/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the Source EULA. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { VSBuffer } from 'vs/base/common/buffer';
import { CancellationToken } from 'vs/base/common/cancellation';
import { Codicon } from 'vs/base/common/codicons';
import { Color } from 'vs/base/common/color';
import { IReadonlyVSDataTransfer } from 'vs/base/common/dataTransfer';
import { Event } from 'vs/base/common/event';
import { IMarkdownString } from 'vs/base/common/htmlContent';
import { IDisposable } from 'vs/base/common/lifecycle';
import { ThemeIcon } from 'vs/base/common/themables';
import { URI, UriComponents } from 'vs/base/common/uri';
import { ISingleEditOperation } from 'vs/editor/common/core/editOperation';
import { IPosition, Position } from 'vs/editor/common/core/position';
import { IRange, Range } from 'vs/editor/common/core/range';
import { Selection } from 'vs/editor/common/core/selection';
import { LanguageId } from 'vs/editor/common/encodedTokenAttributes';
import * as model from 'vs/editor/common/model';
import { TokenizationRegistry as TokenizationRegistryImpl } from 'vs/editor/common/tokenizationRegistry';
import { ContiguousMultilineTokens } from 'vs/editor/common/tokens/contiguousMultilineTokens';
import { ExtensionIdentifier } from 'vs/platform/extensions/common/extensions';
import { IMarkerData } from 'vs/platform/markers/common/markers';

/**
 * @internal
 */
export interface ILanguageIdCodec {
	encodeLanguageId(languageId: string): LanguageId;
	decodeLanguageId(languageId: LanguageId): string;
}

export class Token {
	_tokenBrand: void = undefined;

	constructor(
		public readonly offset: number,
		public readonly type: string,
		public readonly language: string,
	) {
	}

	public toString(): string {
		return '(' + this.offset + ', ' + this.type + ')';
	}
}

/**
 * @internal
 */
export class TokenizationResult {
	_tokenizationResultBrand: void = undefined;

	constructor(
		public readonly tokens: Token[],
		public readonly endState: IState,
	) {
	}
}

/**
 * @internal
 */
export class EncodedTokenizationResult {
	_encodedTokenizationResultBrand: void = undefined;

	constructor(
		/**
		 * The tokens in binary format. Each token occupies two array indices. For token i:
		 *  - at offset 2*i => startIndex
		 *  - at offset 2*i + 1 => metadata
		 *
		 */
		public readonly tokens: Uint32Array,
		public readonly endState: IState,
	) {
	}
}

/**
 * @internal
 */
export interface IBackgroundTokenizer extends IDisposable {
	/**
	 * Instructs the background tokenizer to set the tokens for the given range again.
	 *
	 * This might be necessary if the renderer overwrote those tokens with heuristically computed ones for some viewport,
	 * when the change does not even propagate to that viewport.
	 */
	requestTokens(startLineNumber: number, endLineNumberExclusive: number): void;

	reportMismatchingTokens?(lineNumber: number): void;
}


/**
 * @internal
 */
export interface ITokenizationSupport {
	/**
	 * If true, the background tokenizer will only be used to verify tokens against the default background tokenizer.
	 * Used for debugging.
	 */
	readonly backgroundTokenizerShouldOnlyVerifyTokens?: boolean;

	getInitialState(): IState;

	tokenize(line: string, hasEOL: boolean, state: IState): TokenizationResult;

	tokenizeEncoded(line: string, hasEOL: boolean, state: IState): EncodedTokenizationResult;

	/**
	 * Can be/return undefined if default background tokenization should be used.
	 */
	createBackgroundTokenizer?(textModel: model.ITextModel, store: IBackgroundTokenizationStore): IBackgroundTokenizer | undefined;
}

/**
 * @internal
 */
export interface IBackgroundTokenizationStore {
	setTokens(tokens: ContiguousMultilineTokens[]): void;

	setEndState(lineNumber: number, state: IState): void;

	/**
	 * Should be called to indicate that the background tokenization has finished for now.
	 * (This triggers bracket pair colorization to re-parse the bracket pairs with token information)
	 */
	backgroundTokenizationFinished(): void;
}

/**
 * The state of the tokenizer between two lines.
 * It is useful to store flags such as in multiline comment, etc.
 * The model will clone the previous line's state and pass it in to tokenize the next line.
 */
export interface IState {
	clone(): IState;
	equals(other: IState): boolean;
}

/**
 * A provider result represents the values a provider, like the {@link HoverProvider},
 * may return. For once this is the actual result type `T`, like `Hover`, or a thenable that resolves
 * to that type `T`. In addition, `null` and `undefined` can be returned - either directly or from a
 * thenable.
 */
export type ProviderResult<T> = T | undefined | null | Thenable<T | undefined | null>;

/**
 * A hover represents additional information for a symbol or word. Hovers are
 * rendered in a tooltip-like widget.
 */
export interface Hover {
	/**
	 * The contents of this hover.
	 */
	contents: IMarkdownString[];

	/**
	 * The range to which this hover applies. When missing, the
	 * editor will use the range at the current position or the
	 * current position itself.
	 */
	range?: IRange;
}

/**
 * The hover provider interface defines the contract between extensions and
 * the [hover](https://code.visualstudio.com/docs/editor/intellisense)-feature.
 */
export interface HoverProvider {
	/**
	 * Provide a hover for the given position and document. Multiple hovers at the same
	 * position will be merged by the editor. A hover can have a range which defaults
	 * to the word range at the position when omitted.
	 */
	provideHover(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<Hover>;
}

/**
 * An evaluatable expression represents additional information for an expression in a document. Evaluatable expressions are
 * evaluated by a debugger or runtime and their result is rendered in a tooltip-like widget.
 * @internal
 */
export interface EvaluatableExpression {
	/**
	 * The range to which this expression applies.
	 */
	range: IRange;
	/**
	 * This expression overrides the expression extracted from the range.
	 */
	expression?: string;
}


/**
 * The evaluatable expression provider interface defines the contract between extensions and
 * the debug hover.
 * @internal
 */
export interface EvaluatableExpressionProvider {
	/**
	 * Provide a hover for the given position and document. Multiple hovers at the same
	 * position will be merged by the editor. A hover can have a range which defaults
	 * to the word range at the position when omitted.
	 */
	provideEvaluatableExpression(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<EvaluatableExpression>;
}

/**
 * A value-object that contains contextual information when requesting inline values from a InlineValuesProvider.
 * @internal
 */
export interface InlineValueContext {
	frameId: number;
	stoppedLocation: Range;
}

/**
 * Provide inline value as text.
 * @internal
 */
export interface InlineValueText {
	type: 'text';
	range: IRange;
	text: string;
}

/**
 * Provide inline value through a variable lookup.
 * @internal
 */
export interface InlineValueVariableLookup {
	type: 'variable';
	range: IRange;
	variableName?: string;
	caseSensitiveLookup: boolean;
}

