// log.h : log utility
//
// Author:	Gongbing
//
// Create:	2019-08-07

#pragma once
#ifndef _INCLUDED_REF_
#define _INCLUDED_REF_
#include "../ref/ref.h"
#endif

//////////////////////////////////////////////////////////////////////////////////////////
// level
enum _log_level
{
	LOG_LEVEL_ALL = 1,
	LOG_LEVEL_PART,
	LOG_LEVEL_IMPORTANT,
	LOG_LEVEL_VERY_IMPORTANT,
	LOG_LEVEL_NONE = INT_MAX,
};
enum _log_type
{
	LOG_TYPE_NONE,
	LOG_TYPE_CONSOLE_OUT,
	LOG_TYPE_OUTPUTDBG,
	LOG_TYPE_WRITE_FILE,
	LOG_TYPE_USER_CUSTOM,
};

//////////////////////////////////////////////////////////////////////////////////////////
// macros
#ifndef UNICODE_STR
#define _TO_UNICODE(str)	L##str
#define UNICODE_STR(str)	_TO_UNICODE(str)
#define MAKE_UNICODE(str)	UNICODE_STR(str)
#endif

#define LOG_API_PROTO(name)		void(__stdcall *name)(const wchar_t* info, size_t words, void* user)
#define LOG_API_INSTANCE(name)	void __stdcall name(const wchar_t* info, size_t words, void* user)

namespace log_util
{
	//////////////////////////////////////////////////////////////////////////////////////////
	// log interface
	typedef LOG_API_PROTO(real_log);

	__declspec(novtable) struct ILog : public ref_util::IRef
	{
		// param0:	(const wchar_t*)path file when type is LOG_TYPE_WRITE_FILE, real_log when type is LOG_TYPE_USER_CUSTOM. otherwise always be ZERO
		// param1:	for parameter 'user' of real_log when type is LOG_TYPE_USER_CUSTOM, otherwise always be ZERO
		COM_API_DECLARE(int, set_log_level(_log_level level));
		COM_API_DECLARE(int, set_log_type(_log_type type, void* param0 = NULL, void* param1 = NULL)); // return type after this oper
		COM_API_DECLARE(void, write_log(const wchar_t* info, size_t bytes, _log_level level));
		COM_API_DECLARE(bool, is_level_enabled(_log_level level));	// whether the message of level can be logged
		COM_API_DECLARE(void, set_prefix(const wchar_t* pref));		// default is without prefix
		COM_API_DECLARE(void, enable_time_stamp(bool enable));		// default is without timestamp
	};

	// use inner log_util
	// param0:	(const wchar_t*)path file when type is LOG_TYPE_WRITE_FILE, real_log when type is LOG_TYPE_USER_CUSTOM. otherwise always be ZERO
	// param1:	for parameter 'user' of real_log when type is LOG_TYPE_USER_CUSTOM, otherwise always be ZERO
	PORT_API(ILog*) start_log(_log_type type = LOG_TYPE_OUTPUTDBG, _log_level level = LOG_LEVEL_ALL, void* param0 = NULL, void* param1 = NULL);
	PORT_API(ILog*) get_cur_log_util(void);

	// set an external log_util, NULL to stop current log, will invoke log->add_ref() if log is valid
	PORT_API(void) set_log_util(ILog* log);


	// invoke log
	PORT_API(bool) is_logging_enable(_log_level level);
	PORT_API_CALL(void, __cdecl) log(_log_level level, size_t estimate_bytes, const wchar_t* format, ...);
	PORT_API_CALL(void, __cdecl) log(_log_level level, size_t estimate_bytes, const char* format, ...);
}