#include <sstream> // stringstream

#include "lights.h"


light_group*
lightsInit(uint max_lights)
{
	light_group* lg = UTIL_ALLOC(1, light_group);
	lg->lights = UTIL_ALLOC(max_lights, point_light);
	lg->max_lights = max_lights;
	return lg;
}

void
lightsOut(light_group* lights)
{
	utilSafeFree(lights->lights);
	utilSafeFree(lights);
}

bool
lightsAdd(light_group* lights, glm::vec3 pos, glm::vec3 color, float intensity)
{
	if (lights->num_lights == lights->max_lights)
		return false;

	point_light& pl = lights->lights[lights->num_lights];
	pl.position = pos;
	pl.color = color;
	pl.intensity = intensity;
	lights->needs_update = true;
	lights->num_lights++;

	return true;
}

void
lightsUpdate(light_group* lights, default_shader_program* shader)
{
	glUniform1ui(shader->num_lights_id, lights->num_lights);

	for (uint i = 0; i < lights->num_lights; i++) {
		std::stringstream ss;
		ss << "lights[" << i << "].position";
		int light_pos_loc =
			glGetUniformLocation(shader->program_id, ss.str().c_str());

		glUniform3fv(light_pos_loc, 1, &lights->lights[i].position[0]);
	}

	lights->needs_update = false;
}