/*************************************************************************/
/*  app.cpp                                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
//
// This file demonstrates how to initialize EGL in a Windows Store app, using ICoreWindow.
//

#include "app.h"

#include "main/main.h"
#include "core/os/dir_access.h"
#include "core/os/file_access.h"
#include "core/os/keyboard.h"

#include "platform/windows/key_mapping_win.h"

#include <collection.h>

using namespace Windows::ApplicationModel::Core;
using namespace Windows::ApplicationModel::Activation;
using namespace Windows::UI::Core;
using namespace Windows::UI::Input;
using namespace Windows::Devices::Input;
using namespace Windows::UI::Xaml::Input;
using namespace Windows::Foundation;
using namespace Windows::Graphics::Display;
using namespace Windows::System;
using namespace Windows::System::Threading::Core;
using namespace Microsoft::WRL;

using namespace GodotUWP;

// Helper to convert a length in device-independent pixels (DIPs) to a length in physical pixels.
inline float ConvertDipsToPixels(float dips, float dpi)
{
    static const float dipsPerInch = 96.0f;
    return floor(dips * dpi / dipsPerInch + 0.5f); // Round to nearest integer.
}

// Implementation of the IFrameworkViewSource interface, necessary to run our app.
ref class GodotUWPViewSource sealed : Windows::ApplicationModel::Core::IFrameworkViewSource
{
public:
    virtual Windows::ApplicationModel::Core::IFrameworkView^ CreateView()
    {
        return ref new App();
    }
};

// The main function creates an IFrameworkViewSource for our app, and runs the app.
[Platform::MTAThread]
int main(Platform::Array<Platform::String^>^)
{
    auto godotApplicationSource = ref new GodotUWPViewSource();
    CoreApplication::Run(godotApplicationSource);
    return 0;
}

App::App() :
    mWindowClosed(false),
    mWindowVisible(true),
    mWindowWidth(0),
    mWindowHeight(0),
    mEglDisplay(EGL_NO_DISPLAY),
    mEglContext(EGL_NO_CONTEXT),
    mEglSurface(EGL_NO_SURFACE),
	number_of_contacts(0)
{
}

// The first method called when the IFrameworkView is being created.
void App::Initialize(CoreApplicationView^ applicationView)
{
    // Register event handlers for app lifecycle. This example includes Activated, so that we
    // can make the CoreWindow active and start rendering on the window.
    applicationView->Activated +=
        ref new TypedEventHandler<CoreApplicationView^, IActivatedEventArgs^>(this, &App::OnActivated);

    // Logic for other event handlers could go here.
    // Information about the Suspending and Resuming event handlers can be found here:
    // http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh994930.aspx

	os = new OSUWP;

}

// Called when the CoreWindow object is created (or re-created).
void App::SetWindow(CoreWindow^ p_window)
{
	window = p_window;
    window->VisibilityChanged +=
        ref new TypedEventHandler<CoreWindow^, VisibilityChangedEventArgs^>(this, &App::OnVisibilityChanged);

    window->Closed +=
        ref new TypedEventHandler<CoreWindow^, CoreWindowEventArgs^>(this, &App::OnWindowClosed);

    window->SizeChanged +=
        ref new TypedEventHandler<CoreWindow^, WindowSizeChangedEventArgs^>(this, &App::OnWindowSizeChanged);

#if !(WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
    // Disable all pointer visual feedback for better performance when touching.
    // This is not supported on Windows Phone applications.
    auto pointerVisualizationSettings = PointerVisualizationSettings::GetForCurrentView();
    pointerVisualizationSettings->IsContactFeedbackEnabled = false;
    pointerVisualizationSettings->IsBarrelButtonFeedbackEnabled = false;
#endif


	window->PointerPressed +=
		ref new TypedEventHandler<CoreWindow^, PointerEventArgs^>(this, &App::OnPointerPressed);
	window->PointerMoved +=
		ref new TypedEventHandler<CoreWindow^, PointerEventArgs^>(this, &App::OnPointerMoved);
	window->PointerReleased +=
		ref new TypedEventHandler<CoreWindow^, PointerEventArgs^>(this, &App::OnPointerReleased);
	window->PointerWheelChanged +=
		ref new TypedEventHandler<CoreWindow^, PointerEventArgs^>(this, &App::OnPointerWheelChanged);

	mouseChangedNotifier = SignalNotifier::AttachToEvent(L"os_mouse_mode_changed", ref new SignalHandler(
		this, &App::OnMouseModeChanged
	));

	mouseChangedNotifier->Enable();

	window->CharacterReceived +=
		ref new TypedEventHandler<CoreWindow^, CharacterReceivedEventArgs^>(this, &App::OnCharacterReceived);
	window->KeyDown +=
		ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(this, &App::OnKeyDown);
	window->KeyUp +=
		ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(this, &App::OnKeyUp);


	unsigned int argc;
	char** argv = get_command_line(&argc);

