//-----------------------------------------------------------------------------
// Copyright (C) 2009 Michael Gernoth <michael at gernoth.net>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// GUI (QT)
//-----------------------------------------------------------------------------
#include "proxguiqt.h"

#include <stdbool.h>
#include <iostream>
#include <QPainterPath>
#include <QBrush>
#include <QPen>
#include <QTimer>
#include <QCloseEvent>
#include <QMouseEvent>
#include <QKeyEvent>
#include <math.h>
#include <limits.h>
#include <stdio.h>
#include <QSlider>
#include <QHBoxLayout>
#include <string.h>
#include "proxgui.h"
#include <QtGui>

bool g_useOverlays = false;
int g_absVMax = 0;
int startMax;
int PageWidth;
int unlockStart = 0;

void ProxGuiQT::ShowGraphWindow(void) {
	emit ShowGraphWindowSignal();
}

void ProxGuiQT::RepaintGraphWindow(void) {
	emit RepaintGraphWindowSignal();
}

void ProxGuiQT::HideGraphWindow(void) {
	emit HideGraphWindowSignal();
}

void ProxGuiQT::Exit(void) {
	emit ExitSignal();
}

void ProxGuiQT::_ShowGraphWindow(void) {
	if(!plotapp)
		return;

	if (!plotwidget)
		plotwidget = new ProxWidget();

	plotwidget->show();
}

void ProxGuiQT::_RepaintGraphWindow(void) {
	if (!plotapp || !plotwidget)
		return;

	plotwidget->update();
}

void ProxGuiQT::_HideGraphWindow(void) {
	if (!plotapp || !plotwidget)
		return;

	plotwidget->hide();
}

void ProxGuiQT::_Exit(void) {
	delete this;
}

void ProxGuiQT::MainLoop() {
	plotapp = new QApplication(argc, argv);

	connect(this, SIGNAL(ShowGraphWindowSignal()), this, SLOT(_ShowGraphWindow()));
	connect(this, SIGNAL(RepaintGraphWindowSignal()), this, SLOT(_RepaintGraphWindow()));
	connect(this, SIGNAL(HideGraphWindowSignal()), this, SLOT(_HideGraphWindow()));
	connect(this, SIGNAL(ExitSignal()), this, SLOT(_Exit()));

	plotapp->exec();
}

ProxGuiQT::ProxGuiQT(int argc, char **argv) : plotapp(NULL), plotwidget(NULL), argc(argc), argv(argv) {}

ProxGuiQT::~ProxGuiQT(void) {
	if (plotapp) {
		plotapp->quit();
		plotapp = NULL;
	}
}

//--------------------
void ProxWidget::applyOperation() {
	//printf("ApplyOperation()");
	save_restoreGB(GRAPH_SAVE);
	memcpy(GraphBuffer, s_Buff, sizeof(int) * GraphTraceLen);
	RepaintGraphWindow();
}
void ProxWidget::stickOperation() {
	save_restoreGB(GRAPH_RESTORE);
	//printf("stickOperation()");
}
void ProxWidget::vchange_autocorr(int v) {
	int ans = AutoCorrelate(GraphBuffer, s_Buff, GraphTraceLen, v, true, false);
	if (g_debugMode) printf("vchange_autocorr(w:%d): %d\n", v, ans);
	g_useOverlays = true;
	RepaintGraphWindow();
}
void ProxWidget::vchange_askedge(int v) {
	//extern int AskEdgeDetect(const int *in, int *out, int len, int threshold);
	int ans = AskEdgeDetect(GraphBuffer, s_Buff, GraphTraceLen, v);
	if (g_debugMode) printf("vchange_askedge(w:%d)%d\n", v, ans);
	g_useOverlays = true;
	RepaintGraphWindow();
}
void ProxWidget::vchange_dthr_up(int v) {
	int down = opsController->horizontalSlider_dirthr_down->value();
	directionalThreshold(GraphBuffer, s_Buff, GraphTraceLen, v, down);
	//printf("vchange_dthr_up(%d)", v);
	g_useOverlays = true;
	RepaintGraphWindow();
}
void ProxWidget::vchange_dthr_down(int v) {
	//printf("vchange_dthr_down(%d)", v);
	int up = opsController->horizontalSlider_dirthr_up->value();
	directionalThreshold(GraphBuffer,s_Buff, GraphTraceLen, v, up);
	g_useOverlays = true;
	RepaintGraphWindow();
}
ProxWidget::ProxWidget(QWidget *parent, ProxGuiQT *master) : QWidget(parent) {
	this->master = master;
	resize(800,500);

