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#include <QtGui/QWindow>
#include <QtGui/QOpenGLContext>
#include <QtGui/QOffscreenSurface>
#include <QtGui/QGuiApplication>
#include <QtGui/private/qguiapplication_p.h>
#include <qpa/qwindowsysteminterface.h>
#include <qpa/qplatforminputcontextfactory_p.h>

#include <QtPlatformSupport/private/qgenericunixfontdatabase_p.h>
#include <QtPlatformSupport/private/qgenericunixservices_p.h>
#include <QtPlatformSupport/private/qgenericunixeventdispatcher_p.h>
#include <QtPlatformSupport/private/qfbvthandler_p.h>
#include <QtPlatformSupport/private/qopenglcompositorbackingstore_p.h>

#if !defined(QT_NO_EVDEV) && (!defined(Q_OS_ANDROID) || defined(Q_OS_ANDROID_NO_SDK))
#include <QtPlatformSupport/private/qevdevmousemanager_p.h>
#include <QtPlatformSupport/private/qevdevkeyboardmanager_p.h>
#include <QtPlatformSupport/private/qevdevtouch_p.h>
#endif

#if !defined(QT_NO_TSLIB) && (!defined(Q_OS_ANDROID) || defined(Q_OS_ANDROID_NO_SDK))
#include <QtPlatformSupport/private/qtslib_p.h>
#endif

#include <QtPlatformHeaders/qeglfsfunctions.h>

#include "qeglplatformintegration_p.h"
#include "qeglplatformcontext_p.h"
#include "qeglplatformwindow_p.h"
#include "qeglplatformscreen_p.h"
#include "qeglplatformcursor_p.h"

QT_BEGIN_NAMESPACE

/*!
    \class QEGLPlatformIntegration
    \brief Base class for EGL-based QPlatformIntegration implementations.
    \since 5.2
    \internal
    \ingroup qpa

    This class provides most of the necessary platform integration for
    an EGL-based Unix system. Platform plugins must subclass this and
    reimplement the virtuals for creating platform screens and windows
    since they will most likely wish to use a subclass for these.

    The backing store, native interface accessors, font database,
    basic capability flags, etc. are provided out of the box, no
    further customization is needed.

    \note It is critical that this class' implementation of
    initialize() is called. Therefore subclasses should either avoid
    to reimplement this function or call the base class
    implementation.
 */

QEGLPlatformIntegration::QEGLPlatformIntegration()
    : m_display(EGL_NO_DISPLAY),
      m_inputContext(0),
      m_fontDb(new QGenericUnixFontDatabase),
      m_services(new QGenericUnixServices),
      m_kbdMgr(0)
{
}

QEGLPlatformIntegration::~QEGLPlatformIntegration()
{
}

void QEGLPlatformIntegration::initialize()
{
    m_display = eglGetDisplay(nativeDisplay());
    if (m_display == EGL_NO_DISPLAY)
        qFatal("Could not open egl display");

    EGLint major, minor;
    if (!eglInitialize(m_display, &major, &minor))
        qFatal("Could not initialize egl display");

    m_inputContext = QPlatformInputContextFactory::create();

    m_vtHandler.reset(new QFbVtHandler);
}

void QEGLPlatformIntegration::destroy()
{
    foreach (QWindow *w, qGuiApp->topLevelWindows())
        w->destroy();

    if (m_display != EGL_NO_DISPLAY)
        eglTerminate(m_display);
}

QAbstractEventDispatcher *QEGLPlatformIntegration::createEventDispatcher() const
{
    return createUnixEventDispatcher();
}

QPlatformServices *QEGLPlatformIntegration::services() const
{
    return m_services.data();
}

QPlatformFontDatabase *QEGLPlatformIntegration::fontDatabase() const
{
    return m_fontDb.data();
}

QPlatformBackingStore *QEGLPlatformIntegration::createPlatformBackingStore(QWindow *window) const
{
    QOpenGLCompositorBackingStore *bs = new QOpenGLCompositorBackingStore(window);
    static_cast<QEGLPlatformWindow *>(window->handle())->setBackingStore(bs);
    return bs;
}

