/*
 * [Ensure.java]
 *
 * Summary: Ensure each of a list of files exists.
 *
 * Copyright: (c) 2016-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.0 2016-06-13 initial.
 */
package com.mindprod.ensure;

import com.mindprod.common18.EIO;
import com.mindprod.common18.ST;
import com.mindprod.csv.CSVReader;

import java.io.EOFException;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

import static java.lang.System.*;

/**
 * Ensure each of a list of files exists.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0 2016-06-13 initial.
 * @since 2016-06-13
 */
public class Ensure
    {
    // todo: add aption second coulumn date/time

    /**
     * when program first copyrighted
     */
    private static final int FIRST_COPYRIGHT_YEAR = 2016;

    /**
     * embedded version string.
     */
    @SuppressWarnings( { "UnusedDeclaration" } )
    private static final String VERSION_STRING = "1.0";

    /**
     * undisplayed copyright notice
     */
    @SuppressWarnings( { "UnusedDeclaration" } )
    private static final String EMBEDDED_COPYRIGHT =
            "Copyright: (c) 2016-2017 Roedy Green, Canadian Mind Products, http://mindprod.com";

    @SuppressWarnings( { "UnusedDeclaration" } )
    private static final String RELEASE_DATE = "2016-06-13";

    private static final String USAGE = "Ensure [list.csv] list of filenames to check";

    public static void main( final String[] args )
        {
        if ( args.length != 1 )
            {
            throw new IllegalArgumentException( USAGE );
            }
        int missing = 0;
        try
            {
            final CSVReader r = new CSVReader( new FileReader( args[ 0 ] ) );
            try
                {
                while ( true )
                    {
                    final String filename = r.get();
                    r.skipToNextLine();
                    if ( ST.isEmpty( filename ) )
                        {
                        continue;
                        }
                    final File file = new File( filename );
                    if ( !file.exists() )
                        {
                        err.println( "Missing " + EIO.getCanOrAbsPath( file ) );
                        missing++;
                        }
                    }
                }
            catch ( EOFException e )
                {
                r.close();
                }
            }
        catch ( IOException e )
            {
            err.println( "Problem reading file list " + e.getMessage() );
            }
        err.println( missing + " missing files." );
        }
    }