/*
 * Copyright (c) 1997, 2023 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.mail.search;

import jakarta.mail.Flags;
import jakarta.mail.Message;
import jakarta.mail.MessagingException;

/**
 * This class implements comparisons for Message Flags.
 *
 * @author Bill Shannon
 * @author John Mani
 */
public final class FlagTerm extends SearchTerm {

    /**
     * Indicates whether to test for the presence or
     * absence of the specified Flag. If <code>true</code>,
     * then test whether all the specified flags are present, else
     * test whether all the specified flags are absent.
     *
     * @serial
     */
    private boolean set;

    /**
     * Flags object containing the flags to test.
     *
     * @serial
     */
    private Flags flags;

    private static final long serialVersionUID = -142991500302030647L;

    /**
     * Constructor.
     *
     * @param flags Flags object containing the flags to check for
     * @param set   the flag setting to check for
     */
    public FlagTerm(Flags flags, boolean set) {
        this.flags = flags;
        this.set = set;
    }

    /**
     * Return the Flags to test.
     *
     * @return the flags
     */
    public Flags getFlags() {
        return (Flags) flags.clone();
    }

    /**
     * Return true if testing whether the flags are set.
     *
     * @return true if testing whether the flags are set
     */
    public boolean getTestSet() {
        return set;
    }

    /**
     * The comparison method.
     *
     * @param msg The flag comparison is applied to this Message
     * @return true if the comparson succeeds, otherwise false.
     */
    @Override
    public boolean match(Message msg) {

        try {
            Flags f = msg.getFlags();
            if (set) { // This is easy
                if (f.contains(flags))
                    return true;
                else
                    return false;
            }

            // Return true if ALL flags in the passed in Flags
            // object are NOT set in this Message.

            // Got to do this the hard way ...
            Flags.Flag[] sf = flags.getSystemFlags();

            // Check each flag in the passed in Flags object
            for (int i = 0; i < sf.length; i++) {
                if (f.contains(sf[i]))
                    // this flag IS set in this Message, get out.
                    return false;
            }

            String[] s = flags.getUserFlags();

            // Check each flag in the passed in Flags object
            for (int i = 0; i < s.length; i++) {
                if (f.contains(s[i]))
                    // this flag IS set in this Message, get out.
                    return false;
            }

            return true;

        } catch (MessagingException | RuntimeException e) {
            return false;
        }
    }

    /**
     * Equality comparison.
     */
    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof FlagTerm))
            return false;
        FlagTerm ft = (FlagTerm) obj;
        return ft.set == this.set && ft.flags.equals(this.flags);
    }

    /**
     * Compute a hashCode for this object.
     */
    @Override
    public int hashCode() {
        return set ? flags.hashCode() : ~flags.hashCode();
    }
}
