//
//  ========================================================================
//  Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.http;

/**
 * <p>
 * Http Status Codes
 * </p>
 *
 * @see <a href="http://www.iana.org/assignments/http-status-codes/">IANA HTTP Status Code Registry</a>
 */
public class HttpStatus
{
    public static final int CONTINUE_100 = 100;
    public static final int SWITCHING_PROTOCOLS_101 = 101;
    public static final int PROCESSING_102 = 102;

    public static final int OK_200 = 200;
    public static final int CREATED_201 = 201;
    public static final int ACCEPTED_202 = 202;
    public static final int NON_AUTHORITATIVE_INFORMATION_203 = 203;
    public static final int NO_CONTENT_204 = 204;
    public static final int RESET_CONTENT_205 = 205;
    public static final int PARTIAL_CONTENT_206 = 206;
    public static final int MULTI_STATUS_207 = 207;

    public static final int MULTIPLE_CHOICES_300 = 300;
    public static final int MOVED_PERMANENTLY_301 = 301;
    public static final int MOVED_TEMPORARILY_302 = 302;
    public static final int FOUND_302 = 302;
    public static final int SEE_OTHER_303 = 303;
    public static final int NOT_MODIFIED_304 = 304;
    public static final int USE_PROXY_305 = 305;
    public static final int TEMPORARY_REDIRECT_307 = 307;
    public static final int PERMANENT_REDIRECT_308 = 308;

    public static final int BAD_REQUEST_400 = 400;
    public static final int UNAUTHORIZED_401 = 401;
    public static final int PAYMENT_REQUIRED_402 = 402;
    public static final int FORBIDDEN_403 = 403;
    public static final int NOT_FOUND_404 = 404;
    public static final int METHOD_NOT_ALLOWED_405 = 405;
    public static final int NOT_ACCEPTABLE_406 = 406;
    public static final int PROXY_AUTHENTICATION_REQUIRED_407 = 407;
    public static final int REQUEST_TIMEOUT_408 = 408;
    public static final int CONFLICT_409 = 409;
    public static final int GONE_410 = 410;
    public static final int LENGTH_REQUIRED_411 = 411;
    public static final int PRECONDITION_FAILED_412 = 412;
    @Deprecated
    public static final int REQUEST_ENTITY_TOO_LARGE_413 = 413;
    public static final int PAYLOAD_TOO_LARGE_413 = 413;
    @Deprecated
    public static final int REQUEST_URI_TOO_LONG_414 = 414;
    public static final int URI_TOO_LONG_414 = 414;
    public static final int UNSUPPORTED_MEDIA_TYPE_415 = 415;
    @Deprecated
    public static final int REQUESTED_RANGE_NOT_SATISFIABLE_416 = 416;
    public static final int RANGE_NOT_SATISFIABLE_416 = 416;
    public static final int EXPECTATION_FAILED_417 = 417;
    public static final int IM_A_TEAPOT_418 = 418;
    public static final int ENHANCE_YOUR_CALM_420 = 420;
    public static final int MISDIRECTED_REQUEST_421 = 421;
    public static final int UNPROCESSABLE_ENTITY_422 = 422;
    public static final int LOCKED_423 = 423;
    public static final int FAILED_DEPENDENCY_424 = 424;
    public static final int UPGRADE_REQUIRED_426 = 426;
    public static final int PRECONDITION_REQUIRED_428 = 428;
    public static final int TOO_MANY_REQUESTS_429 = 429;
    public static final int REQUEST_HEADER_FIELDS_TOO_LARGE_431 = 431;
    public static final int UNAVAILABLE_FOR_LEGAL_REASONS_451 = 451;

    public static final int INTERNAL_SERVER_ERROR_500 = 500;
    public static final int NOT_IMPLEMENTED_501 = 501;
    public static final int BAD_GATEWAY_502 = 502;
    public static final int SERVICE_UNAVAILABLE_503 = 503;
    public static final int GATEWAY_TIMEOUT_504 = 504;
    public static final int HTTP_VERSION_NOT_SUPPORTED_505 = 505;
    public static final int INSUFFICIENT_STORAGE_507 = 507;
    public static final int LOOP_DETECTED_508 = 508;
    public static final int NOT_EXTENDED_510 = 510;
    public static final int NETWORK_AUTHENTICATION_REQUIRED_511 = 511;

