/**
 * Hooks Command Implementation for FlowX
 * Ultra-simplified version compatible with Node.js strip-only mode
 */

import * as fs from 'node:fs/promises';
import * as path from 'node:path';
import * as os from 'node:os';

// Simple interfaces without complex imports
interface SimpleCLIContext {
  args: string[];
  options: Record<string, any>;
}

interface SimpleCLICommand {
  name: string;
  description: string;
  usage: string;
  examples: string[];
  handler: (context: SimpleCLIContext) => Promise<void>;
}

// Console output helpers
function printSuccess(message: string): void {
  console.log(`✅ ${message}`);
}

function printError(message: string): void {
  console.error(`❌ ${message}`);
}

function printInfo(message: string): void {
  console.log(`ℹ️ ${message}`);
}

function printWarning(message: string): void {
  console.warn(`⚠️ ${message}`);
}

// Simple memory storage
const memoryData = new Map<string, any>();

function storeMemory(key: string, value: any): void {
  memoryData.set(key, value);
}

function retrieveMemory(key: string): any {
  return memoryData.get(key);
}

function listMemory(): { key: string; value: any }[] {
  return Array.from(memoryData.entries()).map(([key, value]) => ({ key, value }));
}

export const hooksCommand: SimpleCLICommand = {
  name: 'hooks',
  description: 'Lifecycle event management and automation hooks',
  usage: 'flowx hooks <subcommand> [options]',
  examples: [
    'flowx hooks pre-task --description "Build API" --task-id task-123',
    'flowx hooks post-task --task-id task-123 --analyze-performance',
    'flowx hooks pre-edit --file src/api.js --operation edit',
    'flowx hooks post-edit --file src/api.js --memory-key "edits/api"',
    'flowx hooks session-end --export-metrics --generate-summary'
  ],
  handler: async (context: SimpleCLIContext) => {
    const { args, options } = context;
    
    if (options.help || !args.length) {
      showHooksHelp();
      return;
    }

    const subcommand = args[0];
    const subArgs = args.slice(1);

    try {
      switch (subcommand) {
        // Pre-Operation Hooks
        case 'pre-task':
          await preTaskHook(subArgs, options);
          break;
        case 'pre-edit':
          await preEditHook(subArgs, options);
          break;
        case 'pre-command':
          await preCommandHook(subArgs, options);
          break;

        // Post-Operation Hooks
        case 'post-task':
          await postTaskHook(subArgs, options);
          break;
        case 'post-edit':
          await postEditHook(subArgs, options);
          break;
        case 'post-command':
          await postCommandHook(subArgs, options);
          break;

        // Session Hooks
        case 'session-start':
          await sessionStartHook(subArgs, options);
          break;
        case 'session-end':
          await sessionEndHook(subArgs, options);
          break;
        case 'session-restore':
          await sessionRestoreHook(subArgs, options);
          break;

        // Utility Hooks
        case 'notification':
          await notificationHook(subArgs, options);
          break;
        case 'performance':
          await performanceHook(subArgs, options);
          break;
        case 'memory-sync':
          await memorySyncHook(subArgs, options);
          break;
        case 'telemetry':
          await telemetryHook(subArgs, options);
          break;

        default:
          printError(`Unknown hooks subcommand: ${subcommand}`);
          showHooksHelp();
          process.exit(1);
      }
    } catch (error) {
      console.error(`[ERROR] Hooks command failed: ${error instanceof Error ? error.message : String(error)}`);
      printError(`Hook execution failed: ${error instanceof Error ? error.message : String(error)}`);
      process.exit(1);
    }
  }
};

function showHooksHelp(): void {
  printInfo(`
FlowX Hooks System - Lifecycle Event Management

USAGE:
  flowx hooks <subcommand> [options]

HOOK TYPES:
  Pre-Operation Hooks:
    pre-task       Execute before task starts
    pre-edit       Execute before file editing
    pre-command    Execute before command execution

