netget-tool 0.3.4

//! Client instance management

use crate::utils::clock::Instant;
use std::collections::HashMap;
use std::net::SocketAddr;
use std::path::PathBuf;

/// Unique identifier for a client instance
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, serde::Serialize, serde::Deserialize)]
pub struct ClientId(u32);

impl ClientId {
    /// Create a new client ID from a u32
    pub fn new(id: u32) -> Self {
        Self(id)
    }

    /// Get the raw ID value
    pub fn as_u32(&self) -> u32 {
        self.0
    }

    /// Parse from string (expects format "client-123" or just "123")
    pub fn from_string(s: &str) -> Option<Self> {
        let s = s.trim();
        let id_str = s.strip_prefix("client-").unwrap_or(s);
        id_str.parse::<u32>().ok().map(Self)
    }
}

impl std::fmt::Display for ClientId {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "client-{}", self.0)
    }
}

/// Status of a client connection
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ClientStatus {
    /// Client is connecting
    Connecting,
    /// Client is connected and active
    Connected,
    /// Client connection has been closed
    Disconnected,
    /// Client encountered an error
    Error(String),
}

impl ClientStatus {
    pub fn as_str(&self) -> &str {
        match self {
            Self::Connecting => "Connecting",
            Self::Connected => "Connected",
            Self::Disconnected => "Disconnected",
            Self::Error(_) => "Error",
        }
    }
}

impl std::fmt::Display for ClientStatus {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Connecting => write!(f, "Connecting"),
            Self::Connected => write!(f, "Connected"),
            Self::Disconnected => write!(f, "Disconnected"),
            Self::Error(msg) => write!(f, "Error: {}", msg),
        }
    }
}

/// Client connection state
#[derive(Debug, Clone)]
pub struct ClientConnectionState {
    /// Client ID
    pub id: ClientId,
    /// Remote server address (hostname:port or IP:port)
    pub remote_addr: String,
    /// Actual connected socket address (after DNS resolution)
    pub connected_addr: Option<SocketAddr>,
    /// Local address (our side of the connection)
    pub local_addr: Option<SocketAddr>,
    /// Bytes sent
    pub bytes_sent: u64,
    /// Bytes received
    pub bytes_received: u64,
    /// Packets sent
    pub packets_sent: u64,
    /// Packets received
    pub packets_received: u64,
    /// Last activity timestamp
    pub last_activity: Instant,
    /// Connection status (Connecting/Connected/Disconnected)
    pub status: ClientStatus,
    /// When status last changed
    pub status_changed_at: Instant,
    /// Protocol-specific information (flexible JSON storage)
    pub protocol_info: super::server::ProtocolConnectionInfo,
}

/// How many connection attempts a client remembers for the "recent
/// connections" view.
pub const CLIENT_CONNECTION_HISTORY_CAPACITY: usize = 20;

/// One connection attempt in a client's lifetime, recorded on status
/// transitions (see `AppState::update_client_status`). Wall-clock timestamps
/// so the struct is serializable and stable across a UI session.
#[derive(Debug, Clone, serde::Serialize)]
pub struct ClientConnectionAttempt {
    pub remote_addr: String,
    pub started_unix_ms: u64,
    /// None while the attempt is still live (Connecting/Connected).
    pub ended_unix_ms: Option<u64>,
    /// "connecting" | "connected" | "disconnected" | "error: …"
    pub outcome: String,
}

fn now_unix_ms() -> u64 {
    crate::utils::clock::SystemTime::now()
        .duration_since(crate::utils::clock::UNIX_EPOCH)
        .map(|d| d.as_millis() as u64)
        .unwrap_or(0)
}

