#include <catch2/catch_all.hpp>

#include "libslic3r/Utils.hpp"

#ifndef _WIN32
#include <unistd.h>     // getuid
#endif

using namespace Slic3r;

TEST_CASE("per_user_temp_dir composes a per-user temp root", "[utils]") {
    const std::string base = "/tmp";

    SECTION("an empty id returns base unchanged") {
        REQUIRE(per_user_temp_dir(base, "") == base);
    }
    SECTION("a non-empty id is appended at the top level") {
        REQUIRE(per_user_temp_dir(base, "1000") == base + "/orcaslicer_1000");
    }
    SECTION("distinct ids produce distinct roots") {
        REQUIRE(per_user_temp_dir(base, "1000") != per_user_temp_dir(base, "1001"));
    }
}

TEST_CASE("per_user_temp_id follows the platform contract", "[utils]") {
    const std::string id = per_user_temp_id();

    SECTION("stable across calls") {
        REQUIRE(per_user_temp_id() == id);
    }
#ifdef _WIN32
    SECTION("empty on Windows (its temp dir is already per-user)") {
        REQUIRE(id.empty());
    }
#else
    SECTION("the current uid on Linux/macOS") {
        REQUIRE_FALSE(id.empty());
        REQUIRE(id == std::to_string(static_cast<unsigned long>(::getuid())));
    }
#endif
}

// The end-to-end contract callers depend on: the temp root is left alone on
// Windows and isolated per user on Linux/macOS.
TEST_CASE("per-user temp root is unchanged on Windows, isolated elsewhere", "[utils]") {
    const std::string base = "/tmp";
    const std::string root = per_user_temp_dir(base, per_user_temp_id());
#ifdef _WIN32
    REQUIRE(root == base);
#else
    REQUIRE(root != base);
    REQUIRE_THAT(root, Catch::Matchers::StartsWith(base + "/orcaslicer_"));
#endif
}