import { OSUtils } from 'node-os-utils';

const osutils = new OSUtils();

// Get CPU usage
const cpuUsage = await osutils.cpu.usage();
if (cpuUsage.success) {
  console.log('CPU Usage:', cpuUsage.data + '%');
}

// Get memory information
const memInfo = await osutils.memory.info();
if (memInfo.success) {
  console.log('Memory:', memInfo.data);
}

// Get system overview
const overview = await osutils.overview();
console.log('System Overview:', overview);

import { OSUtils } from 'node-os-utils';

const osutils = new OSUtils({
  // Cache settings
  cacheEnabled: true,
  cacheTTL: 5000,
  maxCacheSize: 1000,

  // Execution settings
  timeout: 10000,

  // Debug mode
  debug: false,

  // Monitor-specific configurations
  cpu: { cacheTTL: 30000 },
  memory: { cacheTTL: 5000 },
  disk: { cacheTTL: 60000 }
});

// Configure individual monitors
const cpuMonitor = osutils.cpu
  .withCaching(true, 30000)
  .withConfig({ timeout: 5000 });

// Configure cache at runtime
osutils.configureCache({
  enabled: true,
  maxSize: 2000,
  defaultTTL: 10000
});

type MonitorResult<T> =
  | {
      success: true;
      data: T;
      timestamp: number;
      cached: boolean;
      platform: string;
    }
  | {
      success: false;
      error: MonitorError;
      platform: string;
      timestamp: number;
    };

const result = await osutils.cpu.info();

if (result.success) {
  // Success: use result.data
  console.log('CPU Model:', result.data.model);
  console.log('Cores:', result.data.cores);
} else {
  // Error: handle gracefully
  console.error('Error:', result.error?.message);
  console.error('Code:', result.error?.code);

  // Platform-specific handling
  if (result.error?.code === ErrorCode.PLATFORM_NOT_SUPPORTED) {
    console.log('This feature is not available on', result.platform);
  }
}

enum ErrorCode {
  PLATFORM_NOT_SUPPORTED = 'PLATFORM_NOT_SUPPORTED', // Feature unavailable on current platform
  COMMAND_FAILED = 'COMMAND_FAILED',               // Shell/command execution failed
  PARSE_ERROR = 'PARSE_ERROR',                     // Failed to parse command output or data
  PERMISSION_DENIED = 'PERMISSION_DENIED',         // Lacking required privileges
  TIMEOUT = 'TIMEOUT',                             // Operation exceeded the configured timeout
  INVALID_CONFIG = 'INVALID_CONFIG',               // Provided configuration is invalid
  NOT_AVAILABLE = 'NOT_AVAILABLE',                 // Metric temporarily unavailable
  FILE_NOT_FOUND = 'FILE_NOT_FOUND',               // Required file or path missing
  NETWORK_ERROR = 'NETWORK_ERROR'                  // Network operation failed
}

// Basic CPU information
const cpuInfo = await osutils.cpu.info();
if (cpuInfo.success) {
  console.log('Model:', cpuInfo.data.model);
  console.log('Cores:', cpuInfo.data.cores);
  console.log('Architecture:', cpuInfo.data.architecture);
}

// CPU usage monitoring
const cpuUsage = await osutils.cpu.usage();
if (cpuUsage.success) {
  console.log('CPU Usage:', cpuUsage.data + '%');
}

// Detailed usage (overall + per core)
const usageDetails = await osutils.cpu.usageDetailed();
if (usageDetails.success) {
  console.log('Overall:', usageDetails.data.overall);
  console.log('Per core:', usageDetails.data.cores);
}

// Load average (Linux/macOS)
const loadAvg = await osutils.cpu.loadAverage();
if (loadAvg.success) {
  console.log('Load Average:', loadAvg.data);
}

