/*
The MIT License (MIT)

Copyright (c) 2013-2015 SRS(simple-rtmp-server)
Copyright (c) 2013-2015 SRS(simple-rtmp-server)

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_BANDWIDTH_HPP
#define SRS_APP_BANDWIDTH_HPP

/*
#include <srs_app_bandwidth.hpp>
*/
#include <srs_core.hpp>

#include <string>

#include <srs_app_st.hpp>

class SrsKbps;
class SrsRequest;
class SrsRtmpServer;
class SrsKbpsLimit;
class ISrsProtocolStatistic;

/**
* bandwidth check/test sample.
*/
class SrsBandwidthSample
{
public:
    /**
    * the plan, how long to do the test, in ms,
    * if exceed the duration, abort the test.
    */
    int duration_ms;
    /**
    * the plan, interval for each check/test packet, in ms
    */
    int interval_ms;
public:
    /**
    * the actual test duration, in ms.
    */
    int actual_duration_ms;
    /**
    * the actual test bytes
    */
    int bytes;
    /**
    * the actual test kbps
    */
    int kbps;
public:
    SrsBandwidthSample();
    virtual ~SrsBandwidthSample();
public:
    /**
    * update the bytes and actual duration, then calc the kbps.
    * @param _bytes update the sample bytes.
    * @param _duration update the actual duration, in ms.
    */
    virtual void calc_kbps(int _bytes, int _duration);
};

/**
* bandwidth test agent which provides the interfaces for bandwidth check.
* 1. if vhost disabled bandwidth check, ignore.
* 2. otherwise, check the key, error if verify failed.
* 3. check the interval limit, error if bandwidth in the interval window.
* 4. check the bandwidth under the max kbps.
* 5. send the bandwidth data to client.
* bandwidth workflow:
*  +------------+             +----------+
*  |  Client    |             |  Server  |
*  +-----+------+             +-----+----+
*        |                          |
*        |  connect vhost------>    | if vhost enable bandwidth,
*        |  <-----result(success)   | do bandwidth check.
*        |                          |
*        |  <----call(start play)   | onSrsBandCheckStartPlayBytes
*        |  result(playing)----->   | onSrsBandCheckStartingPlayBytes
*        |  <-------data(playing)   | onSrsBandCheckStartingPlayBytes
*        |  <-----call(stop play)   | onSrsBandCheckStopPlayBytes
*        |  result(stopped)----->   | onSrsBandCheckStoppedPlayBytes
*        |                          |
*        |  <-call(start publish)   | onSrsBandCheckStartPublishBytes
*        |  result(publishing)-->   | onSrsBandCheckStartingPublishBytes
*        |  data(publishing)(3)->   | onSrsBandCheckStartingPublishBytes
*        |  <--call(stop publish)   | onSrsBandCheckStopPublishBytes
*        |  result(stopped)(1)-->   | onSrsBandCheckStoppedPublishBytes
*        |                          |
*        |  <--------------report   |
*        |  final(2)------------>   | finalClientPacket
*        |          <END>           |
*
* 1. when flash client, server never wait the stop publish response,
*   for the flash client queue is fullfill with other packets.
* 2. when flash client, server never wait the final packet,
*   for the flash client directly close when got report packet.
* 3. for linux client, it will send the publish data then send a stop publish,
*   for the linux client donot know when to stop the publish.
*   when server got publishing and stop publish, stop publish.
*/
class SrsBandwidth
{
private:
    SrsRequest* _req;
    SrsRtmpServer* _rtmp;
public:
    SrsBandwidth();
    virtual ~SrsBandwidth();
public:
    /**
    * do the bandwidth check.
    * @param rtmp, server RTMP protocol object, send/recv RTMP packet to/from client.
    * @param io_stat, the underlayer io statistic, provides send/recv bytes count.
    * @param req, client request object, specifies the request info from client.
    * @param local_ip, the ip of server which client connected at
    */
    virtual int bandwidth_check(SrsRtmpServer* rtmp, ISrsProtocolStatistic* io_stat, SrsRequest* req, std::string local_ip);
private:
    /**
    * used to process band width check from client.
    * @param limit, the bandwidth limit object, to slowdown if exceed the kbps.
    */
    virtual int do_bandwidth_check(SrsKbpsLimit* limit);
// play check/test, downloading bandwidth kbps.
private:
    /**
    * start play/download bandwidth check/test,
    * send start-play command to client, client must response starting-play
    * to start the test.
    */
    virtual int play_start(SrsBandwidthSample* sample, SrsKbpsLimit* limit);
    /**
    * do play/download bandwidth check/test,
    * server send call messages to client in specified time,
    * calc the time and bytes sent, then we got the kbps.
    */
    virtual int play_checking(SrsBandwidthSample* sample, SrsKbpsLimit* limit);
    /**
    * stop play/download bandwidth check/test,
    * send stop-play command to client, client must response stopped-play
    * to stop the test.
    */
    virtual int play_stop(SrsBandwidthSample* sample, SrsKbpsLimit* limit);
// publish check/test, publishing bandwidth kbps.
private:
    /**
    * start publish/upload bandwidth check/test,
    * send start-publish command to client, client must response starting-publish
    * to start the test.
    */
    virtual int publish_start(SrsBandwidthSample* sample, SrsKbpsLimit* limit);
    /**
    * do publish/upload bandwidth check/test,
    * client send call messages to client in specified time,
    * server calc the time and bytes received, then we got the kbps.
    * @remark, for linux client, it will send a stop publish client, server will stop publishing.
    *       then enter the publish-stop stage with client.
    * @remark, for flash client, it will send many many call messages, that is,
    *       the send queue is fullfill with call messages, so we should never expect the 
    *       response message in the publish-stop stage.
    */
    virtual int publish_checking(SrsBandwidthSample* sample, SrsKbpsLimit* limit);
    /**
    * stop publish/upload bandwidth check/test,
    * send stop-publish command to client, 
    * for linux client, always expect a stopped-publish response from client,
    * for flash client, the sent queue is fullfill with publishing call messages, 
    *       so server never expect the stopped-publish from it.
    */
    virtual int publish_stop(SrsBandwidthSample* sample, SrsKbpsLimit* limit);
private:
    /**
    * report and final packet
    * report a finish packet, with the bytes/time/kbps bandwidth check/test result,
    * for linux client, server always expect a final packet from client,
    * for flash client, the sent queue is fullfill with publishing call messages, 
    *       so server never expect the final packet from it.
    */
    virtual int finial(SrsBandwidthSample& play_sample, SrsBandwidthSample& publish_sample, int64_t start_time, int64_t& end_time);
};

/**
 * the kbps limit, if exceed the kbps, slow down.
 */
class SrsKbpsLimit
{
private:
    int _limit_kbps;
    SrsKbps* _kbps;
public:
    SrsKbpsLimit(SrsKbps* kbps, int limit_kbps);
    virtual ~SrsKbpsLimit();
public:
    /**
     * get the system limit kbps.
     */
    virtual int limit_kbps();
    /**
     * limit the recv bandwidth.
     */
    virtual void recv_limit();
    /**
     * limit the send bandwidth.
     */
    virtual void send_limit();
};

#endif
