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

export interface CreateTenantDto {
  name: string;
  code?: string;
  status?: string;
  creditCode?: string;
  province?: string;
  city?: string;
  address?: string;
  contactName?: string;
  contactIdCard?: string;
  contactPhone?: string;
  contactEmail?: string;
  photoFileObjectId?: string;
}

export interface UpdateTenantDto {
  name?: string;
  code?: string;
  status?: string;
  creditCode?: string;
  province?: string;
  city?: string;
  address?: string;
  contactName?: string;
  contactIdCard?: string;
  contactPhone?: string;
  contactEmail?: string;
  photoFileObjectId?: string;
}

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

  list() {
    return this.prisma.tenant.findMany({
      include: { enterpriseCertifications: { orderBy: { submittedAt: 'desc' }, take: 1 } },
      orderBy: { createdAt: 'desc' },
      take: 100,
    }).then((items) => items.map(withEnterpriseProfile));
  }

  async listManagementRows() {
    const sinceToday = startOfToday();
    const [tenants, accounts, todaySpendGroups] = await Promise.all([
      this.prisma.tenant.findMany({
        where: { status: { not: 'deleted' } },
        include: { enterpriseCertifications: { orderBy: { submittedAt: 'desc' }, take: 1 } },
        orderBy: { createdAt: 'desc' },
        take: 100,
      }),
      this.prisma.tenantAccount.findMany({ take: 200 }),
      this.prisma.smsMessageRecord.groupBy({
        by: ['tenantId'],
        where: { queuedAt: { gte: sinceToday } },
        _sum: { amountCents: true },
      }),
    ]);
    const accountsByTenant = new Map(accounts.map((account) => [account.tenantId, account]));
    const todaySpendByTenant = new Map(todaySpendGroups.map((group) => [group.tenantId, group._sum.amountCents ?? 0]));
    return tenants.map((tenant) => ({
      ...withEnterpriseProfile(tenant),
      account: accountsByTenant.get(tenant.id) ?? null,
      todaySpendCents: todaySpendByTenant.get(tenant.id) ?? 0,
    }));
  }

  get(id: string) {
    return this.prisma.tenant.findUnique({
      where: { id },
      include: { enterpriseCertifications: { orderBy: { submittedAt: 'desc' }, take: 1 } },
    }).then((tenant) => {
      if (!tenant) {
        throw new NotFoundException('Tenant not found');
      }
      return withEnterpriseProfile(tenant);
    });
  }

  async create(data: CreateTenantDto) {
    const code = data.code?.trim() || generateTenantCode(data);
    const tenant = await this.prisma.tenant.create({
      data: { name: data.name, code, status: data.status ?? 'active' },
    });
    await this.upsertProfile(tenant.id, data);
    return this.get(tenant.id);
  }

  async update(id: string, data: UpdateTenantDto) {
    await this.ensureTenant(id);
    await this.prisma.tenant.update({
      where: { id },
      data: {
        name: data.name,
        code: data.code,
        status: data.status,
      },
    });
    await this.upsertProfile(id, data);
    return this.get(id);
  }

  async changeStatus(id: string, status: string) {
    await this.ensureTenant(id);
    return this.prisma.tenant.update({
      where: { id },
      data: { status },
    });
  }

  delete(id: string) {
    return this.changeStatus(id, 'deleted');
  }

  private async ensureTenant(id: string) {
    const tenant = await this.prisma.tenant.findUnique({ where: { id } });
    if (!tenant) {
      throw new NotFoundException('Tenant not found');
    }
    return tenant;
  }

  private async upsertProfile(tenantId: string, data: CreateTenantDto | UpdateTenantDto) {
    const hasProfileData = ['creditCode', 'province', 'city', 'address', 'contactName', 'contactIdCard', 'contactPhone', 'contactEmail', 'photoFileObjectId']
      .some((key) => data[key as keyof (CreateTenantDto | UpdateTenantDto)] !== undefined);
    if (!hasProfileData) {
      return;
    }
    const latest = await this.prisma.enterpriseCertification.findFirst({
      where: { tenantId },
      orderBy: { submittedAt: 'desc' },
    });
    const materials = cleanObject({
      ...(latest?.materials && typeof latest.materials === 'object' && !Array.isArray(latest.materials) ? latest.materials as Record<string, unknown> : {}),
      province: data.province,
      city: data.city,
      address: data.address,
      contactIdCard: data.contactIdCard,
      contactEmail: data.contactEmail,
      photoFileObjectId: data.photoFileObjectId,
    });
    const profileData = {
      companyName: data.name ?? latest?.companyName ?? tenantId,
      licenseNo: data.creditCode,
      contactName: data.contactName,
      contactPhone: data.contactPhone,
      materials: materials as Prisma.InputJsonValue,
      status: 'approved',
    };
    if (latest) {
      await this.prisma.enterpriseCertification.update({
        where: { id: latest.id },
        data: profileData,
      });
      return;
    }
    await this.prisma.enterpriseCertification.create({
      data: { tenantId, ...profileData },
    });
  }
}

function cleanObject(value: Record<string, unknown>) {
  return Object.fromEntries(Object.entries(value).filter(([, item]) => item !== undefined));
}

function withEnterpriseProfile<T extends { enterpriseCertifications?: Array<{ licenseNo?: string | null; contactName?: string | null; contactPhone?: string | null; materials?: Prisma.JsonValue | null }> }>(tenant: T) {
  const [profile] = tenant.enterpriseCertifications ?? [];
  const materials = profile?.materials && typeof profile.materials === 'object' && !Array.isArray(profile.materials)
    ? profile.materials as Record<string, unknown>
    : {};
  const { enterpriseCertifications, ...rest } = tenant;
  return {
    ...rest,
    enterpriseProfile: profile ? {
      creditCode: profile.licenseNo ?? '',
      province: String(materials.province ?? ''),
      city: String(materials.city ?? ''),
      address: String(materials.address ?? ''),
      contactName: profile.contactName ?? '',
      contactIdCard: String(materials.contactIdCard ?? ''),
      contactPhone: profile.contactPhone ?? '',
      contactEmail: String(materials.contactEmail ?? ''),
      photoFileObjectId: String(materials.photoFileObjectId ?? ''),
    } : null,
  };
}

function startOfToday() {
  const date = new Date();
  date.setHours(0, 0, 0, 0);
  return date;
}

function generateTenantCode(data: CreateTenantDto) {
  const source = data.creditCode?.trim() || data.name.trim();
  const normalized = source.replace(/[^\da-zA-Z]/g, '').toLowerCase();
  const suffix = Date.now().toString(36).slice(-6);
  return `ent-${(normalized || 'tenant').slice(0, 18)}-${suffix}`;
}