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

// This is the place for API experiments and proposal.

declare module 'vscode' {

	// export enum FileErrorCodes {
	// 	/**
	// 	 * Not owner.
	// 	 */
	// 	EPERM = 1,
	// 	/**
	// 	 * No such file or directory.
	// 	 */
	// 	ENOENT = 2,
	// 	/**
	// 	 * I/O error.
	// 	 */
	// 	EIO = 5,
	// 	/**
	// 	 * Permission denied.
	// 	 */
	// 	EACCES = 13,
	// 	/**
	// 	 * File exists.
	// 	 */
	// 	EEXIST = 17,
	// 	/**
	// 	 * Not a directory.
	// 	 */
	// 	ENOTDIR = 20,
	// 	/**
	// 	 * Is a directory.
	// 	 */
	// 	EISDIR = 21,
	// 	/**
	// 	 *  File too large.
	// 	 */
	// 	EFBIG = 27,
	// 	/**
	// 	 * No space left on device.
	// 	 */
	// 	ENOSPC = 28,
	// 	/**
	// 	 * Directory is not empty.
	// 	 */
	// 	ENOTEMPTY = 66,
	// 	/**
	// 	 * Invalid file handle.
	// 	 */
	// 	ESTALE = 70,
	// 	/**
	// 	 * Illegal NFS file handle.
	// 	 */
	// 	EBADHANDLE = 10001,
	// }

	export enum FileChangeType {
		Updated = 0,
		Added = 1,
		Deleted = 2
	}

	export interface FileChange {
		type: FileChangeType;
		resource: Uri;
	}

	export enum FileType {
		File = 0,
		Dir = 1,
		Symlink = 2
	}

	export interface FileStat {
		id: number | string;
		mtime: number;
		// atime: number;
		size: number;
		type: FileType;
	}

	export interface TextSearchQuery {
		pattern: string;
		isRegex?: boolean;
		isCaseSensitive?: boolean;
		isWordMatch?: boolean;
	}

	export interface TextSearchOptions {
		includes: GlobPattern[];
		excludes: GlobPattern[];
	}

	export interface TextSearchResult {
		uri: Uri;
		range: Range;
		preview: { leading: string, matching: string, trailing: string };
	}

	// todo@joh discover files etc
	// todo@joh CancellationToken everywhere
	// todo@joh add open/close calls?
	export interface FileSystemProvider {

		readonly onDidChange?: Event<FileChange[]>;

		// todo@joh - remove this
		readonly root?: Uri;

		// more...
		//
		utimes(resource: Uri, mtime: number, atime: number): Thenable<FileStat>;

		stat(resource: Uri): Thenable<FileStat>;

		read(resource: Uri, offset: number, length: number, progress: Progress<Uint8Array>): Thenable<number>;

		// todo@joh - have an option to create iff not exist
		// todo@remote
		// offset - byte offset to start
		// count - number of bytes to write
		// Thenable<number> - number of bytes actually written
		write(resource: Uri, content: Uint8Array): Thenable<void>;

		// todo@remote
		// Thenable<FileStat>
		move(resource: Uri, target: Uri): Thenable<FileStat>;

		// todo@remote
		// helps with performance bigly
		// copy?(from: Uri, to: Uri): Thenable<void>;

		// todo@remote
		// Thenable<FileStat>
		mkdir(resource: Uri): Thenable<FileStat>;

		readdir(resource: Uri): Thenable<[Uri, FileStat][]>;

		// todo@remote
		// ? merge both
		// ? recursive del
		rmdir(resource: Uri): Thenable<void>;
		unlink(resource: Uri): Thenable<void>;

		// todo@remote
		// create(resource: Uri): Thenable<FileStat>;

