/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *     Copyright 2014 Couchbase, Inc.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

#ifndef LCB_CONNSPEC_H
#define LCB_CONNSPEC_H

#include <libcouchbase/couchbase.h>
#include "config.h"

#include <string>
#include <vector>
#include <set>
#include "hostlist.h"

#ifdef _MSC_VER
/*
 * Disable DLL interface warning. This isn't an issue since this API is
 * private anyway
 */
#pragma warning(push)
#pragma warning(disable : 4251)
#endif

namespace lcb {
struct Spechost {
    Spechost() : port(0), type(0) {}
    lcb_U16 port;
    short type;
    std::string hostname;
    bool isSSL() const { return type == LCB_CONFIG_MCD_SSL_PORT || type == LCB_CONFIG_HTTP_SSL_PORT; }
    bool isHTTPS() const { return type == LCB_CONFIG_HTTP_SSL_PORT; }
    bool isHTTP() const { return type == LCB_CONFIG_HTTP_PORT; }
    bool isMCD() const { return type == LCB_CONFIG_MCD_PORT; }
    bool isMCDS() const { return type == LCB_CONFIG_MCD_SSL_PORT; }
    bool isTypeless() const { return type == 0 ; }

    bool isAnyMcd() const {
        return isMCD() || isMCDS() || type == LCB_CONFIG_MCCOMPAT_PORT;
    }
    bool isAnyHttp() const {
        return isHTTP() || isHTTPS();
    }
};

#define LCB_CONNSPEC_F_FILEONLY (1<<4)

class LCB_CLASS_EXPORT Connspec {
public:
    typedef std::vector<std::pair<std::string,std::string> > Options;
    Connspec() : m_sslopts(0), m_implicit_port(0), m_loglevel(0), m_flags(0) {}

    lcb_error_t parse(const char *connstr, const char **errmsg = NULL);
    lcb_error_t load(const lcb_create_st&);

    bool has_bsmode(int mode) const {
        return m_transports.find(mode) != m_transports.end();
    }
    bool is_bs_udef() const {
        return !m_transports.empty() || (m_flags & LCB_CONNSPEC_F_FILEONLY);
    }
    bool is_bs_http() const { return has_bsmode(LCB_CONFIG_TRANSPORT_HTTP); }
    bool is_bs_cccp() const { return has_bsmode(LCB_CONFIG_TRANSPORT_CCCP); }
    bool is_bs_file() const { return m_flags & LCB_CONNSPEC_F_FILEONLY; }

    /**
     * Whether a DNS SRV lookup can be performed on this connection string.
     * @return true if a DNS SRV lookup is possible, or false if there is
     * a parameter or format of the connection string preventing a lookup
     */
    bool can_dnssrv() const;

    /**
     * Whether the explicit `couchbase{s}+dnssrv` internal scheme is used
     */
    bool is_explicit_dnssrv() const;
    uint16_t default_port() const { return m_implicit_port; }
    const std::vector<Spechost>& hosts() const { return m_hosts; }
    const std::string& bucket() const { return m_bucket; }
    const std::string& username() const { return m_username; }
    const std::string& password() const { return m_password; }
    const std::string& certpath() const { return m_certpath; }
    unsigned sslopts() const { return m_sslopts; }
    const Options& options() const { return m_ctlopts; }
    unsigned loglevel() const { return m_loglevel; }
    const std::string& connstr() const { return m_connstr; }
    void clear_hosts() { m_hosts.clear(); }
    void add_host(const Spechost& host) { m_hosts.push_back(host); }
private:
    Options m_ctlopts;
    std::string m_bucket;
    std::string m_username;
    std::string m_password;
    std::string m_certpath;
    std::string m_connstr;
    unsigned m_sslopts; /**< SSL Options */
    std::vector<Spechost> m_hosts;
    lcb_U16 m_implicit_port; /**< Implicit port, based on scheme */
    int m_loglevel; /* cached loglevel */

    inline lcb_error_t parse_options(
        const char *options, const char *optend, const char **errmsg);
    inline lcb_error_t parse_hosts(
        const char *hostbegin, const char *hostend, const char **errmsg);

    std::set<int> m_transports;
    unsigned m_flags; /**< Internal flags */
};

#define LCB_SPECSCHEME_RAW "couchbase+explicit://"
#define LCB_SPECSCHEME_MCD "couchbase://"
#define LCB_SPECSCHEME_MCD_SSL "couchbases://"
#define LCB_SPECSCHEME_HTTP "http://"
#define LCB_SPECSCHEME_HTTP_SSL "https-internal://"
#define LCB_SPECSCHEME_MCCOMPAT "memcached://"
#define LCB_SPECSCHEME_SRV "couchbase+dnssrv://"
#define LCB_SPECSCHEME_SRV_SSL "couchbases+dnssrv://"

// Standalone functionality:
lcb_error_t
dnssrv_query(const char *name, Hostlist& hostlist);

Hostlist *
dnssrv_getbslist(const char *addr, bool is_ssl, lcb_error_t& errout);

} // namespace

#endif

#ifdef _MSC_VER
#pragma warning(pop)
#endif
