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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
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 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
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package org.scijava.platform;

import java.io.IOException;
import java.net.URL;

import org.scijava.Disposable;
import org.scijava.plugin.Plugin;
import org.scijava.plugin.SingletonPlugin;

/**
 * An interface for configuring a specific deployment platform, defined by
 * criteria such as operating system, machine architecture or Java version.
 * 
 * Platforms discoverable at runtime must implement this interface and be
 * annotated with @{@link Plugin} with attribute {@link Plugin#type()} =
 * {@link Platform}.class. While it possible to create a platform merely by
 * implementing this interface, it is encouraged to instead extend
 * {@link AbstractPlatform}, for convenience.
 * 
 * 
 * @author Curtis Rueden
 * @see Plugin
 * @see PlatformService
 */
public interface Platform extends SingletonPlugin, Disposable {

	/** Java Runtime Environment vendor to match. */
	default String javaVendor() {
		return null;
	}

	/** Minimum required Java Runtime Environment version. */
	default String javaVersion() {
		return null;
	}

	/** Operating system architecture to match. */
	default String osArch() {
		return null;
	}

	/** Operating system name to match. */
	default String osName() {
		return null;
	}

	/** Minimum required operating system version. */
	default String osVersion() {
		return null;
	}

	/** Determines whether the given platform is applicable to this runtime. */
	default boolean isTarget() {
		if (javaVendor() != null) {
			final String javaVendor = System.getProperty("java.vendor");
			if (!javaVendor.matches(".*" + javaVendor() + ".*")) return false;
		}

		if (javaVersion() != null) {
			final String javaVersion = System.getProperty("java.version");
			if (javaVersion.compareTo(javaVersion()) < 0) return false;
		}

		if (osName() != null) {
			final String osName = System.getProperty("os.name");
			if (!osName.matches(".*" + osName() + ".*")) return false;
		}

		if (osArch() != null) {
			final String osArch = System.getProperty("os.arch");
			if (!osArch.matches(".*" + osArch() + ".*")) return false;
		}

		if (osVersion() != null) {
			final String osVersion = System.getProperty("os.version");
			if (osVersion.compareTo(osVersion()) < 0) return false;
		}

		return true;
	}

	/** Activates and configures the platform. */
	void configure(PlatformService service);

	void open(URL url) throws IOException;

	/**
	 * Informs the platform of a UI's newly created application menu structure.
	 * The platform may choose to do something platform-specific with the menus.
	 * 
	 * @param menus The UI's newly created menu structure
	 * @return true iff the menus should not be added to the UI as normal because
	 *         the platform did something platform-specific with them instead.
	 */
	default boolean registerAppMenus(final Object menus) {
		return false;
	}
}