declare module 'sumi-worker' {
  /**
   * Represents sources that can cause [selection change events](#window.onDidChangeTextEditorSelection).
   */
  export enum TextEditorSelectionChangeKind {
    /**
     * Selection changed due to typing in the editor.
     */
    Keyboard = 1,
    /**
     * Selection change due to clicking in the editor.
     */
    Mouse = 2,
    /**
     * Selection changed because a command ran.
     */
    Command = 3,
  }

  /**
   * Represents an event describing the change in a [text editor's selections](#TextEditor.selections).
   */
  export interface TextEditorSelectionChangeEvent {
    /**
     * The [text editor](#TextEditor) for which the selections have changed.
     */
    readonly textEditor: TextEditor;
    /**
     * The new value for the [text editor's selections](#TextEditor.selections).
     */
    readonly selections: ReadonlyArray<Selection>;
    /**
     * The [change kind](#TextEditorSelectionChangeKind) which has triggered this
     * event. Can be `undefined`.
     */
    readonly kind?: TextEditorSelectionChangeKind;
  }

  /**
   * Represents an event describing the change in a [text editor's visible ranges](#TextEditor.visibleRanges).
   */
  export interface TextEditorVisibleRangesChangeEvent {
    /**
     * The [text editor](#TextEditor) for which the visible ranges have changed.
     */
    readonly textEditor: TextEditor;
    /**
     * The new value for the [text editor's visible ranges](#TextEditor.visibleRanges).
     */
    readonly visibleRanges: ReadonlyArray<Range>;
  }

  /**
   * Represents an event describing the change in a [text editor's options](#TextEditor.options).
   */
  export interface TextEditorOptionsChangeEvent {
    /**
     * The [text editor](#TextEditor) for which the options have changed.
     */
    readonly textEditor: TextEditor;
    /**
     * The new value for the [text editor's options](#TextEditor.options).
     */
    readonly options: TextEditorOptions;
  }

  /**
   * Represents an event describing the change of a [text editor's view column](#TextEditor.viewColumn).
   */
  export interface TextEditorViewColumnChangeEvent {
    /**
     * The [text editor](#TextEditor) for which the view column has changed.
     */
    readonly textEditor: TextEditor;
    /**
     * The new value for the [text editor's view column](#TextEditor.viewColumn).
     */
    readonly viewColumn: ViewColumn;
  }

  /**
   * Rendering style of the cursor.
   */
  export enum TextEditorCursorStyle {
    /**
     * Render the cursor as a vertical thick line.
     */
    Line = 1,
    /**
     * Render the cursor as a block filled.
     */
    Block = 2,
    /**
     * Render the cursor as a thick horizontal line.
     */
    Underline = 3,
    /**
     * Render the cursor as a vertical thin line.
     */
    LineThin = 4,
    /**
     * Render the cursor as a block outlined.
     */
    BlockOutline = 5,
    /**
     * Render the cursor as a thin horizontal line.
     */
    UnderlineThin = 6,
  }

  /**
   * Rendering style of the line numbers.
   */
  export enum TextEditorLineNumbersStyle {
    /**
     * Do not render the line numbers.
     */
    Off = 0,
    /**
     * Render the line numbers.
     */
    On = 1,
    /**
     * Render the line numbers with values relative to the primary cursor location.
     */
    Relative = 2,
    /**
     * Render the line numbers on every 10th line number.
     */
    Interval = 3,
  }

  /**
   * Represents a [text editor](#TextEditor)'s [options](#TextEditor.options).
   */
  export interface TextEditorOptions {
    /**
     * The size in spaces a tab takes. This is used for two purposes:
     *  - the rendering width of a tab character;
     *  - the number of spaces to insert when [insertSpaces](#TextEditorOptions.insertSpaces) is true.
     *
     * When getting a text editor's options, this property will always be a number (resolved).
     * When setting a text editor's options, this property is optional and it can be a number or `"auto"`.
     */
    tabSize?: number | string;

    /**
     * The number of spaces to insert when {@link TextEditorOptions.insertSpaces insertSpaces} is true.
     *
     * When getting a text editor's options, this property will always be a number (resolved).
     * When setting a text editor's options, this property is optional and it can be a number or `"tabSize"`.
     */
    indentSize?: number | string;

    /**
     * When pressing Tab insert [n](#TextEditorOptions.tabSize) spaces.
     * When getting a text editor's options, this property will always be a boolean (resolved).
     * When setting a text editor's options, this property is optional and it can be a boolean or `"auto"`.
     */
    insertSpaces?: boolean | string;

