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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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/*
 * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
 * (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
 *
 * The original version of this source code and documentation
 * is copyrighted and owned by Taligent, Inc., a wholly-owned
 * subsidiary of IBM. These materials are provided under terms
 * of a License Agreement between Taligent and Sun. This technology
 * is protected by multiple US and International patents.
 *
 * This notice and attribution to Taligent may not be removed.
 * Taligent is a registered trademark of Taligent, Inc.
 *
 */

package sun.util.resources;

import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.spi.ResourceBundleProvider;
import sun.util.locale.provider.JRELocaleProviderAdapter;
import sun.util.locale.provider.LocaleProviderAdapter;
import static sun.util.locale.provider.LocaleProviderAdapter.Type.CLDR;
import static sun.util.locale.provider.LocaleProviderAdapter.Type.JRE;
import sun.util.locale.provider.ResourceBundleBasedAdapter;

/**
 * Provides information about and access to resource bundles in the
 * sun.text.resources and sun.util.resources packages or in their corresponding
 * packages for CLDR.
 *
 * @author Asmus Freytag
 * @author Mark Davis
 */

public class LocaleData {
    private static final ResourceBundle.Control defaultControl
        = ResourceBundle.Control.getControl(ResourceBundle.Control.FORMAT_DEFAULT);

    private static final String DOTCLDR      = ".cldr";

    // Map of key (base name + locale) to candidates
    private static final Map<String, List<Locale>> CANDIDATES_MAP = new ConcurrentHashMap<>();

    private final LocaleProviderAdapter.Type type;

    public LocaleData(LocaleProviderAdapter.Type type) {
        this.type = type;
    }

    /**
     * Gets a calendar data resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public ResourceBundle getCalendarData(Locale locale) {
        return getBundle(type.getUtilResourcesPackage() + ".CalendarData", locale);
    }

    /**
     * Gets a currency names resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public OpenListResourceBundle getCurrencyNames(Locale locale) {
        return (OpenListResourceBundle) getBundle(type.getUtilResourcesPackage() + ".CurrencyNames", locale);
    }

    /**
     * Gets a locale names resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public OpenListResourceBundle getLocaleNames(Locale locale) {
        return (OpenListResourceBundle) getBundle(type.getUtilResourcesPackage() + ".LocaleNames", locale);
    }

    /**
     * Gets a time zone names resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public TimeZoneNamesBundle getTimeZoneNames(Locale locale) {
        return (TimeZoneNamesBundle) getBundle(type.getUtilResourcesPackage() + ".TimeZoneNames", locale);
    }

    /**
     * Gets a break iterator info resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public ResourceBundle getBreakIteratorInfo(Locale locale) {
        return getBundle(type.getTextResourcesPackage() + ".BreakIteratorInfo", locale);
    }

    /**
     * Gets a break iterator resources resource bundle, using
     * privileges to allow accessing a sun.* package.
     */
    public ResourceBundle getBreakIteratorResources(Locale locale) {
        return getBundle(type.getTextResourcesPackage() + ".BreakIteratorResources", locale);
    }

    /**
     * Gets a collation data resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public ResourceBundle getCollationData(Locale locale) {
        return getBundle(type.getTextResourcesPackage() + ".CollationData", locale);
    }

    /**
     * Gets a date format data resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public ResourceBundle getDateFormatData(Locale locale) {
        return getBundle(type.getTextResourcesPackage() + ".FormatData", locale);
    }

    /**
     * Gets a number format data resource bundle, using privileges
     * to allow accessing a sun.* package.
     */
    public ResourceBundle getNumberFormatData(Locale locale) {
        return getBundle(type.getTextResourcesPackage() + ".FormatData", locale);
    }

    public static ResourceBundle getBundle(final String baseName, final Locale locale) {
        return Bundles.of(baseName, locale, LocaleDataStrategy.INSTANCE);
    }

    public abstract static class LocaleDataResourceBundleProvider
                                            implements ResourceBundleProvider {
        /**
         * Changes baseName to its module dependent package name and
         * calls the super class implementation. For example,
         * if the baseName is "sun.text.resources.FormatData" and locale is ja_JP,
         * the baseName is changed to "sun.text.resources.ext.FormatData". If
         * baseName contains ".cldr", such as "sun.text.resources.cldr.FormatData",
         * the name is changed to "sun.text.resources.cldr.ext.FormatData".
         */
        protected String toBundleName(String baseName, Locale locale) {
            return LocaleDataStrategy.INSTANCE.toBundleName(baseName, locale);
        }

