/*
    * Copyright (C) 2011, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.internal.storage.file;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.util.List;
  
  import org.eclipse.jgit.internal.storage.pack.CachedPack;
  import org.eclipse.jgit.internal.storage.pack.ObjectToPack;
  import org.eclipse.jgit.internal.storage.pack.PackExt;
  import org.eclipse.jgit.internal.storage.pack.PackOutputStream;
  import org.eclipse.jgit.internal.storage.pack.StoredObjectRepresentation;
  
  class LocalCachedPack extends CachedPack {
  	private final ObjectDirectory odb;
  
  	private final String[] packNames;
  
  	private Pack[] packs;
  
  	LocalCachedPack(ObjectDirectory odb, List<String> packNames) {
  		this.odb = odb;
  		this.packNames = packNames.toArray(new String[0]);
  	}
  
  	LocalCachedPack(List<Pack> packs) {
  		odb = null;
  		packNames = null;
  		this.packs = packs.toArray(new Pack[0]);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public long getObjectCount() throws IOException {
  		long cnt = 0;
  		for (Pack pack : getPacks())
  			cnt += pack.getObjectCount();
  		return cnt;
  	}
  
  	void copyAsIs(PackOutputStream out, WindowCursor wc)
  			throws IOException {
  		for (Pack pack : getPacks())
  			pack.copyPackAsIs(out, wc);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public boolean hasObject(ObjectToPack obj, StoredObjectRepresentation rep) {
  		try {
  			LocalObjectRepresentation local = (LocalObjectRepresentation) rep;
  			for (Pack pack : getPacks()) {
  				if (local.pack == pack)
  					return true;
  			}
  			return false;
  		} catch (FileNotFoundException packGone) {
  			return false;
  		}
  	}
  
  	private Pack[] getPacks() throws FileNotFoundException {
  		if (packs == null) {
  			Pack[] p = new Pack[packNames.length];
  			for (int i = 0; i < packNames.length; i++)
  				p[i] = getPackFile(packNames[i]);
  			packs = p;
  		}
  		return packs;
  	}
  
  	private Pack getPackFile(String packName) throws FileNotFoundException {
  		for (Pack pack : odb.getPacks()) {
  			if (packName.equals(pack.getPackName()))
  				return pack;
  		}
  		throw new FileNotFoundException(getPackFilePath(packName));
  	}
  
  	private String getPackFilePath(String packName) {
  		final File packDir = odb.getPackDirectory();
  		return new PackFile(packDir, packName, PackExt.PACK).getPath();
  	}
  }