/**
 * Provide inline value through an expression evaluation.
 * @internal
 */
export interface InlineValueExpression {
	type: 'expression';
	range: IRange;
	expression?: string;
}

/**
 * Inline value information can be provided by different means:
 * - directly as a text value (class InlineValueText).
 * - as a name to use for a variable lookup (class InlineValueVariableLookup)
 * - as an evaluatable expression (class InlineValueEvaluatableExpression)
 * The InlineValue types combines all inline value types into one type.
 * @internal
 */
export type InlineValue = InlineValueText | InlineValueVariableLookup | InlineValueExpression;

/**
 * The inline values provider interface defines the contract between extensions and
 * the debugger's inline values feature.
 * @internal
 */
export interface InlineValuesProvider {
	/**
	 */
	onDidChangeInlineValues?: Event<void> | undefined;
	/**
	 * Provide the "inline values" for the given range and document. Multiple hovers at the same
	 * position will be merged by the editor. A hover can have a range which defaults
	 * to the word range at the position when omitted.
	 */
	provideInlineValues(model: model.ITextModel, viewPort: Range, context: InlineValueContext, token: CancellationToken): ProviderResult<InlineValue[]>;
}

export const enum CompletionItemKind {
	Method,
	Function,
	Constructor,
	Field,
	Variable,
	Class,
	Struct,
	Interface,
	Module,
	Property,
	Event,
	Operator,
	Unit,
	Value,
	Constant,
	Enum,
	EnumMember,
	Keyword,
	Text,
	Color,
	File,
	Reference,
	Customcolor,
	Folder,
	TypeParameter,
	User,
	Issue,
	Snippet, // <- highest value (used for compare!)
}

/**
 * @internal
 */
export namespace CompletionItemKinds {

	const byKind = new Map<CompletionItemKind, ThemeIcon>();
	byKind.set(CompletionItemKind.Method, Codicon.symbolMethod);
	byKind.set(CompletionItemKind.Function, Codicon.symbolFunction);
	byKind.set(CompletionItemKind.Constructor, Codicon.symbolConstructor);
	byKind.set(CompletionItemKind.Field, Codicon.symbolField);
	byKind.set(CompletionItemKind.Variable, Codicon.symbolVariable);
	byKind.set(CompletionItemKind.Class, Codicon.symbolClass);
	byKind.set(CompletionItemKind.Struct, Codicon.symbolStruct);
	byKind.set(CompletionItemKind.Interface, Codicon.symbolInterface);
	byKind.set(CompletionItemKind.Module, Codicon.symbolModule);
	byKind.set(CompletionItemKind.Property, Codicon.symbolProperty);
	byKind.set(CompletionItemKind.Event, Codicon.symbolEvent);
	byKind.set(CompletionItemKind.Operator, Codicon.symbolOperator);
	byKind.set(CompletionItemKind.Unit, Codicon.symbolUnit);
	byKind.set(CompletionItemKind.Value, Codicon.symbolValue);
	byKind.set(CompletionItemKind.Enum, Codicon.symbolEnum);
	byKind.set(CompletionItemKind.Constant, Codicon.symbolConstant);
	byKind.set(CompletionItemKind.Enum, Codicon.symbolEnum);
	byKind.set(CompletionItemKind.EnumMember, Codicon.symbolEnumMember);
	byKind.set(CompletionItemKind.Keyword, Codicon.symbolKeyword);
	byKind.set(CompletionItemKind.Snippet, Codicon.symbolSnippet);
	byKind.set(CompletionItemKind.Text, Codicon.symbolText);
	byKind.set(CompletionItemKind.Color, Codicon.symbolColor);
	byKind.set(CompletionItemKind.File, Codicon.symbolFile);
	byKind.set(CompletionItemKind.Reference, Codicon.symbolReference);
	byKind.set(CompletionItemKind.Customcolor, Codicon.symbolCustomColor);
	byKind.set(CompletionItemKind.Folder, Codicon.symbolFolder);
	byKind.set(CompletionItemKind.TypeParameter, Codicon.symbolTypeParameter);
	byKind.set(CompletionItemKind.User, Codicon.account);
	byKind.set(CompletionItemKind.Issue, Codicon.issues);

	/**
	 * @internal
	 */
	export function toIcon(kind: CompletionItemKind): ThemeIcon {
		let codicon = byKind.get(kind);
		if (!codicon) {
			console.info('No codicon found for CompletionItemKind ' + kind);
			codicon = Codicon.symbolProperty;
		}
		return codicon;
	}

	const data = new Map<string, CompletionItemKind>();
	data.set('method', CompletionItemKind.Method);
	data.set('function', CompletionItemKind.Function);
	data.set('constructor', <any>CompletionItemKind.Constructor);
	data.set('field', CompletionItemKind.Field);
	data.set('variable', CompletionItemKind.Variable);
	data.set('class', CompletionItemKind.Class);
	data.set('struct', CompletionItemKind.Struct);
	data.set('interface', CompletionItemKind.Interface);
	data.set('module', CompletionItemKind.Module);
	data.set('property', CompletionItemKind.Property);
	data.set('event', CompletionItemKind.Event);
	data.set('operator', CompletionItemKind.Operator);
	data.set('unit', CompletionItemKind.Unit);
	data.set('value', CompletionItemKind.Value);
	data.set('constant', CompletionItemKind.Constant);
	data.set('enum', CompletionItemKind.Enum);
	data.set('enum-member', CompletionItemKind.EnumMember);
	data.set('enumMember', CompletionItemKind.EnumMember);
	data.set('keyword', CompletionItemKind.Keyword);
	data.set('snippet', CompletionItemKind.Snippet);
	data.set('text', CompletionItemKind.Text);
	data.set('color', CompletionItemKind.Color);
	data.set('file', CompletionItemKind.File);
	data.set('reference', CompletionItemKind.Reference);
	data.set('customcolor', CompletionItemKind.Customcolor);
	data.set('folder', CompletionItemKind.Folder);
	data.set('type-parameter', CompletionItemKind.TypeParameter);
	data.set('typeParameter', CompletionItemKind.TypeParameter);
	data.set('account', CompletionItemKind.User);
	data.set('issue', CompletionItemKind.Issue);

	/**
	 * @internal
	 */
	export function fromString(value: string): CompletionItemKind;
	/**
	 * @internal
	 */
	export function fromString(value: string, strict: true): CompletionItemKind | undefined;
	/**
	 * @internal
	 */
	export function fromString(value: string, strict?: boolean): CompletionItemKind | undefined {
		let res = data.get(value);
		if (typeof res === 'undefined' && !strict) {
			res = CompletionItemKind.Property;
		}
		return res;
	}
}

export interface CompletionItemLabel {
	label: string;
	detail?: string;
	description?: string;
}

export const enum CompletionItemTag {
	Deprecated = 1
}

export const enum CompletionItemInsertTextRule {
	None = 0,

	/**
	 * Adjust whitespace/indentation of multiline insert texts to
	 * match the current line indentation.
	 */
	KeepWhitespace = 0b001,

