/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2017 OSSRS(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_SERVER_HPP
#define SRS_APP_SERVER_HPP

#include <srs_core.hpp>

#include <vector>
#include <string>

#include <srs_app_st.hpp>
#include <srs_app_reload.hpp>
#include <srs_app_source.hpp>
#include <srs_app_hls.hpp>
#include <srs_app_listener.hpp>
#include <srs_app_conn.hpp>

class SrsServer;
class SrsConnection;
class SrsHttpServeMux;
class SrsHttpServer;
class SrsIngester;
class SrsHttpHeartbeat;
class SrsKbps;
class SrsConfDirective;
class ISrsTcpHandler;
class ISrsUdpHandler;
class SrsUdpListener;
class SrsTcpListener;
#ifdef SRS_AUTO_STREAM_CASTER
class SrsAppCasterFlv;
#endif
#ifdef SRS_AUTO_KAFKA
class SrsKafkaProducer;
#endif

// listener type for server to identify the connection,
// that is, use different type to process the connection.
enum SrsListenerType
{
    // RTMP client,
    SrsListenerRtmpStream = 0,
    // HTTP api,
    SrsListenerHttpApi = 1,
    // HTTP stream, HDS/HLS/DASH
    SrsListenerHttpStream = 2,
    // UDP stream, MPEG-TS over udp.
    SrsListenerMpegTsOverUdp = 3,
    // TCP stream, RTSP stream.
    SrsListenerRtsp = 4,
    // TCP stream, FLV stream over HTTP.
    SrsListenerFlv = 5,
};

/**
 * the common tcp listener, for RTMP/HTTP server.
 */
class SrsListener
{
protected:
    SrsListenerType type;
protected:
    std::string ip;
    int port;
    SrsServer* server;
public:
    SrsListener(SrsServer* svr, SrsListenerType t);
    virtual ~SrsListener();
public:
    virtual SrsListenerType listen_type();
    virtual int listen(std::string i, int p) = 0;
};

/**
 * tcp listener.
 */
class SrsBufferListener : virtual public SrsListener, virtual public ISrsTcpHandler
{
private:
    SrsTcpListener* listener;
public:
    SrsBufferListener(SrsServer* server, SrsListenerType type);
    virtual ~SrsBufferListener();
public:
    virtual int listen(std::string ip, int port);
    // ISrsTcpHandler
public:
    virtual int on_tcp_client(st_netfd_t stfd);
};

#ifdef SRS_AUTO_STREAM_CASTER
/**
 * the tcp listener, for rtsp server.
 */
class SrsRtspListener : virtual public SrsListener, virtual public ISrsTcpHandler
{
private:
    SrsTcpListener* listener;
    ISrsTcpHandler* caster;
public:
    SrsRtspListener(SrsServer* svr, SrsListenerType t, SrsConfDirective* c);
    virtual ~SrsRtspListener();
public:
    virtual int listen(std::string i, int p);
    // ISrsTcpHandler
public:
    virtual int on_tcp_client(st_netfd_t stfd);
};

/**
 * the tcp listener, for flv stream server.
 */
class SrsHttpFlvListener : virtual public SrsListener, virtual public ISrsTcpHandler
{
private:
    SrsTcpListener* listener;
    SrsAppCasterFlv* caster;
public:
    SrsHttpFlvListener(SrsServer* svr, SrsListenerType t, SrsConfDirective* c);
    virtual ~SrsHttpFlvListener();
public:
    virtual int listen(std::string i, int p);
    // ISrsTcpHandler
public:
    virtual int on_tcp_client(st_netfd_t stfd);
};
#endif

/**
 * the udp listener, for udp server.
 */
class SrsUdpStreamListener : public SrsListener
{
protected:
    SrsUdpListener* listener;
    ISrsUdpHandler* caster;
public:
    SrsUdpStreamListener(SrsServer* svr, SrsListenerType t, ISrsUdpHandler* c);
    virtual ~SrsUdpStreamListener();
public:
    virtual int listen(std::string i, int p);
};

/**
 * the udp listener, for udp stream caster server.
 */
#ifdef SRS_AUTO_STREAM_CASTER
class SrsUdpCasterListener : public SrsUdpStreamListener
{
public:
    SrsUdpCasterListener(SrsServer* svr, SrsListenerType t, SrsConfDirective* c);
    virtual ~SrsUdpCasterListener();
};
#endif

/**
 * convert signal to io,
 * @see: st-1.9/docs/notes.html
 */
class SrsSignalManager : public ISrsEndlessThreadHandler
{
private:
    /* Per-process pipe which is used as a signal queue. */
    /* Up to PIPE_BUF/sizeof(int) signals can be queued up. */
    int sig_pipe[2];
    st_netfd_t signal_read_stfd;
private:
    SrsServer* _server;
    SrsEndlessThread* pthread;
public:
    SrsSignalManager(SrsServer* server);
    virtual ~SrsSignalManager();
public:
    virtual int initialize();
    virtual int start();
// interface ISrsEndlessThreadHandler.
public:
    virtual int cycle();
private:
    // global singleton instance
    static SrsSignalManager* instance;
    /* Signal catching function. */
    /* Converts signal event to I/O event. */
    static void sig_catcher(int signo);
};

