import { Injectable, UnauthorizedException } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import { ConfigService } from '@nestjs/config';
import { UsersService } from '../../users/users.service.js';
import { JwtPayload } from '../../common/decorators/current-user.decorator.js';

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(
    configService: ConfigService,
    private usersService: UsersService,
  ) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: configService.get<string>('JWT_SECRET') || 'fallback-secret',
    });
  }

  async validate(payload: JwtPayload): Promise<JwtPayload> {
    const user = await this.usersService.findOne(payload.userId);
    if (!user || !user.isActive) {
      throw new UnauthorizedException('User not found or inactive');
    }
    return { userId: payload.userId, email: payload.email, role: payload.role };
  }
}