define([
    'jquery',
    'underscore',
    'backbone',
    'edx-ui-toolkit/js/utils/spec-helpers/ajax-helpers',
    'common/js/spec_helpers/template_helpers',
    'js/verify_student/views/make_payment_step_view'
],
    function($, _, Backbone, AjaxHelpers, TemplateHelpers, MakePaymentStepView) {
        'use strict';

        var checkPaymentButtons,
            expectPaymentSubmitted,
            goToPayment,
            expectPaymentDisabledBecauseInactive,
            expectPaymentButtonEnabled,
            expectPriceSelected,
            createView,
            SERVER_ERROR_MSG = 'An error occurred!';

        describe('edx.verify_student.MakePaymentStepView', function() {
            var STEP_DATA = {
                minPrice: '12',
                currency: 'usd',
                processors: ['test-payment-processor'],
                courseKey: 'edx/test/test',
                courseModeSlug: 'verified',
                isABTesting: true
            };

            createView = function(stepDataOverrides) {
                var view = new MakePaymentStepView({
                    el: $('#current-step-container'),
                    stepData: _.extend(_.clone(STEP_DATA), stepDataOverrides),
                    errorModel: new (Backbone.Model.extend({}))()
                }).render();

                // Stub the payment form submission
                spyOn(view, 'submitForm').and.callFake(function() {});
                return view;
            };

            expectPriceSelected = function(price) {
                var $sel = $('input[name="contribution"]');

                // check that contribution value is same as price given
                expect($sel.length).toEqual(1);
                expect($sel.val()).toEqual(price);
            };

            expectPaymentButtonEnabled = function(isEnabled) {
                var $el = $('.payment-button'),
                    appearsDisabled = $el.hasClass('is-disabled'),
                    isDisabled = $el.prop('disabled');

                expect(appearsDisabled).not.toEqual(isEnabled);
                expect(isDisabled).not.toEqual(isEnabled);
            };

            expectPaymentDisabledBecauseInactive = function() {
                var $payButton = $('.payment-button');

                // Payment button should be hidden
                expect($payButton.length).toEqual(0);
            };


            goToPayment = function(requests, kwargs) {
                var params = {
                    contribution: kwargs.amount || '',
                    course_id: kwargs.courseId || '',
                    processor: kwargs.processor || '',
                    sku: kwargs.sku || ''
                };

                // Click the "go to payment" button
                $('.payment-button').click();

                // Verify that the request was made to the server
                AjaxHelpers.expectPostRequest(
                    requests, '/verify_student/create_order/', $.param(params)
                );

                // Simulate the server response
                if (kwargs.succeeds) {
                    // TODO put fixture responses in the right place
                    AjaxHelpers.respondWithJson(
                        requests, {payment_page_url: 'http://payment-page-url/', payment_form_data: {foo: 'bar'}}
                    );
                } else {
                    AjaxHelpers.respondWithTextError(requests, 400, SERVER_ERROR_MSG);
                }
            };

            expectPaymentSubmitted = function(view, params) {
                var form;

                expect(view.submitForm).toHaveBeenCalled();
                form = view.submitForm.calls.mostRecent().args[0];

                expect(form.serialize()).toEqual($.param(params));
                expect(form.attr('method')).toEqual('POST');
                expect(form.attr('action')).toEqual('http://payment-page-url/');
            };

            checkPaymentButtons = function(requests, buttons) {
                var $el = $('.payment-button');
                expect($el.length).toEqual(_.size(buttons));
                _.each(buttons, function(expectedText, expectedId) {
                    var $buttonEl = $('#' + expectedId),
                        request;

                    $buttonEl.removeAttr('disabled');
                    expect($buttonEl.length).toEqual(1);
                    expect($buttonEl[0]).toHaveClass('payment-button');
                    expect($buttonEl[0]).toHaveText(expectedText);
                    expect($buttonEl[0]).toHaveClass('action-primary-blue');

                    $buttonEl[0].click();
                    expect($buttonEl[0]).toHaveClass('is-selected');
                    expectPaymentButtonEnabled(false);
                    request = AjaxHelpers.currentRequest(requests);
                    expect(request.requestBody.split('&')).toContain('processor=' + expectedId);
                    AjaxHelpers.respondWithJson(requests, {});
                });
            };

            beforeEach(function() {
                window.analytics = jasmine.createSpyObj('analytics', ['track', 'page', 'trackLink']);

                setFixtures('<div id="current-step-container"></div>');
                TemplateHelpers.installTemplate('templates/verify_student/make_payment_step_ab_testing');
            });

            it('A/B Testing: check Initialize method with AB testing enable ', function() {
                var view = createView();
                expect(view.templateName).toEqual('make_payment_step_ab_testing');
                expect(view.btnClass).toEqual('action-primary-blue');
            });

            it('shows users only minimum price', function() {
                var view = createView(),
                    requests = AjaxHelpers.requests(this);

                expectPriceSelected(STEP_DATA.minPrice);
                expectPaymentButtonEnabled(true);
                goToPayment(requests, {
                    amount: STEP_DATA.minPrice,
                    courseId: STEP_DATA.courseKey,
                    processor: STEP_DATA.processors[0],
                    succeeds: true
                });
                expectPaymentSubmitted(view, {foo: 'bar'});
            });

            it('A/B Testing: provides working payment buttons for a single processor', function() {
                createView({processors: ['cybersource']});
                checkPaymentButtons(AjaxHelpers.requests(this), {cybersource: 'Checkout'});
            });

            it('A/B Testing: provides working payment buttons for multiple processors', function() {
                createView({processors: ['cybersource', 'paypal', 'other']});
                checkPaymentButtons(AjaxHelpers.requests(this), {
                    cybersource: 'Checkout',
                    paypal: 'Checkout with PayPal',
                    other: 'Checkout with other'
                });
            });

            it('A/B Testing: by default minimum price is selected if no suggested prices are given', function() {
                var view = createView(),
                    requests = AjaxHelpers.requests(this);

                expectPriceSelected(STEP_DATA.minPrice);
                expectPaymentButtonEnabled(true);

                goToPayment(requests, {
                    amount: STEP_DATA.minPrice,
                    courseId: STEP_DATA.courseKey,
                    processor: STEP_DATA.processors[0],
                    succeeds: true
                });
                expectPaymentSubmitted(view, {foo: 'bar'});
            });

            it('A/B Testing: min price is always selected even if contribution amount is provided', function() {
                // Pre-select a price NOT in the suggestions
                createView({
                    contributionAmount: '99.99'
                });

                // Expect that the price is filled in
                expectPriceSelected(STEP_DATA.minPrice);
            });

            it('A/B Testing: disables payment for inactive users', function() {
                createView({isActive: false});
                expectPaymentDisabledBecauseInactive();
            });

            it('A/B Testing: displays an error if the order could not be created', function() {
                var requests = AjaxHelpers.requests(this),
                    view = createView();

                goToPayment(requests, {
                    amount: STEP_DATA.minPrice,
                    courseId: STEP_DATA.courseKey,
                    processor: STEP_DATA.processors[0],
                    succeeds: false
                });

                // Expect that an error is displayed
                expect(view.errorModel.get('shown')).toBe(true);
                expect(view.errorModel.get('errorTitle')).toEqual('Could not submit order');
                expect(view.errorModel.get('errorMsg')).toEqual(SERVER_ERROR_MSG);

                // Expect that the payment button is re-enabled
                expectPaymentButtonEnabled(true);
            });
        });
    }
);
