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

extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
    bool debug = false;
    std::string target = "x86_64-pc-linux-gnu";
    for (std::string_view arg : args) {
        if (arg == "--debug") debug = true;
        else if (arg.starts_with("--target=")) target = std::string(arg.substr(std::string_view("--target=").size()));
    }

    // Honor CRAFTER_BUILD_MARCH/MTUNE so CI (which sets these for portability)
    // applies them to both the self-rebuild and the mingw cross-compile —
    // otherwise Configuration's "native" defaults bake in the build host's
    // CPU and the published artifact's portability becomes accidental.
    const char* envMarch = std::getenv("CRAFTER_BUILD_MARCH");
    const char* envMtune = std::getenv("CRAFTER_BUILD_MTUNE");
    std::string march = (envMarch && *envMarch) ? envMarch : "native";
    std::string mtune = (envMtune && *envMtune) ? envMtune : "native";

    static auto crafterBuildLib = std::make_unique<Configuration>();
    crafterBuildLib->path = "./";
    crafterBuildLib->name = "crafter.build-lib";
    crafterBuildLib->outputName = "crafter-build";
    crafterBuildLib->target = target;
    crafterBuildLib->march = march;
    crafterBuildLib->mtune = mtune;
    // Windows builds (native msvc via build.cmd or cross-compiled mingw from
    // Linux) need a DLL + import lib + launcher exe so LoadProject can
    // compile project.cpp against a stable ABI boundary. Linux is monolithic.
    crafterBuildLib->type = (target == "x86_64-w64-mingw32" || target == "x86_64-pc-windows-msvc")
        ? ConfigurationType::LibraryDynamic
        : ConfigurationType::LibraryStatic;
    crafterBuildLib->debug = debug;
    {
        std::array<fs::path, 8> interfaces = {
            "interfaces/Crafter.Build",
            "interfaces/Crafter.Build-Shader",
            "interfaces/Crafter.Build-Platform",
            "interfaces/Crafter.Build-Interface",
            "interfaces/Crafter.Build-Implementation",
            "interfaces/Crafter.Build-External",
            "interfaces/Crafter.Build-Clang",
            "interfaces/Crafter.Build-Test",
        };
        std::array<fs::path, 7> implementations = {
            "implementations/Crafter.Build-Shader",
            "implementations/Crafter.Build-Platform",
            "implementations/Crafter.Build-Interface",
            "implementations/Crafter.Build-Implementation",
            "implementations/Crafter.Build-External",
            "implementations/Crafter.Build-Clang",
            "implementations/Crafter.Build-Test",
        };
        crafterBuildLib->GetInterfacesAndImplementations(interfaces, implementations);
    }
    ExternalDependency& glslang = crafterBuildLib->externalDependencies.emplace_back();
    glslang.name = "glslang";
    glslang.source.url = "https://github.com/KhronosGroup/glslang.git";
    glslang.source.branch = "main";
    glslang.builder = ExternalBuilder::CMake;
    glslang.options = { "-DENABLE_OPT=OFF" };
    // mingw cross-build: skip the standalone executable. We only consume the
    // libraries, and glslang.exe pulls in libgcc_eh which needs pthread that
    // mingw-w64 doesn't link by default.
    if (target == "x86_64-w64-mingw32") {
        glslang.options.push_back("-DENABLE_GLSLANG_BINARIES=OFF");
    }
    glslang.includeDirs = { "" };
    glslang.libs = { "SPIRV", "GenericCodeGen", "glslang", "OSDependent", "MachineIndependent", "glslang-default-resource-limits" };

    Configuration cfg;
    cfg.path = "./";
    cfg.name = "crafter.build-exe";
    cfg.outputName = "crafter-build";
    cfg.target = target;
    cfg.march = march;
    cfg.mtune = mtune;
    cfg.type = ConfigurationType::Executable;
    cfg.debug = debug;
    cfg.dependencies = { crafterBuildLib.get() };
    {
        std::array<fs::path, 0> interfaces = {};
        std::array<fs::path, 1> implementations = { "implementations/main" };
        cfg.GetInterfacesAndImplementations(interfaces, implementations);
    }
    if (target == "x86_64-pc-linux-gnu") {
        cfg.linkFlags.push_back("-Wl,--export-dynamic");
        cfg.linkFlags.push_back("-ldl");
    }

    return cfg;
}