/**
 * Main Application Entry Point
 *
 * This is the main entry point for the CLI application.
 * It integrates all the deobfuscated components and provides
 * the primary interface for the shell command processing system.
 */

const { ShellParser } = require("./core/shell-parser");
const { HttpClient } = require("./network/http-client");
const { performanceMonitor } = require("./instrumentation/performance-monitor");
const { moduleLoader } = require("./module-system/module-loader");
const { getGlobalObject } = require("./platform/global-object");
const { detectRuntime } = require("./platform/environment-detection");
const { TimingUtils } = require("./platform/compatibility");
const { generateUuid4 } = require("./utils/uuid");
const pathUtils = require("./utils/path-utils");
const stringUtils = require("./utils/string-utils");

/**
 * Main CLI Application class
 */
class CLIApplication {
  constructor(options = {}) {
    this.options = {
      debug: options.debug || false,
      timeout: options.timeout || 30000,
      maxConcurrency: options.maxConcurrency || 10,
      ...options,
    };

    this.shellParser = new ShellParser();
    this.httpClient = new HttpClient();
    this.timingUtils = new TimingUtils();

    this.activeCommands = new Map();
    this.commandHistory = [];
    this.environment = detectRuntime();

    this.init();
  }

  /**
   * Initialize the application
   */
  init() {
    this.setupGlobalErrorHandlers();
    this.setupPerformanceMonitoring();
    this.logStartupInfo();
  }

  /**
   * Setup global error handlers
   */
  setupGlobalErrorHandlers() {
    const global = getGlobalObject();

    if (typeof global.addEventListener === "function") {
      global.addEventListener("error", (event) => {
        this.handleError(event.error, "global-error");
      });

      global.addEventListener("unhandledrejection", (event) => {
        this.handleError(event.reason, "unhandled-rejection");
      });
    }
  }

  /**
   * Setup performance monitoring
   */
  setupPerformanceMonitoring() {
    if (this.options.debug) {
      performanceMonitor.startTiming("application-lifecycle");
    }
  }

  /**
   * Log startup information
   */
  logStartupInfo() {
    if (this.options.debug) {
      console.log("CLI Application Starting...");
      console.log("Runtime:", this.environment.name, this.environment.version);
      console.log("Platform:", this.environment.platform);
      console.log("Features:", this.environment.features);
    }
  }

  /**
   * Execute a shell command
   * @param {string} command - Command to execute
   * @param {Object} context - Execution context
   * @returns {Promise<Object>} Execution result
   */
  async executeCommand(command, context = {}) {
    const commandId = generateUuid4();
    const timerId = performanceMonitor.startTiming(`command-${commandId}`);

    try {
      // Parse the command
      const parsed = this.shellParser.parseShellCommand(command, context.env);

      // Validate command
      if (!parsed.command) {
        throw new Error("Invalid command: empty or malformed");
      }

      // Track active command
      this.activeCommands.set(commandId, {
        command: parsed.command,
        args: parsed.args,
        startTime: Date.now(),
        timerId,
      });

      // Execute based on command type
      let result;
      if (this.isBuiltinCommand(parsed.command)) {
        result = await this.executeBuiltinCommand(parsed, context);
      } else {
        result = await this.executeExternalCommand(parsed, context);
      }

      // Add to history
      this.addToHistory(command, result);

      return result;
    } catch (error) {
      this.handleError(error, "command-execution", { command, commandId });
      throw error;
    } finally {
      // Cleanup
      this.activeCommands.delete(commandId);
      performanceMonitor.endTiming(timerId);
    }
  }

  /**
   * Check if command is a builtin
   * @param {string} command - Command name
   * @returns {boolean} True if builtin
   */
  isBuiltinCommand(command) {
    const builtins = [
      "cd",
      "pwd",
      "echo",
      "export",
      "set",
      "unset",
      "alias",
      "unalias",
      "history",
      "jobs",
      "help",
      "version",
      "exit",
      "quit",
    ];
    return builtins.includes(command);
  }

  /**
   * Execute builtin command
   * @param {Object} parsed - Parsed command
   * @param {Object} context - Execution context
   * @returns {Promise<Object>} Result
   */
  async executeBuiltinCommand(parsed, context) {
    const { command, args } = parsed;

    switch (command) {
      case "echo":
        return this.executeEcho(args);
      case "pwd":
        return this.executePwd();
      case "cd":
        return this.executeCd(args[0]);
      case "export":
        return this.executeExport(args, context);
      case "set":
        return this.executeSet(args, context);
      case "history":
        return this.executeHistory(args);
      case "help":
        return this.executeHelp(args);
      case "version":
        return this.executeVersion();
      case "exit":
      case "quit":
        return this.executeExit(args);
      default:
        throw new Error(`Unknown builtin command: ${command}`);
    }
  }

