/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { SSEClientTransport } from '@modelcontextprotocol/sdk/client/sse.js';
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js';
import { GetPromptResultSchema, ListPromptsResultSchema, ListRootsRequestSchema, } from '@modelcontextprotocol/sdk/types.js';
import { parse } from 'shell-quote';
import { AuthProviderType } from '../config/config.js';
import { GoogleCredentialProvider } from '../mcp/google-auth-provider.js';
import { ServiceAccountImpersonationProvider } from '../mcp/sa-impersonation-provider.js';
import { DiscoveredMCPTool } from './mcp-tool.js';
import { mcpToTool } from '@google/genai';
import { basename } from 'node:path';
import { pathToFileURL } from 'node:url';
import { MCPOAuthProvider } from '../mcp/oauth-provider.js';
import { MCPOAuthTokenStorage } from '../mcp/oauth-token-storage.js';
import { OAuthUtils } from '../mcp/oauth-utils.js';
import { getErrorMessage } from '../utils/errors.js';
import { debugLogger } from '../utils/debugLogger.js';
import { coreEvents } from '../utils/events.js';
export const MCP_DEFAULT_TIMEOUT_MSEC = 10 * 60 * 1000; // default to 10 minutes
/**
 * Enum representing the connection status of an MCP server
 */
export var MCPServerStatus;
(function (MCPServerStatus) {
    /** Server is disconnected or experiencing errors */
    MCPServerStatus["DISCONNECTED"] = "disconnected";
    /** Server is actively disconnecting */
    MCPServerStatus["DISCONNECTING"] = "disconnecting";
    /** Server is in the process of connecting */
    MCPServerStatus["CONNECTING"] = "connecting";
    /** Server is connected and ready to use */
    MCPServerStatus["CONNECTED"] = "connected";
})(MCPServerStatus || (MCPServerStatus = {}));
/**
 * Enum representing the overall MCP discovery state
 */
export var MCPDiscoveryState;
(function (MCPDiscoveryState) {
    /** Discovery has not started yet */
    MCPDiscoveryState["NOT_STARTED"] = "not_started";
    /** Discovery is currently in progress */
    MCPDiscoveryState["IN_PROGRESS"] = "in_progress";
    /** Discovery has completed (with or without errors) */
    MCPDiscoveryState["COMPLETED"] = "completed";
})(MCPDiscoveryState || (MCPDiscoveryState = {}));
/**
 * A client for a single MCP server.
 *
 * This class is responsible for connecting to, discovering tools from, and
 * managing the state of a single MCP server.
 */
export class McpClient {
    serverName;
    serverConfig;
    toolRegistry;
    promptRegistry;
    workspaceContext;
    debugMode;
    client;
    transport;
    status = MCPServerStatus.DISCONNECTED;
    constructor(serverName, serverConfig, toolRegistry, promptRegistry, workspaceContext, debugMode) {
        this.serverName = serverName;
        this.serverConfig = serverConfig;
        this.toolRegistry = toolRegistry;
        this.promptRegistry = promptRegistry;
        this.workspaceContext = workspaceContext;
        this.debugMode = debugMode;
    }
    /**
     * Connects to the MCP server.
     */
    async connect() {
        if (this.status !== MCPServerStatus.DISCONNECTED) {
            throw new Error(`Can only connect when the client is disconnected, current state is ${this.status}`);
        }
        this.updateStatus(MCPServerStatus.CONNECTING);
        try {
            this.client = await connectToMcpServer(this.serverName, this.serverConfig, this.debugMode, this.workspaceContext);
            const originalOnError = this.client.onerror;
            this.client.onerror = (error) => {
                if (this.status !== MCPServerStatus.CONNECTED) {
                    return;
                }
                if (originalOnError)
                    originalOnError(error);
                coreEvents.emitFeedback('error', `MCP ERROR (${this.serverName})`, error);
                this.updateStatus(MCPServerStatus.DISCONNECTED);
            };
            this.updateStatus(MCPServerStatus.CONNECTED);
        }
        catch (error) {
            this.updateStatus(MCPServerStatus.DISCONNECTED);
            throw error;
        }
    }
    /**
     * Discovers tools and prompts from the MCP server.
     */
    async discover(cliConfig) {
        this.assertConnected();
        const prompts = await this.discoverPrompts();
        const tools = await this.discoverTools(cliConfig);
        if (prompts.length === 0 && tools.length === 0) {
            throw new Error('No prompts or tools found on the server.');
        }
        for (const tool of tools) {
            this.toolRegistry.registerTool(tool);
        }
    }
    /**
     * Disconnects from the MCP server.