    public static final int MAX_CODE = 511;

    private static final Code[] codeMap = new Code[MAX_CODE + 1];

    static
    {
        for (Code code : Code.values())
        {
            codeMap[code._code] = code;
        }
    }

    public enum Code
    {
        CONTINUE(CONTINUE_100, "Continue"),
        SWITCHING_PROTOCOLS(SWITCHING_PROTOCOLS_101, "Switching Protocols"),
        PROCESSING(PROCESSING_102, "Processing"),

        OK(OK_200, "OK"),
        CREATED(CREATED_201, "Created"),
        ACCEPTED(ACCEPTED_202, "Accepted"),
        NON_AUTHORITATIVE_INFORMATION(NON_AUTHORITATIVE_INFORMATION_203, "Non Authoritative Information"),
        NO_CONTENT(NO_CONTENT_204, "No Content"),
        RESET_CONTENT(RESET_CONTENT_205, "Reset Content"),
        PARTIAL_CONTENT(PARTIAL_CONTENT_206, "Partial Content"),
        MULTI_STATUS(MULTI_STATUS_207, "Multi-Status"),

        MULTIPLE_CHOICES(MULTIPLE_CHOICES_300, "Multiple Choices"),
        MOVED_PERMANENTLY(MOVED_PERMANENTLY_301, "Moved Permanently"),
        MOVED_TEMPORARILY(MOVED_TEMPORARILY_302, "Moved Temporarily"),
        FOUND(FOUND_302, "Found"),
        SEE_OTHER(SEE_OTHER_303, "See Other"),
        NOT_MODIFIED(NOT_MODIFIED_304, "Not Modified"),
        USE_PROXY(USE_PROXY_305, "Use Proxy"),
        TEMPORARY_REDIRECT(TEMPORARY_REDIRECT_307, "Temporary Redirect"),
        // Keeping the typo for backward compatibility for a while
        PERMANET_REDIRECT(PERMANENT_REDIRECT_308, "Permanent Redirect"),
        PERMANENT_REDIRECT(PERMANENT_REDIRECT_308, "Permanent Redirect"),

        BAD_REQUEST(BAD_REQUEST_400, "Bad Request"),
        UNAUTHORIZED(UNAUTHORIZED_401, "Unauthorized"),
        PAYMENT_REQUIRED(PAYMENT_REQUIRED_402, "Payment Required"),
        FORBIDDEN(FORBIDDEN_403, "Forbidden"),
        NOT_FOUND(NOT_FOUND_404, "Not Found"),
        METHOD_NOT_ALLOWED(METHOD_NOT_ALLOWED_405, "Method Not Allowed"),
        NOT_ACCEPTABLE(NOT_ACCEPTABLE_406, "Not Acceptable"),
        PROXY_AUTHENTICATION_REQUIRED(PROXY_AUTHENTICATION_REQUIRED_407, "Proxy Authentication Required"),
        REQUEST_TIMEOUT(REQUEST_TIMEOUT_408, "Request Timeout"),
        CONFLICT(CONFLICT_409, "Conflict"),
        GONE(GONE_410, "Gone"),
        LENGTH_REQUIRED(LENGTH_REQUIRED_411, "Length Required"),
        PRECONDITION_FAILED(PRECONDITION_FAILED_412, "Precondition Failed"),
        PAYLOAD_TOO_LARGE(PAYLOAD_TOO_LARGE_413, "Payload Too Large"),
        URI_TOO_LONG(URI_TOO_LONG_414, "URI Too Long"),
        UNSUPPORTED_MEDIA_TYPE(UNSUPPORTED_MEDIA_TYPE_415, "Unsupported Media Type"),
        RANGE_NOT_SATISFIABLE(RANGE_NOT_SATISFIABLE_416, "Range Not Satisfiable"),
        EXPECTATION_FAILED(EXPECTATION_FAILED_417, "Expectation Failed"),
        IM_A_TEAPOT(IM_A_TEAPOT_418, "I'm a Teapot"),
        ENHANCE_YOUR_CALM(ENHANCE_YOUR_CALM_420, "Enhance your Calm"),
        MISDIRECTED_REQUEST(MISDIRECTED_REQUEST_421, "Misdirected Request"),
        UNPROCESSABLE_ENTITY(UNPROCESSABLE_ENTITY_422, "Unprocessable Entity"),
        LOCKED(LOCKED_423, "Locked"),
        FAILED_DEPENDENCY(FAILED_DEPENDENCY_424, "Failed Dependency"),
        UPGRADE_REQUIRED(UPGRADE_REQUIRED_426, "Upgrade Required"),
        PRECONDITION_REQUIRED(PRECONDITION_REQUIRED_428, "Precondition Required"),
        TOO_MANY_REQUESTS(TOO_MANY_REQUESTS_429, "Too Many Requests"),
        REQUEST_HEADER_FIELDS_TOO_LARGE(REQUEST_HEADER_FIELDS_TOO_LARGE_431, "Request Header Fields Too Large"),
        UNAVAILABLE_FOR_LEGAL_REASONS(UNAVAILABLE_FOR_LEGAL_REASONS_451, "Unavailable for Legal Reason"),