  Post-Operation Hooks:
    post-task      Execute after task completion
    post-edit      Execute after file editing
    post-command   Execute after command execution

  Session Hooks:
    session-start  Execute when FlowX session begins
    session-end    Execute when FlowX session ends
    session-restore Execute when session is restored

  Utility Hooks:
    notification   Send notifications
    performance    Collect performance metrics
    memory-sync    Synchronize memory state
    telemetry      Collect telemetry data

COMMON OPTIONS:
  --help         Show command help
  --json         Output in JSON format
  --dry-run      Simulate execution without side effects
  --verbose      Enable verbose output

EXAMPLES:
  flowx hooks pre-task --description "Build API" --task-id task-123
  flowx hooks post-task --task-id task-123 --analyze-performance
  flowx hooks session-end --export-metrics --generate-summary
  flowx hooks notification --message "Task completed" --level info
  flowx hooks performance --collect-metrics --export-csv
`);
}

// Hook Implementations

async function preTaskHook(args: string[], options: Record<string, any>): Promise<void> {
  const taskId = options['task-id'] || generateId();
  const description = options.description || 'Task execution';
  const timestamp = new Date().toISOString();

  const hookData = {
    type: 'pre-task',
    taskId,
    description,
    timestamp,
    metadata: {
      args,
      options,
      environment: process.env.NODE_ENV || 'development'
    }
  };

  // Store hook execution for tracking
  storeMemory(`hook:pre-task:${taskId}`, hookData);
  
  console.log(`[INFO] Pre-task hook executed for task: ${taskId}`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Pre-task hook executed`);
    printInfo(`Task ID: ${taskId}`);
    printInfo(`Description: ${description}`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function preEditHook(args: string[], options: Record<string, any>): Promise<void> {
  const filePath = options.file || args[0] || '';
  const operation = options.operation || 'edit';
  const timestamp = new Date().toISOString();

  if (!filePath) {
    throw new Error('File path is required for pre-edit hook');
  }

  const hookData = {
    type: 'pre-edit',
    filePath,
    operation,
    timestamp,
    metadata: {
      exists: await fileExists(filePath),
      size: await getFileSize(filePath),
      args,
      options
    }
  };

  storeMemory(`hook:pre-edit:${Date.now()}`, hookData);
  
  console.log(`[INFO] Pre-edit hook executed for file: ${filePath}`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Pre-edit hook executed`);
    printInfo(`File: ${filePath}`);
    printInfo(`Operation: ${operation}`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function preCommandHook(args: string[], options: Record<string, any>): Promise<void> {
  const command = options.command || args[0] || '';
  const timestamp = new Date().toISOString();

  const hookData = {
    type: 'pre-command',
    command,
    timestamp,
    metadata: {
      workingDirectory: process.cwd(),
      args,
      options,
      environment: {
        platform: os.platform(),
        arch: os.arch(),
        nodeVersion: process.version
      }
    }
  };

  storeMemory(`hook:pre-command:${Date.now()}`, hookData);
  
  console.log(`[INFO] Pre-command hook executed for command: ${command}`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Pre-command hook executed`);
    printInfo(`Command: ${command}`);
    printInfo(`Working Directory: ${process.cwd()}`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function postTaskHook(args: string[], options: Record<string, any>): Promise<void> {
  const taskId = options['task-id'] || generateId();
  const success = options.success !== 'false';
  const duration = options.duration ? parseInt(options.duration) : null;
  const timestamp = new Date().toISOString();

