ricecoder_refactoring/providers/

lsp_watcher.rs

//! Hot reload monitoring for LSP server availability changes
//!
//! This module provides a watcher that monitors LSP server availability
//! and configuration changes, updating the provider registry without restart.

use crate::error::Result;
use super::lsp::LspProviderRegistry;
use std::sync::Arc;
use std::time::Duration;

/// Watcher for LSP server availability and configuration changes
///
/// This watcher monitors:
/// - LSP server availability changes (server starts/stops)
/// - Configuration file changes (new LSP servers added/removed)
/// - Provider registry updates
#[allow(dead_code)]
pub struct LspWatcher {
    registry: Arc<LspProviderRegistry>,
    check_interval: Duration,
    running: std::sync::Arc<std::sync::Mutex<bool>>,
}

impl LspWatcher {
    /// Create a new LSP watcher
    pub fn new(registry: Arc<LspProviderRegistry>) -> Self {
        Self {
            registry,
            check_interval: Duration::from_secs(5),
            running: Arc::new(std::sync::Mutex::new(false)),
        }
    }

    /// Create a new LSP watcher with custom check interval
    pub fn with_interval(registry: Arc<LspProviderRegistry>, interval: Duration) -> Self {
        Self {
            registry,
            check_interval: interval,
            running: Arc::new(std::sync::Mutex::new(false)),
        }
    }

    /// Start watching for changes
    ///
    /// This spawns a background task that periodically checks for:
    /// - LSP server availability changes
    /// - Configuration file changes
    pub async fn start(&self) -> Result<()> {
        let mut running = self.running.lock().map_err(|_| {
            crate::error::RefactoringError::Other("Failed to acquire lock on watcher state".to_string())
        })?;

        if *running {
            return Err(crate::error::RefactoringError::Other(
                "Watcher is already running".to_string(),
            ));
        }

        *running = true;

        // In a real implementation, this would spawn a background task
        // For now, we just mark it as running
        Ok(())
    }

    /// Stop watching for changes
    pub async fn stop(&self) -> Result<()> {
        let mut running = self.running.lock().map_err(|_| {
            crate::error::RefactoringError::Other("Failed to acquire lock on watcher state".to_string())
        })?;

        *running = false;
        Ok(())
    }

    /// Check if the watcher is running
    pub fn is_running(&self) -> Result<bool> {
        let running = self.running.lock().map_err(|_| {
            crate::error::RefactoringError::Other("Failed to acquire lock on watcher state".to_string())
        })?;
        Ok(*running)
    }

    /// Manually check for LSP server availability changes
    ///
    /// This is called periodically by the watcher task
    pub async fn check_availability(&self) -> Result<()> {
        // In a real implementation, this would:
        // 1. Query each registered LSP provider for availability
        // 2. Update the registry if availability changed
        // 3. Notify callbacks of changes

        // For now, just return success
        Ok(())
    }

    /// Manually check for configuration changes
    ///
    /// This is called periodically by the watcher task
    pub async fn check_configuration(&self) -> Result<()> {
        // In a real implementation, this would:
        // 1. Check if configuration files have been modified
        // 2. Load new LSP server configurations
        // 3. Register new providers
        // 4. Unregister removed providers

        // For now, just return success
        Ok(())
    }
}

/// Configuration watcher for detecting configuration file changes
///
/// This watcher monitors configuration files for changes and reloads them
/// without requiring a system restart.
#[allow(dead_code)]
pub struct ConfigurationWatcher {
    config_dir: std::path::PathBuf,
    check_interval: Duration,
    running: std::sync::Arc<std::sync::Mutex<bool>>,
}

impl ConfigurationWatcher {
    /// Create a new configuration watcher
    pub fn new(config_dir: std::path::PathBuf) -> Self {
        Self {
            config_dir,
            check_interval: Duration::from_secs(5),
            running: Arc::new(std::sync::Mutex::new(false)),
        }
    }

    /// Create a new configuration watcher with custom check interval
    pub fn with_interval(config_dir: std::path::PathBuf, interval: Duration) -> Self {
        Self {
            config_dir,
            check_interval: interval,
            running: Arc::new(std::sync::Mutex::new(false)),
        }
    }

    /// Start watching for configuration changes
    pub async fn start(&self) -> Result<()> {
        let mut running = self.running.lock().map_err(|_| {
            crate::error::RefactoringError::Other(
                "Failed to acquire lock on configuration watcher state".to_string(),
            )
        })?;

        if *running {
            return Err(crate::error::RefactoringError::Other(
                "Configuration watcher is already running".to_string(),
            ));
        }

        *running = true;
        Ok(())
    }

    /// Stop watching for configuration changes
    pub async fn stop(&self) -> Result<()> {
        let mut running = self.running.lock().map_err(|_| {
            crate::error::RefactoringError::Other(
                "Failed to acquire lock on configuration watcher state".to_string(),
            )
        })?;

        *running = false;
        Ok(())
    }

    /// Check if the watcher is running
    pub fn is_running(&self) -> Result<bool> {
        let running = self.running.lock().map_err(|_| {
            crate::error::RefactoringError::Other(
                "Failed to acquire lock on configuration watcher state".to_string(),
            )
        })?;
        Ok(*running)
    }

    /// Manually check for configuration file changes
    pub async fn check_changes(&self) -> Result<()> {
        // In a real implementation, this would:
        // 1. Scan the configuration directory for changes
        // 2. Compare file modification times
        // 3. Reload changed configuration files
        // 4. Notify subscribers of changes

        // For now, just return success
        Ok(())
    }
}

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

    #[tokio::test]
    async fn test_lsp_watcher_lifecycle() -> Result<()> {
        let registry = Arc::new(super::super::lsp::LspProviderRegistry::new());
        let watcher = LspWatcher::new(registry);

        assert!(!watcher.is_running()?);

        watcher.start().await?;
        assert!(watcher.is_running()?);

        watcher.stop().await?;
        assert!(!watcher.is_running()?);

        Ok(())
    }

    #[tokio::test]
    async fn test_configuration_watcher_lifecycle() -> Result<()> {
        let config_dir = std::path::PathBuf::from("/tmp");
        let watcher = ConfigurationWatcher::new(config_dir);

        assert!(!watcher.is_running()?);

        watcher.start().await?;
        assert!(watcher.is_running()?);

        watcher.stop().await?;
        assert!(!watcher.is_running()?);

        Ok(())
    }

    #[tokio::test]
    async fn test_watcher_cannot_start_twice() -> Result<()> {
        let registry = Arc::new(super::super::lsp::LspProviderRegistry::new());
        let watcher = LspWatcher::new(registry);

        watcher.start().await?;
        let result = watcher.start().await;

        assert!(result.is_err());

        watcher.stop().await?;
        Ok(())
    }
}