var edx = edx || {};

(function($, _, gettext) {
    'use strict';

    edx.student = edx.student || {};
    edx.student.account = edx.student.account || {};

    edx.student.account.LoginView = edx.student.account.FormView.extend({
        el: '#login-form',

        tpl: '#login-tpl',

        events: {
            'click .js-login': 'submitForm',
            'click .forgot-password': 'forgotPassword',
            'click .login-provider': 'thirdPartyAuth'
        },

        formType: 'login',

        requiredStr: '',

        submitButton: '.js-login',

        preRender: function( data ) {
            this.providers = data.thirdPartyAuth.providers || [];
            this.currentProvider = data.thirdPartyAuth.currentProvider || '';
            this.platformName = data.platformName;
            this.resetModel = data.resetModel;

            this.listenTo( this.model, 'sync', this.saveSuccess );
            this.listenTo( this.resetModel, 'sync', this.resetEmail );
        },

        render: function( html ) {
            var fields = html || '';

            $(this.el).html( _.template( this.tpl, {
                // We pass the context object to the template so that
                // we can perform variable interpolation using sprintf
                context: {
                    fields: fields,
                    currentProvider: this.currentProvider,
                    providers: this.providers,
                    platformName: this.platformName
                }
            }));

            this.postRender();

            return this;
        },

        postRender: function() {
            this.$container = $(this.el);

            this.$form = this.$container.find('form');
            this.$errors = this.$container.find('.submission-error');
            this.$resetSuccess = this.$container.find('.js-reset-success');
            this.$authError = this.$container.find('.already-authenticated-msg');
            this.$submitButton = this.$container.find(this.submitButton);

            /* If we're already authenticated with a third-party
             * provider, try logging in.  The easiest way to do this
             * is to simply submit the form.
             */
            if (this.currentProvider) {
                this.model.save();
            }
        },

        forgotPassword: function( event ) {
            event.preventDefault();

            this.trigger('password-help');
            this.element.hide( this.$resetSuccess );
        },

        postFormSubmission: function() {
            this.element.hide( this.$resetSuccess );
        },

        resetEmail: function() {
            this.element.hide( this.$errors );
            this.element.show( this.$resetSuccess );
        },

        thirdPartyAuth: function( event ) {
            var providerUrl = $(event.target).data('provider-url') || '';

            if (providerUrl) {
                window.location.href = providerUrl;
            }
        },

        saveSuccess: function() {
            this.trigger('auth-complete');
            this.element.hide( this.$resetSuccess );
        },

        saveError: function( error ) {
            this.errors = ['<li>' + error.responseText + '</li>'];
            this.setErrors();
            this.element.hide( this.$resetSuccess );

            /* If we've gotten a 403 error, it means that we've successfully
             * authenticated with a third-party provider, but we haven't
             * linked the account to an EdX account.  In this case,
             * we need to prompt the user to enter a little more information
             * to complete the registration process.
             */
            if ( error.status === 403 &&
                 error.responseText === 'third-party-auth' &&
                 this.currentProvider ) {
                this.element.show( this.$authError );
                this.element.hide( this.$errors );
            } else {
                this.element.hide( this.$authError );
                this.element.show( this.$errors );
            }
            this.toggleDisableButton(false);
        }
    });
})(jQuery, _, gettext);
