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());

    Configuration* event = GitProject({
        .source = { .url = "https://forgejo.catcrafts.net/Catcrafts/Crafter.Event.git" },
        .args = depArgs,
    });
    Configuration* math  = GitProject({
        .source = { "https://forgejo.catcrafts.net/Catcrafts/Crafter.Math.git" },
        .args = depArgs,
    });
    Configuration* asset = GitProject({
        .source = { "https://forgejo.catcrafts.net/Catcrafts/Crafter.Asset.git" },
        .args = depArgs,
    });

    Configuration cfg;
    cfg.path = "./";
    cfg.name = "Crafter.Graphics";
    cfg.outputName = "Crafter.Graphics";
    cfg.type = ConfigurationType::LibraryStatic;
    auto opts = ApplyStandardArgs(cfg, args);
    cfg.dependencies = { event, math, asset };

    // Window backend follows the target triple. V1 had separate lib-wayland /
    // lib-win32 configurations; V2 picks the right one automatically based on
    // where the build is going. Cross-compile (`--target=...`) flips the
    // backend along with everything else. The DOM backend is reached by any
    // wasm32-* target and produces a Vulkan-free build whose Window is wired
    // to a custom JS env (see additional/dom-env.js).
    bool dom = cfg.target.find("wasm") != std::string::npos;
    bool windows = !dom
        && (cfg.target.find("windows") != std::string::npos
            || cfg.target.find("mingw") != std::string::npos);
    if (dom) {
        cfg.defines.push_back({"CRAFTER_GRAPHICS_WINDOW_DOM", ""});
        // No native window libs, no Vulkan loader, no Wayland/X11. The JS
        // bridge satisfies every dynamic symbol via wasm imports. Crafter.Build
        // strips -march/-mtune from the clang command line for any wasm32-*
        // triple, so cfg.march/mtune can stay at their defaults — keeping them
        // matches the VariantId of dependency PCMs.
        //
        // WasmAlloc / WasmFree live in Crafter.Graphics-Dom.cpp and back
        // dom-env.js's __writeUtf8 path (every keyboard / text-input event
        // routes through them). The TU defines no symbols main.cpp would
        // reference, so wasm-ld dead-strips it from libCrafter.Graphics.a
        // for examples that don't touch the `Dom::HtmlElement*` API (like
        // Sponza). `--export=` both forces the export AND pulls the
        // defining .o in — solving both halves of the dead-strip problem.
        cfg.linkFlags.push_back("-Wl,--export=WasmAlloc");
        cfg.linkFlags.push_back("-Wl,--export=WasmFree");
    } else if (windows) {
        cfg.defines.push_back({"CRAFTER_GRAPHICS_WINDOW_WIN32", ""});
        cfg.linkFlags.push_back("-lkernel32");
        cfg.linkFlags.push_back("-luser32");
        cfg.linkFlags.push_back("-lgdi32");
        // Windows.Gaming.Input (WGI) needs the WinRT activation runtime
        // and combase for HSTRING / RoGetActivationFactory.
        cfg.linkFlags.push_back("-lruntimeobject");
        cfg.linkFlags.push_back("-lcombase");
    } else {
        cfg.defines.push_back({"CRAFTER_GRAPHICS_WINDOW_WAYLAND", ""});
        cfg.linkFlags.push_back("-lwayland-client");
        cfg.linkFlags.push_back("-lxkbcommon");
        // Gamepad: libudev for hot-plug + device enumeration; libevdev
        // for event parsing + axis calibration. libevdev ships its headers
        // under a versioned dir (libevdev-1.0/) so the -I is mandatory.
        cfg.linkFlags.push_back("-ludev");
        cfg.linkFlags.push_back("-levdev");
        cfg.compileFlags.push_back("-I/usr/include/libevdev-1.0");
        cfg.cFiles.push_back("lib/xdg-shell-protocol");
        cfg.cFiles.push_back("lib/wayland-xdg-decoration-unstable-v1-client-protocol");
        cfg.cFiles.push_back("lib/fractional-scale-v1");
        cfg.cFiles.push_back("lib/viewporter");
    }

