/*
The MIT License (MIT)

Copyright (c) 2013 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.
*/

#include <srs_core_encoder.hpp>

#include <srs_core_error.hpp>
#include <srs_core_log.hpp>
#include <srs_core_config.hpp>

#define SRS_ENCODER_SLEEP_MS 2000

#define SRS_ENCODER_VCODEC "libx264"
#define SRS_ENCODER_ACODEC "libaacplus"

SrsFFMPEG::SrsFFMPEG(std::string ffmpeg_bin)
{
	started			= false;
	ffmpeg 			= ffmpeg_bin;
	
	vbitrate 		= 0;
	vfps 			= 0;
	vwidth 			= 0;
	vheight 		= 0;
	vthreads 		= 0;
	abitrate 		= 0;
	asample_rate 	= 0;
	achannels 		= 0;
}

SrsFFMPEG::~SrsFFMPEG()
{
	stop();
}

int SrsFFMPEG::initialize(std::string vhost, std::string port, std::string app, std::string stream, SrsConfDirective* engine)
{
	int ret = ERROR_SUCCESS;
	
	vcodec 			= config->get_engine_vcodec(engine);
	vbitrate 		= config->get_engine_vbitrate(engine);
	vfps 			= config->get_engine_vfps(engine);
	vwidth 			= config->get_engine_vwidth(engine);
	vheight 		= config->get_engine_vheight(engine);
	vthreads 		= config->get_engine_vthreads(engine);
	vprofile 		= config->get_engine_vprofile(engine);
	vpreset 		= config->get_engine_vpreset(engine);
	vparams 		= config->get_engine_vparams(engine);
	acodec 			= config->get_engine_acodec(engine);
	abitrate 		= config->get_engine_abitrate(engine);
	asample_rate 	= config->get_engine_asample_rate(engine);
	achannels 		= config->get_engine_achannels(engine);
	aparams 		= config->get_engine_aparams(engine);
	output 			= config->get_engine_output(engine);
	
	// ensure the size is even.
	vwidth -= vwidth % 2;
	vheight -= vheight % 2;
	
	if (vhost == RTMP_VHOST_DEFAULT) {
		output = srs_replace(output, "[vhost]", "127.0.0.1");
	} else {
		output = srs_replace(output, "[vhost]", vhost);
	}
	output = srs_replace(output, "[port]", port);
	output = srs_replace(output, "[app]", app);
	output = srs_replace(output, "[stream]", stream);
	
	if (vcodec != SRS_ENCODER_VCODEC) {
		ret = ERROR_ENCODER_VCODEC;
		srs_error("invalid vcodec, must be %s, actual %s, ret=%d",
			SRS_ENCODER_VCODEC, vcodec.c_str(), ret);
		return ret;
	}
	if (vbitrate <= 0) {
		ret = ERROR_ENCODER_VBITRATE;
		srs_error("invalid vbitrate: %d, ret=%d", vbitrate, ret);
		return ret;
	}
	if (vfps <= 0) {
		ret = ERROR_ENCODER_VFPS;
		srs_error("invalid vfps: %.2f, ret=%d", vfps, ret);
		return ret;
	}
	if (vwidth <= 0) {
		ret = ERROR_ENCODER_VWIDTH;
		srs_error("invalid vwidth: %d, ret=%d", vwidth, ret);
		return ret;
	}
	if (vheight <= 0) {
		ret = ERROR_ENCODER_VHEIGHT;
		srs_error("invalid vheight: %d, ret=%d", vheight, ret);
		return ret;
	}
	if (vthreads < 0) {
		ret = ERROR_ENCODER_VTHREADS;
		srs_error("invalid vthreads: %d, ret=%d", vthreads, ret);
		return ret;
	}
	if (vprofile.empty()) {
		ret = ERROR_ENCODER_VPROFILE;
		srs_error("invalid vprofile: %s, ret=%d", vprofile.c_str(), ret);
		return ret;
	}
	if (vpreset.empty()) {
		ret = ERROR_ENCODER_VPRESET;
		srs_error("invalid vpreset: %s, ret=%d", vpreset.c_str(), ret);
		return ret;
	}
	if (acodec != SRS_ENCODER_ACODEC) {
		ret = ERROR_ENCODER_ACODEC;
		srs_error("invalid acodec, must be %s, actual %s, ret=%d",
			SRS_ENCODER_ACODEC, acodec.c_str(), ret);
		return ret;
	}
	if (abitrate <= 0) {
		ret = ERROR_ENCODER_ABITRATE;
		srs_error("invalid abitrate: %d, ret=%d", 
			abitrate, ret);
		return ret;
	}
	if (asample_rate <= 0) {
		ret = ERROR_ENCODER_ASAMPLE_RATE;
		srs_error("invalid sample rate: %d, ret=%d", 
			asample_rate, ret);
		return ret;
	}
	if (achannels != 1 && achannels != 2) {
		ret = ERROR_ENCODER_ACHANNELS;
		srs_error("invalid achannels, must be 1 or 2, actual %d, ret=%d", 
			achannels, ret);
		return ret;
	}
	if (output.empty()) {
		ret = ERROR_ENCODER_OUTPUT;
		srs_error("invalid empty output, ret=%d", ret);
		return ret;
	}
	
	return ret;
}

int SrsFFMPEG::start()
{
	int ret = ERROR_SUCCESS;
	
	if (started) {
		return ret;
	}
	
	return ret;
}

void SrsFFMPEG::stop()
{
	if (!started) {
		return;
	}
}

SrsEncoder::SrsEncoder()
{
	tid = NULL;
	loop = false;
}

SrsEncoder::~SrsEncoder()
{
	on_unpublish();
}

int SrsEncoder::on_publish(std::string _vhost, std::string _port, std::string _app, std::string _stream)
{
	int ret = ERROR_SUCCESS;

	vhost = _vhost;
	port = _port;
	app = _app;
	stream = _stream;
	
