/********************************************************
 *  ██████╗  ██████╗████████╗██╗
 * ██╔════╝ ██╔════╝╚══██╔══╝██║
 * ██║  ███╗██║        ██║   ██║
 * ██║   ██║██║        ██║   ██║
 * ╚██████╔╝╚██████╗   ██║   ███████╗
 *  ╚═════╝  ╚═════╝   ╚═╝   ╚══════╝
 * Geophysical Computational Tools & Library (GCTL)
 *
 * Copyright (c) 2023  Yi Zhang (yizhang-geo@zju.edu.cn)
 *
 * GCTL is distributed under a dual licensing scheme. You can redistribute 
 * it and/or modify it under the terms of the GNU Lesser General Public 
 * License as published by the Free Software Foundation, either version 2 
 * of the License, or (at your option) any later version. You should have 
 * received a copy of the GNU Lesser General Public License along with this 
 * program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * If the terms and conditions of the LGPL v.2. would prevent you from using 
 * the GCTL, please consider the option to obtain a commercial license for a 
 * fee. These licenses are offered by the GCTL's original author. As a rule, 
 * licenses are provided "as-is", unlimited in time for a one time fee. Please 
 * send corresponding requests to: yizhang-geo@zju.edu.cn. Please do not forget 
 * to include some description of your company and the realm of its activities. 
 * Also add information on how to contact you by electronic and paper mail.
 ******************************************************/

#include "progress_bar.h"


gctl::progress_bar::progress_bar(){}

gctl::progress_bar::progress_bar(unsigned long n_, const char* description_, 
	std::ostream& out_)
{
	reset(n_, description_, out_);
}

void gctl::progress_bar::reset(unsigned long n_, const char *description_, 
	std::ostream& out_)
{
	n = n_;
	frequency_update = n_;
	description = description_;
	out = &out_;
	
	unit_bar = "\u2588";
	unit_space = "-";
	desc_width = std::strlen(description); // character width of description field
	return;
}

void gctl::progress_bar::set_frequency_update(unsigned long frequency_update_)
{
	if(frequency_update_ > n)
	{
		frequency_update = n; // prevents crash if freq_updates_ > n_
	}
	else
	{
		frequency_update = frequency_update_;
	}
	return;
}

void gctl::progress_bar::set_style(const char* unit_bar_, const char* unit_space_)
{
	unit_bar = unit_bar_;
	unit_space = unit_space_;
	return;
}

int gctl::progress_bar::get_console_width()
{
	int width;

	#ifdef _WINDOWS
		CONSOLE_SCREEN_BUFFER_INFO csbi;
		GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
		width = csbi.srWindow.Right - csbi.srWindow.Left;
	#else
		struct winsize win;
		//注意！当我们使用pipe here-doc等通道获取程序参数时无法正确的获取窗口大小 此时我们将使用预定值
		if (ioctl(0, TIOCGWINSZ, &win) != -1)
			width = win.ws_col;
		else width = 100;
	#endif

	return width;
}

int gctl::progress_bar::get_bar_length()
{
	// get console width and according adjust the length of the progress bar
	int bar_length = static_cast<int>((get_console_width() - desc_width - CHARACTER_WIDTH_PERCENTAGE) / 2.);
	return bar_length;
}

void gctl::progress_bar::clear_bar_field()
{
	for(int i = 0; i < get_console_width(); ++i)
	{
		*out << " ";
	}
	*out << "\r" << std::flush;
	return;
}

void gctl::progress_bar::progressed(unsigned long idx_)
{
	try
	{
		if(idx_ > n) throw idx_;

		// determines whether to update the progress bar from frequency_update
		if ((idx_ != n-1) && ((idx_+1) % (n/frequency_update) != 0)) return;

		// calculate the size of the progress bar
		int bar_size = get_bar_length();
	
		// calculate percentage of progress
		double progress_percent;
		if (n == 1)
			progress_percent = 100.0;
		else progress_percent = idx_* TOTAL_PERCENTAGE/(n-1);

		// calculate the percentage value of a unit bar 
		double percent_per_unit_bar = TOTAL_PERCENTAGE/bar_size;

		// display progress bar
		*out << " " << description << " |";

		for(int bar_length=0;bar_length<=bar_size-1;++bar_length){
			if(bar_length*percent_per_unit_bar<progress_percent){
				*out << unit_bar;
			}
			else{
				*out << unit_space;
			}
		}

		if(idx_ == n-1)
			*out << "|" << std::setw(CHARACTER_WIDTH_PERCENTAGE + 1) << std::setprecision(1) << std::fixed << progress_percent << "%\r" << std::flush << std::endl;
		else *out << "|" << std::setw(CHARACTER_WIDTH_PERCENTAGE + 1) << std::setprecision(1) << std::fixed << progress_percent << "%\r" << std::flush;
	}
	catch(unsigned long e)
	{
		clear_bar_field();
		throw runtime_error("Index went out of bounds. From progress_bar::progressed(...)");
	}
	return;
}

void gctl::progress_bar::progressed_simple(unsigned long idx_)
{
	try
	{
		if(idx_ > n) throw idx_;

		// determines whether to update the progress bar from frequency_update
		if ((idx_ != n-1) && ((idx_+1) % (n/frequency_update) != 0)) return;

		// calculate percentage of progress
		double progress_percent;
		if (n == 1)
			progress_percent = 100.0;
		else progress_percent = idx_* TOTAL_PERCENTAGE/(n-1);

		// display progress bar
		*out << " " << description << ":";

		if(idx_ == n-1)
			*out << std::setw(CHARACTER_WIDTH_PERCENTAGE + 1) << std::setprecision(1) << std::fixed << progress_percent << "%\r" << std::flush << std::endl;
		else *out << std::setw(CHARACTER_WIDTH_PERCENTAGE + 1) << std::setprecision(1) << std::fixed << progress_percent << "%\r" << std::flush;
	}
	catch(unsigned long e)
	{
		clear_bar_field();
		throw runtime_error("Index went out of bounds. From progress_bar::progressed(...)");
	}
	return;
}