/*--

 Copyright (C) 2011-2014 Jason Hunter & Brett McLaughlin.
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions, and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions, and the disclaimer that follows
    these conditions in the documentation and/or other materials
    provided with the distribution.

 3. The name "JDOM" must not be used to endorse or promote products
    derived from this software without prior written permission.  For
    written permission, please contact <request_AT_jdom_DOT_org>.

 4. Products derived from this software may not be called "JDOM", nor
    may "JDOM" appear in their name, without prior written permission
    from the JDOM Project Management <request_AT_jdom_DOT_org>.

 In addition, we request (but do not require) that you include in the
 end-user documentation provided with the redistribution and/or in the
 software itself an acknowledgement equivalent to the following:
     "This product includes software developed by the
      JDOM Project (http://www.jdom.org/)."
 Alternatively, the acknowledgment may be graphical using the logos
 available at http://www.jdom.org/images/logos.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 This software consists of voluntary contributions made by many
 individuals on behalf of the JDOM Project and was originally
 created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
 Brett McLaughlin <brett_AT_jdom_DOT_org>.  For more information
 on the JDOM Project, please see <http://www.jdom.org/>.

 */


package org.jdom2.contrib.perf;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


@SuppressWarnings("javadoc")
public class PerfTest {
	
	public static final long timeRun(TimeRunnable torun) throws Exception {
		long min = Long.MAX_VALUE;
		long max = Long.MIN_VALUE;
		long sum = 0L;
		final int cnt = 12;
		for (int i = 0 ; i < cnt; i++) {
			System.gc();
			long time = System.nanoTime();
			torun.run();
			time = System.nanoTime() - time;
			if (time > max) {
				max = time;
			}
			if (time < min) {
				min = time;
			}
			sum += time;
		}
		return (sum - (min + max)) / (cnt - 2);
	}


	public static final long usedMem() {
		long mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
		boolean stable = false;
		Thread gct = new Thread("GCPrompt") {
			@Override
			public void run() {
				System.gc();
			}
		};
		gct.setDaemon(true);
		try {
			gct.start();
			Thread.sleep(100);
			gct.join();
		} catch (Exception e) {
			// ignore;
		}
		do {
			int cnt = 3;
			while (--cnt >= 0) {
				System.gc();
			}
			long tmpmem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
			long diff = mem - tmpmem;
			mem = tmpmem;
			if (diff >= 0 && diff < 128) {
				stable = true;
			}
		} while (!stable);
		return mem;
	}
	
	private static final String[] suffix = new String[]{"Bytes", "KiB", "MiB", "GiB", "TiB" };
	
	private static final String formatMem(long mem) {
		double frac = mem;
		int cnt = 0;
		while (frac > 1024.0) {
			frac /= 1024.0;
			cnt++;
		}
		return String.format("%.2f%s", frac, suffix[cnt]);
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ArrayList<File> infiles = new ArrayList<File>();
		
		final FileFilter filefilter = new FileFilter() {
			@Override
			public boolean accept(File path) {
				return path.isFile() && path.getName().toLowerCase().endsWith(".xml");
			}
		};
		
		for (String arg : args) {
			File f = new File(arg);
			if (f.exists()) {
				if (f.isFile() && f.getName().toLowerCase().endsWith(".xml")) {
					infiles.add(f);
				} else if (f.isDirectory()) {
					File[] files = f.listFiles(filefilter);
					if (files.length > 0) {
						for (File sf : files) {
							infiles.add(sf);
						}
					} else {
						System.err.println("Ignoring File " + f + ": Directory has no XML files.");
					}
				} else {
					System.err.println("Ignoring File " + f + ": not .xml and not Directory.");
				}
			} else {
				System.err.println("Ignoring File " + f + ": does not exist.");
			}
		}
		
		if (infiles.isEmpty()) {
			File tryhamlet = new File("contrib/src/resources/hamlet.xml");
			if (tryhamlet.exists()) {
				System.out.println("Using default file " + tryhamlet);
				infiles.add(tryhamlet);
			}
		}
		
		System.out.printf("Processing %d files.\n", infiles.size());

		StringBuilder html = new StringBuilder();
		
		perfloop(infiles, html);
		perfloop(infiles, html);
		System.out.println("Ignore the above warm-up results!\n\n");
		
		html.setLength(0);
		html.append("\n\t<hr/>\n\t<p/>\n\tDescription - change me\n\t<br />\n\t<table border=\"1\">\n\t\t<tr>");
		for (String h : new String[] {"Input", "JDOM", "SAX", "SAXJ", "DOM", "DOMJ", 
				"StAXS", "StAXSJ", "StAXE", "StAXEJ", "Scan", "Dump", 
				"Dupe", "XPath", "Checked", "UnChecked"}) {
			html.append("<th>").append(h).append("</th>");
		}
		html.append("</tr>\n");
		
		for (int i = 0; i < 5; i++) {
			perfloop(infiles, html);
		}
		
		html.append("\t</table>\n");
		
		System.out.println(html.toString());
	}
	
	private static final void perfloop(List<File> infiles, StringBuilder html) {
		
		double mstime = 1000000.0;
		
