{
  pkgs,
  lib,
  config,
  ...
}:
with lib; let
  helpers = import ../../helpers.nix {inherit lib;};
  cfg = config.plugins.lsp.servers.pylsp;
in {
  # All settings are documented here:
  # https://github.com/python-lsp/python-lsp-server/blob/develop/CONFIGURATION.md

  options.plugins.lsp.servers.pylsp.settings = {
    configurationSources = mkOption {
      type = lib.types.nullOr (types.enum ["pycodestyle" "flake8"]);
      description = "List of configuration sources to use.";
      default = null;
      apply = (
        value:
          if (value != null)
          then [value]
          else null
      );
    };

    plugins = helpers.mkCompositeOption "pylsp plugins" {
      autopep8 = helpers.mkCompositeOption "autopep8 settings" {
        enabled = helpers.defaultNullOpts.mkBool true ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (autopep8).
        '';
      };

      flake8 = helpers.mkCompositeOption "flake8 settings" {
        config = helpers.mkNullOrOption types.str ''
          Path to the config file that will be the authoritative config source.
        '';

        enabled = helpers.defaultNullOpts.mkBool false ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (flake8).
        '';

        exclude = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          List of files or directories to exclude.
        '';

        executable = helpers.mkNullOrOption types.str ''
          Path to the flake8 executable.
        '';

        filename = helpers.mkNullOrOption types.str ''
          Only check for filenames matching the patterns in this list.
        '';

        hangClosing = helpers.mkNullOrOption types.bool ''
          Hang closing bracket instead of matching indentation of opening bracket's line.
        '';

        ignore = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          List of errors and warnings to ignore (or skip).
        '';

        maxComplexity = helpers.mkNullOrOption types.int ''
          Maximum allowed complexity threshold.
        '';

        maxLineLength = helpers.mkNullOrOption types.int ''
          Maximum allowed line length for the entirety of this run.
        '';

        indentSize = helpers.mkNullOrOption types.int ''
          Set indentation spaces.
        '';

        perFileIgnores = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          A pairing of filenames and violation codes that defines which violations to ignore in a
          particular file.

          For example: `["file_path.py:W305,W304"]`.
        '';

        select = helpers.mkNullOrOption (types.listOf types.str) ''
          List of errors and warnings to enable.
        '';
      };

      jedi = helpers.mkCompositeOption "jedi settings" {
        auto_import_modules =
          helpers.defaultNullOpts.mkNullable
          (types.listOf types.str)
          "[ \"numpy\" ]"
          "List of module names for `jedi.settings.auto_import_modules`.";

        extra_paths = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Define extra paths for jedi.Script.
        '';

        environment = helpers.mkNullOrOption types.str ''
          Define environment for jedi.Script and Jedi.names.
        '';
      };

      jedi_completion = helpers.mkCompositeOption "jedi_completion settings" {
        enabled = helpers.defaultNullOpts.mkBool true "Enable or disable the plugin.";

        include_params = helpers.defaultNullOpts.mkBool true ''
          Auto-completes methods and classes with tabstops for each parameter.
        '';

        include_class_objects = helpers.defaultNullOpts.mkBool false ''
          Adds class objects as a separate completion item.
        '';

        include_function_objects = helpers.defaultNullOpts.mkBool false ''
          Adds function objects as a separate completion item.
        '';

        fuzzy = helpers.defaultNullOpts.mkBool false ''
          Enable fuzzy when requesting autocomplete.
        '';

        eager = helpers.defaultNullOpts.mkBool false ''
          Resolve documentation and detail eagerly.
        '';

        resolve_at_most = helpers.defaultNullOpts.mkInt 25 ''
          How many labels and snippets (at most) should be resolved.
        '';

        cache_for =
          helpers.defaultNullOpts.mkNullable
          (types.listOf types.str)
          "[ \"pandas\" \"numpy\" \"tensorflow\" \"matplotlib\" ]"
          "Modules for which labels and snippets should be cached.";
      };

      jedi_definition = helpers.mkCompositeOption "jedi_definition settings" {
        enabled = helpers.defaultNullOpts.mkBool true "Enable or disable the plugin.";

        follow_imports = helpers.defaultNullOpts.mkBool true ''
          The goto call will follow imports.
        '';

        follow_builtin_imports = helpers.defaultNullOpts.mkBool true ''
          If follow_imports is true will decide if it follow builtin imports.
        '';

