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

import DOM = require('vs/base/browser/dom');
import Event, {Emitter} from 'vs/base/common/event';
import URI from 'vs/base/common/uri';
import cp = require('child_process');
import lifecycle = require('vs/base/common/lifecycle');
import nls = require('vs/nls');
import os = require('os');
import path = require('path');
import platform = require('vs/base/common/platform');
import xterm = require('xterm');
import {Dimension} from 'vs/base/browser/builder';
import {IContextKey} from 'vs/platform/contextkey/common/contextkey';
import {IKeybindingService} from 'vs/platform/keybinding/common/keybinding';
import {IMessageService, Severity} from 'vs/platform/message/common/message';
import {ITerminalInstance, ITerminalService} from 'vs/workbench/parts/terminal/electron-browser/terminal';
import {IStringDictionary} from 'vs/base/common/collections';
import {TerminalConfigHelper, IShell, ITerminalFont} from 'vs/workbench/parts/terminal/electron-browser/terminalConfigHelper';
import {IWorkspaceContextService, IWorkspace} from 'vs/platform/workspace/common/workspace';
import {Keybinding} from 'vs/base/common/keyCodes';
import {StandardKeyboardEvent} from 'vs/base/browser/keyboardEvent';
import {TabFocus} from 'vs/editor/common/config/commonEditorConfig';

export class TerminalInstance implements ITerminalInstance {
	private static ID_COUNTER = 1;
	private static EOL_REGEX = /\r?\n/g;


	private _id: number;
	private _title: string;
	private _onTitleChanged: Emitter<string>;
	public get id(): number { return this._id; }
	public get title(): string { return this._title; }
	public get onTitleChanged(): Event<string> { return this._onTitleChanged.event; }

	private isExiting: boolean = false;
	private toDispose: lifecycle.IDisposable[] = [];
	private skipTerminalKeybindings: Keybinding[] = [];
	private process: cp.ChildProcess;
	private xterm: any;
	// TODO: Improve HTML element names?
	private wrapperElement: HTMLDivElement;
	private terminalDomElement: HTMLDivElement;
	// TODO: Is font needed, just grab off configHelper?
	private font: ITerminalFont;

	public constructor(
		private terminalFocusContextKey: IContextKey<boolean>,
		private onExitCallback: (TerminalInstance) => void,
		private configHelper: TerminalConfigHelper,
		private container: HTMLElement,
		name: string,
		shellPath: string,
		@IKeybindingService private keybindingService: IKeybindingService,
		@IMessageService private messageService: IMessageService,
		@ITerminalService private terminalService: ITerminalService,
		@IWorkspaceContextService private contextService: IWorkspaceContextService
	) {
		this._id = TerminalInstance.ID_COUNTER++;
		this._onTitleChanged = new Emitter<string>();
		this.createProcess(name, shellPath);

		if (container) {
			this.attachToElement(container);
		}
	}

	public attachToElement(container: HTMLElement): void {
		if (this.wrapperElement) {
			throw new Error('The terminal instance has already been attached to a container');
		}

		this.setFont(this.configHelper.getFont());

		this.wrapperElement = document.createElement('div');
		DOM.addClass(this.wrapperElement, 'terminal-wrapper');
		this.terminalDomElement = document.createElement('div');

		this.xterm = xterm();
		this.xterm.open(this.terminalDomElement);

		this.process.on('message', (message) => {
			if (message.type === 'data') {
				this.xterm.write(message.content);
			}
		});
		this.xterm.on('data', (data) => {
			this.process.send({
				event: 'input',
				data: this.sanitizeInput(data)
			});
			return false;
		});
		this.xterm.attachCustomKeydownHandler((event: KeyboardEvent) => {
			// Allow the toggle tab mode keybinding to pass through the terminal so that focus can
			// be escaped
			let standardKeyboardEvent = new StandardKeyboardEvent(event);
			if (this.skipTerminalKeybindings.some((k) => standardKeyboardEvent.equals(k.value))) {
				event.preventDefault();
				return false;
			}

