#include <iostream>
#include <fstream>
#include <catch2/catch.hpp>

#include "libslic3r/TriangleMesh.hpp"

TEST_CASE("Split empty mesh", "[its_split][its]") {
    using namespace Slic3r;

    indexed_triangle_set its;

    std::vector<indexed_triangle_set> res = its_split(its);

    REQUIRE(res.empty());
}

TEST_CASE("Split simple mesh consisting of one part", "[its_split][its]") {
    using namespace Slic3r;

    TriangleMesh cube = make_cube(10., 10., 10.);

    std::vector<indexed_triangle_set> res = its_split(cube.its);

    REQUIRE(res.size() == 1);
    REQUIRE(res.front().indices.size() == cube.its.indices.size());
    REQUIRE(res.front().vertices.size() == cube.its.vertices.size());
}

TEST_CASE("Split two merged spheres", "[its_split][its]") {
    using namespace Slic3r;

    TriangleMesh sphere1 = make_sphere(10., 2 * PI / 200.), sphere2 = sphere1;

    sphere1.translate(-5.f, 0.f, 0.f);
    sphere2.translate( 5.f, 0.f, 0.f);

    sphere1.merge(sphere2);
    sphere1.require_shared_vertices();

    std::vector<indexed_triangle_set> parts = its_split(sphere1.its);

    REQUIRE(parts.size() == 2);

#ifndef NDEBUG
    size_t part_idx = 0;
    for (auto &part_its : parts) {
        its_write_obj(part_its, (std::string("part_its") + std::to_string(part_idx++) + ".obj").c_str());
    }
#endif
}