/**
 * the handler to the handle cycle in SRS RTMP server.
 */
class ISrsServerCycle
{
public:
    ISrsServerCycle();
    virtual ~ISrsServerCycle();
public:
    /**
     * initialize the cycle handler.
     */
    virtual int initialize() = 0;
    /**
     * do on_cycle while server doing cycle.
     */
    virtual int on_cycle() = 0;
    /**
     * callback the handler when got client.
     */
    virtual int on_accept_client(int conf_conns, int curr_conns) = 0;
};

/**
 * SRS RTMP server, initialize and listen,
 * start connection service thread, destroy client.
 */
class SrsServer : virtual public ISrsReloadHandler
, virtual public ISrsSourceHandler
, virtual public IConnectionManager
{
private:
    // TODO: FIXME: rename to http_api
    SrsHttpServeMux* http_api_mux;
    SrsHttpServer* http_server;
    SrsHttpHeartbeat* http_heartbeat;
#ifdef SRS_AUTO_INGEST
    SrsIngester* ingester;
#endif
private:
    /**
     * the pid file fd, lock the file write when server is running.
     * @remark the init.d script should cleanup the pid file, when stop service,
     *       for the server never delete the file; when system startup, the pid in pid file
     *       maybe valid but the process is not SRS, the init.d script will never start server.
     */
    int pid_fd;
    /**
     * all connections, connection manager
     */
    std::vector<SrsConnection*> conns;
    /**
     * all listners, listener manager.
     */
    std::vector<SrsListener*> listeners;
    /**
     * signal manager which convert gignal to io message.
     */
    SrsSignalManager* signal_manager;
    /**
     * handle in server cycle.
     */
    ISrsServerCycle* handler;
    /**
     * user send the signal, convert to variable.
     */
    bool signal_reload;
    bool signal_persistence_config;
    bool signal_gmc_stop;
    bool signal_gracefully_quit;
    // parent pid for asprocess.
    int ppid;
public:
    SrsServer();
    virtual ~SrsServer();
private:
    /**
     * the destroy is for gmc to analysis the memory leak,
     * if not destroy global/static data, the gmc will warning memory leak.
     * in service, server never destroy, directly exit when restart.
     */
    virtual void destroy();
    /**
     * when SIGTERM, SRS should do cleanup, for example,
     * to stop all ingesters, cleanup HLS and dvr.
     */
    virtual void dispose();
    // server startup workflow, @see run_master()
public:
    /**
     * initialize server with callback handler.
     * @remark user must free the cycle handler.
     */
    virtual int initialize(ISrsServerCycle* cycle_handler);
    virtual int initialize_st();
    virtual int initialize_signal();
    virtual int acquire_pid_file();
    virtual int listen();
    virtual int register_signal();
    virtual int http_handle();
    virtual int ingest();
    virtual int cycle();
    // server utilities.
public:
    /**
     * callback for signal manager got a signal.
     * the signal manager convert signal to io message,
     * whatever, we will got the signo like the orignal signal(int signo) handler.
     * @param signo the signal number from user, where:
     *      SRS_SIGNAL_GRACEFULLY_QUIT, the SIGTERM, dispose then quit.
     *      SRS_SIGNAL_REOPEN_LOG, the SIGUSR1, reopen the log file.
     *      SRS_SIGNAL_RELOAD, the SIGHUP, reload the config.
     *      SRS_SIGNAL_PERSISTENCE_CONFIG, application level signal, persistence config to file.
     * @remark, for SIGINT:
     *       no gmc, directly exit.
     *       for gmc, set the variable signal_gmc_stop, the cycle will return and cleanup for gmc.
     * @remark, maybe the HTTP RAW API will trigger the on_signal() also.
     */
    virtual void on_signal(int signo);
private:
    /**
     * the server thread main cycle,
     * update the global static data, for instance, the current time,
     * the cpu/mem/network statistic.
     */
    virtual int do_cycle();
    /**
     * listen at specified protocol.
     */
    virtual int listen_rtmp();
    virtual int listen_http_api();
    virtual int listen_http_stream();
    virtual int listen_stream_caster();
    /**
     * close the listeners for specified type,
     * remove the listen object from manager.
     */
    virtual void close_listeners(SrsListenerType type);
    /**
     * resample the server kbs.
     */
    virtual void resample_kbps();
    // internal only
public:
    /**
     * when listener got a fd, notice server to accept it.
     * @param type, the client type, used to create concrete connection,
     *       for instance RTMP connection to serve client.
     * @param stfd, the client fd in st boxed, the underlayer fd.
     */
    virtual int accept_client(SrsListenerType type, st_netfd_t stfd);
private:
    virtual SrsConnection* fd2conn(SrsListenerType type, st_netfd_t stfd);
    // IConnectionManager
public:
    /**
     * callback for connection to remove itself.
     * when connection thread cycle terminated, callback this to delete connection.
     * @see SrsConnection.on_thread_stop().
     */
    virtual void remove(ISrsConnection* c);
// interface ISrsReloadHandler.
public:
    virtual int on_reload_listen();
    virtual int on_reload_pid();
    virtual int on_reload_vhost_added(std::string vhost);
    virtual int on_reload_vhost_removed(std::string vhost);
    virtual int on_reload_http_api_enabled();
    virtual int on_reload_http_api_disabled();
    virtual int on_reload_http_stream_enabled();
    virtual int on_reload_http_stream_disabled();
    virtual int on_reload_http_stream_updated();
// interface ISrsSourceHandler
public:
    virtual int on_publish(SrsSource* s, SrsRequest* r);
    virtual void on_unpublish(SrsSource* s, SrsRequest* r);
};

#endif