import { Injectable, NotFoundException, BadRequestException } from '@nestjs/common';
import { PrismaService } from '../../prisma/prisma.service';
import { UpdateFeatureFlagDto } from './dto/update-feature-flag.dto';

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

  async findAll() {
    const flags = await this.prisma.featureFlag.findMany({
      orderBy: { key: 'asc' },
    });
    return flags;
  }

  async findOne(key: string) {
    const flag = await this.prisma.featureFlag.findUnique({
      where: { key },
    });

    if (!flag) {
      throw new NotFoundException(`Feature flag with key "${key}" not found`);
    }

    return flag;
  }

  async update(key: string, dto: UpdateFeatureFlagDto) {
    try {
      const flag = await this.prisma.featureFlag.update({
        where: { key },
        data: {
          enabled: dto.enabled,
          description: dto.description,
        },
      });

      return flag;
    } catch (error) {
      if (error.code === 'P2025') {
        throw new NotFoundException(`Feature flag with key "${key}" not found`);
      }
      throw new BadRequestException(`Failed to update feature flag: ${error.message}`);
    }
  }

  async upsert(key: string, dto: UpdateFeatureFlagDto & { description?: string }) {
    const flag = await this.prisma.featureFlag.upsert({
      where: { key },
      update: {
        enabled: dto.enabled,
        description: dto.description,
      },
      create: {
        key,
        enabled: dto.enabled,
        description: dto.description || null,
      },
    });

    return flag;
  }
}