use crate::vfs::{VfsBackend, VfsError};
use std::path::PathBuf;
use std::sync::Arc;

pub struct NfsVfsServer {
    vfs: Arc<dyn VfsBackend>,
    root: PathBuf,
    port: u16,
}

impl NfsVfsServer {
    pub fn new(vfs: Arc<dyn VfsBackend>, root: PathBuf) -> Self {
        Self {
            vfs,
            root,
            port: 2049,
        }
    }
    
    pub fn with_port(self, port: u16) -> Self {
        Self { port, ..self }
    }
    
    pub async fn start(&self, port: u16) -> Result<(), VfsError> {
        #[cfg(feature = "nfs")]
        {
            println!("NFS server starting on port {}", port);
            println!("Export directory: {}", self.root.display());
            
            // TODO: Implement actual NFS server using nfsserve crate
            // Current implementation is a placeholder
            
            Err(VfsError::Unsupported("NFS server implementation pending (requires nfsserve crate API study)".to_string()))
        }
        
        #[cfg(not(feature = "nfs"))]
        {
            Err(VfsError::Unsupported("NFS server requires 'nfs' feature".to_string()))
        }
    }
}

pub struct NfsConfig {
    pub port: u16,
    pub root: PathBuf,
    pub vfs: Arc<dyn VfsBackend>,
}

impl Default for NfsConfig {
    fn default() -> Self {
        Self {
            port: 2049,
            root: PathBuf::from("/"),
            vfs: Arc::new(crate::vfs::local_fs::LocalFs::new()),
        }
    }
}

impl NfsConfig {
    pub fn build(&self) -> NfsVfsServer {
        NfsVfsServer::new(self.vfs.clone(), self.root.clone()).with_port(self.port)
    }
}