/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at legal-notices/CDDLv1_0.txt.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2006-2008 Sun Microsystems, Inc.
 *      Portions copyright 2014 ForgeRock AS
 */
package com.forgerock.opendj.cli;

import static com.forgerock.opendj.cli.CliMessages.*;
import static com.forgerock.opendj.util.StaticUtils.toLowerCase;

import java.util.Iterator;
import java.util.LinkedList;

import org.forgerock.i18n.LocalizableMessage;
import org.forgerock.i18n.LocalizableMessageBuilder;

/**
 * This class defines a generic argument that may be used in the argument list
 * for an application. This is an abstract class that must be subclassed in
 * order to provide specific functionality.
 */
public abstract class Argument {
    /**
     * Indicates whether this argument should be hidden in the usage
     * information.
     */
    private boolean isHidden;

    /**
     * Indicates whether this argument may be specified more than once for
     * multiple values.
     */
    private boolean isMultiValued;

    /**
     * Indicates whether this argument was provided in the set of
     * command-line arguments.
     */
    private boolean isPresent;

    /** Indicates whether this argument is required to have a value. */
    private boolean isRequired;

    /** Indicates whether this argument requires a value. */
    private boolean needsValue;

    /** The single-character identifier for this argument. */
    private final Character shortIdentifier;

    /** The unique ID of the description for this argument. */
    private final LocalizableMessage description;

    /** The set of values for this argument. */
    private final LinkedList<String> values;

    /** The default value for the argument if none other is provided. */
    private String defaultValue;

    /** The long identifier for this argument. */
    private final String longIdentifier;

    /** The generic name that will be used to refer to this argument. */
    private final String name;

    /** The name of the property that can be used to set the default value. */
    private String propertyName;

    /**
     * The value placeholder for this argument, which will be used in
     * usage information.
     */
    private LocalizableMessage valuePlaceholder;

    /**
     * Indicates whether this argument was provided in the set of
     * properties found is a properties file.
     */
    private boolean isValueSetByProperty;

    /**
     * Creates a new argument with the provided information.
     *
     * @param name
     *            The generic name that should be used to refer to this
     *            argument.
     * @param shortIdentifier
     *            The single-character identifier for this argument, or
     *            <CODE>null</CODE> if there is none.
     * @param longIdentifier
     *            The long identifier for this argument, or <CODE>null</CODE> if
     *            there is none.
     * @param isRequired
     *            Indicates whether this argument must be specified on the
     *            command line.
     * @param isMultiValued
     *            Indicates whether this argument may be specified more than
     *            once to provide multiple values.
     * @param needsValue
     *            Indicates whether this argument requires a value.
     * @param valuePlaceholder
     *            The placeholder for the argument value that will be displayed
     *            in usage information, or <CODE>null</CODE> if this argument
     *            does not require a value.
     * @param defaultValue
     *            The default value that should be used for this argument if
     *            none is provided in a properties file or on the command line.
     *            This may be <CODE>null</CODE> if there is no generic default.
     * @param propertyName
     *            The name of the property in a property file that may be used
     *            to override the default value but will be overridden by a
     *            command-line argument.
     * @param description
     *            LocalizableMessage for the description of this argument.
     * @throws ArgumentException
     *             If there is a problem with any of the parameters used to
     *             create this argument.
     */
    protected Argument(final String name, final Character shortIdentifier,
            final String longIdentifier, final boolean isRequired, final boolean isMultiValued,
            final boolean needsValue, final LocalizableMessage valuePlaceholder,
            final String defaultValue, final String propertyName,
            final LocalizableMessage description) throws ArgumentException {
        this.name = name;
        this.shortIdentifier = shortIdentifier;
        this.longIdentifier = longIdentifier;
        this.isRequired = isRequired;
        this.isMultiValued = isMultiValued;
        this.needsValue = needsValue;
        this.valuePlaceholder = valuePlaceholder;
        this.defaultValue = defaultValue;
        this.propertyName = propertyName;
        this.description = description;
        this.isValueSetByProperty = false;

        if (shortIdentifier == null && longIdentifier == null) {
            final LocalizableMessage message = ERR_ARG_NO_IDENTIFIER.get(name);
            throw new ArgumentException(message);
        }

        if (needsValue && valuePlaceholder == null) {
            final LocalizableMessage message = ERR_ARG_NO_VALUE_PLACEHOLDER.get(name);
            throw new ArgumentException(message);
        }

        values = new LinkedList<String>();
        isPresent = false;
        isHidden = false;
    }

