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var should = require('should');

var SeqQueue = require('../lib/seq-queue');

var timeout = 1000;

describe('seq-queue', function() {

describe('#createQueue', function() {

it('should return a seq-queue instance with init properties', function() {

var queue = SeqQueue.createQueue(timeout);

should.exist(queue);

queue.should.have.property('timeout', timeout);

queue.should.have.property('status', SeqQueue.IDLE);

});

});

describe('#push' , function() {

it('should change the queue status from idle to busy and invoke the task at once when task finish when queue idle', function(done) {

var queue = SeqQueue.createQueue(timeout);

queue.should.have.property('status', SeqQueue.IDLE);

queue.push(function(task) {

should.exist(task);

task.done();

queue.should.have.property('status', SeqQueue.IDLE);

done();

});

queue.should.have.property('status', SeqQueue.BUSY);

});

it('should keep the status busy and keep the new task wait until the former tasks finish when queue busy', function(done) {

var queue = SeqQueue.createQueue(timeout);

var formerTaskFinished = false;

//add first task

queue.push(function(task) {

formerTaskFinished = true;

task.done();

});

queue.should.have.property('status', SeqQueue.BUSY);

//add second task

queue.push(function(task) {

formerTaskFinished.should.be.true;

queue.should.have.property('status', SeqQueue.BUSY);

task.done();

queue.should.have.property('status', SeqQueue.IDLE);

done();

});

queue.should.have.property('status', SeqQueue.BUSY);

});

it('should ok if the task call done() directly', function(done) {

var queue = SeqQueue.createQueue();

var taskCount = 0;

queue.push(function(task) {

taskCount++;

task.done();

});

queue.push(function(task) {

taskCount++;

task.done();

});

setTimeout(function() {

taskCount.should.equal(2);

done();

}, 500);

});

});

describe('#close', function() {

it('should not accept new request but should execute the rest task in queue when close gracefully', function(done) {

var queue = SeqQueue.createQueue(timeout);

var closedEventCount = 0;

var drainedEventCount = 0;

queue.on('closed', function() {

closedEventCount++;

});

queue.on('drained', function() {

drainedEventCount++;

});

var executedTaskCount = 0;

queue.push(function(task) {

executedTaskCount++;

task.done();

}).should.be.true;

queue.close(false);

queue.should.have.property('status', SeqQueue.CLOSED);

queue.push(function(task) {

// never should be executed

executedTaskCount++;

task.done();

}).should.be.false;

// wait all task finished

setTimeout(function() {

executedTaskCount.should.equal(1);

closedEventCount.should.equal(1);

drainedEventCount.should.equal(1);

done();

}, 1000);

});

it('should not execute any task and emit a drained event when close forcefully', function(done) {

var queue = SeqQueue.createQueue(timeout);

var drainedEventCount = 0;

queue.on('drained', function() {

drainedEventCount++;

});

var executedTaskCount = 0;

queue.push(function(task) {

//never should be executed

executedTaskCount++;

task.done();

}).should.be.true;

queue.close(true);

queue.should.have.property('status', SeqQueue.DRAINED);

// wait all task finished

setTimeout(function() {

executedTaskCount.should.equal(0);

drainedEventCount.should.equal(1);

done();

}, 1000);

});

});

describe('#timeout', function() {

it('should emit timeout event and execute the next task when a task timeout by default', function(done) {

var queue = SeqQueue.createQueue();

var executedTaskCount = 0;

var timeoutCount = 0;

var onTimeoutCount = 0;

//add timeout listener

queue.on('timeout', function(task) {

task.should.be.a('object');

task.fn.should.be.a('function');

timeoutCount++;

});

queue.push(function(task) {

executedTaskCount++;

//no task.done() invoke to cause a timeout

}, function() {

onTimeoutCount++;

}).should.be.true;

queue.push(function(task) {

executedTaskCount++;

task.done();

}).should.be.true;

setTimeout(function() {

//wait all task finish

executedTaskCount.should.be.equal(2);

timeoutCount.should.be.equal(1);

onTimeoutCount.should.be.equal(1);

done();

}, 4000); //default timeout is 3s

});

it('should return false when invoke task.done() if task has already timeout', function(done) {

var queue = SeqQueue.createQueue();

var executedTaskCount = 0;

var timeoutCount = 0;

var timeout = 1000;

//add timeout listener

queue.on('timeout', function(task) {

task.should.be.a('object');

task.fn.should.be.a('function');

timeoutCount++;

});

queue.push(function(task) {

executedTaskCount++;

task.done().should.be.true;

}).should.be.true;

queue.push(function(task) {

//sleep to make a timeout

setTimeout(function() {

executedTaskCount++;

task.done().should.be.false;

}, timeout + 1000);

}, null, timeout).should.be.true;

setTimeout(function() {

//wait all task finish

executedTaskCount.should.be.equal(2);

timeoutCount.should.be.equal(1);

done();

}, 4000);

});

it('should never timeout after close forcefully', function(done) {

var queue = SeqQueue.createQueue(timeout);

var timeoutCount = 0;

//add timeout listener

queue.on('timeout', function(task) {

//should never enter here

timeoutCount++;

});

queue.push(function(task) {

//no task.done() invoke to cause a timeout

}).should.be.true;

queue.close(true);

setTimeout(function() {

//wait all task finish

timeoutCount.should.be.equal(0);

done();

}, timeout * 2);

});

it('should use the global timeout value by default', function(done) {

var globalTimeout = timeout + 100;

var queue = SeqQueue.createQueue(globalTimeout);

//add timeout listener

queue.on('timeout', function(task) {

(Date.now() - start).should.not.be.below(globalTimeout);

done();

});

queue.push(function(task) {

//no task.done() invoke to cause a timeout

}).should.be.true;

var start = Date.now();

});

it('should use the timeout value in #push if it was assigned', function(done) {

var localTimeout = timeout / 2;

var queue = SeqQueue.createQueue(timeout);

//add timeout listener

queue.on('timeout', function(task) {

var diff = Date.now() - start;

diff.should.not.be.below(localTimeout);

diff.should.not.be.above(timeout);

done();

});

queue.push(function(task) {

//no task.done() invoke to cause a timeout

}, null, localTimeout).should.be.true;

var start = Date.now();

});

});

describe('#error', function() {

it('should emit an error event and invoke next task when a task throws an event', function(done) {

var queue = SeqQueue.createQueue();

var errorCount = 0;

var taskCount = 0;

//add timeout listener

queue.on('error', function(err, task) {

errorCount++;

should.exist(err);

should.exist(task);

});

queue.push(function(task) {

taskCount++;

throw new Error('some error');

}).should.be.true;

queue.push(function(task) {

taskCount++;

task.done();

});

setTimeout(function() {

taskCount.should.equal(2);

errorCount.should.equal(1);

done();

}, 500);

});

it('should be ok when task throw a error after done was invoked', function(done) {

var queue = SeqQueue.createQueue();

var errorCount = 0;

var taskCount = 0;

//add timeout listener

queue.on('error', function(err, task) {

errorCount++;

should.exist(err);

should.exist(task);

});

queue.push(function(task) {

taskCount++;

task.done();

throw new Error('some error');

}).should.be.true;

queue.push(function(task) {

taskCount++;

task.done();

});

setTimeout(function() {

taskCount.should.equal(2);

errorCount.should.equal(1);

done();

}, 500);

});

});

});