import std;
import Crafter.Build;
namespace fs = std::filesystem;
using namespace Crafter;

// SponzaBench — a headless benchmark harness around the native Sponza
// ray-tracing scene. Same asset bundle and shaders as examples/Sponza,
// but main.cpp times setup + a fixed measured frame loop instead of
// opening an interactive window. Native (Vulkan) only — the point is to
// measure the native renderer's per-frame and setup cost across library
// revisions (issue #155: net perf gain from #40 to now).
constexpr std::string_view kSponzaGitUrl    = "https://github.com/jimmiebergmann/Sponza.git";
constexpr std::string_view kSponzaCommitSHA = "222338979d32f4f4818466291bdbc29f192b86ba";
constexpr std::uint16_t    kAlbedoSize      = 1024u;

extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
    std::vector<std::string> graphicsArgs(args.begin(), args.end());
    Configuration* graphics = LocalProject({
        .projectFile = "../../project.cpp",
        .args = graphicsArgs,
    });

    Configuration cfg;
    cfg.path = "./";
    cfg.name = "SponzaBench";
    cfg.outputName = "SponzaBench";
    cfg.type = ConfigurationType::Executable;
    ApplyStandardArgs(cfg, args);
    cfg.dependencies = { graphics };

    std::array<fs::path, 0> ifaces = {};
    std::array<fs::path, 1> impls = { "main" };
    cfg.GetInterfacesAndImplementations(ifaces, impls);

    fs::path sponzaRoot = GitFetch({
        .url    = std::string(kSponzaGitUrl),
        .commit = std::string(kSponzaCommitSHA),
    });
    std::string bundleKey = std::format("{}|{}", kSponzaCommitSHA, kAlbedoSize);
    auto bundleHash = std::hash<std::string>{}(bundleKey);
    fs::path bundleDir = fs::path("build") / std::format("sponza-bundle-{:016x}", bundleHash);

    if (auto err = BuildOBJBundle(
            sponzaRoot / "sponza.obj",
            sponzaRoot / "sponza.mtl",
            bundleDir,
            kAlbedoSize); !err.empty()) {
        std::println(std::cerr, "Sponza bundle error: {}", err);
        std::exit(1);
    }

    for (const auto& entry : fs::directory_iterator(bundleDir)) {
        if (entry.is_regular_file()) cfg.files.push_back(entry.path());
    }

    cfg.shaders.emplace_back(fs::path("raygen.glsl"),     std::string("main"), ShaderType::RayGen);
    cfg.shaders.emplace_back(fs::path("closesthit.glsl"), std::string("main"), ShaderType::ClosestHit);
    cfg.shaders.emplace_back(fs::path("miss.glsl"),       std::string("main"), ShaderType::Miss);
    return cfg;
}