#include <LightEngine.h>

class MirrorLayer : public Light::Layer
{
private:
	std::shared_ptr<Light::Texture> m_AwesomefaceTexture;

	std::vector<glm::vec3> positions;
	std::vector<glm::vec2> sizes;

	glm::vec2 m_Direction;
	float m_Speed = 1.2f;

	std::shared_ptr<Light::Camera> m_Camera;

	std::shared_ptr<Light::Framebuffer> m_Framebuffer;

	bool m_GameSceneEvents = false;

public:
	MirrorLayer(const std::string& name)
		: Light::Layer(name), m_Direction(glm::vec2(0.0f, 0.0f))
	{
		m_Camera = std::make_shared<Light::Camera>(glm::vec2(0.0f), 800.0f / 600.0f, 1.0f);

		Light::ResourceManager::LoadTexture("awesomeface", "res/Textures/awesomeface.png");
		m_AwesomefaceTexture = Light::ResourceManager::GetTexture("awesomeface");
		
		m_Framebuffer = std::shared_ptr<Light::Framebuffer>(Light::Framebuffer::Create({ 800u, 600u, 1, glm::vec4(1.0f, 0.0f, 0.0f, 1.0f), false }, Light::GraphicsContext::GetSharedContext()));

		for (int i = 0; i < 100; i++)
		{
			glm::vec3 position = glm::vec3(-1.0f + (-100.0f / 400.0f) + ((rand() % 1000) / 400.0f), -1.0f + (-100.0f / 300.0f) + ((rand() % 800) / 300.0f), 0.0f);
			glm::vec2 size = glm::vec2(100 / 400.0f, 100 / 300.0f);

			positions.push_back(position);
			sizes.push_back(size);
		}
	}

	void OnRender() override
	{
		m_Camera->CalculateProjection();
		m_Camera->CalculateView();

		Light::Renderer::BeginScene(m_Camera, m_Framebuffer);

		for (int i = 0; i < 100; i++)
			Light::Renderer::DrawQuad(positions[i], sizes[i], m_AwesomefaceTexture);

		Light::Renderer::EndScene();
	}

	void OnUserInterfaceUpdate()
	{
		if (ImGui::Begin("GameView"))
		{
			Light::Input::ReceiveGameEvents(ImGui::IsWindowFocused());

			static ImVec2 regionAvailPrev = { 0, 0 };
			ImVec2 regionAvail = ImGui::GetContentRegionAvail();

			if (regionAvail.x != regionAvailPrev.x || regionAvail.y != regionAvailPrev.y)
			{
				m_Framebuffer->Resize({ regionAvail.x, regionAvail.y });
				m_Camera->OnResize({ regionAvail.x, regionAvail.y });
				regionAvailPrev = regionAvail;
			}

			if (Light::GraphicsContext::GetGraphicsAPI() == Light::GraphicsAPI::DirectX)
				ImGui::Image(m_Framebuffer->GetColorAttachment(), regionAvail);
			else
				ImGui::Image(m_Framebuffer->GetColorAttachment(), regionAvail, ImVec2(0, 1), ImVec2(1, 0));
		}

		ImGui::End();
	}

	void OnUpdate(float deltaTime) override
	{
		if (Light::Input::GetKeyboardKey(KEY_A))
			m_Direction.x = -1.0f;
		else if (Light::Input::GetKeyboardKey(KEY_D))
			m_Direction.x = 1.0f;
		else
			m_Direction.x = 0.0f;

		if (Light::Input::GetKeyboardKey(KEY_W))
			m_Direction.y = 1.0f;
		else if (Light::Input::GetKeyboardKey(KEY_S))
			m_Direction.y = -1.0f;
		else
			m_Direction.y = 0.0f;

		m_Camera->Move(m_Direction * m_Speed * deltaTime);
	}

};