  // Retrieve pre-task data if available
  const preTaskData = retrieveMemory(`hook:pre-task:${taskId}`);

  const hookData = {
    type: 'post-task',
    taskId,
    success,
    duration,
    timestamp,
    preTaskData,
    metadata: {
      performance: options['analyze-performance'] === 'true',
      args,
      options
    }
  };

  storeMemory(`hook:post-task:${taskId}`, hookData);
  
  console.log(`[INFO] Post-task hook executed for task: ${taskId} (${success ? 'success' : 'failed'})`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Post-task hook executed`);
    printInfo(`Task ID: ${taskId}`);
    printInfo(`Status: ${success ? 'Success' : 'Failed'}`);
    if (duration) printInfo(`Duration: ${duration}ms`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function postEditHook(args: string[], options: Record<string, any>): Promise<void> {
  const filePath = options.file || args[0] || '';
  const success = options.success !== 'false';
  const changes = options.changes ? parseInt(options.changes) : null;
  const timestamp = new Date().toISOString();

  if (!filePath) {
    throw new Error('File path is required for post-edit hook');
  }

  const hookData = {
    type: 'post-edit',
    filePath,
    success,
    changes,
    timestamp,
    metadata: {
      finalSize: await getFileSize(filePath),
      memoryKey: options['memory-key'],
      args,
      options
    }
  };

  // Store in memory if memory-key is provided
  if (options['memory-key']) {
    storeMemory(options['memory-key'], hookData);
  }

  storeMemory(`hook:post-edit:${Date.now()}`, hookData);
  
  console.log(`[INFO] Post-edit hook executed for file: ${filePath} (${success ? 'success' : 'failed'})`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Post-edit hook executed`);
    printInfo(`File: ${filePath}`);
    printInfo(`Status: ${success ? 'Success' : 'Failed'}`);
    if (changes) printInfo(`Changes: ${changes}`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function postCommandHook(args: string[], options: Record<string, any>): Promise<void> {
  const command = options.command || args[0] || '';
  const exitCode = options['exit-code'] ? parseInt(options['exit-code']) : 0;
  const duration = options.duration ? parseInt(options.duration) : null;
  const timestamp = new Date().toISOString();

  const hookData = {
    type: 'post-command',
    command,
    exitCode,
    duration,
    timestamp,
    metadata: {
      success: exitCode === 0,
      args,
      options
    }
  };

  storeMemory(`hook:post-command:${Date.now()}`, hookData);
  
  console.log(`[INFO] Post-command hook executed for command: ${command} (exit code: ${exitCode})`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Post-command hook executed`);
    printInfo(`Command: ${command}`);
    printInfo(`Exit Code: ${exitCode}`);
    if (duration) printInfo(`Duration: ${duration}ms`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function sessionStartHook(args: string[], options: Record<string, any>): Promise<void> {
  const sessionId = options['session-id'] || generateId();
  const timestamp = new Date().toISOString();

  const hookData = {
    type: 'session-start',
    sessionId,
    timestamp,
    metadata: {
      platform: os.platform(),
      arch: os.arch(),
      nodeVersion: process.version,
      workingDirectory: process.cwd(),
      args,
      options
    }
  };

  storeMemory(`session:${sessionId}`, hookData);
  storeMemory('session:current', sessionId);
  
  console.log(`[INFO] Session started: ${sessionId}`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Session started`);
    printInfo(`Session ID: ${sessionId}`);
    printInfo(`Platform: ${os.platform()} ${os.arch()}`);
    printInfo(`Node Version: ${process.version}`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function sessionEndHook(args: string[], options: Record<string, any>): Promise<void> {
  const sessionId = options['session-id'] || retrieveMemory('session:current') || generateId();
  const timestamp = new Date().toISOString();

  // Collect session metrics
  const sessionData = retrieveMemory(`session:${sessionId}`);
  const startTime = sessionData?.timestamp ? new Date(sessionData.timestamp) : new Date();
  const duration = Date.now() - startTime.getTime();

  const hookData = {
    type: 'session-end',
    sessionId,
    timestamp,
    duration,
    metadata: {
      exportMetrics: options['export-metrics'] === 'true',
      generateSummary: options['generate-summary'] === 'true',
      sessionData,
      args,
      options
    }
  };

  storeMemory(`hook:session-end:${sessionId}`, hookData);
  
  console.log(`[INFO] Session ended: ${sessionId} (duration: ${duration}ms)`);

