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

import * as browser from 'vs/base/browser/browser';
import { KeyCode, KeyCodeUtils, KeyMod, SimpleKeybinding } from 'vs/base/common/keyCodes';
import * as platform from 'vs/base/common/platform';

let KEY_CODE_MAP: { [keyCode: number]: KeyCode } = new Array(230);
let INVERSE_KEY_CODE_MAP: KeyCode[] = new Array(KeyCode.MAX_VALUE);

(function () {
	for (let i = 0; i < INVERSE_KEY_CODE_MAP.length; i++) {
		INVERSE_KEY_CODE_MAP[i] = -1;
	}

	function define(code: number, keyCode: KeyCode): void {
		KEY_CODE_MAP[code] = keyCode;
		INVERSE_KEY_CODE_MAP[keyCode] = code;
	}

	define(3, KeyCode.PauseBreak); // VK_CANCEL 0x03 Control-break processing
	define(8, KeyCode.Backspace);
	define(9, KeyCode.Tab);
	define(13, KeyCode.Enter);
	define(16, KeyCode.Shift);
	define(17, KeyCode.Ctrl);
	define(18, KeyCode.Alt);
	define(19, KeyCode.PauseBreak);
	define(20, KeyCode.CapsLock);
	define(27, KeyCode.Escape);
	define(32, KeyCode.Space);
	define(33, KeyCode.PageUp);
	define(34, KeyCode.PageDown);
	define(35, KeyCode.End);
	define(36, KeyCode.Home);
	define(37, KeyCode.LeftArrow);
	define(38, KeyCode.UpArrow);
	define(39, KeyCode.RightArrow);
	define(40, KeyCode.DownArrow);
	define(45, KeyCode.Insert);
	define(46, KeyCode.Delete);

	define(48, KeyCode.KEY_0);
	define(49, KeyCode.KEY_1);
	define(50, KeyCode.KEY_2);
	define(51, KeyCode.KEY_3);
	define(52, KeyCode.KEY_4);
	define(53, KeyCode.KEY_5);
	define(54, KeyCode.KEY_6);
	define(55, KeyCode.KEY_7);
	define(56, KeyCode.KEY_8);
	define(57, KeyCode.KEY_9);

	define(65, KeyCode.KEY_A);
	define(66, KeyCode.KEY_B);
	define(67, KeyCode.KEY_C);
	define(68, KeyCode.KEY_D);
	define(69, KeyCode.KEY_E);
	define(70, KeyCode.KEY_F);
	define(71, KeyCode.KEY_G);
	define(72, KeyCode.KEY_H);
	define(73, KeyCode.KEY_I);
	define(74, KeyCode.KEY_J);
	define(75, KeyCode.KEY_K);
	define(76, KeyCode.KEY_L);
	define(77, KeyCode.KEY_M);
	define(78, KeyCode.KEY_N);
	define(79, KeyCode.KEY_O);
	define(80, KeyCode.KEY_P);
	define(81, KeyCode.KEY_Q);
	define(82, KeyCode.KEY_R);
	define(83, KeyCode.KEY_S);
	define(84, KeyCode.KEY_T);
	define(85, KeyCode.KEY_U);
	define(86, KeyCode.KEY_V);
	define(87, KeyCode.KEY_W);
	define(88, KeyCode.KEY_X);
	define(89, KeyCode.KEY_Y);
	define(90, KeyCode.KEY_Z);

	define(93, KeyCode.ContextMenu);