	/**
	 * `insertText` is a snippet.
	 */
	InsertAsSnippet = 0b100,
}

export interface CompletionItemRanges {
	insert: IRange;
	replace: IRange;
}

/**
 * A completion item represents a text snippet that is
 * proposed to complete text that is being typed.
 */
export interface CompletionItem {
	/**
	 * The label of this completion item. By default
	 * this is also the text that is inserted when selecting
	 * this completion.
	 */
	label: string | CompletionItemLabel;
	/**
	 * The kind of this completion item. Based on the kind
	 * an icon is chosen by the editor.
	 */
	kind: CompletionItemKind;
	/**
	 * A modifier to the `kind` which affect how the item
	 * is rendered, e.g. Deprecated is rendered with a strikeout
	 */
	tags?: ReadonlyArray<CompletionItemTag>;
	/**
	 * A human-readable string with additional information
	 * about this item, like type or symbol information.
	 */
	detail?: string;
	/**
	 * A human-readable string that represents a doc-comment.
	 */
	documentation?: string | IMarkdownString;
	/**
	 * A string that should be used when comparing this item
	 * with other items. When `falsy` the {@link CompletionItem.label label}
	 * is used.
	 */
	sortText?: string;
	/**
	 * A string that should be used when filtering a set of
	 * completion items. When `falsy` the {@link CompletionItem.label label}
	 * is used.
	 */
	filterText?: string;
	/**
	 * Select this item when showing. *Note* that only one completion item can be selected and
	 * that the editor decides which item that is. The rule is that the *first* item of those
	 * that match best is selected.
	 */
	preselect?: boolean;
	/**
	 * A string or snippet that should be inserted in a document when selecting
	 * this completion.
	 */
	insertText: string;
	/**
	 * Additional rules (as bitmask) that should be applied when inserting
	 * this completion.
	 */
	insertTextRules?: CompletionItemInsertTextRule;
	/**
	 * A range of text that should be replaced by this completion item.
	 *
	 * Defaults to a range from the start of the {@link TextDocument.getWordRangeAtPosition current word} to the
	 * current position.
	 *
	 * *Note:* The range must be a {@link Range.isSingleLine single line} and it must
	 * {@link Range.contains contain} the position at which completion has been {@link CompletionItemProvider.provideCompletionItems requested}.
	 */
	range: IRange | CompletionItemRanges;
	/**
	 * An optional set of characters that when pressed while this completion is active will accept it first and
	 * then type that character. *Note* that all commit characters should have `length=1` and that superfluous
	 * characters will be ignored.
	 */
	commitCharacters?: string[];
	/**
	 * An optional array of additional text edits that are applied when
	 * selecting this completion. Edits must not overlap with the main edit
	 * nor with themselves.
	 */
	additionalTextEdits?: ISingleEditOperation[];
	/**
	 * A command that should be run upon acceptance of this item.
	 */
	command?: Command;
	/**
	 * @internal
	 */
	extensionId?: ExtensionIdentifier;

	/**
	 * @internal
	 */
	_id?: [number, number];
}

export interface CompletionList {
	suggestions: CompletionItem[];
	incomplete?: boolean;
	dispose?(): void;

	/**
	 * @internal
	 */
	duration?: number;
}

/**
 * How a suggest provider was triggered.
 */
export const enum CompletionTriggerKind {
	Invoke = 0,
	TriggerCharacter = 1,
	TriggerForIncompleteCompletions = 2
}
/**
 * Contains additional information about the context in which
 * {@link CompletionItemProvider.provideCompletionItems completion provider} is triggered.
 */
export interface CompletionContext {
	/**
	 * How the completion was triggered.
	 */
	triggerKind: CompletionTriggerKind;
	/**
	 * Character that triggered the completion item provider.
	 *
	 * `undefined` if provider was not triggered by a character.
	 */
	triggerCharacter?: string;
}
/**
 * The completion item provider interface defines the contract between extensions and
 * the [IntelliSense](https://code.visualstudio.com/docs/editor/intellisense).
 *
 * When computing *complete* completion items is expensive, providers can optionally implement
 * the `resolveCompletionItem`-function. In that case it is enough to return completion
 * items with a {@link CompletionItem.label label} from the
 * {@link CompletionItemProvider.provideCompletionItems provideCompletionItems}-function. Subsequently,
 * when a completion item is shown in the UI and gains focus this provider is asked to resolve
 * the item, like adding {@link CompletionItem.documentation doc-comment} or {@link CompletionItem.detail details}.
 */
export interface CompletionItemProvider {

	/**
	 * @internal
	 */
	_debugDisplayName?: string;

	triggerCharacters?: string[];
	/**
	 * Provide completion items for the given position and document.
	 */
	provideCompletionItems(model: model.ITextModel, position: Position, context: CompletionContext, token: CancellationToken): ProviderResult<CompletionList>;

	/**
	 * Given a completion item fill in more data, like {@link CompletionItem.documentation doc-comment}
	 * or {@link CompletionItem.detail details}.
	 *
	 * The editor will only resolve a completion item once.
	 */
	resolveCompletionItem?(item: CompletionItem, token: CancellationToken): ProviderResult<CompletionItem>;
}

/**
 * How an {@link InlineCompletionsProvider inline completion provider} was triggered.
 */
export enum InlineCompletionTriggerKind {
	/**
	 * Completion was triggered automatically while editing.
	 * It is sufficient to return a single completion item in this case.
	 */
	Automatic = 0,

	/**
	 * Completion was triggered explicitly by a user gesture.
	 * Return multiple completion items to enable cycling through them.
	 */
	Explicit = 1,
}

export interface InlineCompletionContext {

	/**
	 * How the completion was triggered.
	 */
	readonly triggerKind: InlineCompletionTriggerKind;
	readonly selectedSuggestionInfo: SelectedSuggestionInfo | undefined;
}

export class SelectedSuggestionInfo {
	constructor(
		public readonly range: IRange,
		public readonly text: string,
		public readonly completionKind: CompletionItemKind,
		public readonly isSnippetText: boolean,
	) {
	}

	public equals(other: SelectedSuggestionInfo) {
		return Range.lift(this.range).equalsRange(other.range)
			&& this.text === other.text
			&& this.completionKind === other.completionKind
			&& this.isSnippetText === other.isSnippetText;
	}
}

export interface InlineCompletion {
	/**
	 * The text to insert.
	 * If the text contains a line break, the range must end at the end of a line.
	 * If existing text should be replaced, the existing text must be a prefix of the text to insert.
	 *
	 * The text can also be a snippet. In that case, a preview with default parameters is shown.
	 * When accepting the suggestion, the full snippet is inserted.
	*/
	readonly insertText: string | { snippet: string };

	/**
	 * A text that is used to decide if this inline completion should be shown.
	 * An inline completion is shown if the text to replace is a subword of the filter text.
	 */
	readonly filterText?: string;