    /**
     * Adds a value to the set of values for this argument. This should only be
     * called if the value is allowed by the <CODE>valueIsAcceptable</CODE>
     * method.
     *
     * @param valueString
     *            The string representation of the value to add to this
     *            argument.
     */
    public void addValue(final String valueString) {
        values.add(valueString);
    }

    /**
     * Clears the set of values assigned to this argument.
     */
    public void clearValues() {
        values.clear();
    }

    /**
     * Retrieves the value of this argument as a <CODE>Boolean</CODE>.
     *
     * @return The value of this argument as a <CODE>Boolean</CODE>.
     * @throws ArgumentException
     *             If this argument cannot be interpreted as a Boolean value.
     */
    public boolean getBooleanValue() throws ArgumentException {
        if (values.isEmpty()) {
            throw new ArgumentException(ERR_ARG_NO_BOOLEAN_VALUE.get(name));
        }

        final Iterator<String> iterator = values.iterator();
        final String valueString = toLowerCase(iterator.next());
        if (iterator.hasNext()) {
            throw new ArgumentException(ERR_ARG_BOOLEAN_MULTIPLE_VALUES.get(name));
        }

        if ("true".equals(valueString) || "yes".equals(valueString)
                || "on".equals(valueString) || "1".equals(valueString)) {
            return true;
        } else if ("false".equals(valueString) || "no".equals(valueString)
                || "off".equals(valueString) || "0".equals(valueString)) {
            return false;
        } else {
            throw new ArgumentException(
                    ERR_ARG_CANNOT_DECODE_AS_BOOLEAN.get(valueString, name));
        }
    }

    /**
     * Retrieves the default value that will be used for this argument if it is
     * not specified on the command line and it is not set from a properties
     * file.
     *
     * @return The default value that will be used for this argument if it is
     *         not specified on the command line and it is not set from a
     *         properties file, or <CODE>null</CODE> if there is no default
     *         value.
     */
    public String getDefaultValue() {
        return defaultValue;
    }

    /**
     * Retrieves the human-readable description for this argument.
     *
     * @return The human-readable description for this argument.
     */
    public LocalizableMessage getDescription() {
        return description != null ? description : LocalizableMessage.EMPTY;
    }

    /**
     * Retrieves the value of this argument as an integer.
     *
     * @return The value of this argument as an integer.
     * @throws ArgumentException
     *             If there are multiple values, or the value cannot be parsed
     *             as an integer.
     */
    public double getDoubleValue() throws ArgumentException {
        if (values.isEmpty()) {
            final LocalizableMessage message = ERR_ARG_NO_INT_VALUE.get(name);
            throw new ArgumentException(message);
        }

        final Iterator<String> iterator = values.iterator();
        final String valueString = iterator.next();

        double intValue;
        try {
            intValue = Double.parseDouble(valueString);
        } catch (final Exception e) {
            final LocalizableMessage message = ERR_ARG_CANNOT_DECODE_AS_INT.get(valueString, name);
            throw new ArgumentException(message, e);
        }

        if (iterator.hasNext()) {
            final LocalizableMessage message = ERR_ARG_INT_MULTIPLE_VALUES.get(name);
            throw new ArgumentException(message);
        } else {
            return intValue;
        }
    }

    /**
     * Retrieves the set of values for this argument as a list of integers.
     *
     * @return A list of the integer representations of the values for this
     *         argument.
     * @throws ArgumentException
     *             If any of the values cannot be parsed as an integer.
     */
    public LinkedList<Double> getDoubleValues() throws ArgumentException {
        final LinkedList<Double> intList = new LinkedList<Double>();

        final Iterator<String> iterator = values.iterator();
        while (iterator.hasNext()) {
            final String valueString = iterator.next();

            try {
                intList.add(Double.valueOf(valueString));
            } catch (final Exception e) {
                final LocalizableMessage message =
                        ERR_ARG_CANNOT_DECODE_AS_INT.get(valueString, name);
                throw new ArgumentException(message, e);
            }
        }

        return intList;
    }

    /**
     * Retrieves the value of this argument as an integer.
     *
     * @return The value of this argument as an integer.
     * @throws ArgumentException
     *             If there are multiple values, or the value cannot be parsed
     *             as an integer.
     */
    public int getIntValue() throws ArgumentException {
        if (values.isEmpty()) {
            final LocalizableMessage message = ERR_ARG_NO_INT_VALUE.get(name);
            throw new ArgumentException(message);
        }

        final Iterator<String> iterator = values.iterator();
        final String valueString = iterator.next();

        int intValue;
        try {
            intValue = Integer.parseInt(valueString);
        } catch (final Exception e) {
            final LocalizableMessage message = ERR_ARG_CANNOT_DECODE_AS_INT.get(valueString, name);
            throw new ArgumentException(message, e);
        }

        if (iterator.hasNext()) {
            final LocalizableMessage message = ERR_ARG_INT_MULTIPLE_VALUES.get(name);
            throw new ArgumentException(message);
        } else {
            return intValue;
        }
    }

