{
  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};

        dataDir = "$HOME/.local/share/logos-app";

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

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

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

            # ── Self-bootstrap: create prefix if missing ──
            if [ ! -d "$WINEPREFIX" ]; then
              echo "═══ First run: initializing WINE prefix ═══"
              wineboot -i && wineserver -w
              winecfg -v win10
              winetricks -q corefonts 2>/dev/null
              echo "✓ WINE prefix ready"
              echo ""
            fi

            # ── Self-bootstrap: download + run installer if Logos missing ──
            if [ ! -f "$LOGOS_EXE" ]; then
              echo "═══ Logos not installed — launching installer ═══"
              INSTALLER="''${XDG_CACHE_HOME:-$HOME/.cache}/LogosSetup.exe"
              mkdir -p "$(dirname "$INSTALLER")"
              if [ ! -f "$INSTALLER" ]; then
                echo "Downloading installer..."
                wget -q --show-progress -O "$INSTALLER" \
                  "https://downloads.logoscdn.com/LBS10/Installer/LogosSetup.exe"
              fi
              echo ""
              echo "→ Follow the Logos setup wizard to sign in and download your library."
              echo "→ Next time you run 'logos' it will launch directly."
              echo ""
              wine "$INSTALLER" || {
                echo "Installer exited. If Logos is installed, re-run 'logos'."
                exit 1
              }
            fi

            if [ -f "$LOGOS_EXE" ]; then
              exec wine "$LOGOS_EXE" "$@"
            else
              echo "Logos not found after install. Try running again."
              exit 1
            fi
          '';
        };

        # ── 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;
          logos = logos;
          logos-web = logos-web;
          logos-full = pkgs.symlinkJoin {
            name = "logos-full";
            paths = [ logos logos-web logos-desktop logos-web-desktop ];
          };
        };

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

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