import { SmartDaemon } from './smartdaemon.classes.smartdaemon.js';
import { SmartDaemonService } from './smartdaemon.classes.service.js';

export class SmartDaemonTemplateManager {
  public smartdaemonRef: SmartDaemon;

  constructor(smartdaemonRefArg: SmartDaemon) {
    this.smartdaemonRef = smartdaemonRefArg;
  }

  private generateEnvironmentLines(serviceArg: SmartDaemonService): string {
    const environment = serviceArg.environment || {};
    return Object.entries(environment)
      .map(([key, value]) => {
        if (!/^[A-Za-z_][A-Za-z0-9_]*$/.test(key)) {
          throw new Error(`Invalid systemd environment key: ${key}`);
        }
        const escapedValue = value.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
        return `Environment="${key}=${escapedValue}"`;
      })
      .join('\n');
  }

  public generateUnitFileForService = (serviceArg: SmartDaemonService) => {
    const environmentLines = this.generateEnvironmentLines(serviceArg);
    return `# ---
# name: ${serviceArg.name}
# version: ${serviceArg.version}
# description: ${serviceArg.description}
# command: ${serviceArg.command}
# workingDir: ${serviceArg.workingDir}${serviceArg.user ? `
# user: ${serviceArg.user}` : ''}${serviceArg.group ? `
# group: ${serviceArg.group}` : ''}
# ---
[Unit]
Description=${serviceArg.description}
Requires=network.target
After=network.target

[Service]
Type=simple${serviceArg.user ? `
User=${serviceArg.user}` : ''}${serviceArg.group ? `
Group=${serviceArg.group}` : ''}${environmentLines ? `
${environmentLines}` : ''}
ExecStart=/bin/bash -c "cd ${serviceArg.workingDir} && ${serviceArg.command}"
WorkingDirectory=${serviceArg.workingDir}
Restart=on-failure
LimitNOFILE=infinity
LimitCORE=infinity
StandardInput=null
StandardOutput=syslog
StandardError=syslog
Restart=always
[Install]
WantedBy=multi-user.target
`;
  };
}