import { MCPServerRegistry, RegisteredMCPServer } from './mcp-server-registry';
import { ToolCapability } from '../../types/mcp-config';

/**
 * @interface ToolDefinition
 * @description Represents a tool provided by an MCP server.
 */
export interface ToolDefinition {
  name: string;
  serverName: string;
  capability: ToolCapability;
  // Add more properties like schema, usage, etc.
}

/**
 * @class ToolOrchestrator
 * @description Establishes the base orchestration system for discovering, registering, and executing MCP tools.
 */
export class ToolOrchestrator {
  private serverRegistry: MCPServerRegistry;
  private tools: Map<string, ToolDefinition> = new Map(); // toolName -> ToolDefinition

  constructor(serverRegistry: MCPServerRegistry) {
    this.serverRegistry = serverRegistry;
  }

  /**
   * Discovers and registers tools from all available MCP servers.
   * @returns {Promise<void>}
   */
  public async discoverAndRegisterTools(): Promise<void> {
    const servers = this.serverRegistry.listServers();
    for (const server of servers) {
      if (!server.disabled) {
        // In a real scenario, this would involve communicating with the MCP server
        // to get a list of its tools and their capabilities.
        // For now, we'll simulate tool discovery based on server capabilities.
        const discoveredTools = await this.simulateToolDiscovery(server);
        discoveredTools.forEach(tool => {
          this.tools.set(tool.name, tool);
          console.log(`Registered tool: ${tool.name} from server ${tool.serverName}`);
        });
      }
    }
    console.log('Tool Orchestrator: Tools discovered and registered.');
  }

  /**
   * Simulates tool discovery for a given MCP server.
   * In a real implementation, this would query the MCP server for its tools.
   * @param {RegisteredMCPServer} server The MCP server to query.
   * @returns {Promise<ToolDefinition[]>}
   * @private
   */
  private async simulateToolDiscovery(server: RegisteredMCPServer): Promise<ToolDefinition[]> {
    const tools: ToolDefinition[] = [];
    // Example: If a server has a 'file_management' capability, it might offer 'read_file', 'write_file' tools.
    server.capabilities.forEach(cap => {
      // This is a very basic simulation. Real discovery would be more complex.
      if (cap.name === 'file_management') {
        tools.push({
          name: 'read_file',
          serverName: server.name,
          capability: { name: 'read_file', description: 'Reads content from a file.' },
        });
        tools.push({
          name: 'write_file',
          serverName: server.name,
          capability: { name: 'write_file', description: 'Writes content to a file.' },
        });
      }
      // Add more simulated tools based on capabilities
    });
    return tools;
  }

  /**
   * Retrieves a registered tool by its name.
   * @param {string} toolName The name of the tool.
   * @returns {ToolDefinition | undefined}
   */
  public getTool(toolName: string): ToolDefinition | undefined {
    return this.tools.get(toolName);
  }

  /**
   * Executes a registered tool.
   * This is a placeholder for the actual execution logic.
   * @param {string} toolName The name of the tool to execute.
   * @param {any[]} args Arguments for the tool.
   * @returns {Promise<any>} The result of the tool execution.
   */
  public async executeTool(toolName: string, args: any[]): Promise<any> {
    const tool = this.getTool(toolName);
    if (!tool) {
      throw new Error(`Tool "${toolName}" not found.`);
    }

    const server = this.serverRegistry.getServer(tool.serverName);
    if (!server || server.disabled) {
      throw new Error(`Server for tool "${toolName}" is not available or disabled.`);
    }

    console.log(`Executing tool "${toolName}" on server "${server.name}" with args:`, args);
    // In a real scenario, this would involve sending a command to the MCP server
    // to execute the tool. This is a placeholder for that communication.
    try {
      // Simulate tool execution
      const result = await this.simulateToolExecution(tool, args);
      return result;
    } catch (error: any) {
      console.error(`Error executing tool "${toolName}": ${error.message}`);
      // Implement fallback mechanisms here
      throw new Error(`Tool execution failed: ${error.message}`);
    }
  }

  /**
   * Simulates the execution of a tool.
   * @param {ToolDefinition} tool The tool to simulate.
   * @param {any[]} args Arguments for the tool.
   * @returns {Promise<any>}
   * @private
   */
  private async simulateToolExecution(tool: ToolDefinition, args: any[]): Promise<any> {
    // Basic simulation based on tool name
    switch (tool.name) {
      case 'read_file':
        console.log('Simulating read_file with args:', args);
        return `Content of simulated file for ${args[0]}`;
      case 'write_file':
        console.log('Simulating write_file with args:', args);
        return `Successfully wrote to simulated file ${args[0]}`;
      default:
        return `Simulated execution of ${tool.name} with args: ${JSON.stringify(args)}`;
    }
  }

  /**
   * Assesses and categorizes tool capabilities.
   * This method would typically analyze tool schemas or metadata.
   * @param {ToolDefinition} tool The tool to assess.
   * @returns {string[]}
   */
  public assessToolCapabilities(tool: ToolDefinition): string[] {
    // In a real scenario, this would parse tool schemas to extract capabilities.
    // For now, it returns the capability defined in the ToolDefinition.
    return [tool.capability.name];
  }
}