use clap::Subcommand;

#[derive(Subcommand)]
pub enum SmbServerCommand {
    #[command(name = "smb-start")]
    Start {
        #[arg(short, long, default_value = "4445")]
        port: u16,

        #[arg(short, long, default_value = "/Users/accusys/momentry/var/sftpgo/data/demo")]
        root: String,

        #[arg(short, long, default_value = "markbase")]
        share_name: String,

        #[arg(long)]
        read_only: bool,

        #[arg(short, long, value_parser = parse_user)]
        user: Vec<(String, String)>,

        #[arg(long)]
        s3: bool,

        #[arg(long)]
        s3_endpoint: Option<String>,

        #[arg(long)]
        s3_bucket: Option<String>,

        #[arg(long)]
        s3_access_key: Option<String>,

        #[arg(long)]
        s3_secret_key: Option<String>,

        #[arg(long, default_value = "us-east-1")]
        s3_region: String,
    },
}

fn parse_user(s: &str) -> Result<(String, String), String> {
    let parts: Vec<&str> = s.split(':').collect();
    if parts.len() != 2 {
        return Err(format!("Invalid user format '{}'. Expected 'name:password'", s));
    }
    Ok((parts[0].to_string(), parts[1].to_string()))
}

pub async fn handle_smb_server_command(cmd: SmbServerCommand) -> anyhow::Result<()> {
    #[cfg(feature = "smb-server")]
    {
        match cmd {
            SmbServerCommand::Start {
                port,
                root,
                share_name,
                read_only,
                user,
                s3,
                s3_endpoint,
                s3_bucket,
                s3_access_key,
                s3_secret_key,
                s3_region,
            } => {
                use std::path::PathBuf;

                use smb_server::{Access, Share, SmbServer};
                use tracing_subscriber::EnvFilter;

                let _ = tracing_subscriber::fmt()
                    .with_env_filter(
                        EnvFilter::try_from_default_env()
                            .unwrap_or_else(|_| EnvFilter::new("info")),
                    )
                    .try_init();

                let addr: std::net::SocketAddr = format!("0.0.0.0:{}", port).parse()?;
                let root_path = PathBuf::from(&root);

                let vfs: Box<dyn crate::vfs::VfsBackend> = if s3 {
                    let endpoint = s3_endpoint
                        .ok_or_else(|| anyhow::anyhow!("--s3-endpoint required when --s3 is enabled"))?;
                    let bucket = s3_bucket
                        .ok_or_else(|| anyhow::anyhow!("--s3-bucket required when --s3 is enabled"))?;
                    let access_key = s3_access_key
                        .ok_or_else(|| anyhow::anyhow!("--s3-access-key required when --s3 is enabled"))?;
                    let secret_key = s3_secret_key
                        .ok_or_else(|| anyhow::anyhow!("--s3-secret-key required when --s3 is enabled"))?;

                    log::info!("S3 backend: endpoint={}, bucket={}, region={}", endpoint, bucket, s3_region);

                    Box::new(crate::vfs::s3_fs::S3Vfs::new(
                        &endpoint,
                        &s3_region,
                        &bucket,
                        &access_key,
                        &secret_key,
                    )?)
                } else {
                    Box::new(crate::vfs::local_fs::LocalFs::new())
                };

                let backend = crate::vfs::smb_server_backend::VfsShareBackend::new(vfs, root_path)
                    .read_only(read_only);

                let users: Vec<(String, String)> = if user.is_empty() {
                    vec![("demo".to_string(), "demo123".to_string())]
                } else {
                    user
                };

                let mut builder = SmbServer::builder().listen(addr);

                for (name, password) in &users {
                    builder = builder.user(name, password);
                }

                let mut share = Share::new(&share_name, backend);
                for (name, _) in &users {
                    share = share.user(name, Access::ReadWrite);
                }

                let server = builder.share(share).build()?;

                let user_list: Vec<&str> = users.iter().map(|(n, _)| n.as_str()).collect();
                log::info!("SMB server listening on {}", addr);
                log::info!("Share '{}' at root: {}", share_name, root);
                log::info!("Users: {}", user_list.join(", "));

                server.serve().await?;
            }
        }
    }

    #[cfg(not(feature = "smb-server"))]
    {
        let _ = cmd;
        anyhow::bail!("SMB server support not enabled. Build with --features smb-server");
    }

    Ok(())
}