{
  lib,
  stdenv,
  fetchFromGitHub,
  cmake,
  ninja,
  pkg-config,
  # C++ build-time dependencies
  curl,
  openssl,
  zlib,
  nlohmann_json,
  libwebsockets,
  cli11,
  # Linux system libraries (optional, enable richer features)
  systemd,
  libdrm,
  libcap,
}:

let
  # cpp-httplib is not yet in nixpkgs; pre-fetch for CMake FetchContent override.
  # The CMakeLists.txt version gate requires >= 0.26.0.
  cpp-httplib-src = fetchFromGitHub {
    owner = "yhirose";
    repo = "cpp-httplib";
    rev = "v0.26.0";
    hash = "sha256-+VPebnFMGNyChM20q4Z+kVOyI/qDLQjRsaGS0vo8kDM=";
  };
in

stdenv.mkDerivation rec {
  pname = "lemonade";
  version = "10.0.1";

  src = fetchFromGitHub {
    owner = "lemonade-sdk";
    repo = "lemonade";
    rev = "v${version}";
    hash = "sha256-aswK7OXMWTFUNHrrktf1Vx3nvTkLWMEhAgWlil1Zu2c=";
  };

  nativeBuildInputs = [
    cmake
    ninja
    pkg-config
  ];

  buildInputs = [
    curl
    openssl
    zlib
    nlohmann_json
    libwebsockets
    cli11
    systemd
    libdrm
    libcap
  ];

  cmakeFlags = [
    # Disable the web app (requires Node.js / npm at build time)
    "-DBUILD_WEB_APP=OFF"
    # Disable Linux tray app (requires GTK3 + AppIndicator3; optional)
    "-DREQUIRE_LINUX_TRAY=OFF"
    "-DCMAKE_BUILD_TYPE=Release"
    # Prevent FetchContent from reaching the network (sandbox-safe)
    "-DFETCHCONTENT_FULLY_DISCONNECTED=ON"
    # Provide pre-fetched sources for deps not in nixpkgs
    "-DFETCHCONTENT_SOURCE_DIR_HTTPLIB=${cpp-httplib-src}"
  ];

  installPhase = ''
    runHook preInstall

    mkdir -p "$out/bin"

    # HTTP server — pure OpenAI-compatible REST API, no CLI interface
    install -Dm755 lemonade-router "$out/bin/lemonade-router"

    # Console CLI client — primary user-facing tool (serve, list, pull, run,
    # status, stop, logs, recipes, …); manages the lemonade-router process
    install -Dm755 lemonade-server "$out/bin/lemonade-server"

    # Standalone HTTP-only CLI client (newer, lightweight alternative to
    # lemonade-server for scripting; requires a running lemonade-router)
    if [ -f lemonade ]; then
      install -Dm755 lemonade "$out/bin/lemonade"
    fi

    # Resources: model registry (server_models.json), backend version config,
    # and static web UI assets served by lemonade-router.
    #
    # get_resource_path() in path_utils.cpp resolves files as:
    #   <exe_dir>/resources/<file>   (first check, highest priority)
    #   /usr/share/lemonade-server/resources/<file>  (fallback)
    #
    # We install the real files under share/ and symlink bin/resources →
    # ../share/lemonade-server/resources so the first check succeeds regardless
    # of whether the Nix store path is in any of the hardcoded fallback prefixes.
    if [ -d resources ]; then
      mkdir -p "$out/share/lemonade-server/resources"
      cp -r resources/. "$out/share/lemonade-server/resources/"
      ln -s "$out/share/lemonade-server/resources" "$out/bin/resources"
    fi

    runHook postInstall
  '';

  meta = with lib; {
    description = "Local LLM server that serves optimized LLMs from GPUs and NPUs";
    longDescription = ''
      Lemonade helps users discover and run local AI apps by serving
      optimized LLMs, images, and speech directly from their own GPUs and
      NPUs.  It exposes an OpenAI-compatible REST API at
      http://localhost:8000/api/v1 and bundles a web UI, model manager,
      and CLI client.

      Binaries:
        lemonade-router  — HTTP server (OpenAI-compatible API on :8000)
        lemonade-server  — CLI client: serve, list, pull, run, status, stop, …
        lemonade         — standalone HTTP-only CLI for scripting

      Typical usage:
        lemonade-server serve            # start the server (headless on Linux)
        lemonade-server list             # browse available models
        lemonade-server pull Gemma-3-4b-it-GGUF
        lemonade-server run  Gemma-3-4b-it-GGUF
    '';
    homepage = "https://lemonade-server.ai";
    license = licenses.asl20;
    mainProgram = "lemonade-server";
    platforms = platforms.linux;
    maintainers = [ ];
  };
}