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

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

  async findAll(params: { page?: number; limit?: number; userId?: string; action?: string } = {}) {
    const { page = 1, limit = 20, userId, action } = params;
    const skip = (page - 1) * limit;

    const where: any = {};
    if (userId) where.userId = userId;
    if (action) where.action = action;

    const [logs, total] = await Promise.all([
      this.prisma.auditLog.findMany({
        where,
        skip,
        take: limit,
        orderBy: { createdAt: 'desc' },
      }),
      this.prisma.auditLog.count({ where }),
    ]);

    return {
      data: logs,
      meta: { total, page, limit, totalPages: Math.ceil(total / limit) },
    };
  }

  async logAction(data: {
    userId?: string;
    action: string;
    entity: string;
    entityId?: string;
    oldValue?: any;
    newValue?: any;
    ipAddress?: string;
    userAgent?: string;
  }) {
    return this.prisma.auditLog.create({ data });
  }
}