//
// Copyright (c) 2013-2021 The SRS Authors
//
// SPDX-License-Identifier: MIT or MulanPSL-2.0
//

#include <srs_app_coworkers.hpp>

#include <stdlib.h>
using namespace std;

#include <srs_protocol_json.hpp>
#include <srs_kernel_error.hpp>
#include <srs_rtmp_stack.hpp>
#include <srs_app_config.hpp>
#include <srs_protocol_utility.hpp>
#include <srs_service_utility.hpp>
#include <srs_kernel_utility.hpp>

SrsCoWorkers* SrsCoWorkers::_instance = NULL;

SrsCoWorkers::SrsCoWorkers()
{
}

SrsCoWorkers::~SrsCoWorkers()
{
    map<string, SrsRequest*>::iterator it;
    for (it = streams.begin(); it != streams.end(); ++it) {
        SrsRequest* r = it->second;
        srs_freep(r);
    }
    streams.clear();
}

SrsCoWorkers* SrsCoWorkers::instance()
{
    if (!_instance) {
        _instance = new SrsCoWorkers();
    }
    return _instance;
}

SrsJsonAny* SrsCoWorkers::dumps(string vhost, string coworker, string app, string stream)
{
    SrsRequest* r = find_stream_info(vhost, app, stream);
    if (!r) {
        // TODO: FIXME: Find stream from our origin util return to the start point.
        return SrsJsonAny::null();
    }

    // The service port parsing from listen port.
    string listen_host;
    int listen_port = SRS_CONSTS_RTMP_DEFAULT_PORT;
    vector<string> listen_hostports = _srs_config->get_listens();
    if (!listen_hostports.empty()) {
        string list_hostport = listen_hostports.at(0);

        if (list_hostport.find(":") != string::npos) {
            srs_parse_hostport(list_hostport, listen_host, listen_port);
        } else {
            listen_port = ::atoi(list_hostport.c_str());
        }
    }

    // The ip of server, we use the request coworker-host as ip, if listen host is localhost or loopback.
    // For example, the server may behind a NAT(192.x.x.x), while its ip is a docker ip(172.x.x.x),
    // we should use the NAT(192.x.x.x) address as it's the exposed ip.
    // @see https://github.com/ossrs/srs/issues/1501
    string service_ip;
    if (listen_host != SRS_CONSTS_LOCALHOST && listen_host != SRS_CONSTS_LOOPBACK && listen_host != SRS_CONSTS_LOOPBACK6) {
        service_ip = listen_host;
    }
    if (service_ip.empty()) {
        int coworker_port;
        string coworker_host = coworker;
        if (coworker.find(":") != string::npos) {
            srs_parse_hostport(coworker, coworker_host, coworker_port);
        }

        service_ip = coworker_host;
    }
    if (service_ip.empty()) {
        service_ip = srs_get_public_internet_address();
    }

    // The backend API endpoint.
    string backend = _srs_config->get_http_api_listen();
    if (backend.find(":") == string::npos) {
        backend = service_ip + ":" + backend;
    }
    
    // The routers to detect loop and identify path.
    SrsJsonArray* routers = SrsJsonAny::array()->append(SrsJsonAny::str(backend.c_str()));

    srs_trace("Redirect vhost=%s, path=%s/%s to ip=%s, port=%d, api=%s",
        vhost.c_str(), app.c_str(), stream.c_str(), service_ip.c_str(), listen_port, backend.c_str());

    return SrsJsonAny::object()
        ->set("ip", SrsJsonAny::str(service_ip.c_str()))
        ->set("port", SrsJsonAny::integer(listen_port))
        ->set("vhost", SrsJsonAny::str(r->vhost.c_str()))
        ->set("api", SrsJsonAny::str(backend.c_str()))
        ->set("routers", routers);
}

SrsRequest* SrsCoWorkers::find_stream_info(string vhost, string app, string stream)
{
    // First, we should parse the vhost, if not exists, try default vhost instead.
    SrsConfDirective* conf = _srs_config->get_vhost(vhost, true);
    if (!conf) {
        return NULL;
    }
    
    // Get stream information from local cache.
    string url = srs_generate_stream_url(conf->arg0(), app, stream);
    map<string, SrsRequest*>::iterator it = streams.find(url);
    if (it == streams.end()) {
        return NULL;
    }
    
    return it->second;
}

srs_error_t SrsCoWorkers::on_publish(SrsLiveSource* s, SrsRequest* r)
{
    srs_error_t err = srs_success;
    
    string url = r->get_stream_url();
    
    // Delete the previous stream informations.
    map<string, SrsRequest*>::iterator it = streams.find(url);
    if (it != streams.end()) {
        srs_freep(it->second);
    }
    
    // Always use the latest one.
    streams[url] = r->copy();
    
    return err;
}

void SrsCoWorkers::on_unpublish(SrsLiveSource* s, SrsRequest* r)
{
    string url = r->get_stream_url();
    
    map<string, SrsRequest*>::iterator it = streams.find(url);
    if (it != streams.end()) {
        srs_freep(it->second);
        streams.erase(it);
    }
}