			// If tab focus mode is on, tab is not passed to the terminal
			if (TabFocus.getTabFocusMode() && event.keyCode === 9) {
				return false;
			}
		});

		let xtermHelper: HTMLElement = this.xterm.element.querySelector('.xterm-helpers');
		let focusTrap: HTMLElement = document.createElement('div');
		focusTrap.setAttribute('tabindex', '0');
		DOM.addClass(focusTrap, 'focus-trap');
		focusTrap.addEventListener('focus', function (event: FocusEvent) {
			let currentElement = focusTrap;
			while (!DOM.hasClass(currentElement, 'part')) {
				currentElement = currentElement.parentElement;
			}
			let hidePanelElement = <HTMLElement>currentElement.querySelector('.hide-panel-action');
			hidePanelElement.focus();
		});
		xtermHelper.insertBefore(focusTrap, this.xterm.textarea);

		this.toDispose.push(DOM.addDisposableListener(this.xterm.textarea, 'focus', (event: KeyboardEvent) => {
			this.terminalFocusContextKey.set(true);
		}));
		this.toDispose.push(DOM.addDisposableListener(this.xterm.textarea, 'blur', (event: KeyboardEvent) => {
			this.terminalFocusContextKey.reset();
		}));
		this.toDispose.push(DOM.addDisposableListener(this.xterm.element, 'focus', (event: KeyboardEvent) => {
			this.terminalFocusContextKey.set(true);
		}));
		this.toDispose.push(DOM.addDisposableListener(this.xterm.element, 'blur', (event: KeyboardEvent) => {
			this.terminalFocusContextKey.reset();
		}));

		this.wrapperElement.appendChild(this.terminalDomElement);
		this.container.appendChild(this.wrapperElement);

		this.layout(new Dimension(this.container.offsetWidth, this.container.offsetHeight));
	}

	public copySelection(): void {
		// TODO: Implement
	}

	public dispose(): void {
		if (this.wrapperElement) {
			this.container.removeChild(this.wrapperElement);
			this.wrapperElement = null;
		}
		if (this.xterm) {
			this.xterm.destroy();
			this.xterm = null;
		}
		if (this.process) {
			if (this.process.connected) {
				this.process.disconnect();
				this.process.kill();
			}
			this.process = null;
		}
		this.toDispose = lifecycle.dispose(this.toDispose);
		this.onExitCallback(this);
	}

	public focus(): void {
		// TODO: Implement
	}

	public paste(): void {
		// TODO: Implement
	}

	public sendText(text: string, addNewLine: boolean): void {
		// TODO: Implement
	}

	public setVisible(visible: boolean): void {
		DOM.toggleClass(this.wrapperElement, 'active', visible);
	}

	public scrollDown(): void {
		// TODO: Implement
	}

	public scrollUp(): void {
		// TODO: Implement
	}

	private sanitizeInput(data: any) {
		return typeof data === 'string' ? data.replace(TerminalInstance.EOL_REGEX, os.EOL) : data;
	}

	private createProcess(name?: string, shellPath?: string) {
		let locale = this.configHelper.isSetLocaleVariables() ? platform.locale : undefined;
		let shell = shellPath ? { executable: shellPath, args: [] } : this.configHelper.getShell();
		let env = this.createTerminalEnv(process.env, shell, this.contextService.getWorkspace(), locale);
		this._title = name ? name : '';
		this.process = cp.fork('./terminalProcess', [], {
			env: env,
			cwd: URI.parse(path.dirname(require.toUrl('./terminalProcess'))).fsPath
		});
		if (!name) {
			// Only listen for process title changes when a name is not provided
			this.process.on('message', (message) => {
				if (message.type === 'title') {
					this._title = message.content ? message.content : '';
					// TODO: Send title change notification to service/panel
					this._onTitleChanged.fire();
				}
			});
		}
		this.process.on('exit', (exitCode) => {
			// Prevent dispose functions being triggered multiple times
			if (!this.isExiting) {
				this.isExiting = true;
				this.dispose();
				if (exitCode) {
					this.messageService.show(Severity.Error, nls.localize('terminal.integrated.exitedWithCode', 'The terminal process terminated with exit code: {0}', exitCode));
				}
			}
		});
	}