	/** Setup the controller widget **/

	controlWidget = new QWidget();
	opsController = new Ui::Form();
	opsController->setupUi(controlWidget);
	//Due to quirks in QT Designer, we need to fiddle a bit
	opsController->horizontalSlider_dirthr_down->setMinimum(-128);
	opsController->horizontalSlider_dirthr_down->setMaximum(0);
	opsController->horizontalSlider_dirthr_down->setValue(-20);
	opsController->horizontalSlider_dirthr_up->setMinimum(-40);
	opsController->horizontalSlider_dirthr_up->setMaximum(128);
	opsController->horizontalSlider_dirthr_up->setValue(20);
	opsController->horizontalSlider_askedge->setValue(25);
	opsController->horizontalSlider_window->setValue(4000);


	QObject::connect(opsController->pushButton_apply, SIGNAL(clicked()), this, SLOT(applyOperation()));
	QObject::connect(opsController->pushButton_sticky, SIGNAL(clicked()), this, SLOT(stickOperation()));
	QObject::connect(opsController->horizontalSlider_window, SIGNAL(valueChanged(int)), this, SLOT(vchange_autocorr(int)));
	QObject::connect(opsController->horizontalSlider_dirthr_up, SIGNAL(valueChanged(int)), this, SLOT(vchange_dthr_up(int)));
	QObject::connect(opsController->horizontalSlider_dirthr_down, SIGNAL(valueChanged(int)), this, SLOT(vchange_dthr_down(int)));
	QObject::connect(opsController->horizontalSlider_askedge, SIGNAL(valueChanged(int)), this, SLOT(vchange_askedge(int)));

	controlWidget->show();

	// Set up the plot widget, which does the actual plotting

	plot = new Plot(this);
	/*
	QSlider* slider = new QSlider(Qt::Horizontal);
	slider->setFocusPolicy(Qt::StrongFocus);
	slider->setTickPosition(QSlider::TicksBothSides);
	slider->setTickInterval(10);
	slider->setSingleStep(1);
	*/
	QVBoxLayout *layout = new QVBoxLayout;
	//layout->addWidget(slider);
	layout->addWidget(plot);
	setLayout(layout);
	//printf("Proxwidget Constructor just set layout\r\n");
}

// not 100% sure what i need in this block
// feel free to fix - marshmellow...
ProxWidget::~ProxWidget(void) {
	if (controlWidget) {
		controlWidget->close();
		delete controlWidget;
		controlWidget = NULL;
	}

	if (opsController) {
		delete opsController;
		opsController = NULL;
	}

	if (plot) {
		plot->close();
		delete plot;
		plot = NULL;
	}
}
void ProxWidget::closeEvent(QCloseEvent *event) {
	event->ignore();
	this->hide();
	g_useOverlays = false;
}
void ProxWidget::hideEvent(QHideEvent *event) {
	controlWidget->hide();
	plot->hide();
}
void ProxWidget::showEvent(QShowEvent *event) {
	controlWidget->show();
	plot->show();
}

//----------- Plotting

int Plot::xCoordOf(int i, QRect r ) {
	return r.left() + (int)((i - GraphStart)*GraphPixelsPerPoint);
}

int Plot::yCoordOf(int v, QRect r, int maxVal) {
	int z = (r.bottom() - r.top())/2;
	return -(z * v) / maxVal + z;
}

int Plot::valueOf_yCoord(int y, QRect r, int maxVal) {
	int z = (r.bottom() - r.top())/2;
	return (y-z) * maxVal / z;
}

static const QColor GREEN = QColor(100,255,100);
static const QColor RED   = QColor(255,100,100);
static const QColor BLUE  = QColor(100,100,255);
static const QColor GRAY = QColor(240,240,240);