    /**
     * The rendering style of the cursor in this editor.
     * When getting a text editor's options, this property will always be present.
     * When setting a text editor's options, this property is optional.
     */
    cursorStyle?: TextEditorCursorStyle;

    /**
     * Render relative line numbers w.r.t. the current line number.
     * When getting a text editor's options, this property will always be present.
     * When setting a text editor's options, this property is optional.
     */
    lineNumbers?: TextEditorLineNumbersStyle;
  }

  /**
   * Represents a handle to a set of decorations
   * sharing the same [styling options](#DecorationRenderOptions) in a [text editor](#TextEditor).
   *
   * To get an instance of a `TextEditorDecorationType` use
   * [createTextEditorDecorationType](#window.createTextEditorDecorationType).
   */
  export interface TextEditorDecorationType {
    /**
     * Internal representation of the handle.
     */
    readonly key: string;

    /**
     * Remove this decoration type and all decorations on all text editors using it.
     */
    dispose(): void;
  }

  /**
   * Represents different [reveal](#TextEditor.revealRange) strategies in a text editor.
   */
  export enum TextEditorRevealType {
    /**
     * The range will be revealed with as little scrolling as possible.
     */
    Default = 0,
    /**
     * The range will always be revealed in the center of the viewport.
     */
    InCenter = 1,
    /**
     * If the range is outside the viewport, it will be revealed in the center of the viewport.
     * Otherwise, it will be revealed with as little scrolling as possible.
     */
    InCenterIfOutsideViewport = 2,
    /**
     * The range will always be revealed at the top of the viewport.
     */
    AtTop = 3,
  }

  /**
   * Represents different positions for rendering a decoration in an [overview ruler](#DecorationRenderOptions.overviewRulerLane).
   * The overview ruler supports three lanes.
   */
  export enum OverviewRulerLane {
    Left = 1,
    Center = 2,
    Right = 4,
    Full = 7,
  }

  /**
   * Describes the behavior of decorations when typing/editing at their edges.
   */
  export enum DecorationRangeBehavior {
    /**
     * The decoration's range will widen when edits occur at the start or end.
     */
    OpenOpen = 0,
    /**
     * The decoration's range will not widen when edits occur at the start of end.
     */
    ClosedClosed = 1,
    /**
     * The decoration's range will widen when edits occur at the start, but not at the end.
     */
    OpenClosed = 2,
    /**
     * The decoration's range will widen when edits occur at the end, but not at the start.
     */
    ClosedOpen = 3,
  }

  /**
   * Represents options to configure the behavior of showing a [document](#TextDocument) in an [editor](#TextEditor).
   */
  export interface TextDocumentShowOptions {
    /**
     * An optional view column in which the [editor](#TextEditor) should be shown.
     * The default is the [active](#ViewColumn.Active), other values are adjusted to
     * be `Min(column, columnCount + 1)`, the [active](#ViewColumn.Active)-column is
     * not adjusted. Use [`ViewColumn.Beside`](#ViewColumn.Beside) to open the
     * editor to the side of the currently active one.
     */
    viewColumn?: ViewColumn;

    /**
     * An optional flag that when `true` will stop the [editor](#TextEditor) from taking focus.
     */
    preserveFocus?: boolean;

    /**
     * An optional flag that controls if an [editor](#TextEditor)-tab will be replaced
     * with the next editor or if it will be kept.
     */
    preview?: boolean;

    /**
     * An optional selection to apply for the document in the [editor](#TextEditor).
     */
    selection?: Range;
  }

  /**
   * Represents rendering styles for a [text editor decoration](#TextEditorDecorationType).
   */
  export interface DecorationRenderOptions extends ThemableDecorationRenderOptions {
    /**
     * Should the decoration be rendered also on the whitespace after the line text.
     * Defaults to `false`.
     */
    isWholeLine?: boolean;

    /**
     * Customize the growing behavior of the decoration when edits occur at the edges of the decoration's range.
     * Defaults to `DecorationRangeBehavior.OpenOpen`.
     */
    rangeBehavior?: DecorationRangeBehavior;

    /**
     * The position in the overview ruler where the decoration should be rendered.
     */
    overviewRulerLane?: OverviewRulerLane;

    /**
     * Overwrite options for light themes.
     */
    light?: ThemableDecorationRenderOptions;

    /**
     * Overwrite options for dark themes.
     */
    dark?: ThemableDecorationRenderOptions;
  }