  // Export metrics if requested
  if (options['export-metrics']) {
    await exportSessionMetrics(sessionId, hookData);
  }

  // Generate summary if requested
  if (options['generate-summary']) {
    generateSessionSummary(sessionId, hookData);
  }

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Session ended`);
    printInfo(`Session ID: ${sessionId}`);
    printInfo(`Duration: ${Math.round(duration / 1000)}s`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function sessionRestoreHook(args: string[], options: Record<string, any>): Promise<void> {
  const sessionId = options['session-id'] || args[0] || '';
  const timestamp = new Date().toISOString();

  if (!sessionId) {
    throw new Error('Session ID is required for session restore');
  }

  const sessionData = retrieveMemory(`session:${sessionId}`);

  const hookData = {
    type: 'session-restore',
    sessionId,
    timestamp,
    restored: !!sessionData,
    metadata: {
      sessionData,
      args,
      options
    }
  };

  storeMemory(`hook:session-restore:${sessionId}`, hookData);
  storeMemory('session:current', sessionId);
  
  console.log(`[INFO] Session restore attempted: ${sessionId} (${sessionData ? 'found' : 'not found'})`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    if (sessionData) {
      printSuccess(`Session restored`);
      printInfo(`Session ID: ${sessionId}`);
      printInfo(`Original start: ${sessionData.timestamp}`);
    } else {
      printWarning(`Session not found: ${sessionId}`);
    }
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function notificationHook(args: string[], options: Record<string, any>): Promise<void> {
  const message = options.message || args.join(' ') || 'FlowX notification';
  const level = options.level || 'info';
  const title = options.title || 'FlowX';
  const timestamp = new Date().toISOString();

  const hookData = {
    type: 'notification',
    message,
    level,
    title,
    timestamp,
    metadata: {
      args,
      options
    }
  };

  storeMemory(`hook:notification:${Date.now()}`, hookData);
  
  console.log(`[INFO] Notification sent: ${message}`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Notification sent`);
    printInfo(`Title: ${title}`);
    printInfo(`Message: ${message}`);
    printInfo(`Level: ${level}`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function performanceHook(args: string[], options: Record<string, any>): Promise<void> {
  const timestamp = new Date().toISOString();
  const memoryUsage = process.memoryUsage();
  const cpuUsage = process.cpuUsage();

  const hookData = {
    type: 'performance',
    timestamp,
    metrics: {
      memory: {
        rss: memoryUsage.rss,
        heapTotal: memoryUsage.heapTotal,
        heapUsed: memoryUsage.heapUsed,
        external: memoryUsage.external
      },
      cpu: {
        user: cpuUsage.user,
        system: cpuUsage.system
      },
      uptime: process.uptime(),
      platform: os.platform(),
      arch: os.arch(),
      loadAverage: os.loadavg()
    },
    metadata: {
      collectMetrics: options['collect-metrics'] === 'true',
      exportCsv: options['export-csv'] === 'true',
      args,
      options
    }
  };

  storeMemory(`hook:performance:${Date.now()}`, hookData);
  
  console.log(`[INFO] Performance metrics collected`);

  // Export to CSV if requested
  if (options['export-csv']) {
    await exportPerformanceMetrics(hookData);
  }

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Performance metrics collected`);
    printInfo(`Memory RSS: ${Math.round(memoryUsage.rss / 1024 / 1024)}MB`);
    printInfo(`Heap Used: ${Math.round(memoryUsage.heapUsed / 1024 / 1024)}MB`);
    printInfo(`Uptime: ${Math.round(process.uptime())}s`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function memorySyncHook(args: string[], options: Record<string, any>): Promise<void> {
  const timestamp = new Date().toISOString();
  const memoryKeys = listMemory();

  const hookData = {
    type: 'memory-sync',
    timestamp,
    memoryState: {
      entryCount: memoryKeys.length,
      keys: memoryKeys.map(entry => entry.key),
      totalSize: JSON.stringify(memoryKeys).length
    },
    metadata: {
      args,
      options
    }
  };

  storeMemory(`hook:memory-sync:${Date.now()}`, hookData);
  
  console.log(`[INFO] Memory sync completed: ${memoryKeys.length} entries`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Memory synchronization completed`);
    printInfo(`Total entries: ${memoryKeys.length}`);
    printInfo(`Total size: ${Math.round(JSON.stringify(memoryKeys).length / 1024)}KB`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

async function telemetryHook(args: string[], options: Record<string, any>): Promise<void> {
  const timestamp = new Date().toISOString();
  const memoryEntries = listMemory();
  