     */
    async disconnect() {
        if (this.status !== MCPServerStatus.CONNECTED) {
            return;
        }
        this.toolRegistry.removeMcpToolsByServer(this.serverName);
        this.updateStatus(MCPServerStatus.DISCONNECTING);
        const client = this.client;
        this.client = undefined;
        if (this.transport) {
            await this.transport.close();
        }
        if (client) {
            await client.close();
        }
        this.updateStatus(MCPServerStatus.DISCONNECTED);
    }
    /**
     * Returns the current status of the client.
     */
    getStatus() {
        return this.status;
    }
    updateStatus(status) {
        this.status = status;
        updateMCPServerStatus(this.serverName, status);
    }
    assertConnected() {
        if (this.status !== MCPServerStatus.CONNECTED) {
            throw new Error(`Client is not connected, must connect before interacting with the server. Current state is ${this.status}`);
        }
    }
    async discoverTools(cliConfig) {
        this.assertConnected();
        return discoverTools(this.serverName, this.serverConfig, this.client, cliConfig, this.toolRegistry.getMessageBus());
    }
    async discoverPrompts() {
        this.assertConnected();
        return discoverPrompts(this.serverName, this.client, this.promptRegistry);
    }
}
/**
 * Map to track the status of each MCP server within the core package
 */
const serverStatuses = new Map();
/**
 * Track the overall MCP discovery state
 */
let mcpDiscoveryState = MCPDiscoveryState.NOT_STARTED;
/**
 * Map to track which MCP servers have been discovered to require OAuth
 */
export const mcpServerRequiresOAuth = new Map();
const statusChangeListeners = [];
/**
 * Add a listener for MCP server status changes
 */
export function addMCPStatusChangeListener(listener) {
    statusChangeListeners.push(listener);
}
/**
 * Remove a listener for MCP server status changes
 */
export function removeMCPStatusChangeListener(listener) {
    const index = statusChangeListeners.indexOf(listener);
    if (index !== -1) {
        statusChangeListeners.splice(index, 1);
    }
}
/**
 * Update the status of an MCP server
 */
export function updateMCPServerStatus(serverName, status) {
    serverStatuses.set(serverName, status);
    // Notify all listeners
    for (const listener of statusChangeListeners) {
        listener(serverName, status);
    }
}
/**
 * Get the current status of an MCP server
 */
export function getMCPServerStatus(serverName) {
    return serverStatuses.get(serverName) || MCPServerStatus.DISCONNECTED;
}
/**
 * Get all MCP server statuses
 */
export function getAllMCPServerStatuses() {
    return new Map(serverStatuses);
}
/**
 * Get the current MCP discovery state
 */
export function getMCPDiscoveryState() {
    return mcpDiscoveryState;
}
/**
 * Extract WWW-Authenticate header from error message string.
 * This is a more robust approach than regex matching.
 *
 * @param errorString The error message string
 * @returns The www-authenticate header value if found, null otherwise
 */
function extractWWWAuthenticateHeader(errorString) {
    // Try multiple patterns to extract the header
    const patterns = [
        /www-authenticate:\s*([^\n\r]+)/i,
        /WWW-Authenticate:\s*([^\n\r]+)/i,
        /"www-authenticate":\s*"([^"]+)"/i,
        /'www-authenticate':\s*'([^']+)'/i,
    ];
    for (const pattern of patterns) {
        const match = errorString.match(pattern);
        if (match) {
            return match[1].trim();
        }
    }
    return null;
}
/**
 * Handle automatic OAuth discovery and authentication for a server.
 *
 * @param mcpServerName The name of the MCP server
 * @param mcpServerConfig The MCP server configuration
 * @param wwwAuthenticate The www-authenticate header value
 * @returns True if OAuth was successfully configured and authenticated, false otherwise
 */
async function handleAutomaticOAuth(mcpServerName, mcpServerConfig, wwwAuthenticate) {
    try {
        debugLogger.log(`🔐 '${mcpServerName}' requires OAuth authentication`);
        // Always try to parse the resource metadata URI from the www-authenticate header
        let oauthConfig;
        const resourceMetadataUri = OAuthUtils.parseWWWAuthenticateHeader(wwwAuthenticate);
        if (resourceMetadataUri) {
            oauthConfig = await OAuthUtils.discoverOAuthConfig(resourceMetadataUri);
        }
        else if (hasNetworkTransport(mcpServerConfig)) {
            // Fallback: try to discover OAuth config from the base URL
            const serverUrl = new URL(mcpServerConfig.httpUrl || mcpServerConfig.url);
            const baseUrl = `${serverUrl.protocol}//${serverUrl.host}`;
            oauthConfig = await OAuthUtils.discoverOAuthConfig(baseUrl);
        }
        if (!oauthConfig) {
            coreEvents.emitFeedback('error', `Could not configure OAuth for '${mcpServerName}' - please authenticate manually with /mcp auth ${mcpServerName}`);
            return false;
        }
        // OAuth configuration discovered - proceed with authentication
        // Create OAuth configuration for authentication
        const oauthAuthConfig = {
            enabled: true,
            authorizationUrl: oauthConfig.authorizationUrl,
            tokenUrl: oauthConfig.tokenUrl,
            scopes: oauthConfig.scopes || [],
        };
        // Perform OAuth authentication
        // Pass the server URL for proper discovery
        const serverUrl = mcpServerConfig.httpUrl || mcpServerConfig.url;
        debugLogger.log(`Starting OAuth authentication for server '${mcpServerName}'...`);
        const authProvider = new MCPOAuthProvider(new MCPOAuthTokenStorage());
        await authProvider.authenticate(mcpServerName, oauthAuthConfig, serverUrl);
        debugLogger.log(`OAuth authentication successful for server '${mcpServerName}'`);
        return true;
    }
    catch (error) {
        coreEvents.emitFeedback('error', `Failed to handle automatic OAuth for server '${mcpServerName}': ${getErrorMessage(error)}`, error);
        return false;
    }
}
/**
 * Create a transport with OAuth token for the given server configuration.