	/**
	 * An optional array of additional text edits that are applied when
	 * selecting this completion. Edits must not overlap with the main edit
	 * nor with themselves.
	 */
	readonly additionalTextEdits?: ISingleEditOperation[];

	/**
	 * The range to replace.
	 * Must begin and end on the same line.
	*/
	readonly range?: IRange;

	readonly command?: Command;

	/**
	 * If set to `true`, unopened closing brackets are removed and unclosed opening brackets are closed.
	 * Defaults to `false`.
	*/
	readonly completeBracketPairs?: boolean;
}

export interface InlineCompletions<TItem extends InlineCompletion = InlineCompletion> {
	readonly items: readonly TItem[];
	/**
	 * A list of commands associated with the inline completions of this list.
	 */
	readonly commands?: Command[];

	readonly suppressSuggestions?: boolean | undefined;

	/**
	 * When set and the user types a suggestion without derivating from it, the inline suggestion is not updated.
	 */
	readonly enableForwardStability?: boolean | undefined;
}

export interface InlineCompletionsProvider<T extends InlineCompletions = InlineCompletions> {
	provideInlineCompletions(model: model.ITextModel, position: Position, context: InlineCompletionContext, token: CancellationToken): ProviderResult<T>;

	/**
	 * Will be called when an item is shown.
	 * @param updatedInsertText Is useful to understand bracket completion.
	*/
	handleItemDidShow?(completions: T, item: T['items'][number], updatedInsertText: string): void;

	/**
	 * Will be called when an item is partially accepted.
	 */
	handlePartialAccept?(completions: T, item: T['items'][number], acceptedCharacters: number): void;

	/**
	 * Will be called when a completions list is no longer in use and can be garbage-collected.
	*/
	freeInlineCompletions(completions: T): void;
}

export interface CodeAction {
	title: string;
	command?: Command;
	edit?: WorkspaceEdit;
	diagnostics?: IMarkerData[];
	kind?: string;
	isPreferred?: boolean;
	disabled?: string;
}

export const enum CodeActionTriggerType {
	Invoke = 1,
	Auto = 2,
}

/**
 * @internal
 */
export interface CodeActionContext {
	only?: string;
	trigger: CodeActionTriggerType;
}

export interface CodeActionList extends IDisposable {
	readonly actions: ReadonlyArray<CodeAction>;
}

/**
 * The code action interface defines the contract between extensions and
 * the [light bulb](https://code.visualstudio.com/docs/editor/editingevolved#_code-action) feature.
 * @internal
 */
export interface CodeActionProvider {

	displayName?: string;

	/**
	 * Provide commands for the given document and range.
	 */
	provideCodeActions(model: model.ITextModel, range: Range | Selection, context: CodeActionContext, token: CancellationToken): ProviderResult<CodeActionList>;

	/**
	 * Given a code action fill in the edit. Will only invoked when missing.
	 */
	resolveCodeAction?(codeAction: CodeAction, token: CancellationToken): ProviderResult<CodeAction>;

	/**
	 * Optional list of CodeActionKinds that this provider returns.
	 */
	readonly providedCodeActionKinds?: ReadonlyArray<string>;

	readonly documentation?: ReadonlyArray<{ readonly kind: string; readonly command: Command }>;

	/**
	 * @internal
	 */
	_getAdditionalMenuItems?(context: CodeActionContext, actions: readonly CodeAction[]): Command[];
}

/**
 * @internal
 */
export interface DocumentPasteEdit {
	readonly id: string;
	readonly label: string;
	readonly detail: string;
	readonly priority: number;
	insertText: string | { readonly snippet: string };
	additionalEdit?: WorkspaceEdit;
}

/**
 * @internal
 */
export interface DocumentPasteEditProvider {

	readonly id?: string;

	readonly copyMimeTypes?: readonly string[];
	readonly pasteMimeTypes?: readonly string[];

	prepareDocumentPaste?(model: model.ITextModel, ranges: readonly IRange[], dataTransfer: IReadonlyVSDataTransfer, token: CancellationToken): Promise<undefined | IReadonlyVSDataTransfer>;

	provideDocumentPasteEdits?(model: model.ITextModel, ranges: readonly IRange[], dataTransfer: IReadonlyVSDataTransfer, token: CancellationToken): Promise<DocumentPasteEdit | undefined>;
}

/**
 * Represents a parameter of a callable-signature. A parameter can
 * have a label and a doc-comment.
 */
export interface ParameterInformation {
	/**
	 * The label of this signature. Will be shown in
	 * the UI.
	 */
	label: string | [number, number];
	/**
	 * The human-readable doc-comment of this signature. Will be shown
	 * in the UI but can be omitted.
	 */
	documentation?: string | IMarkdownString;
}
/**
 * Represents the signature of something callable. A signature
 * can have a label, like a function-name, a doc-comment, and
 * a set of parameters.
 */
export interface SignatureInformation {
	/**
	 * The label of this signature. Will be shown in
	 * the UI.
	 */
	label: string;
	/**
	 * The human-readable doc-comment of this signature. Will be shown
	 * in the UI but can be omitted.
	 */
	documentation?: string | IMarkdownString;
	/**
	 * The parameters of this signature.
	 */
	parameters: ParameterInformation[];
	/**
	 * Index of the active parameter.
	 *
	 * If provided, this is used in place of `SignatureHelp.activeSignature`.
	 */
	activeParameter?: number;
}
/**
 * Signature help represents the signature of something
 * callable. There can be multiple signatures but only one
 * active and only one active parameter.
 */
export interface SignatureHelp {
	/**
	 * One or more signatures.
	 */
	signatures: SignatureInformation[];
	/**
	 * The active signature.
	 */
	activeSignature: number;
	/**
	 * The active parameter of the active signature.
	 */
	activeParameter: number;
}

export interface SignatureHelpResult extends IDisposable {
	value: SignatureHelp;
}

export enum SignatureHelpTriggerKind {
	Invoke = 1,
	TriggerCharacter = 2,
	ContentChange = 3,
}

export interface SignatureHelpContext {
	readonly triggerKind: SignatureHelpTriggerKind;
	readonly triggerCharacter?: string;
	readonly isRetrigger: boolean;
	readonly activeSignatureHelp?: SignatureHelp;
}

/**
 * The signature help provider interface defines the contract between extensions and
 * the [parameter hints](https://code.visualstudio.com/docs/editor/intellisense)-feature.
 */
export interface SignatureHelpProvider {

	readonly signatureHelpTriggerCharacters?: ReadonlyArray<string>;
	readonly signatureHelpRetriggerCharacters?: ReadonlyArray<string>;

	/**
	 * Provide help for the signature at the given position and document.
	 */
	provideSignatureHelp(model: model.ITextModel, position: Position, token: CancellationToken, context: SignatureHelpContext): ProviderResult<SignatureHelpResult>;
}