	Main::setup("uwp", argc, argv, false);

	// The CoreWindow has been created, so EGL can be initialized.
	ContextEGL* context = memnew(ContextEGL(window));
	os->set_gl_context(context);
	UpdateWindowSize(Size(window->Bounds.Width, window->Bounds.Height));

	Main::setup2();
}

static int _get_button(Windows::UI::Input::PointerPoint ^pt) {

	using namespace Windows::UI::Input;

#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
	return BUTTON_LEFT;
#else
	switch (pt->Properties->PointerUpdateKind)
	{
		case PointerUpdateKind::LeftButtonPressed:
		case PointerUpdateKind::LeftButtonReleased:
			return BUTTON_LEFT;

		case PointerUpdateKind::RightButtonPressed:
		case PointerUpdateKind::RightButtonReleased:
			return BUTTON_RIGHT;

		case PointerUpdateKind::MiddleButtonPressed:
		case PointerUpdateKind::MiddleButtonReleased:
			return BUTTON_MIDDLE;

		case PointerUpdateKind::XButton1Pressed:
		case PointerUpdateKind::XButton1Released:
			return BUTTON_WHEEL_UP;

		case PointerUpdateKind::XButton2Pressed:
		case PointerUpdateKind::XButton2Released:
			return BUTTON_WHEEL_DOWN;

		default:
			break;
	}
#endif

	return 0;
};

static bool _is_touch(Windows::UI::Input::PointerPoint ^pointerPoint) {
#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
	return true;
#else
	using namespace Windows::Devices::Input;
	switch (pointerPoint->PointerDevice->PointerDeviceType) {
		case PointerDeviceType::Touch:
		case PointerDeviceType::Pen:
			return true;
		default:
			return false;
	}
#endif
}


static Windows::Foundation::Point _get_pixel_position(CoreWindow^ window, Windows::Foundation::Point rawPosition, OS* os) {

	Windows::Foundation::Point outputPosition;

	// Compute coordinates normalized from 0..1.
	// If the coordinates need to be sized to the SDL window,
	// we'll do that after.
	#if 1 || WINAPI_FAMILY != WINAPI_FAMILY_PHONE_APP
	outputPosition.X = rawPosition.X / window->Bounds.Width;
	outputPosition.Y = rawPosition.Y / window->Bounds.Height;
	#else
	switch (DisplayProperties::CurrentOrientation)
	{
		case DisplayOrientations::Portrait:
			outputPosition.X = rawPosition.X / window->Bounds.Width;
			outputPosition.Y = rawPosition.Y / window->Bounds.Height;
			break;
		case DisplayOrientations::PortraitFlipped:
			outputPosition.X = 1.0f - (rawPosition.X / window->Bounds.Width);
			outputPosition.Y = 1.0f - (rawPosition.Y / window->Bounds.Height);
			break;
		case DisplayOrientations::Landscape:
			outputPosition.X = rawPosition.Y / window->Bounds.Height;
			outputPosition.Y = 1.0f - (rawPosition.X / window->Bounds.Width);
			break;
		case DisplayOrientations::LandscapeFlipped:
			outputPosition.X = 1.0f - (rawPosition.Y / window->Bounds.Height);
			outputPosition.Y = rawPosition.X / window->Bounds.Width;
			break;
		default:
			break;
	}
	#endif

	OS::VideoMode vm = os->get_video_mode();
	outputPosition.X *= vm.width;
	outputPosition.Y *= vm.height;

	return outputPosition;
};

static int _get_finger(uint32_t p_touch_id) {

	return p_touch_id % 31; // for now
};

void App::pointer_event(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args, bool p_pressed, bool p_is_wheel) {

