import {
  ConflictException,
  Injectable,
  NotFoundException,
} from '@nestjs/common';
import { Prisma, ProductType, Tenant } from '@prisma/client';
import { PrismaService } from '../prisma/prisma.service';
import { AuditService } from '../audit/audit.service';
import { AdminNotifyService } from '../notifications/admin-notify.service';
import { CreateTenantDto } from './dto/create-tenant.dto';
import { UpdateTenantDto } from './dto/update-tenant.dto';

@Injectable()
export class TenantsService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly audit: AuditService,
    private readonly notify: AdminNotifyService,
  ) {}

  async findAll(product?: ProductType) {
    const rows = await this.prisma.tenant.findMany({
      where: product ? { product } : undefined,
      orderBy: { nameFa: 'asc' },
      select: {
        id: true,
        product: true,
        slug: true,
        nameFa: true,
        nameEn: true,
        domain: true,
        avatarUrl: true,
        primaryColor: true,
        secondaryColor: true,
        backgroundColor: true,
        nodeServer: true,
        nodeWs: true,
        appUrl: true,
        adminUrl: true,
        appUiConfig: true,
        setting: true,
        uiVariant: true,
        appVersion: true,
        isActive: true,
        notes: true,
        createdAt: true,
        updatedAt: true,
      },
    });

    return rows.map(({ appUiConfig, setting, ...rest }) => ({
      ...rest,
      hasAppUiConfig: Boolean(appUiConfig),
      hasProgramSettings: Boolean(setting),
    }));
  }

  async findOne(id: string) {
    const tenant = await this.prisma.tenant.findUnique({ where: { id } });
    if (!tenant) {
      throw new NotFoundException('نسخه یافت نشد');
    }
    return this.sanitize(tenant);
  }

  async create(dto: CreateTenantDto, userId?: string) {
    try {
      const tenant = await this.prisma.tenant.create({
        data: {
          product: dto.product,
          slug: dto.slug.toLowerCase(),
          nameFa: dto.nameFa,
          nameEn: dto.nameEn,
          domain: this.normalizeDomain(dto.domain),
          avatarUrl: dto.avatarUrl,
          primaryColor: dto.primaryColor,
          secondaryColor: dto.secondaryColor,
          backgroundColor: dto.backgroundColor,
          nodeServer: dto.nodeServer,
          nodeWs: dto.nodeWs,
          appUrl: dto.appUrl,
          adminUrl: dto.adminUrl,
          remoteApiToken: dto.remoteApiToken,
          appUiConfig: dto.appUiConfig
            ? (dto.appUiConfig as Prisma.InputJsonValue)
            : undefined,
          uiVariant:
            dto.product === ProductType.khanegi
              ? dto.uiVariant ?? 'modular'
              : 'modular',
          appVersion: dto.appVersion?.trim() || '1',
          isActive: dto.isActive ?? true,
          notes: dto.notes,
        },
      });

      await this.audit.log({
        action: 'tenant.create',
        entityType: 'tenant',
        entityId: tenant.id,
        tenantId: tenant.id,
        userId,
        after: this.sanitize(tenant) as unknown as Prisma.InputJsonValue,
      });

      this.notify.notifyAdmins(
        `سوپرادمین: نسخه جدید «${tenant.nameFa}» (${tenant.domain}) ایجاد شد.`,
      );

      return this.sanitize(tenant);
    } catch (error) {
      this.handleUnique(error);
      throw error;
    }
  }

  async update(id: string, dto: UpdateTenantDto, userId?: string) {
    const before = await this.prisma.tenant.findUnique({ where: { id } });
    if (!before) {
      throw new NotFoundException('نسخه یافت نشد');
    }

    const brandingChanged =
      (dto.avatarUrl !== undefined && dto.avatarUrl !== before.avatarUrl) ||
      (dto.primaryColor !== undefined && dto.primaryColor !== before.primaryColor) ||
      (dto.secondaryColor !== undefined &&
        dto.secondaryColor !== before.secondaryColor) ||
      (dto.backgroundColor !== undefined &&
        dto.backgroundColor !== before.backgroundColor) ||
      dto.appUiConfig !== undefined ||
      (dto.uiVariant !== undefined && dto.uiVariant !== before.uiVariant) ||
      (dto.nameFa !== undefined && dto.nameFa !== before.nameFa) ||
      (dto.nameEn !== undefined && dto.nameEn !== before.nameEn);

    const explicitVersion =
      dto.appVersion !== undefined ? dto.appVersion.trim() || '1' : undefined;
    const nextAppVersion =
      explicitVersion ??
      (brandingChanged ? this.bumpAppVersion(before.appVersion) : undefined);

