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

import com.tmate.hgkit.fs.DataAccess;

/**
 *
 * @author artem
 */
public class HgManifest extends Revlog {

	/*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
		super(hgRepo, content);
	}

	public void walk(int start, int end, final Inspector inspector) {
		Revlog.Inspector insp = new Revlog.Inspector() {

			private boolean gtg = true; // good to go

			public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
				if (!gtg) {
					return;
				}
				gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true));
				int i;
				String fname = null;
				String flags = null;
				Nodeid nid = null;
				byte[] data = da.byteArray();
				for (i = 0; gtg && i < actualLen; i++) {
					int x = i;
					for( ; data[i] != '\n' && i < actualLen; i++) {
						if (fname == null && data[i] == 0) {
							fname = new String(data, x, i - x);
							x = i+1;
						}
					}
					if (i < actualLen) {
						assert data[i] == '\n'; 
						int nodeidLen = i - x < 40 ? i-x : 40;
						nid = Nodeid.fromAscii(data, x, nodeidLen);
						if (nodeidLen + x < i) {
							// 'x' and 'l' for executable bits and symlinks?
							// hg --debug manifest shows 644 for each regular file in my repo
							flags = new String(data, x + nodeidLen, i-x-nodeidLen);
						}
						gtg = gtg && inspector.next(nid, fname, flags);
					}
					nid = null;
					fname = flags = null;
				}
				gtg = gtg && inspector.end(revisionNumber);
			}
		};
		content.iterate(start, end, true, insp);
	}

	public interface Inspector {
		boolean begin(int revision, Nodeid nid);
		boolean next(Nodeid nid, String fname, String flags);
		boolean end(int revision);
	}
}