import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
import { Document, Types } from 'mongoose';

@Schema({
  timestamps: { createdAt: 'createdAt', updatedAt: false },
  versionKey: false,
  collection: 'audit_logs',
})
export class AuditLogModel extends Document {
  @Prop({ type: Types.ObjectId, ref: 'UserModel', required: false })
  userId?: Types.ObjectId;

  @Prop({ type: String, required: true })
  action: string; // e.g., 'joinRoom', 'sendMessage', 'expertOnline', etc.

  @Prop({ type: String, required: false })
  resource?: string; // e.g., 'Chat', 'Session', 'Expert', 'Message', etc.

  @Prop({ type: String, required: false })
  resourceId?: string; // e.g., sessionId, messageId, expertId, etc.

  @Prop({ type: Object, required: false })
  oldValues?: Record<string, any>; // Previous state before change

  @Prop({ type: Object, required: false })
  newValues?: Record<string, any>; // New state after change

  @Prop({ type: Object, required: false })
  changes?: Record<string, { from: any; to: any }>; // Detailed changes

  @Prop({ type: String, required: false })
  ipAddress?: string;

  @Prop({ type: String, required: false })
  userAgent?: string;

  @Prop({ type: String, required: false })
  method?: string; // For WebSocket: event name, for HTTP: GET, POST, etc.

  @Prop({ type: String, required: false })
  endpoint?: string; // For WebSocket: roomId or path, for HTTP: route path

  @Prop({ type: Number, required: false })
  statusCode?: number; // HTTP status code or success indicator

  @Prop({ type: Object, required: false })
  metadata?: Record<string, any>; // Additional context data

  @Prop({ type: Date, default: Date.now })
  createdAt: Date;
}

export const AuditLogSchema = SchemaFactory.createForClass(AuditLogModel);

// Create index for common queries
AuditLogSchema.index({ userId: 1, createdAt: -1 });
AuditLogSchema.index({ action: 1, createdAt: -1 });
AuditLogSchema.index({ resource: 1, resourceId: 1 });
AuditLogSchema.index({ createdAt: -1 });