	Windows::UI::Input::PointerPoint ^point = args->CurrentPoint;
	Windows::Foundation::Point pos = _get_pixel_position(window, point->Position, os);
	int but = _get_button(point);
	if (_is_touch(point)) {

		InputEvent event;
		event.type = InputEvent::SCREEN_TOUCH;
		event.device = 0;
		event.screen_touch.pressed = p_pressed;
		event.screen_touch.x = pos.X;
		event.screen_touch.y = pos.Y;
		event.screen_touch.index = _get_finger(point->PointerId);

		last_touch_x[event.screen_touch.index] = pos.X;
		last_touch_y[event.screen_touch.index] = pos.Y;

		os->input_event(event);
		if (number_of_contacts > 1)
			return;

	}; // fallthrought of sorts

	InputEvent event;
	event.type = InputEvent::MOUSE_BUTTON;
	event.device = 0;
	event.mouse_button.pressed = p_pressed;
	event.mouse_button.button_index = but;
	event.mouse_button.x = pos.X;
	event.mouse_button.y = pos.Y;
	event.mouse_button.global_x = pos.X;
	event.mouse_button.global_y = pos.Y;

	if (p_is_wheel) {
		if (point->Properties->MouseWheelDelta > 0) {
			event.mouse_button.button_index = point->Properties->IsHorizontalMouseWheel ? BUTTON_WHEEL_RIGHT : BUTTON_WHEEL_UP;
		} else if (point->Properties->MouseWheelDelta < 0) {
			event.mouse_button.button_index = point->Properties->IsHorizontalMouseWheel ? BUTTON_WHEEL_LEFT : BUTTON_WHEEL_DOWN;
		}
	}

	last_touch_x[31] = pos.X;
	last_touch_y[31] = pos.Y;

	os->input_event(event);
};


void App::OnPointerPressed(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args) {

	number_of_contacts++;
	pointer_event(sender, args, true);
};


void App::OnPointerReleased(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args) {

	number_of_contacts--;
	pointer_event(sender, args, false);
};

void App::OnPointerWheelChanged(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args) {

	pointer_event(sender, args, true, true);
}

void App::OnMouseModeChanged(Windows::System::Threading::Core::SignalNotifier^ signalNotifier, bool timedOut) {

	OS::MouseMode mode = os->get_mouse_mode();
	SignalNotifier^ notifier = mouseChangedNotifier;

	window->Dispatcher->RunAsync(
		CoreDispatcherPriority::High,
		ref new DispatchedHandler(
		[mode, notifier, this]() {
			if (mode == OS::MOUSE_MODE_CAPTURED) {

				this->MouseMovedToken = MouseDevice::GetForCurrentView()->MouseMoved +=
					ref new TypedEventHandler<MouseDevice^, MouseEventArgs^>(this, &App::OnMouseMoved);

			} else {

				MouseDevice::GetForCurrentView()->MouseMoved -= MouseMovedToken;

			}

			notifier->Enable();
	}));

	ResetEvent(os->mouse_mode_changed);


}

void App::OnPointerMoved(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args) {

	Windows::UI::Input::PointerPoint ^point = args->CurrentPoint;
	Windows::Foundation::Point pos = _get_pixel_position(window, point->Position, os);

	if (point->IsInContact && _is_touch(point)) {

		InputEvent event;
		event.type = InputEvent::SCREEN_DRAG;
		event.device = 0;
		event.screen_drag.x = pos.X;
		event.screen_drag.y = pos.Y;
		event.screen_drag.index = _get_finger(point->PointerId);
		event.screen_drag.relative_x = event.screen_drag.x - last_touch_x[event.screen_drag.index];
		event.screen_drag.relative_y = event.screen_drag.y - last_touch_y[event.screen_drag.index];

		os->input_event(event);
		if (number_of_contacts > 1)
			return;

	}; // fallthrought of sorts

	// In case the mouse grabbed, MouseMoved will handle this
	if (os->get_mouse_mode() == OS::MouseMode::MOUSE_MODE_CAPTURED)
		return;

	InputEvent event;
	event.type = InputEvent::MOUSE_MOTION;
	event.device = 0;
	event.mouse_motion.x = pos.X;
	event.mouse_motion.y = pos.Y;
	event.mouse_motion.global_x = pos.X;
	event.mouse_motion.global_y = pos.Y;
	event.mouse_motion.relative_x = pos.X - last_touch_x[31];
	event.mouse_motion.relative_y = pos.Y - last_touch_y[31];

	last_mouse_pos = pos;

	os->input_event(event);

