mcp-tools 0.1.0

//! Base client implementation for MCP Tools

use super::*;
use crate::{McpToolsError, Result};
use std::sync::Arc;
use tokio::sync::RwLock;
use tracing::{debug, error, info};

/// Base MCP client trait
#[async_trait::async_trait]
pub trait McpClientBase: Send + Sync {
    /// Connect to MCP server
    async fn connect(&mut self) -> Result<()>;

    /// Disconnect from MCP server
    async fn disconnect(&mut self) -> Result<()>;

    /// Get server capabilities
    async fn get_server_capabilities(&self) -> Result<ServerCapabilities>;

    /// Execute tool on server
    async fn execute_tool(&self, request: McpToolRequest) -> Result<McpToolResponse>;

    /// Get connection status
    async fn get_status(&self) -> Result<ConnectionStatus>;
}

/// Base client implementation
pub struct BaseClient {
    /// Client configuration
    config: ClientConfig,
    /// Connection status
    status: Arc<RwLock<ConnectionStatus>>,
    /// Server capabilities cache
    capabilities: Arc<RwLock<Option<ServerCapabilities>>>,
}

impl BaseClient {
    /// Create new base client
    pub fn new(config: ClientConfig) -> Self {
        Self {
            config,
            status: Arc::new(RwLock::new(ConnectionStatus::Disconnected)),
            capabilities: Arc::new(RwLock::new(None)),
        }
    }

    /// Get client configuration
    pub fn config(&self) -> &ClientConfig {
        &self.config
    }

    /// Set connection status
    async fn set_status(&self, status: ConnectionStatus) {
        let mut current_status = self.status.write().await;
        *current_status = status;
    }

    /// Cache server capabilities
    async fn cache_capabilities(&self, capabilities: ServerCapabilities) {
        let mut cached = self.capabilities.write().await;
        *cached = Some(capabilities);
    }
}

#[async_trait::async_trait]
impl McpClientBase for BaseClient {
    async fn connect(&mut self) -> Result<()> {
        info!("Connecting to MCP server: {}", self.config.server_url);

        self.set_status(ConnectionStatus::Connecting).await;

        // TODO: Implement actual connection logic
        // For now, simulate connection
        tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;

        self.set_status(ConnectionStatus::Connected).await;
        info!("Connected to MCP server successfully");

        Ok(())
    }

    async fn disconnect(&mut self) -> Result<()> {
        info!("Disconnecting from MCP server");

        // TODO: Implement actual disconnection logic

        self.set_status(ConnectionStatus::Disconnected).await;

        // Clear cached capabilities
        let mut cached = self.capabilities.write().await;
        *cached = None;

        info!("Disconnected from MCP server");
        Ok(())
    }

    async fn get_server_capabilities(&self) -> Result<ServerCapabilities> {
        // Check if we have cached capabilities
        {
            let cached = self.capabilities.read().await;
            if let Some(capabilities) = cached.as_ref() {
                return Ok(capabilities.clone());
            }
        }

        // TODO: Implement actual capability request
        // For now, return mock capabilities
        let capabilities = ServerCapabilities {
            tools: vec![],
            features: vec!["mock".to_string()],
            info: ServerInfo {
                name: "Mock Server".to_string(),
                version: "1.0.0".to_string(),
                description: "Mock MCP Server".to_string(),
                coderlib_version: "0.1.0".to_string(), // TODO: Get from coderlib when available
                protocol_version: "1.0".to_string(),
            },
        };

        self.cache_capabilities(capabilities.clone()).await;
        Ok(capabilities)
    }

    async fn execute_tool(&self, request: McpToolRequest) -> Result<McpToolResponse> {
        debug!("Executing tool: {}", request.tool);

        // Check connection status
        let status = self.status.read().await;
        if *status != ConnectionStatus::Connected {
            return Err(McpToolsError::Client("Not connected to server".to_string()));
        }

        // TODO: Implement actual tool execution
        // For now, return mock response
        Ok(McpToolResponse::error(
            request.id,
            "Tool execution not implemented in base client",
        ))
    }

    async fn get_status(&self) -> Result<ConnectionStatus> {
        let status = self.status.read().await;
        Ok(status.clone())
    }
}

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

    #[tokio::test]
    async fn test_base_client_creation() {
        let config = ClientConfig::default();
        let client = BaseClient::new(config);

        let status = client.get_status().await.unwrap();
        assert_eq!(status, ConnectionStatus::Disconnected);
    }

    #[tokio::test]
    async fn test_client_connection() {
        let config = ClientConfig::default();
        let mut client = BaseClient::new(config);

        client.connect().await.unwrap();

        let status = client.get_status().await.unwrap();
        assert_eq!(status, ConnectionStatus::Connected);

        client.disconnect().await.unwrap();

        let status = client.get_status().await.unwrap();
        assert_eq!(status, ConnectionStatus::Disconnected);
    }
}