//
// Copyright (c) 2013-2024 The SRS Authors
//
// SPDX-License-Identifier: MIT
//

#ifndef SRS_APP_HTTP_STREAM_HPP
#define SRS_APP_HTTP_STREAM_HPP

#include <srs_core.hpp>
#include <srs_app_security.hpp>
#include <srs_app_http_conn.hpp>
#include <srs_app_async_call.hpp>

#include <vector>

class SrsAacTransmuxer;
class SrsMp3Transmuxer;
class SrsFlvTransmuxer;
class SrsTsTransmuxer;
class SrsAsyncCallWorker;

// A cache for HTTP Live Streaming encoder, to make android(weixin) happy.
class SrsBufferCache : public ISrsCoroutineHandler
{
private:
    srs_utime_t fast_cache;
    SrsServer* server_;
private:
    SrsMessageQueue* queue;
    SrsRequest* req;
    SrsCoroutine* trd;
public:
    SrsBufferCache(SrsServer* s, SrsRequest* r);
    virtual ~SrsBufferCache();
    virtual srs_error_t update_auth(SrsRequest* r);
public:
    virtual srs_error_t start();
    virtual void stop();
    virtual bool alive();
    virtual srs_error_t dump_cache(SrsLiveConsumer* consumer, SrsRtmpJitterAlgorithm jitter);
// Interface ISrsEndlessThreadHandler.
public:
    virtual srs_error_t cycle();
};

// The encoder to transmux RTMP stream.
class ISrsBufferEncoder
{
public:
    ISrsBufferEncoder();
    virtual ~ISrsBufferEncoder();
public:
    // Initialize the encoder with file writer(to http response) and stream cache.
    // @param w the writer to write to http response.
    // @param c the stream cache for audio stream fast startup.
    virtual srs_error_t initialize(SrsFileWriter* w, SrsBufferCache* c) = 0;
    // Write rtmp video/audio/metadata.
    virtual srs_error_t write_audio(int64_t timestamp, char* data, int size) = 0;
    virtual srs_error_t write_video(int64_t timestamp, char* data, int size) = 0;
    virtual srs_error_t write_metadata(int64_t timestamp, char* data, int size) = 0;
public:
    // For some stream, for example, mp3 and aac, the audio stream,
    // we use large gop cache in encoder, for the gop cache of SrsLiveSource is ignore audio.
    // @return true to use gop cache of encoder; otherwise, use SrsLiveSource.
    virtual bool has_cache() = 0;
    // Dumps the cache of encoder to consumer.
    virtual srs_error_t dump_cache(SrsLiveConsumer* consumer, SrsRtmpJitterAlgorithm jitter) = 0;
};

// Transmux RTMP to HTTP Live Streaming.
class SrsFlvStreamEncoder : public ISrsBufferEncoder
{
private:
    SrsFlvTransmuxer* enc;
    bool header_written;
    bool has_audio_;
    bool has_video_;
    bool guess_has_av_;
public:
    SrsFlvStreamEncoder();
    virtual ~SrsFlvStreamEncoder();
public:
    virtual srs_error_t initialize(SrsFileWriter* w, SrsBufferCache* c);
    virtual srs_error_t write_audio(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_video(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_metadata(int64_t timestamp, char* data, int size);
public:
    void set_drop_if_not_match(bool v);
    void set_has_audio(bool v);
    void set_has_video(bool v);
    void set_guess_has_av(bool v);
public:
    virtual bool has_cache();
    virtual srs_error_t dump_cache(SrsLiveConsumer* consumer, SrsRtmpJitterAlgorithm jitter);
public:
    // Write the tags in a time.
    virtual srs_error_t write_tags(SrsSharedPtrMessage** msgs, int count);
private:
    virtual srs_error_t write_header(bool has_video, bool has_audio);
};

// Transmux RTMP to HTTP TS Streaming.
class SrsTsStreamEncoder : public ISrsBufferEncoder
{
private:
    SrsTsTransmuxer* enc;
public:
    SrsTsStreamEncoder();
    virtual ~SrsTsStreamEncoder();
public:
    virtual srs_error_t initialize(SrsFileWriter* w, SrsBufferCache* c);
    virtual srs_error_t write_audio(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_video(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_metadata(int64_t timestamp, char* data, int size);
public:
    virtual bool has_cache();
    virtual srs_error_t dump_cache(SrsLiveConsumer* consumer, SrsRtmpJitterAlgorithm jitter);
public:
    void set_has_audio(bool v);
    void set_has_video(bool v);
    void set_guess_has_av(bool v);
};

// Transmux RTMP with AAC stream to HTTP AAC Streaming.
class SrsAacStreamEncoder : public ISrsBufferEncoder
{
private:
    SrsAacTransmuxer* enc;
    SrsBufferCache* cache;
public:
    SrsAacStreamEncoder();
    virtual ~SrsAacStreamEncoder();
public:
    virtual srs_error_t initialize(SrsFileWriter* w, SrsBufferCache* c);
    virtual srs_error_t write_audio(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_video(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_metadata(int64_t timestamp, char* data, int size);
public:
    virtual bool has_cache();
    virtual srs_error_t dump_cache(SrsLiveConsumer* consumer, SrsRtmpJitterAlgorithm jitter);
};

