//! MCP (Model Context Protocol) infrastructure for Wraith.
//!
//! Provides programmatic access to active sessions so AI tools running in the
//! copilot panel can read terminal output, execute commands, and enumerate
//! sessions.

pub mod scrollback;
pub mod server;
pub mod error_watcher;

use std::sync::Arc;

use dashmap::DashMap;

use crate::mcp::scrollback::ScrollbackBuffer;

/// Registry of scrollback buffers keyed by session ID.
/// Shared between SSH/PTY output loops (writers) and MCP tools (readers).
#[derive(Clone)]
pub struct ScrollbackRegistry {
    buffers: DashMap<String, Arc<ScrollbackBuffer>>,
}

impl ScrollbackRegistry {
    pub fn new() -> Self {
        Self { buffers: DashMap::new() }
    }

    /// Create and register a new scrollback buffer for a session.
    pub fn create(&self, session_id: &str) -> Arc<ScrollbackBuffer> {
        let buf = Arc::new(ScrollbackBuffer::new());
        self.buffers.insert(session_id.to_string(), buf.clone());
        buf
    }

    /// Get the scrollback buffer for a session.
    pub fn get(&self, session_id: &str) -> Option<Arc<ScrollbackBuffer>> {
        self.buffers.get(session_id).map(|entry| entry.clone())
    }

    /// Remove a session's scrollback buffer.
    pub fn remove(&self, session_id: &str) {
        self.buffers.remove(session_id);
    }
}