}

void App::OnMouseMoved(MouseDevice ^ mouse_device, MouseEventArgs ^ args) {

	// In case the mouse isn't grabbed, PointerMoved will handle this
	if (os->get_mouse_mode() != OS::MouseMode::MOUSE_MODE_CAPTURED)
		return;

	Windows::Foundation::Point pos;
	pos.X = last_mouse_pos.X + args->MouseDelta.X;
	pos.Y = last_mouse_pos.Y + args->MouseDelta.Y;

	InputEvent event;
	event.type = InputEvent::MOUSE_MOTION;
	event.device = 0;
	event.mouse_motion.x = pos.X;
	event.mouse_motion.y = pos.Y;
	event.mouse_motion.global_x = pos.X;
	event.mouse_motion.global_y = pos.Y;
	event.mouse_motion.relative_x = args->MouseDelta.X;
	event.mouse_motion.relative_y = args->MouseDelta.Y;

	last_mouse_pos = pos;

	os->input_event(event);
}

void App::key_event(Windows::UI::Core::CoreWindow^ sender, bool p_pressed, Windows::UI::Core::KeyEventArgs^ key_args, Windows::UI::Core::CharacterReceivedEventArgs^ char_args)
{

	OSUWP::KeyEvent ke;

	InputModifierState mod;
	mod.meta = false;
	mod.command = false;
	mod.control = sender->GetAsyncKeyState(VirtualKey::Control) == CoreVirtualKeyStates::Down;
	mod.alt = sender->GetAsyncKeyState(VirtualKey::Menu) == CoreVirtualKeyStates::Down;
	mod.shift = sender->GetAsyncKeyState(VirtualKey::Shift) == CoreVirtualKeyStates::Down;
	ke.mod_state = mod;

	ke.pressed = p_pressed;
	
	if (key_args != nullptr) {
		
		ke.type = OSUWP::KeyEvent::MessageType::KEY_EVENT_MESSAGE;
		ke.unicode = 0;
		ke.scancode = KeyMappingWindows::get_keysym((unsigned int)key_args->VirtualKey);
		ke.echo = (!p_pressed && !key_args->KeyStatus.IsKeyReleased) || (p_pressed && key_args->KeyStatus.WasKeyDown);

	} else {

		ke.type = OSUWP::KeyEvent::MessageType::CHAR_EVENT_MESSAGE;
		ke.unicode = char_args->KeyCode;
		ke.scancode = 0;
		ke.echo = (!p_pressed && !char_args->KeyStatus.IsKeyReleased) || (p_pressed && char_args->KeyStatus.WasKeyDown);
	}

	os->queue_key_event(ke);

}
void App::OnKeyDown(CoreWindow^ sender, KeyEventArgs^ args)
{
	key_event(sender, true, args);
}

void App::OnKeyUp(CoreWindow^ sender, KeyEventArgs^ args)
{
	key_event(sender, false, args);
}

void App::OnCharacterReceived(CoreWindow^ sender, CharacterReceivedEventArgs^ args)
{
	key_event(sender, true, nullptr, args);
}


// Initializes scene resources
void App::Load(Platform::String^ entryPoint)
{

}

// This method is called after the window becomes active.
void App::Run()
{
	if (Main::start())
		os->run();
}

// Terminate events do not cause Uninitialize to be called. It will be called if your IFrameworkView
// class is torn down while the app is in the foreground.
void App::Uninitialize()
{
	Main::cleanup();
	delete os;
}

// Application lifecycle event handler.
void App::OnActivated(CoreApplicationView^ applicationView, IActivatedEventArgs^ args)
{
    // Run() won't start until the CoreWindow is activated.
    CoreWindow::GetForCurrentThread()->Activate();
}

