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/// <reference path="node.d.ts" />

/// <reference path="session.ts" />

// used in fs.writeSync

/* tslint:disable:no-null */

namespace ts.server {

const readline: NodeJS.ReadLine = require("readline");

const fs: typeof NodeJS.fs = require("fs");

const rl = readline.createInterface({

input: process.stdin,

output: process.stdout,

terminal: false,

});

class Logger implements ts.server.Logger {

fd = -1;

seq = 0;

inGroup = false;

firstInGroup = true;

constructor(public logFilename: string, public level: string) {

}

static padStringRight(str: string, padding: string) {

return (str + padding).slice(0, padding.length);

}

close() {

if (this.fd >= 0) {

fs.close(this.fd);

}

}

perftrc(s: string) {

this.msg(s, "Perf");

}

info(s: string) {

this.msg(s, "Info");

}

startGroup() {

this.inGroup = true;

this.firstInGroup = true;

}

endGroup() {

this.inGroup = false;

this.seq++;

this.firstInGroup = true;

}

loggingEnabled() {

return !!this.logFilename;

}

isVerbose() {

return this.loggingEnabled() && (this.level == "verbose");

}

msg(s: string, type = "Err") {

if (this.fd < 0) {

if (this.logFilename) {

this.fd = fs.openSync(this.logFilename, "w");

}

}

if (this.fd >= 0) {

s = s + "\n";

const prefix = Logger.padStringRight(type + " " + this.seq.toString(), " ");

if (this.firstInGroup) {

s = prefix + s;

this.firstInGroup = false;

}

if (!this.inGroup) {

this.seq++;

this.firstInGroup = true;

}

const buf = new Buffer(s);

fs.writeSync(this.fd, buf, 0, buf.length, null);

}

}

}

class IOSession extends Session {

constructor(host: ServerHost, logger: ts.server.Logger) {

super(host, Buffer.byteLength, process.hrtime, logger);

}

exit() {

this.projectService.log("Exiting...", "Info");

this.projectService.closeLog();

process.exit(0);

}

listen() {

rl.on("line", (input: string) => {

const message = input.trim();

this.onMessage(message);

});

rl.on("close", () => {

this.exit();

});

}

}

interface LogOptions {

file?: string;

detailLevel?: string;

}

function parseLoggingEnvironmentString(logEnvStr: string): LogOptions {

const logEnv: LogOptions = {};

const args = logEnvStr.split(" ");

for (let i = 0, len = args.length; i < (len - 1); i += 2) {

const option = args[i];

const value = args[i + 1];

if (option && value) {

switch (option) {

case "-file":

logEnv.file = value;

break;

case "-level":

logEnv.detailLevel = value;

break;

}

}

}

return logEnv;

}

// TSS_LOG "{ level: "normal | verbose | terse", file?: string}"

function createLoggerFromEnv() {

let fileName: string = undefined;

let detailLevel = "normal";

const logEnvStr = process.env["TSS_LOG"];

if (logEnvStr) {

const logEnv = parseLoggingEnvironmentString(logEnvStr);

if (logEnv.file) {

fileName = logEnv.file;

}

else {

fileName = __dirname + "/.log" + process.pid.toString();

}

if (logEnv.detailLevel) {

detailLevel = logEnv.detailLevel;

}

}

return new Logger(fileName, detailLevel);

}

// This places log file in the directory containing editorServices.js

// TODO: check that this location is writable

const logger = createLoggerFromEnv();

const pending: string[] = [];

let canWrite = true;

function writeMessage(s: string) {

if (!canWrite) {

pending.push(s);

}

else {

canWrite = false;

process.stdout.write(new Buffer(s, "utf8"), setCanWriteFlagAndWriteMessageIfNecessary);

}

}

function setCanWriteFlagAndWriteMessageIfNecessary() {

canWrite = true;

if (pending.length) {

writeMessage(pending.shift());

}

}

// Override sys.write because fs.writeSync is not reliable on Node 4

ts.sys.write = (s: string) => writeMessage(s);

const ioSession = new IOSession(ts.sys, logger);

process.on("uncaughtException", function(err: Error) {

ioSession.logError(err, "unknown");

});

// Start listening

ioSession.listen();

}