package com.datentechnik.moa.id.conf;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

import javax.xml.bind.JAXBException;

import com.datentechnik.moa.id.conf.cli.MOAIDConfCLI;
import com.datentechnik.moa.id.conf.cli.MigrateConfigurationParams;

/**
 * CLI tool which is able to perform the following tasks:
 * <ul>
 * <li>transform a MoaID 2 XML configuration XML file to a MoaID 3 property file
 * </li>
 * <li>read a property file and transfer it's content to a database</li>
 * <li>write the content of a database to a property file</li>
 * </ul>
 */
public class MigrateConfiguration {

	public static void main(String[] args) {

		MOAIDConfCLI cli = new MOAIDConfCLI();
		MigrateConfigurationParams parsedParameters = cli.parse(args);

		// consider settings of force switch
		boolean isOverwriteData = parsedParameters.isOverwriteData();
		ConfigurationUtil configUtil = new ConfigurationUtil(isOverwriteData);

		if (!parsedParameters.isInputDB() && (parsedParameters.getInputTarget() != null)) {
			// read input from file
			workWithInputFromFile(parsedParameters.getInputTarget(), parsedParameters, configUtil);

		} else if (parsedParameters.getInputDBConfig() != null) {
			// read input from database
			workWithImputFromDB(parsedParameters, configUtil);

		} else {
			System.exit(1);
		}
	}

	/**
	 * Handle the case where input from a file is read.
	 * 
	 * @param inputFileUrl
	 *            the url of the input file.
	 * @param parsedParameters
	 *            the command line parameters.
	 * @param configUtil
	 *            the class for working with the configuration.
	 */
	private static void workWithInputFromFile(String inputFileUrl, MigrateConfigurationParams parsedParameters,
			ConfigurationUtil configUtil) {
		File inFile = new File(inputFileUrl);
		try (FileInputStream inStream = new FileInputStream(inFile);) {

			if (!parsedParameters.isOutputDB() && (parsedParameters.getOutputFile() != null)) {
				// input from file and output to a file is desired
				File outFile = new File(parsedParameters.getOutputFile());
				configUtil.readFromXMLFileConvertToPropertyFile(inStream, outFile);

			} else if (parsedParameters.getOutputDBConfig() != null) {
				// input from file and output to a database is desired
				configUtil.readFromFileWriteToDB(inStream, parsedParameters.getOutputDBConfig());
			}
		} catch (JAXBException e) {
			System.out.println("MOA-ID XML configuration can not be loaded from given file.");
			System.exit(1);
		} catch (FileNotFoundException e) {
			System.out.println("Could not find the input file.");
			System.exit(1);
		} catch (IOException e) {
			System.out.println("Could not read from the input file.");
			System.exit(1);
		}
	}

	/**
	 * Handle the case where input is read from a database.
	 * 
	 * @param parsedParameters
	 *            the command line parameters.
	 * @param configUtil
	 *            the class for working with the configuration.
	 */
	private static void workWithImputFromDB(MigrateConfigurationParams parsedParameters, ConfigurationUtil configUtil) {
		if (!parsedParameters.isOutputDB() && (parsedParameters.getOutputFile() != null)) {
			// input from database and output to a file is desired
			File outFile = new File(parsedParameters.getOutputFile());
			String inputDBConfigFilePath = parsedParameters.getInputDBConfig();
			configUtil.readFromDBWriteToFile(inputDBConfigFilePath, outFile);

		} else if (parsedParameters.getOutputDBConfig() != null) {
			// input from database and output to a database is desired
			// configUtil.readFromDBWriteToDB(inDBConfigFilePath,
			// outDBConfigFilePath);
		}
	}
}