        /**
         * Retrieves the other bundle name for legacy ISO 639 languages.
         */
        protected String toOtherBundleName(String baseName, String bundleName, Locale locale) {
            return Bundles.toOtherBundleName(baseName, bundleName, locale);
        }
    }

    // Bundles.Strategy implementations

    private static class LocaleDataStrategy implements Bundles.Strategy {
        private static final LocaleDataStrategy INSTANCE = new LocaleDataStrategy();
        // TODO: avoid hard-coded Locales
        private static final Set<Locale> JAVA_BASE_LOCALES
            = Set.of(Locale.ROOT, Locale.ENGLISH, Locale.US, Locale.of("en", "US", "POSIX"));

        private LocaleDataStrategy() {
        }

        /*
         * This method overrides the default implementation to search
         * from a prebaked locale string list to determine the candidate
         * locale list.
         *
         * @param baseName the resource bundle base name.
         *        locale   the requested locale for the resource bundle.
         * @return a list of candidate locales to search from.
         * @exception NullPointerException if baseName or locale is null.
         */
        @Override
        public List<Locale> getCandidateLocales(String baseName, Locale locale) {
            String key = baseName + '-' + locale.toLanguageTag();
            List<Locale> candidates = CANDIDATES_MAP.get(key);
            if (candidates == null) {
                LocaleProviderAdapter.Type type = baseName.contains(DOTCLDR) ? CLDR : JRE;
                LocaleProviderAdapter adapter = LocaleProviderAdapter.forType(type);
                candidates = adapter instanceof ResourceBundleBasedAdapter rbba ?
                    rbba.getCandidateLocales(baseName, locale) :
                    defaultControl.getCandidateLocales(baseName, locale);

                // Weed out Locales which are known to have no resource bundles
                int lastDot = baseName.lastIndexOf('.');
                String category = (lastDot >= 0) ? baseName.substring(lastDot + 1) : baseName;
                if (adapter instanceof JRELocaleProviderAdapter jlpa) {
                    var langtags = jlpa.getLanguageTagSet(category);
                    if (!langtags.isEmpty()) {
                        for (Iterator<Locale> itr = candidates.iterator(); itr.hasNext();) {
                            if (!jlpa.isSupportedProviderLocale(itr.next(), langtags)) {
                                itr.remove();
                            }
                        }
                    }
                }
                CANDIDATES_MAP.putIfAbsent(key, candidates);
            }
            return candidates;
        }

        boolean inJavaBaseModule(String baseName, Locale locale) {
            return JAVA_BASE_LOCALES.contains(locale);
        }

        @Override
        public String toBundleName(String baseName, Locale locale) {
            String newBaseName = baseName;
            if (!inJavaBaseModule(baseName, locale)) {
                if (baseName.startsWith(JRE.getUtilResourcesPackage())
                        || baseName.startsWith(JRE.getTextResourcesPackage())) {
                    // Assume the lengths are the same.
                    assert JRE.getUtilResourcesPackage().length()
                        == JRE.getTextResourcesPackage().length();
                    int index = JRE.getUtilResourcesPackage().length();
                    if (baseName.indexOf(DOTCLDR, index) > 0) {
                        index += DOTCLDR.length();
                    }
                    newBaseName = baseName.substring(0, index + 1) + "ext"
                                      + baseName.substring(index);
                }
            }
            return defaultControl.toBundleName(newBaseName, locale);
        }

        @Override
        public Class<? extends ResourceBundleProvider> getResourceBundleProviderType(String baseName,
                                                                                     Locale locale) {
            return inJavaBaseModule(baseName, locale) ?
                        null : LocaleDataResourceBundleProvider.class;
        }
    }
}