//! An example code to verify an ID token of the Firebase Auth for signing in user.
//!
//! ```shell
//! $ cargo run --example verify_id_token --features verify -- --email <email> --password <password>
//! ```

use clap::Parser;

#[derive(Parser)]
struct Arguments {
    #[arg(short, long)]
    email: String,
    #[arg(short, long)]
    password: String,
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    #[cfg(not(feature = "verify"))]
    {
        return Err(anyhow::anyhow!(
            "Feature \"verify\" is not enabled.",
        ));
    }

    #[cfg(feature = "verify")]
    {
        use fars::ApiKey;
        use fars::Config;
        use fars::Email;
        use fars::Password;
        use fars::ProjectId;
        use fars::VerificationConfig;

        // Parse the command line arguments.
        let arguments = Arguments::parse();

        // Read API key from the environment variable.
        let api_key = ApiKey::new(std::env::var("FIREBASE_API_KEY")?);

        // Read project ID from the environment variable.
        let project_id = ProjectId::new(std::env::var("FIREBASE_PROJECT_ID")?);

        // Create a config.
        let config = Config::new(api_key);

        // Get a session by signing in with email and password.
        let session = config
            .sign_in_with_email_password(
                Email::new(arguments.email.clone()),
                Password::new(arguments.password.clone()),
            )
            .await?;

        // Create a verification config.
        let config = VerificationConfig::new(project_id);

        // Verify the ID token.
        let claims = config
            .verify_id_token(&session.id_token)
            .await?;

        println!(
            "Token ID verification succeeded: {:?}",
            claims
        );

        return Ok(());
    }
}