// Transmux RTMP with MP3 stream to HTTP MP3 Streaming.
class SrsMp3StreamEncoder : public ISrsBufferEncoder
{
private:
    SrsMp3Transmuxer* enc;
    SrsBufferCache* cache;
public:
    SrsMp3StreamEncoder();
    virtual ~SrsMp3StreamEncoder();
public:
    virtual srs_error_t initialize(SrsFileWriter* w, SrsBufferCache* c);
    virtual srs_error_t write_audio(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_video(int64_t timestamp, char* data, int size);
    virtual srs_error_t write_metadata(int64_t timestamp, char* data, int size);
public:
    virtual bool has_cache();
    virtual srs_error_t dump_cache(SrsLiveConsumer* consumer, SrsRtmpJitterAlgorithm jitter);
};

// Write stream to http response direclty.
class SrsBufferWriter : public SrsFileWriter
{
private:
    ISrsHttpResponseWriter* writer;
public:
    SrsBufferWriter(ISrsHttpResponseWriter* w);
    virtual ~SrsBufferWriter();
public:
    virtual srs_error_t open(std::string file);
    virtual void close();
public:
    virtual bool is_open();
    virtual int64_t tellg();
public:
    virtual srs_error_t write(void* buf, size_t count, ssize_t* pnwrite);
    virtual srs_error_t writev(const iovec* iov, int iovcnt, ssize_t* pnwrite);
};

// HTTP Live Streaming, to transmux RTMP to HTTP FLV or other format.
// TODO: FIXME: Rename to SrsHttpLive
class SrsLiveStream : public ISrsHttpHandler, public ISrsExpire
{
private:
    SrsRequest* req;
    SrsBufferCache* cache;
    SrsSecurity* security_;
    SrsServer* server_;
    // For multiple viewers, which means there will more than one alive viewers for a live stream, so we must
    // use an int value to represent if there is any viewer is alive. We should never do cleanup unless all
    // viewers closed the connection.
    std::vector<ISrsExpire*> viewers_;
public:
    SrsLiveStream(SrsServer* s, SrsRequest* r, SrsBufferCache* c);
    virtual ~SrsLiveStream();
    virtual srs_error_t update_auth(SrsRequest* r);
public:
    virtual srs_error_t serve_http(ISrsHttpResponseWriter* w, ISrsHttpMessage* r);
    virtual bool alive();
// Interface ISrsExpire
public:
    virtual void expire();
private:
    virtual srs_error_t do_serve_http(SrsLiveSource* source, SrsLiveConsumer* consumer, ISrsHttpResponseWriter* w, ISrsHttpMessage* r);
    virtual srs_error_t http_hooks_on_play(ISrsHttpMessage* r);
    virtual void http_hooks_on_stop(ISrsHttpMessage* r);
    virtual srs_error_t streaming_send_messages(ISrsBufferEncoder* enc, SrsSharedPtrMessage** msgs, int nb_msgs);
};

// The Live Entry, to handle HTTP Live Streaming.
struct SrsLiveEntry
{
private:
    bool _is_flv;
    bool _is_ts;
    bool _is_aac;
    bool _is_mp3;
public:
    // We will free the request.
    SrsRequest* req;
public:
    // For template, the mount contains variables.
    // For concrete stream, the mount is url to access.
    std::string mount;
    
    SrsLiveStream* stream;
    SrsBufferCache* cache;

    // Whether is disposing the entry.
    bool disposing;
    
    SrsLiveEntry(std::string m);
    virtual ~SrsLiveEntry();
    
    bool is_flv();
    bool is_ts();
    bool is_mp3();
    bool is_aac();
};

// The HTTP Live Streaming Server, to serve FLV/TS/MP3/AAC stream.
// TODO: Support multiple stream.
class SrsHttpStreamServer : public ISrsReloadHandler
, public ISrsHttpMatchHijacker
{
private:
    SrsServer* server;
    SrsAsyncCallWorker* async_;
public:
    SrsHttpServeMux mux;
    // The http live streaming template, to create streams.
    std::map<std::string, SrsLiveEntry*> templateHandlers;
    // The http live streaming streams, created by template.
    std::map<std::string, SrsLiveEntry*> streamHandlers;
public:
    SrsHttpStreamServer(SrsServer* svr);
    virtual ~SrsHttpStreamServer();
public:
    virtual srs_error_t initialize();
public:
    // HTTP flv/ts/mp3/aac stream
    virtual srs_error_t http_mount(SrsRequest* r);
    virtual void http_unmount(SrsRequest* r);
// Interface ISrsHttpMatchHijacker
public:
    virtual srs_error_t hijack(ISrsHttpMessage* request, ISrsHttpHandler** ph);
private:
    virtual srs_error_t initialize_flv_streaming();
    virtual srs_error_t initialize_flv_entry(std::string vhost);
};

class SrsHttpStreamDestroy : public ISrsAsyncCallTask
{
private:
    std::string sid_;
    std::map<std::string, SrsLiveEntry*>* streamHandlers_;
    SrsHttpServeMux* mux_;
public:
    SrsHttpStreamDestroy(SrsHttpServeMux* mux, std::map<std::string, SrsLiveEntry*>* handlers, std::string sid);
    virtual ~SrsHttpStreamDestroy();
public:
    virtual srs_error_t call();
    virtual std::string to_string();
};

#endif

