import { Injectable, CanActivate, ExecutionContext } from '@nestjs/common';
import { WsException } from '@nestjs/websockets';
import { Socket } from 'socket.io';
import { BusinessHoursService } from '../business-hours.service';
import { createSocketResponse } from 'src/socket/support-management/dto/eventPayloads.dto';
import { HttpStatus } from '@nestjs/common';

@Injectable()
export class BusinessHoursGuard implements CanActivate {
  constructor(private readonly businessHoursService: BusinessHoursService) {}

  async canActivate(context: ExecutionContext): Promise<boolean> {
    const client = context.switchToWs().getClient<Socket>();
    const status = await this.businessHoursService.isOpen();
    const nextOpen = await this.businessHoursService.getNextOpen();

    if (!status.open) {
      const message =
        status.reason ||
        'Online conversation is not available now. Please try again later.';
      
      const errorResponse = createSocketResponse(
        'ONLINE_CONVERSATION_DISABLED',
        {
          code: 'ONLINE_CONVERSATION_DISABLED',
          message,
          nextOpen: nextOpen?.toISOString() || null,
        },
        message,
        HttpStatus.SERVICE_UNAVAILABLE,
      );

      client.emit('response', errorResponse);
      throw new WsException({
        code: 'ONLINE_CONVERSATION_DISABLED',
        message,
        nextOpen: nextOpen?.toISOString() || null,
      });
    }

    return true;
  }
}