import { Injectable, Logger } from '@nestjs/common';
import { CrmPrismaService } from '../prisma/crm-prisma.service';
import { RedisService } from '../redis/redis.service';
import { VisibilityLevel } from '../common/utils/build-visibility-filter';

const CACHE_PREFIX = 'crm_visibility';
const CACHE_TTL = 300; // 5 Minuten

@Injectable()
export class VisibilityService {
  private readonly logger = new Logger(VisibilityService.name);

  constructor(
    private readonly prisma: CrmPrismaService,
    private readonly redis: RedisService,
  ) {}

  /**
   * Sichtbarkeitslevel fuer eine Entity abrufen (mit Redis-Cache).
   * Default: ALL (bestehendes Verhalten bleibt erhalten).
   */
  async getLevel(
    tenantId: string,
    entity: string,
  ): Promise<VisibilityLevel> {
    const cacheKey = `${CACHE_PREFIX}:${tenantId}:${entity}`;

    // Cache pruefen
    const cached = await this.redis.get(cacheKey);
    if (cached) {
      return cached as VisibilityLevel;
    }

    // Aus DB laden
    const setting = await this.prisma.crmVisibilitySetting.findUnique({
      where: { tenantId_entity: { tenantId, entity } },
    });

    const level = (setting?.level as VisibilityLevel) ?? 'ALL';

    // In Cache schreiben
    await this.redis.set(cacheKey, level, CACHE_TTL);

    return level;
  }

  /**
   * Sichtbarkeitslevel fuer eine Entity setzen.
   */
  async setLevel(
    tenantId: string,
    entity: string,
    level: VisibilityLevel,
  ): Promise<void> {
    await this.prisma.crmVisibilitySetting.upsert({
      where: { tenantId_entity: { tenantId, entity } },
      update: { level },
      create: { tenantId, entity, level },
    });

    // Cache invalidieren
    const cacheKey = `${CACHE_PREFIX}:${tenantId}:${entity}`;
    await this.redis.del(cacheKey);

    this.logger.log(
      `Visibility fuer ${entity} auf ${level} gesetzt (Tenant: ${tenantId})`,
    );
  }

  /**
   * Alle Sichtbarkeitslevels fuer einen Tenant abrufen.
   */
  async getAllLevels(
    tenantId: string,
  ): Promise<Record<string, VisibilityLevel>> {
    const settings = await this.prisma.crmVisibilitySetting.findMany({
      where: { tenantId },
    });

    const result: Record<string, VisibilityLevel> = {
      COMPANY: 'ALL',
      CONTACT: 'ALL',
      DEAL: 'ALL',
      ACTIVITY: 'ALL',
    };

    for (const s of settings) {
      result[s.entity] = s.level as VisibilityLevel;
    }

    return result;
  }
}