#include "SpriteRenderer.h"

Core::SpriteRenderer::SpriteRenderer()
{
    this->initRenderData();
}

Core::SpriteRenderer::~SpriteRenderer()
{
    glDeleteVertexArrays(1, &this ->VAO);
    glDeleteBuffers(1, &this->VBO);
    glDeleteBuffers(1, &this->EBO);
}
void Core::SpriteRenderer::DrawSprite(GLuint spriteTexture, const glm::mat4 modelMatrix, GLuint program) {

	Spaceship* spaceship = Spaceship::getInstance();

	// Pobierz pozycję kamery
	glm::vec3 cameraPosition = spaceship->cameraPos;

	// Twórz macierz lookAt między kwadratem a kamerą
	glm::mat4 billboardModelMatrix = glm::lookAt(glm::vec3(modelMatrix[3]), cameraPosition, glm::vec3(0.0f, 1.0f, 0.0f));

	// Reset the rotation part of the matrix to make it face the camera
	//billboardModelMatrix[0][0] = 1.0f;
	//billboardModelMatrix[0][1] = 0.0f;
	//billboardModelMatrix[0][2] = 0.0f;

	billboardModelMatrix[1][0] = 0.0f;
	billboardModelMatrix[1][1] = 1.0f;
	billboardModelMatrix[1][2] = 0.0f;

	billboardModelMatrix[2][0] = 0.0f;
	billboardModelMatrix[2][1] = 0.0f;
	billboardModelMatrix[2][2] = 1.0f;

	// Utwórz macierz widoku-projekcji
	glm::mat4 viewProjectionMatrix = Core::createPerspectiveMatrix() * spaceship->createCameraMatrix();

	// Kombinuj macierze transformacji
	glm::mat4 transformation = viewProjectionMatrix * billboardModelMatrix;

	// Przekaż macierze do shadera
	glUniformMatrix4fv(glGetUniformLocation(program, "transformation"), 1, GL_FALSE, glm::value_ptr(transformation));
	glUniformMatrix4fv(glGetUniformLocation(program, "modelMatrix"), 1, GL_FALSE, glm::value_ptr(billboardModelMatrix));
	Core::SetActiveTexture(spriteTexture, "colorTexture", program, 0);

	glBindVertexArray(this->VAO);
	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
	glBindVertexArray(0);
}

void Core::SpriteRenderer::initRenderData()
{
	// Definicja wierzchołków kwadratu
	float vertices[] = {
		// Postions						//colors		// texture coordiantes
		-0.5f, -0.5f, 0.0f,		1.0f, 0.0f, 0.0f,	0.0f, 0.0f, // Left down
		-0.5f, 0.5f, 0.0f,		0.0f, 1.0f, 0.0f,	0.0f,1.0f, // Left up
		 0.5f, 0.5f, 0.0f,		0.0f, 0.0f, 1.0f,	1.0f, 1.0f,// Right up
		 0.5f, -0.5f, 0.0f,		1.0f, 1.0f, 1.0f,   1.0f,0.0f// Right down
	};

	// Definicja indeksów wierzchołków dla kwadratu
	unsigned int indices[] = {
		0, 2, 1, // Upper triangle
		0, 3, 2  // Lower triangle
	};
	
	glGenVertexArrays(1, &this->VAO);
	glGenBuffers(1, &this->VBO);
	glGenBuffers(1, &this->EBO);

	glBindVertexArray(this->VAO);

	// Wypełnij bufor wierzchołków
	glBindBuffer(GL_ARRAY_BUFFER, this->VBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

	// Wypełnij bufor indeksów
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->EBO);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

	glEnableVertexAttribArray(0);
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);

	glEnableVertexAttribArray(1);
	// Konfiguracja atrybutu koordynatow kolorow
	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));

	glEnableVertexAttribArray(2);
	// Konfiguracja atrybutu koordynatow tekstury
	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));

	glBindVertexArray(0);
}