  /**
   * Represents options for a specific decoration in a [decoration set](#TextEditorDecorationType).
   */
  export interface DecorationOptions {
    /**
     * Range to which this decoration is applied. The range must not be empty.
     */
    range: Range;

    /**
     * A message that should be rendered when hovering over the decoration.
     */
    hoverMessage?: MarkedString | MarkedString[];

    /**
     * Render options applied to the current decoration. For performance reasons, keep the
     * number of decoration specific options small, and use decoration types wherever possible.
     */
    renderOptions?: DecorationInstanceRenderOptions;
  }

  export interface ThemableDecorationInstanceRenderOptions {
    /**
     * Defines the rendering options of the attachment that is inserted before the decorated text.
     */
    before?: ThemableDecorationAttachmentRenderOptions;

    /**
     * Defines the rendering options of the attachment that is inserted after the decorated text.
     */
    after?: ThemableDecorationAttachmentRenderOptions;
  }

  export interface DecorationInstanceRenderOptions extends ThemableDecorationInstanceRenderOptions {
    /**
     * Overwrite options for light themes.
     */
    light?: ThemableDecorationInstanceRenderOptions;

    /**
     * Overwrite options for dark themes.
     */
    dark?: ThemableDecorationInstanceRenderOptions;
  }

  /**
   * Represents an editor that is attached to a [document](#TextDocument).
   */
  export interface TextEditor {
    /**
     * The document associated with this text editor. The document will be the same for the entire lifetime of this text editor.
     */
    readonly document: TextDocument;

    /**
     * The primary selection on this text editor. Shorthand for `TextEditor.selections[0]`.
     */
    selection: Selection;

    /**
     * The selections in this text editor. The primary selection is always at index 0.
     */
    selections: Selection[];

    /**
     * The current visible ranges in the editor (vertically).
     * This accounts only for vertical scrolling, and not for horizontal scrolling.
     */
    readonly visibleRanges: Range[];

    /**
     * Text editor options.
     */
    options: TextEditorOptions;

    /**
     * The column in which this editor shows. Will be `undefined` in case this
     * isn't one of the main editors, e.g. an embedded editor, or when the editor
     * column is larger than three.
     */
    viewColumn?: ViewColumn;

    /**
     * Perform an edit on the document associated with this text editor.
     *
     * The given callback-function is invoked with an [edit-builder](#TextEditorEdit) which must
     * be used to make edits. Note that the edit-builder is only valid while the
     * callback executes.
     *
     * @param callback A function which can create edits using an [edit-builder](#TextEditorEdit).
     * @param options The undo/redo behavior around this edit. By default, undo stops will be created before and after this edit.
     * @return A promise that resolves with a value indicating if the edits could be applied.
     */
    edit(
      callback: (editBuilder: TextEditorEdit) => void,
      options?: { undoStopBefore: boolean; undoStopAfter: boolean },
    ): Thenable<boolean>;

    /**
     * Insert a [snippet](#SnippetString) and put the editor into snippet mode. "Snippet mode"
     * means the editor adds placeholders and additional cursors so that the user can complete
     * or accept the snippet.
     *
     * @param snippet The snippet to insert in this edit.
     * @param location Position or range at which to insert the snippet, defaults to the current editor selection or selections.
     * @param options The undo/redo behavior around this edit. By default, undo stops will be created before and after this edit.
     * @return A promise that resolves with a value indicating if the snippet could be inserted. Note that the promise does not signal
     * that the snippet is completely filled-in or accepted.
     */
    insertSnippet(
      snippet: SnippetString,
      location?: Position | Range | ReadonlyArray<Position> | ReadonlyArray<Range>,
      options?: { undoStopBefore: boolean; undoStopAfter: boolean },
    ): Thenable<boolean>;

    /**
     * Adds a set of decorations to the text editor. If a set of decorations already exists with
     * the given [decoration type](#TextEditorDecorationType), they will be replaced.
     *
     * @see [createTextEditorDecorationType](#window.createTextEditorDecorationType).
     *
     * @param decorationType A decoration type.
     * @param rangesOrOptions Either [ranges](#Range) or more detailed [options](#DecorationOptions).
     */
    setDecorations(decorationType: TextEditorDecorationType, rangesOrOptions: Range[] | DecorationOptions[]): void;

    /**
     * Scroll as indicated by `revealType` in order to reveal the given range.
     *
     * @param range A range.
     * @param revealType The scrolling strategy for revealing `range`.
     */
    revealRange(range: Range, revealType?: TextEditorRevealType): void;