 *
 * @param mcpServerName The name of the MCP server
 * @param mcpServerConfig The MCP server configuration
 * @param accessToken The OAuth access token
 * @returns The transport with OAuth token, or null if creation fails
 */
async function createTransportWithOAuth(mcpServerName, mcpServerConfig, accessToken) {
    try {
        if (mcpServerConfig.httpUrl) {
            // Create HTTP transport with OAuth token
            const oauthTransportOptions = {
                requestInit: {
                    headers: {
                        ...mcpServerConfig.headers,
                        Authorization: `Bearer ${accessToken}`,
                    },
                },
            };
            return new StreamableHTTPClientTransport(new URL(mcpServerConfig.httpUrl), oauthTransportOptions);
        }
        else if (mcpServerConfig.url) {
            // Create SSE transport with OAuth token in Authorization header
            return new SSEClientTransport(new URL(mcpServerConfig.url), {
                requestInit: {
                    headers: {
                        ...mcpServerConfig.headers,
                        Authorization: `Bearer ${accessToken}`,
                    },
                },
            });
        }
        return null;
    }
    catch (error) {
        coreEvents.emitFeedback('error', `Failed to create OAuth transport for server '${mcpServerName}': ${getErrorMessage(error)}`, error);
        return null;
    }
}
/**
 * Discovers tools from all configured MCP servers and registers them with the tool registry.
 * It orchestrates the connection and discovery process for each server defined in the
 * configuration, as well as any server specified via a command-line argument.
 *
 * @param mcpServers A record of named MCP server configurations.
 * @param mcpServerCommand An optional command string for a dynamically specified MCP server.
 * @param toolRegistry The central registry where discovered tools will be registered.
 * @returns A promise that resolves when the discovery process has been attempted for all servers.
 */
export async function discoverMcpTools(mcpServers, mcpServerCommand, toolRegistry, promptRegistry, debugMode, workspaceContext, cliConfig) {
    mcpDiscoveryState = MCPDiscoveryState.IN_PROGRESS;
    try {
        mcpServers = populateMcpServerCommand(mcpServers, mcpServerCommand);
        const discoveryPromises = Object.entries(mcpServers).map(([mcpServerName, mcpServerConfig]) => connectAndDiscover(mcpServerName, mcpServerConfig, toolRegistry, promptRegistry, debugMode, workspaceContext, cliConfig));
        await Promise.all(discoveryPromises);
    }
    finally {
        mcpDiscoveryState = MCPDiscoveryState.COMPLETED;
    }
}
/** Visible for Testing */
export function populateMcpServerCommand(mcpServers, mcpServerCommand) {
    if (mcpServerCommand) {
        const cmd = mcpServerCommand;
        const args = parse(cmd, process.env);
        if (args.some((arg) => typeof arg !== 'string')) {
            throw new Error('failed to parse mcpServerCommand: ' + cmd);
        }
        // use generic server name 'mcp'
        mcpServers['mcp'] = {
            command: args[0],
            args: args.slice(1),
        };
    }
    return mcpServers;
}
/**
 * Connects to an MCP server and discovers available tools, registering them with the tool registry.
 * This function handles the complete lifecycle of connecting to a server, discovering tools,
 * and cleaning up resources if no tools are found.