        INTERNAL_SERVER_ERROR(INTERNAL_SERVER_ERROR_500, "Server Error"),
        NOT_IMPLEMENTED(NOT_IMPLEMENTED_501, "Not Implemented"),
        BAD_GATEWAY(BAD_GATEWAY_502, "Bad Gateway"),
        SERVICE_UNAVAILABLE(SERVICE_UNAVAILABLE_503, "Service Unavailable"),
        GATEWAY_TIMEOUT(GATEWAY_TIMEOUT_504, "Gateway Timeout"),
        HTTP_VERSION_NOT_SUPPORTED(HTTP_VERSION_NOT_SUPPORTED_505, "HTTP Version Not Supported"),
        INSUFFICIENT_STORAGE(INSUFFICIENT_STORAGE_507, "Insufficient Storage"),
        LOOP_DETECTED(LOOP_DETECTED_508, "Loop Detected"),
        NOT_EXTENDED(NOT_EXTENDED_510, "Not Extended"),
        NETWORK_AUTHENTICATION_REQUIRED(NETWORK_AUTHENTICATION_REQUIRED_511, "Network Authentication Required"),

        ;

        private final int _code;
        private final String _message;

        Code(int code, String message)
        {
            this._code = code;
            _message = message;
        }

        public int getCode()
        {
            return _code;
        }

        public String getMessage()
        {
            return _message;
        }

        public boolean equals(int code)
        {
            return (this._code == code);
        }

        @Override
        public String toString()
        {
            return String.format("[%03d %s]", this._code, this.getMessage());
        }

        /**
         * Simple test against an code to determine if it falls into the
         * <code>Informational</code> message category as defined in the <a
         * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
         * and <a href="http://tools.ietf.org/html/rfc7231">RFC 7231 -
         * HTTP/1.1</a>.
         *
         * @return true if within range of codes that belongs to
         * <code>Informational</code> messages.
         */
        public boolean isInformational()
        {
            return HttpStatus.isInformational(this._code);
        }

        /**
         * Simple test against an code to determine if it falls into the
         * <code>Success</code> message category as defined in the <a
         * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
         * and <a href="http://tools.ietf.org/html/rfc7231">RFC 7231 -
         * HTTP/1.1</a>.
         *
         * @return true if within range of codes that belongs to
         * <code>Success</code> messages.
         */
        public boolean isSuccess()
        {
            return HttpStatus.isSuccess(this._code);
        }

        /**
         * Simple test against an code to determine if it falls into the
         * <code>Redirection</code> message category as defined in the <a
         * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
         * and <a href="http://tools.ietf.org/html/rfc7231">RFC 7231 -
         * HTTP/1.1</a>.
         *
         * @return true if within range of codes that belongs to
         * <code>Redirection</code> messages.
         */
        public boolean isRedirection()
        {
            return HttpStatus.isRedirection(this._code);
        }

