/**
 * Config Handler
 *
 * CLI commands for configuration management.
 */

import { logger } from '../logger.ts';
import { theme } from '../colors.ts';
import { PATHS } from '../constants.ts';
import type { IModelGridConfig } from '../interfaces/config.ts';
import type { ITableColumn } from '../logger.ts';
import * as fs from 'node:fs/promises';

/**
 * Handler for configuration-related CLI commands
 */
export class ConfigHandler {
  /**
   * Show current configuration
   */
  public async show(): Promise<void> {
    logger.log('');

    try {
      const configPath = PATHS.CONFIG_FILE;
      const configContent = await fs.readFile(configPath, 'utf-8');
      const config = JSON.parse(configContent) as IModelGridConfig;

      // Overview
      logger.logBox(
        'ModelGrid Configuration',
        [
          `Version: ${theme.highlight(config.version)}`,
          `Check Interval: ${theme.info(String(config.checkInterval / 1000))} seconds`,
          '',
          theme.dim('Configuration File:'),
          `  ${theme.path(configPath)}`,
        ],
        60,
        'info',
      );

      // API Configuration
      logger.log('');
      logger.logBox(
        'API Server',
        [
          `Host: ${theme.info(config.api.host)}`,
          `Port: ${theme.highlight(String(config.api.port))}`,
          `API Keys: ${config.api.apiKeys.length} configured`,
          ...(config.api.rateLimit
            ? [`Rate Limit: ${config.api.rateLimit} req/min`]
            : []),
          '',
          theme.dim('Endpoint:'),
          `  http://${config.api.host}:${config.api.port}/v1/chat/completions`,
        ],
        60,
        'info',
      );

      // Docker Configuration
      logger.log('');
      logger.logBox(
        'Docker',
        [
          `Runtime: ${theme.info(config.docker.runtime)}`,
          `Network: ${config.docker.networkName}`,
        ],
        60,
        'default',
      );

      // GPU Configuration
      logger.log('');
      logger.logBox(
        'GPU',
        [
          `Auto Detect: ${config.gpus.autoDetect ? theme.success('Yes') : theme.dim('No')}`,
          `Assignments: ${Object.keys(config.gpus.assignments).length} GPU(s)`,
        ],
        60,
        'default',
      );

      // Model Configuration
      logger.log('');
      logger.logBox(
        'Models',
        [
          `Auto Pull: ${config.models.autoPull ? theme.success('Enabled') : theme.dim('Disabled')}`,
          `Default Container: ${config.models.defaultContainer}`,
          `Auto Load: ${config.models.autoLoad.length} model(s)`,
          '',
          theme.dim('Greenlist URL:'),
          `  ${config.models.greenlistUrl}`,
        ],
        70,
        'default',
      );

      // Containers
      if (config.containers.length > 0) {
        logger.log('');
        logger.info(`Containers (${config.containers.length}):`);
        logger.log('');

        const rows = config.containers.map((c) => ({
          id: c.id,
          name: c.name,
          type: c.type,
          image: c.image.length > 40 ? c.image.substring(0, 37) + '...' : c.image,
          port: c.port,
          gpus: c.gpuIds.length > 0 ? c.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: 'Image', key: 'image', align: 'left', color: theme.dim },
          { header: 'Port', key: 'port', align: 'right' },
          { header: 'GPUs', key: 'gpus', align: 'left' },
        ];

        logger.logTable(columns, rows);
      }

      logger.log('');
    } catch (error) {
      if ((error as NodeJS.ErrnoException).code === 'ENOENT') {
        logger.logBox(
          'No Configuration',
          [
            'No configuration file found.',
            '',
            theme.dim('Create configuration with:'),
            `  ${theme.command('modelgrid service enable')}`,
            '',
            theme.dim('Or manually create:'),
            `  ${PATHS.CONFIG_FILE}`,
          ],
          60,
          'warning',
        );
      } else {
        logger.error(`Failed to read configuration: ${(error as Error).message}`);
      }
    }
  }

  /**
   * Initialize default configuration
   */
  public async init(): Promise<void> {
    const configPath = PATHS.CONFIG_FILE;