 *
 * @param mcpServerName The name identifier for this MCP server
 * @param mcpServerConfig Configuration object containing connection details
 * @param toolRegistry The registry to register discovered tools with
 * @returns Promise that resolves when discovery is complete
 */
export async function connectAndDiscover(mcpServerName, mcpServerConfig, toolRegistry, promptRegistry, debugMode, workspaceContext, cliConfig) {
    updateMCPServerStatus(mcpServerName, MCPServerStatus.CONNECTING);
    let mcpClient;
    try {
        mcpClient = await connectToMcpServer(mcpServerName, mcpServerConfig, debugMode, workspaceContext);
        mcpClient.onerror = (error) => {
            coreEvents.emitFeedback('error', `MCP ERROR (${mcpServerName}):`, error);
            updateMCPServerStatus(mcpServerName, MCPServerStatus.DISCONNECTED);
        };
        // Attempt to discover both prompts and tools
        const prompts = await discoverPrompts(mcpServerName, mcpClient, promptRegistry);
        const tools = await discoverTools(mcpServerName, mcpServerConfig, mcpClient, cliConfig, toolRegistry.getMessageBus());
        // If we have neither prompts nor tools, it's a failed discovery
        if (prompts.length === 0 && tools.length === 0) {
            throw new Error('No prompts or tools found on the server.');
        }
        // If we found anything, the server is connected
        updateMCPServerStatus(mcpServerName, MCPServerStatus.CONNECTED);
        // Register any discovered tools
        for (const tool of tools) {
            toolRegistry.registerTool(tool);
        }
    }
    catch (error) {
        if (mcpClient) {
            mcpClient.close();
        }
        coreEvents.emitFeedback('error', `Error connecting to MCP server '${mcpServerName}': ${getErrorMessage(error)}`, error);
        updateMCPServerStatus(mcpServerName, MCPServerStatus.DISCONNECTED);
    }
}
/**
 * Discovers and sanitizes tools from a connected MCP client.
 * It retrieves function declarations from the client, filters out disabled tools,
 * generates valid names for them, and wraps them in `DiscoveredMCPTool` instances.
 *
 * @param mcpServerName The name of the MCP server.
 * @param mcpServerConfig The configuration for the MCP server.
 * @param mcpClient The active MCP client instance.
 * @param cliConfig The CLI configuration object.
 * @param messageBus Optional message bus for policy engine integration.
 * @returns A promise that resolves to an array of discovered and enabled tools.
 * @throws An error if no enabled tools are found or if the server provides invalid function declarations.
 */
export async function discoverTools(mcpServerName, mcpServerConfig, mcpClient, cliConfig, messageBus) {
    try {
        // Only request tools if the server supports them.
        if (mcpClient.getServerCapabilities()?.tools == null)
            return [];
        const mcpCallableTool = mcpToTool(mcpClient, {
            timeout: mcpServerConfig.timeout ?? MCP_DEFAULT_TIMEOUT_MSEC,
        });
        const tool = await mcpCallableTool.tool();
        if (!Array.isArray(tool.functionDeclarations)) {
            // This is a valid case for a prompt-only server
            return [];
        }
        const discoveredTools = [];
        for (const funcDecl of tool.functionDeclarations) {
            try {
                if (!isEnabled(funcDecl, mcpServerName, mcpServerConfig)) {
                    continue;
                }
                const tool = new DiscoveredMCPTool(mcpCallableTool, mcpServerName, funcDecl.name, funcDecl.description ?? '', funcDecl.parametersJsonSchema ?? { type: 'object', properties: {} }, mcpServerConfig.trust, undefined, cliConfig, mcpServerConfig.extension?.name, mcpServerConfig.extension?.id, messageBus);
                if (cliConfig.getDebugMode?.() &&
                    cliConfig.getEnableMessageBusIntegration?.()) {
                    debugLogger.log(`[DEBUG] Discovered MCP tool '${funcDecl.name}' from server '${mcpServerName}' with messageBus: ${messageBus ? 'YES' : 'NO'}`);
                }
                discoveredTools.push(tool);
            }
            catch (error) {
                coreEvents.emitFeedback('error', `Error discovering tool: '${funcDecl.name}' from MCP server '${mcpServerName}': ${error.message}`, error);
            }
        }
        return discoveredTools;
    }
    catch (error) {
        if (error instanceof Error &&
            !error.message?.includes('Method not found')) {
            coreEvents.emitFeedback('error', `Error discovering tools from ${mcpServerName}: ${getErrorMessage(error)}`, error);
        }
        return [];
    }
}
/**
 * Discovers and logs prompts from a connected MCP client.
 * It retrieves prompt declarations from the client and logs their names.
 *
 * @param mcpServerName The name of the MCP server.
 * @param mcpClient The active MCP client instance.
 */
export async function discoverPrompts(mcpServerName, mcpClient, promptRegistry) {
    try {
        // Only request prompts if the server supports them.
        if (mcpClient.getServerCapabilities()?.prompts == null)
            return [];
        const response = await mcpClient.request({ method: 'prompts/list', params: {} }, ListPromptsResultSchema);
        for (const prompt of response.prompts) {
            promptRegistry.registerPrompt({
                ...prompt,
                serverName: mcpServerName,
                invoke: (params) => invokeMcpPrompt(mcpServerName, mcpClient, prompt.name, params),
            });
        }
        return response.prompts;
    }
    catch (error) {
        // It's okay if this fails, not all servers will have prompts.
