package de.vanitasvitae.imi.codes;

import java.io.File;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

public class Main {

    private static final String NAME_JAR = "imicodes";
    private static final String HELP_HEADER = "Generate ID codes for sample tubes.";
    private static final String HELP_FOOTER = "\nAuthor: Paul Schaub <paul.schaub@wwu.de>";

    public static void main(String[] args) {
        Options options = Arguments.getCommandLineOptions();
        CommandLineParser parser = new DefaultParser();

        CommandLine arguments;
        try {
            arguments = parser.parse(options, args);
        } catch (ParseException e) {
            System.out.println(e.getMessage());
            printHelp(options);
            return;
        }

        // User issues '-h', so just show help text and exit right now.
        if (arguments.hasOption(Arguments.HELP)) {
            printHelp(options);
            return;
        }

        // Parse arguments
        String studyNumber;
        SampleType sampleType;
        int numberOfCodes;
        File outputPath;
        boolean externalBrowser;

        try {
            studyNumber = InputValidator.validateStudyNumber(arguments.getOptionValue(Arguments.STUDY_NUMBER));
            sampleType = InputValidator.validateSampleType(arguments.getOptionValue(Arguments.SAMPLE_TYPE));
            numberOfCodes = InputValidator.validateNumberOfCodes(arguments.getOptionValue(Arguments.NUMBER_CODES));
            outputPath = InputValidator.validateOutputPath(arguments.getOptionValue(Arguments.OUTPUT_DESTINATION));
            externalBrowser = arguments.hasOption(Arguments.EXTERNAL_BROWSER);
        } catch (InvalidOptionException e) {
            // Something is wrong with the users input, so exit.
            System.out.println(e.getMessage());
            return;
        }

        // Debug. TODO: Remove
        System.out.println("StudyNr: " + studyNumber + " sampleType: " + sampleType + " #codes: " + numberOfCodes
                + " output: " + outputPath + " browser: " + externalBrowser);

        for (int i = 0; i < numberOfCodes; i++) {
            System.out.format("%s%04d%n", studyNumber + sampleType, i);
        }
    }

    /**
     * Print a descriptive help text to the console.
     *
     * @param options {@link Options} for which we want to print a help text.
     */
    private static void printHelp(Options options) {
        HelpFormatter formatter = new HelpFormatter();

        formatter.printHelp(NAME_JAR, HELP_HEADER, options, HELP_FOOTER, true);
    }


}