// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:analysis_server/lsp_protocol/protocol.dart';

/// The characters that will cause the editor to automatically commit the selected
/// completion item.
///
/// For example, pressing `(` at the location of `^` in the code below would
/// automatically commit the functions name and insert a `(` to avoid either having
/// to press `<enter>` and then `(` or having `()` included in the completion items
/// `insertText` (which is incorrect when passing a function around rather than
/// invoking it).
///
///     myLongFunctionName();
///     print(myLong^)
///
/// The `.` is not included because it falsely triggers whenver typing a
/// cascade (`..`), inserting the very first completion instead of just a second
/// period.
const dartCompletionCommitCharacters = ['('];

/// Set the characters that will cause the editor to automatically
/// trigger completion.
const dartCompletionTriggerCharacters = [
  '.',
  '=',
  '(',
  r'$',
  '"',
  "'",
  '{',
  '/',
  ':'
];

/// Characters that refresh signature help only if it's already open on the client.
const dartSignatureHelpRetriggerCharacters = <String>[','];

/// Characters that automatically trigger signature help when typed in the client.
const dartSignatureHelpTriggerCharacters = <String>['('];

/// Characters to trigger formatting when format-on-type is enabled.
const dartTypeFormattingCharacters = ['}', ';'];

/// A [ProgressToken] used for reporting progress when the server is analyzing.
final analyzingProgressToken = Either2<int, String>.t2('ANALYZING');

final emptyWorkspaceEdit = WorkspaceEdit();

/// Constants for command IDs that are exchanged between LSP client/server.
abstract class Commands {
  /// A list of all commands IDs that can be sent to the client to inform which
  /// commands should be sent to the server for execution (as opposed to being
  /// executed in the local plugin).
  static const serverSupportedCommands = [
    sortMembers,
    organizeImports,
    fixAll,
    sendWorkspaceEdit,
    performRefactor,
  ];
  static const sortMembers = 'edit.sortMembers';
  static const organizeImports = 'edit.organizeImports';
  static const fixAll = 'edit.fixAll';
  static const sendWorkspaceEdit = 'edit.sendWorkspaceEdit';
  static const performRefactor = 'refactor.perform';
  static const validateRefactor = 'refactor.validate';
}

abstract class CustomMethods {
  static const diagnosticServer = Method('dart/diagnosticServer');
  static const reanalyze = Method('dart/reanalyze');
  static const publishClosingLabels =
      Method('dart/textDocument/publishClosingLabels');
  static const publishOutline = Method('dart/textDocument/publishOutline');
  static const publishFlutterOutline =
      Method('dart/textDocument/publishFlutterOutline');
  static const super_ = Method('dart/textDocument/super');

  // TODO(dantup): Remove custom AnalyzerStatus status method soon as no clients
  // should be relying on it as we now support proper $/progress events.
  static const analyzerStatus = Method(r'$/analyzerStatus');

  /// Semantic tokens are dynamically registered using a single string
  /// "textDocument/semanticTokens" instead of for each individual method
  /// (full, range, full/delta) so the built-in Method class does not contain
  /// the required constant.
  static const semanticTokenDynamicRegistration =
      Method('textDocument/semanticTokens');
}

abstract class CustomSemanticTokenModifiers {
  /// A modifier applied to the identifier following the `@` annotation token to
  /// allow users to color it differently (for example in the same way as `@`).
  static const annotation = SemanticTokenModifiers('annotation');

  /// A modifier applied to control keywords like if/for/etc. so they can be
  /// colored differently to other keywords (void, import, etc), matching the
  /// original Dart textmate grammar.
  /// https://github.com/dart-lang/dart-syntax-highlight/blob/84a8e84f79bc917ebd959a4587349c865dc945e0/grammars/dart.json#L244-L261
  static const control = SemanticTokenModifiers('control');

  /// A modifier applied to the identifier for an import prefix.
  static const importPrefix = SemanticTokenModifiers('importPrefix');

  /// A modifier applied to parameter references to indicate they are the name/label
  /// to allow theming them differently to the values. For example in the code
  /// `foo({String a}) => foo(a: a)` the a's will be differentiated as:
  /// - parameter.declaration
  /// - parameter.label
  /// - parameter
  static const label = SemanticTokenModifiers('label');

  /// A modifier applied to constructors to allow coloring them differently
  /// to class names that are not constructors.
  static const constructor = SemanticTokenModifiers('constructor');

  /// A modifier applied to escape characters within a string to allow coloring
  /// them differently.
  static const escape = SemanticTokenModifiers('escape');

