/*
 * Copyright (c) 2011 TMate Software Ltd
 *  
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * For information on how to redistribute this software under
 * the terms of a license other than GNU General Public License
 * contact TMate Software at support@hg4j.com
 */
package org.tmatesoft.hg.console;

import static org.tmatesoft.hg.repo.HgRepository.TIP;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.tmatesoft.hg.core.HgLogCommand;
import org.tmatesoft.hg.core.HgLogCommand.FileRevision;
import org.tmatesoft.hg.core.HgCatCommand;
import org.tmatesoft.hg.core.HgFileRevision;
import org.tmatesoft.hg.core.HgManifestCommand;
import org.tmatesoft.hg.core.Nodeid;
import org.tmatesoft.hg.internal.ByteArrayChannel;
import org.tmatesoft.hg.internal.DigestHelper;
import org.tmatesoft.hg.internal.PathGlobMatcher;
import org.tmatesoft.hg.repo.HgBranches;
import org.tmatesoft.hg.repo.HgChangelog;
import org.tmatesoft.hg.repo.HgDataFile;
import org.tmatesoft.hg.repo.HgInternals;
import org.tmatesoft.hg.repo.HgManifest;
import org.tmatesoft.hg.repo.HgMergeState;
import org.tmatesoft.hg.repo.HgRepository;
import org.tmatesoft.hg.repo.HgStatusCollector;
import org.tmatesoft.hg.repo.HgStatusInspector;
import org.tmatesoft.hg.repo.HgWorkingCopyStatusCollector;
import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
import org.tmatesoft.hg.util.Pair;
import org.tmatesoft.hg.util.Path;
import org.tmatesoft.hg.util.ProgressSupport;

/**
 * Various debug dumps. 
 * 
 * @author Artem Tikhomirov
 * @author TMate Software Ltd.
 */
public class Main {
	
	private Options cmdLineOpts;
	private HgRepository hgRepo;

	public Main(String[] args) throws Exception {
		cmdLineOpts = Options.parse(args);
		hgRepo = cmdLineOpts.findRepository();
		if (hgRepo.isInvalid()) {
			System.err.printf("Can't find repository in: %s\n", hgRepo.getLocation());
			return;
		}
		System.out.println("REPO:" + hgRepo.getLocation());
	}

	public static void main(String[] args) throws Exception {
		Main m = new Main(args);
		m.testReadWorkingCopy();
//		m.testParents();
//		m.testEffectiveFileLog();
//		m.testCatAtCsetRevision();
//		m.testMergeState();
//		m.testFileStatus();
//		m.dumpBranches();
//		m.inflaterLengthException();
//		m.dumpIgnored();
//		m.dumpDirstate();
//		m.testStatusInternals();
//		m.catCompleteHistory();
//		m.dumpCompleteManifestLow();
//		m.dumpCompleteManifestHigh();
//		m.bunchOfTests();
	}
	
	private void testReadWorkingCopy() throws Exception {
		for (String fname : cmdLineOpts.getList("")) {
			HgDataFile fn = hgRepo.getFileNode(fname);
			ByteArrayChannel sink = new ByteArrayChannel();
			fn.workingCopy(sink);
			System.out.printf("%s: read %d bytes of working copy", fname, sink.toArray().length);
		}
	}
	
	private void testParents() throws Exception {
		// hg parents cmd
		final Pair<Nodeid, Nodeid> wcParents = hgRepo.getWorkingCopyParents();
		ChangesetDumpHandler dump = new ChangesetDumpHandler(hgRepo);
		final HgChangelog clog = hgRepo.getChangelog();
		HgLogCommand cmd = new HgLogCommand(hgRepo);
		if (wcParents.hasFirst()) {
			int x = clog.getLocalRevision(wcParents.first());
			cmd.range(x, x).execute(dump); // FIXME HgLogCommand shall support Nodeid as revisions
		}
		if (wcParents.hasSecond()) {
			int x = clog.getLocalRevision(wcParents.second());
			cmd.range(x, x).execute(dump);
		}
	}
	
	// -R \temp\hg\hg4j-50 src/org/tmatesoft/hg/internal/RevlogStream.java
	private void testEffectiveFileLog() {
		for (String fname : cmdLineOpts.getList("")) {
			System.out.println(fname);
			HgDataFile fn = hgRepo.getFileNode(fname);
			if (fn.exists()) {
				fn.history(new HgChangelog.Inspector() {
					public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
						System.out.printf("%d:%s\n", revisionNumber, nodeid);
					}
				});
			}
		}
	}
	