        follow_builtin_definitions = helpers.defaultNullOpts.mkBool true ''
          Follow builtin and extension definitions to stubs.
        '';
      };

      jedi_hover = helpers.mkCompositeOption "jedi_hover settings" {
        enabled = helpers.defaultNullOpts.mkBool true "Enable or disable the plugin.";
      };

      jedi_references = helpers.mkCompositeOption "jedi_references settings" {
        enabled = helpers.defaultNullOpts.mkBool true "Enable or disable the plugin.";
      };

      jedi_signature_help = helpers.mkCompositeOption "jedi_signature_help settings" {
        enabled = helpers.defaultNullOpts.mkBool true "Enable or disable the plugin.";
      };

      jedi_symbols = helpers.mkCompositeOption "jedi_symbols settings" {
        enabled = helpers.defaultNullOpts.mkBool true "Enable or disable the plugin.";

        all_scopes = helpers.defaultNullOpts.mkBool true ''
          If true lists the names of all scopes instead of only the module namespace.
        '';

        include_import_symbols = helpers.defaultNullOpts.mkBool true ''
          If true includes symbols imported from other libraries.
        '';
      };

      mccabe = helpers.mkCompositeOption "mccabe settings" {
        enabled = helpers.defaultNullOpts.mkBool true ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (mccabe).
        '';

        threshold = helpers.defaultNullOpts.mkInt 15 ''
          The minimum threshold that triggers warnings about cyclomatic complexity.
        '';
      };

      preload = helpers.mkCompositeOption "preload settings" {
        enabled = helpers.defaultNullOpts.mkBool true "Enable or disable the plugin.";

        modules = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          List of modules to import on startup.
        '';
      };

      pycodestyle = helpers.mkCompositeOption "pycodestyle settings" {
        enabled = helpers.defaultNullOpts.mkBool true ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin
          (pycodestyle).
        '';

        exclude = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Exclude files or directories which match these patterns.
        '';

        filename = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          When parsing directories, only check filenames matching these patterns.
        '';

        ropeFolder = helpers.mkNullOrOption (types.listOf types.str) ''
          Select errors and warnings.
        '';

        ignore = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Ignore errors and warnings.
        '';

        hangClosing = helpers.mkNullOrOption types.bool ''
          Hang closing bracket instead of matching indentation of opening bracket's line.
        '';

        maxLineLength = helpers.mkNullOrOption types.int ''
          Set maximum allowed line length.
        '';

        indentSize = helpers.mkNullOrOption types.int ''
          Set indentation spaces.
        '';
      };

      pydocstyle = helpers.mkCompositeOption "pydocstyle settings" {
        enabled = helpers.defaultNullOpts.mkBool false ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin
          (pydocstyle).
        '';

        convention =
          helpers.mkNullOrOption
          (types.enum [
            "pep257"
            "numpy"
            "google"
            "None"
          ])
          "Choose the basic list of checked errors by specifying an existing convention.";

        addIgnore = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Ignore errors and warnings in addition to the specified convention.
        '';

        addSelect = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Select errors and warnings in addition to the specified convention.
        '';

        ignore = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Ignore errors and warnings.
        '';

        select = helpers.mkNullOrOption (types.listOf types.str) ''
          Select errors and warnings.
        '';

        match = helpers.defaultNullOpts.mkStr "(?!test_).*\\.py" ''
          Check only files that exactly match the given regular expression;
          default is to match files that don't start with 'test_' but end with '.py'.
        '';

        matchDir = helpers.defaultNullOpts.mkStr "[^\\.].*" ''
          Search only dirs that exactly match the given regular expression;
          default is to match dirs which do not begin with a dot.
        '';
      };

      pyflakes = helpers.mkCompositeOption "pyflakes settings" {
        enabled = helpers.defaultNullOpts.mkBool true ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (pyflakes).
        '';
      };

      pylint = helpers.mkCompositeOption "pylint settings" {
        enabled = helpers.defaultNullOpts.mkBool false ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (pylint).
        '';

        args = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Arguments to pass to pylint.
        '';

        executable = helpers.mkNullOrOption types.str ''
          Executable to run pylint with.
          Enabling this will run pylint on unsaved files via stdin.
          Can slow down workflow. Only works with python3.
        '';
      };

      rope_autoimport = helpers.mkCompositeOption "rope_autoimport settings" {
        enabled = helpers.defaultNullOpts.mkBool false ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (rope).
        '';

        memory = helpers.defaultNullOpts.mkBool false ''
          Make the autoimport database memory only.
          Drastically increases startup time.
        '';
      };

      rope_completion = helpers.mkCompositeOption "rope_completion settings" {
        enabled = helpers.defaultNullOpts.mkBool false ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (rope).
        '';

        eager = helpers.defaultNullOpts.mkBool false ''
          Resolve documentation and detail eagerly.
        '';
      };

      yapf = helpers.mkCompositeOption "yapf settings" {
        enabled = helpers.defaultNullOpts.mkBool true ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin (yapf).
        '';
      };

