/**
 * Configuration Manager
 * Handles configuration storage and retrieval
 */

import * as plugins from '../plugins.ts';

export interface IMailerConfig {
  domains: IDomainConfig[];
  apiKeys: string[];
  smtpPort: number;
  apiPort: number;
  hostname: string;
}

export interface IDomainConfig {
  domain: string;
  dnsMode: 'forward' | 'internal-dns' | 'external-dns';
  cloudflare?: {
    apiToken: string;
  };
}

export class ConfigManager {
  private configPath: string;
  private config: IMailerConfig | null = null;

  constructor(configPath?: string) {
    this.configPath = configPath || plugins.path.join(Deno.env.get('HOME') || '/root', '.mailer', 'config.json');
  }

  /**
   * Load configuration from disk
   */
  async load(): Promise<IMailerConfig> {
    try {
      const data = await Deno.readTextFile(this.configPath);
      this.config = JSON.parse(data);
      return this.config!;
    } catch (error) {
      // Return default config if file doesn't exist
      this.config = this.getDefaultConfig();
      return this.config;
    }
  }

  /**
   * Save configuration to disk
   */
  async save(config: IMailerConfig): Promise<void> {
    this.config = config;

    // Ensure directory exists
    const dir = plugins.path.dirname(this.configPath);
    await Deno.mkdir(dir, { recursive: true });

    // Write config
    await Deno.writeTextFile(this.configPath, JSON.stringify(config, null, 2));
  }

  /**
   * Get current configuration
   */
  getConfig(): IMailerConfig {
    if (!this.config) {
      throw new Error('Configuration not loaded. Call load() first.');
    }
    return this.config;
  }

  /**
   * Get default configuration
   */
  private getDefaultConfig(): IMailerConfig {
    return {
      domains: [],
      apiKeys: [],
      smtpPort: 25,
      apiPort: 8080,
      hostname: 'localhost',
    };
  }
}