/**
 * A document highlight kind.
 */
export enum DocumentHighlightKind {
	/**
	 * A textual occurrence.
	 */
	Text,
	/**
	 * Read-access of a symbol, like reading a variable.
	 */
	Read,
	/**
	 * Write-access of a symbol, like writing to a variable.
	 */
	Write
}
/**
 * A document highlight is a range inside a text document which deserves
 * special attention. Usually a document highlight is visualized by changing
 * the background color of its range.
 */
export interface DocumentHighlight {
	/**
	 * The range this highlight applies to.
	 */
	range: IRange;
	/**
	 * The highlight kind, default is {@link DocumentHighlightKind.Text text}.
	 */
	kind?: DocumentHighlightKind;
}
/**
 * The document highlight provider interface defines the contract between extensions and
 * the word-highlight-feature.
 */
export interface DocumentHighlightProvider {
	/**
	 * Provide a set of document highlights, like all occurrences of a variable or
	 * all exit-points of a function.
	 */
	provideDocumentHighlights(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<DocumentHighlight[]>;
}

/**
 * The linked editing range provider interface defines the contract between extensions and
 * the linked editing feature.
 */
export interface LinkedEditingRangeProvider {

	/**
	 * Provide a list of ranges that can be edited together.
	 */
	provideLinkedEditingRanges(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<LinkedEditingRanges>;
}

/**
 * Represents a list of ranges that can be edited together along with a word pattern to describe valid contents.
 */
export interface LinkedEditingRanges {
	/**
	 * A list of ranges that can be edited together. The ranges must have
	 * identical length and text content. The ranges cannot overlap
	 */
	ranges: IRange[];

	/**
	 * An optional word pattern that describes valid contents for the given ranges.
	 * If no pattern is provided, the language configuration's word pattern will be used.
	 */
	wordPattern?: RegExp;
}

/**
 * Value-object that contains additional information when
 * requesting references.
 */
export interface ReferenceContext {
	/**
	 * Include the declaration of the current symbol.
	 */
	includeDeclaration: boolean;
}
/**
 * The reference provider interface defines the contract between extensions and
 * the [find references](https://code.visualstudio.com/docs/editor/editingevolved#_peek)-feature.
 */
export interface ReferenceProvider {
	/**
	 * Provide a set of project-wide references for the given position and document.
	 */
	provideReferences(model: model.ITextModel, position: Position, context: ReferenceContext, token: CancellationToken): ProviderResult<Location[]>;
}

/**
 * Represents a location inside a resource, such as a line
 * inside a text file.
 */
export interface Location {
	/**
	 * The resource identifier of this location.
	 */
	uri: URI;
	/**
	 * The document range of this locations.
	 */
	range: IRange;
}

export interface LocationLink {
	/**
	 * A range to select where this link originates from.
	 */
	originSelectionRange?: IRange;

	/**
	 * The target uri this link points to.
	 */
	uri: URI;

	/**
	 * The full range this link points to.
	 */
	range: IRange;

	/**
	 * A range to select this link points to. Must be contained
	 * in `LocationLink.range`.
	 */
	targetSelectionRange?: IRange;
}

/**
 * @internal
 */
export function isLocationLink(thing: any): thing is LocationLink {
	return thing
		&& URI.isUri((thing as LocationLink).uri)
		&& Range.isIRange((thing as LocationLink).range)
		&& (Range.isIRange((thing as LocationLink).originSelectionRange) || Range.isIRange((thing as LocationLink).targetSelectionRange));
}

export type Definition = Location | Location[] | LocationLink[];

/**
 * The definition provider interface defines the contract between extensions and
 * the [go to definition](https://code.visualstudio.com/docs/editor/editingevolved#_go-to-definition)
 * and peek definition features.
 */
export interface DefinitionProvider {
	/**
	 * Provide the definition of the symbol at the given position and document.
	 */
	provideDefinition(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<Definition | LocationLink[]>;
}

/**
 * The definition provider interface defines the contract between extensions and
 * the [go to definition](https://code.visualstudio.com/docs/editor/editingevolved#_go-to-definition)
 * and peek definition features.
 */
export interface DeclarationProvider {
	/**
	 * Provide the declaration of the symbol at the given position and document.
	 */
	provideDeclaration(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<Definition | LocationLink[]>;
}

/**
 * The implementation provider interface defines the contract between extensions and
 * the go to implementation feature.
 */
export interface ImplementationProvider {
	/**
	 * Provide the implementation of the symbol at the given position and document.
	 */
	provideImplementation(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<Definition | LocationLink[]>;
}

/**
 * The type definition provider interface defines the contract between extensions and
 * the go to type definition feature.
 */
export interface TypeDefinitionProvider {
	/**
	 * Provide the type definition of the symbol at the given position and document.
	 */
	provideTypeDefinition(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<Definition | LocationLink[]>;
}

/**
 * A symbol kind.
 */
export const enum SymbolKind {
	File = 0,
	Module = 1,
	Namespace = 2,
	Package = 3,
	Class = 4,
	Method = 5,
	Property = 6,
	Field = 7,
	Constructor = 8,
	Enum = 9,
	Interface = 10,
	Function = 11,
	Variable = 12,
	Constant = 13,
	String = 14,
	Number = 15,
	Boolean = 16,
	Array = 17,
	Object = 18,
	Key = 19,
	Null = 20,
	EnumMember = 21,
	Struct = 22,
	Event = 23,
	Operator = 24,
	TypeParameter = 25
}

export const enum SymbolTag {
	Deprecated = 1,
}

/**
 * @internal
 */
export namespace SymbolKinds {

	const byKind = new Map<SymbolKind, ThemeIcon>();
	byKind.set(SymbolKind.File, Codicon.symbolFile);
	byKind.set(SymbolKind.Module, Codicon.symbolModule);
	byKind.set(SymbolKind.Namespace, Codicon.symbolNamespace);
	byKind.set(SymbolKind.Package, Codicon.symbolPackage);
	byKind.set(SymbolKind.Class, Codicon.symbolClass);
	byKind.set(SymbolKind.Method, Codicon.symbolMethod);
	byKind.set(SymbolKind.Property, Codicon.symbolProperty);
	byKind.set(SymbolKind.Field, Codicon.symbolField);
	byKind.set(SymbolKind.Constructor, Codicon.symbolConstructor);
	byKind.set(SymbolKind.Enum, Codicon.symbolEnum);
	byKind.set(SymbolKind.Interface, Codicon.symbolInterface);
	byKind.set(SymbolKind.Function, Codicon.symbolFunction);
	byKind.set(SymbolKind.Variable, Codicon.symbolVariable);
	byKind.set(SymbolKind.Constant, Codicon.symbolConstant);
	byKind.set(SymbolKind.String, Codicon.symbolString);
	byKind.set(SymbolKind.Number, Codicon.symbolNumber);
	byKind.set(SymbolKind.Boolean, Codicon.symbolBoolean);
	byKind.set(SymbolKind.Array, Codicon.symbolArray);
	byKind.set(SymbolKind.Object, Codicon.symbolObject);
	byKind.set(SymbolKind.Key, Codicon.symbolKey);
	byKind.set(SymbolKind.Null, Codicon.symbolNull);
	byKind.set(SymbolKind.EnumMember, Codicon.symbolEnumMember);
	byKind.set(SymbolKind.Struct, Codicon.symbolStruct);
	byKind.set(SymbolKind.Event, Codicon.symbolEvent);
	byKind.set(SymbolKind.Operator, Codicon.symbolOperator);
	byKind.set(SymbolKind.TypeParameter, Codicon.symbolTypeParameter);
	/**
	 * @internal
	 */
	export function toIcon(kind: SymbolKind): ThemeIcon {
		let icon = byKind.get(kind);
		if (!icon) {
			console.info('No codicon found for SymbolKind ' + kind);
			icon = Codicon.symbolProperty;
		}
		return icon;
	}
}

