# Standard Unix password manager
{
  config,
  lib,
  pkgs,
  ...
}:
let
  gopassKeys = config.security.ssh.gopassKeys;

  gopassSshLoadScript = pkgs.writeShellApplication {
    name = "gopass-ssh-load";
    runtimeInputs = [
      config.security.gopass.package
      config.security.gpg.package
      config.security.ssh.package
      pkgs.bash
    ];
    text =
      builtins.replaceStrings
        [
          "@@GOPASS_SSH_KEYS@@"
          "@@GNUPGHOME@@"
        ]
        [
          (lib.concatStringsSep " " gopassKeys)
          config.home.sessionVariables.GNUPGHOME
        ]
        (builtins.readFile ./gopass-ssh-load.sh);
  };
in
{
  options.security.gopass = {
    enable = lib.mkEnableOption "Enables gopass.";
    package = lib.mkOption {
      type = lib.types.package;
      readOnly = true;
      default = config.programs.password-store.package;
      description = "The gopass package to use.";
    };
    ssh-agent = {
      enable = lib.mkEnableOption "gopass-backed SSH keys for git";
      package = lib.mkOption {
        type = lib.types.package;
        readOnly = true;
        default = gopassSshLoadScript;
        description = "The gopass-ssh-load script package.";
      };
    };
    sync = {
      enable = lib.mkEnableOption "Enables git-backed syncing of the gopass data directory.";
      remote = lib.mkOption {
        type = lib.types.nullOr lib.types.str;
        default = null;
        description = "Git remote URL for the gopass data directory. Use an https:// URL if 'credential' is configured.";
      };
      credential = {
        username = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
          description = "Username for HTTPS git authentication against the gopass remote.";
        };
        passwordGopassPath = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
          description = "gopass entry path holding the password or token used.";
        };
      };
    };
  };

  config = lib.mkMerge [
    (lib.mkIf config.security.gopass.enable {
      programs.password-store = {
        enable = true;
        package = pkgs.gopass.override { passAlias = true; };
        settings = {
          PASSWORD_STORE_DIR = "${config.home.homeDirectory}/.local/share/pass";
        };
      };

      # use a different username and email to show these commits are auto
      # generated by gopass
      programs.git.includes = lib.mkIf config.development.git.enable [
        {
          condition = "gitdir:${config.programs.password-store.settings.PASSWORD_STORE_DIR}/";
          contents = {
            user = {
              name = "Gopass of ${config.home.username}";
              email = "${config.home.username}@gopass.localhost";
            };
            commit = {
              gpgSign = false;
            };
            tag = {
              gpgSign = false;
            };
          }
          //
            lib.optionalAttrs
              (
                config.security.gopass.sync.enable
                && config.security.gopass.sync.credential.passwordGopassPath != null
              )
              {
                credential.helper = "!f() { echo username=${lib.escapeShellArg config.security.gopass.sync.credential.username}; echo password=\"$(${config.security.gopass.package}/bin/gopass show -o ${lib.escapeShellArg config.security.gopass.sync.credential.passwordGopassPath})\"; }; f";
              };
        }
      ];

      home.sessionVariables = {
        PASSWORD_STORE_DIR = config.programs.password-store.settings.PASSWORD_STORE_DIR;
      };

      home.file.".local/share/icons/hicolor/scalable/apps/gopass.svg" = {
        source = ../../../assets/icons/apps/gopass.svg;
      };

      xdg.desktopEntries."gopass" = {
        name = "gopass";
        exec = "${lib.getExe config.terminal.kitty.package} --class gopass -e ${lib.getExe config.security.gopass.package}";
        icon = "gopass";
        comment = "Standard Unix password manager (Go implementation)";
        categories = [ "Utility" ];
        terminal = false;
        type = "Application";
      };
    })

    (lib.mkIf config.security.gopass.ssh-agent.enable {
      home.packages = [ config.security.gopass.ssh-agent.package ];
    })

    (lib.mkIf config.security.gopass.sync.enable {
      home.activation.gopassSyncInit =
        let
          gopassSyncInit = pkgs.writeShellApplication {
            name = "gopass-sync-init";
            runtimeInputs = [
              pkgs.bash
              config.development.git.package
            ];
            text =
              builtins.replaceStrings
                [ "@@PASSWORD_STORE_DIR@@" "@@REMOTE_REPO_URL@@" ]
                [ config.programs.password-store.settings.PASSWORD_STORE_DIR config.security.gopass.sync.remote ]
                (builtins.readFile ./gopass-sync-init.sh);
          };
        in
        lib.hm.dag.entryAfter [ "writeBoundary" ] ''
          run ${lib.getExe gopassSyncInit} || true
        '';
    })
  ];
}