import {
  CanActivate,
  ExecutionContext,
  Injectable,
  UnauthorizedException,
} from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { Request } from 'express';
import { UsersService } from '../../users/users.service';

@Injectable()
export class JwtAuthGuard implements CanActivate {
  constructor(
    private readonly jwtService: JwtService,
    private readonly usersService: UsersService,
  ) {}

  async canActivate(context: ExecutionContext): Promise<boolean> {
    const request = context.switchToHttp().getRequest<Request & { user?: unknown }>();
    const authHeader = request.get('authorization');
    const token = authHeader?.startsWith('Bearer ')
      ? authHeader.slice('Bearer '.length)
      : undefined;

    if (!token) {
      throw new UnauthorizedException('Not authenticated');
    }

    try {
      const payload = await this.jwtService.verifyAsync<{ sub: number }>(token);
      const user = await this.usersService.findById(payload.sub);
      if (!user || user.status !== 'active') {
        throw new UnauthorizedException('Not authenticated');
      }

      request.user = user;
      return true;
    } catch {
      throw new UnauthorizedException('Not authenticated');
    }
  }
}