QPlatformWindow *QEGLPlatformIntegration::createPlatformWindow(QWindow *window) const
{
    QWindowSystemInterface::flushWindowSystemEvents();
    QEGLPlatformWindow *w = createWindow(window);
    w->create();
    if (window->type() != Qt::ToolTip)
        w->requestActivateWindow();
    return w;
}

QPlatformOpenGLContext *QEGLPlatformIntegration::createPlatformOpenGLContext(QOpenGLContext *context) const
{
    // If there is a "root" window into which raster and QOpenGLWidget content is
    // composited, all other contexts must share with its context.
    QOpenGLContext *compositingContext = QOpenGLCompositor::instance()->context();
    QPlatformOpenGLContext *share = compositingContext ? compositingContext->handle() : context->shareHandle();
    QVariant nativeHandle = context->nativeHandle();
    QPlatformOpenGLContext *platformContext = createContext(context->format(),
                                                            share,
                                                            display(),
                                                            &nativeHandle);
    context->setNativeHandle(nativeHandle);
    return platformContext;
}

QPlatformOffscreenSurface *QEGLPlatformIntegration::createPlatformOffscreenSurface(QOffscreenSurface *surface) const
{
    QEGLPlatformScreen *screen = static_cast<QEGLPlatformScreen *>(surface->screen()->handle());
    return createOffscreenSurface(screen->display(), surface->requestedFormat(), surface);
}

bool QEGLPlatformIntegration::hasCapability(QPlatformIntegration::Capability cap) const
{
    switch (cap) {
    case ThreadedPixmaps: return true;
    case OpenGL: return true;
    case ThreadedOpenGL: return true;
    case WindowManagement: return false;
    case RasterGLSurface: return true;
    default: return QPlatformIntegration::hasCapability(cap);
    }
}

QPlatformNativeInterface *QEGLPlatformIntegration::nativeInterface() const
{
    return const_cast<QEGLPlatformIntegration *>(this);
}

enum ResourceType {
    EglDisplay,
    EglWindow,
    EglContext,
    EglConfig,
    NativeDisplay,
    XlibDisplay
};

static int resourceType(const QByteArray &key)
{
    static const QByteArray names[] = { // match ResourceType
        QByteArrayLiteral("egldisplay"),
        QByteArrayLiteral("eglwindow"),
        QByteArrayLiteral("eglcontext"),
        QByteArrayLiteral("eglconfig"),
        QByteArrayLiteral("nativedisplay"),
        QByteArrayLiteral("display")
    };
    const QByteArray *end = names + sizeof(names) / sizeof(names[0]);
    const QByteArray *result = std::find(names, end, key);
    if (result == end)
        result = std::find(names, end, key.toLower());
    return int(result - names);
}

void *QEGLPlatformIntegration::nativeResourceForIntegration(const QByteArray &resource)
{
    void *result = 0;

    switch (resourceType(resource)) {
    case EglDisplay:
        result = display();
        break;
    case NativeDisplay:
        result = reinterpret_cast<void*>(nativeDisplay());
        break;
    default:
        break;
    }

    return result;
}

void *QEGLPlatformIntegration::nativeResourceForScreen(const QByteArray &resource, QScreen *)
{
    void *result = 0;

    switch (resourceType(resource)) {
    case XlibDisplay:
        // Play nice when using the x11 hooks: Be compatible with xcb that allows querying
        // the X Display pointer, which is nothing but our native display.
        result = reinterpret_cast<void*>(nativeDisplay());
        break;
    default:
        break;
    }

    return result;
}

void *QEGLPlatformIntegration::nativeResourceForWindow(const QByteArray &resource, QWindow *window)
{
    void *result = 0;

