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/*
 * Copyright (c) 2010-2018 Nathan Rajlich
 *
 *  Permission is hereby granted, free of charge, to any person
 *  obtaining a copy of this software and associated documentation
 *  files (the "Software"), to deal in the Software without
 *  restriction, including without limitation the rights to use,
 *  copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following
 *  conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *  OTHER DEALINGS IN THE SOFTWARE.
 */

package com.alipay.api.java_websocket.protocols;

import java.util.regex.Pattern;

/**
 * Class which represents the protocol used as Sec-WebSocket-Protocol
 *
 * @since 1.3.7
 */
public class Protocol implements IProtocol {

    private static final Pattern patternSpace = Pattern.compile(" ");
    private static final Pattern patternComma = Pattern.compile(",");

    /**
     * Attribute for the provided protocol
     */
    private final String providedProtocol;

    /**
     * Constructor for a Sec-Websocket-Protocol
     *
     * @param providedProtocol the protocol string
     */
    public Protocol(String providedProtocol) {
        if (providedProtocol == null) {
            throw new IllegalArgumentException();
        }
        this.providedProtocol = providedProtocol;
    }

    public boolean acceptProvidedProtocol(String inputProtocolHeader) {
        String protocolHeader = patternSpace.matcher(inputProtocolHeader).replaceAll("");
        String[] headers = patternComma.split(protocolHeader);
        for (String header : headers) {
            if (providedProtocol.equals(header)) {
                return true;
            }
        }
        return false;
    }

    public String getProvidedProtocol() {
        return this.providedProtocol;
    }

    public IProtocol copyInstance() {
        return new Protocol(getProvidedProtocol());
    }

    public String toString() {
        return getProvidedProtocol();
    }

    public boolean equals(Object o) {
        if (this == o) { return true; }
        if (o == null || getClass() != o.getClass()) { return false; }

        Protocol protocol = (Protocol) o;

        return providedProtocol.equals(protocol.providedProtocol);
    }

    public int hashCode() {
        return providedProtocol.hashCode();
    }
}