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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.android.prefs;

import android.content.SharedPreferences;
import org.solovyev.common.text.Mapper;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Locale;
import java.util.StringTokenizer;

/**
 * User: serso
 * Date: 4/15/12
 * Time: 7:09 PM
 */
public class LocalePreference implements Preference {

	@Nonnull
	private final StringPreference stringPreference;

	private LocalePreference(@Nonnull String id, @Nullable Locale defaultValue, @Nonnull Mapper localeMapper) {
		this.stringPreference = new StringPreference(id, defaultValue, localeMapper);
	}

	private LocalePreference(@Nonnull String id, @Nullable Locale defaultValue) {
		this.stringPreference = new StringPreference(id, defaultValue, DefaultLocaleMapper.getInstance());
	}

	@Nonnull
	public static LocalePreference of(@Nonnull String id, @Nullable Locale defaultValue, @Nonnull Mapper localeMapper) {
		return new LocalePreference(id, defaultValue, localeMapper);
	}

	@Nonnull
	public static LocalePreference of(@Nonnull String id, @Nullable Locale defaultValue) {
		return new LocalePreference(id, defaultValue);
	}

	@Override
	@Nonnull
	public String getKey() {
		return stringPreference.getKey();
	}

	@Override
	public Locale getDefaultValue() {
		return stringPreference.getDefaultValue();
	}

	@Override
	public Locale getPreference(@Nonnull SharedPreferences preferences) {
		return stringPreference.getPreference(preferences);
	}

	@Override
	public Locale getPreferenceNoError(@Nonnull SharedPreferences preferences) {
		return stringPreference.getPreferenceNoError(preferences);
	}

	@Override
	public void putDefault(@Nonnull SharedPreferences preferences) {
		stringPreference.putDefault(preferences);
	}

	@Override
	public void putPreference(@Nonnull SharedPreferences preferences, @Nullable Locale value) {
		stringPreference.putPreference(preferences, value);
	}

	@Override
	public boolean isSet(@Nonnull SharedPreferences preferences) {
		return stringPreference.isSet(preferences);
	}

	@Override
	public boolean tryPutDefault(@Nonnull SharedPreferences preferences) {
		return stringPreference.tryPutDefault(preferences);
	}

	@Override
	public boolean isSameKey(@Nonnull String key) {
		return stringPreference.isSameKey(key);
	}

    /*
	**********************************************************************
    *
    *                           STATIC
    *
    **********************************************************************
    */

	private static final class DefaultLocaleMapper implements Mapper {

		@Nonnull
		private static final String delimiter = ";";

		@Nonnull
		private static Mapper instance = new DefaultLocaleMapper();

		private DefaultLocaleMapper() {
		}

		@Nonnull
		public static Mapper getInstance() {
			return instance;
		}

		@Override
		public String formatValue(@Nullable Locale locale) throws IllegalArgumentException {
			assert locale != null;
			return locale.getLanguage() + delimiter + locale.getCountry() + delimiter + locale.getVariant();
		}

		@Override
		public Locale parseValue(@Nullable String s) throws IllegalArgumentException {
			final StringTokenizer st = new StringTokenizer(s, delimiter, false);

			final String language = st.nextToken();

			final String country;
			if (st.hasMoreTokens()) {
				country = st.nextToken();
			} else {
				country = "";
			}

			final String variant;
			if (st.hasMoreTokens()) {
				variant = st.nextToken();
			} else {
				variant = "";
			}

			return new Locale(language, country, variant);
		}
	}
}