/**
 * Driver Manager
 *
 * Coordinates detection and installation of GPU drivers across all vendors.
 */

import type { IDriverStatus, TGpuVendor } from '../interfaces/gpu.ts';
import { logger } from '../logger.ts';
import { GpuDetector } from '../hardware/gpu-detector.ts';
import { BaseDriver, type IDriverInstallOptions } from './base-driver.ts';
import { NvidiaDriver } from './nvidia.ts';
import { AmdDriver } from './amd.ts';
import { IntelDriver } from './intel.ts';

/**
 * Driver Manager - coordinates GPU driver management
 */
export class DriverManager {
  private gpuDetector: GpuDetector;
  private drivers: Map<TGpuVendor, BaseDriver>;

  constructor() {
    this.gpuDetector = new GpuDetector();
    this.drivers = new Map([
      ['nvidia', new NvidiaDriver()],
      ['amd', new AmdDriver()],
      ['intel', new IntelDriver()],
    ]);
  }

  /**
   * Get driver manager for a specific vendor
   */
  public getDriver(vendor: TGpuVendor): BaseDriver | undefined {
    return this.drivers.get(vendor);
  }

  /**
   * Get status of all GPU drivers
   */
  public async getAllDriverStatus(): Promise<Map<TGpuVendor, IDriverStatus>> {
    const statuses = new Map<TGpuVendor, IDriverStatus>();

    // Only check drivers for detected GPUs
    const gpus = await this.gpuDetector.detectGpus();
    const detectedVendors = new Set(gpus.map((g) => g.vendor));

    for (const vendor of detectedVendors) {
      if (vendor === 'unknown') continue;

      const driver = this.drivers.get(vendor);
      if (driver) {
        const status = await driver.getStatus();
        statuses.set(vendor, status);
      }
    }

    return statuses;
  }

  /**
   * Check drivers for all detected GPUs
   */
  public async checkAllDrivers(): Promise<{
    allInstalled: boolean;
    allContainerReady: boolean;
    issues: string[];
  }> {
    const gpus = await this.gpuDetector.detectGpus();
    const issues: string[] = [];
    let allInstalled = true;
    let allContainerReady = true;

    if (gpus.length === 0) {
      issues.push('No GPUs detected');
      return { allInstalled: false, allContainerReady: false, issues };
    }

    // Group GPUs by vendor
    const vendorCounts = new Map<TGpuVendor, number>();
    for (const gpu of gpus) {
      vendorCounts.set(gpu.vendor, (vendorCounts.get(gpu.vendor) || 0) + 1);
    }

    // Check each vendor
    for (const [vendor, count] of vendorCounts) {
      if (vendor === 'unknown') {
        issues.push(`${count} GPU(s) with unknown vendor - cannot manage drivers`);
        continue;
      }

      const driver = this.drivers.get(vendor);
      if (!driver) {
        issues.push(`No driver manager for ${vendor}`);
        continue;
      }

      const status = await driver.getStatus();

      if (!status.installed) {
        allInstalled = false;
        issues.push(`${driver.displayName} driver not installed for ${count} GPU(s)`);
      }

      if (!status.containerSupport) {
        allContainerReady = false;
        issues.push(`${driver.displayName} container support not configured`);
      }

      // Add specific issues
      issues.push(...status.issues);
    }

    return { allInstalled, allContainerReady, issues };
  }

  /**
   * Install drivers for all detected GPUs
   */
  public async installAllDrivers(options: Partial<IDriverInstallOptions> = {}): Promise<boolean> {
    const fullOptions: IDriverInstallOptions = {
      installToolkit: options.installToolkit ?? true,
      installContainerSupport: options.installContainerSupport ?? true,
      nonInteractive: options.nonInteractive ?? false,
      driverVersion: options.driverVersion,
      toolkitVersion: options.toolkitVersion,
    };

    const gpus = await this.gpuDetector.detectGpus();
    const vendors = new Set(gpus.map((g) => g.vendor).filter((v) => v !== 'unknown'));

    if (vendors.size === 0) {
      logger.error('No supported GPUs detected');
      return false;
    }

    let allSuccess = true;

    for (const vendor of vendors) {
      const driver = this.drivers.get(vendor);
      if (!driver) continue;

      logger.info(`Installing ${driver.displayName} drivers...`);

      const success = await driver.install(fullOptions);
      if (!success) {
        allSuccess = false;
        logger.error(`Failed to install ${driver.displayName} drivers`);
      }
    }

    return allSuccess;
  }

  /**
   * Install container support for all GPUs
   */
  public async installContainerSupport(): Promise<boolean> {
    const gpus = await this.gpuDetector.detectGpus();
    const vendors = new Set(gpus.map((g) => g.vendor).filter((v) => v !== 'unknown'));

    let allSuccess = true;

    for (const vendor of vendors) {
      const driver = this.drivers.get(vendor);
      if (!driver) continue;

      const success = await driver.installContainerSupport();
      if (!success) {
        allSuccess = false;
      }
    }

    return allSuccess;
  }

  /**
   * Print driver status summary
   */
  public async printDriverStatus(): Promise<void> {
    const gpus = await this.gpuDetector.detectGpus();

    if (gpus.length === 0) {
      logger.logBox('Driver Status', ['No GPUs detected'], 50, 'warning');
      return;
    }

    // Group by vendor
    const vendorGpus = new Map<TGpuVendor, typeof gpus>();
    for (const gpu of gpus) {
      if (!vendorGpus.has(gpu.vendor)) {
        vendorGpus.set(gpu.vendor, []);
      }
      vendorGpus.get(gpu.vendor)!.push(gpu);
    }

    // Print status for each vendor
    for (const [vendor, gpuList] of vendorGpus) {
      if (vendor === 'unknown') {
        logger.logBox('Unknown GPUs', [
          `${gpuList.length} GPU(s) with unknown vendor`,
          'Manual driver installation may be required',
        ], 50, 'warning');
        continue;
      }

      const driver = this.drivers.get(vendor);
      if (driver) {
        await driver.logStatus();
      }
    }
  }

  /**
   * Get Docker run arguments for GPU support
   */
  public async getDockerGpuArgs(gpuIds?: string[]): Promise<string[]> {
    const gpus = await this.gpuDetector.detectGpus();
    const args: string[] = [];

    // Filter to specific GPUs if provided
    const targetGpus = gpuIds
      ? gpus.filter((g) => gpuIds.includes(g.id))
      : gpus;

    if (targetGpus.length === 0) {
      return args;
    }

    // Determine vendor (assume single vendor for simplicity)
    const vendor = targetGpus[0].vendor;

    switch (vendor) {
      case 'nvidia':
        // NVIDIA uses nvidia-docker runtime
        args.push('--runtime=nvidia');
        if (gpuIds && gpuIds.length > 0) {
          // Use specific GPU indices
          const indices = targetGpus.map((g) => g.index).join(',');
          args.push(`--gpus="device=${indices}"`);
        } else {
          args.push('--gpus=all');
        }
        break;

      case 'amd':
        // AMD uses device passthrough
        args.push('--device=/dev/kfd');
        for (const gpu of targetGpus) {
          args.push(`--device=/dev/dri/renderD${128 + gpu.index}`);
        }
        args.push('--group-add=video');
        args.push('--security-opt=seccomp=unconfined');
        break;

      case 'intel':
        // Intel uses device passthrough
        for (const gpu of targetGpus) {
          args.push(`--device=/dev/dri/renderD${128 + gpu.index}`);
        }
        args.push('--group-add=render');
        break;
    }

    return args;
  }
}