async createSensitiveWord(data: CreateSensitiveWordDto) {
    const created = await this.prisma.sensitiveWord.create({
      data: {
        word: data.word,
        level: data.level ?? 'block',
        status: data.status ?? 'active',
      },
    });
    await this.writeOperationLog(undefined, 'sensitive_word.create', 'sensitive_word', created.id, { word: data.word });
    return created;
  }

  async changeSensitiveWordStatus(id: string, data: DictionaryStatusDto) {
    const status = data.status ?? 'active';
    const updated = await this.prisma.sensitiveWord.update({ where: { id }, data: { status } });
    await this.writeOperationLog(data.operatorId, `sensitive_word.${status}`, 'sensitive_word', id, { reason: data.reason });
    return updated;
  }

  listGlobalBlacklist(query: DictionaryListQuery = {}) {
    return this.prisma.globalBlacklist.findMany({
      where: {
        status: query.status && query.status !== 'all' ? query.status : undefined,
        OR: query.keyword ? [
          { phoneNumber: { contains: query.keyword } },
          { reason: { contains: query.keyword } },
        ] : undefined,
      },
      orderBy: { createdAt: 'desc' },
    });
  }

  async createGlobalBlacklist(data: CreateBlacklistDto) {
    const created = await this.prisma.globalBlacklist.create({
      data: {
        phoneNumber: data.phoneNumber,
        reason: data.reason,
        status: data.status ?? 'active',
      },
    });
    await this.writeOperationLog(data.operatorId, 'global_blacklist.create', 'global_blacklist', created.id, {
      phoneNumber: data.phoneNumber,
      reason: data.reason,
    });
    return created;
  }

  async changeGlobalBlacklistStatus(id: string, data: DictionaryStatusDto) {
    const status = data.status ?? 'active';
    const updated = await this.prisma.globalBlacklist.update({ where: { id }, data: { status } });
    await this.writeOperationLog(data.operatorId, `global_blacklist.${status}`, 'global_blacklist', id, { reason: data.reason });
    return updated;
  }

  listEnterpriseBlacklist(query: DictionaryListQuery = {}) {
    return this.prisma.enterpriseBlacklist.findMany({
      where: {
        tenantId: query.tenantId,
        applicationId: query.applicationId,
        status: query.status && query.status !== 'all' ? query.status : undefined,
        tenant: query.enterpriseKeyword ? { name: { contains: query.enterpriseKeyword } } : undefined,
        application: query.applicationKeyword ? { name: { contains: query.applicationKeyword } } : undefined,
        phoneNumber: query.phoneNumber ? { contains: query.phoneNumber } : undefined,
        reason: query.reasonKeyword ? { contains: query.reasonKeyword } : undefined,
        OR: query.keyword ? [
          { phoneNumber: { contains: query.keyword } },
          { reason: { contains: query.keyword } },
          { tenant: { name: { contains: query.keyword } } },
          { application: { name: { contains: query.keyword } } },
        ] : undefined,
      },
      include: { tenant: true, application: true },
      orderBy: { createdAt: 'desc' },
    });
  }

  async createEnterpriseBlacklist(data: CreateBlacklistDto) {
    if (!data.tenantId || !data.applicationId) {
      throw new BadRequestException('tenantId and applicationId are required for application blacklist');
    }
    const application = await this.prisma.smsApplication.findUnique({
      where: { id: data.applicationId },
      select: { tenantId: true },
    });
    if (!application || application.tenantId !== data.tenantId) {
      throw new BadRequestException('applicationId does not belong to tenantId');
    }
    const createData: Prisma.EnterpriseBlacklistUncheckedCreateInput = {
      tenantId: data.tenantId,
      applicationId: data.applicationId,
      phoneNumber: data.phoneNumber,
      reason: data.reason,
      status: data.status ?? 'active',
    };
    const created = await this.prisma.enterpriseBlacklist.create({ data: createData });
    await this.writeOperationLog(data.operatorId, 'enterprise_blacklist.create', 'enterprise_blacklist', created.id, {
      tenantId: data.tenantId,
      applicationId: data.applicationId,
      phoneNumber: data.phoneNumber,
      reason: data.reason,
    });
    return created;
  }

