/**
 * Cloud-Init Generator
 * Generates cloud-init configuration files
 */

import { yaml, path as pathUtil } from '../plugins.ts';
import { log } from '../logging.ts';
import type { ICloudInitConfig } from '../interfaces/iso-config.interface.ts';

export interface INetworkConfig {
  wifi?: {
    ssid: string;
    password: string;
  };
}

export class CloudInitGenerator {
  /**
   * Generate user-data file content
   */
  generateUserData(config: ICloudInitConfig): string {
    const userDataObj: Record<string, unknown> = {
      '#cloud-config': null,
    };

    // Hostname
    if (config.hostname) {
      userDataObj.hostname = config.hostname;
    }

    // Users
    if (config.users && config.users.length > 0) {
      userDataObj.users = config.users.map((user) => ({
        name: user.name,
        ...(user.ssh_authorized_keys && { ssh_authorized_keys: user.ssh_authorized_keys }),
        ...(user.sudo && { sudo: user.sudo }),
        ...(user.shell && { shell: user.shell }),
        ...(user.groups && { groups: user.groups }),
        ...(user.lock_passwd !== undefined && { lock_passwd: user.lock_passwd }),
        ...(user.passwd && { passwd: user.passwd }),
      }));
    }

    // Packages
    if (config.packages && config.packages.length > 0) {
      userDataObj.packages = config.packages;
    }

    // Package update/upgrade
    if (config.package_update !== undefined) {
      userDataObj.package_update = config.package_update;
    }
    if (config.package_upgrade !== undefined) {
      userDataObj.package_upgrade = config.package_upgrade;
    }

    // Run commands
    if (config.runcmd && config.runcmd.length > 0) {
      userDataObj.runcmd = config.runcmd;
    }

    // Write files
    if (config.write_files && config.write_files.length > 0) {
      userDataObj.write_files = config.write_files;
    }

    // Timezone
    if (config.timezone) {
      userDataObj.timezone = config.timezone;
    }

    // Locale
    if (config.locale) {
      userDataObj.locale = config.locale;
    }

    // SSH settings
    if (config.ssh) {
      userDataObj.ssh = config.ssh;
    }

    // Add any additional custom directives
    for (const [key, value] of Object.entries(config)) {
      if (!['hostname', 'users', 'packages', 'package_update', 'package_upgrade',
            'runcmd', 'write_files', 'timezone', 'locale', 'ssh'].includes(key)) {
        userDataObj[key] = value;
      }
    }

    // Remove the cloud-config comment from the object before YAML conversion
    delete userDataObj['#cloud-config'];

    // Convert to YAML and add the cloud-config header
    const yamlContent = yaml.stringify(userDataObj);
    return `#cloud-config\n${yamlContent}`;
  }

  /**
   * Generate network-config file content (for WiFi)
   */
  generateNetworkConfig(networkConfig: INetworkConfig): string {
    if (!networkConfig.wifi) {
      return yaml.stringify({ version: 2 });
    }

    const { ssid, password } = networkConfig.wifi;

    const netConfig = {
      version: 2,
      wifis: {
        wlan0: {
          dhcp4: true,
          optional: true,
          'access-points': {
            [ssid]: {
              password: password,
            },
          },
        },
      },
    };

    return yaml.stringify(netConfig);
  }

  /**
   * Generate meta-data file content
   */
  generateMetaData(hostname?: string): string {
    const metaData = {
      'instance-id': `iid-${Date.now()}`,
      'local-hostname': hostname || 'ubuntu',
    };

    return yaml.stringify(metaData);
  }

  /**
   * Write cloud-init files to a directory
   */
  async writeCloudInitFiles(
    outputDir: string,
    cloudInitConfig: ICloudInitConfig,
    networkConfig?: INetworkConfig,
  ): Promise<void> {
    log.info('Generating cloud-init configuration files...');

    // Generate user-data
    const userData = this.generateUserData(cloudInitConfig);
    const userDataPath = pathUtil.join(outputDir, 'user-data');
    await Deno.writeTextFile(userDataPath, userData);
    log.success('Generated user-data');

    // Generate network-config
    if (networkConfig) {
      const netConfig = this.generateNetworkConfig(networkConfig);
      const netConfigPath = pathUtil.join(outputDir, 'network-config');
      await Deno.writeTextFile(netConfigPath, netConfig);
      log.success('Generated network-config');
    }

    // Generate meta-data
    const metaData = this.generateMetaData(cloudInitConfig.hostname);
    const metaDataPath = pathUtil.join(outputDir, 'meta-data');
    await Deno.writeTextFile(metaDataPath, metaData);
    log.success('Generated meta-data');
  }
}