/**
 * GPU Handler
 *
 * CLI commands for GPU management.
 */

import { logger } from '../logger.ts';
import { theme } from '../colors.ts';
import { GpuDetector } from '../hardware/gpu-detector.ts';
import { SystemInfo } from '../hardware/system-info.ts';
import { DriverManager } from '../drivers/driver-manager.ts';
import type { ITableColumn } from '../logger.ts';

/**
 * Handler for GPU-related CLI commands
 */
export class GpuHandler {
  private gpuDetector: GpuDetector;
  private systemInfo: SystemInfo;
  private driverManager: DriverManager;

  constructor() {
    this.gpuDetector = new GpuDetector();
    this.systemInfo = new SystemInfo();
    this.driverManager = new DriverManager();
  }

  /**
   * List detected GPUs
   */
  public async list(): Promise<void> {
    logger.log('');
    logger.info('Detecting GPUs...');
    logger.log('');

    const gpus = await this.gpuDetector.detectGpus();

    if (gpus.length === 0) {
      logger.logBox(
        'No GPUs Detected',
        [
          'No GPUs were found on this system.',
          '',
          theme.dim('Possible reasons:'),
          '  - No discrete GPU installed',
          '  - GPU drivers not installed',
          '  - GPU not properly connected',
        ],
        60,
        'warning',
      );
      return;
    }

    const rows = gpus.map((gpu) => ({
      id: gpu.id,
      vendor: this.formatVendor(gpu.vendor),
      model: gpu.model,
      vram: `${Math.round(gpu.vram / 1024)} GB`,
      driver: gpu.driverVersion || theme.dim('N/A'),
      cuda: gpu.cudaVersion || theme.dim('N/A'),
      pci: gpu.pciSlot,
    }));

    const columns: ITableColumn[] = [
      { header: 'ID', key: 'id', align: 'left' },
      { header: 'Vendor', key: 'vendor', align: 'left' },
      { header: 'Model', key: 'model', align: 'left', color: theme.highlight },
      { header: 'VRAM', key: 'vram', align: 'right', color: theme.info },
      { header: 'Driver', key: 'driver', align: 'left' },
      { header: 'CUDA', key: 'cuda', align: 'left' },
      { header: 'PCI', key: 'pci', align: 'left', color: theme.dim },
    ];

    logger.info(`Found ${gpus.length} GPU(s):`);
    logger.log('');
    logger.logTable(columns, rows);
    logger.log('');
  }

  /**
   * Show GPU status and utilization
   */
  public async status(): Promise<void> {
    logger.log('');
    logger.info('GPU Status');
    logger.log('');

    const gpuStatus = await this.gpuDetector.getGpuStatus();

    if (gpuStatus.length === 0) {
      logger.warn('No GPUs detected');
      return;
    }

    for (const gpu of gpuStatus) {
      const utilizationBar = this.createProgressBar(gpu.utilization, 30);
      const memoryBar = this.createProgressBar(gpu.memoryUsed / gpu.memoryTotal * 100, 30);

      logger.logBoxTitle(`GPU ${gpu.id}: ${gpu.name}`, 70, 'info');
      logger.logBoxLine(`Utilization: ${utilizationBar} ${gpu.utilization.toFixed(1)}%`);
      logger.logBoxLine(`Memory:      ${memoryBar} ${Math.round(gpu.memoryUsed)}/${Math.round(gpu.memoryTotal)} MB`);
      logger.logBoxLine(`Temperature: ${this.formatTemperature(gpu.temperature)}`);
      logger.logBoxLine(`Power:       ${gpu.powerDraw.toFixed(0)}W / ${gpu.powerLimit.toFixed(0)}W`);
      logger.logBoxEnd();
      logger.log('');
    }
  }

  /**
   * Check and install GPU drivers
   */
  public async drivers(): Promise<void> {
    logger.log('');
    logger.info('GPU Driver Status');
    logger.log('');

    // Get system info first
    const sysInfo = await this.systemInfo.getSystemInfo();

    // Detect GPUs
    const gpus = await this.gpuDetector.detectGpus();

    if (gpus.length === 0) {
      logger.warn('No GPUs detected');
      return;
    }

    // Check driver status for each vendor
    const vendors = new Set(gpus.map((g) => g.vendor));

    for (const vendor of vendors) {
      const driver = this.driverManager.getDriver(vendor);
      if (!driver) {
        logger.warn(`No driver support for ${vendor}`);
        continue;
      }

      const status = await driver.getStatus();

      logger.logBoxTitle(`${this.formatVendor(vendor)} Driver`, 60, status.installed ? 'success' : 'warning');
      logger.logBoxLine(`Installed: ${status.installed ? theme.success('Yes') : theme.error('No')}`);

      if (status.installed) {
        logger.logBoxLine(`Version: ${status.version || 'Unknown'}`);
        logger.logBoxLine(`Runtime: ${status.runtimeVersion || 'Unknown'}`);
        logger.logBoxLine(`Container Support: ${status.containerSupport ? theme.success('Yes') : theme.warning('No')}`);
      } else {
        logger.logBoxLine('');
        logger.logBoxLine(theme.dim('Run `modelgrid gpu install` to install drivers'));
      }

      logger.logBoxEnd();
      logger.log('');
    }
  }

  /**
   * Install GPU drivers
   */
  public async install(): Promise<void> {
    logger.log('');
    logger.info('Installing GPU Drivers');
    logger.log('');

    // Detect GPUs
    const gpus = await this.gpuDetector.detectGpus();

    if (gpus.length === 0) {
      logger.error('No GPUs detected - cannot install drivers');
      return;
    }

    // Install drivers for each vendor
    const vendors = new Set(gpus.map((g) => g.vendor));

    for (const vendor of vendors) {
      const driver = this.driverManager.getDriver(vendor);
      if (!driver) {
        logger.warn(`No driver installer for ${vendor}`);
        continue;
      }

      logger.info(`Installing ${this.formatVendor(vendor)} drivers...`);

      const success = await driver.install();

      if (success) {
        logger.success(`${this.formatVendor(vendor)} drivers installed successfully`);

        // Setup container support
        logger.info('Setting up container support...');
        const containerSuccess = await driver.setupContainer();

        if (containerSuccess) {
          logger.success('Container support configured');
        } else {
          logger.warn('Container support setup failed - GPU passthrough may not work');
        }
      } else {
        logger.error(`Failed to install ${this.formatVendor(vendor)} drivers`);
      }

      logger.log('');
    }
  }

  /**
   * Format vendor name for display
   */
  private formatVendor(vendor: string): string {
    switch (vendor) {
      case 'nvidia':
        return theme.gpuNvidia('NVIDIA');
      case 'amd':
        return theme.gpuAmd('AMD');
      case 'intel':
        return theme.gpuIntel('Intel');
      default:
        return vendor;
    }
  }

  /**
   * Create a progress bar
   */
  private createProgressBar(percent: number, width: number): string {
    const filled = Math.round((percent / 100) * width);
    const empty = width - filled;
    const bar = '█'.repeat(filled) + '░'.repeat(empty);

    if (percent >= 90) {
      return theme.error(bar);
    } else if (percent >= 70) {
      return theme.warning(bar);
    } else {
      return theme.success(bar);
    }
  }

  /**
   * Format temperature with color coding
   */
  private formatTemperature(temp: number): string {
    const tempStr = `${temp}°C`;

    if (temp >= 85) {
      return theme.error(tempStr);
    } else if (temp >= 70) {
      return theme.warning(tempStr);
    } else {
      return theme.success(tempStr);
    }
  }
}