        // Don't log an error if the method is not found, which is a common case.
        if (error instanceof Error &&
            !error.message?.includes('Method not found')) {
            coreEvents.emitFeedback('error', `Error discovering prompts from ${mcpServerName}: ${getErrorMessage(error)}`, error);
        }
        return [];
    }
}
/**
 * Invokes a prompt on a connected MCP client.
 *
 * @param mcpServerName The name of the MCP server.
 * @param mcpClient The active MCP client instance.
 * @param promptName The name of the prompt to invoke.
 * @param promptParams The parameters to pass to the prompt.
 * @returns A promise that resolves to the result of the prompt invocation.
 */
export async function invokeMcpPrompt(mcpServerName, mcpClient, promptName, promptParams) {
    try {
        const response = await mcpClient.request({
            method: 'prompts/get',
            params: {
                name: promptName,
                arguments: promptParams,
            },
        }, GetPromptResultSchema);
        return response;
    }
    catch (error) {
        if (error instanceof Error &&
            !error.message?.includes('Method not found')) {
            coreEvents.emitFeedback('error', `Error invoking prompt '${promptName}' from ${mcpServerName} ${promptParams}: ${getErrorMessage(error)}`, error);
        }
        throw error;
    }
}
/**
 * @visiblefortesting
 * Checks if the MCP server configuration has a network transport URL (SSE or HTTP).
 * @param config The MCP server configuration.
 * @returns True if a `url` or `httpUrl` is present, false otherwise.
 */
export function hasNetworkTransport(config) {
    return !!(config.url || config.httpUrl);
}
/**
 * Creates and connects an MCP client to a server based on the provided configuration.
 * It determines the appropriate transport (Stdio, SSE, or Streamable HTTP) and
 * establishes a connection. It also applies a patch to handle request timeouts.
 *
 * @param mcpServerName The name of the MCP server, used for logging and identification.
 * @param mcpServerConfig The configuration specifying how to connect to the server.
 * @returns A promise that resolves to a connected MCP `Client` instance.
 * @throws An error if the connection fails or the configuration is invalid.
 */
export async function connectToMcpServer(mcpServerName, mcpServerConfig, debugMode, workspaceContext) {
    const mcpClient = new Client({
        name: 'gemini-cli-mcp-client',
        version: '0.0.1',
    });
    mcpClient.registerCapabilities({
        roots: {
            listChanged: true,
        },
    });
    mcpClient.setRequestHandler(ListRootsRequestSchema, async () => {
        const roots = [];
        for (const dir of workspaceContext.getDirectories()) {
            roots.push({
                uri: pathToFileURL(dir).toString(),
                name: basename(dir),
            });
        }
        return {
            roots,
        };
    });
    let unlistenDirectories = workspaceContext.onDirectoriesChanged(async () => {
        try {
            await mcpClient.notification({
                method: 'notifications/roots/list_changed',
            });
        }
        catch (_) {
            // If this fails, its almost certainly because the connection was closed
            // and we should just stop listening for future directory changes.
            unlistenDirectories?.();
            unlistenDirectories = undefined;
        }
    });
    // Attempt to pro-actively unsubscribe if the mcp client closes. This API is
    // very brittle though so we don't have any guarantees, hence the try/catch
    // above as well.
    //
    // Be a good steward and don't just bash over onclose.
    const oldOnClose = mcpClient.onclose;
    mcpClient.onclose = () => {
        oldOnClose?.();
        unlistenDirectories?.();
        unlistenDirectories = undefined;
    };
    try {
        const transport = await createTransport(mcpServerName, mcpServerConfig, debugMode);
        try {
            await mcpClient.connect(transport, {
                timeout: mcpServerConfig.timeout ?? MCP_DEFAULT_TIMEOUT_MSEC,
            });
            return mcpClient;
        }
        catch (error) {
            await transport.close();
            throw error;
        }
    }
    catch (error) {
        // Check if this is a 401 error that might indicate OAuth is required
        const errorString = String(error);
        if (errorString.includes('401') && hasNetworkTransport(mcpServerConfig)) {
            mcpServerRequiresOAuth.set(mcpServerName, true);
            // Only trigger automatic OAuth discovery for HTTP servers or when OAuth is explicitly configured
            // For SSE servers, we should not trigger new OAuth flows automatically
            const shouldTriggerOAuth = mcpServerConfig.httpUrl || mcpServerConfig.oauth?.enabled;
            if (!shouldTriggerOAuth) {
                // For SSE servers without explicit OAuth config, if a token was found but rejected, report it accurately.