// Poll usage every second with manual interval control
const pollInterval = setInterval(async () => {
  const result = await osutils.cpu.usage();
  if (result.success) {
    console.log(`CPU Usage: ${result.data.toFixed(2)}%`);
    if (result.data > 80) {
      console.warn('⚠️ High CPU usage detected!');
    }
  }
}, 1000);

setTimeout(() => {
  clearInterval(pollInterval);
  console.log('CPU usage polling stopped');
}, 30000);

// Fetch CPU info periodically using the built-in monitor helper
const cpuInfoSubscription = osutils.cpu.withCaching(false).monitor(5000, (info) => {
  console.log('CPU Model:', info.model);
});

setTimeout(() => cpuInfoSubscription.unsubscribe(), 20000);

// Memory information with DataSize helpers
const memInfo = await osutils.memory.info();
if (memInfo.success) {
  console.log('Total Memory:', memInfo.data.total.toGB().toFixed(2) + ' GB');
  console.log('Available:', memInfo.data.available.toGB().toFixed(2) + ' GB');
  console.log('Used:', memInfo.data.used.toGB().toFixed(2) + ' GB');
  console.log('Usage:', memInfo.data.usagePercentage.toFixed(2) + '%');
}

// Quick memory usage percentage
const memUsage = await osutils.memory.usage();
if (memUsage.success) {
  console.log('Memory Usage:', memUsage.data.toFixed(2) + '%');
}

// Summary view with formatted strings
const memSummary = await osutils.memory.summary();
if (memSummary.success) {
  console.log('Summary:', memSummary.data);
}

class DataSize {
  constructor(bytes: number);
  toBytes(): number;
  toKB(): number;
  toMB(): number;
  toGB(): number;
  toTB(): number;
  toString(unit?: 'auto' | 'B' | 'KB' | 'MB' | 'GB' | 'TB'): string;
}

// Usage example
const memory = await osutils.memory.info();
if (memory.success) {
  console.log(memory.data.total.toString('GB')); // "16.00 GB"
  console.log(memory.data.available.toString()); // automatic unit selection
}

// All disk information
const diskInfo = await osutils.disk.info();
if (diskInfo.success) {
  diskInfo.data.forEach(disk => {
    console.log('Filesystem:', disk.filesystem);
    console.log('Mount Point:', disk.mountpoint);
    console.log('Total:', disk.total.toString('GB'));
    console.log('Available:', disk.available.toString('GB'));
    console.log('Usage:', disk.usagePercentage + '%');
  });
}

// Specific mount usage
const rootUsage = await osutils.disk.usageByMountPoint('/');
if (rootUsage.success && rootUsage.data) {
  console.log('Root usage:', rootUsage.data.usagePercentage + '%');
}

// I/O statistics
const ioStats = await osutils.disk.stats();
if (ioStats.success) {
  ioStats.data.forEach(stat => {
    console.log(`${stat.device}:`, {
      readBytes: stat.readBytes.toString('MB'),
      writeBytes: stat.writeBytes.toString('MB'),
      readCount: stat.readCount,
      writeCount: stat.writeCount
    });
  });
}

// Network interfaces
const interfaces = await osutils.network.interfaces();
if (interfaces.success) {
  interfaces.data.forEach(iface => {
    console.log('Interface:', iface.name);
    console.log('Addresses:', iface.addresses);
    console.log('State:', iface.state);
  });
}

// Network overview
const overview = await osutils.network.overview();
if (overview.success) {
  console.log('Total RX:', overview.data.totalRxBytes.toString('MB'));
  console.log('Total TX:', overview.data.totalTxBytes.toString('MB'));
}

// Per-interface statistics
const stats = await osutils.network.statsAsync();
if (stats.success) {
  stats.data.forEach(stat => {
    console.log(`${stat.interface}: RX ${stat.rxBytes.toString('MB')} | TX ${stat.txBytes.toString('MB')}`);
  });
}

// Real-time interface monitoring (returns NetworkInterface[] snapshots)
const netSub = osutils.network.monitor(5000, (interfacesSnapshot) => {
  console.log('Active interfaces:', interfacesSnapshot.filter(iface => iface.state === 'up').map(iface => iface.name));
});

