/**
 * System Information
 *
 * Gathers CPU, RAM, disk, network, and GPU information
 */

import { runCommand } from '../utils/command.ts';

export interface CpuInfo {
  model: string;
  cores: number;
  usage: number;
}

export interface MemoryInfo {
  total: number;
  used: number;
  free: number;
  usagePercent: number;
}

export interface DiskInfo {
  device: string;
  mountpoint: string;
  total: number;
  used: number;
  free: number;
  usagePercent: number;
}

export interface NetworkInterface {
  name: string;
  ip: string;
  mac: string;
  state: 'up' | 'down';
}

export interface GpuInfo {
  name: string;
  driver: string;
}

export interface SystemInfoData {
  hostname: string;
  cpu: CpuInfo;
  memory: MemoryInfo;
  disks: DiskInfo[];
  network: NetworkInterface[];
  gpu: GpuInfo[];
  uptime: number;
}

export class SystemInfo {
  async getInfo(): Promise<SystemInfoData> {
    const [hostname, cpu, memory, disks, network, gpu, uptime] =
      await Promise.all([
        this.getHostname(),
        this.getCpuInfo(),
        this.getMemoryInfo(),
        this.getDiskInfo(),
        this.getNetworkInfo(),
        this.getGpuInfo(),
        this.getUptime(),
      ]);

    return { hostname, cpu, memory, disks, network, gpu, uptime };
  }

  private async getHostname(): Promise<string> {
    try {
      const result = await runCommand('hostname', []);
      if (!result.success) return 'unknown';
      return result.stdout.trim();
    } catch {
      return 'unknown';
    }
  }

  private async getCpuInfo(): Promise<CpuInfo> {
    try {
      const cpuinfo = await Deno.readTextFile('/proc/cpuinfo');
      const modelMatch = cpuinfo.match(/model name\s*:\s*(.+)/);
      const coreMatches = cpuinfo.match(/processor\s*:/g);

      // Get CPU usage from /proc/stat
      const stat = await Deno.readTextFile('/proc/stat');
      const cpuLine = stat.split('\n')[0];
      const values = cpuLine.split(/\s+/).slice(1).map(Number);
      const total = values.reduce((a, b) => a + b, 0);
      const idle = values[3];
      const usage = ((total - idle) / total) * 100;

      return {
        model: modelMatch ? modelMatch[1] : 'Unknown',
        cores: coreMatches ? coreMatches.length : 1,
        usage: Math.round(usage * 10) / 10,
      };
    } catch {
      return { model: 'Unknown', cores: 1, usage: 0 };
    }
  }

  private async getMemoryInfo(): Promise<MemoryInfo> {
    try {
      const meminfo = await Deno.readTextFile('/proc/meminfo');
      const totalMatch = meminfo.match(/MemTotal:\s*(\d+)/);
      const freeMatch = meminfo.match(/MemAvailable:\s*(\d+)/);

      const total = totalMatch ? parseInt(totalMatch[1], 10) * 1024 : 0;
      const free = freeMatch ? parseInt(freeMatch[1], 10) * 1024 : 0;
      const used = total - free;

      return {
        total,
        used,
        free,
        usagePercent: total > 0 ? Math.round((used / total) * 1000) / 10 : 0,
      };
    } catch {
      return { total: 0, used: 0, free: 0, usagePercent: 0 };
    }
  }

  private async getDiskInfo(): Promise<DiskInfo[]> {
    try {
      const result = await runCommand('df', ['-B1', '--output=source,target,size,used,avail']);
      if (!result.success) return [];
      const lines = result.stdout.trim().split('\n').slice(1);
      const disks: DiskInfo[] = [];

      for (const line of lines) {
        const parts = line.trim().split(/\s+/);
        if (parts.length >= 5 && parts[0].startsWith('/dev/')) {
          const total = parseInt(parts[2], 10);
          const used = parseInt(parts[3], 10);
          const free = parseInt(parts[4], 10);

          disks.push({
            device: parts[0],
            mountpoint: parts[1],
            total,
            used,
            free,
            usagePercent: total > 0 ? Math.round((used / total) * 1000) / 10 : 0,
          });
        }
      }

      return disks;
    } catch {
      return [];
    }
  }

  private async getNetworkInfo(): Promise<NetworkInterface[]> {
    try {
      const cmdResult = await runCommand('ip', ['-j', 'addr']);
      if (!cmdResult.success) return [];
      const interfaces = JSON.parse(cmdResult.stdout);
      const result: NetworkInterface[] = [];

      for (const iface of interfaces) {
        if (iface.ifname === 'lo') continue;

        let ip = '';
        let mac = iface.address || '';

        for (const addr of iface.addr_info || []) {
          if (addr.family === 'inet') {
            ip = addr.local;
            break;
          }
        }

        result.push({
          name: iface.ifname,
          ip: ip || 'No IP',
          mac,
          state: iface.operstate === 'UP' ? 'up' : 'down',
        });
      }

      return result;
    } catch {
      return [];
    }
  }

  private async getGpuInfo(): Promise<GpuInfo[]> {
    try {
      const result = await runCommand('lspci', ['-mm']);
      if (!result.success) return [];
      const lines = result.stdout.split('\n');
      const gpus: GpuInfo[] = [];

      for (const line of lines) {
        if (line.includes('VGA') || line.includes('3D') || line.includes('Display')) {
          const parts = line.split('"');
          if (parts.length >= 6) {
            gpus.push({
              name: parts[5] || 'Unknown GPU',
              driver: 'unknown',
            });
          }
        }
      }

      return gpus;
    } catch {
      return [];
    }
  }

  private async getUptime(): Promise<number> {
    try {
      const uptime = await Deno.readTextFile('/proc/uptime');
      return Math.floor(parseFloat(uptime.split(' ')[0]));
    } catch {
      return 0;
    }
  }
}