	public createTerminalEnv(parentEnv: IStringDictionary<string>, shell: IShell, workspace: IWorkspace, locale?: string): IStringDictionary<string> {
		let env = this.cloneEnv(parentEnv);
		env['PTYPID'] = process.pid.toString();
		env['PTYSHELL'] = shell.executable;
		shell.args.forEach((arg, i) => {
			env[`PTYSHELLARG${i}`] = arg;
		});
		env['PTYCWD'] = this.sanitizeCwd(workspace ? workspace.resource.fsPath : os.homedir());
		if (locale) {
			env['LANG'] = this.getLangEnvVariable(locale);
		}
		return env;
	}

	private sanitizeCwd(cwd: string) {
		// Make the drive letter uppercase on Windows (see #9448)
		if (platform.platform === platform.Platform.Windows && cwd && cwd[1] === ':') {
			return cwd[0].toUpperCase() + cwd.substr(1);
		}
		return cwd;
	}

	private cloneEnv(env: IStringDictionary<string>): IStringDictionary<string> {
		let newEnv: IStringDictionary<string> = Object.create(null);
		Object.keys(env).forEach((key) => {
			newEnv[key] = env[key];
		});
		return newEnv;
	}

	private getLangEnvVariable(locale: string) {
		const parts = locale.split('-');
		const n = parts.length;
		if (n > 1) {
			parts[n - 1] = parts[n - 1].toUpperCase();
		}
		return parts.join('_') + '.UTF-8';
	}

	public setFont(font: ITerminalFont): void {
		this.font = font;
	}

	public setCursorBlink(blink: boolean): void {
		if (this.xterm && this.xterm.cursorBlink !== blink) {
			this.xterm.cursorBlink = blink;
			this.xterm.refresh(0, this.xterm.rows - 1);
		}
	}

	public setCommandsToSkipShell(commands: string[]): void {
		this.skipTerminalKeybindings = commands.map((c) => {
			return this.keybindingService.lookupKeybindings(c);
		}).reduce((prev, curr) => {
			return prev.concat(curr);
		});
	}

	public layout(dimension: Dimension): void {
		if (!this.font || !this.font.charWidth || !this.font.charHeight) {
			return;
		}
		if (!dimension.height) { // Minimized
			return;
		}
		let leftPadding = parseInt(getComputedStyle(document.querySelector('.terminal-outer-container')).paddingLeft.split('px')[0], 10);
		let innerWidth = dimension.width - leftPadding;
		let cols = Math.floor(innerWidth / this.font.charWidth);
		let rows = Math.floor(dimension.height / this.font.charHeight);
		if (this.xterm) {
			this.xterm.resize(cols, rows);
			this.xterm.element.style.width = innerWidth + 'px';
		}
		if (this.process.connected) {
			this.process.send({
				event: 'resize',
				cols: cols,
				rows: rows
			});
		}
	}
}

// import DOM = require('vs/base/browser/dom');
// import URI from 'vs/base/common/uri';
// import cp = require('child_process');
// import lifecycle = require('vs/base/common/lifecycle');
// import nls = require('vs/nls');
// import os = require('os');
// import path = require('path');
// import platform = require('vs/base/common/platform');
// import xterm = require('xterm');
// import {Dimension} from 'vs/base/browser/builder';
// import {IContextMenuService} from 'vs/platform/contextview/browser/contextView';
// import {IInstantiationService} from 'vs/platform/instantiation/common/instantiation';
// import {IKeybindingService} from 'vs/platform/keybinding/common/keybinding';
// import {IContextKey} from 'vs/platform/contextkey/common/contextkey';
// import {IMessageService, Severity} from 'vs/platform/message/common/message';
// import {ITerminalFont} from 'vs/workbench/parts/terminal/electron-browser/terminalConfigHelper';
// import {ITerminalInstance, ITerminalService} from 'vs/workbench/parts/terminal/electron-browser/terminal';
// import {IStringDictionary} from 'vs/base/common/collections';
// import {IShell, TerminalConfigHelper} from 'vs/workbench/parts/terminal/electron-browser/terminalConfigHelper';
// import {IWorkspaceContextService} from 'vs/platform/workspace/common/workspace';
// import {Keybinding} from 'vs/base/common/keyCodes';
// import {StandardKeyboardEvent} from 'vs/base/browser/keyboardEvent';
// import {TabFocus} from 'vs/editor/common/config/commonEditorConfig';