QColor Plot::getColor(int graphNum)
{
	switch (graphNum) {
	case 0: return GREEN;  //Green
	case 1: return RED;    //Red
	case 2: return BLUE;   //Blue
	default: return GRAY;  //Gray
	}
}

void Plot::setMaxAndStart(int *buffer, int len, QRect plotRect)
{
	if (len == 0) return;
	startMax = (len - (int)((plotRect.right() - plotRect.left() - 40) / GraphPixelsPerPoint));
	if(startMax < 0) {
		startMax = 0;
	}
	if(GraphStart > startMax) {
		GraphStart = startMax;
	}
	if (GraphStart > len) return;
	int vMin = INT_MAX, vMax = INT_MIN, v = 0;
	int sample_index = GraphStart ;
	for( ; sample_index < len && xCoordOf(sample_index,plotRect) < plotRect.right() ; sample_index++) {

		v = buffer[sample_index];
		if(v < vMin) vMin = v;
		if(v > vMax) vMax = v;
	}

	g_absVMax = 0;
	if(fabs( (double) vMin) > g_absVMax) g_absVMax = (int)fabs( (double) vMin);
	if(fabs( (double) vMax) > g_absVMax) g_absVMax = (int)fabs( (double) vMax);
	g_absVMax = (int)(g_absVMax*1.25 + 1);
}

void Plot::PlotDemod(uint8_t *buffer, size_t len, QRect plotRect, QRect annotationRect, QPainter *painter, int graphNum, int plotOffset)
{
	if (len == 0 || PlotGridX <= 0) return;
	//clock_t begin = clock();
	QPainterPath penPath;

	int grid_delta_x = PlotGridX;
	int first_delta_x = grid_delta_x; //(plotOffset > 0) ? PlotGridX : (PlotGridX +);
	if (GraphStart > plotOffset) first_delta_x -= (GraphStart-plotOffset);
	int DemodStart = GraphStart;
	if (plotOffset > GraphStart) DemodStart = plotOffset;

	int BitStart = 0;
	// round down
	if (DemodStart-plotOffset > 0) BitStart = (int)(((DemodStart-plotOffset)+(PlotGridX-1))/PlotGridX)-1;
	first_delta_x += BitStart * PlotGridX;
	if (BitStart > (int)len) return;
	int delta_x = 0;
	int v = 0;
	//printf("first_delta_x %i, grid_delta_x %i, DemodStart %i, BitStart %i\n",first_delta_x,grid_delta_x,DemodStart, BitStart);

	painter->setPen(getColor(graphNum));
	char str[5];
  int absVMax = (int)(100*1.05+1);
	int x = xCoordOf(DemodStart, plotRect);
	int y = yCoordOf((buffer[BitStart]*200-100)*-1,plotRect,absVMax);
	penPath.moveTo(x, y);
	delta_x = 0;
	int clk = first_delta_x;
	for(int i = BitStart; i < (int)len && xCoordOf(delta_x+DemodStart, plotRect) < plotRect.right(); i++) {
		for (int ii = 0; ii < (clk) && i < (int)len && xCoordOf(DemodStart+delta_x+ii, plotRect) < plotRect.right() ; ii++ ) {
			x = xCoordOf(DemodStart+delta_x+ii, plotRect);
			v = buffer[i]*200-100;

			y = yCoordOf( v, plotRect, absVMax);

			penPath.lineTo(x, y);

			if(GraphPixelsPerPoint > 10) {
				QRect f(QPoint(x - 3, y - 3),QPoint(x + 3, y + 3));
				painter->fillRect(f, QColor(100, 255, 100));
			}
			if (ii == (int)clk/2) {
				//print label
				sprintf(str, "%u",buffer[i]);
				painter->drawText(x-8, y + ((buffer[i] > 0) ? 18 : -6), str);
			}
		}
		delta_x += clk;
		clk = grid_delta_x;
	}

