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# SPDX-License-Identifier: AGPL-3.0-only
# Copyright 2025 Shota FUJI
#
# This program is free software: you can redistribute it and/or modify it under the terms
# of the GNU Affero General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.

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

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

        deploy-docs = pkgs.callPackage ./tools/deploy-docs { };
      in
      rec {
        packages = {
          docs = pkgs.callPackage ./docs/package.nix { };
        };

        apps = {
          # nix run .#docs
          # --------------
          # ドキュメントの開発サーバを起動する。オプションは "--" の後に指定する。
          # 例: nix run .#docs -- --help
          docs =
            let
              server = pkgs.symlinkJoin {
                name = "server-docs";

                nativeBuildInputs = [ pkgs.makeWrapper ];

                paths = [
                  (pkgs.python3.withPackages (
                    python: with python; [
                      python.mkdocs
                      python.mkdocs-material
                    ]
                  ))
                ];

                postBuild = ''
                  wrapProgram $out/bin/mkdocs \
                    --add-flags 'serve' \
                    --add-flags '--config-file' \
                    --add-flags 'docs/mkdocs.yml'
                '';
              };
            in
            {
              type = "app";
              program = "${server}/bin/mkdocs";
            };

          # nix run .#deploy-docs
          # ---------------------
          # ドキュメントをビルドしてデプロイをする。
          # リポジトリルートから実行する必要がある。
          # "docs/" で Tofu を実行して環境をセットアップしていないと失敗する。
          deploy-docs =
            let
              cmd = pkgs.symlinkJoin {
                name = "deploy-docs-wrapped";

                nativeBuildInputs = [
                  pkgs.makeWrapper
                  packages.docs
                ];

                paths = [ deploy-docs ];

                postBuild = ''
                  wrapProgram $out/bin/deploydocs \
                    --add-flags '-dir' \
                    --add-flags ${packages.docs} \
                    --add-flags '-tf-dir' \
                    --add-flags 'docs'
                '';
              };
            in
            {
              type = "app";
              program = "${cmd}/bin/deploydocs";
            };
        };

        devShell = pkgs.mkShell {
          packages =
            with pkgs;
            [
              # Official formatter for Nix code
              # https://hackage.haskell.org/package/nixfmt
              nixfmt-rfc-style

              # Copyright and license linter based on SPDX
              # https://github.com/fsfe/reuse-tool
              reuse

              # Go Programming language
              # https://go.dev/
              go

              # Official language server for the Go language
              # https://github.com/golang/tools/tree/master/gopls
              gopls
            ]
            ++ deploy-docs.buildInputs;
        };
      }
    );
}