import { Injectable } from "@nestjs/common";
import { ConfigService } from "@nestjs/config";
import { PassportStrategy } from "@nestjs/passport";
import { Request } from "express";
import { Strategy } from "passport-jwt";
import { AdminJwtPayload } from "./auth.service";

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(config: ConfigService) {
    const secret = config.get<string>("JWT_SECRET");
    if (!secret) {
      throw new Error("JWT_SECRET must be set (see .env.example).");
    }
    super({
      jwtFromRequest: (req: Request) => {
        const cookieName = config.get<string>("AUTH_COOKIE_NAME") ?? "infobahn_admin_token";
        return req?.cookies?.[cookieName] ?? null;
      },
      ignoreExpiration: false,
      secretOrKey: secret,
    });
  }

  // Whatever this returns becomes `req.user` in guarded routes.
  async validate(payload: AdminJwtPayload) {
    return { id: payload.sub, email: payload.email };
  }
}