	// Graph annotations
	painter->drawPath(penPath);
}

void Plot::PlotGraph(int *buffer, int len, QRect plotRect, QRect annotationRect, QPainter *painter, int graphNum) {
	if (len == 0) return;
	// clock_t begin = clock();
	QPainterPath penPath;
	int vMin = INT_MAX, vMax = INT_MIN, vMean = 0, v = 0, i = 0;
	int x = xCoordOf(GraphStart, plotRect);
	int y = yCoordOf(buffer[GraphStart],plotRect,g_absVMax);
	penPath.moveTo(x, y);
	for(i = GraphStart; i < len && xCoordOf(i, plotRect) < plotRect.right(); i++) {

		x = xCoordOf(i, plotRect);
		v = buffer[i];

		y = yCoordOf( v, plotRect, g_absVMax);

		penPath.lineTo(x, y);

		if(GraphPixelsPerPoint > 10) {
			QRect f(QPoint(x - 3, y - 3),QPoint(x + 3, y + 3));
			painter->fillRect(f, QColor(100, 255, 100));
		}
		// catch stats
		if(v < vMin) vMin = v;
		if(v > vMax) vMax = v;
		vMean += v;
	}
	vMean /= (i - GraphStart);

	painter->setPen(getColor(graphNum));

	// Draw y-axis
	int xo = 5+(graphNum*40);
	painter->drawLine(xo, plotRect.top(),xo, plotRect.bottom());

	int vMarkers = (g_absVMax - (g_absVMax % 10)) / 5;
	int minYDist = 40; // Minimum pixel-distance between markers

	char yLbl[20];

	int n = 0;
	int lasty0 = 65535;

	for(v = vMarkers; yCoordOf(v,plotRect,g_absVMax) > plotRect.top() && n < 20; v+= vMarkers ,n++)
	{
		int y0 = yCoordOf(v,plotRect,g_absVMax);
		int y1 = yCoordOf(-v,plotRect,g_absVMax);

		if(lasty0 - y0 < minYDist) continue;

		painter->drawLine(xo-5,y0, xo+5, y0);

		sprintf(yLbl, "%d", v);
		painter->drawText(xo+8,y0+7,yLbl);

		painter->drawLine(xo-5, y1, xo+5, y1);
		sprintf(yLbl, "%d",-v);
		painter->drawText(xo+8, y1+5 , yLbl);
		lasty0 = y0;
	}

	//Graph annotations
	painter->drawPath(penPath);
	char str[200];
	sprintf(str, "max=%d  min=%d  mean=%d  n=%d/%d  CursorAVal=[%d]  CursorBVal=[%d]",
			vMax, vMin, vMean, i, len, buffer[CursorAPos], buffer[CursorBPos]);
	painter->drawText(20, annotationRect.bottom() - 23 - 20 * graphNum, str);

	//clock_t end = clock();
	//double elapsed_secs = double(end - begin) / CLOCKS_PER_SEC;
	//printf("Plot time %f\n", elapsed_secs);
}

void Plot::plotGridLines(QPainter* painter,QRect r) {
	// set GridOffset
	if (PlotGridX <= 0) return;
	int offset = GridOffset;
	if (GridLocked && PlotGridX) {
		offset = GridOffset + PlotGridX - (GraphStart % PlotGridX);
	} else if (!GridLocked && GraphStart > 0 && PlotGridX) {
		offset = PlotGridX-((GraphStart - offset) % PlotGridX) + GraphStart - unlockStart;
	}
	offset %= PlotGridX;
	if (offset < 0) offset += PlotGridX;

	int i;
	int grid_delta_x = (int) (PlotGridX * GraphPixelsPerPoint);
	int grid_delta_y = PlotGridY;
	if ((PlotGridX > 0) && ((PlotGridX * GraphPixelsPerPoint) > 1)) {
		for(i = (offset * GraphPixelsPerPoint); i < r.right(); i += grid_delta_x) {
			painter->drawLine(r.left()+i, r.top(), r.left()+i, r.bottom());
		} 
	}
	if (PlotGridY > 0) {
		for(i = 0; yCoordOf(i,r,g_absVMax) > r.top(); i += grid_delta_y) {
			painter->drawLine( r.left(), yCoordOf(i,r,g_absVMax), r.right(), yCoordOf(i,r,g_absVMax) );
			painter->drawLine( r.left(), yCoordOf(i*-1,r,g_absVMax), r.right(), yCoordOf(i*-1,r,g_absVMax) );
		}
	}
}

