/*

 * Copyright (C) 2011, 2013-2021 The JavaParser Team.

 *

 * This file is part of JavaParser.

 *

 * JavaParser can be used either under the terms of

 * a) the GNU Lesser General Public License as published by

 *     the Free Software Foundation, either version 3 of the License, or

 *     (at your option) any later version.

 * b) the terms of the Apache License

 *

 * You should have received a copy of both licenses in LICENCE.LGPL and

 * LICENCE.APACHE. Please refer to those files for details.

 *

 * JavaParser 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 Lesser General Public License for more details.

 */

package com.github.javaparser.printer.configuration;

import com.github.javaparser.printer.configuration.DefaultPrinterConfiguration.ConfigOption;

import com.github.javaparser.utils.Utils;

/*

 * An option is a pair of ConfigOption and a currentValue

 */

public class DefaultConfigurationOption implements ConfigurationOption {

    ConfigOption configOption;

    Object currentValue;

    public DefaultConfigurationOption(ConfigOption configOption) {

        this(configOption, null);

    }

    public DefaultConfigurationOption(ConfigOption configOption, Object value) {

        this.configOption = configOption;

        if (value != null)

            value(value);

    }

    @Override

    public boolean equals(Object o) {

        if (o == null || !(o instanceof DefaultConfigurationOption)) return false;

        DefaultConfigurationOption other = (DefaultConfigurationOption) o;

        return configOption.equals(other.configOption);

    }

    @Override

    public int hashCode() {

        return configOption.hashCode();

    }

    /**

     * Set a currentValue to an option

     */

    @Override

    public ConfigurationOption value(Object value) {

        Utils.assertNotNull(value);

        this.currentValue = value;

        // verify the currentValue's type

        if (!(configOption.type.isAssignableFrom(value.getClass()))) {

            throw new IllegalArgumentException(

                    String.format("%s is not an instance of %s", value, configOption.type.getName()));

        }

        return this;

    }

    /**

     * returns True if the option has a currentValue

     */

    @Override

    public boolean hasValue() {

        return this.currentValue != null;

    }

    /**

     * returns the currentValue as an Integer

     */

    @Override

    public Integer asInteger() {

        return cast();

    }

    /**

     * returns the currentValue as a String

     */

    @Override

    public String asString() {

        return cast();

    }

    /**

     * returns the currentValue as a Boolean

     */

    @Override

    public Boolean asBoolean() {

        return cast();

    }

    @Override

    public <T extends Object> T asValue() {

        return cast();

    }

    private <T extends Object> T cast() {

        if (!hasValue())

            throw new IllegalArgumentException(String.format("The option %s has no currentValue", configOption.name()));

        if (configOption.type.isAssignableFrom(currentValue.getClass()))

            return (T) configOption.type.cast(currentValue);

        throw new IllegalArgumentException(

                String.format("%s cannot be cast to %s", currentValue, configOption.type.getName()));

    }

}