                const tokenStorage = new MCPOAuthTokenStorage();
                const credentials = await tokenStorage.getCredentials(mcpServerName);
                if (credentials) {
                    const authProvider = new MCPOAuthProvider(tokenStorage);
                    const hasStoredTokens = await authProvider.getValidToken(mcpServerName, {
                        // Pass client ID if available
                        clientId: credentials.clientId,
                    });
                    if (hasStoredTokens) {
                        coreEvents.emitFeedback('error', `Stored OAuth token for SSE server '${mcpServerName}' was rejected. ` +
                            `Please re-authenticate using: /mcp auth ${mcpServerName}`);
                    }
                    else {
                        coreEvents.emitFeedback('error', `401 error received for SSE server '${mcpServerName}' without OAuth configuration. ` +
                            `Please authenticate using: /mcp auth ${mcpServerName}`);
                    }
                }
                throw new Error(`401 error received for SSE server '${mcpServerName}' without OAuth configuration. ` +
                    `Please authenticate using: /mcp auth ${mcpServerName}`);
            }
            // Try to extract www-authenticate header from the error
            let wwwAuthenticate = extractWWWAuthenticateHeader(errorString);
            // If we didn't get the header from the error string, try to get it from the server
            if (!wwwAuthenticate && hasNetworkTransport(mcpServerConfig)) {
                debugLogger.log(`No www-authenticate header in error, trying to fetch it from server...`);
                try {
                    const urlToFetch = mcpServerConfig.httpUrl || mcpServerConfig.url;
                    const response = await fetch(urlToFetch, {
                        method: 'HEAD',
                        headers: {
                            Accept: mcpServerConfig.httpUrl
                                ? 'application/json'
                                : 'text/event-stream',
                        },
                        signal: AbortSignal.timeout(5000),
                    });
                    if (response.status === 401) {
                        wwwAuthenticate = response.headers.get('www-authenticate');
                        if (wwwAuthenticate) {
                            debugLogger.log(`Found www-authenticate header from server: ${wwwAuthenticate}`);
                        }
                    }
                }
                catch (fetchError) {
                    debugLogger.debug(`Failed to fetch www-authenticate header: ${getErrorMessage(fetchError)}`);
                }
            }
            if (wwwAuthenticate) {
                debugLogger.log(`Received 401 with www-authenticate header: ${wwwAuthenticate}`);
                // Try automatic OAuth discovery and authentication
                const oauthSuccess = await handleAutomaticOAuth(mcpServerName, mcpServerConfig, wwwAuthenticate);
                if (oauthSuccess) {
                    // Retry connection with OAuth token
                    debugLogger.log(`Retrying connection to '${mcpServerName}' with OAuth token...`);
                    // Get the valid token - we need to create a proper OAuth config
                    // The token should already be available from the authentication process
                    const tokenStorage = new MCPOAuthTokenStorage();
                    const credentials = await tokenStorage.getCredentials(mcpServerName);
                    if (credentials) {
                        const authProvider = new MCPOAuthProvider(tokenStorage);
                        const accessToken = await authProvider.getValidToken(mcpServerName, {
                            // Pass client ID if available
                            clientId: credentials.clientId,
                        });
                        if (accessToken) {
                            // Create transport with OAuth token
                            const oauthTransport = await createTransportWithOAuth(mcpServerName, mcpServerConfig, accessToken);
                            if (oauthTransport) {
                                await mcpClient.connect(oauthTransport, {
                                    timeout: mcpServerConfig.timeout ?? MCP_DEFAULT_TIMEOUT_MSEC,
                                });
                                // Connection successful with OAuth
                                return mcpClient;
                            }
                            else {
                                throw new Error(`Failed to create OAuth transport for server '${mcpServerName}'`);
                            }
                        }
                        else {
                            throw new Error(`Failed to get OAuth token for server '${mcpServerName}'`);
                        }
                    }
                    else {
                        throw new Error(`Failed to get credentials for server '${mcpServerName}' after successful OAuth authentication`);
                    }
                }
                else {
                    throw new Error(`Failed to handle automatic OAuth for server '${mcpServerName}'`);
                }
            }
            else {
                // No www-authenticate header found, but we got a 401
                // Only try OAuth discovery for HTTP servers or when OAuth is explicitly configured
                // For SSE servers, we should not trigger new OAuth flows automatically
                const shouldTryDiscovery = mcpServerConfig.httpUrl || mcpServerConfig.oauth?.enabled;
                if (!shouldTryDiscovery) {
