//
// Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef BEAST_HTTP_VERB_HPP
#define BEAST_HTTP_VERB_HPP

#include <beast/config.hpp>
#include <beast/core/string_view.hpp>
#include <boost/optional.hpp>
#include <ostream>

namespace beast {
namespace http {

/** HTTP request method verbs

    Each verb corresponds to a particular method string
    used in HTTP request messages.
*/
enum class verb
{
    /// The DELETE method deletes the specified resource
    delete_ = 1,

    /** The GET method requests a representation of the specified resource.

        Requests using GET should only retrieve data and should have no other effect.
    */
    get,

    /** The HEAD method asks for a response identical to that of a GET request, but without the response body.
    
        This is useful for retrieving meta-information written in response
        headers, without having to transport the entire content.
    */
    head,

    /** The POST method requests that the server accept the entity enclosed in the request as a new subordinate of the web resource identified by the URI.

        The data POSTed might be, for example, an annotation for existing
        resources; a message for a bulletin board, newsgroup, mailing list,
        or comment thread; a block of data that is the result of submitting
        a web form to a data-handling process; or an item to add to a database
    */
    post,

    /** The PUT method requests that the enclosed entity be stored under the supplied URI.

        If the URI refers to an already existing resource, it is modified;
        if the URI does not point to an existing resource, then the server
        can create the resource with that URI.
    */
    put,

    /** The CONNECT method converts the request connection to a transparent TCP/IP tunnel.

        This is usually to facilitate SSL-encrypted communication (HTTPS)
        through an unencrypted HTTP proxy.
    */
    connect,

    /** The OPTIONS method returns the HTTP methods that the server supports for the specified URL.
    
        This can be used to check the functionality of a web server by requesting
        '*' instead of a specific resource.
    */
    options,

    /** The TRACE method echoes the received request so that a client can see what (if any) changes or additions have been made by intermediate servers.
    */
    trace,

    // WebDAV

    copy,
    lock,
    mkcol,
    move,
    propfind,
    proppatch,
    search,
    unlock,
    bind,
    rebind,
    unbind,
    acl,

    // subversion

    report,
    mkactivity,
    checkout,
    merge,

    // upnp

    msearch,
    notify,
    subscribe,
    unsubscribe,

    // RFC-5789

    patch,
    purge,

    // CalDAV

    mkcalendar,

    // RFC-2068, section 19.6.1.2

    link,
    unlink
};

/** Converts a string to the request method verb.

    If the string does not match a known request method,
    `boost::none` is returned.
*/
boost::optional<verb>
string_to_verb(string_view s);

/// Returns the text representation of a request method verb.
string_view
to_string(verb v);

/// Write the text for a request method verb to an output stream.
inline
std::ostream&
operator<<(std::ostream& os, verb v)
{
    return os << to_string(v);
}

} // http
} // beast

#include <beast/http/impl/verb.ipp>

#endif