/*
 * decaffeinate suggestions:
 * DS101: Remove unnecessary use of Array.from
 * DS102: Remove unnecessary code created because of implicit returns
 * DS206: Consider reworking classes to avoid initClass
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
const sinon = require('sinon');
const chai = require('chai');
const should = chai.should();
const modulePath = "../../../../app/js/LockManager.js";
const SandboxedModule = require('sandboxed-module');

describe('LockManager - getting the lock', function() {
	beforeEach(function() {
		let Profiler;
		this.LockManager = SandboxedModule.require(modulePath, { requires: {
			"logger-sharelatex": { log() {}
		},
			"redis-sharelatex": {
				createClient : () => {
					return {auth() {}};
				}
			},
			"./Metrics": {inc() {}},
			"./Profiler": (Profiler = (function() {
				Profiler = class Profiler {
					static initClass() {
						this.prototype.log = sinon.stub().returns({ end: sinon.stub() });
						this.prototype.end = sinon.stub();
					}
				};
				Profiler.initClass();
				return Profiler;
			})())
		}
	}
		);
		this.callback = sinon.stub();
		return this.doc_id = "doc-id-123";
	});
	
	describe("when the lock is not set", function() {
		beforeEach(function(done) {
			this.lockValue = "mock-lock-value";
			this.LockManager.tryLock = sinon.stub().callsArgWith(1, null, true, this.lockValue);
			return this.LockManager.getLock(this.doc_id, (...args) => {
				this.callback(...Array.from(args || []));
				return done();
			});
		});

		it("should try to get the lock", function() {
			return this.LockManager.tryLock
				.calledWith(this.doc_id)
				.should.equal(true);
		});

		it("should only need to try once", function() {
			return this.LockManager.tryLock.callCount.should.equal(1);
		});

		return it("should return the callback with the lock value", function() {
			return this.callback.calledWith(null, this.lockValue).should.equal(true);
		});
	});

	describe("when the lock is initially set", function() {
		beforeEach(function(done) {
			this.lockValue = "mock-lock-value";
			const startTime = Date.now();
			let tries = 0;
			this.LockManager.LOCK_TEST_INTERVAL = 5;
			this.LockManager.tryLock = (doc_id, callback) => {
				if (callback == null) { callback = function(error, isFree) {}; }
				if (((Date.now() - startTime) < 20) || (tries < 2)) {
					tries = tries + 1;
					return callback(null, false);
				} else {
					return callback(null, true, this.lockValue);
				}
			};
			sinon.spy(this.LockManager, "tryLock");

			return this.LockManager.getLock(this.doc_id, (...args) => {
				this.callback(...Array.from(args || []));
				return done();
			});
		});

		it("should call tryLock multiple times until free", function() {
			return (this.LockManager.tryLock.callCount > 1).should.equal(true);
		});

		return it("should return the callback with the lock value", function() {
			return this.callback.calledWith(null, this.lockValue).should.equal(true);
		});
	});

	return describe("when the lock times out", function() {
		beforeEach(function(done) {
			const time = Date.now();
			this.LockManager.MAX_LOCK_WAIT_TIME = 5;
			this.LockManager.tryLock = sinon.stub().callsArgWith(1, null, false);
			return this.LockManager.getLock(this.doc_id, (...args) => {
				this.callback(...Array.from(args || []));
				return done();
			});
		});

		return it("should return the callback with an error", function() {
			const e = new Error("Timeout");
			e.doc_id = this.doc_id;
			return this.callback.calledWith(e).should.equal(true);
		});
	});
});