//
// Copyright (c) 2013-2025 The SRS Authors
//
// SPDX-License-Identifier: MIT
//

#ifndef SRS_APP_EDGE_HPP
#define SRS_APP_EDGE_HPP

#include <srs_core.hpp>

#include <srs_app_st.hpp>
#include <srs_core_autofree.hpp>

#include <string>

class SrsStSocket;
class SrsRtmpServer;
class SrsLiveSource;
class ISrsRequest;
class SrsPlayEdge;
class SrsPublishEdge;
class SrsRtmpClient;
class SrsRtmpCommonMessage;
class SrsMessageQueue;
class ISrsProtocolReadWriter;
class SrsKbps;
class ISrsLbRoundRobin;
class SrsTcpClient;
class SrsSimpleRtmpClient;
class SrsRtmpCommand;
class SrsHttpClient;
class ISrsHttpMessage;
class SrsHttpFileReader;
class SrsFlvDecoder;

// The state of edge, auto machine
enum SrsEdgeState {
    SrsEdgeStateInit = 0,

    // For play edge
    SrsEdgeStatePlay = 100,
    // play stream from origin, ingest stream
    SrsEdgeStateIngestConnected = 101,

    // For publish edge
    SrsEdgeStatePublish = 200,

    // We are stopping edge ingesting.
    SrsEdgeStateIngestStopping = 300,
};

// The state of edge from user, manual machine
enum SrsEdgeUserState {
    SrsEdgeUserStateInit = 0,
    SrsEdgeUserStateReloading = 100,
};

// The upstream of edge, can be rtmp or http.
class SrsEdgeUpstream
{
public:
    SrsEdgeUpstream();
    virtual ~SrsEdgeUpstream();

public:
    virtual srs_error_t connect(ISrsRequest *r, ISrsLbRoundRobin *lb) = 0;
    virtual srs_error_t recv_message(SrsRtmpCommonMessage **pmsg) = 0;
    virtual srs_error_t decode_message(SrsRtmpCommonMessage *msg, SrsRtmpCommand **ppacket) = 0;
    virtual void close() = 0;

public:
    virtual void selected(std::string &server, int &port) = 0;
    virtual void set_recv_timeout(srs_utime_t tm) = 0;
    virtual void kbps_sample(const char *label, srs_utime_t age) = 0;
};

class SrsEdgeRtmpUpstream : public SrsEdgeUpstream
{
private:
    // For RTMP 302, if not empty,
    // use this <ip[:port]> as upstream.
    std::string redirect_;
    SrsSimpleRtmpClient *sdk_;

private:
    // Current selected server, the ip:port.
    std::string selected_ip_;
    int selected_port_;

public:
    // @param rediect, override the server. ignore if empty.
    SrsEdgeRtmpUpstream(std::string r);
    virtual ~SrsEdgeRtmpUpstream();

public:
    virtual srs_error_t connect(ISrsRequest *r, ISrsLbRoundRobin *lb);
    virtual srs_error_t recv_message(SrsRtmpCommonMessage **pmsg);
    virtual srs_error_t decode_message(SrsRtmpCommonMessage *msg, SrsRtmpCommand **ppacket);
    virtual void close();

public:
    virtual void selected(std::string &server, int &port);
    virtual void set_recv_timeout(srs_utime_t tm);
    virtual void kbps_sample(const char *label, srs_utime_t age);
};

class SrsEdgeFlvUpstream : public SrsEdgeUpstream
{
private:
    std::string schema_;
    SrsHttpClient *sdk_;
    ISrsHttpMessage *hr_;

private:
    SrsHttpFileReader *reader_;
    SrsFlvDecoder *decoder_;

private:
    // We might modify the request by HTTP redirect.
    ISrsRequest *req_;
    // Current selected server, the ip:port.
    std::string selected_ip_;
    int selected_port_;

public:
    SrsEdgeFlvUpstream(std::string schema);
    virtual ~SrsEdgeFlvUpstream();

public:
    virtual srs_error_t connect(ISrsRequest *r, ISrsLbRoundRobin *lb);

private:
    virtual srs_error_t do_connect(ISrsRequest *r, ISrsLbRoundRobin *lb, int redirect_depth);

public:
    virtual srs_error_t recv_message(SrsRtmpCommonMessage **pmsg);
    virtual srs_error_t decode_message(SrsRtmpCommonMessage *msg, SrsRtmpCommand **ppacket);
    virtual void close();

public:
    virtual void selected(std::string &server, int &port);
    virtual void set_recv_timeout(srs_utime_t tm);
    virtual void kbps_sample(const char *label, srs_utime_t age);
};

