/**
 * Intel Driver Management
 *
 * Handles Intel Arc GPU driver detection, installation, and oneAPI setup.
 */

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

/**
 * Intel Arc/oneAPI Driver Manager
 */
export class IntelDriver extends BaseDriver {
  public readonly vendor = 'intel' as const;
  public readonly displayName = 'Intel Arc';

  /**
   * Check if Intel GPU driver is installed
   */
  public async isInstalled(): Promise<boolean> {
    try {
      // Check for xpu-smi or intel_gpu_top
      const { stdout } = await this.execCommand(
        'xpu-smi discovery 2>/dev/null || intel_gpu_top -l 2>/dev/null || ls /dev/dri/renderD* 2>/dev/null | grep -c renderD',
        { timeout: 5000, ignoreErrors: true },
      );
      return stdout.trim().length > 0 && !stdout.includes('not found');
    } catch {
      return false;
    }
  }

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

    // Check for i915 driver (Intel integrated/Arc)
    try {
      const { stdout: driverInfo } = await this.execCommand(
        'modinfo i915 2>/dev/null | grep "^version:"',
        { timeout: 5000, ignoreErrors: true },
      );

      if (driverInfo.includes('version')) {
        status.installed = true;
        const match = driverInfo.match(/version:\s*(\S+)/i);
        if (match) {
          status.version = match[1];
        }
      }
    } catch {
      // i915 module info not available
    }

    // Check for xpu-smi (Intel Arc specific)
    try {
      const { stdout: xpuVersion } = await this.execCommand(
        'xpu-smi --version 2>/dev/null',
        { timeout: 5000, ignoreErrors: true },
      );

      if (xpuVersion.includes('xpu-smi')) {
        status.installed = true;
        const match = xpuVersion.match(/(\d+\.\d+(?:\.\d+)?)/);
        if (match) {
          status.version = match[1];
        }
      }
    } catch {
      // xpu-smi not available
    }

    // Check oneAPI toolkit
    try {
      const { stdout: oneApiVersion } = await this.execCommand(
        'ls /opt/intel/oneapi/compiler/*/env/vars.sh 2>/dev/null | head -1 | xargs dirname | xargs dirname | xargs basename',
        { timeout: 5000, ignoreErrors: true },
      );

      if (oneApiVersion.trim()) {
        status.toolkitVersion = oneApiVersion.trim();
      }
    } catch {
      // oneAPI not installed
    }

    // Check container support
    try {
      const { stdout: renderDevices } = await this.execCommand(
        'ls /dev/dri/renderD* 2>/dev/null',
        { timeout: 5000, ignoreErrors: true },
      );

      if (renderDevices.includes('renderD')) {
        status.containerSupport = true;
      } else {
        status.issues.push('Intel GPU render devices not available');
      }
    } catch {
      status.issues.push('Could not check Intel GPU device availability');
    }

    if (!status.installed) {
      status.issues.push('Intel GPU driver not detected');
    }

    return status;
  }

  /**
   * Install Intel GPU drivers and optionally oneAPI
   */
  public async install(options: IDriverInstallOptions): Promise<boolean> {
    if (!await this.isRoot()) {
      logger.error('Root privileges required to install Intel GPU 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 === 'fedora') {
        return await this.installOnFedora(options);
      } else {
        logger.error(`Unsupported distribution for Intel Arc: ${distro.id}`);
        logger.info('Please install Intel drivers manually from https://dgpu-docs.intel.com/');
        return false;
      }
    } catch (error) {
      logger.error(`Failed to install Intel drivers: ${error instanceof Error ? error.message : String(error)}`);
      return false;
    }
  }

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

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

    // Add Intel graphics repository
    await this.execCommand(
      'wget -qO - https://repositories.intel.com/graphics/intel-graphics.key | gpg --dearmor --output /usr/share/keyrings/intel-graphics.gpg',
    );

    const distro = await this.getLinuxDistro();
    const ubuntuCodename = distro.version === '22.04' ? 'jammy' : distro.version === '24.04' ? 'noble' : 'jammy';

    await this.execCommand(
      `echo "deb [arch=amd64 signed-by=/usr/share/keyrings/intel-graphics.gpg] https://repositories.intel.com/graphics/ubuntu ${ubuntuCodename} arc" > /etc/apt/sources.list.d/intel-graphics.list`,
    );

    await this.aptUpdate();

