import Foundation
import Network

/// Manages MCP connection and transport selection
class MCPConnectionManager: ObservableObject {
    static let shared = MCPConnectionManager()

    @Published var isConnected = false
    @Published var transportType: TransportType = .http

    enum TransportType {
        case http
        case stdio
        case unixSocket
        case environmentVariables
    }

    private var connection: NWConnection?

    private init() {}

    /// Initialize MCP connection with transport priority
    func initialize() {
        // Transport selection priority:
        // 1. HTTP dev server (if available)
        // 2. Environment variables
        // 3. stdio
        // 4. Unix socket fallback

        if tryHTTPConnection() {
            transportType = .http
        } else if tryEnvironmentVariables() {
            transportType = .environmentVariables
        } else if tryUnixSocket() {
            transportType = .unixSocket
        } else {
            transportType = .stdio
        }

        isConnected = true
    }

    /// Disconnect from MCP server
    func disconnect() {
        connection?.cancel()
        connection = nil
        isConnected = false
    }

    // MARK: - Transport Methods

    private func tryHTTPConnection() -> Bool {
        // Try to connect to HTTP dev server
        // TODO: Implement HTTP connection
        return false
    }

    private func tryEnvironmentVariables() -> Bool {
        // Check for MCP environment variables
        return ProcessInfo.processInfo.environment["MCP_ENDPOINT"] != nil
    }

    private func tryUnixSocket() -> Bool {
        // Try to connect via Unix socket
        // TODO: Implement Unix socket connection
        return false
    }
}
