/**
 * Container Handler
 *
 * CLI commands for container management.
 */

import { logger } from '../logger.ts';
import { theme } from '../colors.ts';
import { ContainerManager } from '../containers/container-manager.ts';
import { DockerManager } from '../docker/docker-manager.ts';
import type { IContainerConfig } from '../interfaces/container.ts';
import type { ITableColumn } from '../logger.ts';
import * as helpers from '../helpers/index.ts';

/**
 * Handler for container-related CLI commands
 */
export class ContainerHandler {
  private containerManager: ContainerManager;
  private dockerManager: DockerManager;

  constructor(containerManager: ContainerManager) {
    this.containerManager = containerManager;
    this.dockerManager = new DockerManager();
  }

  /**
   * List all configured containers
   */
  public async list(): Promise<void> {
    logger.log('');
    logger.info('Containers');
    logger.log('');

    const containers = this.containerManager.getAllContainers();

    if (containers.length === 0) {
      logger.logBox(
        'No Containers',
        [
          'No containers are configured.',
          '',
          theme.dim('Add a container with:'),
          `  ${theme.command('modelgrid container add')}`,
        ],
        60,
        'warning',
      );
      return;
    }

    const rows = [];

    for (const container of containers) {
      const status = await container.getStatus();
      const config = container.getConfig();

      rows.push({
        id: config.id,
        name: config.name,
        type: this.formatContainerType(container.type),
        status: status.running
          ? theme.success('Running')
          : theme.dim('Stopped'),
        health: status.running
          ? this.formatHealth(status.health)
          : theme.dim('N/A'),
        port: config.externalPort || config.port,
        models: status.loadedModels.length,
        gpus: config.gpuIds.length > 0 ? config.gpuIds.join(',') : theme.dim('None'),
      });
    }

    const columns: ITableColumn[] = [
      { header: 'ID', key: 'id', align: 'left' },
      { header: 'Name', key: 'name', align: 'left', color: theme.highlight },
      { header: 'Type', key: 'type', align: 'left' },
      { header: 'Status', key: 'status', align: 'left' },
      { header: 'Health', key: 'health', align: 'left' },
      { header: 'Port', key: 'port', align: 'right', color: theme.info },
      { header: 'Models', key: 'models', align: 'right' },
      { header: 'GPUs', key: 'gpus', align: 'left' },
    ];

    logger.logTable(columns, rows);
    logger.log('');
  }

  /**
   * Add a new container interactively
   */
  public async add(): Promise<void> {
    const { prompt, close, select } = await helpers.createPrompt();

    try {
      logger.log('');
      logger.highlight('Add Container');
      logger.dim('Configure a new AI model container');
      logger.log('');

      // Select container type
      const typeIndex = await select('Select container type:', [
        'Ollama - Easy to use, good for local models',
        'vLLM - High performance, OpenAI compatible',
        'TGI - HuggingFace Text Generation Inference',
      ]);

      const types = ['ollama', 'vllm', 'tgi'] as const;
      const containerType = types[typeIndex];

      // Container name
      const name = await prompt('Container name: ');
      if (!name.trim()) {
        logger.error('Container name is required');
        return;
      }

      // Generate ID from name
      const id = name.toLowerCase().replace(/[^a-z0-9-]/g, '-');

      // Port
      const defaultPorts = { ollama: 11434, vllm: 8000, tgi: 8080 };
      const portStr = await prompt(`Port [${defaultPorts[containerType]}]: `);
      const port = portStr ? parseInt(portStr, 10) : defaultPorts[containerType];

      // GPU assignment
      const gpuStr = await prompt('GPU IDs (comma-separated, or "all", or empty for none): ');
      let gpuIds: string[] = [];

      if (gpuStr.trim().toLowerCase() === 'all') {
        const { GpuDetector } = await import('../hardware/gpu-detector.ts');
        const detector = new GpuDetector();
        const gpus = await detector.detectGpus();
        gpuIds = gpus.map((g) => g.id);
      } else if (gpuStr.trim()) {
        gpuIds = gpuStr.split(',').map((s) => s.trim());
      }

