import { Logger } from '../../utils/logger';
import { WasmNeuralEngine } from '../neural/wasm-engine';

/**
 * @interface WasmManagerConfig
 * @description Configuration for the WASM Performance Manager.
 */
export interface WasmManagerConfig {
  maxWorkers: number;
  memoryAllocationStrategy: 'shared' | 'dedicated';
  // Add configuration for WASM module paths, resource limits, etc.
}

/**
 * @interface WasmManagerOperations
 * @description Defines operations for managing WASM module lifecycle and optimization.
 */
export interface WasmManagerOperations {
  loadWasmModule(modulePath: string): Promise<WebAssembly.Module>;
  executeWasmFunction(module: WebAssembly.Module, functionName: string, args: any[]): Promise<any>;
  offloadTaskToWasm(taskData: any): Promise<any>;
  profileWasmModule(module: WebAssembly.Module, durationSeconds: number): Promise<any>;
  autoScaleWasmWorkers(demand: number): Promise<void>;
}

/**
 * @class WasmPerformanceManager
 * @description Manages WebAssembly module lifecycle, memory, and task offloading for performance enhancement.
 */
export class WasmPerformanceManager implements WasmManagerOperations {
  private config: WasmManagerConfig;
  private logger: Logger;
  private wasmEngine: WasmNeuralEngine;
  private loadedModules: Map<string, WebAssembly.Module> = new Map();

  constructor(config: WasmManagerConfig, wasmEngine: WasmNeuralEngine) {
    this.config = config;
    this.logger = new Logger('WasmPerformanceManager');
    this.wasmEngine = wasmEngine;
    this.logger.info('WASM Performance Manager initialized.');
  }

  /**
   * Loads a WebAssembly module.
   * @param {string} modulePath The path to the WASM binary or WAT file.
   * @returns {Promise<WebAssembly.Module>} The loaded WebAssembly module.
   */
  public async loadWasmModule(modulePath: string): Promise<WebAssembly.Module> {
    if (this.loadedModules.has(modulePath)) {
      this.logger.debug(`WASM module ${modulePath} already loaded.`);
      return this.loadedModules.get(modulePath)!;
    }
    this.logger.info(`Loading WASM module from: ${modulePath}...`);
    // Simulate loading and compiling WASM module
    const simulatedModule = await this.wasmEngine.compileWasmModule('dummy_wasm_source');
    this.loadedModules.set(modulePath, simulatedModule);
    this.logger.debug(`WASM module ${modulePath} loaded.`);
    return simulatedModule;
  }

  /**
   * Executes a function within a loaded WebAssembly module.
   * @param {WebAssembly.Module} module The loaded WASM module.
   * @param {string} functionName The name of the function to execute.
   * @param {any[]} args Arguments to pass to the WASM function.
   * @returns {Promise<any>} The result of the WASM function execution.
   */
  public async executeWasmFunction(module: WebAssembly.Module, functionName: string, args: any[]): Promise<any> {
    this.logger.info(`Executing WASM function ${functionName} (conceptual)...`);
    // In a real scenario, this would involve instantiating the module and calling its exports.
    await new Promise(resolve => setTimeout(resolve, 20)); // Simulate execution
    const simulatedResult = `WASM function ${functionName} executed with args: ${JSON.stringify(args)}`;
    this.logger.debug(simulatedResult);
    return simulatedResult;
  }

  /**
   * Offloads a CPU-intensive task to a WASM module for accelerated processing.
   * @param {any} taskData The data for the task to offload.
   * @returns {Promise<any>} The result from the WASM-accelerated task.
   */
  public async offloadTaskToWasm(taskData: any): Promise<any> {
    this.logger.info('Offloading task to WASM (conceptual)...', taskData);
    // This would involve selecting an appropriate WASM module and executing a function.
    const simulatedResult = await this.executeWasmFunction({} as WebAssembly.Module, 'process_data', [taskData]);
    this.logger.debug('Task offloaded to WASM.', simulatedResult);
    return simulatedResult;
  }

  /**
   * Profiles a WASM module's performance.
   * @param {WebAssembly.Module} module The WASM module to profile.
   * @param {number} durationSeconds The duration for profiling.
   * @returns {Promise<any>} Profiling results.
   */
  public async profileWasmModule(module: WebAssembly.Module, durationSeconds: number): Promise<any> {
    this.logger.info(`Profiling WASM module for ${durationSeconds} seconds (conceptual)...`);
    // This would involve using WASM profiling tools.
    await new Promise(resolve => setTimeout(resolve, durationSeconds * 1000));
    const profileResult = { cpuUsage: 'high', memoryUsage: 'low', executionTime: 'fast' };
    this.logger.debug('WASM module profiling complete.', profileResult);
    return profileResult;
  }

  /**
   * Auto-scales WASM workers based on computational demand (conceptual).
   * @param {number} demand The current computational demand.
   * @returns {Promise<void>}
   */
  public async autoScaleWasmWorkers(demand: number): Promise<void> {
    this.logger.info(`Auto-scaling WASM workers based on demand: ${demand} (conceptual)...`);
    // This would involve dynamically adjusting the number of Web Workers or underlying compute resources
    // that host WASM modules.
    await new Promise(resolve => setTimeout(resolve, 100));
    this.logger.debug('WASM workers auto-scaled.');
  }
}