      ### THIRD-PARTY PLUGINS
      pylsp_mypy = helpers.mkCompositeOption "pylsp_mypy settings" {
        enabled = helpers.defaultNullOpts.mkBool false ''
          Enable or disable the plugin.
          Setting this explicitely to `true` will install the dependency for this plugin
          (pylsp-mypy).
        '';

        live_mode = helpers.defaultNullOpts.mkBool true ''
          Provides type checking as you type.
          This writes to a tempfile every time a check is done.
          Turning off live_mode means you must save your changes for mypy diagnostics to update
          correctly.
        '';

        dmypy = helpers.defaultNullOpts.mkBool false ''
          Executes via dmypy run rather than mypy.
          This uses the dmypy daemon and may dramatically improve the responsiveness of the pylsp
          server, however this currently does not work in live_mode.
          Enabling this disables live_mode, even for conflicting configs.
        '';

        strict = helpers.defaultNullOpts.mkBool false ''
          Refers to the strict option of mypy.
          This option often is too strict to be useful.
        '';

        overrides =
          helpers.defaultNullOpts.mkNullable
          (with types; listOf (either bool str))
          "[true]"
          ''
            Specifies a list of alternate or supplemental command-line options.
            This modifies the options passed to mypy or the mypy-specific ones passed to dmypy run.
            When present, the special boolean member true is replaced with the command-line options that
            would've been passed had overrides not been specified.
            Later options take precedence, which allows for replacing or negating individual default
            options (see mypy.main:process_options and mypy --help | grep inverse).
          '';

        dmypy_status_file = helpers.defaultNullOpts.mkStr ".dmypy.json" ''
          Specifies which status file dmypy should use.
          This modifies the --status-file option passed to dmypy given dmypy is active.
        '';

        config_sub_paths = helpers.defaultNullOpts.mkNullable (types.listOf types.str) "[]" ''
          Specifies sub paths under which the mypy configuration file may be found.
          For each directory searched for the mypy config file, this also searches the sub paths
          specified here.
        '';

        report_progress = helpers.defaultNullOpts.mkBool false ''
          Report basic progress to the LSP client.
          With this option, pylsp-mypy will report when mypy is running, given your editor supports
          LSP progress reporting.
          For small files this might produce annoying flashing in your editor, especially in with
          live_mode.
          For large projects, enabling this can be helpful to assure yourself whether mypy is still
          running.
        '';
      };

      ### END OF THIRD-PARTY PLUGINS
    };

    rope = helpers.mkCompositeOption "rope settings" {
      extensionModules = helpers.mkNullOrOption types.str ''
        Builtin and c-extension modules that are allowed to be imported and inspected by rope.
      '';

      ropeFolder = helpers.mkNullOrOption (types.listOf types.str) ''
        The name of the folder in which rope stores project configurations and data.
        Pass null for not using such a folder at all.
      '';
    };
  };

  config =
    mkIf cfg.enable
    {
      extraPackages = with cfg.settings; let
        isNotNullAndEnabled = x: (!isNull x) && x.enabled;
      in
        optionals (!isNull cfg.settings.plugins) (
          lists.flatten (map
            (
              pluginName: (
                optionals (isNotNullAndEnabled plugins.${pluginName})
                cfg.package.optional-dependencies.${pluginName}
              )
            )
            [
              "autopep8"
              "flake8"
              "mccabe"
              "pycodestyle"
              "pydocstyle"
              "pyflakes"
              "pylint"
              "yapf"
            ])
          ++ (
            optionals
            (
              (isNotNullAndEnabled plugins.rope_autoimport)
              || (isNotNullAndEnabled plugins.rope_completion)
            )
            cfg.package.optional-dependencies.rope
          )
          ++ (
            optional (isNotNullAndEnabled plugins.pylsp_mypy)
            pkgs.python3Packages.pylsp-mypy
          )
        );
    };
}