    /**
     * Retrieves the set of values for this argument as a list of integers.
     *
     * @return A list of the integer representations of the values for this
     *         argument.
     * @throws ArgumentException
     *             If any of the values cannot be parsed as an integer.
     */
    public LinkedList<Integer> getIntValues() throws ArgumentException {
        final LinkedList<Integer> intList = new LinkedList<Integer>();

        final Iterator<String> iterator = values.iterator();
        while (iterator.hasNext()) {
            final String valueString = iterator.next();

            try {
                intList.add(Integer.valueOf(valueString));
            } catch (final Exception e) {
                final LocalizableMessage message =
                        ERR_ARG_CANNOT_DECODE_AS_INT.get(valueString, name);
                throw new ArgumentException(message, e);
            }
        }

        return intList;
    }

    /**
     * Retrieves the long (multi-character) identifier that may be used to
     * specify the value of this argument.
     *
     * @return The long (multi-character) identifier that may be used to specify
     *         the value of this argument.
     */
    public String getLongIdentifier() {
        return longIdentifier;
    }

    /**
     * Retrieves the generic name that will be used to refer to this argument.
     *
     * @return The generic name that will be used to refer to this argument.
     */
    public String getName() {
        return name;
    }

    /**
     * Retrieves the name of a property in a properties file that may be used to
     * set the default value for this argument if it is present. A value read
     * from a properties file will override the default value returned from the
     * <CODE>getDefaultValue</CODE>, but the properties file value will be
     * overridden by a value supplied on the command line.
     *
     * @return The name of a property in a properties file that may be used to
     *         set the default value for this argument if it is present.
     */
    public String getPropertyName() {
        return propertyName;
    }

    /**
     * Retrieves the single-character identifier that may be used to specify the
     * value of this argument.
     *
     * @return The single-character identifier that may be used to specify the
     *         value of this argument, or <CODE>null</CODE> if there is none.
     */
    public Character getShortIdentifier() {
        return shortIdentifier;
    }

    /**
     * Retrieves the string vale for this argument. If it has multiple values,
     * then the first will be returned. If it does not have any values, then the
     * default value will be returned.
     *
     * @return The string value for this argument, or <CODE>null</CODE> if there
     *         are no values and no default value has been given.
     */
    public String getValue() {
        if (values.isEmpty()) {
            return defaultValue;
        }

        return values.getFirst();
    }

    /**
     * Retrieves the value placeholder that will be displayed for this argument
     * in the generated usage information.
     *
     * @return The value placeholder that will be displayed for this argument in
     *         the generated usage information, or <CODE>null</CODE> if there is
     *         none.
     */
    public LocalizableMessage getValuePlaceholder() {
        return valuePlaceholder;
    }

    /**
     * Retrieves the set of string values for this argument.
     *
     * @return The set of string values for this argument.
     */
    public LinkedList<String> getValues() {
        return values;
    }

    /**
     * Indicates whether this argument has at least one value.
     *
     * @return <CODE>true</CODE> if this argument has at least one value, or
     *         <CODE>false</CODE> if it does not have any values.
     */
    public boolean hasValue() {
        return !values.isEmpty();
    }

    /**
     * Indicates whether this argument should be hidden from the usage
     * information.
     *
     * @return <CODE>true</CODE> if this argument should be hidden from the
     *         usage information, or <CODE>false</CODE> if not.
     */
    public boolean isHidden() {
        return isHidden;
    }

    /**
     * Indicates whether this argument may be provided more than once on the
     * command line to specify multiple values.
     *
     * @return <CODE>true</CODE> if this argument may be provided more than once
     *         on the command line to specify multiple values, or
     *         <CODE>false</CODE> if it may have at most one value.
     */
    public boolean isMultiValued() {
        return isMultiValued;
    }

    /**
     * Indicates whether this argument is present in the parsed set of
     * command-line arguments.
     *
     * @return <CODE>true</CODE> if this argument is present in the parsed set
     *         of command-line arguments, or <CODE>false</CODE> if not.
     */
    public boolean isPresent() {
        return isPresent;
    }

