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/*
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package jnr.constants;

import java.nio.ByteOrder;
import java.util.HashMap;
import java.util.Map;

/**
 * Platform specific constants.
 */
public final class Platform {
    private static final Platform INSTANCE = new Platform();

    public static Platform getPlatform() {
        return INSTANCE;
    }

    private static final class PackageNameResolver {
        public static final String PACKAGE_NAME = new PackageNameResolver().inferPackageName();

        private String inferPackageName() {
            try {
                Class cls = getClass();
                Package pkg = cls.getPackage();
                return pkg != null ? pkg.getName(): cls.getName().substring(0, cls.getName().lastIndexOf('.'));
            } catch (NullPointerException npe) {
                return "jnr.constants";
            }
        }
    }

    private Platform() { }

    private static String getConstantsPackageName() {
        return PackageNameResolver.PACKAGE_NAME;
    }

    public String[] getPackagePrefixes() {
        return new String[] {
            getArchPackageName(),
            getOSPackageName(),
            getFakePackageName(),
        };
    }

    public String getArchPackageName() {
        return String.format("%s.platform.%s.%s", getConstantsPackageName(), OS, ARCH);
    }

    public String getOSPackageName() {
        return String.format("%s.platform.%s", getConstantsPackageName(), OS);
    }

    public String getFakePackageName() {
        return String.format("%s.platform.fake", getConstantsPackageName());
    }

    public static final Map OS_NAMES = new HashMap() {{
            put("Mac OS X", "darwin");
        }
        public static final long serialVersionUID = 1L;
    };

    public static final Map ARCH_NAMES = new HashMap() {{
            put("x86", "i386");
        }
        public static final long serialVersionUID = 1L;
    };

    private static String initOperatingSystem() {
        String osname = getProperty("os.name", "unknown").toLowerCase();
        for (String s : OS_NAMES.keySet()) {
            if (s.equalsIgnoreCase(osname)) {
                return OS_NAMES.get(s);
            }
        }
        if (osname.startsWith("windows")) {
            return "windows";
        }
        return osname;
    }

    private static final String initArchitecture() {
        String arch = getProperty("os.arch", "unknown").toLowerCase();
        for (String s : ARCH_NAMES.keySet()) {
            if (s.equalsIgnoreCase(arch)) {
                return ARCH_NAMES.get(s);
            }
        }
        return arch;
    }
    public static final String ARCH = initArchitecture();
    public static final String OS = initOperatingSystem();
    public static final String NAME = String.format("%s-%s", ARCH, OS);

    public static final int BIG_ENDIAN = 4321;
    public static final int LITTLE_ENDIAN = 1234;
    public static final int BYTE_ORDER = ByteOrder.nativeOrder().equals(ByteOrder.BIG_ENDIAN) ? BIG_ENDIAN : LITTLE_ENDIAN;

    private static String getProperty(String property, String defValue) {
        try {
            return System.getProperty(property, defValue);
        } catch (SecurityException se) {
            return defValue;
        }
    }
}