                    const tokenStorage = new MCPOAuthTokenStorage();
                    const credentials = await tokenStorage.getCredentials(mcpServerName);
                    if (credentials) {
                        const authProvider = new MCPOAuthProvider(tokenStorage);
                        const hasStoredTokens = await authProvider.getValidToken(mcpServerName, {
                            // Pass client ID if available
                            clientId: credentials.clientId,
                        });
                        if (hasStoredTokens) {
                            coreEvents.emitFeedback('error', `Stored OAuth token for SSE server '${mcpServerName}' was rejected. ` +
                                `Please re-authenticate using: /mcp auth ${mcpServerName}`);
                        }
                        else {
                            coreEvents.emitFeedback('error', `401 error received for SSE server '${mcpServerName}' without OAuth configuration. ` +
                                `Please authenticate using: /mcp auth ${mcpServerName}`);
                        }
                    }
                    throw new Error(`401 error received for SSE server '${mcpServerName}' without OAuth configuration. ` +
                        `Please authenticate using: /mcp auth ${mcpServerName}`);
                }
                // For SSE/HTTP servers, try to discover OAuth configuration from the base URL
                debugLogger.log(`🔍 Attempting OAuth discovery for '${mcpServerName}'...`);
                if (hasNetworkTransport(mcpServerConfig)) {
                    const serverUrl = new URL(mcpServerConfig.httpUrl || mcpServerConfig.url);
                    const baseUrl = `${serverUrl.protocol}//${serverUrl.host}`;
                    // Try to discover OAuth configuration from the base URL
                    const oauthConfig = await OAuthUtils.discoverOAuthConfig(baseUrl);
                    if (oauthConfig) {
                        debugLogger.log(`Discovered OAuth configuration from base URL for server '${mcpServerName}'`);
                        // Create OAuth configuration for authentication
                        const oauthAuthConfig = {
                            enabled: true,
                            authorizationUrl: oauthConfig.authorizationUrl,
                            tokenUrl: oauthConfig.tokenUrl,
                            scopes: oauthConfig.scopes || [],
                        };
                        // Perform OAuth authentication
                        // Pass the server URL for proper discovery
                        const authServerUrl = mcpServerConfig.httpUrl || mcpServerConfig.url;
                        debugLogger.log(`Starting OAuth authentication for server '${mcpServerName}'...`);
                        const authProvider = new MCPOAuthProvider(new MCPOAuthTokenStorage());
                        await authProvider.authenticate(mcpServerName, oauthAuthConfig, authServerUrl);
                        // Retry connection with OAuth token
                        const tokenStorage = new MCPOAuthTokenStorage();
                        const credentials = await tokenStorage.getCredentials(mcpServerName);
                        if (credentials) {
                            const authProvider = new MCPOAuthProvider(tokenStorage);
                            const accessToken = await authProvider.getValidToken(mcpServerName, {
                                // Pass client ID if available
                                clientId: credentials.clientId,
                            });
                            if (accessToken) {
                                // Create transport with OAuth token
                                const oauthTransport = await createTransportWithOAuth(mcpServerName, mcpServerConfig, accessToken);
                                if (oauthTransport) {
                                    await mcpClient.connect(oauthTransport, {
                                        timeout: mcpServerConfig.timeout ?? MCP_DEFAULT_TIMEOUT_MSEC,
                                    });
                                    // Connection successful with OAuth
                                    return mcpClient;
                                }
                                else {
                                    throw new Error(`Failed to create OAuth transport for server '${mcpServerName}'`);
                                }
                            }
                            else {
                                throw new Error(`Failed to get OAuth token for server '${mcpServerName}'`);
                            }
                        }
                        else {
                            throw new Error(`Failed to get stored credentials for server '${mcpServerName}'`);
                        }
                    }
                    else {
                        throw new Error(`OAuth configuration failed for '${mcpServerName}'. Please authenticate manually with /mcp auth ${mcpServerName}`);
                    }
                }
                else {
                    throw new Error(`MCP server '${mcpServerName}' requires authentication. Please configure OAuth or check server settings.`);
                }
            }
        }
        else {
            // Handle other connection errors
            // Create a concise error message
            const errorMessage = error.message || String(error);
            const isNetworkError = errorMessage.includes('ENOTFOUND') ||
                errorMessage.includes('ECONNREFUSED');
            let conciseError;
            if (isNetworkError) {
                conciseError = `Cannot connect to '${mcpServerName}' - server may be down or URL incorrect`;
            }
            else {
