// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#pragma once

#include <filesystem>
#include <optional>
#include <string>

// Helpers for the large reference datasets used by the [large] Catch tests. The datasets live
// under <repo>/tests/data and are tracked with git-LFS, so they are often NOT present (LFS not
// pulled, e.g. in CI). Tests run from <build>/tests, so the directory is reached via ../../.
namespace jfjoch_test {
    inline std::string LargeDataDir() { return "../../tests/data"; }

    // Path to a large dataset file if it is present and looks like real data rather than an
    // unfetched git-LFS pointer (those are tiny text stubs); std::nullopt otherwise. Tests should
    // SKIP() when this returns nullopt.
    inline std::optional<std::string> LargeDataFile(const std::string &name) {
        const std::string path = LargeDataDir() + "/" + name;
        std::error_code ec;
        if (!std::filesystem::is_regular_file(path, ec))
            return std::nullopt;
        if (ec || std::filesystem::file_size(path, ec) < 4096 || ec)
            return std::nullopt;   // an LFS pointer file is well under 4 kB; an HDF5 master is not
        return path;
    }
}