/**
 * @NApiVersion 2.x
 * @NScriptType Suitelet
 */
define(['N/ui/serverWidget', 'N/record', 'N/redirect', 'N/search', 'N/runtime'], 
function(serverWidget, record, redirect, search, runtime) {

    function onRequest(context) {
        if (context.request.method === 'GET') {
            var form = serverWidget.createForm({ title: 'Email Preferences' });

            // Adding field group
            form.addFieldGroup({
                id: 'main_info',
                label: 'Main Information'
            });

            form.addFieldGroup({
                id: 'preferences',
                label: 'Preferences'
            });

            // Email field
            var emailField = form.addField({
                id: 'custpage_email',
                type: serverWidget.FieldType.EMAIL,
                label: 'Email Address',
                container: 'main_info'
            });
            emailField.isMandatory = true;

            // Preferred Manufacturers field
            var manufacturerField = form.addField({
                id: 'custpage_preferred_manufacturer',
                type: serverWidget.FieldType.MULTISELECT,
                label: 'Preferred Manufacturers',
                source: 'customlist1', // custom list id
                container: 'preferences'
            });
            manufacturerField.isMandatory = true;

            // Email Frequency field
            var frequencyField = form.addField({
                id: 'custpage_email_frequency',
                type: serverWidget.FieldType.SELECT,
                label: 'Email Frequency',
                source: 'customlist_daily_inventory_list_option', // custom list id
                container: 'preferences'
            });
            frequencyField.isMandatory = true;

            form.addSubmitButton({ label: 'Submit' });

            context.response.writePage(form);

        } else {
            var email = context.request.parameters.custpage_email;
            var preferredManufacturers = context.request.parameters.custpage_preferred_manufacturer;
            var emailFrequency = context.request.parameters.custpage_email_frequency;

            // Parse the preferred manufacturers into an array
            var preferredManufacturersArray = preferredManufacturers ? preferredManufacturers.split(',') : [];

            // Search for the contact with the given email address
            var contactSearch = search.create({
                type: search.Type.CONTACT,
                filters: [
                    ['email', <http://search.Operator.IS|search.Operator.IS>, email]
                ],
                columns: ['internalid']
            });

            var contactId;
            contactSearch.run().each(function(result) {
                contactId = result.getValue('internalid');
                return false; // Exit loop after finding the first match
            });

            if (contactId) {
                // Load and update the contact record
                var contactRecord = record.load({
                    type: record.Type.CONTACT,
                    id: contactId
                });

                contactRecord.setValue({
                    fieldId: 'custentity_preferred_manufacturer_email',
                    value: preferredManufacturersArray
                });

                contactRecord.setValue({
                    fieldId: 'custentity_daily_inventory_list_email',
                    value: emailFrequency
                });

                contactRecord.save();

                context.response.write('Preferences updated successfully.');
            } else {
                context.response.write('No contact found with the provided email address.');
            }
        }
    }

    return {
        onRequest: onRequest
    };
});