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// Measure elapsed durations from specific beginning points.

import fs from 'fs-extra';

import path from 'path';

// The maximum number of marks within a single DurationSet. A DurationSet will be automatically finished if this many

// marks are recorded.

const MAXIMUM_MARKS = 100;

// Flush all non-active DurationSets to disk each time that this many marks have been accumulated.

const PERSIST_INTERVAL = 1000;

// A sequence of durations measured from a fixed beginning point.

class DurationSet {

constructor(name) {

this.name = name;

this.startTimestamp = performance.now();

this.marks = [];

this.markCount = 0;

if (atom.config.get('github.performanceToConsole')) {

// eslint-disable-next-line no-console

console.log('%cbegin %c%s:begin',

'font-weight: bold',

'font-weight: normal; font-style: italic; color: blue', this.name);

}

if (atom.config.get('github.performanceToProfile')) {

// eslint-disable-next-line no-console

console.profile(this.name);

}

}

mark(eventName) {

const duration = performance.now() - this.startTimestamp;

if (atom.config.get('github.performanceToConsole')) {

// eslint-disable-next-line no-console

console.log('%cmark %c%s:%s %c%dms',

'font-weight: bold',

'font-weight: normal; font-style: italic; color: blue', this.name, eventName,

'font-style: normal; color: black', duration);

}

if (atom.config.get('github.performanceToDirectory') !== '') {

this.marks.push({eventName, duration});

}

this.markCount++;

if (this.markCount >= MAXIMUM_MARKS) {

this.finish();

}

}

finish() {

this.mark('finish');

if (atom.config.get('github.performanceToProfile')) {

// eslint-disable-next-line no-console

console.profileEnd(this.name);

}

}

serialize() {

return {

name: this.name,

markers: this.marks,

};

}

getCount() {

return this.marks.length;

}

}

let durationSets = [];

let totalMarkCount = 0;

const activeSets = new Map();

function shouldCapture(seriesName, eventName) {

const anyActive = ['Console', 'Directory', 'Profile'].some(kind => {

const value = atom.config.get(`github.performanceTo${kind}`);

return value !== '' && value !== false;

});

if (!anyActive) {

return false;

}

const mask = new RegExp(atom.config.get('github.performanceMask'));

if (!mask.test(`${seriesName}:${eventName}`)) {

return false;

}

return true;

}

const yardstick = {

async save() {

const destDir = atom.config.get('github.performanceToDirectory');

if (destDir === '' || destDir === undefined || destDir === null) {

return;

}

const fileName = path.join(destDir, `performance-${Date.now()}.json`);

await new Promise((resolve, reject) => {

fs.ensureDir(destDir, err => (err ? reject(err) : resolve()));

});

const payload = JSON.stringify(durationSets.map(set => set.serialize()));

await fs.writeFile(fileName, payload, {encoding: 'utf8'});

if (atom.config.get('github.performanceToConsole')) {

// eslint-disable-next-line no-console

console.log('%csaved %c%d series to %s',

'font-weight: bold',

'font-weight: normal; color: black', durationSets.length, fileName);

}

durationSets = [];

},

begin(seriesName) {

if (!shouldCapture(seriesName, 'begin')) {

return;

}

const ds = new DurationSet(seriesName);

activeSets.set(seriesName, ds);

},

mark(seriesName, eventName) {

if (seriesName instanceof Array) {

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

this.mark(seriesName[i], eventName);

}

return;

}

if (!shouldCapture(seriesName, eventName)) {

return;

}

const ds = activeSets.get(seriesName);

if (ds === undefined) {

return;

}

ds.mark(eventName);

},

finish(seriesName) {

if (seriesName instanceof Array) {

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

this.finish(seriesName[i]);

}

return;

}

if (!shouldCapture(seriesName, 'finish')) {

return;

}

const ds = activeSets.get(seriesName);

if (ds === undefined) {

return;

}

ds.finish();

durationSets.push(ds);

activeSets.delete(seriesName);

totalMarkCount += ds.getCount();

if (totalMarkCount >= PERSIST_INTERVAL) {

totalMarkCount = 0;

this.save();

}

},

async flush() {

durationSets.push(...activeSets.values());

activeSets.clear();

await this.save();

},

};

export default yardstick;