      // Build config
      const config: IContainerConfig = {
        id,
        type: containerType,
        name,
        image: this.getDefaultImage(containerType),
        port,
        gpuIds,
        models: [],
      };

      // Add container
      await this.containerManager.addContainer(config);

      logger.log('');
      logger.success(`Container "${name}" added successfully`);
      logger.log('');
      logger.dim('Start the container with:');
      logger.log(`  ${theme.command(`modelgrid container start ${id}`)}`);
      logger.log('');
    } finally {
      close();
    }
  }

  /**
   * Remove a container
   */
  public async remove(containerId: string): Promise<void> {
    if (!containerId) {
      logger.error('Container ID is required');
      return;
    }

    const { prompt, close } = await helpers.createPrompt();

    try {
      const confirm = await prompt(`Remove container "${containerId}"? (y/N): `);

      if (confirm.toLowerCase() !== 'y') {
        logger.log('Aborted');
        return;
      }

      const success = await this.containerManager.removeContainer(containerId);

      if (success) {
        logger.success(`Container "${containerId}" removed`);
      } else {
        logger.error(`Failed to remove container "${containerId}"`);
      }
    } finally {
      close();
    }
  }

  /**
   * Start a container
   */
  public async start(containerId?: string): Promise<void> {
    if (containerId) {
      // Start specific container
      const container = this.containerManager.getContainer(containerId);
      if (!container) {
        logger.error(`Container "${containerId}" not found`);
        return;
      }

      logger.info(`Starting container "${containerId}"...`);
      const success = await container.start();

      if (success) {
        logger.success(`Container "${containerId}" started`);
      } else {
        logger.error(`Failed to start container "${containerId}"`);
      }
    } else {
      // Start all containers
      logger.info('Starting all containers...');
      await this.containerManager.startAll();
      logger.success('All containers started');
    }
  }

  /**
   * Stop a container
   */
  public async stop(containerId?: string): Promise<void> {
    if (containerId) {
      // Stop specific container
      const container = this.containerManager.getContainer(containerId);
      if (!container) {
        logger.error(`Container "${containerId}" not found`);
        return;
      }

      logger.info(`Stopping container "${containerId}"...`);
      const success = await container.stop();

      if (success) {
        logger.success(`Container "${containerId}" stopped`);
      } else {
        logger.error(`Failed to stop container "${containerId}"`);
      }
    } else {
      // Stop all containers
      logger.info('Stopping all containers...');
      await this.containerManager.stopAll();
      logger.success('All containers stopped');
    }
  }

  /**
   * Show container logs
   */
  public async logs(containerId: string, lines: number = 100): Promise<void> {
    if (!containerId) {
      logger.error('Container ID is required');
      return;
    }

    const container = this.containerManager.getContainer(containerId);
    if (!container) {
      logger.error(`Container "${containerId}" not found`);
      return;
    }

    const logs = await container.getLogs(lines);
    console.log(logs);
  }

  /**
   * Format container type for display
   */
  private formatContainerType(type: string): string {
    switch (type) {
      case 'ollama':
        return theme.containerOllama('Ollama');
      case 'vllm':
        return theme.containerVllm('vLLM');
      case 'tgi':
        return theme.containerTgi('TGI');
      default:
        return type;
    }
  }

  /**
   * Format health status
   */
  private formatHealth(health: string): string {
    switch (health) {
      case 'healthy':
        return theme.success('Healthy');
      case 'unhealthy':
        return theme.error('Unhealthy');
      case 'starting':
        return theme.warning('Starting');
      default:
        return theme.dim(health);
    }
  }

  /**
   * Get default image for container type
   */
  private getDefaultImage(type: string): string {
    switch (type) {
      case 'ollama':
        return 'ollama/ollama:latest';
      case 'vllm':
        return 'vllm/vllm-openai:latest';
      case 'tgi':
        return 'ghcr.io/huggingface/text-generation-inference:latest';
      default:
        return '';
    }
  }
}