package org.xfe.engine;

import org.joml.Matrix4f;
import org.joml.Vector3f;
import org.lwjgl.opengl.GL;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL15.*;
import static org.lwjgl.opengl.GL20.*;
import static org.lwjgl.opengl.GL30.*;

public class Render {

    private Matrix4f projection_matrix;
    public Render() {
        GL.createCapabilities();
    }

    public void cleanup() {
        // Nothing to be done here yet
    }

    public void render(Window window, World world) {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glfwSwapBuffers(window.getWindowHandle());

        float aspect_ratio = (float) window.getWidth() / window.getHeight();
        projection_matrix = new Matrix4f().perspective(Engine.FOV, aspect_ratio, Engine.Z_FAR, Engine.Z_NEAR);

        for (Entity entity : world.entities) {
            entity.shader.bind();

            entity.shader.setUniform("projection", projection_matrix);
//            entity.shader.setUniform("model", new Matrix4f().identity());
//            entity.shader.setUniform("view", new Matrix4f().identity());
//            entity.shader.setUniform("lightPos", world.lights.get(0).position);
//            entity.shader.setUniform("light_power", world.lights.get(0).power);
//            entity.shader.setUniform("lightColor", world.lights.get(0).color);
//            entity.shader.setUniform("objectColor", new Vector3f(1.0f, 1.0f, 1.0f));
//            entity.shader.setUniform("viewPos", new Vector3f(0.0f, 0.0f, 0.0f));


            glBindVertexArray(entity.mesh.ebo_id);
            glEnableVertexAttribArray(0);
//            glEnableVertexAttribArray(1);
            glDrawElements(GL_TRIANGLES, entity.mesh.vertice_indices.length, GL_UNSIGNED_INT, 0);
        }
    }
}