/*
 * Copyright (c) 2010, 2011 Artem Tikhomirov 
 */
package com.tmate.hgkit.console;

import java.util.Formatter;
import java.util.LinkedList;
import java.util.List;

import com.tmate.hgkit.fs.RepositoryLookup;
import com.tmate.hgkit.ll.Changeset;
import com.tmate.hgkit.ll.HgDataFile;
import com.tmate.hgkit.ll.HgRepository;
import com.tmate.hgkit.ll.Nodeid;

/**
 * @author artem
 */
public class Log {

	public static void main(String[] args) throws Exception {
		RepositoryLookup repoLookup = new RepositoryLookup();
		RepositoryLookup.Options cmdLineOpts = RepositoryLookup.Options.parse(args);
		HgRepository hgRepo = repoLookup.detect(cmdLineOpts);
		if (hgRepo.isInvalid()) {
			System.err.printf("Can't find repository in: %s\n", hgRepo.getLocation());
			return;
		}
		System.out.println(hgRepo.getLocation());
		final Dump dump = new Dump(hgRepo);
		dump.complete = false; //cmdLineOpts;
		dump.reverseOrder = true;
		if (cmdLineOpts.files.isEmpty()) {
			// no revisions and no limit
			hgRepo.getChangelog().all(dump);
			dump.complete();
		} else {
			for (String fname : cmdLineOpts.files) {
				HgDataFile f1 = hgRepo.getFileNode(fname);
				System.out.println("History of the file: " + f1.getPath());
				f1.history(dump);
				dump.complete();
			}
		}
		//
//		System.out.println("\n\n=========================");
//		System.out.println("Range 1-3:");
//		f1.history(1,3, callback);
		//
		//new ChangelogWalker().setFile("hello.c").setRevisionRange(1, 4).accept(new Visitor);
	}

	private static final class Dump implements Changeset.Inspector {
		// params
		boolean complete = false;
		boolean reverseOrder = false;
		// own
		private LinkedList<String> l = new LinkedList<String>();
		private final HgRepository repo;

		public Dump(HgRepository hgRepo) {
			this.repo = hgRepo;
		}

		public void next(int revisionNumber, Nodeid nodeid, Changeset cset) {
			final String s = print(revisionNumber, nodeid, cset);
			if (reverseOrder) {
				l.addFirst(s);
			} else {
				System.out.print(s);
			}
		}
		
		public void complete() {
			if (!reverseOrder) {
				return;
			}
			for (String s : l) {
				System.out.print(s);
			}
			l.clear();
		}

		private String print(int revNumber, Nodeid csetNodeid, Changeset cset) {
			StringBuilder sb = new StringBuilder();
			Formatter f = new Formatter(sb);
			f.format("changeset:   %d:%s\n", revNumber, complete ? csetNodeid : csetNodeid.shortNotation());
			if (complete) {
				f.format("parent:        %s\nparent:        %s\nmanifest:     %s", "-1", "-1", cset.manifest());
			}
			f.format("user:        %s\ndate:        %s\n", cset.user(), cset.dateString());
			if (complete) {
				final List<String> files = cset.files();
				sb.append("files:    ");
				for (String s : files) {
					sb.append(' ');
					sb.append(s);
				}
				f.format("description:\n%s\n\n", cset.comment());
			} else {
				f.format("summary:     %s\n\n", cset.comment());
			}
			if (cset.extras() != null) {
				f.format("extra:    " + cset.extras()); // TODO
			}
			return sb.toString();
		}
	}
}