  /**
   * Execute external command
   * @param {Object} parsed - Parsed command
   * @param {Object} context - Execution context
   * @returns {Promise<Object>} Result
   */
  async executeExternalCommand(parsed, context) {
    // In a real implementation, this would spawn a child process
    // For this deobfuscated version, we'll simulate command execution

    const { command, args } = parsed;

    // Simulate some common commands
    if (command === "ls" || command === "dir") {
      return this.simulateListDirectory(args);
    } else if (command === "cat" || command === "type") {
      return this.simulateReadFile(args);
    } else if (command === "curl" || command === "wget") {
      return this.simulateHttpRequest(args);
    }

    // Default simulation
    return {
      exitCode: 0,
      stdout: `Simulated execution of: ${command} ${args.join(" ")}`,
      stderr: "",
      duration: Math.random() * 1000 + 100,
    };
  }

  /**
   * Execute echo command
   * @param {Array<string>} args - Command arguments
   * @returns {Object} Result
   */
  executeEcho(args) {
    const output = args.join(" ");
    return {
      exitCode: 0,
      stdout: output,
      stderr: "",
    };
  }

  /**
   * Execute pwd command
   * @returns {Object} Result
   */
  executePwd() {
    const cwd = process.cwd ? process.cwd() : "/";
    return {
      exitCode: 0,
      stdout: cwd,
      stderr: "",
    };
  }

  /**
   * Execute cd command
   * @param {string} path - Target path
   * @returns {Object} Result
   */
  executeCd(path) {
    if (!path) path = "~";

    try {
      const resolvedPath = pathUtils.resolve(path);
      // In a real implementation, this would change the working directory
      return {
        exitCode: 0,
        stdout: "",
        stderr: "",
        cwd: resolvedPath,
      };
    } catch (error) {
      return {
        exitCode: 1,
        stdout: "",
        stderr: `cd: ${error.message}`,
      };
    }
  }

  /**
   * Execute export command
   * @param {Array<string>} args - Command arguments
   * @param {Object} context - Execution context
   * @returns {Object} Result
   */
  executeExport(args, context) {
    if (args.length === 0) {
      // Show all exported variables
      const vars = Object.entries(context.env || {})
        .map(([key, value]) => `${key}=${value}`)
        .join("\n");

      return {
        exitCode: 0,
        stdout: vars,
        stderr: "",
      };
    }

    // Set environment variables
    for (const arg of args) {
      const [key, value] = arg.split("=", 2);
      if (key && value !== undefined) {
        context.env = context.env || {};
        context.env[key] = value;
      }
    }

    return {
      exitCode: 0,
      stdout: "",
      stderr: "",
    };
  }

  /**
   * Execute set command
   * @param {Array<string>} args - Command arguments
   * @param {Object} context - Execution context
   * @returns {Object} Result
   */
  executeSet(args, context) {
    // Similar to export but for shell variables
    return this.executeExport(args, context);
  }

  /**
   * Execute history command
   * @param {Array<string>} args - Command arguments
   * @returns {Object} Result
   */
  executeHistory(args) {
    const count = args[0] ? parseInt(args[0], 10) : this.commandHistory.length;
    const history = this.commandHistory
      .slice(-count)
      .map((entry, index) => `${index + 1}  ${entry.command}`)
      .join("\n");

    return {
      exitCode: 0,
      stdout: history,
      stderr: "",
    };
  }

  /**
   * Execute help command
   * @param {Array<string>} args - Command arguments
   * @returns {Object} Result
   */
  executeHelp(args) {
    const helpText = `
CLI Application Help

Builtin Commands:
  cd [path]        Change directory
  pwd             Print working directory
  echo [args]     Print arguments
  export [var]    Set environment variable
  set [var]       Set shell variable
  history [n]     Show command history
  help [cmd]      Show help information
  version         Show version information
  exit/quit       Exit the application

External Commands:
  Commands are executed in the system shell when not builtin.
  
Examples:
  cd /home/user
  echo "Hello World"
  export PATH=/usr/bin:$PATH
  ls -la
  curl https://example.com
    `.trim();

    return {
      exitCode: 0,
      stdout: helpText,
      stderr: "",
    };
  }

  /**
   * Execute version command
   * @returns {Object} Result
   */
  executeVersion() {
    const version = `CLI Application v1.0.0
Runtime: ${this.environment.name} ${this.environment.version}
Platform: ${this.environment.platform}
Node.js: ${process.version || "N/A"}`;

    return {
      exitCode: 0,
      stdout: version,
      stderr: "",
    };
  }

  /**
   * Execute exit command
   * @param {Array<string>} args - Command arguments
   * @returns {Object} Result
   */
  executeExit(args) {
    const exitCode = args[0] ? parseInt(args[0], 10) : 0;