  // Collect telemetry data
  const telemetryData = {
    hooks: memoryEntries.filter(entry => entry.key.startsWith('hook:')),
    sessions: memoryEntries.filter(entry => entry.key.startsWith('session:')),
    performance: memoryEntries.filter(entry => entry.key.includes('performance')),
    errors: memoryEntries.filter(entry => entry.value.type === 'error')
  };

  const hookData = {
    type: 'telemetry',
    timestamp,
    telemetry: {
      totalHooks: telemetryData.hooks.length,
      totalSessions: telemetryData.sessions.length,
      performanceMetrics: telemetryData.performance.length,
      errors: telemetryData.errors.length
    },
    metadata: {
      args,
      options
    }
  };

  storeMemory(`hook:telemetry:${Date.now()}`, hookData);
  
  console.log(`[INFO] Telemetry collected: ${telemetryData.hooks.length} hooks, ${telemetryData.sessions.length} sessions`);

  if (options.json) {
    console.log(JSON.stringify(hookData));
  } else {
    printSuccess(`Telemetry data collected`);
    printInfo(`Total hooks: ${telemetryData.hooks.length}`);
    printInfo(`Total sessions: ${telemetryData.sessions.length}`);
    printInfo(`Performance entries: ${telemetryData.performance.length}`);
    printInfo(`Errors: ${telemetryData.errors.length}`);
    printInfo(`Timestamp: ${timestamp}`);
  }
}

// Utility Functions

function generateId(): string {
  return `${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
}

async function fileExists(filePath: string): Promise<boolean> {
  try {
    await fs.access(filePath);
    return true;
  } catch {
    return false;
  }
}

async function getFileSize(filePath: string): Promise<number> {
  try {
    const stats = await fs.stat(filePath);
    return stats.size;
  } catch {
    return 0;
  }
}

async function exportSessionMetrics(sessionId: string, hookData: any): Promise<void> {
  const filename = `session-metrics-${sessionId}-${Date.now()}.json`;
  const filePath = path.join(process.cwd(), filename);
  
  await fs.writeFile(filePath, JSON.stringify(hookData, null, 2));
  printInfo(`Session metrics exported to: ${filename}`);
}

function generateSessionSummary(sessionId: string, hookData: any): void {
  printInfo(`\nSession Summary (${sessionId}):`);
  printInfo(`Duration: ${Math.round(hookData.duration / 1000)}s`);
  printInfo(`Start Time: ${hookData.metadata.sessionData?.timestamp || 'Unknown'}`);
  printInfo(`End Time: ${hookData.timestamp}`);
}

async function exportPerformanceMetrics(hookData: any): Promise<void> {
  const filename = `performance-metrics-${Date.now()}.csv`;
  const filePath = path.join(process.cwd(), filename);
  
  const csvHeader = 'timestamp,rss,heapTotal,heapUsed,external,userCPU,systemCPU,uptime\n';
  const csvRow = `${hookData.timestamp},${hookData.metrics.memory.rss},${hookData.metrics.memory.heapTotal},${hookData.metrics.memory.heapUsed},${hookData.metrics.memory.external},${hookData.metrics.cpu.user},${hookData.metrics.cpu.system},${hookData.metrics.uptime}\n`;
  
  await fs.writeFile(filePath, csvHeader + csvRow);
  printInfo(`Performance metrics exported to: ${filename}`);
}