package org.openslx.taskmanager.tasks;

import java.util.ArrayList;
import java.util.List;

import org.openslx.taskmanager.api.SystemCommandTask;

import com.google.gson.annotations.Expose;

public class Systemctl extends SystemCommandTask
{
	/**
	 * What to do: start, stop...
	 */
	@Expose
	private String operation;

	@Expose
	String service;

	private StatusObject status = new StatusObject();

	@Override
	protected String[] initCommandLine()
	{
		boolean allowAll = false;
		boolean asRoot = true;
		// Check if operation is allowed
		switch ( operation ) {
		case "start":
		case "stop":
		case "enable":
		case "disable":
		case "restart":
		case "status":
			break;
		case "show":
		case "is-active":
			allowAll = true;
			asRoot = false;
			break;
		default:
			status.addMsg( "Unknown operation: " + operation );
			return null;
		}
		if ( !allowAll ) {
			// Check if service is allowed
   		switch ( service ) {
   		case "dmsd":
   		case "dnbd3-server":
   			break;
   		case "taskmanager":
   			if ( !operation.equals( "restart" ) ) {
   				status.addMsg( "Error: Service taskmanager can only be restarted." );
   				return null;
   			}
   			break;
   		default:
   			status.addMsg( "Unknown service: " + operation );
   			return null;
   		}
		}
		List<String> params = new ArrayList<>();
		if ( asRoot ) {
			params.add( "/usr/bin/sudo" );
			params.add( "-n" );
			params.add( "-u" );
			params.add( "root" );
		}
		params.add( "/bin/systemctl" );
		params.add( operation );
		params.add( service );
		this.timeoutSeconds = 15;
		return params.toArray( new String[ params.size() ] );
	}

	private boolean errorIfNull( String check, String message )
	{
		if ( check == null )
			status.addMsg( message );
		return check == null;
	}

	@Override
	protected boolean processEnded( int exitCode )
	{
		return exitCode == 0;
	}

	@Override
	protected void processStdOut( String line )
	{
		status.addMsg( line );
	}

	@Override
	protected void processStdErr( String line )
	{
		status.addMsg( line );
	}

	@Override
	protected boolean initTask()
	{
		this.setStatusObject( this.status );
		return !errorIfNull( operation, "No operation given" );
	}

	class StatusObject
	{
		private String messages = "";

		public void addMsg( String str )
		{
			messages = messages + "\n" + str;
		}
	}

}