    /**
     * ~~Show the text editor.~~
     *
     * @deprecated Use [window.showTextDocument](#window.showTextDocument) instead.
     *
     * @param column The [column](#ViewColumn) in which to show this editor.
     * This method shows unexpected behavior and will be removed in the next major update.
     */
    show(column?: ViewColumn): void;

    /**
     * ~~Hide the text editor.~~
     *
     * @deprecated Use the command `workbench.action.closeActiveEditor` instead.
     * This method shows unexpected behavior and will be removed in the next major update.
     */
    hide(): void;
  }

  export interface TextEditorEdit {
    /**
     * Replace a certain text region with a new value.
     * You can use \r\n or \n in `value` and they will be normalized to the current [document](#TextDocument).
     *
     * @param location The range this operation should remove.
     * @param value The new text this operation should insert after removing `location`.
     */
    replace(location: Position | Range | Selection, value: string): void;

    /**
     * Insert text at a location.
     * You can use \r\n or \n in `value` and they will be normalized to the current [document](#TextDocument).
     * Although the equivalent text edit can be made with [replace](#TextEditorEdit.replace), `insert` will produce a different resulting selection (it will get moved).
     *
     * @param location The position where the new text should be inserted.
     * @param value The new text this operation should insert.
     */
    insert(location: Position, value: string): void;

    /**
     * Delete a certain text region.
     *
     * @param location The range this operation should remove.
     */
    delete(location: Range | Selection): void;

    /**
     * Set the end of line sequence.
     *
     * @param endOfLine The new end of line for the [document](#TextDocument).
     */
    setEndOfLine(endOfLine: EndOfLine): void;
  }

  /**
   * Denotes a location of an editor in the window. Editors can be arranged in a grid
   * and each column represents one editor location in that grid by counting the editors
   * in order of their appearance.
   */
  export enum ViewColumn {
    /**
     * A *symbolic* editor column representing the currently active column. This value
     * can be used when opening editors, but the *resolved* [viewColumn](#TextEditor.viewColumn)-value
     * of editors will always be `One`, `Two`, `Three`,... or `undefined` but never `Active`.
     */
    Active = -1,
    /**
     * A *symbolic* editor column representing the column to the side of the active one. This value
     * can be used when opening editors, but the *resolved* [viewColumn](#TextEditor.viewColumn)-value
     * of editors will always be `One`, `Two`, `Three`,... or `undefined` but never `Beside`.
     */
    Beside = -2,
    /**
     * The first editor column.
     */
    One = 1,
    /**
     * The second editor column.
     */
    Two = 2,
    /**
     * The third editor column.
     */
    Three = 3,
    /**
     * The fourth editor column.
     */
    Four = 4,
    /**
     * The fifth editor column.
     */
    Five = 5,
    /**
     * The sixth editor column.
     */
    Six = 6,
    /**
     * The seventh editor column.
     */
    Seven = 7,
    /**
     * The eighth editor column.
     */
    Eight = 8,
    /**
     * The ninth editor column.
     */
    Nine = 9,
  }

  /**
   * Additional data about a workspace edit.
   */
  export interface WorkspaceEditMetadata {
    /**
     * Signal to the editor that this edit is a refactoring.
     */
    isRefactoring?: boolean;
  }

  export namespace workspace {
    /**
     * Make changes to one or many resources or create, delete, and rename resources as defined by the given
     * {@link WorkspaceEdit workspace edit}.
     *
     * All changes of a workspace edit are applied in the same order in which they have been added. If
     * multiple textual inserts are made at the same position, these strings appear in the resulting text
     * in the order the 'inserts' were made, unless that are interleaved with resource edits. Invalid sequences
     * like 'delete file a' -> 'insert text in file a' cause failure of the operation.
     *
     * When applying a workspace edit that consists only of text edits an 'all-or-nothing'-strategy is used.
     * A workspace edit with resource creations or deletions aborts the operation, e.g. consecutive edits will
     * not be attempted, when a single edit fails.
     *
     * @param edit A workspace edit.
     * @param metadata Optional {@link WorkspaceEditMetadata metadata} for the edit.
     * @returns A thenable that resolves when the edit could be applied.
     */
    export function applyEdit(edit: WorkspaceEdit, metadata?: WorkspaceEditMetadata): Thenable<boolean>;
  }

  export namespace window {
    /**
     * The currently active editor or `undefined`. The active editor is the one
     * that currently has focus or, when none has focus, the one that has changed
     * input most recently.
     */
    export let activeTextEditor: TextEditor | undefined;