// export class TerminalInstance {

// 	public id: number;

// 	private static eolRegex = /\r?\n/g;

// 	private isExiting: boolean = false;
// 	private skipTerminalKeybindings: Keybinding[] = [];

// 	private toDispose: lifecycle.IDisposable[];
// 	private xterm;
// 	private terminalDomElement: HTMLDivElement;
// 	private wrapperElement: HTMLDivElement;
// 	private font: ITerminalFont;

// 	public constructor(
// 		private terminalProcess: ITerminalProcess,
// 		private parentDomElement: HTMLElement,
// 		private contextMenuService: IContextMenuService,
// 		private contextService: IWorkspaceContextService,
// 		private instantiationService: IInstantiationService,
// 		private keybindingService: IKeybindingService,
// 		private terminalService: ITerminalService,
// 		private messageService: IMessageService,
// 		private terminalFocusContextKey: IContextKey<boolean>,
// 		private onExitCallback: (TerminalInstance) => void
// 	) {
// 		this.toDispose = [];
// 		this.wrapperElement = document.createElement('div');
// 		DOM.addClass(this.wrapperElement, 'terminal-wrapper');
// 		this.terminalDomElement = document.createElement('div');
// 		this.xterm = xterm();

// 		this.id = this.terminalProcess.process.pid;
// 		this.terminalProcess.process.on('message', (message) => {
// 			if (message.type === 'data') {
// 				this.xterm.write(message.content);
// 			}
// 		});
// 		this.xterm.on('data', (data) => {
// 			this.terminalProcess.process.send({
// 				event: 'input',
// 				data: this.sanitizeInput(data)
// 			});
// 			return false;
// 		});
// 		this.xterm.attachCustomKeydownHandler((event: KeyboardEvent) => {
// 			// Allow the toggle tab mode keybinding to pass through the terminal so that focus can
// 			// be escaped
// 			let standardKeyboardEvent = new StandardKeyboardEvent(event);
// 			if (this.skipTerminalKeybindings.some((k) => standardKeyboardEvent.equals(k.value))) {
// 				event.preventDefault();
// 				return false;
// 			}

// 			// If tab focus mode is on, tab is not passed to the terminal
// 			if (TabFocus.getTabFocusMode() && event.keyCode === 9) {
// 				return false;
// 			}
// 		});
// 		this.terminalProcess.process.on('exit', (exitCode) => {
// 			// Prevent dispose functions being triggered multiple times
// 			if (!this.isExiting) {
// 				this.isExiting = true;
// 				this.dispose();
// 				if (exitCode) {
// 					this.messageService.show(Severity.Error, nls.localize('terminal.integrated.exitedWithCode', 'The terminal process terminated with exit code: {0}', exitCode));
// 				}
// 				this.onExitCallback(this);
// 			}
// 		});

// 		this.xterm.open(this.terminalDomElement);


// 		let xtermHelper: HTMLElement = this.xterm.element.querySelector('.xterm-helpers');
// 		let focusTrap: HTMLElement = document.createElement('div');
// 		focusTrap.setAttribute('tabindex', '0');
// 		DOM.addClass(focusTrap, 'focus-trap');
// 		focusTrap.addEventListener('focus', function (event: FocusEvent) {
// 			let currentElement = focusTrap;
// 			while (!DOM.hasClass(currentElement, 'part')) {
// 				currentElement = currentElement.parentElement;
// 			}
// 			let hidePanelElement = <HTMLElement>currentElement.querySelector('.hide-panel-action');
// 			hidePanelElement.focus();
// 		});
// 		xtermHelper.insertBefore(focusTrap, this.xterm.textarea);