    // Install Intel GPU packages
    await this.aptInstall([
      'intel-opencl-icd',
      'intel-level-zero-gpu',
      'level-zero',
      'intel-media-va-driver-non-free',
      'libmfx1',
      'libmfxgen1',
      'libvpl2',
      'libegl-mesa0',
      'libegl1-mesa',
      'libegl1-mesa-dev',
      'libgbm1',
      'libgl1-mesa-dev',
      'libgl1-mesa-dri',
      'libglapi-mesa',
      'libgles2-mesa-dev',
      'libglx-mesa0',
      'libigdgmm12',
      'libxatracker2',
      'mesa-va-drivers',
      'mesa-vdpau-drivers',
      'mesa-vulkan-drivers',
      'va-driver-all',
    ]);

    // Install xpu-smi for monitoring
    await this.aptInstall('xpu-smi');

    // Install oneAPI toolkit if requested
    if (options.installToolkit) {
      await this.installOneApi();
    }

    // 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('Intel GPU driver installation completed');
    logger.info('Verify installation with: xpu-smi discovery');
    return true;
  }

  /**
   * Install on Fedora
   */
  private async installOnFedora(options: IDriverInstallOptions): Promise<boolean> {
    logger.info('Installing Intel GPU drivers on Fedora...');

    // Intel GPU support is included in newer Fedora kernels
    // We just need to install the user-space components

    await this.dnfInstall([
      'intel-media-driver',
      'libva-intel-driver',
      'intel-compute-runtime',
      'level-zero',
      'oneapi-level-zero',
    ]);

    // Try to install xpu-smi from Intel repo
    try {
      await this.execCommand(
        'dnf copr enable -y intel/oneapi || true',
      );
      await this.dnfInstall('xpu-smi');
    } catch {
      logger.warn('Could not install xpu-smi. Intel Arc monitoring may be limited.');
    }

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

    // Install oneAPI if requested
    if (options.installToolkit) {
      await this.installOneApi();
    }

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

    logger.success('Intel GPU driver installation completed');
    return true;
  }

  /**
   * Install Intel oneAPI toolkit
   */
  private async installOneApi(): Promise<void> {
    logger.info('Installing Intel oneAPI toolkit...');

    const distro = await this.getLinuxDistro();

    if (distro.id === 'ubuntu' || distro.id === 'debian') {
      // Add Intel oneAPI repository
      await this.execCommand(
        'wget -O- https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS.PUB | gpg --dearmor | tee /usr/share/keyrings/oneapi-archive-keyring.gpg > /dev/null',
      );

      await this.execCommand(
        'echo "deb [signed-by=/usr/share/keyrings/oneapi-archive-keyring.gpg] https://apt.repos.intel.com/oneapi all main" | tee /etc/apt/sources.list.d/oneAPI.list',
      );

      await this.aptUpdate();
      await this.aptInstall('intel-basekit');
    } else if (distro.id === 'fedora') {
      // Add Intel oneAPI repository
      await this.execCommand(
        `cat <<EOF > /etc/yum.repos.d/oneAPI.repo
[oneAPI]
name=Intel oneAPI repository
baseurl=https://yum.repos.intel.com/oneapi
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://yum.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS.PUB
EOF`,
      );

      await this.dnfInstall('intel-basekit');
    }

    logger.success('Intel oneAPI toolkit installed');
    logger.info('Source the environment with: source /opt/intel/oneapi/setvars.sh');
  }

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

    try {
      // Intel GPUs work by passing through device files
      // Verify render devices exist
      const { stdout: devices } = await this.execCommand('ls -la /dev/dri/renderD* 2>/dev/null || true');

      if (!devices.includes('renderD')) {
        logger.warn('/dev/dri/renderD* not found. Intel GPU driver may not be properly loaded.');
        return false;
      }

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

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

  /**
   * Get available driver versions
   */
  public async getAvailableVersions(): Promise<string[]> {
    // Intel Arc drivers are typically tied to kernel versions
    // Return oneAPI versions as reference
    return ['2024.0', '2023.2', '2023.1', '2023.0'];
  }
}