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/*
 * Copyright (c) 2010, 2020 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 org.glassfish.grizzly.http.util;

import java.util.HashMap;
import java.util.Map;

import org.glassfish.grizzly.http.HttpResponsePacket;
import org.glassfish.grizzly.memory.Buffers;
import org.glassfish.grizzly.utils.Charsets;

/**
 * This enum encapsulates the HTTP response status and reason phrases as defined by RFC 2616.
 *
 * @since 2.0
 */
@SuppressWarnings({ "UnusedDeclaration" })
public class HttpStatus {
    private static final Map statusMessages = new HashMap<>();

    public static final HttpStatus CONINTUE_100 = register(100, "Continue");
    public static final HttpStatus SWITCHING_PROTOCOLS_101 = register(101, "Switching Protocols");
    public static final HttpStatus WEB_SOCKET_PROTOCOL_HANDSHAKE_101 = register(101, "Web Socket Protocol Handshake");
    public static final HttpStatus OK_200 = register(200, "OK");
    public static final HttpStatus CREATED_201 = register(201, "Created");
    public static final HttpStatus ACCEPTED_202 = register(202, "Accepted");
    public static final HttpStatus NON_AUTHORATIVE_INFORMATION_203 = register(203, "Not-Authoritative Information");
    public static final HttpStatus NO_CONTENT_204 = register(204, "No Content");
    public static final HttpStatus RESET_CONTENT_205 = register(205, "Reset Content");
    public static final HttpStatus PARTIAL_CONTENT_206 = register(206, "Partial Content");
    public static final HttpStatus MULTIPLE_CHOICES_300 = register(300, "Multiple Choices");
    public static final HttpStatus MOVED_PERMANENTLY_301 = register(301, "Moved Permanently");
    public static final HttpStatus FOUND_302 = register(302, "Found");
    public static final HttpStatus SEE_OTHER_303 = register(303, "See Other");
    public static final HttpStatus NOT_MODIFIED_304 = register(304, "Not Modified");
    public static final HttpStatus USE_PROXY_305 = register(305, "Use Proxy");
    public static final HttpStatus TEMPORARY_REDIRECT_307 = register(307, "Temporary Redirect");
    public static final HttpStatus PERMANENT_REDIRECT_308 = register(308, "Permanent Redirect");
    public static final HttpStatus BAD_REQUEST_400 = register(400, "Bad Request");
    public static final HttpStatus UNAUTHORIZED_401 = register(401, "Unauthorized");
    public static final HttpStatus PAYMENT_REQUIRED_402 = register(402, "Payment Required");
    public static final HttpStatus FORBIDDEN_403 = register(403, "Forbidden");
    public static final HttpStatus NOT_FOUND_404 = register(404, "Not Found");
    public static final HttpStatus METHOD_NOT_ALLOWED_405 = register(405, "Method Not Allowed");
    public static final HttpStatus NOT_ACCEPTABLE_406 = register(406, "Not Acceptable");
    public static final HttpStatus PROXY_AUTHENTICATION_REQUIRED_407 = register(407, "Proxy Authentication Required");
    public static final HttpStatus REQUEST_TIMEOUT_408 = register(408, "Request Timeout");
    public static final HttpStatus CONFLICT_409 = register(409, "Conflict");
    public static final HttpStatus GONE_410 = register(410, "Gone");
    public static final HttpStatus LENGTH_REQUIRED_411 = register(411, "Length Required");
    public static final HttpStatus PRECONDITION_FAILED_412 = register(412, "Precondition Failed");
    public static final HttpStatus REQUEST_ENTITY_TOO_LARGE_413 = register(413, "Request Entity Too Large");
    public static final HttpStatus REQUEST_URI_TOO_LONG_414 = register(414, "Request-URI Too Long");
    public static final HttpStatus UNSUPPORTED_MEDIA_TYPE_415 = register(415, "Unsupported Media Type");
    public static final HttpStatus REQUEST_RANGE_NOT_SATISFIABLE_416 = register(416, "Request Range Not Satisfiable");
    public static final HttpStatus EXPECTATION_FAILED_417 = register(417, "Expectation Failed");
    public static final HttpStatus MISDIRECTED_REQUEST = register(421, "Misdirected Request");
    public static final HttpStatus REQUEST_HEADER_FIELDS_TOO_LARGE = register(431, "Request Header Fields Too Large");
    public static final HttpStatus INTERNAL_SERVER_ERROR_500 = register(500, "Internal Server Error");
    public static final HttpStatus NOT_IMPLEMENTED_501 = register(501, "Not Implemented");
    public static final HttpStatus BAD_GATEWAY_502 = register(502, "Bad Gateway");
    public static final HttpStatus SERVICE_UNAVAILABLE_503 = register(503, "Service Unavailable");
    public static final HttpStatus GATEWAY_TIMEOUT_504 = register(504, "Gateway Timeout");
    public static final HttpStatus HTTP_VERSION_NOT_SUPPORTED_505 = register(505, "HTTP Version Not Supported");

    private static HttpStatus register(final int statusCode, final String reasonPhrase) {
        final HttpStatus httpStatus = newHttpStatus(statusCode, reasonPhrase);
        statusMessages.put(statusCode, httpStatus);
        return httpStatus;
    }

    public static HttpStatus newHttpStatus(final int statusCode, final String reasonPhrase) {
        return new HttpStatus(statusCode, reasonPhrase);
    }

    /**
     * @param statusCode HTTP status code
     *
     * @return {@link HttpStatus} representation of the status.
     */
    public static HttpStatus getHttpStatus(final int statusCode) {
        HttpStatus status = statusMessages.get(statusCode);
        if (status == null) {
            status = new HttpStatus(statusCode, "CUSTOM");
        }

        return status;
    }

    // ------------------------------------------------------------ Constructors

    private final int status;
    private final String reasonPhrase;
    private final byte[] reasonPhraseBytes;
    private final byte[] statusBytes;

    private HttpStatus(final int status, final String reasonPhrase) {
        this.status = status;
        this.reasonPhrase = reasonPhrase;
        reasonPhraseBytes = reasonPhrase.getBytes(Charsets.ASCII_CHARSET);
        statusBytes = Integer.toString(status).getBytes(Charsets.ASCII_CHARSET);
    }

    // ---------------------------------------------------------- Public Methods

    /**
     * @return true if the specified int status code matches the status of this HttpStatus.
     */
    public boolean statusMatches(final int status) {
        return status == this.status;
    }

    /**
     * @return the int status code.
     */
    public int getStatusCode() {
        return status;
    }

    public byte[] getStatusBytes() {
        return statusBytes;
    }

    /**
     * @return the {@link String} representation of the reason phrase.
     */
    public String getReasonPhrase() {
        return reasonPhrase;
    }

    /**
     * @return the bytes containing the reason phrase as defined by RFC 2616.
     */
    public byte[] getReasonPhraseBytes() {
        return reasonPhraseBytes;
    }

    /**
     * Sets the status and reason phrase on the specified response.
     * 
     * @param response the response to set the status and reason phrase on.
     */
    public void setValues(final HttpResponsePacket response) {
        response.setStatus(this);
        response.setReasonPhrase(Buffers.wrap(null, reasonPhraseBytes));
    }
}