	// TODO as test in TestCat
	private void testCatAtCsetRevision() throws Exception {
		HgCatCommand cmd = new HgCatCommand(hgRepo);
		cmd.file(Path.create("src/org/tmatesoft/hg/internal/RevlogStream.java"));
		cmd.changeset(Nodeid.fromAscii("08db726a0fb7914ac9d27ba26dc8bbf6385a0554"));
		final ByteArrayChannel sink = new ByteArrayChannel();
		cmd.execute(sink);
		System.out.println(sink.toArray().length);
	}
	
	private void testMergeState() throws Exception {
		final HgMergeState mergeState = hgRepo.getMergeState();
		mergeState.refresh();
		for (HgMergeState.Entry e : mergeState.getConflicts()) {
			System.out.println(e.getState() + " " + e.getActualFile());
			System.out.println("p1:       " + formatFileRevision(e.getFirstParent()));
			System.out.println("p2:       " + formatFileRevision(e.getSecondParent()));
			System.out.println("ancestor: " + formatFileRevision(e.getCommonAncestor()));
			System.out.println();
		}
	}
	
	private static String formatFileRevision(HgFileRevision r) throws Exception {
		final ByteArrayChannel sink = new ByteArrayChannel();
		r.putContentTo(sink);
		return String.format("%s %s (%d bytes)", r.getPath(), r.getRevision(), sink.toArray().length);
	}
	
	private void testFileStatus() {
//		final Path path = Path.create("src/org/tmatesoft/hg/util/");
//		final Path path = Path.create("src/org/tmatesoft/hg/internal/Experimental.java");
//		final Path path = Path.create("missing-dir/");
//		HgWorkingCopyStatusCollector wcsc = HgWorkingCopyStatusCollector.create(hgRepo, path);
		HgWorkingCopyStatusCollector wcsc = HgWorkingCopyStatusCollector.create(hgRepo, new PathGlobMatcher("mi**"));
		wcsc.walk(TIP, new StatusDump());
	}
	
	/*
	 * Straightforward approach to collect branches, no use of branchheads.cache
	 * First, single run - 18 563
	 * 10 runs (after 1 warm up) of HgBranches.collect took 167391 ms, ~17 seconds per run.
	 */
	private void dumpBranches() {
		final long start0 = System.currentTimeMillis();
		HgBranches b = hgRepo.getBranches();
		System.out.println("1:" + (System.currentTimeMillis() - start0));
		for (HgBranches.BranchInfo bi : b.getAllBranches()) {
			System.out.print(bi.getName());
//			if (bi.isClosed()) {
//				System.out.print("!");
//			}
//			System.out.print(" ");
//			System.out.print(bi.getStart());
			System.out.print(" ");
			System.out.println(bi.getHeads());
		}
//		final long start = System.currentTimeMillis();
//		for (int i = 0; i < 10; i++) {
//			b.collect(ProgressSupport.Factory.get(null));
//		}
//		System.out.println("10:" + (System.currentTimeMillis() - start));
	}
	
	private void inflaterLengthException() throws Exception {
		HgDataFile f1 = hgRepo.getFileNode("src/com/tmate/hgkit/console/Bundle.java");
		HgDataFile f2 = hgRepo.getFileNode("test-repos.jar");
		System.out.println(f1.isCopy());
		System.out.println(f2.isCopy());
		ByteArrayChannel bac = new ByteArrayChannel();
		f1.content(1, bac); // 0: 1151, 1: 1139
		System.out.println(bac.toArray().length);
		f2.content(0, bac = new ByteArrayChannel()); // 0: 14269
		System.out.println(bac.toArray().length);
	}
	
	private void dumpIgnored() {
		HgInternals debug = new HgInternals(hgRepo);
		String[] toCheck = new String[] {"design.txt", "src/com/tmate/hgkit/ll/Changelog.java", "src/Extras.java", "bin/com/tmate/hgkit/ll/Changelog.class"};
		boolean[] checkResult = debug.checkIgnored(toCheck);
		for (int i = 0; i < toCheck.length; i++) {
			System.out.println("Ignored " + toCheck[i] + ": " + checkResult[i]);
		}
	}
	
	private void dumpDirstate() {
		new HgInternals(hgRepo).dumpDirstate();
	}

	
	private void catCompleteHistory() throws Exception {
		DigestHelper dh = new DigestHelper();
		for (String fname : cmdLineOpts.getList("")) {
			System.out.println(fname);
			HgDataFile fn = hgRepo.getFileNode(fname);
			if (fn.exists()) {
				int total = fn.getRevisionCount();
				System.out.printf("Total revisions: %d\n", total);
				for (int i = 0; i < total; i++) {
					ByteArrayChannel sink = new ByteArrayChannel();
					fn.content(i, sink);
					System.out.println("==========>");
					byte[] content = sink.toArray();
					System.out.println(new String(content));
					int[] parentRevisions = new int[2];
					byte[] parent1 = new byte[20];
					byte[] parent2 = new byte[20];
					fn.parents(i, parentRevisions, parent1, parent2);
					System.out.println(dh.sha1(parent1, parent2, content).asHexString());
				}
			} else {
				System.out.println(">>>Not found!");
			}
		}
	}

	private void dumpCompleteManifestLow() {
		hgRepo.getManifest().walk(0, TIP, new ManifestDump());
	}

	public static final class ManifestDump implements HgManifest.Inspector {
		public boolean begin(int manifestRevision, Nodeid nid, int changelogRevision) {
			System.out.printf("%d : %s\n", manifestRevision, nid);
			return true;
		}