    switch (resourceType(resource)) {
    case EglDisplay:
        if (window && window->handle())
            result = static_cast<QEGLPlatformScreen *>(window->handle()->screen())->display();
        else
            result = display();
        break;
    case EglWindow:
        if (window && window->handle())
            result = reinterpret_cast<void*>(static_cast<QEGLPlatformWindow *>(window->handle())->eglWindow());
        break;
    default:
        break;
    }

    return result;
}

void *QEGLPlatformIntegration::nativeResourceForContext(const QByteArray &resource, QOpenGLContext *context)
{
    void *result = 0;

    switch (resourceType(resource)) {
    case EglContext:
        if (context->handle())
            result = static_cast<QEGLPlatformContext *>(context->handle())->eglContext();
        break;
    case EglConfig:
        if (context->handle())
            result = static_cast<QEGLPlatformContext *>(context->handle())->eglConfig();
        break;
    case EglDisplay:
        if (context->handle())
            result = static_cast<QEGLPlatformContext *>(context->handle())->eglDisplay();
        break;
    default:
        break;
    }

    return result;
}

static void *eglContextForContext(QOpenGLContext *context)
{
    Q_ASSERT(context);

    QEGLPlatformContext *handle = static_cast<QEGLPlatformContext *>(context->handle());
    if (!handle)
        return 0;

    return handle->eglContext();
}

QPlatformNativeInterface::NativeResourceForContextFunction QEGLPlatformIntegration::nativeResourceFunctionForContext(const QByteArray &resource)
{
    QByteArray lowerCaseResource = resource.toLower();
    if (lowerCaseResource == "get_egl_context")
        return NativeResourceForContextFunction(eglContextForContext);

    return 0;
}

QFunctionPointer QEGLPlatformIntegration::platformFunction(const QByteArray &function) const
{
#if !defined(QT_NO_EVDEV) && (!defined(Q_OS_ANDROID) || defined(Q_OS_ANDROID_NO_SDK))
    if (function == QEglFSFunctions::loadKeymapTypeIdentifier())
        return QFunctionPointer(loadKeymapStatic);
#else
    Q_UNUSED(function)
#endif

    return 0;
}

void QEGLPlatformIntegration::loadKeymapStatic(const QString &filename)
{
#if !defined(QT_NO_EVDEV) && (!defined(Q_OS_ANDROID) || defined(Q_OS_ANDROID_NO_SDK))
    QEGLPlatformIntegration *self = static_cast<QEGLPlatformIntegration *>(QGuiApplicationPrivate::platformIntegration());
    if (self->m_kbdMgr)
        self->m_kbdMgr->loadKeymap(filename);
    else
        qWarning("QEGLPlatformIntegration: Cannot load keymap, no keyboard handler found");
#else
    Q_UNUSED(filename);
#endif
}

void QEGLPlatformIntegration::createInputHandlers()
{
#if !defined(QT_NO_EVDEV) && (!defined(Q_OS_ANDROID) || defined(Q_OS_ANDROID_NO_SDK))
    m_kbdMgr = new QEvdevKeyboardManager(QLatin1String("EvdevKeyboard"), QString() /* spec */, this);
    QEvdevMouseManager *mouseMgr = new QEvdevMouseManager(QLatin1String("EvdevMouse"), QString() /* spec */, this);
    Q_FOREACH (QScreen *screen, QGuiApplication::screens()) {
        QEGLPlatformCursor *cursor = qobject_cast<QEGLPlatformCursor *>(screen->handle()->cursor());
        if (cursor)
            cursor->setMouseDeviceDiscovery(mouseMgr->deviceDiscovery());
    }
#ifndef QT_NO_TSLIB
    const bool useTslib = qEnvironmentVariableIntValue("QT_QPA_EGLFS_TSLIB");
    if (useTslib)
        new QTsLibMouseHandler(QLatin1String("TsLib"), QString() /* spec */);
    else
#endif // QT_NO_TSLIB
        new QEvdevTouchScreenHandlerThread(QString() /* spec */, this);
#endif
}

QT_END_NAMESPACE