#define HEIGHT_INFO 60
#define WIDTH_AXES 80

void Plot::paintEvent(QPaintEvent *event)
{
	QPainter painter(this);
	QBrush brush(QColor(100, 255, 100));
	QPen pen(QColor(100, 255, 100));

	painter.setFont(QFont("Courier New", 10));

	if(GraphStart < 0)
		GraphStart = 0;

	if (CursorAPos > GraphTraceLen)
		CursorAPos= 0;
	if (CursorBPos > GraphTraceLen)
		CursorBPos= 0;
	if (CursorCPos > GraphTraceLen)
		CursorCPos= 0;
	if (CursorDPos > GraphTraceLen)
		CursorDPos= 0;

	QRect plotRect(WIDTH_AXES, 0, width()-WIDTH_AXES, height()-HEIGHT_INFO);
	QRect infoRect(0, height()-HEIGHT_INFO, width(), HEIGHT_INFO);

	//Grey background
	painter.fillRect(rect(), QColor(60, 60, 60));
	//Black foreground
	painter.fillRect(plotRect, QColor(0, 0, 0));

	//init graph variables
	setMaxAndStart(GraphBuffer,GraphTraceLen,plotRect);

	// center line
	int zeroHeight = plotRect.top() + (plotRect.bottom() - plotRect.top()) / 2;
	painter.setPen(QColor(100, 100, 100));
	painter.drawLine(plotRect.left(), zeroHeight, plotRect.right(), zeroHeight);
	// plot X and Y grid lines
	plotGridLines(&painter, plotRect);

	//Start painting graph
	PlotGraph(GraphBuffer, GraphTraceLen,plotRect,infoRect,&painter,0);
	if (showDemod && DemodBufferLen	> 8) {
		PlotDemod(DemodBuffer, DemodBufferLen,plotRect,infoRect,&painter,2,g_DemodStartIdx);
	}
	if (g_useOverlays) {
		//init graph variables
		setMaxAndStart(s_Buff,GraphTraceLen,plotRect);
		PlotGraph(s_Buff, GraphTraceLen,plotRect,infoRect,&painter,1);
	}
	// End graph drawing

	//Draw the cursors
	if (CursorAPos > GraphStart && xCoordOf(CursorAPos, plotRect) < plotRect.right()) {
		painter.setPen(QColor(255, 255, 0));
		painter.drawLine(xCoordOf(CursorAPos, plotRect),plotRect.top(),xCoordOf(CursorAPos, plotRect),plotRect.bottom());
	}
	if (CursorBPos > GraphStart && xCoordOf(CursorBPos, plotRect) < plotRect.right()) {
		painter.setPen(QColor(255, 0, 255));
		painter.drawLine(xCoordOf(CursorBPos, plotRect),plotRect.top(),xCoordOf(CursorBPos, plotRect),plotRect.bottom());
	}
	if (CursorCPos > GraphStart && xCoordOf(CursorCPos, plotRect) < plotRect.right()) {
		painter.setPen(QColor(255, 153, 0)); //orange
		painter.drawLine(xCoordOf(CursorCPos, plotRect),plotRect.top(),xCoordOf(CursorCPos, plotRect),plotRect.bottom());
	}
	if (CursorDPos > GraphStart && xCoordOf(CursorDPos, plotRect) < plotRect.right()) {
		painter.setPen(QColor(0, 0, 205)); //light blue
		painter.drawLine(xCoordOf(CursorDPos, plotRect),plotRect.top(),xCoordOf(CursorDPos, plotRect),plotRect.bottom());
	}

	//Draw annotations
	char str[200];
	sprintf(str, "@%d  dt=%d [%2.2f] zoom=%2.2f  CursorAPos=%d  CursorBPos=%d  GridX=%d  GridY=%d (%s) GridXoffset=%d",
			GraphStart,
			CursorBPos - CursorAPos,
			(CursorBPos - CursorAPos)/CursorScaleFactor,
			GraphPixelsPerPoint,
			CursorAPos,
			CursorBPos,
			PlotGridXdefault,
			PlotGridYdefault,
			GridLocked ? "Locked" : "Unlocked",
			GridOffset
		);
	painter.setPen(QColor(255, 255, 255));
	painter.drawText(20, infoRect.bottom() - 3, str);
}