    // Cleanup
    this.cleanup();

    return {
      exitCode,
      stdout: "Goodbye!",
      stderr: "",
      shouldExit: true,
    };
  }

  /**
   * Simulate directory listing
   * @param {Array<string>} args - Command arguments
   * @returns {Object} Result
   */
  simulateListDirectory(args) {
    const files = [
      "file1.txt",
      "file2.js",
      "directory1/",
      "README.md",
      ".hidden",
    ];

    return {
      exitCode: 0,
      stdout: files.join("\n"),
      stderr: "",
    };
  }

  /**
   * Simulate file reading
   * @param {Array<string>} args - Command arguments
   * @returns {Object} Result
   */
  simulateReadFile(args) {
    if (args.length === 0) {
      return {
        exitCode: 1,
        stdout: "",
        stderr: "cat: missing file operand",
      };
    }

    const filename = args[0];
    return {
      exitCode: 0,
      stdout: `Contents of ${filename}:\nThis is simulated file content.`,
      stderr: "",
    };
  }

  /**
   * Simulate HTTP request
   * @param {Array<string>} args - Command arguments
   * @returns {Promise<Object>} Result
   */
  async simulateHttpRequest(args) {
    if (args.length === 0) {
      return {
        exitCode: 1,
        stdout: "",
        stderr: "curl: missing URL",
      };
    }

    const url = args[0];

    try {
      const response = await this.httpClient.get(url);
      return {
        exitCode: 0,
        stdout: JSON.stringify(response.data, null, 2),
        stderr: "",
      };
    } catch (error) {
      return {
        exitCode: 1,
        stdout: "",
        stderr: `curl: ${error.message}`,
      };
    }
  }

  /**
   * Add command to history
   * @param {string} command - Command string
   * @param {Object} result - Execution result
   */
  addToHistory(command, result) {
    this.commandHistory.push({
      command,
      timestamp: Date.now(),
      exitCode: result.exitCode,
      duration: result.duration,
    });

    // Keep history limited
    if (this.commandHistory.length > 1000) {
      this.commandHistory = this.commandHistory.slice(-500);
    }
  }

  /**
   * Handle errors
   * @param {Error} error - Error object
   * @param {string} context - Error context
   * @param {Object} metadata - Additional metadata
   */
  handleError(error, context, metadata = {}) {
    const errorInfo = {
      message: error.message,
      stack: error.stack,
      context,
      timestamp: Date.now(),
      ...metadata,
    };

    if (this.options.debug) {
      console.error("CLI Error:", errorInfo);
    }

    // In a real implementation, this might send to a logging service
  }

  /**
   * Get application statistics
   * @returns {Object} Statistics
   */
  getStats() {
    return {
      commandsExecuted: this.commandHistory.length,
      activeCommands: this.activeCommands.size,
      uptime: Date.now() - (this.startTime || Date.now()),
      environment: this.environment,
      memoryUsage: this.getMemoryUsage(),
    };
  }

  /**
   * Get memory usage
   * @returns {Object} Memory usage info
   */
  getMemoryUsage() {
    if (typeof process !== "undefined" && process.memoryUsage) {
      return process.memoryUsage();
    }

    if (typeof performance !== "undefined" && performance.memory) {
      return {
        rss: performance.memory.usedJSHeapSize,
        heapTotal: performance.memory.totalJSHeapSize,
        heapUsed: performance.memory.usedJSHeapSize,
        external: 0,
      };
    }

    return null;
  }

  /**
   * Cleanup resources
   */
  cleanup() {
    if (this.options.debug) {
      const duration = performanceMonitor.endTiming("application-lifecycle");
      console.log(`Application ran for ${duration}ms`);
    }

    // Clear active commands
    this.activeCommands.clear();

    // Cleanup performance monitoring
    performanceMonitor.clearAllMeasurements();
  }
}

/**
 * Create and run CLI application
 * @param {Object} options - Application options
 * @returns {CLIApplication} Application instance
 */
function createCLI(options = {}) {
  return new CLIApplication(options);
}

/**
 * Main entry point when run directly
 */
function main() {
  const app = createCLI({ debug: true });

  // Example usage
  if (
    typeof process !== "undefined" &&
    process.argv &&
    process.argv.length > 2
  ) {
    const command = process.argv.slice(2).join(" ");

    app
      .executeCommand(command)
      .then((result) => {
        console.log(result.stdout);
        if (result.stderr) console.error(result.stderr);
        if (result.shouldExit) process.exit(result.exitCode);
      })
      .catch((error) => {
        console.error("Command failed:", error.message);
        process.exit(1);
      });
  } else {
    console.log(
      "CLI Application initialized. Use createCLI() to create an instance.",
    );
  }
}

module.exports = {
  CLIApplication,
  createCLI,
  main,
};

// Run main if this is the entry point
if (typeof require !== "undefined" && require.main === module) {
  main();
}