/*******************************************************************************
 * ============LICENSE_START==================================================
 * * org.onap.dmaap
 * * ===========================================================================
 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * * ===========================================================================
 * * Licensed under the Apache License, Version 2.0 (the "License");
 * * you may not use this file except in compliance with the License.
 * * You may obtain a copy of the License at
 * * 
 *  *      http://www.apache.org/licenses/LICENSE-2.0
 * * 
 *  * Unless required by applicable law or agreed to in writing, software
 * * distributed under the License is distributed on an "AS IS" BASIS,
 * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * * See the License for the specific language governing permissions and
 * * limitations under the License.
 * * ============LICENSE_END====================================================
 * *
 * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * *
 ******************************************************************************/


package com.att.research.datarouter.reports;

import java.lang.reflect.Constructor;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;

/**
 * This class provides a CLI to generate any of the reports defined in this package.
 *
 * @author Robert P. Eby
 * @version $Id: Report.java,v 1.2 2013/11/06 16:23:55 eby Exp $
 */
public class Report {
	/**
	 * Generate .csv report files from the database.  Usage:
	 * <pre>
	 * java com.att.research.datarouter.reports.Report [ -t <i>type</i> ] [ -o <i>outfile</i> ] [ <i>fromdate</i> [ <i>todate</i> ]]
	 * </pre>
	 * <i>type</i> should be <b>volume</b> for a {@link VolumeReport},
	 * <b>feed</b> for a {@link FeedReport},
	 * <b>latency</b> for a {@link LatencyReport}, or
	 * <b>dailyLatency</b> for a {@link DailyLatencyReport}.
	 * If <i>outfile</i> is not specified, the report goes into a file <i>/tmp/nnnnnnnnnnnnn.csv</i>,
	 * where nnnnnnnnnnnnn is the current time in milliseconds.
	 * If <i>from</i> and <i>to</i> are not specified, then the report is limited to the last weeks worth of data.
	 * <i>from</i> can be the keyword <b>ALL</b> to specify all data in the DB, or the keyword <b>yesterday</b>.
	 * Otherwise, <i>from</i> and <i>to</i> should match the pattern YYYY-MM-DD.
	 * @param args the command line arguments
	 */
	public static void main(String[] args) {
		ReportBase report = new VolumeReport();
		String outfile = "/tmp/" + System.currentTimeMillis() + ".csv";
		String from = null, to = null;

		for (int i = 0; i < args.length; i++) {
			if (args[i].equals("-?")) {
				System.err.println("usage: java com.att.research.datarouter.reports.Report [ -t <i>type</i> ] [ -o <i>outfile</i> ] [ <i>fromdate</i> [ <i>todate</i> ]]");
				System.exit(0);
			} else if (args[i].equals("-o")) {
				if (++i < args.length) {
					outfile = args[i];
				}
			} else if (args[i].equals("-t")) {
				if (++i < args.length) {
					String base = args[i];
					base = Character.toUpperCase(base.charAt(0)) + base.substring(1);
					base = "com.att.research.datarouter.reports."+base+"Report";
					try {
						@SuppressWarnings("unchecked")
						Class<? extends ReportBase> cl = (Class<? extends ReportBase>) Class.forName(base);
						Constructor<? extends ReportBase> con = cl.getConstructor();
						report = con.newInstance();
					} catch (Exception e) {
						System.err.println("Unknown report type: "+args[i]);
						System.exit(1);
					}
				}
			} else if (from == null) {
				from = args[i];
			} else {
				to = args[i];
			}
		}
		long lfrom = 0, lto = 0;
		if (from == null) {
			// last 7 days
			TimeZone utc = TimeZone.getTimeZone("UTC");
			Calendar cal = new GregorianCalendar(utc);
			cal.set(Calendar.HOUR_OF_DAY, 0);
			cal.set(Calendar.MINUTE, 0);
			cal.set(Calendar.SECOND, 0);
			cal.set(Calendar.MILLISECOND, 0);
			lfrom = cal.getTimeInMillis() - (7 * 24 * 60 * 60 * 1000L);	// 1 week
			lto   = cal.getTimeInMillis() - 1;
		} else if (to == null) {
			try {
				String[] dates = getDates(from);
				lfrom = Long.parseLong(dates[0]);
				lto   = Long.parseLong(dates[1]);
			} catch (Exception e) {
				System.err.println("Invalid date: "+from);
				System.exit(1);
			}
		} else {
			String[] dates;
			try {
				dates = getDates(from);
				lfrom = Long.parseLong(dates[0]);
			} catch (Exception e) {
				System.err.println("Invalid date: "+from);
				System.exit(1);
			}
			try {
				dates = getDates(to);
				lto   = Long.parseLong(dates[0]);
			} catch (Exception e) {
				System.err.println("Invalid date: "+to);
				System.exit(1);
			}
		}

		report.setFrom(lfrom);
		report.setTo(lto);
		report.setOutputFile(outfile);
		report.run();
	}

	private static String[] getDates(String d) throws Exception {
		if (d.equals("ALL"))
			return new String[] { "1", ""+System.currentTimeMillis() };

		TimeZone utc = TimeZone.getTimeZone("UTC");
		Calendar cal = new GregorianCalendar(utc);
		if (d.matches("20\\d\\d-\\d\\d-\\d\\d")) {
			cal.set(Calendar.YEAR,         Integer.parseInt(d.substring(0, 4)));
			cal.set(Calendar.MONTH,        Integer.parseInt(d.substring(5, 7))-1);
			cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(d.substring(8, 10)));
		} else if (d.equals("yesterday")) {
			cal.add(Calendar.DAY_OF_YEAR, -1);
		} else
			throw new Exception("wa?");
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, 0);
		long start = cal.getTimeInMillis();
		long end   = start + (24 * 60 * 60 * 1000L) - 1;
		return new String[] { ""+start, ""+end };
	}
}