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 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package jdk.jpackager.internal;

import java.util.*;
import java.util.function.BiFunction;
import java.util.function.Function;

/**
 * EnumeratedBundlerParams<T>
 *
 * Contains key-value pairs (elements) where keys are "displayable"
 * keys which the IDE can display/choose and values are "identifier" values
 * which can be stored in parameters' map.
 *
 * For instance the Mac has a predefined set of categories which can be applied
 * to LSApplicationCategoryType which is required for the mac app store.
 *
 * The following example illustrates a simple usage of
 *     the MAC_CATEGORY parameter:
 *
 * <pre>{@code
 *     Set<String> keys = MAC_CATEGORY.getDisplayableKeys();
 *
 *     String key = getLastValue(keys); // get last value for example
 *
 *     String value = MAC_CATEGORY.getValueForDisplayableKey(key);
 *     params.put(MAC_CATEGORY.getID(), value);
 * }</pre>
 *
 */
public class EnumeratedBundlerParam<T> extends BundlerParamInfo<T> {
    // Not sure if this is the correct order, my idea is that from IDE
    // perspective the string to display to the user is the key and then the
    // value is some type of object (although probably a String in most cases)
    private final Map<String, T> elements;
    private final boolean strict;

    public EnumeratedBundlerParam(String name, String description,
            String id, Class<T> valueType,
            Function<Map<String, ? super Object>, T> defaultValueFunction,
            BiFunction<String, Map<String, ? super Object>, T> stringConverter,
            Map<String, T> elements, boolean strict) {
        this.name = name;
        this.description = description;
        this.id = id;
        this.valueType = valueType;
        this.defaultValueFunction = defaultValueFunction;
        this.stringConverter = stringConverter;
        this.elements = elements;
        this.strict = strict;
    }

    public boolean isInPossibleValues(T value) {
        return elements.values().contains(value);
    }

    // Having the displayable values as the keys seems a bit wacky
    public Set<String> getDisplayableKeys() {
        return Collections.unmodifiableSet(elements.keySet());
    }

    // mapping from a "displayable" key to an "identifier" value.
    public T getValueForDisplayableKey(String displayableKey) {
        return elements.get(displayableKey);
    }

    public boolean isStrict() {
        return strict;
    }

    public boolean isLoose() {
        return !isStrict();
    }

    public T validatedFetchFrom(Map<String, ? super Object> params)
            throws InvalidBundlerParamException {
        if (isStrict()) {
            T value = fetchFrom(params);
            if (!isInPossibleValues(value)) {
                throw new InvalidBundlerParamException("Parameter "
                        + value.toString()
                        + " not in valid set of values for BundlerParam "
                        + name);
            }
            return value;
        }
        return fetchFrom(params);
    }

}