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

extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
    std::vector<std::string> depArgs(args.begin(), args.end());

    // Local-mode resolution for the Crafter.Math/Crafter.Asset deps that the
    // self-host pass links in (so `cfg.assets` calls CompressAsset → Crafter.Asset
    // in-process). `--local` points at sibling working trees instead of git;
    // useful during cross-repo development so edits in ../Crafter.Asset are
    // picked up without commit-and-pull.
    bool useLocal = false;
    for (std::string_view a : args) {
        if (a == "--local") { useLocal = true; break; }
    }
    auto resolveDep = [&](std::string_view name, std::string_view gitUrl) -> Configuration* {
        if (useLocal) {
            return LocalProject({
                .projectFile = fs::path("../") / name / "project.cpp",
                .args = depArgs,
            });
        }
        return GitProject({
            .source = { .url = std::string(gitUrl) },
            .args = depArgs,
        });
    };

    static auto crafterBuildLib = std::make_unique<Configuration>();
    crafterBuildLib->path = "./";
    crafterBuildLib->name = "crafter.build-lib";
    crafterBuildLib->outputName = "crafter-build";
    ApplyStandardArgs(*crafterBuildLib, args);
    // 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 = (crafterBuildLib->target == "x86_64-w64-mingw32" || crafterBuildLib->target == "x86_64-pc-windows-msvc")
        ? ConfigurationType::LibraryDynamic
        : ConfigurationType::LibraryStatic;
    // Self-host pass links Crafter.Asset (and its Crafter.Math dep) into the
    // crafter-build binary so cfg.assets can call CompressAsset in-process.
    // The bootstrap (build.sh) defines no such dep — its impl unit takes the
    // stub branch and cfg.assets errors at runtime until a self-host rebuild.
    Configuration* math  = resolveDep("Crafter.Math",  "https://forgejo.catcrafts.net/Catcrafts/Crafter.Math.git");
    Configuration* asset = resolveDep("Crafter.Asset", "https://forgejo.catcrafts.net/Catcrafts/Crafter.Asset.git");
    crafterBuildLib->dependencies = { math, asset };
    crafterBuildLib->defines.push_back({"CRAFTER_BUILD_HAS_ASSET", ""});
    {
        std::array<fs::path, 10> 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",
            "interfaces/Crafter.Build-Progress",
            "interfaces/Crafter.Build-Asset",
        };
        std::array<fs::path, 9> 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",
            "implementations/Crafter.Build-Progress",
            "implementations/Crafter.Build-Asset",
        };
        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 (crafterBuildLib->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";
    ApplyStandardArgs(cfg, args);
    cfg.type = ConfigurationType::Executable;
    cfg.dependencies = { crafterBuildLib.get() };
    {
        std::array<fs::path, 0> interfaces = {};
        std::array<fs::path, 1> implementations = { "implementations/main" };
        cfg.GetInterfacesAndImplementations(interfaces, implementations);
    }
    if (cfg.target == "x86_64-pc-linux-gnu") {
        cfg.linkFlags.push_back("-Wl,--export-dynamic");
        cfg.linkFlags.push_back("-ldl");
    }

    return cfg;
}