#include "Scene.hpp"

extern "C" {
#include "lauxlib.h"
#include "lualib.h"
}

#include "obj/OBJ_Loader.h"

#include <filesystem>

bool tp::Scene::loadOBJFormat(const std::string& objetsPath) {
	using namespace tp;

	objl::Loader Loader;

	if (!Loader.LoadFile(objetsPath)) {
		std::cout << "Failed to Load File. May have failed to find it or it was not an .obj file.\n";
		return false;
	}

	for (auto& curMesh : Loader.LoadedMeshes) {
		mObjects.append(Object());

		auto object = &mObjects.last();

		for (auto& vertex : curMesh.Vertices) {
			// printf("{ %f, %f, %f }, \n", vertex.Position.X, vertex.Position.Y, vertex.Position.Z);
			object->mTopology.Points.append(Vec3F{ vertex.Position.X, vertex.Position.Y, vertex.Position.Z });
			object->mTopology.Normals.append(Vec3F{ vertex.Normal.X, vertex.Normal.Y, vertex.Normal.Z });
		}

		for (int j = 0; j < curMesh.Indices.size(); j += 3) {
			auto idx1 = (uhalni) curMesh.Indices[j];
			auto idx2 = (uhalni) curMesh.Indices[j + 1];
			auto idx3 = (uhalni) curMesh.Indices[j + 2];
			// printf("{ %i, %i, %i },\n", idx1, idx2, idx3);
			object->mTopology.Indexes.append(Vec3<uhalni>{ idx1, idx2, idx3 });
		}

		if (object->mTopology.Normals.size() != object->mTopology.Points.size()) {
			printf("Logic error loading normals\n");
		}

		object->mCache.Source = &object->mTopology;
		object->mCache.updateCache();
	}

	return mObjects.size();
}

const tp::RayCastData& tp::Scene::castRay(const Ray& ray, alnf farVal) {
	auto& out = mRayCastData;

	out.hit = false;
	out.obj = nullptr;

	farVal *= farVal;

	for (auto obj : mObjects) {
		for (auto trig : obj->mCache.TrigCaches) {
			if (trig->castRay(ray)) {

				auto dist = (TrigCache::getHitPos() - ray.pos).length2();

				if (farVal > dist && dist > EPSILON) {
					out.trig = &trig.data();
					out.hitPos = TrigCache::getHitPos();
					out.obj = &obj.data();
					out.hit = true;

					farVal = dist;
				}
			}
		}
	}

	return mRayCastData;
}

void tp::Scene::updateCache() {
	for (auto obj : mObjects) {
		obj->mCache.updateCache();
	}
}