	define(96, KeyCode.NUMPAD_0);
	define(97, KeyCode.NUMPAD_1);
	define(98, KeyCode.NUMPAD_2);
	define(99, KeyCode.NUMPAD_3);
	define(100, KeyCode.NUMPAD_4);
	define(101, KeyCode.NUMPAD_5);
	define(102, KeyCode.NUMPAD_6);
	define(103, KeyCode.NUMPAD_7);
	define(104, KeyCode.NUMPAD_8);
	define(105, KeyCode.NUMPAD_9);
	define(106, KeyCode.NUMPAD_MULTIPLY);
	define(107, KeyCode.NUMPAD_ADD);
	define(108, KeyCode.NUMPAD_SEPARATOR);
	define(109, KeyCode.NUMPAD_SUBTRACT);
	define(110, KeyCode.NUMPAD_DECIMAL);
	define(111, KeyCode.NUMPAD_DIVIDE);

	define(112, KeyCode.F1);
	define(113, KeyCode.F2);
	define(114, KeyCode.F3);
	define(115, KeyCode.F4);
	define(116, KeyCode.F5);
	define(117, KeyCode.F6);
	define(118, KeyCode.F7);
	define(119, KeyCode.F8);
	define(120, KeyCode.F9);
	define(121, KeyCode.F10);
	define(122, KeyCode.F11);
	define(123, KeyCode.F12);
	define(124, KeyCode.F13);
	define(125, KeyCode.F14);
	define(126, KeyCode.F15);
	define(127, KeyCode.F16);
	define(128, KeyCode.F17);
	define(129, KeyCode.F18);
	define(130, KeyCode.F19);

	define(144, KeyCode.NumLock);
	define(145, KeyCode.ScrollLock);

	define(186, KeyCode.US_SEMICOLON);
	define(187, KeyCode.US_EQUAL);
	define(188, KeyCode.US_COMMA);
	define(189, KeyCode.US_MINUS);
	define(190, KeyCode.US_DOT);
	define(191, KeyCode.US_SLASH);
	define(192, KeyCode.US_BACKTICK);
	define(193, KeyCode.ABNT_C1);
	define(194, KeyCode.ABNT_C2);
	define(219, KeyCode.US_OPEN_SQUARE_BRACKET);
	define(220, KeyCode.US_BACKSLASH);
	define(221, KeyCode.US_CLOSE_SQUARE_BRACKET);
	define(222, KeyCode.US_QUOTE);
	define(223, KeyCode.OEM_8);

	define(226, KeyCode.OEM_102);

	/**
	 * https://lists.w3.org/Archives/Public/www-dom/2010JulSep/att-0182/keyCode-spec.html
	 * If an Input Method Editor is processing key input and the event is keydown, return 229.
	 */
	define(229, KeyCode.KEY_IN_COMPOSITION);

	if (browser.isIE) {
		define(91, KeyCode.Meta);
	} else if (browser.isFirefox) {
		define(59, KeyCode.US_SEMICOLON);
		define(107, KeyCode.US_EQUAL);
		define(109, KeyCode.US_MINUS);
		if (platform.isMacintosh) {
			define(224, KeyCode.Meta);
		}
	} else if (browser.isWebKit) {
		define(91, KeyCode.Meta);
		if (platform.isMacintosh) {
			// the two meta keys in the Mac have different key codes (91 and 93)
			define(93, KeyCode.Meta);
		} else {
			define(92, KeyCode.Meta);
		}
	}
})();

function extractKeyCode(e: KeyboardEvent): KeyCode {
	if (e.charCode) {
		// "keypress" events mostly
		let char = String.fromCharCode(e.charCode).toUpperCase();
		return KeyCodeUtils.fromString(char);
	}
	return KEY_CODE_MAP[e.keyCode] || KeyCode.Unknown;
}

export function getCodeForKeyCode(keyCode: KeyCode): number {
	return INVERSE_KEY_CODE_MAP[keyCode];
}

export interface IKeyboardEvent {

	readonly _standardKeyboardEventBrand: true;

	readonly browserEvent: KeyboardEvent;
	readonly target: HTMLElement;

	readonly ctrlKey: boolean;
	readonly shiftKey: boolean;
	readonly altKey: boolean;
	readonly metaKey: boolean;
	readonly keyCode: KeyCode;
	readonly code: string;

