ssh-commander-core 0.1.0

use anyhow::Result;
use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use tokio::sync::mpsc;
use tokio_util::sync::CancellationToken;

/// A decoded framebuffer update — a dirty rectangle with RGBA pixel data.
///
/// Emitted by the `DesktopProtocol::start_frame_loop` trait method. The RDP
/// and VNC clients are currently stubs; once they produce real frames,
/// `ConnectionManager::start_desktop_stream` will plumb these to the
/// WebSocket server. Until then the struct and its field are "dead" only
/// in the sense that no production code exercises them yet.
#[allow(dead_code)]
#[derive(Clone, Debug)]
pub struct FrameUpdate {
    pub x: u16,
    pub y: u16,
    pub width: u16,
    pub height: u16,
    /// Raw RGBA pixel data (width × height × 4 bytes)
    pub rgba_data: Vec<u8>,
}

/// Unified trait for RDP and VNC remote desktop protocol clients.
///
/// Both `RdpClient` and `VncClient` implement this trait so that the
/// `ConnectionManager` and Tauri commands can work protocol-agnostically.
#[async_trait]
pub trait DesktopProtocol: Send + Sync {
    /// Start the frame update loop, sending `FrameUpdate` messages via the
    /// provided sender until the cancellation token is triggered.
    async fn start_frame_loop(
        &self,
        frame_tx: mpsc::UnboundedSender<FrameUpdate>,
        cancel: CancellationToken,
    ) -> Result<()>;

    /// Send a keyboard event to the remote host.
    async fn send_key(&self, key_code: u32, down: bool) -> Result<()>;

    /// Send a pointer (mouse) event to the remote host.
    async fn send_pointer(&self, x: u16, y: u16, button_mask: u8) -> Result<()>;

    /// Request a full framebuffer update from the remote host.
    async fn request_full_frame(&self) -> Result<()>;

    /// Send clipboard text to the remote session.
    async fn set_clipboard(&self, text: String) -> Result<()>;

    /// Get the remote desktop dimensions (width, height).
    fn desktop_size(&self) -> (u16, u16);

    /// Request the remote desktop to resize to the given dimensions.
    /// For RDP: sends a display resize request to the server.
    /// For VNC: no-op (VNC does not support server-side resize; client-side scaling is used).
    async fn resize(&mut self, width: u16, height: u16) -> Result<()>;

    /// Disconnect and release resources.
    async fn disconnect(&mut self) -> Result<()>;
}

// ---------------------------------------------------------------------------
// Request / response data models shared between Tauri commands and WebSocket
// ---------------------------------------------------------------------------

/// Which remote-desktop protocol the client is asking for.
///
/// Serialised as `"RDP"` / `"VNC"`, while also accepting lowercase aliases for
/// compatibility with older frontend payloads.
#[derive(Debug, Clone, Copy, Deserialize, PartialEq, Eq)]
pub enum DesktopKind {
    #[serde(rename = "RDP", alias = "rdp")]
    Rdp,
    #[serde(rename = "VNC", alias = "vnc")]
    Vnc,
}

/// Request to establish an RDP or VNC connection.
#[derive(Deserialize)]
pub struct DesktopConnectRequest {
    pub connection_id: String,
    pub protocol: DesktopKind,
    pub host: String,
    pub port: u16,
    pub username: Option<String>, // RDP only
    pub password: Option<String>,
    pub domain: Option<String>, // RDP only
    /// RDP resolution: "1024x768", "1280x720", "1920x1080", or "fit"
    pub resolution: Option<String>,
    /// VNC color depth: 24, 16, or 8
    pub color_depth: Option<u8>,
}

impl std::fmt::Debug for DesktopConnectRequest {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("DesktopConnectRequest")
            .field("connection_id", &self.connection_id)
            .field("protocol", &format_args!("{:?}", self.protocol))
            .field("host", &self.host)
            .field("port", &self.port)
            .field("username", &self.username)
            .field(
                "password",
                &self
                    .password
                    .as_ref()
                    .map(|_| "<redacted>")
                    .unwrap_or("<none>"),
            )
            .field("domain", &self.domain)
            .field("resolution", &self.resolution)
            .field("color_depth", &self.color_depth)
            .finish()
    }
}

/// Response after a successful desktop connection.
#[derive(Debug, Serialize)]
pub struct DesktopConnectResponse {
    pub width: u16,
    pub height: u16,
}

// ---------------------------------------------------------------------------
// Protocol-specific config structs (used internally by the clients)
// ---------------------------------------------------------------------------

#[derive(Clone)]
pub struct RdpConfig {
    pub host: String,
    pub port: u16,
    pub username: String,
    /// Credential slot — consumed by the NLA handshake once `RdpClient::connect`
    /// gets a real implementation (see rdp_client.rs).
    #[allow(dead_code)]
    pub password: String,
    pub domain: Option<String>,
    pub width: u16,
    pub height: u16,
}

impl std::fmt::Debug for RdpConfig {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("RdpConfig")
            .field("host", &self.host)
            .field("port", &self.port)
            .field("username", &self.username)
            .field("password", &"<redacted>")
            .field("domain", &self.domain)
            .field("width", &self.width)
            .field("height", &self.height)
            .finish()
    }
}

#[derive(Clone)]
pub struct VncConfig {
    pub host: String,
    pub port: u16,
    pub password: Option<String>,
    pub color_depth: u8, // 24, 16, or 8
}

impl std::fmt::Debug for VncConfig {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("VncConfig")
            .field("host", &self.host)
            .field("port", &self.port)
            .field(
                "password",
                &self
                    .password
                    .as_ref()
                    .map(|_| "<redacted>")
                    .unwrap_or("<none>"),
            )
            .field("color_depth", &self.color_depth)
            .finish()
    }
}

impl DesktopConnectRequest {
    /// Parse the resolution string into (width, height), defaulting to 1024×768.
    pub fn parse_resolution(&self) -> (u16, u16) {
        match self.resolution.as_deref() {
            Some("1920x1080") => (1920, 1080),
            Some("1280x720") => (1280, 720),
            Some("1024x768") => (1024, 768),
            _ => (1024, 768), // "fit" or unknown → default
        }
    }

    /// Convert to an `RdpConfig`.
    pub fn to_rdp_config(&self) -> RdpConfig {
        let (w, h) = self.parse_resolution();
        RdpConfig {
            host: self.host.clone(),
            port: self.port,
            username: self.username.clone().unwrap_or_default(),
            password: self.password.clone().unwrap_or_default(),
            domain: self.domain.clone(),
            width: w,
            height: h,
        }
    }

    /// Convert to a `VncConfig`.
    pub fn to_vnc_config(&self) -> VncConfig {
        VncConfig {
            host: self.host.clone(),
            port: self.port,
            password: self.password.clone(),
            color_depth: self.color_depth.unwrap_or(24),
        }
    }
}

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

    #[test]
    fn desktop_kind_accepts_uppercase_and_lowercase_wire_values() {
        assert_eq!(
            serde_json::from_str::<DesktopKind>("\"RDP\"").unwrap(),
            DesktopKind::Rdp
        );
        assert_eq!(
            serde_json::from_str::<DesktopKind>("\"rdp\"").unwrap(),
            DesktopKind::Rdp
        );
        assert_eq!(
            serde_json::from_str::<DesktopKind>("\"VNC\"").unwrap(),
            DesktopKind::Vnc
        );
        assert_eq!(
            serde_json::from_str::<DesktopKind>("\"vnc\"").unwrap(),
            DesktopKind::Vnc
        );
    }
}