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/**
 * Oshi (https://github.com/dblock/oshi)
 * 
 * Copyright (c) 2010 - 2015 The Oshi Project Team
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * dblock[at]dblock[dot]org
 * alessandro[at]perucchi[dot]org
 * widdis[at]gmail[dot]com
 * https://github.com/dblock/oshi/graphs/contributors
 */
package oshi.software.os.mac.local;

import oshi.software.os.OperatingSystemVersion;

import com.sun.jna.LastErrorException;
import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.ptr.IntByReference;

/**
 * @author alessandro[at]perucchi[dot]org
 * @author widdis[at]gmail[dot]com
 */

public class OSVersionInfoEx implements OperatingSystemVersion {

	private String _version = null;
	private String _codeName = null;
	private String _versionStr = null;
	private String _buildNumber = null;

	public OSVersionInfoEx() {
	}

	/**
	 * @return the _version
	 */
	public String getVersion() {
		if (this._version == null)
			this._version = System.getProperty("os.version");
		return this._version;
	}

	/**
	 * @param version
	 *            the version to set
	 */
	public void setVersion(String version) {
		this._version = version;
	}

	/**
	 * @return the _codeName
	 */
	public String getCodeName() {
		if (this._codeName == null) {
			if (getVersion() != null) {
				String[] versionSplit = getVersion().split("\\.");
				if (versionSplit.length > 1 && versionSplit[0].equals("10")) {
					switch (Integer.parseInt(versionSplit[1])) {
					case 0:
						this._codeName = "Cheetah";
						break;
					case 1:
						this._codeName = "Puma";
						break;
					case 2:
						this._codeName = "Jaguar";
						break;
					case 3:
						this._codeName = "Panther";
						break;
					case 4:
						this._codeName = "Tiger";
						break;
					case 5:
						this._codeName = "Leopard";
						break;
					case 6:
						this._codeName = "Snow Leopard";
						break;
					case 7:
						this._codeName = "Lion";
						break;
					case 8:
						this._codeName = "Mountain Lion";
						break;
					case 9:
						this._codeName = "Mavericks";
						break;
					case 10:
						this._codeName = "Yosemite";
						break;
					case 11:
						this._codeName = "El Capitan";
						break;
					default:
						this._codeName = "";
					}

				} else
					this._codeName = "";
			}
		}
		return this._codeName;
	}

	/**
	 * @param codeName
	 *            the codeName to set
	 */
	public void setCodeName(String codeName) {
		this._codeName = codeName;
	}

	public String getBuildNumber() {
		if (this._buildNumber == null) {
			int[] mib = { SystemB.CTL_KERN, SystemB.KERN_OSVERSION };
			IntByReference size = new IntByReference();
			if (0 != SystemB.INSTANCE.sysctl(mib, mib.length, null, size, null,
					0))
				throw new LastErrorException("Error code: "
						+ Native.getLastError());
			Pointer p = new Memory(size.getValue() + 1);
			if (0 != SystemB.INSTANCE.sysctl(mib, mib.length, p, size, null, 0))
				throw new LastErrorException("Error code: "
						+ Native.getLastError());
			this._buildNumber = p.getString(0);
		}
		return this._buildNumber;
	}

	public void setBuildNumber(String buildNumber) {
		this._buildNumber = buildNumber;
	}

	@Override
	public String toString() {
		if (this._versionStr == null) {
			StringBuilder sb = new StringBuilder(getVersion());
			if (getCodeName().length() > 0)
				sb.append(" (").append(getCodeName()).append(")");
			sb.append(" build ").append(getBuildNumber());
			this._versionStr = sb.toString();
		}
		return this._versionStr;
	}
}