// List all processes
const processes = await osutils.process.list();
if (processes.success) {
  console.log('Total processes:', processes.data.length);

  // Show top 5 CPU consumers
  const topCpu = processes.data
    .filter(proc => proc.cpuUsage > 0)
    .sort((a, b) => b.cpuUsage - a.cpuUsage)
    .slice(0, 5);

  topCpu.forEach(proc => {
    console.log(`${proc.name} (${proc.pid}): ${proc.cpuUsage.toFixed(2)}% CPU`);
  });
}

// Find specific processes
const nodeProcesses = await osutils.process.byName('node');
if (nodeProcesses.success) {
  console.log('Node.js processes:', nodeProcesses.data.length);
}

// Current process info
const currentProc = await osutils.process.byPid(process.pid);
if (currentProc.success && currentProc.data) {
  console.log('Current process memory:', currentProc.data.memoryUsage.toString('MB'));
}

// System information
const sysInfo = await osutils.system.info();
if (sysInfo.success) {
  console.log('Hostname:', sysInfo.data.hostname);
  console.log('Platform:', sysInfo.data.platform);
  console.log('Distro:', sysInfo.data.distro);
  console.log('Release:', sysInfo.data.release);
  console.log('Architecture:', sysInfo.data.arch);
}

// System uptime
const uptime = await osutils.system.uptime();
if (uptime.success) {
  console.log('Uptime (ms):', uptime.data.uptime);
  console.log('Boot time:', new Date(uptime.data.bootTime).toISOString());
  console.log('Friendly uptime:', uptime.data.uptimeFormatted);
}

// Active users
const users = await osutils.system.users();
if (users.success) {
  console.log('Logged users:', users.data.map(u => u.username));
}

import { OSUtils } from 'node-os-utils';

const osutils = new OSUtils({ debug: true });

// Comprehensive system overview
const overview = await osutils.overview();
console.log('📊 System Overview:');
if (overview.cpu.usage != null) {
  console.log('CPU Usage:', overview.cpu.usage + '%');
}
if (overview.memory?.usagePercentage != null) {
  console.log('Memory Usage:', overview.memory.usagePercentage + '%');
}
if (overview.disk?.usagePercentage != null) {
  console.log('Disk Usage:', overview.disk.usagePercentage + '%');
}
if (overview.network) {
  console.log('Network RX:', overview.network.totalRxBytes.toString('MB'));
  console.log('Network TX:', overview.network.totalTxBytes.toString('MB'));
}
if (overview.processes) {
  console.log('Processes:', overview.processes.total);
}
if (overview.system?.uptime != null) {
  console.log('Uptime:', (overview.system.uptime / 3600).toFixed(1) + ' hours');
}

// System health check
const health = await osutils.healthCheck();
console.log('🏥 System Health:', health.status); // 'healthy' | 'warning' | 'critical'

if (health.issues.length > 0) {
  console.log('⚠️ Issues detected:');
  health.issues.forEach(issue => console.log(`- ${issue}`));
}

// Create monitoring dashboard
class SystemDashboard {
  private intervals: NodeJS.Timeout[] = [];
  private alerts: string[] = [];

  start() {
    console.log('🚀 Starting system monitoring dashboard...');

    // CPU usage polling
    this.intervals.push(setInterval(async () => {
      const result = await osutils.cpu.usage();
      if (result.success) {
        const value = result.data.toFixed(2);
        this.updateDisplay('CPU', `${value}%`);
        if (result.data > 80) {
          this.addAlert(`⚠️ High CPU usage: ${value}%`);
        }
      }
    }, 1000));

    // Memory usage polling
    this.intervals.push(setInterval(async () => {
      const result = await osutils.memory.info();
      if (result.success) {
        const percent = result.data.usagePercentage;
        this.updateDisplay('Memory', `${percent.toFixed(2)}%`);
        if (percent > 85) {
          this.addAlert(`⚠️ High memory usage: ${percent.toFixed(2)}%`);
        }
      }
    }, 2000));

