/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2019 Winlin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef SRS_APP_PITHY_PRINT_HPP
#define SRS_APP_PITHY_PRINT_HPP

#include <srs_core.hpp>

#include <srs_app_reload.hpp>

/**
 * the stage info to calc the age.
 */
class SrsStageInfo : public ISrsReloadHandler
{
public:
    int stage_id;
    int pithy_print_time_ms;
    int nb_clients;
public:
    int64_t age;
public:
    SrsStageInfo(int _stage_id);
    virtual ~SrsStageInfo();
    virtual void update_print_time();
public:
    virtual void elapse(int64_t diff);
    virtual bool can_print();
public:
    virtual srs_error_t on_reload_pithy_print();
};

/**
 * the stage is used for a collection of object to do print,
 * the print time in a stage is constant and not changed,
 * that is, we always got one message to print every specified time.
 *
 * for example, stage #1 for all play clients, print time is 3s,
 * if there is 1client, it will print every 3s.
 * if there is 10clients, random select one to print every 3s.
 * Usage:
 *        SrsPithyPrint* pprint = SrsPithyPrint::create_rtmp_play();
 *        SrsAutoFree(SrsPithyPrint, pprint);
 *        while (true) {
 *            pprint->elapse();
 *            if (pprint->can_print()) {
 *                // print pithy message.
 *                // user can get the elapse time by: pprint->age()
 *            }
 *            // read and write RTMP messages.
 *        }
 */
class SrsPithyPrint
{
private:
    int client_id;
    int stage_id;
    // in ms.
    int64_t _age;
    int64_t previous_tick;
private:
    SrsPithyPrint(int _stage_id);
public:
    static SrsPithyPrint* create_rtmp_play();
    static SrsPithyPrint* create_rtmp_publish();
    static SrsPithyPrint* create_hls();
    static SrsPithyPrint* create_forwarder();
    static SrsPithyPrint* create_encoder();
    static SrsPithyPrint* create_exec();
    static SrsPithyPrint* create_ingester();
    static SrsPithyPrint* create_edge();
    static SrsPithyPrint* create_caster();
    static SrsPithyPrint* create_http_stream();
    static SrsPithyPrint* create_http_stream_cache();
    virtual ~SrsPithyPrint();
private:
    /**
     * enter the specified stage, return the client id.
     */
    virtual int enter_stage();
    /**
     * leave the specified stage, release the client id.
     */
    virtual void leave_stage();
public:
    /**
     * auto calc the elapse time
     */
    virtual void elapse();
    /**
     * whether current client can print.
     */
    virtual bool can_print();
    /**
     * get the elapsed time in ms.
     */
    virtual int64_t age();
};

#endif