/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#include <math.h>

#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif

#import "OFDate.h"
#import "OFStdIOStream.h"
#import "OFTimer.h"

#import "ProgressBar.h"

#define GIBIBYTE (1024 * 1024 * 1024)
#define MEBIBYTE (1024 * 1024)
#define KIBIBYTE (1024)

#define UPDATE_INTERVAL 0.1

@implementation ProgressBar
- initWithLength: (intmax_t)length
     resumedFrom: (intmax_t)resumedFrom
{
	self = [super init];

	@try {
		void *pool = objc_autoreleasePoolPush();

		_length = length;
		_resumedFrom = resumedFrom;
		_startDate = [[OFDate alloc] init];
		_lastReceivedDate = [[OFDate alloc] init];
		_drawTimer = [[OFTimer
		    scheduledTimerWithTimeInterval: UPDATE_INTERVAL
					    target: self
					  selector: @selector(draw)
					   repeats: true] retain];
		_BPSTimer = [[OFTimer
		    scheduledTimerWithTimeInterval: 1.0
					    target: self
					  selector: @selector(
							calculateBPSAndETA)
					   repeats: true] retain];

		objc_autoreleasePoolPop(pool);
	} @catch (id e) {
		[self release];
		@throw e;
	}

	return self;
}

- (void)dealloc
{
	[self stop];

	[_startDate release];
	[_lastReceivedDate release];
	[_drawTimer release];
	[_BPSTimer release];

	[super dealloc];
}

- (void)setReceived: (intmax_t)received
{
	_received = received;
}

- (void)_drawProgress
{
	size_t i;
	float bars, percent;
	unsigned short barWidth;
#ifdef HAVE_SYS_IOCTL_H
	struct winsize ws;

	if (ioctl(0, TIOCGWINSZ, &ws) == 0 && ws.ws_col > 37)
		barWidth = ws.ws_col - 37;
	else
		barWidth = 0;
#else
	barWidth = 43;
#endif

	bars = (float)(_resumedFrom + _received) /
	    (float)(_resumedFrom + _length) * barWidth;
	percent = (float)(_resumedFrom + _received) /
	    (float)(_resumedFrom + _length) * 100;

	[of_stdout writeString: @"\r  ▕"];

	for (i = 0; i < (size_t)bars; i++)
		[of_stdout writeString: @"█"];
	if (bars < barWidth) {
		float remainder = bars - floorf(bars);

		if (remainder >= 0.875)
			[of_stdout writeString: @"▉"];
		else if (remainder >= 0.75)
			[of_stdout writeString: @"▊"];
		else if (remainder >= 0.625)
			[of_stdout writeString: @"▋"];
		else if (remainder >= 0.5)
			[of_stdout writeString: @"▌"];
		else if (remainder >= 0.375)
			[of_stdout writeString: @"▍"];
		else if (remainder >= 0.25)
			[of_stdout writeString: @"▎"];
		else if (remainder >= 0.125)
			[of_stdout writeString: @"▏"];
		else
			[of_stdout writeString: @" "];

		for (i = 0; i < barWidth - (size_t)bars - 1; i++)
			[of_stdout writeString: @" "];
	}

	[of_stdout writeFormat: @"▏ %6.2f%% ", percent];

	if (percent == 100) {
		double timeInterval = -[_startDate timeIntervalSinceNow];

		_BPS = (float)_received / (float)timeInterval;
		_ETA = timeInterval;
	}

	if (isinf(_ETA))
		[of_stdout writeString: @"--:--:-- "];
	else if (_ETA >= 99 * 3600)
		[of_stdout writeFormat: @"%4.2f d ", _ETA / (24 * 3600)];
	else
		[of_stdout writeFormat: @"%2u:%02u:%02u ",
		    (uint8_t)(_ETA / 3600), (uint8_t)(_ETA / 60) % 60,
		    (uint8_t)_ETA % 60];

	if (_BPS >= GIBIBYTE)
		[of_stdout writeFormat: @"%7.2f GiB/s", _BPS / GIBIBYTE];
	else if (_BPS >= MEBIBYTE)
		[of_stdout writeFormat: @"%7.2f MiB/s", _BPS / MEBIBYTE];
	else if (_BPS >= KIBIBYTE)
		[of_stdout writeFormat: @"%7.2f KiB/s", _BPS / KIBIBYTE];
	else
		[of_stdout writeFormat: @"%7.2f B/s  ", _BPS];
}

- (void)_drawReceived
{
	if (_resumedFrom + _received >= GIBIBYTE)
		[of_stdout writeFormat:
		    @"\r  %7.2f GiB ",
		    (float)(_resumedFrom + _received) / GIBIBYTE];
	else if (_resumedFrom + _received >= MEBIBYTE)
		[of_stdout writeFormat:
		    @"\r  %7.2f MiB ",
		    (float)(_resumedFrom + _received) / MEBIBYTE];
	else if (_resumedFrom + _received >= KIBIBYTE)
		[of_stdout writeFormat:
		    @"\r  %7.2f KiB ",
		    (float)(_resumedFrom + _received) / KIBIBYTE];
	else
		[of_stdout writeFormat:
		    @"\r  %jd bytes ", _resumedFrom + _received];

	if (_stopped)
		_BPS = (float)_received /
		    -(float)[_startDate timeIntervalSinceNow];

	if (_BPS >= GIBIBYTE)
		[of_stdout writeFormat: @"%7.2f GiB/s", _BPS / GIBIBYTE];
	else if (_BPS >= MEBIBYTE)
		[of_stdout writeFormat: @"%7.2f MiB/s", _BPS / MEBIBYTE];
	else if (_BPS >= KIBIBYTE)
		[of_stdout writeFormat: @"%7.2f KiB/s", _BPS / KIBIBYTE];
	else
		[of_stdout writeFormat: @"%7.2f B/s  ", _BPS];
}

- (void)draw
{
	if (_length > 0)
		[self _drawProgress];
	else
		[self _drawReceived];
}

- (void)calculateBPSAndETA
{
	_BPS = (float)(_received - _lastReceived) /
	    -(float)[_lastReceivedDate timeIntervalSinceNow];
	_ETA = (double)(_length - _resumedFrom - _received) / _BPS;

	_lastReceived = _received;
	[_lastReceivedDate release];
	_lastReceivedDate = [[OFDate alloc] init];
}

- (void)stop
{
	[_drawTimer invalidate];
	[_BPSTimer invalidate];

	_stopped = true;
}
@end
