// 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.
//
// $Id$

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

#ifndef AGI_PRE
#include <stdio.h>
#include <string.h>

#include <algorithm>
#include <functional>
#include <memory>
#endif

#include "libaegisub/log.h"
#include "libaegisub/mutex.h"
#include "libaegisub/types.h"
#include "libaegisub/util.h"

namespace agi {
	namespace log {

/// Global log sink.
std::auto_ptr<LogSink> log(new LogSink());

/// 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(NULL)
, len(0)
{
}

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


LogSink::LogSink() {
}

LogSink::~LogSink() {
/// @todo This needs to flush all log data to disk on quit.
	agi::util::delete_clear(sink);
}


void LogSink::log(SinkMessage *sm) {
	sink.push_back(sm);

	std::for_each(
		emitters.begin(),
		emitters.end(),
		std::bind2nd(std::mem_fun(&Emitter::log), sm));
}

void LogSink::Subscribe(Emitter *em) {
	emitters.push_back(em);
}

void LogSink::Unsubscribe(Emitter *em) {
	emitters.erase(std::remove(emitters.begin(), emitters.end(), em), emitters.end());
}

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 = msg.pcount();
	agi::log::log->log(sm);
}

Emitter::Emitter() {
}

Emitter::~Emitter() {
	Disable();
}

void Emitter::Enable() {
	agi::log::log->Subscribe(this);
}

void Emitter::Disable() {
	agi::log::log->Unsubscribe(this);
}


	} // namespace log
} // namespace agi