/* ------------------------------------------------------------------------ */
/* Copyright 2002-2024, OpenNebula Project, OpenNebula Systems              */
/*                                                                          */
/* 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 ZONE_H_
#define ZONE_H_

#include "PoolObjectSQL.h"

class ZoneServers;
class ZoneServer;

/**
 *  The Zone class.
 */
class Zone : public PoolObjectSQL
{
public:
    enum ZoneState
    {
        ENABLED  = 0, /**< Enabled */
        DISABLED = 1, /**< Disabled, only read-only commmands are executed */
    };

    /**
     *  Functions to convert to/from string the Zone states
     */
    static int str_to_state(std::string& st, ZoneState& state)
    {
        one_util::toupper(st);

        state = ENABLED;

        if ( st == "ENABLED" )
        {
            state = ENABLED;
        }
        else if ( st == "DISABLED" )
        {
            state = DISABLED;
        }
        else
        {
            return -1;
        }

        return 0;
    }

    static std::string state_to_str(ZoneState state)
    {
        std::string st = "";

        switch (state)
        {
            case ENABLED:
                st = "ENABLED";
                break;
            case DISABLED:
                st = "DISABLED";
                break;
        }

        return st;
    }

    virtual ~Zone();

    /**
     * Function to print the Zone object into a string in XML format
     *  @param xml the resulting XML string
     *  @return a reference to the generated string
     */
    std::string& to_xml(std::string& xml) const override;

    /**
     *  Rebuilds the object from an xml formatted string
     *    @param xml_str The xml-formatted string
     *
     *    @return 0 on success, -1 otherwise
     */
    int from_xml(const std::string &xml_str) override;

    /**
     *  Add servers to this zone
     *    @param tmpl with SERVER definitions
     *    @param sid id of the new sever
     *    @param xmlep endpoint of the new server
     *    @param error
     *
     *    @return 0 on success, -1 otherwise
     */
    int add_server(Template& tmpl, int& sid,
                   std::string& xmlep, std::string& error);

    /**
     *  Delete a server from this zone
     *    @param it of the SERVER
     *    @param error if any
     *
     *    @return 0 on success, -1 otherwise
     */
    int delete_server(int id, std::string& error);

    /**
     *  @return the servers in this zone
     */
    ZoneServers * get_servers()
    {
        return servers;
    }

    /**
     *  @param server_id
     *  @return the server
     */
    ZoneServer * get_server(int server_id) const;

    /**
     *  @return the number of servers in this zone
     */
    unsigned int servers_size() const;

    ZoneState get_state() const
    {
        return state;
    }

    /**
     * Enable the zone
     */
    void enable()
    {
        state = ENABLED;
    }

    /**
     * Disable the zone, only read_only commands are allowed
     */
    void disable()
    {
        state = DISABLED;
    }

private:
    // -------------------------------------------------------------------------
    // Friends
    // -------------------------------------------------------------------------
    friend class ZonePool;

    // -------------------------------------------------------------------------
    // Constructor
    // -------------------------------------------------------------------------
    Zone(int id, std::unique_ptr<Template> zone_template);

    ZoneState state;

    // -------------------------------------------------------------------------
    // Zone servers
    // -------------------------------------------------------------------------
    Template servers_template;

    ZoneServers * servers;

    // -------------------------------------------------------------------------
    // DataBase implementation (Private)
    // -------------------------------------------------------------------------

    /**
     *  Execute an INSERT or REPLACE Sql query.
     *    @param db The SQL DB
     *    @param replace Execute an INSERT or a REPLACE
     *    @param error_str Returns the error reason, if any
     *    @return 0 one success
     */
    int insert_replace(SqlDB *db, bool replace, std::string& error_str);

    /**
     *  Bootstraps the database table(s) associated to the Zone
     *    @return 0 on success
     */
    static int bootstrap(SqlDB * db);

    /**
     *  Writes the Zone in the database.
     *    @param db pointer to the db
     *    @return 0 on success
     */
    int insert(SqlDB *db, std::string& error_str) override;

    /**
     *  Writes/updates the Zone's data fields in the database.
     *    @param db pointer to the db
     *    @return 0 on success
     */
    int update(SqlDB *db) override
    {
        std::string error_str;
        return insert_replace(db, true, error_str);
    }

    /**
     *  Factory method for Zone templates
     */
    std::unique_ptr<Template> get_new_template() const override
    {
        return std::make_unique<Template>();
    }

    /**
     * Child classes can process the new template set with replace_template or
     * append_template with this method
     *    @param error string describing the error if any
     *    @return 0 on success
     */
    int post_update_template(std::string& error) override;
};

#endif /*ZONE_H_*/