use std::env;
use uuid::Uuid;

/// Agent configuration loaded from environment variables.
#[derive(Debug, Clone)]
pub struct Config {
    pub node_id: Uuid,
    pub cc_url: String,
    pub os_profile: String,
    pub vaultmesh_root: String,
    pub heartbeat_secs: u64,
}

impl Config {
    /// Load configuration from environment variables.
    ///
    /// | Variable                  | Default                    |
    /// |---------------------------|----------------------------|
    /// | VAULTMESH_NODE_ID         | auto-generated UUID        |
    /// | VAULTMESH_CC_URL          | http://127.0.0.1:8088      |
    /// | VAULTMESH_OS_PROFILE      | ArchVault                  |
    /// | VAULTMESH_ROOT            | /var/lib/vaultmesh         |
    /// | VAULTMESH_HEARTBEAT_SECS  | 30                         |
    pub fn from_env() -> Self {
        let node_id = env::var("VAULTMESH_NODE_ID")
            .ok()
            .and_then(|s| s.parse().ok())
            .unwrap_or_else(Uuid::new_v4);

        let cc_url = env::var("VAULTMESH_CC_URL")
            .unwrap_or_else(|_| "http://127.0.0.1:8088".into());

        let os_profile = env::var("VAULTMESH_OS_PROFILE")
            .unwrap_or_else(|_| "ArchVault".into());

        let vaultmesh_root = env::var("VAULTMESH_ROOT")
            .unwrap_or_else(|_| "/var/lib/vaultmesh".into());

        let heartbeat_secs = env::var("VAULTMESH_HEARTBEAT_SECS")
            .ok()
            .and_then(|s| s.parse().ok())
            .unwrap_or(30);

        Self {
            node_id,
            cc_url,
            os_profile,
            vaultmesh_root,
            heartbeat_secs,
        }
    }
}