Plot::Plot(QWidget *parent) : QWidget(parent), GraphStart(0), GraphPixelsPerPoint(1)
{
	//Need to set this, otherwise we don't receive keypress events
	setFocusPolicy( Qt::StrongFocus);
	resize(600, 300);

	QPalette palette(QColor(0,0,0,0));
	palette.setColor(QPalette::WindowText, QColor(255,255,255));
	palette.setColor(QPalette::Text, QColor(255,255,255));
	palette.setColor(QPalette::Button, QColor(100, 100, 100));
	setPalette(palette);
	setAutoFillBackground(true);
	CursorAPos = 0;
	CursorBPos = 0;

	setWindowTitle(tr("Sliders"));
}

void Plot::closeEvent(QCloseEvent *event)
{
	event->ignore();
	this->hide();
	g_useOverlays = false;
}

void Plot::mouseMoveEvent(QMouseEvent *event)
{
	int x = event->x();
	x -= WIDTH_AXES;
	x = (int)(x / GraphPixelsPerPoint);
	x += GraphStart;
	if((event->buttons() & Qt::LeftButton)) {
		CursorAPos = x;
	} else if (event->buttons() & Qt::RightButton) {
		CursorBPos = x;
	}
	this->update();
}

void Plot::keyPressEvent(QKeyEvent *event)
{
	int	offset;

	if(event->modifiers() & Qt::ShiftModifier) {
		if (PlotGridX)
			offset= PageWidth - (PageWidth % PlotGridX);
		else
			offset= PageWidth;
	} else 
		if(event->modifiers() & Qt::ControlModifier)
			offset= 1;
		else
			offset= (int)(20 / GraphPixelsPerPoint);

	switch(event->key()) {
		case Qt::Key_Down:
			if(GraphPixelsPerPoint <= 50) {
				GraphPixelsPerPoint *= 2;
			}
			break;

		case Qt::Key_Up:
			if(GraphPixelsPerPoint >= 0.02) {
				GraphPixelsPerPoint /= 2;
			}
			break;

		case Qt::Key_Right:
			if(GraphPixelsPerPoint < 20) {
				GraphStart += offset;
			} else {
				GraphStart++;
			}
			break;

		case Qt::Key_Left:
			if(GraphPixelsPerPoint < 20) {
				GraphStart -= offset;
			} else {
				GraphStart--;
			}
			break;

		case Qt::Key_G:
			if(PlotGridX || PlotGridY) {
				PlotGridX= 0;
				PlotGridY= 0;
			} else {
				PlotGridX= PlotGridXdefault;
				PlotGridY= PlotGridYdefault;
			}
			break;

		case Qt::Key_H:
			puts("Plot Window Keystrokes:\n");
			puts(" Key                      Action\n");
			puts(" DOWN                     Zoom in");
			puts(" G                        Toggle grid display");
			puts(" H                        Show help");
			puts(" L                        Toggle lock grid relative to samples");
			puts(" LEFT                     Move left");
			puts(" <CTL>LEFT                Move left 1 sample");
			puts(" <SHIFT>LEFT              Page left");
			puts(" LEFT-MOUSE-CLICK         Set yellow cursor");
			puts(" Q                        Hide window");
			puts(" RIGHT                    Move right");
			puts(" <CTL>RIGHT               Move right 1 sample");
			puts(" <SHIFT>RIGHT             Page right");
			puts(" RIGHT-MOUSE-CLICK        Set purple cursor");
			puts(" UP                       Zoom out");
			puts("");
			puts("Use client window 'data help' for more plot commands\n");
			break;

		case Qt::Key_L:
			GridLocked = !GridLocked;
			if (GridLocked)
				GridOffset += (GraphStart - unlockStart);
			else
				unlockStart = GraphStart;
			break;

		case Qt::Key_Q:
			this->hide();
			break;

		default:
			QWidget::keyPressEvent(event);
			return;
			break;
	}

	this->update();
}