		// find files by names
		// todo@joh, move into its own provider
		findFiles?(query: string, progress: Progress<Uri>, token: CancellationToken): Thenable<void>;
		provideTextSearchResults?(query: TextSearchQuery, options: TextSearchOptions, progress: Progress<TextSearchResult>, token: CancellationToken): Thenable<void>;
	}

	export namespace workspace {
		export function registerFileSystemProvider(scheme: string, provider: FileSystemProvider): Disposable;

		/**
		 * Updates the workspace folders of the currently opened workspace. This method allows to add, remove
		 * and change workspace folders a the same time. Use the [onDidChangeWorkspaceFolders()](#onDidChangeWorkspaceFolders)
		 * event to get notified when the workspace folders have been updated.
		 *
		 * **Example:** adding a new workspace folder at the end of workspace folders
		 * ```typescript
		 * workspace.updateWorkspaceFolders(workspace.workspaceFolders ? workspace.workspaceFolders.length : 0, null, { uri: ...});
		 * ```
		 *
		 * **Example:** removing the first workspace folder
		 * ```typescript
		 * workspace.updateWorkspaceFolders(0, 1);
		 * ```
		 *
		 * **Example:** replacing an existing workspace folder with a new one
		 * ```typescript
		 * workspace.updateWorkspaceFolders(0, 1, { uri: ...});
		 * ```
		 *
		 * It is valid to remove an existing workspace folder and add it again with a different name
		 * to rename that folder.
		 *
		 * Note: if the first workspace folder is added, removed or changed, all extensions will be restarted
		 * so that the (deprecated) `rootPath` property is updated to point to the first workspace
		 * folder.
		 *
		 * Note: it is not valid to call [updateWorkspaceFolders()](#updateWorkspaceFolders) multiple times
		 * without waiting for the [onDidChangeWorkspaceFolders()](#onDidChangeWorkspaceFolders) to fire.
		 *
		 * @param start the zero-based location in the list of currently opened [workspace folders](#WorkspaceFolder)
		 * from which to start deleting workspace folders.
		 * @param deleteCount the optional number of workspace folders to remove.
		 * @param workspaceFoldersToAdd the optional variable set of workspace folders to add in place of the deleted ones.
		 * Each workspace is identified with a mandatory URI and an optional name.
		 * @return true if the operation was successfully started and false otherwise if arguments were used that would result
		 * in invalid workspace folder state (e.g. 2 folders with the same URI).
		 */
		export function updateWorkspaceFolders(start: number, deleteCount: number, ...workspaceFoldersToAdd: { uri: Uri, name?: string }[]): boolean;
	}

	export namespace window {

		export function sampleFunction(): Thenable<any>;
	}

	/**
	 * The contiguous set of modified lines in a diff.
	 */
	export interface LineChange {
		readonly originalStartLineNumber: number;
		readonly originalEndLineNumber: number;
		readonly modifiedStartLineNumber: number;
		readonly modifiedEndLineNumber: number;
	}

	export namespace commands {

		/**
		 * Registers a diff information command that can be invoked via a keyboard shortcut,
		 * a menu item, an action, or directly.
		 *
		 * Diff information commands are different from ordinary [commands](#commands.registerCommand) as
		 * they only execute when there is an active diff editor when the command is called, and the diff
		 * information has been computed. Also, the command handler of an editor command has access to
		 * the diff information.
		 *
		 * @param command A unique identifier for the command.
		 * @param callback A command handler function with access to the [diff information](#LineChange).
		 * @param thisArg The `this` context used when invoking the handler function.
		 * @return Disposable which unregisters this command on disposal.
		 */
		export function registerDiffInformationCommand(command: string, callback: (diff: LineChange[], ...args: any[]) => any, thisArg?: any): Disposable;
	}

	//#region decorations

	//todo@joh -> make class
	export interface DecorationData {
		priority?: number;
		title?: string;
		bubble?: boolean;
		abbreviation?: string;
		color?: ThemeColor;
		source?: string;
	}

	export interface SourceControlResourceDecorations {
		source?: string;
		letter?: string;
		color?: ThemeColor;
	}

	export interface DecorationProvider {
		onDidChangeDecorations: Event<undefined | Uri | Uri[]>;
		provideDecoration(uri: Uri, token: CancellationToken): ProviderResult<DecorationData>;
	}

	export namespace window {
		export function registerDecorationProvider(provider: DecorationProvider): Disposable;
	}

