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/**
 * Copyright 2011 Alex Yanchenko
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */
package org.droidparts.util;

import static android.content.pm.ApplicationInfo.FLAG_DEBUGGABLE;
import static android.content.pm.PackageManager.GET_SIGNATURES;
import static android.content.pm.PackageManager.SIGNATURE_MATCH;

import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.provider.Settings.Secure;

public class AppUtils2 extends AppUtils {

	private final PackageManager pkgMngr;

	public AppUtils2(Context ctx) {
		super(ctx);
		pkgMngr = ctx.getPackageManager();
	}

	public boolean canInstallNonMarketApps() {
		return Secure.getInt(ctx.getContentResolver(),
				Secure.INSTALL_NON_MARKET_APPS, 0) != 0;
	}

	public boolean isDebuggable() {
		ApplicationInfo appInfo = ctx.getApplicationInfo();
		boolean debug = (appInfo.flags & FLAG_DEBUGGABLE) != 0;
		return debug;
	}

	public String getSignature(String pkgName) throws NameNotFoundException {
		PackageInfo pi = pkgMngr.getPackageInfo(pkgName, GET_SIGNATURES);
		String signature = pi.signatures[0].toCharsString();
		return signature;
	}

	public boolean doSignaturesMatch(String pkg1, String pkg2) {
		boolean match = pkgMngr.checkSignatures(pkg1, pkg2) == SIGNATURE_MATCH;
		return match;
	}

	public boolean isInstalledFromMarket(String pkgName)
			throws NameNotFoundException {
		String installerPkg = pkgMngr.getInstallerPackageName(pkgName);
		boolean installedFromMarket = "com.google.android.feedback"
				.equals(installerPkg);
		return installedFromMarket;
	}

	public long getClassesDexCrc() {
		ZipFile zf;
		try {
			zf = new ZipFile(ctx.getPackageCodePath());
		} catch (IOException e) {
			L.e(e);
			return -1;
		}
		ZipEntry ze = zf.getEntry("classes.dex");
		long crc = ze.getCrc();
		return crc;
	}

}