	// parse all transcode engines.
	SrsConfDirective* conf = NULL;
	
	// parse vhost scope engines
	std::string scope = "";
	if ((conf = config->get_transcode(vhost, "")) != NULL) {
		if ((ret = parse_transcode(conf)) != ERROR_SUCCESS) {
			srs_error("parse vhost scope=%s transcode engines failed. "
				"ret=%d", scope.c_str(), ret);
			return ret;
		}
	}
	// parse app scope engines
	scope = app;
	if ((conf = config->get_transcode(vhost, app)) != NULL) {
		if ((ret = parse_transcode(conf)) != ERROR_SUCCESS) {
			srs_error("parse app scope=%s transcode engines failed. "
				"ret=%d", scope.c_str(), ret);
			return ret;
		}
	}
	// parse stream scope engines
	scope += "/";
	scope += stream;
	if ((conf = config->get_transcode(vhost, app + "/" + stream)) != NULL) {
		if ((ret = parse_transcode(conf)) != ERROR_SUCCESS) {
			srs_error("parse stream scope=%s transcode engines failed. "
				"ret=%d", scope.c_str(), ret);
			return ret;
		}
	}
    
    // start thread to run all encoding engines.
    srs_assert(!tid);
    if((tid = st_thread_create(encoder_thread, this, 1, 0)) == NULL) {
		ret = ERROR_ST_CREATE_FORWARD_THREAD;
        srs_error("st_thread_create failed. ret=%d", ret);
        return ret;
    }
    
	return ret;
}

void SrsEncoder::on_unpublish()
{
	if (tid) {
		loop = false;
		st_thread_interrupt(tid);
		st_thread_join(tid, NULL);
		tid = NULL;
	}
	
	std::vector<SrsFFMPEG*>::iterator it;
	for (it = ffmpegs.begin(); it != ffmpegs.end(); ++it) {
		SrsFFMPEG* ffmpeg = *it;
		srs_freep(ffmpeg);
	}
	ffmpegs.clear();
}

SrsFFMPEG* SrsEncoder::at(int index)
{
	return ffmpegs[index];
}

int SrsEncoder::parse_transcode(SrsConfDirective* conf)
{
	int ret = ERROR_SUCCESS;
	
	srs_assert(conf);
	
	// enabled
	if (!config->get_transcode_enabled(conf)) {
		srs_trace("ignore the disabled transcode: %s", 
			conf->arg0().c_str());
		return ret;
	}
	
	// ffmpeg
	std::string ffmpeg_bin = config->get_transcode_ffmpeg(conf);
	if (ffmpeg_bin.empty()) {
		srs_trace("ignore the empty ffmpeg transcode: %s", 
			conf->arg0().c_str());
		return ret;
	}
	
	// get all engines.
	std::vector<SrsConfDirective*> engines;
	config->get_transcode_engines(conf, engines);
	if (engines.empty()) {
		srs_trace("ignore the empty transcode engine: %s", 
			conf->arg0().c_str());
		return ret;
	}
	
	// create engine
	for (int i = 0; i < (int)engines.size(); i++) {
		SrsConfDirective* engine = engines[i];
		if (!config->get_engine_enabled(engine)) {
			srs_trace("ignore the diabled transcode engine: %s %s", 
				conf->arg0().c_str(), engine->arg0().c_str());
			continue;
		}
		
		SrsFFMPEG* ffmpeg = new SrsFFMPEG(ffmpeg_bin);
		
		if ((ret = ffmpeg->initialize(vhost, port, app, stream, engine)) != ERROR_SUCCESS) {
			srs_freep(ffmpeg);
			
			srs_error("invalid transcode engine: %s %s", 
				conf->arg0().c_str(), engine->arg0().c_str());
			return ret;
		}

		ffmpegs.push_back(ffmpeg);
	}
	
	return ret;
}

int SrsEncoder::cycle()
{
	int ret = ERROR_SUCCESS;
	
	// start all ffmpegs.
	std::vector<SrsFFMPEG*>::iterator it;
	for (it = ffmpegs.begin(); it != ffmpegs.end(); ++it) {
		SrsFFMPEG* ffmpeg = *it;
		if ((ret = ffmpeg->start()) != ERROR_SUCCESS) {
			srs_error("ffmpeg start failed. ret=%d", ret);
			return ret;
		}
	}
	
	return ret;
}

void SrsEncoder::encoder_cycle()
{
	int ret = ERROR_SUCCESS;
	
	log_context->generate_id();
	srs_trace("encoder cycle start");
	
	while (loop) {
		if ((ret = cycle()) != ERROR_SUCCESS) {
			srs_warn("encoder cycle failed, ignored and retry, ret=%d", ret);
		} else {
			srs_info("encoder cycle success, retry");
		}
		
		if (!loop) {
			break;
		}
		
		st_usleep(SRS_ENCODER_SLEEP_MS * 1000);
	}
	
	// kill ffmpeg when finished and it alive
	std::vector<SrsFFMPEG*>::iterator it;
	for (it = ffmpegs.begin(); it != ffmpegs.end(); ++it) {
		SrsFFMPEG* ffmpeg = *it;
		ffmpeg->stop();
	}
	
	srs_trace("encoder cycle finished");
}

void* SrsEncoder::encoder_thread(void* arg)
{
	SrsEncoder* obj = (SrsEncoder*)arg;
	srs_assert(obj != NULL);
	
	obj->loop = true;
	obj->encoder_cycle();
	
	return NULL;
}