  /// A modifier applied to an interpolation expression in a string to allow
  /// coloring it differently to the literal parts of the string.
  ///
  /// Many tokens within interpolation expressions will get their own semantic
  /// tokens so this is mainly to account for the surrounding `${}` and
  /// tokens like parens and operators that may not get their own.
  ///
  /// This is useful for editors that supply their own basic coloring initially
  /// (for faster coloring) and then layer semantic tokens over the top. Without
  /// some marker for interpolation expressions, all otherwise-uncolored parts
  /// of the expression would show through the simple-colorings "string" colors.
  static const interpolation = SemanticTokenModifiers('interpolation');

  /// A modifier applied to instance field/getter/setter/method references and
  /// declarations to distinguish them from top-levels.
  static const instance = SemanticTokenModifiers('instance');

  /// A modifier applied to the void keyword to allow users to color it
  /// differently (for example as a type).
  static const void_ = SemanticTokenModifiers('void');

  /// All custom semantic token modifiers, used to populate the LSP Legend.
  ///
  /// The legend must include all used modifiers. Modifiers used in the
  /// HighlightRegion mappings will be automatically included, but should still
  /// be listed here in case they are removed from mappings in the future.
  static const values = [
    annotation,
    control,
    importPrefix,
    instance,
    label,
    constructor,
    escape,
    interpolation,
    void_,
  ];
}

abstract class CustomSemanticTokenTypes {
  static const annotation = SemanticTokenTypes('annotation');
  static const boolean = SemanticTokenTypes('boolean');

  /// A placeholder token type for basic source code that is not usually colored.
  ///
  /// This is used only where clients might otherwise provide their own coloring
  /// (for example coloring whole strings that may include interpolated code).
  ///
  /// Tokens using this type should generally also provide a custom
  /// [CustomSemanticTokenModifiers] to give the client more information about
  /// the reason for this token and allow specific coloring if desired.
  static const source = SemanticTokenTypes('source');

  /// All custom semantic token types, used to populate the LSP Legend which must
  /// include all used types.
  static const values = [annotation, boolean, source];
}

/// CodeActionKinds supported by the server that are not declared in the LSP spec.
abstract class DartCodeActionKind {
  /// A list of all supported CodeAction kinds, supplied to the client during
  /// initialization to allow enabling features based upon them.
  static const serverSupportedKinds = [
    CodeActionKind.Source,
    // We have to explicitly list this for the client to enable built-in command.
    CodeActionKind.SourceOrganizeImports,
    FixAll,
    SortMembers,
    CodeActionKind.QuickFix,
    CodeActionKind.Refactor,
  ];
  static const SortMembers = CodeActionKind('source.sortMembers');
  // TODO(dantup): Once this PR is merged into LSP and released, regenerated the
  //   LSP protocol code and swap this code CodeActionKind.SourceFixAll
  //   https://github.com/microsoft/language-server-protocol/pull/1308
  static const FixAll = CodeActionKind('source.fixAll');
}

abstract class ServerErrorCodes {
  // JSON-RPC reserves -32000 to -32099 for implementation-defined server-errors.
  static const ServerAlreadyStarted = ErrorCodes(-32000);
  static const UnhandledError = ErrorCodes(-32001);
  static const ServerAlreadyInitialized = ErrorCodes(-32002);
  static const InvalidFilePath = ErrorCodes(-32003);
  static const InvalidFileLineCol = ErrorCodes(-32004);
  static const UnknownCommand = ErrorCodes(-32005);
  static const InvalidCommandArguments = ErrorCodes(-32006);

  /// A file that is not part of the analyzed set.
  static const FileNotAnalyzed = ErrorCodes(-32007);
  static const FileHasErrors = ErrorCodes(-32008);
  static const ClientFailedToApplyEdit = ErrorCodes(-32009);
  static const RenameNotValid = ErrorCodes(-32010);
  static const FeatureDisabled = ErrorCodes(-32012);

  /// A file that is expected to be analyzed, but failed.
  static const FileAnalysisFailed = ErrorCodes(-32013);

  /// An error raised when the server detects that the server and client are out
  /// of sync and cannot recover. For example if a textDocument/didChange notification
  /// has invalid offsets, suggesting the client and server have become out of sync
  /// and risk invalid modifications to a file.
  ///
  /// The server should detect this error being returned, log it, then exit.
  /// The client is expected to behave as suggested in the spec:
  ///
  ///  "If a client notices that a server exists unexpectedly it should try to
  ///   restart the server. However clients should be careful to not restart a
  ///   crashing server endlessly. VS Code for example doesn't restart a server
  ///   if it crashes 5 times in the last 180 seconds."
  static const ClientServerInconsistentState = ErrorCodes(-32099);
}

/// Strings used in user prompts (window/showMessageRequest).
abstract class UserPromptActions {
  static const String yes = 'Yes';
  static const String no = 'No';
  static const String cancel = 'Cancel';
  static const String renameAnyway = 'Rename Anyway';
}