/// A client instance with its own connection, state, and configuration
///
/// `Clone` is derived; see [`crate::state::server::ServerInstance`] for why the hand-written
/// copies it replaces existed.
#[derive(Debug, Clone)]
pub struct ClientInstance {
    /// Unique client ID
    pub id: ClientId,
    /// Remote server address (hostname:port or IP:port)
    pub remote_addr: String,
    /// Protocol name (e.g., "HTTP", "SSH", "Redis")
    pub protocol_name: String,
    /// User instructions for this client
    pub instruction: String,
    /// LLM memory for this client
    pub memory: String,
    /// Client connection status
    pub status: ClientStatus,
    /// Connection state (if connected)
    pub connection: Option<ClientConnectionState>,
    /// When the client was created
    pub created_at: Instant,
    /// When the client status last changed
    pub status_changed_at: Instant,
    /// Protocol-specific startup parameters
    pub startup_params: Option<serde_json::Value>,
    /// Event handler configuration for handling protocol events
    pub event_handler_config: Option<crate::scripting::EventHandlerConfig>,
    /// Protocol-specific client data (flexible storage)
    ///
    /// This replaces protocol-specific feature-gated fields.
    /// Each protocol can store any data structure here by serializing to JSON.
    /// Use get_protocol_data() and set_protocol_data() helper methods.
    pub protocol_data: serde_json::Value,
    /// Log file paths (output_name -> log_file_path)
    pub log_files: HashMap<String, PathBuf>,
    /// Feedback instructions for automatic client adjustment
    /// When set, server responses can provide feedback that triggers LLM-based client adjustments
    pub feedback_instructions: Option<String>,
    /// Accumulated feedback buffer (cleared after processing)
    /// Each entry is a JSON value containing feedback data
    pub feedback_buffer: Vec<serde_json::Value>,
    /// Last time feedback was processed (for debouncing)
    pub last_feedback_processed: Option<Instant>,
    /// Connection attempts, newest last, capped at
    /// [`CLIENT_CONNECTION_HISTORY_CAPACITY`]. Maintained by
    /// `AppState::update_client_status` via [`Self::record_status_transition`].
    pub connection_history: std::collections::VecDeque<ClientConnectionAttempt>,
}

impl ClientInstance {
    /// Create a new client instance
    pub fn new(
        id: ClientId,
        remote_addr: String,
        protocol_name: String,
        instruction: String,
    ) -> Self {
        let now = Instant::now();
        Self {
            id,
            remote_addr,
            protocol_name,
            instruction,
            memory: String::new(),
            status: ClientStatus::Connecting,
            connection: None,
            created_at: now,
            status_changed_at: now,
            startup_params: None,
            event_handler_config: None,
            protocol_data: serde_json::Value::Object(serde_json::Map::new()),
            log_files: HashMap::new(),
            feedback_instructions: None,
            feedback_buffer: Vec::new(),
            last_feedback_processed: None,
            connection_history: std::collections::VecDeque::new(),
        }
    }

    /// Fold a status transition into [`Self::connection_history`]: a
    /// `Connecting` opens a new attempt, `Connected` updates the live one, and
    /// `Disconnected`/`Error` close it with an outcome.
    pub fn record_status_transition(&mut self, status: &ClientStatus) {
        let live_tail = self
            .connection_history
            .back_mut()
            .filter(|attempt| attempt.ended_unix_ms.is_none());
        match status {
            ClientStatus::Connecting => {
                // A reconnect while a previous attempt is still open closes it
                // first so history never holds two live attempts.
                if let Some(attempt) = live_tail {
                    attempt.ended_unix_ms = Some(now_unix_ms());
                }
                self.connection_history.push_back(ClientConnectionAttempt {
                    remote_addr: self.remote_addr.clone(),
                    started_unix_ms: now_unix_ms(),
                    ended_unix_ms: None,
                    outcome: "connecting".to_string(),
                });
                let excess = self
                    .connection_history
                    .len()
                    .saturating_sub(CLIENT_CONNECTION_HISTORY_CAPACITY);
                for _ in 0..excess {
                    self.connection_history.pop_front();
                }
            }
            ClientStatus::Connected => {
                if let Some(attempt) = live_tail {
                    attempt.outcome = "connected".to_string();
                } else {
                    // Connected without a recorded Connecting (direct literal
                    // construction starts at Connecting but never transitioned
                    // through update_client_status): open-and-mark in one step.
                    self.connection_history.push_back(ClientConnectionAttempt {
                        remote_addr: self.remote_addr.clone(),
                        started_unix_ms: now_unix_ms(),
                        ended_unix_ms: None,
                        outcome: "connected".to_string(),
                    });
                }
            }
            ClientStatus::Disconnected => {
                if let Some(attempt) = live_tail {
                    attempt.ended_unix_ms = Some(now_unix_ms());
                    attempt.outcome = "disconnected".to_string();
                }
            }
            ClientStatus::Error(message) => {
                if let Some(attempt) = live_tail {
                    attempt.ended_unix_ms = Some(now_unix_ms());
                    attempt.outcome = format!("error: {message}");
                }
            }
        }
    }

