{
  description = "Logos Bible Software — Electron wrapper + WINE installer for NixOS";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        # Shared user data path for persistent storage
        dataDir = "$HOME/.local/share/logos-app";

        # ── Electron web wrapper ──────────────────────────
        logos-electron = pkgs.writeShellApplication {
          name = "logos-web";
          runtimeInputs = [ pkgs.electron ];
          text = ''
            mkdir -p "${dataDir}"
            exec electron "${./main.js}"
          '';
        };

        # ── WINE launcher (after desktop install) ──────────
        logos-wine = pkgs.writeShellApplication {
          name = "logos";
          runtimeInputs = [ pkgs.wineWow64Packages.stagingFull ];
          text = ''
            WINEPREFIX="''${WINEPREFIX:-$HOME/.local/share/logos-wine}"
            export WINEPREFIX WINEARCH=win64

            LOGOS_EXE="$WINEPREFIX/drive_c/users/$USER/AppData/Local/Logos/Logos.exe"

            if [ ! -f "$LOGOS_EXE" ]; then
              echo "Logos not installed yet. Run: logos-install"
              exit 1
            fi

            exec wine "$LOGOS_EXE" "$@"
          '';
        };

        # ── Installer script ───────────────────────────────
        logos-install = pkgs.writeShellApplication {
          name = "logos-install";
          runtimeInputs = with pkgs; [ wineWow64Packages.stagingFull winetricks wget ];
          text = ''
            set -e
            WINEPREFIX="''${WINEPREFIX:-$HOME/.local/share/logos-wine}"
            export WINEPREFIX WINEARCH=win64

            if [ -z "$DISPLAY" ] && [ -z "$WAYLAND_DISPLAY" ]; then
              echo "ERROR: No display. Run from your desktop, not SSH."
              exit 1
            fi

            echo "=== Logos Installer ==="

            # Init WINE prefix
            if [ ! -d "$WINEPREFIX" ]; then
              echo "[1/3] Creating WINE prefix..."
              wineboot -i && wineserver -w
              winecfg -v win10
              winetricks -q corefonts
            else
              echo "[1/3] WINE prefix exists"
            fi

            # Download installer
            INSTALLER="/tmp/LogosSetup.exe"
            if [ ! -f "$INSTALLER" ]; then
              echo "[2/3] Downloading Logos installer..."
              wget -q --show-progress -O "$INSTALLER" \
                "https://downloads.logoscdn.com/LBS10/Installer/LogosSetup.exe"
            else
              echo "[2/3] Installer cached"
            fi

            echo "[3/3] Running installer — follow the GUI..."
            wine "$INSTALLER"
            echo "Done. Launch with: logos"
          '';
        };

        # ── Desktop entries ────────────────────────────────
        logos-desktop = pkgs.makeDesktopItem {
          name = "logos";
          exec = "logos";
          icon = "logos";
          desktopName = "Logos Bible Software";
          comment = "Bible study and research (WINE)";
          categories = [ "Education" "Office" ];
          terminal = false;
        };

        logos-web-desktop = pkgs.makeDesktopItem {
          name = "logos-web";
          exec = "logos-web";
          icon = "logos-web";
          desktopName = "Logos (Web)";
          comment = "Logos web app wrapper";
          categories = [ "Education" "Office" ];
          terminal = false;
        };

      in
      {
        packages = {
          default = logos-wine;
          logos = logos-wine;
          logos-web = logos-electron;
          logos-install = logos-install;
          logos-full = pkgs.symlinkJoin {
            name = "logos-full";
            paths = [
              logos-wine
              logos-electron
              logos-install
              logos-desktop
              logos-web-desktop
            ];
          };
        };

        apps = {
          default = {
            type = "app";
            program = "${logos-wine}/bin/logos";
          };
          web = {
            type = "app";
            program = "${logos-electron}/bin/logos-web";
          };
          install = {
            type = "app";
            program = "${logos-install}/bin/logos-install";
          };
        };

        devShells.default = pkgs.mkShell {
          packages = with pkgs; [
            wineWow64Packages.stagingFull
            winetricks
            electron
          ];
        };
      }
    );
}