/**************************************************************************************************************************************
* Project:       discoverpixy
* Website:       https://github.com/t-moe/discoverpixy
* Authors:       Aaron Schmocker, Timo Lang
* Institution:   BFH Bern University of Applied Sciences
* File:          emulator/qt/mainwindow.cpp
*
* Version History:
* Date			Autor Email			SHA		Changes
* 2015-04-03	timolang@gmail.com	51089aa	Refactored Project Structure for use with emulator
* 2015-04-03	timolang@gmail.com	1f2af9f	Added more tft functions to common and emulator. Fixed eventloop.
* 2015-04-03	timolang@gmail.com	c570bda	Fixed bug in color conversion
* 2015-04-03	timolang@gmail.com	867f766	Some gui changes.
* 2015-04-03	timolang@gmail.com	1aa9194	Fixed Drawing of rects in Emulator. Got frames from pixy to emulator. Slooooow.
* 2015-04-04	timolang@gmail.com	0636381	Improved tff_draw_bitmap_unscaled in emulator.
* 2015-04-27	timolang@gmail.com	259d446	Added touch support to emulator. Implemented basic touch function.
* 2015-04-27	aaron@duckpond.ch	aed90ef	Drawcircle added (emulator)
* 2015-04-27	timolang@gmail.com	e249fb2	Added font support
* 2015-05-09	timolang@gmail.com	c652b6b	Improved Emulator Gui
* 2015-05-25	timolang@gmail.com	911760e	Added "Mouse Position"-Label to Emulator.
* 2015-06-01	timolang@gmail.com	06227da	Added calibrate screen (WIP). fixed bug in emulator drawing.
* 2015-06-07	timolang@gmail.com	4b5768c	Improved Comments in whole emulator. Finalized emulator section in docu.
* 2015-06-07	timolang@gmail.com	8752356	Started with tests in docu. fixed a small bug in emulator when drawing a rectangle.
*
**************************************************************************************************************************************/

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QPainter>
#include <math.h>
#include <QMouseEvent>

extern "C" {
#include "touch.h"
#include "tft.h"
}

#define DISPLAY_WIDTH 320
#define DISPLAY_HEIGHT 240

//function to calculate QColor out of a RGB565 16bit color
QColor QColorFromRGB565(uint16_t color)
{
    //interpolate colors
    int R8 = (int) floor((color >> (5 + 6)) * 255.0 / 31.0 + 0.5);
    int G8 = (int) floor(((color >> 5) & 0x3F) * 255.0 / 63.0 + 0.5);
    int B8 = (int) floor((color & 0x1F) * 255.0 / 31.0 + 0.5);
    return QColor::fromRgb(R8, G8, B8);
}

//function to calculate QRgb out of a RGB565 16bit color
QRgb QRgbFromRGB565(uint16_t color)
{
    //interpolate colors
    int R8 = (int) floor((color >> (5 + 6)) * 255.0 / 31.0 + 0.5);
    int G8 = (int) floor(((color >> 5) & 0x3F) * 255.0 / 63.0 + 0.5);
    int B8 = (int) floor((color & 0x1F) * 255.0 / 31.0 + 0.5);
    return qRgb(R8, G8, B8);
}


MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent), image(DISPLAY_WIDTH, DISPLAY_HEIGHT, QImage::Format_RGB16), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    image.fill(Qt::black); //clear display buffer
    currentScale = 1; //start with scale factor 1
    ui->widgetDisplay->setMouseTracking(true); //enable mouse move events, even when mouse is not pressed
    ui->widgetDisplay->installEventFilter(this); //install event filter for "display" widget, so that we receive those events as well
}

void MainWindow::draw_line(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
{
    QPainter painter(&(image));
    painter.setPen(QColorFromRGB565(color));
    painter.drawLine(x1, y1, x2, y2);
    update();
}

void MainWindow::draw_pixel(uint16_t x, uint16_t y, uint16_t color)
{
    image.setPixel(x, y, QRgbFromRGB565(color));
    update();
}

void MainWindow::clear(uint16_t color)
{
    image.fill(QColorFromRGB565(color));
    update();
}

void MainWindow::draw_rectangle(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
{
    QPainter painter(&(image));
    painter.setPen(QColorFromRGB565(color));
    painter.drawRect(qMin(x1, x2), qMin(y1, y2), abs((int)x2 - (int)x1), abs((int)y2 - (int)y1));
    update();
}

void MainWindow::fill_rectangle(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
{
    QPainter painter(&(image));
    painter.fillRect(qMin(x1, x2), qMin(y1, y2), abs((int)x2 - (int)x1) + 1, abs((int)y2 - (int)y1) + 1, QColorFromRGB565(color));
    update();
}

