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#include "qopenkodeintegration.h"
#include "qopenkodewindowsurface.h"
#include "qopenkodewindow.h"
#include "qopenkodeeventloopintegration.h"

#include <QtOpenGL/private/qpixmapdata_gl_p.h>
#include <QtOpenGL/private/qwindowsurface_gl_p.h>

#include <QtGui/private/qpixmap_raster_p.h>

#include <QtCore/qdebug.h>
#include <QtCore/qthread.h>
#include <QtCore/qfile.h>

#include <KD/kd.h>
#include <KD/NV_display.h>
#include <KD/NV_initialize.h>

#include <EGL/egl.h>

#include "GLES2/gl2ext.h"

#include <nvgl2demo_common.h>


QT_BEGIN_NAMESPACE

QOpenKODEScreen::QOpenKODEScreen()
{
    KDDesktopNV *kdDesktop = KD_NULL;
    KDDisplayNV *kdDisplay = KD_NULL;

    qDebug() << "QOpenKODEScreen::QOpenKODEIntegrationScreen()";

    // Get the default desktop and display
    kdDesktop = kdGetDesktopNV(KD_DEFAULT_DESKTOP_NV, KD_NULL);
    if (!kdDesktop || kdDesktop == (void*)-1) {
        qErrnoWarning(kdGetError(), "Could not obtain KDDesktopNV pointer");
        return;
    }

    kdDisplay = kdGetDisplayNV(KD_DEFAULT_DISPLAY_NV, KD_NULL);
    if (!kdDisplay || kdDisplay == (void*)-1) {
        qErrnoWarning(kdGetError(), "Could not obtain KDDisplayNV pointer");
        kdReleaseDesktopNV(kdDesktop);
        return;
    }

    KDboolean enabled = KD_TRUE;
    kdSetDisplayPropertybvNV(kdDisplay,
                             KD_DISPLAYPROPERTY_ENABLED_NV,
                             &enabled);
    KDboolean power = KD_DISPLAY_POWER_ON;
    kdSetDisplayPropertyivNV(kdDisplay,
                             KD_DISPLAYPROPERTY_POWER_NV,
                             &power);

    kdSetDisplayPropertycvNV(kdDisplay,
                             KD_DISPLAYPROPERTY_DESKTOP_NAME_NV,
                             KD_DEFAULT_DESKTOP_NV);

    KDDisplayModeNV mode;
    if (kdGetDisplayModeNV(kdDisplay, &mode)) {
        qErrnoWarning(kdGetError(), "Could not get display mode");
        return;
    }

    qDebug() << " - display mode " << mode.width << "x" << mode.height << " refresh " << mode.refresh;

    KDint desktopSize[] = { mode.width, mode.height };

    if (kdSetDesktopPropertyivNV(kdDesktop, KD_DESKTOPPROPERTY_SIZE_NV, desktopSize)) {
        qErrnoWarning(kdGetError(), "Could not set desktop size");
        return;
    }

    // Once we've set up the desktop and display we don't need them anymore
    kdReleaseDisplayNV(kdDisplay);
    kdReleaseDesktopNV(kdDesktop);

    mEglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    if (mEglDisplay == EGL_NO_DISPLAY) {
        qErrnoWarning("EGL failed to obtain display");
    }

    /* Initialize EGL display */
    EGLBoolean rvbool = eglInitialize(mEglDisplay, 0, 0);
    if (!rvbool) {
        qErrnoWarning("EGL failed to initialize display");
    }

    const int defaultDpi = 72;
    mGeometry = QRect(0, 0, mode.width, mode.height);
    mPhysicalSize = QSize(mode.width * 25.4 / defaultDpi, mode.height * 25.4 / defaultDpi);

    mDepth = 24;
    mFormat = QImage::Format_RGB32;
}

static GLuint loadShaders(const QString &vertexShader, const QString &fragmentShader)
{
    GLuint prog = 0;
    GLuint vertShader;
    GLuint fragShader;

   // Create the program
    prog = glCreateProgram();

    // Create the GL shader objects
    vertShader = glCreateShader(GL_VERTEX_SHADER);
    fragShader = glCreateShader(GL_FRAGMENT_SHADER);

    // Load shader sources into GL and compile
    QFile vertexFile(vertexShader);
    vertexFile.open(QFile::ReadOnly);
    QByteArray vertSource = vertexFile.readAll();
    const char *vertChar = vertSource.constData();
    int vertSize = vertSource.size();

    QFile fragFile(fragmentShader);
    fragFile.open(QFile::ReadOnly);
    QByteArray fragSource = fragFile.readAll();
    const char *fragChar = fragSource.constData();
    int fragSize = fragSource.size();

    glShaderSource(vertShader, 1, (const char**)&vertChar, &vertSize);
    glCompileShader(vertShader);

    glShaderSource(fragShader, 1, (const char**)&fragChar, &fragSize);
    glCompileShader(fragShader);

    // Attach the shaders to the program
    glAttachShader(prog, vertShader);
    glAttachShader(prog, fragShader);

    // Delete the shaders
    glDeleteShader(vertShader);
    glDeleteShader(fragShader);

    // Link and validate the shader program
    glLinkProgram(prog);
    glValidateProgram(prog);

    return prog;
}

QOpenKODEIntegration::QOpenKODEIntegration()
{
    if (kdInitializeNV() == KD_ENOTINITIALIZED) {
        qFatal("Did not manage to initialize openkode");
    }
    QOpenKODEScreen *mPrimaryScreen = new QOpenKODEScreen();

    mScreens.append(mPrimaryScreen);

}

QPixmapData *QOpenKODEIntegration::createPixmapData(QPixmapData::PixelType type) const
{
    return new QGLPixmapData(type);
}

QPlatformWindow *QOpenKODEIntegration::createPlatformWindow(QWidget *tlw, WId ) const
{
    return new QOpenKODEWindow(tlw);
}

QWindowSurface *QOpenKODEIntegration::createWindowSurface(QWidget *widget, WId wid) const
{
    QWindowSurface *returnSurface = 0;
    switch (widget->platformWindowFormat().windowApi()) {

    case QPlatformWindowFormat::Raster:
        returnSurface = new QOpenKODEWindowSurface(widget, wid);
        break;

    case QPlatformWindowFormat::OpenGL:
        returnSurface = new QGLWindowSurface(widget);
        break;

    case QPlatformWindowFormat::OpenVG:
//        returnSurface = new QVGWindowSurface(widget);
        break;

    default:
        returnSurface = new QGLWindowSurface(widget);
        break;
    }

    return returnSurface;
}

bool QOpenKODEIntegration::hasOpenGL() const
{
    return true;
}

QPlatformEventLoopIntegration *QOpenKODEIntegration::createEventLoopIntegration() const
{
    return new QOpenKODEEventLoopIntegration;
}

GLuint QOpenKODEIntegration::blitterProgram()
{
    static GLuint shaderProgram = 0;
    if (!shaderProgram) {

        shaderProgram = loadShaders(":/shaders/vert.glslv",":/shaders/frag.glslf");
        if (!shaderProgram)
            qFatal("QOpenKodeGraphicsSystem(): Cannot load shaders!");
    }
    return shaderProgram;
}


QT_END_NAMESPACE