////////////////////////////////////////////////////////////////////////////////////////////////////
// NoesisGUI - http://www.noesisengine.com
// Copyright (c) 2013 Noesis Technologies S.L. All Rights Reserved.
////////////////////////////////////////////////////////////////////////////////////////////////////


// This is a minimal integration example. For simplification purposes only basic input events are
// handled, no resource providers are used and the shutdown procedure is omitted. A more complete
// multiplatform integration sample with step by step comments can be found at 'Samples/Integration'


#ifdef _WIN32
#include "glut.h"
#pragma comment(linker,"/SUBSYSTEM:CONSOLE")
#endif

#ifdef __APPLE__
#include <GLUT/glut.h>
#endif

#ifdef __EMSCRIPTEN__
#include <GL/glut.h>
#include <GLES3/gl32.h>
#include <emscripten/html5.h>
#endif

#ifdef __linux__
#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glut.h>
#endif

#ifdef _MSC_VER
#define UNUSED_ARGS(...) (void)(true ? (void)0 : ((void)(__VA_ARGS__)))
#else
#define UNUSED_ARGS(...)
#endif


#include <NsApp/ThemeProviders.h>
#include <NsRender/GLFactory.h>
#include <NsGui/FontProperties.h>
#include <NsGui/IntegrationAPI.h>
#include <NsGui/IRenderer.h>
#include <NsGui/IView.h>
#include <NsGui/Grid.h>
#include <NsCore/HighResTimer.h>

#include <list>

static Noesis::Ptr<Noesis::RenderDevice> _device;
static std::list<Noesis::IView*> _views;


///////////////////////////////////////////////////////////////////////////////////////////////////
static void NoesisInit()
{
    // A logging handler is installed here. You can also install a custom error handler and memory
    // allocator. By default errors are redirected to the logging handler
    Noesis::GUI::SetLogHandler([](const char*, uint32_t, uint32_t level, const char*, const char* msg)
        {
            // [TRACE] [DEBUG] [INFO] [WARNING] [ERROR]
            const char* prefixes[] = { "T", "D", "I", "W", "E" };
            printf("[NOESIS/%s] %s\n", prefixes[level], msg);
        });

    // https://www.noesisengine.com/docs/Gui.Core.Licensing.html
    Noesis::GUI::SetLicense("test", "DdcLQLOdC0BP5u4nYEGeHrB9wOVx63HR9/tSn75mF1d45M3x");

    // Noesis initialization. This must be the first step before using any NoesisGUI functionality
    Noesis::GUI::Init();

    _device = NoesisApp::GLFactory::CreateDevice(false);

    // Setup theme
    NoesisApp::SetThemeProviders();
    Noesis::GUI::LoadApplicationResources("Theme/NoesisTheme.DarkBlue.xaml");
}

static void CreateBackground()
{
    // For simplicity purposes we are not using resource providers in this sample. ParseXaml() is
    // enough if there is no extra XAML dependencies
    Noesis::Ptr<Noesis::Grid> xaml(Noesis::GUI::ParseXaml<Noesis::Grid>(R"(<?xml version="1.0" encoding="UTF-8"?>
<Grid 
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
	xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
	xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" 
	xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
	xmlns:noesis="clr-namespace:NoesisGUIExtensions;assembly=Noesis.GUI.Extensions">

    <Grid Grid.Column="0">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="30"/>
            <ColumnDefinition Width="54"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="30"/>
            <RowDefinition Height="11"/>
            <RowDefinition Height="50"/>
        </Grid.RowDefinitions>
        <Button Grid.Column="1" Grid.Row="1" Content="Test" />
    </Grid>
</Grid>
    )"));

    // View creation to render and interact with the user interface
    // We transfer the ownership to a global pointer instead of a Ptr<> because there is no way
    // in GLUT to do shutdown and we don't want the Ptr<> to be released at global time
    Noesis::IView* view = Noesis::GUI::CreateView(xaml).GiveOwnership();
    view->SetFlags(Noesis::RenderFlags_PPAA | Noesis::RenderFlags_LCD);
    view->SetSize(glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT));

    // Renderer initialization with an OpenGL device
    view->GetRenderer()->Init(_device);

    _views.push_back(view);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
static void DisplayFunc(void)
{
    glViewport(0, 0, glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT));
    glDisable(GL_SCISSOR_TEST);
    glClearColor(0.0f, 0.0f, 0.25f, 0.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

    for (auto& view : _views)
    {
        // Update view (layout, animations, ...)
        view->Update(glutGet(GLUT_ELAPSED_TIME) / 1000.0);

        // Offscreen rendering phase populates textures needed by the on-screen rendering
        view->GetRenderer()->UpdateRenderTree();
        view->GetRenderer()->RenderOffscreen();
    }

    // My custom render, goes here...
    // My custom render, goes here...
    // My custom render, goes here...
    // My custom render, goes here...

    for (auto& view : _views)
    {
        // If you are going to render here with your own engine you need to restore the GPU state
        // because noesis changes it. In this case only framebuffer and viewport need to be restored
        glBindFramebuffer(GL_FRAMEBUFFER, 0);

        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
        glClearStencil(0);

        // Rendering is done in the active framebuffer
        view->GetRenderer()->Render();
    }

    glutSwapBuffers();
    glutPostRedisplay();
}

////////////////////////////////////////////////////////////////////////////////////////////////////
static void ReshapeFunc(int width, int height)
{
    for (auto& view : _views)
    {
        view->SetSize(width, height);
    }
}

////////////////////////////////////////////////////////////////////////////////////////////////////
static void MouseMoveFunc(int x, int y)
{
    for (auto& view : _views)
    {
        view->MouseMove(x, y);
    }
}

////////////////////////////////////////////////////////////////////////////////////////////////////
static void MouseFunc(int button, int state, int x, int y)
{
    if (button == GLUT_LEFT_BUTTON)
    {
        if (state == GLUT_DOWN)
        {
            for (auto& view : _views)
            {
                view->MouseButtonDown(x, y, Noesis::MouseButton_Left);
            }
        }
        else
        {
            for (auto& view : _views)
            {
                view->MouseButtonUp(x, y, Noesis::MouseButton_Left);
            }
        }
    }
}

////////////////////////////////////////////////////////////////////////////////////////////////////
int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_STENCIL);
    glutInitWindowSize(1000, 600);

#ifdef __EMSCRIPTEN__
    double width, height;
    emscripten_get_element_css_size("#canvas", &width, &height);
    emscripten_set_canvas_element_size("#canvas", (uint32_t)width, (uint32_t)height);
    glutInitWindowSize((uint32_t)width, (uint32_t)height);
#endif

    glutCreateWindow("NoesisGUI - GLUT integration");
    NoesisInit();

    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();
    CreateBackground();

    glutDisplayFunc(&DisplayFunc);
    glutReshapeFunc(&ReshapeFunc);
    glutPassiveMotionFunc(&MouseMoveFunc);
    glutMouseFunc(&MouseFunc);

    glutMainLoop();

    return 0;
}