		public boolean next(Nodeid nid, String fname, String flags) {
			System.out.println(nid + "\t" + fname + "\t\t" + flags);
			return true;
		}

		public boolean end(int revision) {
			System.out.println();
			return true;
		}
	}

	private void dumpCompleteManifestHigh() {
		new HgManifestCommand(hgRepo).dirs(true).execute(new HgManifestCommand.Handler() {
			
			public void begin(Nodeid manifestRevision) {
				System.out.println(">> " + manifestRevision);
			}
			public void dir(Path p) {
				System.out.println(p);
			}
			public void file(FileRevision fileRevision) {
				System.out.print(fileRevision.getRevision());;
				System.out.print("   ");
				System.out.println(fileRevision.getPath());
			}
			
			public void end(Nodeid manifestRevision) {
				System.out.println();
			}
		}); 
	}

	private void bunchOfTests() throws Exception {
		HgInternals debug = new HgInternals(hgRepo);
		debug.dumpDirstate();
		final StatusDump dump = new StatusDump();
		dump.showIgnored = false;
		dump.showClean = false;
		HgStatusCollector sc = new HgStatusCollector(hgRepo);
		final int r1 = 0, r2 = 3;
		System.out.printf("Status for changes between revision %d and %d:\n", r1, r2);
		sc.walk(r1, r2, dump);
		// 
		System.out.println("\n\nSame, but sorted in the way hg status does:");
		HgStatusCollector.Record r = sc.status(r1, r2);
		sortAndPrint('M', r.getModified(), null);
		sortAndPrint('A', r.getAdded(), null);
		sortAndPrint('R', r.getRemoved(), null);
		//
		System.out.println("\n\nTry hg status --change <rev>:");
		sc.change(0, dump);
		System.out.println("\nStatus against working dir:");
		HgWorkingCopyStatusCollector wcc = new HgWorkingCopyStatusCollector(hgRepo);
		wcc.walk(TIP, dump);
		System.out.println();
		System.out.printf("Manifest of the revision %d:\n", r2);
		hgRepo.getManifest().walk(r2, r2, new ManifestDump());
		System.out.println();
		System.out.printf("\nStatus of working dir against %d:\n", r2);
		r = wcc.status(r2);
		sortAndPrint('M', r.getModified(), null);
		sortAndPrint('A', r.getAdded(), r.getCopied());
		sortAndPrint('R', r.getRemoved(), null);
		sortAndPrint('?', r.getUnknown(), null);
		sortAndPrint('I', r.getIgnored(), null);
		sortAndPrint('C', r.getClean(), null);
		sortAndPrint('!', r.getMissing(), null);
	}
	
	private void sortAndPrint(char prefix, List<Path> ul, Map<Path, Path> copies) {
		ArrayList<Path> sortList = new ArrayList<Path>(ul);
		Collections.sort(sortList);
		for (Path s : sortList)  {
			System.out.print(prefix);
			System.out.print(' ');
			System.out.println(s);
			if (copies != null && copies.containsKey(s)) {
				System.out.println("  " + copies.get(s));
			}
		}
	}


	private void testStatusInternals() {
		HgDataFile n = hgRepo.getFileNode(Path.create("design.txt"));
		for (String s : new String[] {"011dfd44417c72bd9e54cf89b82828f661b700ed", "e5529faa06d53e06a816e56d218115b42782f1ba", "c18e7111f1fc89a80a00f6a39d51288289a382fc"}) {
			// expected: 359, 2123, 3079
			byte[] b = s.getBytes();
			final Nodeid nid = Nodeid.fromAscii(b, 0, b.length);
			System.out.println(s + " : " + n.length(nid));
		}
	}

	static void force_gc() {
		Runtime.getRuntime().runFinalization();
		Runtime.getRuntime().gc();
		Thread.yield();
		Runtime.getRuntime().runFinalization();
		Runtime.getRuntime().gc();
		Thread.yield();
	}

	private static class StatusDump implements HgStatusInspector {
		public boolean hideStatusPrefix = false; // hg status -n option
		public boolean showCopied = true; // -C
		public boolean showIgnored = true; // -i
		public boolean showClean = true; // -c

		public void modified(Path fname) {
			print('M', fname);
		}

		public void added(Path fname) {
			print('A', fname);
		}

		public void copied(Path fnameOrigin, Path fnameAdded) {
			added(fnameAdded);
			if (showCopied) {
				print(' ', fnameOrigin);
			}
		}

		public void removed(Path fname) {
			print('R', fname);
		}

		public void clean(Path fname) {
			if (showClean) {
				print('C', fname);
			}
		}

		public void missing(Path fname) {
			print('!', fname);
		}

		public void unknown(Path fname) {
			print('?', fname);
		}

		public void ignored(Path fname) {
			if (showIgnored) {
				print('I', fname);
			}
		}
		
		private void print(char status, Path fname) {
			if (!hideStatusPrefix) {
				System.out.print(status);
				System.out.print(' ');
			}
			System.out.println(fname);
		}
	}
}