import { CanActivate, ExecutionContext, ForbiddenException, Injectable } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { Request } from 'express';
import { ADMIN_ROLES } from '../../common/enums/role.enum';
import { InquiryType } from '../../common/enums/inquiry-type.enum';
import { INQUIRY_ACCESS_KEY } from '../constants/auth.constants';
import { AuthenticatedUser } from '../interfaces/authenticated-user.interface';

/**
 * Validates that the user may call a specific inquiry endpoint.
 * ADMIN / SUPER_ADMIN bypass — external USER clients need allowedInquiries.
 */
@Injectable()
export class InquiryAccessGuard implements CanActivate {
  constructor(private readonly reflector: Reflector) {}

  canActivate(context: ExecutionContext): boolean {
    const requiredInquiry = this.reflector.getAllAndOverride<InquiryType>(INQUIRY_ACCESS_KEY, [
      context.getHandler(),
      context.getClass(),
    ]);

    if (!requiredInquiry) {
      return true;
    }

    const request = context.switchToHttp().getRequest<Request & { user: AuthenticatedUser }>();
    const user = request.user;

    if (!user) {
      throw new ForbiddenException('Authentication required');
    }

    if (ADMIN_ROLES.includes(user.role)) {
      return true;
    }

    const inquiryKey = requiredInquiry as string;
    if (!user.allowedInquiries.includes(inquiryKey)) {
      throw new ForbiddenException(`Access denied for inquiry: ${inquiryKey}`);
    }

    return true;
  }
}