import createEventedElement from '../../src/common/events';

let Events;
beforeEach(function() {
    Events = createEventedElement();
});
describe("subscribe", function() {
    it("should call one callback for a single event", function() {
        var callbackA = sinon.stub(),
            callbackB = sinon.stub();

        Events.subscribe("test", callbackA);
        Events.subscribe("test", callbackB);
        Events.publish("test");

        expect(callbackA.calledOnce).to.be.equal(true);
        expect(callbackB.calledOnce).to.be.equal(true);
    });

    it("should call one callback twice if published twice", function() {
        var callback = sinon.stub();

        Events.subscribe("test", callback);

        Events.publish("test");
        Events.publish("test");

        expect(callback.calledTwice).to.be.equal(true);
    });

    it("should call the callback asynchronuously", function(done) {
        var test = {
            callback: function() {}
        };

        sinon.stub(test, "callback", function() {
            expect(test.callback.calledOnce).to.equal(true);
            done();
        });
        Events.subscribe("test", test.callback, true);
        Events.publish("test");
        expect(test.callback.called).to.equal(false);
    });
});

describe("once", function() {
    it("should call the callback once, even when published twice", function() {
        var callbackA = sinon.stub(),
            callbackB = sinon.stub();

        Events.once("test", callbackA);
        Events.subscribe("test", callbackB);

        Events.publish("test");
        Events.publish("test");

        expect(callbackA.calledOnce).to.be.equal(true);
        expect(callbackB.calledTwice).to.be.equal(true);
    });
});

describe("unsubscribe", function() {
    it("should unsubscribe all callbacks from a single event", function() {
        var callbackA = sinon.stub(),
            callbackB = sinon.stub(),
            callbackC = sinon.stub();

        Events.subscribe("test", callbackA);
        Events.subscribe("test", callbackB);
        Events.subscribe("testC", callbackC);

        Events.publish("test");

        expect(callbackC.called).to.be.equal(false);
        expect(callbackA.calledOnce).to.be.equal(true);
        expect(callbackB.calledOnce).to.be.equal(true);

        Events.publish("testC");

        expect(callbackC.calledOnce).to.be.equal(true);
        expect(callbackA.calledOnce).to.be.equal(true);
        expect(callbackB.calledOnce).to.be.equal(true);

        Events.unsubscribe("test");
        Events.publish("test");

        expect(callbackC.calledOnce).to.be.equal(true);
        expect(callbackA.calledOnce).to.be.equal(true);
        expect(callbackB.calledOnce).to.be.equal(true);
    });

    it("should unsubscribe a single callback from a single event", function() {
        var callbackA = sinon.stub(),
            callbackB = sinon.stub();

        Events.subscribe("test", callbackA);
        Events.subscribe("test", callbackB);

        Events.publish("test");

        expect(callbackA.calledOnce).to.be.equal(true);
        expect(callbackB.calledOnce).to.be.equal(true);


        Events.unsubscribe("test", callbackB);
        Events.publish("test");

        expect(callbackA.calledTwice).to.be.equal(true);
        expect(callbackB.calledOnce).to.be.equal(true);
    });
});