/**

* Copyright (c) 2012-2015, Christopher Jeffrey (MIT License)

* Copyright (c) 2016, Daniel Imms (MIT License).

*/

import * as path from 'path';

import { Socket } from 'net';

import { EventEmitter } from 'events';

import { ITerminal, IPtyForkOptions } from './interfaces';

export const DEFAULT_COLS: number = 80;

export const DEFAULT_ROWS: number = 24;

export abstract class Terminal implements ITerminal {

protected _socket: Socket;

protected _pid: number;

protected _fd: number;

protected _pty: any;

protected _file: string;

protected _name: string;

protected _cols: number;

protected _rows: number;

protected _readable: boolean;

protected _writable: boolean;

protected _internalee: EventEmitter;

public get pid(): number { return this._pid; }

constructor(opt?: IPtyForkOptions) {

// for 'close'

this._internalee = new EventEmitter();

if (!opt) {

return;

}

// Do basic type checks here in case node-pty is being used within JavaScript. If the wrong

// types go through to the C++ side it can lead to hard to diagnose exceptions.

this._checkType('name', opt.name ? opt.name : null, 'string');

this._checkType('cols', opt.cols ? opt.cols : null, 'number');

this._checkType('rows', opt.rows ? opt.rows : null, 'number');

this._checkType('cwd', opt.cwd ? opt.cwd : null, 'string');

this._checkType('env', opt.env ? opt.env : null, 'object');

this._checkType('uid', opt.uid ? opt.uid : null, 'number');

this._checkType('gid', opt.gid ? opt.gid : null, 'number');

this._checkType('encoding', opt.encoding ? opt.encoding : null, 'string');

}

private _checkType(name: string, value: any, type: string): void {

if (value && typeof value !== type) {

throw new Error(`${name} must be a ${type} (not a ${typeof value})`);

}

}

/** See net.Socket.end */

public end(data: string): void {

this._socket.end(data);

}

/** See stream.Readable.pipe */

public pipe(dest: any, options: any): any {

return this._socket.pipe(dest, options);

}

/** See net.Socket.pause */

public pause(): Socket {

return this._socket.pause();

}

/** See net.Socket.resume */

public resume(): Socket {

return this._socket.resume();

}

/** See net.Socket.setEncoding */

public setEncoding(encoding: string): void {

if ((<any>this._socket)._decoder) {

delete (<any>this._socket)._decoder;

}

if (encoding) {

this._socket.setEncoding(encoding);

}

}

public addListener(eventName: string, listener: (...args: any[]) => any): void { this.on(eventName, listener); }

public on(eventName: string, listener: (...args: any[]) => any): void {

if (eventName === 'close') {

this._internalee.on('close', listener);

return;

}

this._socket.on(eventName, listener);

}

public emit(eventName: string, ...args: any[]): any {

if (eventName === 'close') {

return this._internalee.emit.apply(this._internalee, arguments);

}

return this._socket.emit.apply(this._socket, arguments);

}

public listeners(eventName: string): Function[] {

return this._socket.listeners(eventName);

}

public removeListener(eventName: string, listener: (...args: any[]) => any): void {

this._socket.removeListener(eventName, listener);

}

public removeAllListeners(eventName: string): void {

this._socket.removeAllListeners(eventName);

}

public once(eventName: string, listener: (...args: any[]) => any): void {

this._socket.once(eventName, listener);

}

public abstract write(data: string): void;

public abstract resize(cols: number, rows: number): void;

public abstract destroy(): void;

public abstract kill(signal?: string): void;

public abstract get process(): string;

public abstract get master(): Socket;

public abstract get slave(): Socket;

// TODO: Should this be in the API?

public redraw(): void {

let cols = this._cols;

let rows = this._rows;

// We could just send SIGWINCH, but most programs will ignore it if the

// size hasn't actually changed.

this.resize(cols + 1, rows + 1);

setTimeout(() => this.resize(cols, rows), 30);

}

protected _close(): void {

this._socket.writable = false;

this._socket.readable = false;

this.write = () => {};

this.end = () => {};

this._writable = false;

this._readable = false;

}

protected _parseEnv(env: {[key: string]: string}): string[] {

const keys = Object.keys(env || {});

const pairs = [];

for (let i = 0; i < keys.length; i++) {

pairs.push(keys[i] + '=' + env[keys[i]]);

}

return pairs;

}

}