	//#endregion

	export namespace debug {

		/**
		 * List of breakpoints.
		 *
		 * @readonly
		 */
		export let breakpoints: Breakpoint[];

		/**
		 * An event that is emitted when a breakpoint is added, removed, or changed.
		 */
		export const onDidChangeBreakpoints: Event<BreakpointsChangeEvent>;

		/**
		 * Add breakpoints.
		 * @param breakpoints The breakpoints to add.
		*/
		export function addBreakpoints(breakpoints: Breakpoint[]): void;

		/**
		 * Remove breakpoints.
		 * @param breakpoints The breakpoints to remove.
		 */
		export function removeBreakpoints(breakpoints: Breakpoint[]): void;
	}

	/**
	 * An event describing a change to the set of [breakpoints](#debug.Breakpoint).
	 */
	export interface BreakpointsChangeEvent {
		/**
		 * Added breakpoints.
		 */
		readonly added: Breakpoint[];

		/**
		 * Removed breakpoints.
		 */
		readonly removed: Breakpoint[];

		/**
		 * Changed breakpoints.
		 */
		readonly changed: Breakpoint[];
	}

	/**
	 * The base class of all breakpoint types.
	 */
	export class Breakpoint {
		/**
		 * Is breakpoint enabled.
		 */
		readonly enabled: boolean;
		/**
		 * An optional expression for conditional breakpoints.
		 */
		readonly condition?: string;
		/**
		 * An optional expression that controls how many hits of the breakpoint are ignored.
		 */
		readonly hitCondition?: string;

		protected constructor(enabled?: boolean, condition?: string, hitCondition?: string);
	}

	/**
	 * A breakpoint specified by a source location.
	 */
	export class SourceBreakpoint extends Breakpoint {
		/**
		 * The source and line position of this breakpoint.
		 */
		readonly location: Location;

		/**
		 * Create a new breakpoint for a source location.
		 */
		constructor(location: Location, enabled?: boolean, condition?: string, hitCondition?: string);
	}

	/**
	 * A breakpoint specified by a function name.
	 */
	export class FunctionBreakpoint extends Breakpoint {
		/**
		 * The name of the function to which this breakpoint is attached.
		 */
		readonly functionName: string;

		/**
		 * Create a new function breakpoint.
		 */
		constructor(functionName: string, enabled?: boolean, condition?: string, hitCondition?: string);
	}

	/**
	 * The severity level of a log message
	 */
	export enum LogLevel {
		Trace = 1,
		Debug = 2,
		Info = 3,
		Warning = 4,
		Error = 5,
		Critical = 6,
		Off = 7
	}

	/**
	 * A logger for writing to an extension's log file, and accessing its dedicated log directory.
	 */
	export interface Logger {
		readonly onDidChangeLogLevel: Event<LogLevel>;
		readonly currentLevel: LogLevel;
		readonly logDirectory: Thenable<string>;

		trace(message: string, ...args: any[]): void;
		debug(message: string, ...args: any[]): void;
		info(message: string, ...args: any[]): void;
		warn(message: string, ...args: any[]): void;
		error(message: string | Error, ...args: any[]): void;
		critical(message: string | Error, ...args: any[]): void;
	}

	export interface ExtensionContext {
		/**
		 * This extension's logger
		 */
		logger: Logger;
	}

	export interface RenameInitialValue {
		range: Range;
		text?: string;
	}

	export namespace languages {

		export interface RenameProvider2 extends RenameProvider {
			resolveInitialRenameValue?(document: TextDocument, position: Position, token: CancellationToken): ProviderResult<RenameInitialValue>;
		}
	}
}