    /// Get protocol-specific data
    pub fn get_protocol_data<T: serde::de::DeserializeOwned>(
        &self,
    ) -> Result<T, serde_json::Error> {
        serde_json::from_value(self.protocol_data.clone())
    }

    /// Set protocol-specific data
    pub fn set_protocol_data<T: serde::Serialize>(
        &mut self,
        data: T,
    ) -> Result<(), serde_json::Error> {
        self.protocol_data = serde_json::to_value(data)?;
        Ok(())
    }

    /// Get a field from protocol data
    pub fn get_protocol_field(&self, key: &str) -> Option<&serde_json::Value> {
        self.protocol_data.get(key)
    }

    /// Set a field in protocol data
    pub fn set_protocol_field(&mut self, key: String, value: serde_json::Value) {
        if let Some(obj) = self.protocol_data.as_object_mut() {
            obj.insert(key, value);
        } else {
            // Initialize as object if not already
            let mut map = serde_json::Map::new();
            map.insert(key, value);
            self.protocol_data = serde_json::Value::Object(map);
        }
    }

    /// Get or create a log file path for the given output name
    /// Returns the path to the log file with format: netget_<output_name>_<timestamp>.log
    /// The timestamp is based on when the client was created
    ///
    /// `output_name` is model-authored and becomes part of a filename; see
    /// `server::validate_log_output_name`.
    pub fn get_or_create_log_path(&mut self, output_name: &str) -> anyhow::Result<PathBuf> {
        crate::state::server::validate_log_output_name(output_name)?;
        if let Some(path) = self.log_files.get(output_name) {
            return Ok(path.clone());
        }

        // Calculate the absolute time when the client was created
        // by subtracting the elapsed time from now
        let now = crate::utils::clock::SystemTime::now();
        let elapsed = self.created_at.elapsed();
        let created_system_time = now - elapsed;

        // Convert to DateTime for formatting
        let timestamp = crate::utils::clock::to_local_datetime(created_system_time);
        let timestamp_str = timestamp.format("%Y_%m_%d_%H_%M_%S").to_string();

        let log_filename = format!("netget_{}_{}.log", output_name, timestamp_str);
        let log_path = PathBuf::from(log_filename);

        self.log_files
            .insert(output_name.to_string(), log_path.clone());
        Ok(log_path)
    }

    /// Get a summary for display
    pub fn summary(&self) -> String {
        let duration = self.created_at.elapsed();
        let duration_str = if duration.as_secs() < 60 {
            format!("{}s", duration.as_secs())
        } else if duration.as_secs() < 3600 {
            format!("{}m", duration.as_secs() / 60)
        } else {
            format!("{}h", duration.as_secs() / 3600)
        };

        format!(
            "#{} {} → {} ({}) - {}",
            self.id.as_u32(),
            self.protocol_name,
            self.remote_addr,
            self.status.as_str(),
            duration_str
        )
    }
}