export interface DocumentSymbol {
	name: string;
	detail: string;
	kind: SymbolKind;
	tags: ReadonlyArray<SymbolTag>;
	containerName?: string;
	range: IRange;
	selectionRange: IRange;
	children?: DocumentSymbol[];
}

/**
 * The document symbol provider interface defines the contract between extensions and
 * the [go to symbol](https://code.visualstudio.com/docs/editor/editingevolved#_go-to-symbol)-feature.
 */
export interface DocumentSymbolProvider {

	displayName?: string;

	/**
	 * Provide symbol information for the given document.
	 */
	provideDocumentSymbols(model: model.ITextModel, token: CancellationToken): ProviderResult<DocumentSymbol[]>;
}

export interface TextEdit {
	range: IRange;
	text: string;
	eol?: model.EndOfLineSequence;
}

/**
 * Interface used to format a model
 */
export interface FormattingOptions {
	/**
	 * Size of a tab in spaces.
	 */
	tabSize: number;
	/**
	 * Prefer spaces over tabs.
	 */
	insertSpaces: boolean;
	/**
	 * The list of multiple ranges to format at once, if the provider supports it.
	 */
	ranges?: Range[];
}
/**
 * The document formatting provider interface defines the contract between extensions and
 * the formatting-feature.
 */
export interface DocumentFormattingEditProvider {

	/**
	 * @internal
	 */
	readonly extensionId?: ExtensionIdentifier;

	readonly displayName?: string;

	/**
	 * Provide formatting edits for a whole document.
	 */
	provideDocumentFormattingEdits(model: model.ITextModel, options: FormattingOptions, token: CancellationToken): ProviderResult<TextEdit[]>;
}
/**
 * The document formatting provider interface defines the contract between extensions and
 * the formatting-feature.
 */
export interface DocumentRangeFormattingEditProvider {
	/**
	 * @internal
	 */
	readonly extensionId?: ExtensionIdentifier;

	readonly displayName?: string;

	/**
	 * Provide formatting edits for a range in a document.
	 *
	 * The given range is a hint and providers can decide to format a smaller
	 * or larger range. Often this is done by adjusting the start and end
	 * of the range to full syntax nodes.
	 */
	provideDocumentRangeFormattingEdits(model: model.ITextModel, range: Range, options: FormattingOptions, token: CancellationToken): ProviderResult<TextEdit[]>;

	provideDocumentRangesFormattingEdits?(model: model.ITextModel, ranges: Range[], options: FormattingOptions, token: CancellationToken): ProviderResult<TextEdit[]>;
}
/**
 * The document formatting provider interface defines the contract between extensions and
 * the formatting-feature.
 */
export interface OnTypeFormattingEditProvider {


	/**
	 * @internal
	 */
	readonly extensionId?: ExtensionIdentifier;

	autoFormatTriggerCharacters: string[];

	/**
	 * Provide formatting edits after a character has been typed.
	 *
	 * The given position and character should hint to the provider
	 * what range the position to expand to, like find the matching `{`
	 * when `}` has been entered.
	 */
	provideOnTypeFormattingEdits(model: model.ITextModel, position: Position, ch: string, options: FormattingOptions, token: CancellationToken): ProviderResult<TextEdit[]>;
}

/**
 * @internal
 */
export interface IInplaceReplaceSupportResult {
	value: string;
	range: IRange;
}

/**
 * A link inside the editor.
 */
export interface ILink {
	range: IRange;
	url?: URI | string;
	tooltip?: string;
}

export interface ILinksList {
	links: ILink[];
	dispose?(): void;
}
/**
 * A provider of links.
 */
export interface LinkProvider {
	provideLinks(model: model.ITextModel, token: CancellationToken): ProviderResult<ILinksList>;
	resolveLink?: (link: ILink, token: CancellationToken) => ProviderResult<ILink>;
}

/**
 * A color in RGBA format.
 */
export interface IColor {

	/**
	 * The red component in the range [0-1].
	 */
	readonly red: number;

	/**
	 * The green component in the range [0-1].
	 */
	readonly green: number;

	/**
	 * The blue component in the range [0-1].
	 */
	readonly blue: number;

	/**
	 * The alpha component in the range [0-1].
	 */
	readonly alpha: number;
}

/**
 * String representations for a color
 */
export interface IColorPresentation {
	/**
	 * The label of this color presentation. It will be shown on the color
	 * picker header. By default this is also the text that is inserted when selecting
	 * this color presentation.
	 */
	label: string;
	/**
	 * An {@link TextEdit edit} which is applied to a document when selecting
	 * this presentation for the color.
	 */
	textEdit?: TextEdit;
	/**
	 * An optional array of additional {@link TextEdit text edits} that are applied when
	 * selecting this color presentation.
	 */
	additionalTextEdits?: TextEdit[];
}

/**
 * A color range is a range in a text model which represents a color.
 */
export interface IColorInformation {

	/**
	 * The range within the model.
	 */
	range: IRange;

	/**
	 * The color represented in this range.
	 */
	color: IColor;
}

/**
 * A provider of colors for editor models.
 */
export interface DocumentColorProvider {
	/**
	 * Provides the color ranges for a specific model.
	 */
	provideDocumentColors(model: model.ITextModel, token: CancellationToken): ProviderResult<IColorInformation[]>;
	/**
	 * Provide the string representations for a color.
	 */
	provideColorPresentations(model: model.ITextModel, colorInfo: IColorInformation, token: CancellationToken): ProviderResult<IColorPresentation[]>;
}

export interface SelectionRange {
	range: IRange;
}

export interface SelectionRangeProvider {
	/**
	 * Provide ranges that should be selected from the given position.
	 */
	provideSelectionRanges(model: model.ITextModel, positions: Position[], token: CancellationToken): ProviderResult<SelectionRange[][]>;
}

export interface FoldingContext {
}
/**
 * A provider of folding ranges for editor models.
 */
export interface FoldingRangeProvider {

	/**
	 * @internal
	 */
	readonly id?: string;