    // Vulkan is the only renderer on native targets. Software fallback is
    // provided externally via the Vulkan loader (e.g. llvmpipe / lavapipe) —
    // no separate code path. The DOM backend doesn't render in V1 (the
    // UIRenderer and every Vulkan-typed module are excluded below); the
    // WebGPU follow-up will gain its own headers/loader rather than reuse
    // the Vulkan ones.
    if (!dom) {
        ExternalDependency& vkHeaders = cfg.externalDependencies.emplace_back();
        vkHeaders.name = "Vulkan-Headers";
        vkHeaders.source.url = "https://github.com/KhronosGroup/Vulkan-Headers.git";
        vkHeaders.builder = ExternalBuilder::None;
        vkHeaders.includeDirs = { "include" };
        ExternalDependency& vkUtility = cfg.externalDependencies.emplace_back();
        vkUtility.name = "Vulkan-Utility-Libraries";
        vkUtility.source.url = "https://github.com/KhronosGroup/Vulkan-Utility-Libraries.git";
        vkUtility.builder = ExternalBuilder::None;
        vkUtility.includeDirs = { "include" };
        cfg.linkFlags.push_back(windows ? "-lvulkan-1" : "-lvulkan");
    }

    if (opts.Has("--timing")) cfg.defines.push_back({"CRAFTER_TIMING", ""});

    // One master interface list. Every partition exists on every target
    // — Crafter.Build's dependency scanner doesn't respect `#ifdef` on
    // `import :X` statements, so the partition file must be present even
    // when its body is gated out. Vulkan-typed partitions stub to empty
    // modules under CRAFTER_GRAPHICS_WINDOW_DOM; the Dom/DomEvents/Router
    // partitions stub to empty modules in the opposite direction.
    std::array<fs::path, 42> ifaces = {
        "interfaces/Crafter.Graphics",
        "interfaces/Crafter.Graphics-Animation",
        "interfaces/Crafter.Graphics-Clipboard",
        "interfaces/Crafter.Graphics-ComputeShader",
        "interfaces/Crafter.Graphics-Decompress",
        "interfaces/Crafter.Graphics-DescriptorHeapVulkan",
        "interfaces/Crafter.Graphics-DescriptorHeapWebGPU",
        "interfaces/Crafter.Graphics-Device",
        "interfaces/Crafter.Graphics-Dom",
        "interfaces/Crafter.Graphics-DomEvents",
        "interfaces/Crafter.Graphics-Font",
        "interfaces/Crafter.Graphics-FontAtlas",
        "interfaces/Crafter.Graphics-ForwardDeclarations",
        "interfaces/Crafter.Graphics-Gamepad",
        "interfaces/Crafter.Graphics-GraphicsTypes",
        "interfaces/Crafter.Graphics-Image2D",
        "interfaces/Crafter.Graphics-ImageVulkan",
        "interfaces/Crafter.Graphics-Input",
        "interfaces/Crafter.Graphics-InputField",
        "interfaces/Crafter.Graphics-Keys",
        "interfaces/Crafter.Graphics-Mesh",
        "interfaces/Crafter.Graphics-PipelineRTVulkan",
        "interfaces/Crafter.Graphics-PipelineRTWebGPU",
        "interfaces/Crafter.Graphics-PlainComputeShader",
        "interfaces/Crafter.Graphics-RenderingElement3D",
        "interfaces/Crafter.Graphics-RenderPass",
        "interfaces/Crafter.Graphics-Router",
        "interfaces/Crafter.Graphics-RT",
        "interfaces/Crafter.Graphics-RTPass",
        "interfaces/Crafter.Graphics-SamplerVulkan",
        "interfaces/Crafter.Graphics-ShaderBindingTableVulkan",
        "interfaces/Crafter.Graphics-ShaderBindingTableWebGPU",
        "interfaces/Crafter.Graphics-ShaderVulkan",
        "interfaces/Crafter.Graphics-Types",
        "interfaces/Crafter.Graphics-UI",
        "interfaces/Crafter.Graphics-UIComponents",
        "interfaces/Crafter.Graphics-VulkanBuffer",
        "interfaces/Crafter.Graphics-VulkanTransition",
        "interfaces/Crafter.Graphics-WebGPU",
        "interfaces/Crafter.Graphics-WebGPUBuffer",
        "interfaces/Crafter.Graphics-WebGPUComputeShader",
        "interfaces/Crafter.Graphics-Window",
    };

