/**
 * AMD Driver Management
 *
 * Handles AMD ROCm driver detection, installation, and container setup.
 */

import type { IDriverStatus } from '../interfaces/gpu.ts';
import { logger } from '../logger.ts';
import { BaseDriver, type IDriverInstallOptions } from './base-driver.ts';

/**
 * AMD ROCm Driver Manager
 */
export class AmdDriver extends BaseDriver {
  public readonly vendor = 'amd' as const;
  public readonly displayName = 'AMD ROCm';

  /**
   * Check if AMD ROCm driver is installed
   */
  public async isInstalled(): Promise<boolean> {
    try {
      const { stdout } = await this.execCommand('rocm-smi --showdriverversion 2>/dev/null | head -1', {
        timeout: 5000,
        ignoreErrors: true,
      });
      return stdout.includes('Driver');
    } catch {
      return false;
    }
  }

  /**
   * Get AMD ROCm driver status
   */
  public async getStatus(): Promise<IDriverStatus> {
    const status: IDriverStatus = {
      vendor: 'amd',
      installed: false,
      containerSupport: false,
      issues: [],
    };

    // Check if rocm-smi is available
    try {
      const { stdout: driverInfo } = await this.execCommand(
        'rocm-smi --showdriverversion 2>/dev/null',
        { timeout: 5000, ignoreErrors: true },
      );

      if (driverInfo.includes('Driver')) {
        status.installed = true;
        const match = driverInfo.match(/Driver version:\s*(\S+)/i);
        if (match) {
          status.version = match[1];
        }
      }
    } catch {
      status.issues.push('ROCm driver not installed or rocm-smi not available');
      return status;
    }

    // Check ROCm toolkit version
    try {
      const { stdout: rocmVersion } = await this.execCommand(
        'cat /opt/rocm/.info/version 2>/dev/null || rocminfo 2>/dev/null | grep "ROCm" | head -1',
        { timeout: 5000, ignoreErrors: true },
      );
      const match = rocmVersion.match(/(\d+\.\d+(?:\.\d+)?)/);
      if (match) {
        status.toolkitVersion = match[1];
      }
    } catch {
      // ROCm toolkit version not available
    }

    // Check Docker ROCm support
    try {
      const { stdout: dockerInfo } = await this.execCommand(
        'docker info 2>/dev/null | grep -i "rocm\\|amd"',
        { timeout: 5000, ignoreErrors: true },
      );

      // Check if rocm/pytorch or similar images can run
      const { stdout: deviceCheck } = await this.execCommand(
        'ls /dev/kfd /dev/dri/render* 2>/dev/null',
        { timeout: 5000, ignoreErrors: true },
      );

      if (deviceCheck.includes('/dev/kfd') || dockerInfo.includes('rocm')) {
        status.containerSupport = true;
      } else {
        status.issues.push('ROCm device files not available for container access');
      }
    } catch {
      status.issues.push('Could not verify Docker ROCm support');
    }

    return status;
  }

  /**
   * Install AMD ROCm driver
   */
  public async install(options: IDriverInstallOptions): Promise<boolean> {
    if (!await this.isRoot()) {
      logger.error('Root privileges required to install AMD ROCm drivers');
      return false;
    }

    const distro = await this.getLinuxDistro();
    logger.info(`Detected Linux distribution: ${distro.id} ${distro.version}`);

    try {
      if (distro.id === 'ubuntu') {
        return await this.installOnUbuntu(options);
      } else if (distro.id === 'rhel' || distro.id === 'centos' || distro.id === 'rocky' || distro.id === 'almalinux') {
        return await this.installOnRhel(options);
      } else {
        logger.error(`Unsupported distribution: ${distro.id}`);
        logger.info('Please install ROCm drivers manually from https://rocm.docs.amd.com/');
        return false;
      }
    } catch (error) {
      logger.error(`Failed to install AMD ROCm drivers: ${error instanceof Error ? error.message : String(error)}`);
      return false;
    }
  }

  /**
   * Install on Ubuntu
   */
  private async installOnUbuntu(options: IDriverInstallOptions): Promise<boolean> {
    logger.info('Installing AMD ROCm on Ubuntu...');

    // Install prerequisites
    await this.aptUpdate();
    await this.aptInstall(['wget', 'gnupg2']);

    // Add ROCm repository
    const rocmVersion = options.toolkitVersion || '6.0';
    const ubuntuVersion = (await this.getLinuxDistro()).version.replace('.', '');