        /**
         * Simple test against an code to determine if it falls into the
         * <code>Client Error</code> message category as defined in the <a
         * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
         * and <a href="http://tools.ietf.org/html/rfc7231">RFC 7231 -
         * HTTP/1.1</a>.
         *
         * @return true if within range of codes that belongs to
         * <code>Client Error</code> messages.
         */
        public boolean isClientError()
        {
            return HttpStatus.isClientError(this._code);
        }

        /**
         * Simple test against an code to determine if it falls into the
         * <code>Server Error</code> message category as defined in the <a
         * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>,
         * and <a href="http://tools.ietf.org/html/rfc7231">RFC 7231 -
         * HTTP/1.1</a>.
         *
         * @return true if within range of codes that belongs to
         * <code>Server Error</code> messages.
         */
        public boolean isServerError()
        {
            return HttpStatus.isServerError(this._code);
        }
    }

    /**
     * Get the HttpStatusCode for a specific code
     *
     * @param code the code to lookup.
     * @return the {@link HttpStatus} if found, or null if not found.
     */
    public static Code getCode(int code)
    {
        if (code <= MAX_CODE)
        {
            return codeMap[code];
        }
        return null;
    }

    /**
     * Get the status message for a specific code.
     *
     * @param code the code to look up
     * @return the specific message, or the code number itself if code
     * does not match known list.
     */
    public static String getMessage(int code)
    {
        Code codeEnum = getCode(code);
        if (codeEnum != null)
        {
            return codeEnum.getMessage();
        }
        else
        {
            return Integer.toString(code);
        }
    }

    public static boolean hasNoBody(int status)
    {
        switch (status)
        {
            case NO_CONTENT_204:
            case NOT_MODIFIED_304:
            case PARTIAL_CONTENT_206:
                return true;

            default:
                return status < OK_200;
        }
    }

    /**
     * Simple test against an code to determine if it falls into the
     * <code>Informational</code> message category as defined in the <a
     * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
     * href="http://tools.ietf.org/html/rfc7231">RFC 7231 - HTTP/1.1</a>.
     *
     * @param code the code to test.
     * @return true if within range of codes that belongs to
     * <code>Informational</code> messages.
     */
    public static boolean isInformational(int code)
    {
        return ((100 <= code) && (code <= 199));
    }

    /**
     * Simple test against an code to determine if it falls into the
     * <code>Success</code> message category as defined in the <a
     * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
     * href="http://tools.ietf.org/html/rfc7231">RFC 7231 - HTTP/1.1</a>.
     *
     * @param code the code to test.
     * @return true if within range of codes that belongs to
     * <code>Success</code> messages.
     */
    public static boolean isSuccess(int code)
    {
        return ((200 <= code) && (code <= 299));
    }

    /**
     * Simple test against an code to determine if it falls into the
     * <code>Redirection</code> message category as defined in the <a
     * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
     * href="http://tools.ietf.org/html/rfc7231">RFC 7231 - HTTP/1.1</a>.
     *
     * @param code the code to test.
     * @return true if within range of codes that belongs to
     * <code>Redirection</code> messages.
     */
    public static boolean isRedirection(int code)
    {
        return ((300 <= code) && (code <= 399));
    }

    /**
     * Simple test against an code to determine if it falls into the
     * <code>Client Error</code> message category as defined in the <a
     * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
     * href="http://tools.ietf.org/html/rfc7231">RFC 7231 - HTTP/1.1</a>.
     *
     * @param code the code to test.
     * @return true if within range of codes that belongs to
     * <code>Client Error</code> messages.
     */
    public static boolean isClientError(int code)
    {
        return ((400 <= code) && (code <= 499));
    }

    /**
     * Simple test against an code to determine if it falls into the
     * <code>Server Error</code> message category as defined in the <a
     * href="http://tools.ietf.org/html/rfc1945">RFC 1945 - HTTP/1.0</a>, and <a
     * href="http://tools.ietf.org/html/rfc7231">RFC 7231 - HTTP/1.1</a>.
     *
     * @param code the code to test.
     * @return true if within range of codes that belongs to
     * <code>Server Error</code> messages.
     */
    public static boolean isServerError(int code)
    {
        return ((500 <= code) && (code <= 599));
    }
}