    try {
      const tenant = await this.prisma.tenant.update({
        where: { id },
        data: {
          ...(dto.product !== undefined && { product: dto.product }),
          ...(dto.slug !== undefined && { slug: dto.slug.toLowerCase() }),
          ...(dto.nameFa !== undefined && { nameFa: dto.nameFa }),
          ...(dto.nameEn !== undefined && { nameEn: dto.nameEn }),
          ...(dto.domain !== undefined && {
            domain: this.normalizeDomain(dto.domain),
          }),
          ...(dto.avatarUrl !== undefined && { avatarUrl: dto.avatarUrl }),
          ...(dto.primaryColor !== undefined && {
            primaryColor: dto.primaryColor,
          }),
          ...(dto.secondaryColor !== undefined && {
            secondaryColor: dto.secondaryColor,
          }),
          ...(dto.backgroundColor !== undefined && {
            backgroundColor: dto.backgroundColor,
          }),
          ...(dto.nodeServer !== undefined && { nodeServer: dto.nodeServer }),
          ...(dto.nodeWs !== undefined && { nodeWs: dto.nodeWs }),
          ...(dto.appUrl !== undefined && { appUrl: dto.appUrl }),
          ...(dto.adminUrl !== undefined && { adminUrl: dto.adminUrl }),
          ...(dto.remoteApiToken !== undefined && {
            remoteApiToken: dto.remoteApiToken,
          }),
          ...(dto.appUiConfig !== undefined && {
            appUiConfig: dto.appUiConfig as Prisma.InputJsonValue,
          }),
          ...(dto.uiVariant !== undefined && { uiVariant: dto.uiVariant }),
          ...(nextAppVersion !== undefined && {
            appVersion: nextAppVersion,
          }),
          ...(dto.isActive !== undefined && { isActive: dto.isActive }),
          ...(dto.notes !== undefined && { notes: dto.notes }),
        },
      });

      await this.audit.log({
        action: 'tenant.update',
        entityType: 'tenant',
        entityId: tenant.id,
        tenantId: tenant.id,
        userId,
        before: this.sanitize(before) as unknown as Prisma.InputJsonValue,
        after: this.sanitize(tenant) as unknown as Prisma.InputJsonValue,
      });

      const bits: string[] = [];
      if (before.isActive !== tenant.isActive) {
        bits.push(tenant.isActive ? 'فعال شد' : 'غیرفعال شد');
      }
      if (before.appVersion !== tenant.appVersion) {
        bits.push(`ورژن ${before.appVersion} → ${tenant.appVersion}`);
      }
      if (before.nameFa !== tenant.nameFa || before.domain !== tenant.domain) {
        bits.push('هویت/دامنه تغییر کرد');
      }
      this.notify.notifyAdmins(
        bits.length
          ? `سوپرادمین: نسخه «${tenant.nameFa}» — ${bits.join('؛ ')}`
          : `سوپرادمین: نسخه «${tenant.nameFa}» به‌روزرسانی شد.`,
      );

      return this.sanitize(tenant);
    } catch (error) {
      this.handleUnique(error);
      throw error;
    }
  }

  async remove(id: string, userId?: string) {
    const before = await this.prisma.tenant.findUnique({ where: { id } });
    if (!before) {
      throw new NotFoundException('نسخه یافت نشد');
    }

    await this.prisma.tenant.delete({ where: { id } });

    await this.audit.log({
      action: 'tenant.delete',
      entityType: 'tenant',
      entityId: id,
      tenantId: id,
      userId,
      before: this.sanitize(before) as unknown as Prisma.InputJsonValue,
    });

    this.notify.notifyAdmins(
      `سوپرادمین: نسخه «${before.nameFa}» (${before.domain}) حذف شد.`,
    );

    return { ok: true };
  }

  private sanitize(tenant: Tenant) {
    const { remoteApiToken, setting, ...rest } = tenant;
    return {
      ...rest,
      hasRemoteApiToken: Boolean(remoteApiToken),
      hasProgramSettings: Boolean(setting),
    };
  }

  private normalizeDomain(domain: string) {
    return domain
      .trim()
      .toLowerCase()
      .replace(/^https?:\/\//, '')
      .replace(/\/$/, '');
  }

  /** با تغییر برندینگ، get_user کش فرانت با get_version باطل شود */
  private bumpAppVersion(current?: string | null): string {
    const v = String(current || '1').trim() || '1';
    if (/^\d+$/.test(v)) {
      return String(Number(v) + 1);
    }
    const semver = v.match(/^(\d+)\.(\d+)\.(\d+)$/);
    if (semver) {
      return `${semver[1]}.${semver[2]}.${Number(semver[3]) + 1}`;
    }
    return `${Date.now()}`;
  }

  private handleUnique(error: unknown) {
    if (
      error instanceof Prisma.PrismaClientKnownRequestError &&
      error.code === 'P2002'
    ) {
      throw new ConflictException('slug یا domain تکراری است');
    }
  }
}