    // Download and install ROCm repository
    await this.execCommand(
      `wget -q https://repo.radeon.com/rocm/rocm.gpg.key -O - | apt-key add -`,
    );

    await this.execCommand(
      `echo "deb [arch=amd64] https://repo.radeon.com/rocm/apt/${rocmVersion} ubuntu main" > /etc/apt/sources.list.d/rocm.list`,
    );

    // Add AMDGPU repository
    await this.execCommand(
      `echo "deb [arch=amd64] https://repo.radeon.com/amdgpu/${rocmVersion}/ubuntu ${ubuntuVersion === '2204' ? 'jammy' : 'focal'} main" > /etc/apt/sources.list.d/amdgpu.list`,
    );

    await this.aptUpdate();

    // Install AMDGPU driver and ROCm
    await this.aptInstall('amdgpu-dkms');

    if (options.installToolkit) {
      await this.aptInstall('rocm-hip-sdk');
    } else {
      await this.aptInstall('rocm-smi-lib');
    }

    // Add user to video and render groups
    await this.execCommand('usermod -a -G video,render $SUDO_USER || true');

    // Install container support if requested
    if (options.installContainerSupport) {
      await this.installContainerSupport();
    }

    logger.success('AMD ROCm installation completed');
    logger.warn('A system reboot is required to load the new driver');
    logger.info('After reboot, verify with: rocm-smi');
    return true;
  }

  /**
   * Install on RHEL
   */
  private async installOnRhel(options: IDriverInstallOptions): Promise<boolean> {
    logger.info('Installing AMD ROCm on RHEL/CentOS...');

    const rocmVersion = options.toolkitVersion || '6.0';
    const distro = await this.getLinuxDistro();
    const rhelVersion = distro.version.split('.')[0];

    // Add EPEL repository
    await this.dnfInstall('epel-release');

    // Add ROCm repository
    await this.execCommand(
      `cat <<EOF > /etc/yum.repos.d/rocm.repo
[ROCm]
name=ROCm
baseurl=https://repo.radeon.com/rocm/yum/${rocmVersion}/main
enabled=1
gpgcheck=1
gpgkey=https://repo.radeon.com/rocm/rocm.gpg.key
EOF`,
    );

    // Add AMDGPU repository
    await this.execCommand(
      `cat <<EOF > /etc/yum.repos.d/amdgpu.repo
[amdgpu]
name=amdgpu
baseurl=https://repo.radeon.com/amdgpu/${rocmVersion}/rhel/${rhelVersion}/main/x86_64/
enabled=1
gpgcheck=1
gpgkey=https://repo.radeon.com/rocm/rocm.gpg.key
EOF`,
    );

    // Install AMDGPU driver
    await this.dnfInstall('amdgpu-dkms');

    if (options.installToolkit) {
      await this.dnfInstall('rocm-hip-sdk');
    } else {
      await this.dnfInstall('rocm-smi-lib');
    }

    // Add user to video and render groups
    await this.execCommand('usermod -a -G video,render $SUDO_USER || true');

    // Install container support if requested
    if (options.installContainerSupport) {
      await this.installContainerSupport();
    }

    logger.success('AMD ROCm installation completed');
    logger.warn('A system reboot is required to load the new driver');
    return true;
  }

  /**
   * Install container support for AMD GPUs
   */
  public async installContainerSupport(): Promise<boolean> {
    logger.info('Configuring Docker for AMD ROCm...');

    try {
      // AMD ROCm containers work by passing through device files
      // No special runtime needed, just need to pass --device flags

      // Verify device files exist
      const { stdout: devices } = await this.execCommand('ls -la /dev/kfd /dev/dri/render* 2>/dev/null || true');

      if (!devices.includes('/dev/kfd')) {
        logger.warn('/dev/kfd not found. ROCm driver may not be properly loaded.');
        logger.info('Try rebooting the system after driver installation.');
        return false;
      }

      // Set permissions
      await this.execCommand('chmod 666 /dev/kfd /dev/dri/render* || true');

      logger.success('AMD ROCm container support configured');
      logger.info('Use the following Docker flags for ROCm containers:');
      logger.info('  --device=/dev/kfd --device=/dev/dri --group-add video');
      return true;
    } catch (error) {
      logger.error(`Failed to configure ROCm container support: ${error instanceof Error ? error.message : String(error)}`);
      return false;
    }
  }

  /**
   * Get available ROCm versions
   */
  public async getAvailableVersions(): Promise<string[]> {
    // ROCm has a standard set of supported versions
    return ['6.0', '5.7', '5.6', '5.5', '5.4'];
  }
}