//! gRPC client configuration for connecting to appks core services.
//!
//! Reads the appks address and timeout from environment variables.

use std::env;

/// Configuration for appks gRPC connections.
#[derive(Debug, Clone)]
pub struct RpcConfig {
    /// appks gRPC endpoint, e.g. `http://localhost:50051`.
    pub appks_addr: String,
    /// Connection establishment timeout (seconds).
    pub connect_timeout_secs: u64,
    /// Optional CA certificate PEM path for appks mTLS.
    pub tls_ca_cert_path: Option<String>,
    /// Optional client certificate PEM path for appks mTLS.
    pub tls_client_cert_path: Option<String>,
    /// Optional client private key PEM path for appks mTLS.
    pub tls_client_key_path: Option<String>,
    /// TLS domain name used for certificate verification.
    pub tls_domain_name: Option<String>,
}

impl RpcConfig {
    /// Build config from environment variables with defaults.
    pub fn from_env() -> Self {
        Self {
            appks_addr: env::var("APPKS_GRPC_ADDR")
                .unwrap_or_else(|_| "http://localhost:50051".to_string()),
            connect_timeout_secs: env::var("APPKS_GRPC_TIMEOUT")
                .ok()
                .and_then(|v| v.parse().ok())
                .unwrap_or(10),
            tls_ca_cert_path: env::var("APPKS_GRPC_TLS_CA_CERT").ok(),
            tls_client_cert_path: env::var("APPKS_GRPC_TLS_CLIENT_CERT").ok(),
            tls_client_key_path: env::var("APPKS_GRPC_TLS_CLIENT_KEY").ok(),
            tls_domain_name: env::var("APPKS_GRPC_TLS_DOMAIN").ok(),
        }
    }
}

impl Default for RpcConfig {
    fn default() -> Self {
        Self::from_env()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_default_config() {
        let cfg = RpcConfig {
            appks_addr: "http://localhost:50051".to_string(),
            connect_timeout_secs: 10,
            tls_ca_cert_path: None,
            tls_client_cert_path: None,
            tls_client_key_path: None,
            tls_domain_name: None,
        };
        assert_eq!(cfg.connect_timeout_secs, 10);
        assert!(cfg.appks_addr.starts_with("http"));
    }
}