flake.nix

{
  description = "NextJS Template";

  inputs = {
    nixpkgs.url = "nixpkgs";
    systems.url = "github:nix-systems/x86_64-linux";
    utils = {
      url = "github:numtide/flake-utils";
      inputs.systems.follows = "systems";
    };
    devenv.url = "github:cachix/devenv";
  };

  nixConfig = {
    extra-trusted-public-keys = "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=";
    extra-substituters = "https://devenv.cachix.org";
  };

  outputs =
    { self
    , nixpkgs
    , utils
    , devenv
    , ...
    }@inputs:
    utils.lib.eachDefaultSystem (system:
    let
      pkgs = nixpkgs.legacyPackages.${system};
      pname = "mentor-ai-platform"; # <same as package.json name>
      version = "0.1.0";
      db = {
        enable = true;
        host = "127.0.0.1";
        port = 5432;
        name = "${pname}-db";
        user = "postgres";
      };
      buildInputs = with pkgs; [
        nodejs_20
        nodePackages_latest.pnpm
        pre-commit
      ];
      nativeBuildInputs = buildInputs;
      devPkgs = with pkgs; [
        pre-commit
        just
      ];
    in
    rec {
      devShells.default = devenv.lib.mkShell {
        inherit inputs pkgs buildInputs nativeBuildInputs;
        modules = [
          ({ lib, pkgs, config, ... }: {
            env = {
              DATABASE_URL = "postgresql://${db.user}@${db.host}:${toString(db.port)}/${db.name}";
            };

            packages = devPkgs;

            services.postgres = {
              enable = db.enable;
              package = pkgs.postgresql_16;
              initialDatabases = [{ name = db.name; }];
              initialScript = ''
                CREATE USER ${db.user} SUPERUSER;
              '';
              listen_addresses = db.host;
              port = db.port;
            };

            # pre-commit.hooks = {
            #   prettier = {
            #     enable = true;
            #     excludes = [ "pnpm-lock.yaml" "flake.lock" ];
            #     settings = {
            #       configPath = ".prettierrc";
            #     };
            #   };
            #   builder = {
            #     enable = true;
            #     name = "builder";
            #     description = "build before push";
            #     entry = "${pkgs.nodePackages_latest.pnpm}/bin/pnpm run build";
            #     stages = [ "pre-push" ];
            #     pass_filenames = false;
            #   };
            # };

            dotenv = {
              enable = true;
              filename = [ ".env.local" ".env" ];
            };

            processes = {
              pgAdmin = lib.mkIf db.enable {
                exec = "${pkgs.pgadmin4-desktopmode}/bin/pgadmin4";
              };
              next = {
                exec = "${pkgs.nodePackages_latest.pnpm}/bin/pnpm run dev";
              };
            };

            # enterShell = ''
            #   #!/usr/bin/env bash
            # if ! grep -q "pre-commit" .git/hooks/pre-commit 2>/dev/null; then
            #     pre-commit install
            # fi
            #
            #   ${pkgs.nodePackages_latest.pnpm}/bin/pnpm i
            #
            #   bin=${pkgs.tmux}/bin/tmux
            #   $bin new-session -As "${pname}:1" -n code  -d "${pkgs.neovim}/bin/nvim ."
            #   $bin new-window  -t  "${pname}:2" -n shell
            #   $bin new-window  -t  "${pname}:3" -n processes devenv up
            #
            #   $bin attach -t${pname}:1
            # '';
          })
        ];

      };

      packages = rec {
        devenv-up = self.devShells.${system}.default.config.procfileScript;
        # Executed by `nix build`
        default = devenv-up;
      };


      # Executed by `nix run`
      apps.default = utils.lib.mkApp {
        drv = packages.default;
      };
    });
}