    /**
     * The currently visible editors or an empty array.
     */
    export let visibleTextEditors: TextEditor[];

    /**
     * An [event](#Event) which fires when the [active editor](#window.activeTextEditor)
     * has changed. *Note* that the event also fires when the active editor changes
     * to `undefined`.
     */
    export const onDidChangeActiveTextEditor: Event<TextEditor | undefined>;

    /**
     * An [event](#Event) which fires when the array of [visible editors](#window.visibleTextEditors)
     * has changed.
     */
    export const onDidChangeVisibleTextEditors: Event<TextEditor[]>;

    /**
     * An [event](#Event) which fires when the selection in an editor has changed.
     */
    export const onDidChangeTextEditorSelection: Event<TextEditorSelectionChangeEvent>;

    /**
     * An [event](#Event) which fires when the visible ranges of an editor has changed.
     */
    export const onDidChangeTextEditorVisibleRanges: Event<TextEditorVisibleRangesChangeEvent>;

    /**
     * An [event](#Event) which fires when the options of an editor have changed.
     */
    export const onDidChangeTextEditorOptions: Event<TextEditorOptionsChangeEvent>;

    /**
     * An [event](#Event) which fires when the view column of an editor has changed.
     */
    export const onDidChangeTextEditorViewColumn: Event<TextEditorViewColumnChangeEvent>;

    /**
     * Show the given document in a text editor. A [column](#ViewColumn) can be provided
     * to control where the editor is being shown. Might change the [active editor](#window.activeTextEditor).
     *
     * @param document A text document to be shown.
     * @param column A view column in which the [editor](#TextEditor) should be shown. The default is the [active](#ViewColumn.Active), other values
     * are adjusted to be `Min(column, columnCount + 1)`, the [active](#ViewColumn.Active)-column is not adjusted. Use [`ViewColumn.Beside`](#ViewColumn.Beside)
     * to open the editor to the side of the currently active one.
     * @param preserveFocus When `true` the editor will not take focus.
     * @return A promise that resolves to an [editor](#TextEditor).
     */
    export function showTextDocument(
      document: TextDocument,
      column?: ViewColumn,
      preserveFocus?: boolean,
    ): Thenable<TextEditor>;

    /**
     * A short-hand for `openTextDocument(uri).then(document => showTextDocument(document, options))`.
     *
     * @see [openTextDocument](#openTextDocument)
     *
     * @param document A resource identifier.
     * @param options [Editor options](#TextDocumentShowOptions) to configure the behavior of showing the [editor](#TextEditor).
     * @return A promise that resolves to an [editor](#TextEditor).
     */
    export function showTextDocument(
      document: Uri | TextDocument,
      options?: TextDocumentShowOptions,
    ): Thenable<TextEditor>;

    /**
     * Create a TextEditorDecorationType that can be used to add decorations to text editors.
     *
     * @param options Rendering options for the decoration type.
     * @return A new decoration type instance.
     */
    export function createTextEditorDecorationType(options: DecorationRenderOptions): TextEditorDecorationType;
  }

  export class TextEdit {
    /**
     * Utility to create a replace edit.
     *
     * @param range A range.
     * @param newText A string.
     * @return A new text edit object.
     */
    static replace(range: Range, newText: string): TextEdit;

    /**
     * Utility to create an insert edit.
     *
     * @param position A position, will become an empty range.
     * @param newText A string.
     * @return A new text edit object.
     */
    static insert(position: Position, newText: string): TextEdit;

    /**
     * Utility to create a delete edit.
     *
     * @param range A range.
     * @return A new text edit object.
     */
    static delete(range: Range): TextEdit;

    /**
     * Utility to create an eol-edit.
     *
     * @param eol An eol-sequence
     * @return A new text edit object.
     */
    static setEndOfLine(eol: EndOfLine): TextEdit;

    /**
     * The range this edit applies to.
     */
    range: Range;

    /**
     * The string this edit will insert.
     */
    newText: string;

    /**
     * The eol-sequence used in the document.
     *
     * *Note* that the eol-sequence will be applied to the
     * whole document.
     */
    newEol: EndOfLine;

    /**
     * Create a new TextEdit.
     *
     * @param range A range.
     * @param newText A string.
     */
    constructor(range: Range, newText: string);
  }
}