    // Disk usage polling
    this.intervals.push(setInterval(async () => {
      const result = await osutils.disk.usageByMountPoint('/');
      if (result.success && result.data) {
        this.updateDisplay('Disk', `${result.data.usagePercentage.toFixed(1)}%`);
        if (result.data.usagePercentage > 90) {
          this.addAlert(`⚠️ Disk almost full: ${result.data.usagePercentage.toFixed(1)}%`);
        }
      }
    }, 10000));

    // Network statistics polling
    this.intervals.push(setInterval(async () => {
      const stats = await osutils.network.statsAsync();
      if (stats.success) {
        const aggregate = stats.data.reduce(
          (acc, item) => ({
            rx: acc.rx + item.rxBytes.toBytes(),
            tx: acc.tx + item.txBytes.toBytes()
          }),
          { rx: 0, tx: 0 }
        );

        this.updateDisplay(
          'Network',
          `↓${(aggregate.rx / 1024 / 1024).toFixed(2)} MB ↑${(aggregate.tx / 1024 / 1024).toFixed(2)} MB`
        );
      }
    }, 5000));

    // Alert checker
    this.intervals.push(setInterval(() => {
      if (this.alerts.length > 0) {
        console.log('🚨 Active Alerts:');
        this.alerts.forEach(alert => console.log(alert));
        this.alerts = [];
      }
    }, 10000));
  }

  private updateDisplay(metric: string, value: string) {
    // Update your UI here
    console.log(`📊 ${metric}: ${value}`);
  }

  private addAlert(alert: string) {
    this.alerts.push(alert);
  }

  stop() {
    this.intervals.forEach(interval => clearInterval(interval));
    this.intervals = [];
    console.log('⏹️ Monitoring stopped');
  }
}

// Usage
const dashboard = new SystemDashboard();
dashboard.start();

// Stop after 5 minutes
setTimeout(() => dashboard.stop(), 5 * 60 * 1000);

// Performance-optimized configuration
const osutils = new OSUtils({
  // Global cache settings
  cacheEnabled: true,
  cacheTTL: 5000,
  maxCacheSize: 1000,

  // Execution settings
  timeout: 15000,

  // Debug mode
  debug: false,

  // Monitor-specific settings
  cpu: {
    cacheTTL: 1000,    // Fast refresh for CPU
    interval: 100      // High precision monitoring
  },
  memory: {
    cacheTTL: 5000     // Moderate refresh for memory
  },
  disk: {
    cacheTTL: 30000,   // Slow refresh for disk
    timeout: 10000
  },
  network: {
    cacheTTL: 2000,    // Medium refresh for network
    includeInterfaceStats: true
  },
  process: {
    cacheTTL: 10000    // Slow refresh for processes
  }
});

// Runtime cache configuration
osutils.configureCache({
  enabled: true,
  maxSize: 2000,
  defaultTTL: 8000
});

// Cache statistics
const cacheStats = osutils.getCacheStats();
if (cacheStats) {
  console.log('Cache hit rate:', cacheStats.hitRate.toFixed(1) + '%');
  console.log('Cache entries:', cacheStats.size);
  console.log('Estimated memory used:', (cacheStats.memoryUsage / (1024 * 1024)).toFixed(2) + ' MB');
}

// Clear cache when needed
osutils.clearCache();

import { ErrorCode, MonitorError } from 'node-os-utils';

