/****************************************************************************
**
** This file is part of the LibreCAD project, a 2D CAD program
**
** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software 
** Foundation and appearing in the file gpl-2.0.txt included in the
** packaging of this file.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
** 
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
**
** This copyright notice MUST APPEAR in all copies of the script!  
**
**********************************************************************/


#include "rs_debug.h"

#include <iostream>
#include <cstdio>
#include <cstdarg>
#include <QString>

#include <QDateTime>
#include <QDebug>

RS_Debug* RS_Debug::uniqueInstance = nullptr;
void debugHeader(char const* file, char const* func, int line)
{
	std::cout<<file<<" : "<<func<<" : line "<<line<<std::endl;
}

/**
 *  Gets the one and only RS_Debug instance
 *  (creates a new one on first call only)
 *
 *  @return Pointer to the single instance of this
 * singleton class
 */
RS_Debug* RS_Debug::instance() {
	if(!uniqueInstance) {
        QDateTime now = QDateTime::currentDateTime();
        QString nowStr;
		nowStr = now.toString("yyyyMMdd_hhmmss");

        //QString fName = QString("%1/debug_%2.log")
		//	.arg(RS_SYSTEM->getHomeDir())
		//	.arg(nowStr);
        // 定义打印日志名称
        QString fName = QString("debug_%1.log").arg(nowStr);

        uniqueInstance = new RS_Debug;
        // 获取日志文件句柄
        //uniqueInstance->stream = fopen(fName.latin1(), "wt");
        uniqueInstance->stream = stderr;
    }
    return uniqueInstance;
}


/**
 * Deletes the one and only RS_Debug instance.
 */
void
RS_Debug::deleteInstance() {
    if (uniqueInstance) {
        fclose(uniqueInstance->stream);
        delete uniqueInstance;
    }
}

/**
 * Constructor setting the default debug level.
 */
RS_Debug::RS_Debug()
{
    debugLevel = D_DEBUGGING;
}

/**
 * Sets the debugging level.
 */
void RS_Debug::setLevel(RS_DebugLevel level) {
    if(debugLevel==level) return;
    debugLevel = level;
    print( D_NOTHING, "RS_DEBUG::setLevel(%d)", level);
    print( D_CRITICAL, "RS_DEBUG: Critical");
    print( D_ERROR, "RS_DEBUG: Errors");
    print( D_WARNING, "RS_DEBUG: Warnings");
    print( D_NOTICE, "RS_DEBUG: Notice");
    print( D_INFORMATIONAL, "RS_DEBUG: Informational");
    print( D_DEBUGGING, "RS_DEBUG: Debugging");
}


/**
 * Gets the current debugging level.
 */
RS_Debug::RS_DebugLevel RS_Debug::getLevel() {
    return debugLevel;
}


/**
 * Prints the given message to stdout.
 * 实现把文本字符串写入文件，并且文本字符可以带多个格式参数
 */
void RS_Debug::print(const char* format ...) {
    if(debugLevel==D_DEBUGGING) {
        // 定义可变参数指针
        va_list ap;
        // 初始化可变参数指针，指向第一个可变参数
        va_start(ap, format);
        // 使用参数列表发送格式化输出到流 stream 中
        // 参数1：这是指向 FILE 对象的指针，该 FILE 对象标识了流
        // 参数2：这是 C 字符串，包含了要被写入到流 stream 中的文本。它可以包含嵌入的 format 标签，format 标签可被随后的附加参数中指定的值替换，并按需求进行格式化。
        // 参数3：可变参数指针
        vfprintf(stream, format, ap);
        fprintf(stream, "\n");
        va_end(ap);
        fflush(stream);
    }
}

/**
 * Prints the given message to stdout if the current debug level
 * is lower then the given level
 *
 * @param level Debug level.
 */
void RS_Debug::print(RS_DebugLevel level, const char* format ...) {

    if(debugLevel>=level) {
        va_list ap;
        va_start(ap, format);
        vfprintf(stream, format, ap);
        fprintf(stream, "\n");
        va_end(ap);
        fflush(stream);
    }

}


/**
 * Prints a time stamp in the format yyyyMMdd_hhmmss.
 */
void RS_Debug::timestamp() {
    QDateTime now = QDateTime::currentDateTime();
    QString nowStr;

	nowStr = now.toString("yyyyMMdd_hh:mm:ss:zzz ");
    fprintf(stream, "%s", nowStr.toLatin1().data());
    fprintf(stream, "\n");
    fflush(stream);
}


/**
 * Prints the unicode for every character in the given string.
 */
void RS_Debug::printUnicode(const QString& text) {
	for(auto const& v: text){
		print("[%X] %c", v.unicode(), v.toLatin1());
    }
}


// EOF