void MainWindow::draw_bitmap_unscaled(uint16_t x, uint16_t y, uint16_t width, uint16_t height, const uint16_t* dat)
{
    //Creating a new image and access it directly is faster than setPixel
    QImage img(width, height, QImage::Format_RGB32); //create a new image

    for (int yi = 0; yi < height; yi++) { //for each line
        uint32_t* line = (uint32_t*)img.scanLine(yi); //get the pointer to the imagedata of the current line

        for (int xi = 0; xi < width; xi++) { //for each column
            *line++ = QRgbFromRGB565(dat[yi * width + xi]); //set pixel
        }
    }

    QPainter p(&image);
    p.drawImage(x, y, img); //draw created image
    update();
}

void MainWindow::draw_circle(uint16_t x, uint16_t y, uint16_t r, uint16_t color)
{
    QPainter painter(&(image));
    painter.setPen(QColorFromRGB565(color));
    painter.drawEllipse(QPoint(x, y), r, r);
    update();
}

void MainWindow::draw_char(uint16_t x, uint16_t y, uint16_t color, uint16_t bgcolor, QFont font, char c)
{
    QPainter painter(&(image));
    painter.setFont(font);

    if (bgcolor != TRANSPARENT) { //background color is not transparent
        painter.setBackgroundMode(Qt::OpaqueMode);
        painter.setBackground(QColorFromRGB565(bgcolor)); //set text background
    }

    painter.setPen(QColorFromRGB565(color)); //set fontcolor
    y += QFontMetrics(font).ascent(); //use y pos as highest point of char, instead of baseline
    painter.drawText(QPoint(x, y), QString(QChar(c))); //draw char
    update();
}

void MainWindow::paintEvent(QPaintEvent*)
{
    //this method is called whenever the window needs to be redrawn (or after update() is called)
    QPainter painter(this);

    //Create a QRectF which represents the rectangle to draw the buffered image to
    QRectF imgRect(ui->widgetDisplay->geometry().topLeft(), QSizeF(DISPLAY_WIDTH * currentScale, DISPLAY_HEIGHT * currentScale));

    painter.drawImage(imgRect, image); //draw buffer
    painter.setPen(QPen(Qt::green, 2)); //set border color
    painter.drawRect(imgRect.adjusted(-1, -1, 1, 1)); //draw border
}

void MainWindow::mousePressEvent(QMouseEvent* evt)
{
    //the mouse was pressed
    checkAndSendEvent(evt->pos(), true);
}

void MainWindow::mouseReleaseEvent(QMouseEvent* evt)
{
    //the mouse was released
    checkAndSendEvent(evt->pos(), false);
}

void MainWindow::mouseMoveEvent(QMouseEvent* evt)
{
    //the mouse was released
    checkAndSendEvent(evt->pos(), true);
}


bool MainWindow::eventFilter(QObject* obj, QEvent* evt)
{
    if (obj == ui->widgetDisplay) { //we received a redirect event from the target rectangle
        switch (evt->type()) {
        case QEvent::MouseMove: { //it's a mouse move event
            QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(evt); //get mouse event
            QPoint p = (mouseEvent->pos() - QPoint(1, 1)) / currentScale; //calculate correct corrdinates (undo scale)

            if (p.x() < DISPLAY_WIDTH && p.y() < DISPLAY_HEIGHT) { //mouse position not out of bounds
                //set mouse position text
                ui->txtMousePos->setText(QString("Mouse Position: (%1,%2)").arg(p.x()).arg(p.y()));
            }
        }
        break;

        default:
            break;
        }
    }

    return false;
}


MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::checkAndSendEvent(QPoint pos, bool down)
{
    QPoint p = pos - ui->widgetDisplay->geometry().topLeft(); //make coordinate relative to target area (0,0)
    p /= currentScale; //undo scaling

    if (p.x() < 0 || p.y() < 0 || p.x() >= DISPLAY_WIDTH || p.y() >= DISPLAY_HEIGHT) {
        return;    //abort if out of bounds
    }

    touch_add_raw_event(p.x(), p.y(), down ? TOUCH_DOWN : TOUCH_UP); //submit touch event to touch module (common)
}


void MainWindow::on_cboZoom_currentIndexChanged(int index)
{
    currentScale = index + 1; //zoom factor 1 is the 0th entry, zoom factor 2 is the 1st entry, zoom factor 3 is the 2nd entry
    update(); //force redraw
}