	/**
	 * An optional event to signal that the folding ranges from this provider have changed.
	 */
	onDidChange?: Event<this>;

	/**
	 * Provides the folding ranges for a specific model.
	 */
	provideFoldingRanges(model: model.ITextModel, context: FoldingContext, token: CancellationToken): ProviderResult<FoldingRange[]>;
}

export interface FoldingRange {

	/**
	 * The one-based start line of the range to fold. The folded area starts after the line's last character.
	 */
	start: number;

	/**
	 * The one-based end line of the range to fold. The folded area ends with the line's last character.
	 */
	end: number;

	/**
	 * Describes the {@link FoldingRangeKind Kind} of the folding range such as {@link FoldingRangeKind.Comment Comment} or
	 * {@link FoldingRangeKind.Region Region}. The kind is used to categorize folding ranges and used by commands
	 * like 'Fold all comments'. See
	 * {@link FoldingRangeKind} for an enumeration of standardized kinds.
	 */
	kind?: FoldingRangeKind;
}
export class FoldingRangeKind {
	/**
	 * Kind for folding range representing a comment. The value of the kind is 'comment'.
	 */
	static readonly Comment = new FoldingRangeKind('comment');
	/**
	 * Kind for folding range representing a import. The value of the kind is 'imports'.
	 */
	static readonly Imports = new FoldingRangeKind('imports');
	/**
	 * Kind for folding range representing regions (for example marked by `#region`, `#endregion`).
	 * The value of the kind is 'region'.
	 */
	static readonly Region = new FoldingRangeKind('region');

	/**
	 * Returns a {@link FoldingRangeKind} for the given value.
	 *
	 * @param value of the kind.
	 */
	static fromValue(value: string) {
		switch (value) {
			case 'comment': return FoldingRangeKind.Comment;
			case 'imports': return FoldingRangeKind.Imports;
			case 'region': return FoldingRangeKind.Region;
		}
		return new FoldingRangeKind(value);
	}

	/**
	 * Creates a new {@link FoldingRangeKind}.
	 *
	 * @param value of the kind.
	 */
	public constructor(public value: string) {
	}
}


export interface WorkspaceEditMetadata {
	needsConfirmation: boolean;
	label: string;
	description?: string;
	/**
	 * @internal
	 */
	iconPath?: ThemeIcon | URI | { light: URI; dark: URI };
}

export interface WorkspaceFileEditOptions {
	overwrite?: boolean;
	ignoreIfNotExists?: boolean;
	ignoreIfExists?: boolean;
	recursive?: boolean;
	copy?: boolean;
	folder?: boolean;
	skipTrashBin?: boolean;
	maxSize?: number;

	/**
	 * @internal
	 */
	contents?: Promise<VSBuffer>;
}

export interface IWorkspaceFileEdit {
	oldResource?: URI;
	newResource?: URI;
	options?: WorkspaceFileEditOptions;
	metadata?: WorkspaceEditMetadata;
}

export interface IWorkspaceTextEdit {
	resource: URI;
	textEdit: TextEdit & { insertAsSnippet?: boolean };
	versionId: number | undefined;
	metadata?: WorkspaceEditMetadata;
}

export interface WorkspaceEdit {
	edits: Array<IWorkspaceTextEdit | IWorkspaceFileEdit>;
}

export interface Rejection {
	rejectReason?: string;
}
export interface RenameLocation {
	range: IRange;
	text: string;
}

export interface RenameProvider {
	provideRenameEdits(model: model.ITextModel, position: Position, newName: string, token: CancellationToken): ProviderResult<WorkspaceEdit & Rejection>;
	resolveRenameLocation?(model: model.ITextModel, position: Position, token: CancellationToken): ProviderResult<RenameLocation & Rejection>;
}

export interface Command {
	id: string;
	title: string;
	tooltip?: string;
	arguments?: any[];
}

/**
 * @internal
 */
export namespace Command {

	/**
	 * @internal
	 */
	export function is(obj: any): obj is Command {
		if (!obj || typeof obj !== 'object') {
			return false;
		}
		return typeof (<Command>obj).id === 'string' &&
			typeof (<Command>obj).title === 'string';
	}
}

/**
 * @internal
 */
export interface CommentThreadTemplate {
	controllerHandle: number;
	label: string;
	acceptInputCommand?: Command;
	additionalCommands?: Command[];
	deleteCommand?: Command;
}

/**
 * @internal
 */
export interface CommentInfo {
	extensionId?: string;
	threads: CommentThread[];
	commentingRanges: CommentingRanges;
}

/**
 * @internal
 */
export enum CommentThreadCollapsibleState {
	/**
	 * Determines an item is collapsed
	 */
	Collapsed = 0,
	/**
	 * Determines an item is expanded
	 */
	Expanded = 1
}

/**
 * @internal
 */
export enum CommentThreadState {
	Unresolved = 0,
	Resolved = 1
}

/**
 * @internal
 */
export interface CommentWidget {
	commentThread: CommentThread;
	comment?: Comment;
	input: string;
	onDidChangeInput: Event<string>;
}

/**
 * @internal
 */
export interface CommentInput {
	value: string;
	uri: URI;
}

/**
 * @internal
 */
export interface CommentThread<T = IRange> {
	isDocumentCommentThread(): this is CommentThread<IRange>;
	commentThreadHandle: number;
	controllerHandle: number;
	extensionId?: string;
	threadId: string;
	resource: string | null;
	range: T | undefined;
	label: string | undefined;
	contextValue: string | undefined;
	comments: Comment[] | undefined;
	onDidChangeComments: Event<readonly Comment[] | undefined>;
	collapsibleState?: CommentThreadCollapsibleState;
	initialCollapsibleState?: CommentThreadCollapsibleState;
	onDidChangeInitialCollapsibleState: Event<CommentThreadCollapsibleState | undefined>;
	state?: CommentThreadState;
	canReply: boolean;
	input?: CommentInput;
	onDidChangeInput: Event<CommentInput | undefined>;
	onDidChangeRange: Event<T | undefined>;
	onDidChangeLabel: Event<string | undefined>;
	onDidChangeCollapsibleState: Event<CommentThreadCollapsibleState | undefined>;
	onDidChangeState: Event<CommentThreadState | undefined>;
	onDidChangeCanReply: Event<boolean>;
	isDisposed: boolean;
	isTemplate: boolean;
}

/**
 * @internal
 */

export interface CommentingRanges {
	readonly resource: URI;
	ranges: IRange[];
	fileComments: boolean;
}

/**
 * @internal
 */
export interface CommentReaction {
	readonly label?: string;
	readonly iconPath?: UriComponents;
	readonly count?: number;
	readonly hasReacted?: boolean;
	readonly canEdit?: boolean;
}

/**
 * @internal
 */
export interface CommentOptions {
	/**
	 * An optional string to show on the comment input box when it's collapsed.
	 */
	prompt?: string;