                conciseError = `Connection failed for '${mcpServerName}': ${errorMessage}`;
            }
            if (process.env['SANDBOX']) {
                conciseError += ` (check sandbox availability)`;
            }
            throw new Error(conciseError);
        }
    }
}
/** Visible for Testing */
export async function createTransport(mcpServerName, mcpServerConfig, debugMode) {
    if (mcpServerConfig.authProviderType ===
        AuthProviderType.SERVICE_ACCOUNT_IMPERSONATION) {
        const provider = new ServiceAccountImpersonationProvider(mcpServerConfig);
        const transportOptions = {
            authProvider: provider,
        };
        if (mcpServerConfig.httpUrl) {
            return new StreamableHTTPClientTransport(new URL(mcpServerConfig.httpUrl), transportOptions);
        }
        else if (mcpServerConfig.url) {
            // Default to SSE if only url is provided
            return new SSEClientTransport(new URL(mcpServerConfig.url), transportOptions);
        }
        throw new Error('No URL configured for ServiceAccountImpersonation MCP Server');
    }
    if (mcpServerConfig.authProviderType === AuthProviderType.GOOGLE_CREDENTIALS) {
        const provider = new GoogleCredentialProvider(mcpServerConfig);
        const transportOptions = {
            authProvider: provider,
        };
        if (mcpServerConfig.httpUrl) {
            return new StreamableHTTPClientTransport(new URL(mcpServerConfig.httpUrl), transportOptions);
        }
        else if (mcpServerConfig.url) {
            return new SSEClientTransport(new URL(mcpServerConfig.url), transportOptions);
        }
        throw new Error('No URL configured for Google Credentials MCP server');
    }
    // Check if we have OAuth configuration or stored tokens
    let accessToken = null;
    let hasOAuthConfig = mcpServerConfig.oauth?.enabled;
    if (hasOAuthConfig && mcpServerConfig.oauth) {
        const tokenStorage = new MCPOAuthTokenStorage();
        const authProvider = new MCPOAuthProvider(tokenStorage);
        accessToken = await authProvider.getValidToken(mcpServerName, mcpServerConfig.oauth);
        if (!accessToken) {
            throw new Error(`MCP server '${mcpServerName}' requires OAuth authentication. ` +
                `Please authenticate using the /mcp auth command.`);
        }
    }
    else {
        // Check if we have stored OAuth tokens for this server (from previous authentication)
        const tokenStorage = new MCPOAuthTokenStorage();
        const credentials = await tokenStorage.getCredentials(mcpServerName);
        if (credentials) {
            const authProvider = new MCPOAuthProvider(tokenStorage);
            accessToken = await authProvider.getValidToken(mcpServerName, {
                // Pass client ID if available
                clientId: credentials.clientId,
            });
            if (accessToken) {
                hasOAuthConfig = true;
                debugLogger.log(`Found stored OAuth token for server '${mcpServerName}'`);
            }
        }
    }
    if (mcpServerConfig.httpUrl) {
        const transportOptions = {};
        // Set up headers with OAuth token if available
        if (hasOAuthConfig && accessToken) {
            transportOptions.requestInit = {
                headers: {
                    ...mcpServerConfig.headers,
                    Authorization: `Bearer ${accessToken}`,
                },
            };
        }
        else if (mcpServerConfig.headers) {
            transportOptions.requestInit = {
                headers: mcpServerConfig.headers,
            };
        }
        return new StreamableHTTPClientTransport(new URL(mcpServerConfig.httpUrl), transportOptions);
    }
    if (mcpServerConfig.url) {
        const transportOptions = {};
        // Set up headers with OAuth token if available
        if (hasOAuthConfig && accessToken) {
            transportOptions.requestInit = {
                headers: {
                    ...mcpServerConfig.headers,
                    Authorization: `Bearer ${accessToken}`,
                },
            };
        }
        else if (mcpServerConfig.headers) {
            transportOptions.requestInit = {
                headers: mcpServerConfig.headers,
            };
        }
        return new SSEClientTransport(new URL(mcpServerConfig.url), transportOptions);
    }
    if (mcpServerConfig.command) {
        const transport = new StdioClientTransport({
            command: mcpServerConfig.command,
            args: mcpServerConfig.args || [],
            env: {
                ...process.env,
                ...(mcpServerConfig.env || {}),
            },
            cwd: mcpServerConfig.cwd,
            stderr: 'pipe',
        });
        if (debugMode) {
            transport.stderr.on('data', (data) => {
                const stderrStr = data.toString().trim();
                debugLogger.debug(`[DEBUG] [MCP STDERR (${mcpServerName})]: `, stderrStr);
            });
        }
        return transport;
    }
    throw new Error(`Invalid configuration: missing httpUrl (for Streamable HTTP), url (for SSE), and command (for stdio).`);
}
/** Visible for testing */
export function isEnabled(funcDecl, mcpServerName, mcpServerConfig) {
    if (!funcDecl.name) {
        debugLogger.warn(`Discovered a function declaration without a name from MCP server '${mcpServerName}'. Skipping.`);
        return false;
    }
    const { includeTools, excludeTools } = mcpServerConfig;
    // excludeTools takes precedence over includeTools
    if (excludeTools && excludeTools.includes(funcDecl.name)) {
        return false;
    }
    return (!includeTools ||
        includeTools.some((tool) => tool === funcDecl.name || tool.startsWith(`${funcDecl.name}(`)));
}
//# sourceMappingURL=mcp-client.js.map