// Window event handlers.
void App::OnVisibilityChanged(CoreWindow^ sender, VisibilityChangedEventArgs^ args)
{
    mWindowVisible = args->Visible;
}

void App::OnWindowClosed(CoreWindow^ sender, CoreWindowEventArgs^ args)
{
    mWindowClosed = true;
}

void App::OnWindowSizeChanged(CoreWindow^ sender, WindowSizeChangedEventArgs^ args)
{
#if (WINAPI_FAMILY == WINAPI_FAMILY_PC_APP)
    // On Windows 8.1, apps are resized when they are snapped alongside other apps, or when the device is rotated.
    // The default framebuffer will be automatically resized when either of these occur.
    // In particular, on a 90 degree rotation, the default framebuffer's width and height will switch.
    UpdateWindowSize(args->Size);
#else if (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
    // On Windows Phone 8.1, the window size changes when the device is rotated.
    // The default framebuffer will not be automatically resized when this occurs.
    // It is therefore up to the app to handle rotation-specific logic in its rendering code.
	//os->screen_size_changed();
	UpdateWindowSize(args->Size);
#endif
}

void App::UpdateWindowSize(Size size)
{
	float dpi;
#if (WINAPI_FAMILY == WINAPI_FAMILY_PC_APP)
	DisplayInformation^ currentDisplayInformation = DisplayInformation::GetForCurrentView();
	dpi = currentDisplayInformation->LogicalDpi;
#else if (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
	dpi = DisplayProperties::LogicalDpi;
#endif
	Size pixelSize(ConvertDipsToPixels(size.Width, dpi), ConvertDipsToPixels(size.Height, dpi));

    mWindowWidth = static_cast<GLsizei>(pixelSize.Width);
    mWindowHeight = static_cast<GLsizei>(pixelSize.Height);

	OS::VideoMode vm;
	vm.width = mWindowWidth;
	vm.height = mWindowHeight;
	vm.fullscreen = true;
	vm.resizable = false;
	os->set_video_mode(vm);
}

char** App::get_command_line(unsigned int* out_argc) {

	static char* fail_cl[] = { "-path", "game", NULL };
	*out_argc = 2;

	FILE* f = _wfopen(L"__cl__.cl", L"rb");

	if (f == NULL) {

		wprintf(L"Couldn't open command line file.");
		return fail_cl;
	}

#define READ_LE_4(v) ((int)(##v[3] & 0xFF) << 24) | ((int)(##v[2] & 0xFF) << 16) | ((int)(##v[1] & 0xFF) << 8) | ((int)(##v[0] & 0xFF))
#define CMD_MAX_LEN 65535

	uint8_t len[4];
	int r = fread(len, sizeof(uint8_t), 4, f);

	Platform::Collections::Vector<Platform::String^> cl;

	if (r < 4) {
		fclose(f);
		wprintf(L"Wrong cmdline length.");
		return(fail_cl);
	}

	int argc = READ_LE_4(len);

	for (int i = 0; i < argc; i++) {

		r = fread(len, sizeof(uint8_t), 4, f);

		if (r < 4) {
			fclose(f);
			wprintf(L"Wrong cmdline param length.");
			return(fail_cl);
		}

		int strlen = READ_LE_4(len);

		if (strlen > CMD_MAX_LEN) {
			fclose(f);
			wprintf(L"Wrong command length.");
			return(fail_cl);
		}

		char* arg = new char[strlen + 1];
		r = fread(arg, sizeof(char), strlen, f);
		arg[strlen] = '\0';

		if (r == strlen) {

			int warg_size = MultiByteToWideChar(CP_UTF8, 0, arg, -1, NULL, 0);
			wchar_t* warg = new wchar_t[warg_size];

			MultiByteToWideChar(CP_UTF8, 0, arg, -1, warg, warg_size);

			cl.Append(ref new Platform::String(warg, warg_size));

		} else {

			delete[] arg;
			fclose(f);
			wprintf(L"Error reading command.");
			return(fail_cl);
		}
	}

#undef READ_LE_4
#undef CMD_MAX_LEN

	fclose(f);

	char** ret = new char*[cl.Size + 1];

	for (int i = 0; i < cl.Size; i++) {

		int arg_size = WideCharToMultiByte(CP_UTF8, 0, cl.GetAt(i)->Data(), -1, NULL, 0, NULL, NULL);
		char* arg = new char[arg_size];

		WideCharToMultiByte(CP_UTF8, 0, cl.GetAt(i)->Data(), -1, arg, arg_size, NULL, NULL);

		ret[i] = arg;

	}
	ret[cl.Size] = NULL;
	*out_argc = cl.Size;

	return ret;
}