	/**
	 * An optional string to show as placeholder in the comment input box when it's focused.
	 */
	placeHolder?: string;
}

/**
 * @internal
 */
export enum CommentMode {
	Editing = 0,
	Preview = 1
}

/**
 * @internal
 */
export enum CommentState {
	Published = 0,
	Draft = 1
}

/**
 * @internal
 */
export interface Comment {
	readonly uniqueIdInThread: number;
	readonly body: string | IMarkdownString;
	readonly userName: string;
	readonly userIconPath?: UriComponents;
	readonly contextValue?: string;
	readonly commentReactions?: CommentReaction[];
	readonly label?: string;
	readonly mode?: CommentMode;
	readonly timestamp?: string;
}

/**
 * @internal
 */
export interface CommentThreadChangedEvent<T> {
	/**
	 * Added comment threads.
	 */
	readonly added: CommentThread<T>[];

	/**
	 * Removed comment threads.
	 */
	readonly removed: CommentThread<T>[];

	/**
	 * Changed comment threads.
	 */
	readonly changed: CommentThread<T>[];
}

export interface CodeLens {
	range: IRange;
	id?: string;
	command?: Command;
}

export interface CodeLensList {
	lenses: CodeLens[];
	dispose(): void;
}

export interface CodeLensProvider {
	onDidChange?: Event<this>;
	provideCodeLenses(model: model.ITextModel, token: CancellationToken): ProviderResult<CodeLensList>;
	resolveCodeLens?(model: model.ITextModel, codeLens: CodeLens, token: CancellationToken): ProviderResult<CodeLens>;
}


export enum InlayHintKind {
	Type = 1,
	Parameter = 2,
}

export interface InlayHintLabelPart {
	label: string;
	tooltip?: string | IMarkdownString;
	// collapsible?: boolean;
	command?: Command;
	location?: Location;
}

export interface InlayHint {
	label: string | InlayHintLabelPart[];
	tooltip?: string | IMarkdownString;
	textEdits?: TextEdit[];
	position: IPosition;
	kind?: InlayHintKind;
	paddingLeft?: boolean;
	paddingRight?: boolean;
}

export interface InlayHintList {
	hints: InlayHint[];
	dispose(): void;
}

export interface InlayHintsProvider {
	displayName?: string;
	onDidChangeInlayHints?: Event<void>;
	provideInlayHints(model: model.ITextModel, range: Range, token: CancellationToken): ProviderResult<InlayHintList>;
	resolveInlayHint?(hint: InlayHint, token: CancellationToken): ProviderResult<InlayHint>;
}

export interface SemanticTokensLegend {
	readonly tokenTypes: string[];
	readonly tokenModifiers: string[];
}

export interface SemanticTokens {
	readonly resultId?: string;
	readonly data: Uint32Array;
}

export interface SemanticTokensEdit {
	readonly start: number;
	readonly deleteCount: number;
	readonly data?: Uint32Array;
}

export interface SemanticTokensEdits {
	readonly resultId?: string;
	readonly edits: SemanticTokensEdit[];
}

export interface DocumentSemanticTokensProvider {
	onDidChange?: Event<void>;
	getLegend(): SemanticTokensLegend;
	provideDocumentSemanticTokens(model: model.ITextModel, lastResultId: string | null, token: CancellationToken): ProviderResult<SemanticTokens | SemanticTokensEdits>;
	releaseDocumentSemanticTokens(resultId: string | undefined): void;
}

export interface DocumentRangeSemanticTokensProvider {
	getLegend(): SemanticTokensLegend;
	provideDocumentRangeSemanticTokens(model: model.ITextModel, range: Range, token: CancellationToken): ProviderResult<SemanticTokens>;
}

/**
 * @internal
 */
export interface ITokenizationSupportChangedEvent {
	changedLanguages: string[];
	changedColorMap: boolean;
}

/**
 * @internal
 */
export interface ILazyTokenizationSupport {
	get tokenizationSupport(): Promise<ITokenizationSupport | null>;
}

/**
 * @internal
 */
export class LazyTokenizationSupport implements IDisposable, ILazyTokenizationSupport {
	private _tokenizationSupport: Promise<ITokenizationSupport & IDisposable | null> | null = null;

	constructor(private readonly createSupport: () => Promise<ITokenizationSupport & IDisposable | null>) {
	}

	dispose(): void {
		if (this._tokenizationSupport) {
			this._tokenizationSupport.then((support) => {
				if (support) {
					support.dispose();
				}
			});
		}
	}

	get tokenizationSupport(): Promise<ITokenizationSupport | null> {
		if (!this._tokenizationSupport) {
			this._tokenizationSupport = this.createSupport();
		}
		return this._tokenizationSupport;
	}
}

/**
 * @internal
 */
export interface ITokenizationRegistry {

	/**
	 * An event triggered when:
	 *  - a tokenization support is registered, unregistered or changed.
	 *  - the color map is changed.
	 */
	onDidChange: Event<ITokenizationSupportChangedEvent>;

	/**
	 * Fire a change event for a language.
	 * This is useful for languages that embed other languages.
	 */
	handleChange(languageIds: string[]): void;

	/**
	 * Register a tokenization support.
	 */
	register(languageId: string, support: ITokenizationSupport): IDisposable;

	/**
	 * Register a tokenization support factory.
	 */
	registerFactory(languageId: string, factory: ILazyTokenizationSupport): IDisposable;

	/**
	 * Get or create the tokenization support for a language.
	 * Returns `null` if not found.
	 */
	getOrCreate(languageId: string): Promise<ITokenizationSupport | null>;

	/**
	 * Get the tokenization support for a language.
	 * Returns `null` if not found.
	 */
	get(languageId: string): ITokenizationSupport | null;

	/**
	 * Returns false if a factory is still pending.
	 */
	isResolved(languageId: string): boolean;

	/**
	 * Set the new color map that all tokens will use in their ColorId binary encoded bits for foreground and background.
	 */
	setColorMap(colorMap: Color[]): void;

	getColorMap(): Color[] | null;

	getDefaultBackground(): Color | null;
}

/**
 * @internal
 */
export const TokenizationRegistry: ITokenizationRegistry = new TokenizationRegistryImpl();


/**
 * @internal
 */
export enum ExternalUriOpenerPriority {
	None = 0,
	Option = 1,
	Default = 2,
	Preferred = 3,
}

/**
 * @internal
 */
export interface DocumentOnDropEdit {
	readonly id: string;
	readonly label: string;
	readonly priority: number;
	insertText: string | { readonly snippet: string };
	additionalEdit?: WorkspaceEdit;
}

/**
 * @internal
 */
export interface DocumentOnDropEditProvider {
	readonly dropMimeTypes?: readonly string[];

	provideDocumentOnDropEdits(model: model.ITextModel, position: IPosition, dataTransfer: IReadonlyVSDataTransfer, token: CancellationToken): ProviderResult<DocumentOnDropEdit>;
}
