/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
const should = require('chai').should();
const sinon = require("sinon");
const SandboxedModule = require('sandboxed-module');
const path = require("path");
const modulePath = path.join(__dirname, "../../../app/js/DrainManager");

describe("DrainManager", function() {
	beforeEach(function() {
		this.DrainManager = SandboxedModule.require(modulePath, { requires: {
			"logger-sharelatex": (this.logger = {log: sinon.stub()})
		}
	}
		);
		return this.io = {
			sockets: {
				clients: sinon.stub()
			}
		};
	});

	describe("startDrainTimeWindow", function() {
		beforeEach(function() {
			this.clients = [];
			for (let i = 0; i <= 5399; i++) {
				this.clients[i] = {
					id: i,
					emit: sinon.stub()
				};
			}
			this.io.sockets.clients.returns(this.clients);
			return this.DrainManager.startDrain = sinon.stub();
		});

		return it("should set a drain rate fast enough", function(done){
			this.DrainManager.startDrainTimeWindow(this.io, 9);
			this.DrainManager.startDrain.calledWith(this.io, 10).should.equal(true);
			return done();
		});
	});


	return describe("reconnectNClients", function() {
		beforeEach(function() {
			this.clients = [];
			for (let i = 0; i <= 9; i++) {
				this.clients[i] = {
					id: i,
					emit: sinon.stub()
				};
			}
			return this.io.sockets.clients.returns(this.clients);
		});

		return describe("after first pass", function() {
			beforeEach(function() {
				return this.DrainManager.reconnectNClients(this.io, 3);
			});
			
			it("should reconnect the first 3 clients", function() {
				return [0, 1, 2].map((i) =>
					this.clients[i].emit.calledWith("reconnectGracefully").should.equal(true));
			});
			
			it("should not reconnect any more clients", function() {
				return [3, 4, 5, 6, 7, 8, 9].map((i) =>
					this.clients[i].emit.calledWith("reconnectGracefully").should.equal(false));
			});
			
			return describe("after second pass", function() {
				beforeEach(function() {
					return this.DrainManager.reconnectNClients(this.io, 3);
				});
				
				it("should reconnect the next 3 clients", function() {
					return [3, 4, 5].map((i) =>
						this.clients[i].emit.calledWith("reconnectGracefully").should.equal(true));
				});
				
				it("should not reconnect any more clients", function() {
					return [6, 7, 8, 9].map((i) =>
						this.clients[i].emit.calledWith("reconnectGracefully").should.equal(false));
				});
				
				it("should not reconnect the first 3 clients again", function() {
					return [0, 1, 2].map((i) =>
						this.clients[i].emit.calledOnce.should.equal(true));
				});
				
				return describe("after final pass", function() {
					beforeEach(function() {
						return this.DrainManager.reconnectNClients(this.io, 100);
					});
				
					it("should not reconnect the first 6 clients again", function() {
						return [0, 1, 2, 3, 4, 5].map((i) =>
							this.clients[i].emit.calledOnce.should.equal(true));
					});
					
					return it("should log out that it reached the end", function() {
						return this.logger.log
							.calledWith("All clients have been told to reconnectGracefully")
							.should.equal(true);
					});
				});
			});
		});
	});
});