    /**
     * Indicates whether this argument is required to have at least one value.
     *
     * @return <CODE>true</CODE> if this argument is required to have at least
     *         one value, or <CODE>false</CODE> if it does not need to have a
     *         value.
     */
    public boolean isRequired() {
        return isRequired;
    }

    /**
     * Indicates whether this argument was provided in the set of properties
     * found is a properties file.
     *
     * @return <CODE>true</CODE> if this argument was provided in the set of
     *         properties found is a properties file, or <CODE>false</CODE> if
     *         not.
     */
    public boolean isValueSetByProperty() {
        return isValueSetByProperty;
    }

    /**
     * Indicates whether a value must be provided with this argument if it is
     * present.
     *
     * @return <CODE>true</CODE> if a value must be provided with the argument
     *         if it is present, or <CODE>false</CODE> if the argument does not
     *         take a value and the presence of the argument identifier itself
     *         is sufficient to convey the necessary information.
     */
    public boolean needsValue() {
        return needsValue;
    }

    /**
     * Specifies the default value that will be used for this argument if it is
     * not specified on the command line and it is not set from a properties
     * file.
     *
     * @param defaultValue
     *            The default value that will be used for this argument if it is
     *            not specified on the command line and it is not set from a
     *            properties file.
     */
    public void setDefaultValue(final String defaultValue) {
        this.defaultValue = defaultValue;
    }

    /**
     * Specifies whether this argument should be hidden from the usage
     * information.
     *
     * @param isHidden
     *            Indicates whether this argument should be hidden from the
     *            usage information.
     */
    public void setHidden(final boolean isHidden) {
        this.isHidden = isHidden;
    }

    /**
     * Specifies whether this argument may be provided more than once on the
     * command line to specify multiple values.
     *
     * @param isMultiValued
     *            Indicates whether this argument may be provided more than once
     *            on the command line to specify multiple values.
     */
    public void setMultiValued(final boolean isMultiValued) {
        this.isMultiValued = isMultiValued;
    }

    /**
     * Specifies whether a value must be provided with this argument if it is
     * present. If this is changed from <CODE>false</CODE> to <CODE>true</CODE>,
     * then a value placeholder must also be provided.
     *
     * @param needsValue
     *            Indicates whether a value must be provided with this argument
     *            if it is present.
     */
    public void setNeedsValue(final boolean needsValue) {
        this.needsValue = needsValue;
    }

    /**
     * Specifies whether this argument is present in the parsed set of
     * command-line arguments.
     *
     * @param isPresent
     *            Indicates whether this argument is present in the set of
     *            command-line arguments.
     */
    public void setPresent(final boolean isPresent) {
        this.isPresent = isPresent;
    }

    /**
     * Specifies the name of a property in a properties file that may be used to
     * set the default value for this argument if it is present.
     *
     * @param propertyName
     *            The name of a property in a properties file that may be used
     *            to set the default value for this argument if it is present.
     */
    public void setPropertyName(final String propertyName) {
        this.propertyName = propertyName;
    }

    /**
     * Specifies whether this argument is required to have at least one value.
     *
     * @param isRequired
     *            Indicates whether this argument is required to have at least
     *            one value.
     */
    public void setRequired(final boolean isRequired) {
        this.isRequired = isRequired;
    }

    /**
     * Specifies the value placeholder that will be displayed for this argument
     * in the generated usage information. It may be <CODE>null</CODE> only if
     * <CODE>needsValue()</CODE> returns <CODE>false</CODE>.
     *
     * @param valuePlaceholder
     *            The value placeholder that will be displayed for this argument
     *            in the generated usage information.
     */
    public void setValuePlaceholder(final LocalizableMessage valuePlaceholder) {
        this.valuePlaceholder = valuePlaceholder;
    }

    /**
     * Specifies whether this argument was provided in the set of properties
     * found is a properties file.
     *
     * @param isValueSetByProperty
     *            Specify whether this argument was provided in the set of
     *            properties found is a properties file.
     */
    public void setValueSetByProperty(final boolean isValueSetByProperty) {
        this.isValueSetByProperty = isValueSetByProperty;
    }

    /**
     * Indicates whether the provided value is acceptable for use in this
     * argument.
     *
     * @param valueString
     *            The value for which to make the determination.
     * @param invalidReason
     *            A buffer into which the invalid reason may be written if the
     *            value is not acceptable.
     * @return <CODE>true</CODE> if the value is acceptable, or
     *         <CODE>false</CODE> if it is not.
     */
    public abstract boolean valueIsAcceptable(String valueString,
            LocalizableMessageBuilder invalidReason);
}