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# Copyright 2026 Shota FUJI
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.
#
# SPDX-License-Identifier: MPL-2.0

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

    mkElmDerivation = {
      url = "github:jeslie0/mkElmDerivation";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      mkElmDerivation,
    }:
    let
      systems = [
        "x86_64-linux"
      ];

      forEachSystems =
        f:
        nixpkgs.lib.genAttrs systems (
          system:
          f {
            inherit system;
            pkgs = nixpkgs.legacyPackages.${system};
          }
        );

      formattingPackages =
        pkgs: with pkgs; [
          # > Code formatting platform written in Rust
          # https://dprint.dev/
          dprint

          # > A source code formatter for Elm
          # https://github.com/avh4/elm-format
          elmPackages.elm-format

          # > Official formatter for Nix code
          # https://github.com/NixOS/nixfmt
          nixfmt

          # > General-purpose programming language and toolchain for maintaining robust,
          # > optimal, and reusable software
          # https://ziglang.org/
          zig
        ];
    in
    rec {
      packages = forEachSystems (
        { system, ... }:
        let
          pkgs = import nixpkgs {
            inherit system;
            overlays = [
              mkElmDerivation.overlays.default
              (final: prev: {
                custom-elements-compiler = prev.callPackage ./build/CustomElements { };
              })
            ];
          };
        in
        {
          default = pkgs.callPackage ./default.nix { };
          custom-elements-compiler = pkgs.custom-elements-compiler;
        }
      );

      formatter = forEachSystems (
        { pkgs, ... }:
        pkgs.buildFHSEnv {
          name = "dprint-fhs";
          targetPkgs = formattingPackages;
          runScript = "dprint fmt";
        }
      );

      apps = forEachSystems (
        { pkgs, ... }:
        {
          reuse = {
            type = "app";
            program = pkgs.lib.getExe pkgs.reuse;
          };

          dprint = {
            type = "app";
            program = pkgs.lib.getExe pkgs.dprint;
          };

          # Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS
          # https://caddyserver.com/
          caddy = {
            type = "app";
            program = pkgs.lib.getExe pkgs.caddy;
          };
        }
      );

      devShells = forEachSystems (
        { pkgs, system }:
        {
          default = pkgs.mkShell {
            packages =
              with pkgs;
              [
                # > Language server implementation for Elm
                # https://github.com/elm-tooling/elm-language-server
                elmPackages.elm-language-server

                # > Official language server for the Go language
                # https://github.com/golang/tools/tree/master/gopls
                gopls

                # > Zig LSP implementation + Zig Language Server
                # https://github.com/zigtools/zls
                zls
              ]
              ++ packages.${system}.default.nativeBuildInputs
              ++ packages.${system}.custom-elements-compiler.nativeBuildInputs;
          };
        }
      );
    };
}