import { Injectable } from '@nestjs/common';
import { PrismaService } from '../../infrastructure/database/prisma.service';
import { randomUUID } from 'crypto';

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

  async list(adminUserId: string) {
    return this.prisma.adminConversation.findMany({
      where: { adminUserId, deletedAt: null },
      orderBy: { updatedAt: 'desc' },
      select: { id: true, title: true, createdAt: true, updatedAt: true },
    });
  }

  async create(adminUserId: string, title?: string) {
    const hermesSessionId = randomUUID();
    return this.prisma.adminConversation.create({
      data: { adminUserId, hermesSessionId, title: title || '新对话' },
      select: { id: true, title: true, hermesSessionId: true, createdAt: true },
    });
  }

  async update(id: string, adminUserId: string, title: string) {
    return this.prisma.adminConversation.updateMany({
      where: { id, adminUserId, deletedAt: null },
      data: { title },
    });
  }

  async delete(id: string, adminUserId: string) {
    return this.prisma.adminConversation.updateMany({
      where: { id, adminUserId, deletedAt: null },
      data: { deletedAt: new Date() },
    });
  }

  async getSessionId(conversationId: string, adminUserId: string) {
    const conv = await this.prisma.adminConversation.findFirst({
      where: { id: conversationId, adminUserId, deletedAt: null },
      select: { id: true, hermesSessionId: true },
    });
    return conv?.hermesSessionId ?? null;
  }
}