/*
 * Copyright (C) 2010 Google Inc.
 *
 * 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.
 */

package com.android.i18n.addressinput;

/**
 * A simple class to hold region data. Instances of this class are immutable.
 */
class RegionData {

    private String mKey;
    private String mName;

    /**
     * Create a new RegionData object.
     */
    private RegionData() {
    }

    /**
     * Copy constructor. data should not be null.
     *
     * @param data A populated instance of RegionData
     */
    private RegionData(RegionData data) {
        Util.checkNotNull(data);
        mKey = data.mKey;
        mName = data.mName;
    }

    /**
     * Gets the key of the region. For example, California's key is "CA".
     */
    String getKey() {
        return mKey;
    }

    /**
     * Gets the name. Returns null if not specified.
     */
    String getName() {
        return mName;
    }

    /**
     * Gets the best display name. Returns the name if this is not null, otherwise the key.
     */
    public String getDisplayName() {
        return (mName != null) ? mName : mKey;
    }

    /**
     * Checks if the input subkey is the name (in Latin or local script) of the region. Returns
     * false if subkey is not a valid name for the region, or the input subkey is null.
     *
     * @param subkey a string that refers to the name of a geo location. Like "California", "CA", or
     *               "Mountain View". Names in the local script are also supported.
     */
    boolean isValidName(String subkey) {
        if (subkey == null) {
            return false;
        }
        if (subkey.equalsIgnoreCase(mKey) || subkey.equalsIgnoreCase(mName)) {
            return true;
        }
        return false;
    }

    /**
     * A builder class to facilitate the creation of RegionData objects.
     */
    static class Builder {
        RegionData mData = new RegionData();

        RegionData build() {
            return new RegionData(mData);
        }

        Builder setKey(String key) {
            Util.checkNotNull(key, "Key should not be null.");
            mData.mKey = key;
            return this;
        }

        /**
         * Sets name of the region. For example, "California". If the name is an empty string, sets
         * it to null.
         */
        Builder setName(String name) {
            mData.mName = Util.trimToNull(name);
            return this;
        }
    }
}