// 		this.toDispose.push(DOM.addDisposableListener(this.xterm.textarea, 'focus', (event: KeyboardEvent) => {
// 			this.terminalFocusContextKey.set(true);
// 		}));
// 		this.toDispose.push(DOM.addDisposableListener(this.xterm.textarea, 'blur', (event: KeyboardEvent) => {
// 			this.terminalFocusContextKey.reset();
// 		}));
// 		this.toDispose.push(DOM.addDisposableListener(this.xterm.element, 'focus', (event: KeyboardEvent) => {
// 			this.terminalFocusContextKey.set(true);
// 		}));
// 		this.toDispose.push(DOM.addDisposableListener(this.xterm.element, 'blur', (event: KeyboardEvent) => {
// 			this.terminalFocusContextKey.reset();
// 		}));

// 		this.wrapperElement.appendChild(this.terminalDomElement);
// 		this.parentDomElement.appendChild(this.wrapperElement);
// 	}

// 	private sanitizeInput(data: any) {
// 		return typeof data === 'string' ? data.replace(TerminalInstance.eolRegex, os.EOL) : data;
// 	}

// 	public layout(dimension: Dimension): void {
// 		if (!this.font || !this.font.charWidth || !this.font.charHeight) {
// 			return;
// 		}
// 		if (!dimension.height) { // Minimized
// 			return;
// 		}
// 		let leftPadding = parseInt(getComputedStyle(document.querySelector('.terminal-outer-container')).paddingLeft.split('px')[0], 10);
// 		let innerWidth = dimension.width - leftPadding;
// 		let cols = Math.floor(innerWidth / this.font.charWidth);
// 		let rows = Math.floor(dimension.height / this.font.charHeight);
// 		if (this.xterm) {
// 			this.xterm.resize(cols, rows);
// 			this.xterm.element.style.width = innerWidth + 'px';
// 		}
// 		if (this.terminalProcess.process.connected) {
// 			this.terminalProcess.process.send({
// 				event: 'resize',
// 				cols: cols,
// 				rows: rows
// 			});
// 		}
// 	}

// 	public toggleVisibility(visible: boolean) {
// 		DOM.toggleClass(this.wrapperElement, 'active', visible);
// 	}

// 	public setFont(font: ITerminalFont): void {
// 		this.font = font;
// 	}

// 	public setCursorBlink(blink: boolean): void {
// 		if (this.xterm && this.xterm.cursorBlink !== blink) {
// 			this.xterm.cursorBlink = blink;
// 			this.xterm.refresh(0, this.xterm.rows - 1);
// 		}
// 	}

// 	public setCommandsToSkipShell(commands: string[]): void {
// 		this.skipTerminalKeybindings = commands.map((c) => {
// 			return this.keybindingService.lookupKeybindings(c);
// 		}).reduce((prev, curr) => {
// 			return prev.concat(curr);
// 		});
// 	}

// 	public sendText(text: string, addNewLine: boolean): void {;
// 		if (addNewLine && text.substr(text.length - os.EOL.length) !== os.EOL) {
// 			text += os.EOL;
// 		}
// 		this.terminalProcess.process.send({
// 			event: 'input',
// 			data: text
// 		});
// 	}

// 	public focus(force?: boolean): void {
// 		if (!this.xterm) {
// 			return;
// 		}
// 		let text = window.getSelection().toString();
// 		if (!text || force) {
// 			this.xterm.focus();
// 		}
// 	}

// 	public scrollDown(): void {
// 		this.xterm.scrollDisp(1);
// 	}

// 	public scrollUp(): void {
// 		this.xterm.scrollDisp(-1);
// 	}

// 	public dispose(): void {
// 		if (this.wrapperElement) {
// 			this.parentDomElement.removeChild(this.wrapperElement);
// 			this.wrapperElement = null;
// 		}
// 		if (this.xterm) {
// 			this.xterm.destroy();
// 			this.xterm = null;
// 		}
// 		if (this.terminalProcess) {
// 			this.terminalService.killTerminalProcess(this.terminalProcess);
// 			this.terminalProcess = null;
// 		}
// 		this.toDispose = lifecycle.dispose(this.toDispose);
// 	}
// }