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/*
 * Copyright (c) 2008-2022 The Aspectran Project
 *
 * 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.aspectran.shell.command.option;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * Main entry-point into the library.
 *
 * 
Options represents a collection of {@link Option} objects, which
 * describe the possible options for a command-line.

 *
 * 
It may flexibly parse long and short options, with or without
 * values.  Additionally, it may parse only a portion of a commandline,
 * allowing for flexible multi-stage parsing.

 *
 * @see ParsedOptions
 */
public class Options implements Serializable {

    private static final long serialVersionUID = -6416293453155205092L;

    /** A map of the options with the character key */
    private final Map shortOpts = new LinkedHashMap<>();

    /** A map of the options with the long key */
    private final Map longOpts = new LinkedHashMap<>();

    /** A map of the required options */
    private final List requiredOpts = new ArrayList<>();

    /** A map of the option groups */
    private final Map optionGroups = new LinkedHashMap<>();

    private String title = "Options:";

    private boolean skipParsingAtNonOption;

    public Options() {
        this(false);
    }

    public Options(boolean skipParsingAtNonOption) {
        this.skipParsingAtNonOption = skipParsingAtNonOption;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public boolean isSkipParsingAtNonOption() {
        return skipParsingAtNonOption;
    }

    public void setSkipParsingAtNonOption(boolean skipParsingAtNonOption) {
        this.skipParsingAtNonOption = skipParsingAtNonOption;
    }

    /**
     * Add the specified option group.
     * @param group the OptionGroup that is to be added
     * @return the resulting Options instance
     */
    public Options addOptionGroup(OptionGroup group) {
        if (group.isRequired()) {
            requiredOpts.add(group);
        }
        for (Option option : group.getOptions()) {
            // an Option cannot be required if it is in an
            // OptionGroup, either the group is required or
            // nothing is required
            option.setRequired(false);
            addOption(option);
            optionGroups.put(option.getKey(), group);
        }
        return this;
    }

    /**
     * Lists the OptionGroups that are members of this Options instance.
     * @return a Collection of OptionGroup instances
     */
    Collection getOptionGroups() {
        return new HashSet<>(optionGroups.values());
    }

    /**
     * Adds an option instance.
     * @param opt the option that is to be added
     * @return the resulting Options instance
     */
    public Options addOption(Option opt) {
        String key = opt.getKey();

        // add it to the long option list
        if (opt.hasLongName()) {
            longOpts.put(opt.getLongName(), opt);
        }

        // if the option is required add it to the required list
        if (opt.isRequired()) {
            if (requiredOpts.contains(key)) {
                requiredOpts.remove(requiredOpts.indexOf(key));
            }
            requiredOpts.add(key);
        }

        shortOpts.put(key, opt);
        return this;
    }

    /**
     * Returns {@code true} if no options have been added.
     * @return {@code true} if no options have been added
     */
    public boolean isEmpty() {
        return shortOpts.isEmpty();
    }

    /**
     * Retrieve a read-only list of options in this set.
     * @return read-only Collection of {@link Option} objects in this descriptor
     */
    public Collection