/**
 * mcpService.js
 * 
 * Handles the registration of Model Context Protocol (MCP) tools for the browser.
 * This allows AI agents to interact with the Hub UI as a set of structured tools.
 */

class McpService {
    constructor() {
        this.isSupported = typeof window !== 'undefined' && !!window.navigator?.modelContext;
        this.registeredTools = new Set();
        
        if (!this.isSupported) {
            console.warn('[MCP] WebMCP is not natively supported in this browser. Tools will not be exposed.');
        }
    }

    /**
     * Registers a tool with the browser's model context.
     * @param {Object} tool - Tool definition following the MCP spec.
     */
    registerTool(tool) {
        if (!this.isSupported) return;

        try {
            window.navigator.modelContext.registerTool(tool);
            this.registeredTools.add(tool.name);
            console.log(`[MCP] Registered tool: ${tool.name}`);
        } catch (error) {
            console.error(`[MCP] Failed to register tool ${tool.name}:`, error);
        }
    }

    /**
     * Unregisters a tool.
     * @param {string} toolName 
     */
    unregisterTool(toolName) {
        if (!this.isSupported) return;

        try {
            // Note: Native API might use different unregistration logic depending on the draft
            if (window.navigator.modelContext.unregisterTool) {
                window.navigator.modelContext.unregisterTool(toolName);
            }
            this.registeredTools.delete(toolName);
            console.log(`[MCP] Unregistered tool: ${toolName}`);
        } catch (error) {
            console.error(`[MCP] Failed to unregister tool ${toolName}:`, error);
        }
    }

    /**
     * Returns whether the protocol is active and supported.
     */
    isActive() {
        return this.isSupported;
    }
}

const mcpService = new McpService();
export default mcpService;