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const qs = require('querystring');

const {remote, ipcRenderer: ipc} = require('electron');

const {GitProcess} = require('dugite');

class AverageTracker {

constructor({limit} = {limit: 10}) {

// for now this serves a dual purpose - # of values tracked AND # discarded prior to starting avg calculation

this.limit = limit;

this.sum = 0;

this.values = [];

}

addValue(value) {

if (this.values.length >= this.limit) {

const discardedValue = this.values.shift();

this.sum -= discardedValue;

}

this.values.push(value);

this.sum += value;

}

getAverage() {

if (this.enoughData()) {

return this.sum / this.limit;

} else {

return null;

}

}

getLimit() {

return this.limit;

}

enoughData() {

return this.values.length === this.limit;

}

}

const query = qs.parse(window.location.search.substr(1));

const sourceWebContentsId = remote.getCurrentWindow().webContents.id;

const operationCountLimit = parseInt(query.operationCountLimit, 10);

const averageTracker = new AverageTracker({limit: operationCountLimit});

const childPidsById = new Map();

const destroyRenderer = () => {

if (!managerWebContents.isDestroyed()) {

managerWebContents.removeListener('crashed', destroyRenderer);

managerWebContents.removeListener('destroyed', destroyRenderer);

}

const win = remote.BrowserWindow.fromWebContents(remote.getCurrentWebContents());

if (win && !win.isDestroyed()) {

win.destroy();

}

};

const managerWebContentsId = parseInt(query.managerWebContentsId, 10);

const managerWebContents = remote.webContents.fromId(managerWebContentsId);

if (managerWebContents && !managerWebContents.isDestroyed()) {

managerWebContents.on('crashed', destroyRenderer);

managerWebContents.on('destroyed', destroyRenderer);

window.onbeforeunload = () => {

managerWebContents.removeListener('crashed', destroyRenderer);

managerWebContents.removeListener('destroyed', destroyRenderer);

};

}

const channelName = query.channelName;

ipc.on(channelName, (event, {type, data}) => {

if (type === 'git-exec') {

const {args, workingDir, options, id} = data;

if (args) {

document.getElementById('command').textContent = `git ${args.join(' ')}`;

}

options.processCallback = child => {

childPidsById.set(id, child.pid);

child.on('error', err => {

event.sender.sendTo(managerWebContentsId, channelName, {

sourceWebContentsId,

type: 'git-spawn-error',

data: {id, err},

});

});

child.stdin.on('error', err => {

event.sender.sendTo(managerWebContentsId, channelName, {

sourceWebContentsId,

type: 'git-stdin-error',

data: {id, stdin: options.stdin, err},

});

});

};

const spawnStart = performance.now();

GitProcess.exec(args, workingDir, options)

.then(({stdout, stderr, exitCode}) => {

const timing = {

spawnTime: spawnEnd - spawnStart,

execTime: performance.now() - spawnEnd,

};

childPidsById.delete(id);

event.sender.sendTo(managerWebContentsId, channelName, {

sourceWebContentsId,

type: 'git-data',

data: {

id,

average: averageTracker.getAverage(),

results: {stdout, stderr, exitCode, timing},

},

});

});

const spawnEnd = performance.now();

averageTracker.addValue(spawnEnd - spawnStart);

// TODO: consider using this to avoid duplicate write operations upon crashing.

// For now we won't do this to avoid clogging up ipc channel

// event.sender.sendTo(managerWebContentsId, channelName, {sourceWebContentsId, type: 'exec-started', data: {id}});

if (averageTracker.enoughData() && averageTracker.getAverage() > 20) {

event.sender.sendTo(managerWebContentsId, channelName, {type: 'slow-spawns'});

}

} else if (type === 'git-cancel') {

const {id} = data;

const childPid = childPidsById.get(id);

if (childPid !== undefined) {

require('tree-kill')(childPid, 'SIGINT', () => {

event.sender.sendTo(managerWebContentsId, channelName, {

sourceWebContentsId,

type: 'git-cancelled',

data: {id, childPid},

});

});

childPidsById.delete(id);

}

} else {

throw new Error(`Could not identify type ${type}`);

}

});

ipc.sendTo(managerWebContentsId, channelName, {sourceWebContentsId, type: 'renderer-ready', data: {pid: process.pid}});