    if (dom) {
        // DOM impl set. UI-Shared.cpp is backend-agnostic; UI-WebGPU.cpp
        // is the DOM-only implementation of UIRenderer's GPU-touching
        // methods. Font / FontAtlas / UIComponents / InputField are now
        // portable.
        std::array<fs::path, 17> domImpls = {
            "implementations/Crafter.Graphics-Clipboard",
            "implementations/Crafter.Graphics-Dom",
            "implementations/Crafter.Graphics-Font",
            "implementations/Crafter.Graphics-FontAtlas",
            "implementations/Crafter.Graphics-Gamepad",
            "implementations/Crafter.Graphics-Input",
            "implementations/Crafter.Graphics-InputField",
            "implementations/Crafter.Graphics-Mesh-WebGPU",
            "implementations/Crafter.Graphics-PipelineRTWebGPU",
            "implementations/Crafter.Graphics-RenderingElement3D-WebGPU",
            "implementations/Crafter.Graphics-Router",
            "implementations/Crafter.Graphics-ShaderBindingTableWebGPU",
            "implementations/Crafter.Graphics-UI-Shared",
            "implementations/Crafter.Graphics-UI-WebGPU",
            "implementations/Crafter.Graphics-UIComponents",
            "implementations/Crafter.Graphics-WebGPUComputeShader",
            "implementations/Crafter.Graphics-Window",
        };
        cfg.GetInterfacesAndImplementations(ifaces, domImpls);
        // JS glue shipped alongside the .wasm so the loader has the
        // env-import surface the Window/Dom bindings expect.
        cfg.files.emplace_back(fs::path("additional/dom-env.js"));
        cfg.files.emplace_back(fs::path("additional/dom-webgpu.js"));
    } else {
        std::array<fs::path, 14> impls = {
            "implementations/Crafter.Graphics-Clipboard",
            "implementations/Crafter.Graphics-ComputeShader",
            "implementations/Crafter.Graphics-Device",
            "implementations/Crafter.Graphics-Font",
            "implementations/Crafter.Graphics-FontAtlas",
            "implementations/Crafter.Graphics-Gamepad",
            "implementations/Crafter.Graphics-Input",
            "implementations/Crafter.Graphics-InputField",
            "implementations/Crafter.Graphics-Mesh",
            "implementations/Crafter.Graphics-RenderingElement3D",
            "implementations/Crafter.Graphics-UI",
            "implementations/Crafter.Graphics-UI-Shared",
            "implementations/Crafter.Graphics-UIComponents",
            "implementations/Crafter.Graphics-Window",
        };
        cfg.GetInterfacesAndImplementations(ifaces, impls);

        cfg.shaders.emplace_back(fs::path("shaders/ui-quads.comp.glsl"),   std::string("main"), ShaderType::Compute);
        cfg.shaders.emplace_back(fs::path("shaders/ui-circles.comp.glsl"), std::string("main"), ShaderType::Compute);
        cfg.shaders.emplace_back(fs::path("shaders/ui-images.comp.glsl"),  std::string("main"), ShaderType::Compute);
        cfg.shaders.emplace_back(fs::path("shaders/ui-text.comp.glsl"),    std::string("main"), ShaderType::Compute);
        cfg.buildFiles.emplace_back(fs::path("shaders/ui-shared.glsl"));

        // Regression test for issue #18: drive the NVIDIA descriptor-heap
        // AS-read workaround's SPIR-V rewrite over real compiled shaders and
        // check the result with spirv-val (one push-constant block, correct
        // TLAS offset). The test executable recompiles the whole module plus
        // tests/PushConstantRewrite/main.cpp; Configuration isn't copyable
        // (it owns the parsed module list), so the shared build settings are
        // mirrored field by field. glslang and spirv-val are invoked at
        // runtime, so the test declares them as required tools. Remove with
        // the rest of the workaround.
        Test pcTest;
        Configuration& tc = pcTest.config;
        tc.path                 = cfg.path;
        tc.name                 = "PushConstantRewrite";
        tc.outputName           = "PushConstantRewrite";
        tc.type                 = ConfigurationType::Executable;
        tc.target               = cfg.target;
        tc.march                = cfg.march;
        tc.mtune                = cfg.mtune;
        tc.debug                = cfg.debug;
        tc.sysroot              = cfg.sysroot;
        tc.dependencies         = cfg.dependencies;
        tc.externalDependencies = cfg.externalDependencies;
        tc.compileFlags         = cfg.compileFlags;
        tc.linkFlags            = cfg.linkFlags;
        tc.defines              = cfg.defines;
        tc.cFiles               = cfg.cFiles;
        std::vector<fs::path> testImpls(impls.begin(), impls.end());
        testImpls.emplace_back("tests/PushConstantRewrite/main");
        tc.GetInterfacesAndImplementations(ifaces, testImpls);
        pcTest.requires_ = { "tool:glslang", "tool:spirv-val" };
        cfg.tests.push_back(std::move(pcTest));

