// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

/// @file log.cpp
/// @brief Logging
/// @ingroup libaegisub

#include "../config.h"

#include <algorithm>
#include <cstdio>
#include <cstring>
#include <functional>
#include <memory>
#include <sstream>

#include "libaegisub/cajun/elements.h"
#include "libaegisub/cajun/writer.h"
#include "libaegisub/io.h"
#include "libaegisub/log.h"
#include "libaegisub/types.h"
#include "libaegisub/util.h"

#include <boost/range/algorithm.hpp>

namespace agi {
	namespace log {

/// Global log sink.
LogSink *log;

/// Short Severity ID
/// Keep this ordered the same as Severity
const char *Severity_ID = "EAWID";

SinkMessage::SinkMessage(const char *section, Severity severity,
						 const char *file, const char *func, int line,
						 agi_timeval tv)
: section(section)
, severity(severity)
, file(file)
, func(func)
, line(line)
, tv(tv)
, message(nullptr)
, len(0)
{
}

SinkMessage::~SinkMessage() {
	delete [] message;
}

/// @todo The log files need to be trimmed after N amount.
LogSink::~LogSink() {
	// The destructor for emitters may try to log messages, so disable all the
	// emitters before destructing any
	std::vector<Emitter*> emitters_temp;
	swap(emitters_temp, emitters);
	util::delete_clear(emitters_temp);

	util::delete_clear(sink);
}

void LogSink::log(SinkMessage *sm) {
	sink.push_back(sm);
	boost::for_each(emitters, [=](Emitter *em) { em->log(sm); });
}

void LogSink::Subscribe(Emitter *em) {
	LOG_D("agi/log/emitter/subscribe") << "Subscribe: " << this;
	emitters.push_back(em);
}

void LogSink::Unsubscribe(Emitter *em) {
	emitters.erase(remove(emitters.begin(), emitters.end(), em), emitters.end());
	delete em;
	LOG_D("agi/log/emitter/unsubscribe") << "Un-Subscribe: " << this;
}

Message::Message(const char *section,
				Severity severity,
				const char *file,
				const char *func,
				int line)
: len(1024)
, buf(new char[len])
, msg(buf, len)
{
	agi_timeval tv;
	util::time_log(tv);
	sm = new SinkMessage(section, severity, file, func, line, tv);
}

Message::~Message() {
	sm->message = msg.str();
	sm->len = (size_t)msg.pcount();
	agi::log::log->log(sm);
}

JsonEmitter::JsonEmitter(std::string const& directory, const agi::log::LogSink *log_sink)
: directory(directory)
, log_sink(log_sink)
{
	util::time_log(time_start);
}

JsonEmitter::~JsonEmitter() {
	json::Object root;
	json::Array &array = root["log"];

	agi_timeval time_close;
	util::time_log(time_close);

	Sink const& sink = *log_sink->GetSink();
	for (unsigned int i=0; i < sink.size(); i++) {
		json::Object entry;
		entry["sec"]      = (int64_t)sink[i]->tv.tv_sec;
		entry["usec"]     = (int64_t)sink[i]->tv.tv_usec;
		entry["severity"] = sink[i]->severity;
		entry["section"]  = sink[i]->section;
		entry["file"]     = sink[i]->file;
		entry["func"]     = sink[i]->func;
		entry["line"]     = sink[i]->line;
		entry["message"]  = std::string(sink[i]->message, sink[i]->len);

		array.push_back(std::move(entry));
	}

	json::Array &timeval_open = root["timeval"]["open"];
	timeval_open.push_back((int64_t)time_start.tv_sec);
	timeval_open.push_back((int64_t)time_start.tv_usec);

	json::Array &timeval_close = root["timeval"]["close"];
	timeval_close.push_back((int64_t)time_close.tv_sec);
	timeval_close.push_back((int64_t)time_close.tv_usec);

	std::stringstream str;
	str << directory << time_start.tv_sec << ".json";
	json::Writer::Write(root, io::Save(str.str()).Get());
}

	} // namespace log
} // namespace agi