    // Check if config already exists
    try {
      await fs.access(configPath);
      logger.warn('Configuration file already exists');
      logger.dim(`  ${configPath}`);
      return;
    } catch {
      // File doesn't exist, continue
    }

    // Create config directory
    const configDir = PATHS.CONFIG_DIR;
    await fs.mkdir(configDir, { recursive: true });

    // Create default config
    const defaultConfig: IModelGridConfig = {
      version: '1.0.0',
      api: {
        port: 8080,
        host: '0.0.0.0',
        apiKeys: [],
        cors: true,
        corsOrigins: ['*'],
      },
      docker: {
        networkName: 'modelgrid',
        runtime: 'docker',
      },
      gpus: {
        autoDetect: true,
        assignments: {},
      },
      containers: [],
      models: {
        greenlistUrl: 'https://code.foss.global/modelgrid.com/model_lists/raw/branch/main/greenlit.json',
        autoPull: true,
        defaultContainer: 'ollama',
        autoLoad: [],
      },
      checkInterval: 30000,
    };

    await fs.writeFile(configPath, JSON.stringify(defaultConfig, null, 2));

    logger.success('Configuration initialized');
    logger.dim(`  ${configPath}`);
  }

  /**
   * Add an API key
   */
  public async addApiKey(key?: string): Promise<void> {
    const configPath = PATHS.CONFIG_FILE;

    try {
      const configContent = await fs.readFile(configPath, 'utf-8');
      const config = JSON.parse(configContent) as IModelGridConfig;

      // Generate key if not provided
      const apiKey = key || this.generateApiKey();

      if (config.api.apiKeys.includes(apiKey)) {
        logger.warn('API key already exists');
        return;
      }

      config.api.apiKeys.push(apiKey);

      await fs.writeFile(configPath, JSON.stringify(config, null, 2));

      logger.success('API key added:');
      logger.log(`  ${theme.highlight(apiKey)}`);
      logger.log('');
      logger.dim('Use with Authorization header:');
      logger.dim(`  curl -H "Authorization: Bearer ${apiKey}" ...`);
    } catch (error) {
      logger.error(`Failed to add API key: ${(error as Error).message}`);
    }
  }

  /**
   * Remove an API key
   */
  public async removeApiKey(key: string): Promise<void> {
    if (!key) {
      logger.error('API key is required');
      return;
    }

    const configPath = PATHS.CONFIG_FILE;

    try {
      const configContent = await fs.readFile(configPath, 'utf-8');
      const config = JSON.parse(configContent) as IModelGridConfig;

      const index = config.api.apiKeys.indexOf(key);
      if (index === -1) {
        logger.warn('API key not found');
        return;
      }

      config.api.apiKeys.splice(index, 1);

      await fs.writeFile(configPath, JSON.stringify(config, null, 2));

      logger.success('API key removed');
    } catch (error) {
      logger.error(`Failed to remove API key: ${(error as Error).message}`);
    }
  }

  /**
   * List API keys
   */
  public async listApiKeys(): Promise<void> {
    const configPath = PATHS.CONFIG_FILE;

    try {
      const configContent = await fs.readFile(configPath, 'utf-8');
      const config = JSON.parse(configContent) as IModelGridConfig;

      if (config.api.apiKeys.length === 0) {
        logger.warn('No API keys configured');
        logger.dim('Add a key with: modelgrid config apikey add');
        return;
      }

      logger.info(`API Keys (${config.api.apiKeys.length}):`);
      logger.log('');

      for (const key of config.api.apiKeys) {
        // Show partial key for security
        const masked = key.substring(0, 8) + '...' + key.substring(key.length - 4);
        logger.log(`  ${masked}`);
      }

      logger.log('');
    } catch (error) {
      logger.error(`Failed to list API keys: ${(error as Error).message}`);
    }
  }

  /**
   * Generate a random API key
   */
  private generateApiKey(): string {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    const length = 48;
    let key = 'sk-';

    for (let i = 0; i < length; i++) {
      key += chars.charAt(Math.floor(Math.random() * chars.length));
    }

    return key;
  }
}