// The edge used to ingest stream from origin.
class SrsEdgeIngester : public ISrsCoroutineHandler
{
private:
    // Because source references to this object, so we should directly use the source ptr.
    SrsLiveSource *source_;

private:
    SrsPlayEdge *edge_;
    ISrsRequest *req_;
    SrsCoroutine *trd_;
    ISrsLbRoundRobin *lb_;
    SrsEdgeUpstream *upstream_;

public:
    SrsEdgeIngester();
    virtual ~SrsEdgeIngester();

public:
    virtual srs_error_t initialize(SrsSharedPtr<SrsLiveSource> s, SrsPlayEdge *e, ISrsRequest *r);
    virtual srs_error_t start();
    virtual void stop();

    // Interface ISrsReusableThread2Handler
public:
    virtual srs_error_t cycle();

private:
    virtual srs_error_t do_cycle();

private:
    virtual srs_error_t ingest(std::string &redirect);
    virtual srs_error_t process_publish_message(SrsRtmpCommonMessage *msg, std::string &redirect);
};

// The edge used to forward stream to origin.
class SrsEdgeForwarder : public ISrsCoroutineHandler
{
private:
    // Because source references to this object, so we should directly use the source ptr.
    SrsLiveSource *source_;

private:
    SrsPublishEdge *edge_;
    ISrsRequest *req_;
    SrsCoroutine *trd_;
    SrsSimpleRtmpClient *sdk_;
    ISrsLbRoundRobin *lb_;
    // we must ensure one thread one fd principle,
    // that is, a fd must be write/read by the one thread.
    // The publish service thread will proxy(msg), and the edge forward thread
    // will cycle(), so we use queue for cycle to send the msg of proxy.
    SrsMessageQueue *queue_;
    // error code of send, for edge proxy thread to query.
    int send_error_code_;

public:
    SrsEdgeForwarder();
    virtual ~SrsEdgeForwarder();

public:
    virtual void set_queue_size(srs_utime_t queue_size);

public:
    virtual srs_error_t initialize(SrsSharedPtr<SrsLiveSource> s, SrsPublishEdge *e, ISrsRequest *r);
    virtual srs_error_t start();
    virtual void stop();
    // Interface ISrsReusableThread2Handler
public:
    virtual srs_error_t cycle();

private:
    virtual srs_error_t do_cycle();

public:
    virtual srs_error_t proxy(SrsRtmpCommonMessage *msg);
};

// The play edge control service.
class SrsPlayEdge
{
private:
    SrsEdgeState state_;
    SrsEdgeIngester *ingester_;

public:
    SrsPlayEdge();
    virtual ~SrsPlayEdge();

public:
    // Always use the req of source,
    // For we assume all client to edge is invalid,
    // if auth open, edge must valid it from origin, then service it.
    virtual srs_error_t initialize(SrsSharedPtr<SrsLiveSource> source, ISrsRequest *req);
    // When client play stream on edge.
    virtual srs_error_t on_client_play();
    // When all client stopped play, disconnect to origin.
    virtual void on_all_client_stop();

public:
    // When ingester start to play stream.
    virtual srs_error_t on_ingest_play();
};

// The publish edge control service.
class SrsPublishEdge
{
private:
    SrsEdgeState state_;
    SrsEdgeForwarder *forwarder_;

public:
    SrsPublishEdge();
    virtual ~SrsPublishEdge();

public:
    virtual void set_queue_size(srs_utime_t queue_size);

public:
    virtual srs_error_t initialize(SrsSharedPtr<SrsLiveSource> source, ISrsRequest *req);
    virtual bool can_publish();
    // When client publish stream on edge.
    virtual srs_error_t on_client_publish();
    // Proxy publish stream to edge
    virtual srs_error_t on_proxy_publish(SrsRtmpCommonMessage *msg);
    // Proxy unpublish stream to edge.
    virtual void on_proxy_unpublish();
};

#endif