// Framework includes
#include "BsApplication.h"
#include "Resources/BsResources.h"
#include "Audio/BsAudioClip.h"
#include "Audio/BsAudioClipImportOptions.h"
#include "Audio/BsAudio.h"
#include "Material/BsMaterial.h"
#include "Components/BsCCamera.h"
#include "Components/BsCAudioSource.h"
#include "Components/BsCAudioListener.h"
#include "RenderAPI/BsRenderAPI.h"
#include "RenderAPI/BsRenderWindow.h"
#include "Scene/BsSceneObject.h"
#include "Importer/BsImporter.h"
#include "Utility/BsTime.h"
#include "Input/BsInput.h"
#include "GUI/BsCGUIWidget.h"
#include "GUI/BsGUIPanel.h"
#include "GUI/BsGUILayoutY.h"
#include "GUI/BsGUILabel.h"

// Example headers
#include "BsExampleConfig.h"

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// This example demonstrates how to import audio clips and then play them back using a variety of settings.
//
// The example starts off by import the relevant audio clips, demonstrating various settings for streaming, compression and
// 2D/3D audio. It then sets up a camera that will be used for GUI rendering, unrelated to audio. It proceeds to
// add an AudioListener component which is required to play back 3D sounds (it determines what are sounds relative to). It
// then creates a couple of AudioSources - one that is static and used for music playback (2D audio), and another that
// moves around the listener and demonstrates 3D audio playback. Follow that, input is hooked up that lets the user switch
// between the playback of the two audio sources. It also demonstrates how to play one-shot audio clips without the
// AudioSource component. Finally, GUI is set up that lets the user know which input controls are available.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
namespace bs
{
	UINT32 windowResWidth = 1280;
	UINT32 windowResHeight = 720;

	/** Create a helper component that causes its scene object to move around in a circle around the world origin. */
	class ObjectFlyer : public Component
	{
	public:
		ObjectFlyer(const HSceneObject& parent)
			:Component(parent)
		{ }

		/** Triggered once per frame. */
		void update() override
		{
			const float time = gTime().getTime();

			const float x = cos(time);
			const float z = sin(time);
			
			SO()->setPosition(Vector3(x, 0.0f, z));
		}
	};

	/** Import audio clips and set up the audio sources and listeners. */
	void setUpScene()
	{
		/************************************************************************/
		/* 									ASSETS	                     		*/
		/************************************************************************/

		// First import any audio clips we plan on using

		// Set up paths to the audio file resources
		const Path exampleDataPath = EXAMPLE_DATA_PATH;
		const Path musicClipPath = exampleDataPath + "Audio/BrokeForFree-NightOwl.ogg";
		const Path environmentClipPath = exampleDataPath + "Audio/FilteredPianoAmbient.ogg";
		const Path cueClipPath = exampleDataPath + "Audio/GunShot.wav";

		// Import the music audio clip. Compress the imported data to Vorbis format to save space, at the cost of decoding
		// performance. Also since it's a longer audio clip, use streaming to avoid loading the entire clip into memory,
		// at the additional cost of performance and IO overhead.
		SPtr<AudioClipImportOptions> musicImportOptions = AudioClipImportOptions::create();
		musicImportOptions->setFormat(AudioFormat::VORBIS);
		musicImportOptions->setReadMode(AudioReadMode::Stream);
		musicImportOptions->setIs3D(false);

		HAudioClip musicClip = gImporter().import<AudioClip>(musicClipPath, musicImportOptions);

		// Import a loopable environment ambient sound. Compress the imported data to Vorbis format to save space, at the
		// cost of decoding performance. Same as the music clip, this is also a longer clip, but instead of streaming we
		// load the compressed data and just uncompress on the fly. This saves on IO overhead at the cost of little
		// extra memory.
		SPtr<AudioClipImportOptions> environmentImportOptions = AudioClipImportOptions::create();
		environmentImportOptions->setFormat(AudioFormat::VORBIS);
		environmentImportOptions->setReadMode(AudioReadMode::LoadCompressed);
		environmentImportOptions->setIs3D(true);

		HAudioClip environmentClip = gImporter().import<AudioClip>(environmentClipPath, environmentImportOptions);

		// Import a short audio cue. Use the uncompressed PCM audio format for fast playback, at the cost of memory.
		SPtr<AudioClipImportOptions> cueImportOptions = AudioClipImportOptions::create();
		cueImportOptions->setFormat(AudioFormat::PCM);
		cueImportOptions->setIs3D(true);

		HAudioClip cueClip = gImporter().import<AudioClip>(cueClipPath, cueImportOptions);

		/************************************************************************/
		/* 									CAMERA	                     		*/
		/************************************************************************/