	/**
	 * @internal
	 */
	toKeybinding(): SimpleKeybinding;
	equals(keybinding: number): boolean;

	preventDefault(): void;
	stopPropagation(): void;
}

const ctrlKeyMod = (platform.isMacintosh ? KeyMod.WinCtrl : KeyMod.CtrlCmd);
const altKeyMod = KeyMod.Alt;
const shiftKeyMod = KeyMod.Shift;
const metaKeyMod = (platform.isMacintosh ? KeyMod.CtrlCmd : KeyMod.WinCtrl);

export class StandardKeyboardEvent implements IKeyboardEvent {

	readonly _standardKeyboardEventBrand = true;

	public readonly browserEvent: KeyboardEvent;
	public readonly target: HTMLElement;

	public readonly ctrlKey: boolean;
	public readonly shiftKey: boolean;
	public readonly altKey: boolean;
	public readonly metaKey: boolean;
	public readonly keyCode: KeyCode;
	public readonly code: string;

	private _asKeybinding: number;
	private _asRuntimeKeybinding: SimpleKeybinding;

	constructor(source: KeyboardEvent) {
		let e = source;

		this.browserEvent = e;
		this.target = <HTMLElement>e.target;

		this.ctrlKey = e.ctrlKey;
		this.shiftKey = e.shiftKey;
		this.altKey = e.altKey;
		this.metaKey = e.metaKey;
		this.keyCode = extractKeyCode(e);
		this.code = e.code;

		// console.info(e.type + ": keyCode: " + e.keyCode + ", which: " + e.which + ", charCode: " + e.charCode + ", detail: " + e.detail + " ====> " + this.keyCode + ' -- ' + KeyCode[this.keyCode]);

		this.ctrlKey = this.ctrlKey || this.keyCode === KeyCode.Ctrl;
		this.altKey = this.altKey || this.keyCode === KeyCode.Alt;
		this.shiftKey = this.shiftKey || this.keyCode === KeyCode.Shift;
		this.metaKey = this.metaKey || this.keyCode === KeyCode.Meta;

		this._asKeybinding = this._computeKeybinding();
		this._asRuntimeKeybinding = this._computeRuntimeKeybinding();

		// console.log(`code: ${e.code}, keyCode: ${e.keyCode}, key: ${e.key}`);
	}

	public preventDefault(): void {
		if (this.browserEvent && this.browserEvent.preventDefault) {
			this.browserEvent.preventDefault();
		}
	}

	public stopPropagation(): void {
		if (this.browserEvent && this.browserEvent.stopPropagation) {
			this.browserEvent.stopPropagation();
		}
	}

	public toKeybinding(): SimpleKeybinding {
		return this._asRuntimeKeybinding;
	}

	public equals(other: number): boolean {
		return this._asKeybinding === other;
	}

	private _computeKeybinding(): number {
		let key = KeyCode.Unknown;
		if (this.keyCode !== KeyCode.Ctrl && this.keyCode !== KeyCode.Shift && this.keyCode !== KeyCode.Alt && this.keyCode !== KeyCode.Meta) {
			key = this.keyCode;
		}

		let result = 0;
		if (this.ctrlKey) {
			result |= ctrlKeyMod;
		}
		if (this.altKey) {
			result |= altKeyMod;
		}
		if (this.shiftKey) {
			result |= shiftKeyMod;
		}
		if (this.metaKey) {
			result |= metaKeyMod;
		}
		result |= key;

		return result;
	}

	private _computeRuntimeKeybinding(): SimpleKeybinding {
		let key = KeyCode.Unknown;
		if (this.keyCode !== KeyCode.Ctrl && this.keyCode !== KeyCode.Shift && this.keyCode !== KeyCode.Alt && this.keyCode !== KeyCode.Meta) {
			key = this.keyCode;
		}
		return new SimpleKeybinding(this.ctrlKey, this.shiftKey, this.altKey, this.metaKey, key);
	}
}