// Comprehensive error handling
class SystemMonitoringService {
  private osutils: OSUtils;

  constructor() {
    this.osutils = new OSUtils({ debug: true });
  }

  async getSystemInfo() {
    try {
      const results = await Promise.allSettled([
        this.osutils.cpu.info(),
        this.osutils.memory.info(),
        this.osutils.disk.info(),
        this.osutils.network.interfaces(),
        this.osutils.system.info()
      ]);

      const data: Record<string, unknown> = {};
      const errors: Array<{ component: string; error: MonitorError | Error; timestamp: Date }> = [];

      results.forEach((result, index) => {
        const keys = ['cpu', 'memory', 'disk', 'network', 'system'];
        const key = keys[index];

        if (result.status === 'fulfilled' && result.value.success) {
          data[key] = result.value.data;
        } else {
          const monitorError = result.status === 'fulfilled'
            ? result.value.error
            : (result.reason instanceof MonitorError
              ? result.reason
              : MonitorError.createCommandFailed(process.platform, 'unknown', { reason: result.reason }));

          errors.push({
            component: key,
            error: monitorError,
            timestamp: new Date()
          });

          // Handle specific error types
          this.handleComponentError(key, monitorError);
        }
      });

      return { data, errors };
    } catch (error) {
      console.error('System monitoring failed:', error);
      throw error;
    }
  }

  private handleComponentError(component: string, error: any) {
    switch (error?.code) {
      case ErrorCode.PLATFORM_NOT_SUPPORTED:
        console.warn(`${component} monitoring not supported on ${process.platform}`);
        break;
      case ErrorCode.PERMISSION_DENIED:
        console.error(`Insufficient permissions for ${component} monitoring`);
        break;
      case ErrorCode.TIMEOUT:
        console.warn(`${component} monitoring timed out, retrying...`);
        break;
      case ErrorCode.COMMAND_FAILED:
        console.error(`${component} system command failed:`, error.message);
        break;
      default:
        console.error(`Unknown ${component} error:`, error?.message);
    }
  }

  // Graceful degradation example
  async getCPUUsageWithFallback(): Promise<number> {
    const result = await this.osutils.cpu.usage();

    if (result.success) {
      return result.data;
    }

    // Fallback to OS module
    const os = require('os');
    const cpus = os.cpus();

    // Simple calculation as fallback
    return Math.random() * 20 + 10; // Mock fallback
  }
}

// v1.x
const osu = require('node-os-utils');
const cpuUsage = await osu.cpu.usage();

// v2.0
import { OSUtils } from 'node-os-utils';
const osutils = new OSUtils();
const cpuResult = await osutils.cpu.usage();
if (cpuResult.success) {
  const cpuUsage = cpuResult.data;
}

// v1.x - Direct values
const cpuUsage = await osu.cpu.usage(); // number
const memInfo = await osu.mem.info();   // object

// v2.0 - MonitorResult wrapper
const cpuResult = await osutils.cpu.usage();
if (cpuResult.success) {
  const cpuUsage = cpuResult.data; // number
}

const memResult = await osutils.memory.info();
if (memResult.success) {
  const memInfo = memResult.data; // MemoryInfo
}

// v1.x code
const osu = require('node-os-utils');

async function getSystemInfo() {
  const cpuUsage = await osu.cpu.usage();
  const memInfo = await osu.mem.info();
  const driveInfo = await osu.drive.info();

  return {
    cpu: cpuUsage,
    memory: memInfo,
    disk: driveInfo
  };
}

// v2.0 equivalent
import { OSUtils } from 'node-os-utils';

const osutils = new OSUtils();

async function getSystemInfo() {
  const [cpuResult, memResult, diskResult] = await Promise.all([
    osutils.cpu.usage(),
    osutils.memory.info(),
    osutils.disk.info()
  ]);

  return {
    cpu: cpuResult.success ? cpuResult.data : null,
    memory: memResult.success ? memResult.data : null,
    disk: diskResult.success ? diskResult.data : null
  };
}

// Enable caching for better performance
const osutils = new OSUtils({
  cacheEnabled: true,
  cacheTTL: 5000  // 5 second cache
});

// Use appropriate cache TTL for different metrics
const config = {
  cpu: { cacheTTL: 1000 },     // Fast changing
  memory: { cacheTTL: 3000 },   // Medium changing
  disk: { cacheTTL: 30000 },    // Slow changing
};