		// Add a camera that will be used for rendering out GUI elements

		// Like before, we create a new scene object at (0, 0, 0).
		HSceneObject sceneCameraSO = SceneObject::create("SceneCamera");

		// Get the primary render window we need for creating the camera. 
		SPtr<RenderWindow> window = gApplication().getPrimaryWindow();

		// Add a Camera component that will output whatever it sees into that window 
		// (You could also use a render texture or another window you created).
		HCamera sceneCamera = sceneCameraSO->addComponent<CCamera>();
		sceneCamera->getViewport()->setTarget(window);

		// Set background color
		sceneCamera->getViewport()->setClearColorValue(Color::Black);

		/************************************************************************/
		/* 									AUDIO	                     		*/
		/************************************************************************/

		// Set up an audio listener. Every sound will be played relative to this listener. We'll add it to the same
		// scene object as our main camera.
		HAudioListener listener = sceneCameraSO->addComponent<CAudioListener>();

		// Add an audio source for playing back the music. Position of the audio source is not important as it is not
		// a 3D sound. 
		HSceneObject musicSourceSO = SceneObject::create("Music");
		HAudioSource musicSource = musicSourceSO->addComponent<CAudioSource>();

		// Assign the clip we want to use for the audio source
		musicSource->setClip(musicClip);

		// Start playing the audio clip immediately
		musicSource->play();

		// Add an audio source for playing back an environment sound. This sound is played back on a scene object that
		// orbits the viewer.
		HSceneObject environmentSourceSO = SceneObject::create("Environment");
		HAudioSource environmentSource = environmentSourceSO->addComponent<CAudioSource>();

		// Assign the clip we want to use for the audio source
		environmentSource->setClip(environmentClip);

		// Make sure the sound keeps looping if it reaches the end
		environmentSource->setIsLooping(true);

		// Make the audio source orbit the listener, by attaching an ObjectFlyer component
		environmentSourceSO->addComponent<ObjectFlyer>();

		/************************************************************************/
		/* 									INPUT	                     		*/
		/************************************************************************/

		// Hook up input commands that toggle between the different audio sources.
		gInput().onButtonUp.connect([=](const ButtonEvent& event)
		{
			switch(event.buttonCode)
			{
			case BC_1:
				// Start or resume playing music, if not already playing. Stop the ambient sound playback.
				environmentSource->stop();
				musicSource->play();
				break;
			case BC_2:
				// Start playing ambient sound, if not already playing. Pause music playback.
				musicSource->pause();
				environmentSource->play();
				break;
			case BC_MOUSE_LEFT:
				// Play a one-shot sound at origin. We don't use an AudioSource component because it's a short sound cue
				// that we don't require additional control over.
				gAudio().play(cueClip, Vector3::ZERO);
				break;
			default:
				break;
			}
		});

		/************************************************************************/
		/* 									GUI		                     		*/
		/************************************************************************/

		// Display GUI elements indicating to the user which input keys are available

		// Add a GUIWidget component we will use for rendering the GUI
		HSceneObject guiSO = SceneObject::create("GUI");
		HGUIWidget gui = guiSO->addComponent<CGUIWidget>(sceneCamera);

		// Grab the main panel onto which to attach the GUI elements to
		GUIPanel* mainPanel = gui->getPanel();

		// Create a vertical GUI layout to align the labels one below each other
		GUILayoutY* vertLayout = GUILayoutY::create();

		// Create the GUI labels displaying the available input commands
		HString musicString(u8"Press 1 to play music");
		HString environmentString(u8"Press 2 to play 3D ambient sound");
		HString cueString(u8"Press left mouse button to play a gun shot sound");

		vertLayout->addNewElement<GUILabel>(musicString);
		vertLayout->addNewElement<GUILabel>(environmentString);
		vertLayout->addNewElement<GUILabel>(cueString);

		// Register the layout with the main GUI panel, placing the layout in top left corner of the screen by default
		mainPanel->addElement(vertLayout);
	}
}

/** Main entry point into the application. */
#if BS_PLATFORM == BS_PLATFORM_WIN32
#include <windows.h>

int CALLBACK WinMain(
	_In_  HINSTANCE hInstance,
	_In_  HINSTANCE hPrevInstance,
	_In_  LPSTR lpCmdLine,
	_In_  int nCmdShow
	)
#else
int main()
#endif
{
	using namespace bs;

	// Initializes the application and creates a window with the specified properties
	VideoMode videoMode(windowResWidth, windowResHeight);
	Application::startUp(videoMode, "Example", false);

	// Custom example code goes here
	setUpScene();

	// Runs the main loop that does most of the work. This method will exit when user closes the main
	// window or exits in some other way.
	Application::instance().runMainLoop();

	// When done, clean up
	Application::shutDown();

	return 0;
}