		PerfDoc[] docs = new PerfDoc[infiles.size()];
		int cnt = 0;
		long bytecnt = 0L;
		for (File f : infiles) {
			try {
				docs[cnt++] = new PerfDoc(f);
			} catch (IOException e) {
				throw new IllegalStateException("Unable to load " + f, e);
			}
			bytecnt += f.length();
		}
		
		long loadmem = 0L;
		long saxtime = 0L;
		long saxdtime = 0L;
		
		
		long startmem = usedMem();
		for (PerfDoc pd : docs) {
			try {
				saxtime += pd.saxLoad();
				loadmem += pd.getLoadMem();
				saxdtime += pd.getSaxDTime();
//				System.out.println("Loaded " + pd.getFile());
			} catch (Exception e) {
				System.err.println("Failed to load " + pd);
				e.printStackTrace();
			}
		}
		
		long actloadmem = usedMem() - startmem;
		
		double pctdiff = ((actloadmem - loadmem) * 100.0) / actloadmem;
		if (pctdiff < 0.0) {
			pctdiff = -1.0 * pctdiff;
		}
		if (pctdiff > 1.0) {
			throw new IllegalStateException(
					String.format("Memory calculations do not add up direct=%s sum=%s.",
							formatMem(actloadmem), formatMem(loadmem)));
		}
		
		usedMem();
		
		long domtime = 0L;
		long domdtime = 0L;
		for (PerfDoc pd : docs) {
			try {
				domtime += pd.domLoad();
				domdtime += pd.getDomDTime();
			} catch (Exception e) {
				System.err.println("Failed to DOM " + pd);
				e.printStackTrace();
			}
		}
		
		usedMem();
		
		long staxtime = 0L;
		long staxdtime = 0L;
		for (PerfDoc pd : docs) {
			try {
				staxtime += pd.staxLoad();
				staxdtime += pd.getStaxDTime();
			} catch (Exception e) {
				System.err.println("Failed to STAX " + pd);
				e.printStackTrace();
			}
		}

		usedMem();
		
		long staxetime = 0L;
		long staxdetime = 0L;
		for (PerfDoc pd : docs) {
			try {
				staxetime += pd.staxELoad();
				staxdetime += pd.getStaxDETime();
			} catch (Exception e) {
				System.err.println("Failed to STAX " + pd);
				e.printStackTrace();
			}
		}

		long scantime = 0L;
		for (PerfDoc pd : docs) {
			try {
				scantime += pd.scan();
			} catch (Exception e) {
				System.err.println("Failed to scan " + pd);
				e.printStackTrace();
			}
		}
		
		usedMem();
		
		long dumptime = 0L;
		for (PerfDoc pd : docs) {
			try {
				dumptime += pd.dump();
			} catch (Exception e) {
				System.err.println("Failed to dump " + pd);
				e.printStackTrace();
			}
		}
		
		usedMem();
		
		long dupetime = 0L;
		for (PerfDoc pd : docs) {
			try {
				dupetime += pd.duplicate();
			} catch (Exception e) {
				System.err.println("Failed to dupe " + pd);
				e.printStackTrace();
			}
		}
		
		usedMem();
		
		long xpathtime = 0L;
		for (PerfDoc pd : docs) {
			try {
				xpathtime += pd.xpath();
			} catch (Exception e) {
				System.err.println("Failed to xpath " + pd);
				e.printStackTrace();
			}
		}
		
		usedMem();
		
		long checkedtime = 0L;
		for (PerfDoc pd : docs) {
			try {
				checkedtime += pd.checkedParse();
			} catch (Exception e) {
				System.err.println("Failed to checked-parse " + pd);
				e.printStackTrace();
			}
		}
		
		long uncheckedtime = 0L;
		for (PerfDoc pd : docs) {
			try {
				uncheckedtime += pd.unCheckedParse();
			} catch (Exception e) {
				System.err.println("Failed to unchecked-parse " + pd);
				e.printStackTrace();
			}
		}
		
		System.out.printf ("PERF: loadbytes=%s loadmem=%s sax=%.2fb(%.2fb) dom=%.2fb(%.2fb) " +
				"staxs=%.2fb(%.2fb)  staxe=%.2fb(%.2fb) " +
				"scan=%.2fb dump=%.2fb dupe=%.2fb xpath=%.2fb checked=%.2fb unchecked=%.2fb \n", 
				formatMem(bytecnt), formatMem(loadmem), saxtime / mstime, saxdtime / mstime, 
				domtime / mstime, domdtime / mstime, staxtime / mstime, staxdtime / mstime,
				staxetime / mstime, staxdetime / mstime,
				scantime / mstime, dumptime / mstime, dupetime / mstime, 
				xpathtime / mstime, checkedtime / mstime, uncheckedtime / mstime);

		html.append("\t\t<tr><td>").append(formatMem(bytecnt)).append("</td><td>")
			.append(formatMem(loadmem)).append("</td>");
		
		long[] times = new long[] {saxtime, saxtime - saxdtime, domtime, domtime - domdtime, 
				staxtime, staxtime - staxdtime, staxetime, staxetime - staxdetime, 
				scantime, dumptime, dupetime, 
					xpathtime, checkedtime, uncheckedtime};
		for (long t : times) {
			html.append("<td>").append(String.format("%.2fms", t / mstime)).append("</td>");
		}
		html.append("</tr>\n");
		
		
	}

}
