How to fix auth/invalid-oauth-responsetype: Exactly one OAuth response type must be true in Firebase

// Incorrect - both are true
const config = {
  responseType: {
    code: true,
    idToken: true  // ❌ Only one can be true
  }
};

// Incorrect - both are false
const config = {
  responseType: {
    code: false,
    idToken: false  // ❌ At least one must be true
  }
};

const config = {
  displayName: 'My OIDC Provider',
  enabled: true,
  clientId: 'your-client-id',
  issuer: 'https://your-provider.com',
  responseType: {
    code: true,
    idToken: false
  }
};

await admin.auth().createProviderConfig(config);

const config = {
  displayName: 'My OIDC Provider',
  enabled: true,
  clientId: 'your-client-id',
  issuer: 'https://your-provider.com',
  responseType: {
    code: false,
    idToken: true
  }
};

await admin.auth().createProviderConfig(config);

// ✅ Correct
responseType: {
  code: true,
  idToken: false
}

// ❌ Wrong - incorrect casing
responseType: {
  Code: true,  // Should be lowercase 'code'
  IdToken: false
}

// ❌ Wrong - string instead of boolean
responseType: {
  code: "true",  // Should be boolean true, not string
  idToken: false
}

const admin = require('firebase-admin');

async function createOIDCProvider() {
  try {
    const config = {
      displayName: 'Corporate SSO',
      enabled: true,
      clientId: process.env.OIDC_CLIENT_ID,
      issuer: 'https://auth.example.com',
      responseType: {
        code: true,
        idToken: false
      }
    };

    const provider = await admin.auth().createProviderConfig(config);
    console.log('Provider created successfully:', provider.providerId);
  } catch (error) {
    console.error('Configuration error:', error.message);
  }
}

createOIDCProvider();