#include <cassert>

#include <glm/gtc/matrix_transform.hpp>

#include "dumbLog.h"
#include "entity.h"
#include "util.h"


// forward declarations

void initDefaults(entity& e);


// interface

bool
entInitModel(entity& e, const char* model_path)
{
	initDefaults(e);

	if (meLoadFromFile(e.meshes, model_path))
	{
		e.render_objs = roInitModel(e.meshes);

		if (e.render_objs != nullptr)
			return true;
	}

	entFree(e);
	return false;
}

bool
entInitMesh(entity& e, simple_mesh* mesh, GLenum draw_mode)
{
	initDefaults(e);
	e.mesh = mesh;
	e.render_objs = roInitSimpleMesh(*e.mesh, draw_mode);

	if (e.render_objs == nullptr)
		return false;

	return true;
}

void
entFree(entity& e)
{
	roFree(e.render_objs);
	e.render_objs = nullptr;
	meFreeMeshGroup(e.meshes);
	meFreeSimpleMesh(e.mesh);
	e.mesh = nullptr;
}

void
entSetWorldPosition(entity& e, glm::vec3 v)
{
	e.world_transform[3][0] = v.x;
	e.world_transform[3][1] = v.y;
	e.world_transform[3][2] = v.z;
}

void
entTranslate(entity& e, glm::vec3 v)
{
	e.world_transform = glm::translate(e.world_transform, v);
}

void
entScale(entity& e, glm::vec3 v)
{
	e.world_transform = glm::scale(e.world_transform, v);
}

void
entRotate(entity& e, float angle, glm::vec3 axis)
{
	e.world_transform = glm::rotate(e.world_transform, angle, axis);
}


// internal

void
initDefaults(entity& e)
{
	e.world_transform = glm::mat4(1.0);
	entScale(e, glm::vec3(1.0));
	entSetWorldPosition(e, glm::vec3(0, 0, 0));
}