  async changeEnterpriseBlacklistStatus(id: string, data: DictionaryStatusDto) {
    const status = data.status ?? 'active';
    const updated = await this.prisma.enterpriseBlacklist.update({ where: { id }, data: { status } });
    await this.writeOperationLog(data.operatorId, `enterprise_blacklist.${status}`, 'enterprise_blacklist', id, { reason: data.reason });
    return updated;
  }

  async listDrainageFields() {
    const fields = await this.prisma.drainageField.findMany({
      include: { _count: { select: { channelReportFields: true, commonReportFields: true } } },
      orderBy: { createdAt: 'desc' },
    });
    return fields.map(({ _count, ...field }) => ({
      ...field,
      usageCount: _count.channelReportFields,
      commonUsageCount: _count.commonReportFields,
    }));
  }

  createDrainageField(data: CreateDrainageFieldDto) {
    const code = data.code?.trim();
    if (!code || !/^[A-Za-z0-9]+$/.test(code)) {
      throw new BadRequestException('code must contain only Arabic numerals and English letters');
    }
    if (!['string', 'image', 'file'].includes(data.fieldType)) {
      throw new BadRequestException('fieldType must be string, image or file');
    }
    return this.prisma.drainageField.create({
      data: {
        code,
        name: data.name,
        fieldType: data.fieldType,
        required: data.required ?? false,
        status: data.status ?? 'active',
        description: data.description,
      },
    });
  }

  async deleteDrainageField(id: string) {
    const [usageCount, commonUsageCount] = await Promise.all([
      this.prisma.channelReportField.count({ where: { drainageFieldId: id } }),
      this.prisma.commonReportField.count({ where: { drainageFieldId: id } }),
    ]);
    if (usageCount > 0 || commonUsageCount > 0) {
      throw new BadRequestException(`该字段已被 ${usageCount} 个通道和 ${commonUsageCount} 个通用配置使用，不能删除`);
    }
    return this.prisma.drainageField.delete({ where: { id } });
  }

  listCommonReportFields() {
    return this.prisma.commonReportField.findMany({
      include: { drainageField: true },
      orderBy: [{ reportType: 'asc' }, { sortOrder: 'asc' }, { createdAt: 'asc' }],
    });
  }

  async createCommonReportField(data: CreateCommonReportFieldDto) {
    if (data.reportType !== 'signature' && data.reportType !== 'drainage') {
      throw new BadRequestException('reportType must be signature or drainage');
    }
    const field = await this.prisma.drainageField.findUnique({ where: { id: data.drainageFieldId } });
    if (!field || field.status !== 'active') {
      throw new BadRequestException('报备字段库字段不存在或已停用');
    }
    const existing = await this.prisma.commonReportField.findUnique({
      where: { drainageFieldId_reportType: { drainageFieldId: field.id, reportType: data.reportType } },
    });
    if (existing) {
      throw new BadRequestException('该字段已配置为对应类型的通用字段');
    }
    return this.prisma.commonReportField.create({
      data: {
        drainageFieldId: field.id,
        reportType: data.reportType,
        required: data.required ?? field.required,
        sortOrder: data.sortOrder ?? 100,
        status: 'active',
      },
      include: { drainageField: true },
    });
  }

  deleteCommonReportField(id: string) {
    return this.prisma.commonReportField.delete({ where: { id } });
  }

  private writeOperationLog(userId: string | undefined, action: string, resource: string, resourceId: string, detail: Record<string, unknown>) {
    return this.prisma.operationLog.create({
      data: {
        userId,
        action,
        resource,
        resourceId,
        detail: detail as Prisma.InputJsonValue,
      },
    });
  }
}