import { Injectable } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { Strategy, ExtractJwt } from 'passport-firebase-jwt';
import * as admin from 'firebase-admin';

@Injectable()
export class FirebaseStrategy extends PassportStrategy(Strategy, 'firebase') {
  constructor() {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
    });
    admin.initializeApp({
      credential: admin.credential.cert({
        projectId: process.env.FIREBASE_PROJECT_ID,
        clientEmail: process.env.FIREBASE_CLIENT_EMAIL,
        privateKey: process.env.FIREBASE_PRIVATE_KEY?.replace(/\\n/g, '\n'),
      }),
    });
  }

  async validate(token: string) {
    const decodedToken = await admin.auth().verifyIdToken(token, true);
    return decodedToken;
  }
}