        // Regression test for issue #32: the Wayland scroll-wheel chain
        // (wl_pointer.axis → Window::onMouseScroll). Drives the listener
        // callback directly, so it needs no compositor — but it does need
        // the Wayland backend compiled in, hence Linux-only.
        if (!windows) {
            Test scrollTest;
            Configuration& sc = scrollTest.config;
            sc.path                 = cfg.path;
            sc.name                 = "MouseScroll";
            sc.outputName           = "MouseScroll";
            sc.type                 = ConfigurationType::Executable;
            sc.target               = cfg.target;
            sc.march                = cfg.march;
            sc.mtune                = cfg.mtune;
            sc.debug                = cfg.debug;
            sc.sysroot              = cfg.sysroot;
            sc.dependencies         = cfg.dependencies;
            sc.externalDependencies = cfg.externalDependencies;
            sc.compileFlags         = cfg.compileFlags;
            sc.linkFlags            = cfg.linkFlags;
            sc.defines              = cfg.defines;
            sc.cFiles               = cfg.cFiles;
            std::vector<fs::path> scrollImpls(impls.begin(), impls.end());
            scrollImpls.emplace_back("tests/MouseScroll/main");
            sc.GetInterfacesAndImplementations(ifaces, scrollImpls);
            cfg.tests.push_back(std::move(scrollTest));
        }

        // Issue #36: BLAS build options. Drives the real hardware AS-build
        // path — records Mesh::Build / Refit / BuildProcedural /
        // RefitProcedural with fast-build/fast-trace + allow-update flags
        // into one-time command buffers and submits them, asserting the
        // requested flags land, that an allowUpdate refit keeps the AS
        // handle (in-place UPDATE), and that the validation layer reports no
        // errors. Needs a Vulkan RT device at runtime (same as the RT
        // examples), so it shares the native build settings.
        Test blasTest;
        Configuration& bc = blasTest.config;
        bc.path                 = cfg.path;
        bc.name                 = "BLASBuildOptions";
        bc.outputName           = "BLASBuildOptions";
        bc.type                 = ConfigurationType::Executable;
        bc.target               = cfg.target;
        bc.march                = cfg.march;
        bc.mtune                = cfg.mtune;
        bc.debug                = cfg.debug;
        bc.sysroot              = cfg.sysroot;
        bc.dependencies         = cfg.dependencies;
        bc.externalDependencies = cfg.externalDependencies;
        bc.compileFlags         = cfg.compileFlags;
        bc.linkFlags            = cfg.linkFlags;
        bc.defines              = cfg.defines;
        bc.cFiles               = cfg.cFiles;
        std::vector<fs::path> blasImpls(impls.begin(), impls.end());
        blasImpls.emplace_back("tests/BLASBuildOptions/main");
        bc.GetInterfacesAndImplementations(ifaces, blasImpls);
        cfg.tests.push_back(std::move(blasTest));

        // Issue #52: shaped-run cache for UIRenderer::ShapeText. Shapes a
        // string against a real CPU-side FontAtlas and asserts that a cache
        // hit is byte-equivalent to the uncached path, that hits don't touch
        // the atlas, and that translate / alignment / truncation /
        // InvalidateFont all behave. Needs a headless Vulkan device (the
        // atlas image is a real GPU image) but no swapchain — same native
        // build settings as the others. The font file is copied next to the
        // binary; the test also probes the project-root path.
        Test textTest;
        Configuration& xc = textTest.config;
        xc.path                 = cfg.path;
        xc.name                 = "ShapeTextCache";
        xc.outputName           = "ShapeTextCache";
        xc.type                 = ConfigurationType::Executable;
        xc.target               = cfg.target;
        xc.march                = cfg.march;
        xc.mtune                = cfg.mtune;
        xc.debug                = cfg.debug;
        xc.sysroot              = cfg.sysroot;
        xc.dependencies         = cfg.dependencies;
        xc.externalDependencies = cfg.externalDependencies;
        xc.compileFlags         = cfg.compileFlags;
        xc.linkFlags            = cfg.linkFlags;
        xc.defines              = cfg.defines;
        xc.cFiles               = cfg.cFiles;
        xc.files                = { fs::path("tests/ShapeTextCache/font.ttf") };
        std::vector<fs::path> textImpls(impls.begin(), impls.end());
        textImpls.emplace_back("tests/ShapeTextCache/main");
        xc.GetInterfacesAndImplementations(ifaces, textImpls);
        cfg.tests.push_back(std::move(textTest));
    }

    return cfg;
}
