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(function () {

    // Has the user previously consented, establish our

    // initial state

    let selected = [];

    let existingConsent = '';

    // The presence of a 'cookieConsent' local storage item indicates

    // that previous consent has been set. If the value is empty, then

    // no consent to non-essential cookies was given

    const hasStoredConsent = localStorage.getItem('cookieConsent');

    getExistingConsent();

    // The consent bar may not be in the DOM if it is not being used

    const consentBar = $('#cookieConsentBar');

    if (!consentBar) {

        return;

    }

    if (hasStoredConsent === null) {

        showConsentBar();

    }

    addButtonHandlers();

    // When the modal is opened, populate our state based on currently

    // selected values

    $('#cookieConsentModal').on('shown.bs.modal', function () {

        initialiseSelected();

    });

    // Initialise existing consent based on local storage

    function getExistingConsent() {

        existingConsent = localStorage.getItem('cookieConsent') ?

            localStorage.getItem('cookieConsent') :

            [];

    }

    function showConsentBar() {

        const consentBar = $('#cookieConsentBar');

        consentBar.attr('aria-hidden', 'false');

        consentBar.show();

    }

    function hideConsentBar() {

        const consentBar = $('#cookieConsentBar');

        consentBar.attr('aria-hidden', 'true');

        consentBar.hide();

    }

    // Hides the appropriate consent container, depending on what

    // is currently visible

    function hideContainer() {

        if ($('#cookieConsentModal').hasClass('in')) {

            $('#cookieConsentModal').modal('hide');

        } else {

            hideConsentBar();

        }

    }

    // Initialise our state of selected item and enable/disable

    // the "Accept selected" button appropriately

    function initialiseSelected() {

        selected = [];

        $('.consentCheckbox').each(function () {

            const val = $(this).val();

            if (existingConsent.indexOf(val) > -1 ) {

                $(this).prop('checked', true);

                selected.push(val);

            } else {

                $(this).prop('checked', false);

            }

        });

        enableDisableSelectedButton();

    }

    // Maintain our state of selected items and enable/disable

    // the "Accept selected" button appropriately

    function maintainSelected() {

        selected = [];

        $('.consentCheckbox:checked').each(function () {

            selected.push($(this).val());

        });

        enableDisableSelectedButton();

    }

    // Set the enabled / disabled state of the

    // "Accept selected button based on the checkbox

    // states

    function enableDisableSelectedButton() {

        $('#consentAcceptSelected').prop(

            'disabled',

            selected.length === 0

        );

    }

    function runConsentedCode() {

        getExistingConsent();

        $('.consentCode').each(function () {

            // The user has explicitly consented to this code, or the

            // code doesn't require consent in the staff view

            if (

                existingConsent.indexOf($(this).data('consent-id')) > -1 ||

                !$(this).data('requires-consent')

            ) {

                const code = atob($(this).data('consent-code'));

                const func = Function(code);

                func();

            }

        });

    }

    function addButtonHandlers() {

        // "Accept all" handler

        $('.consentAcceptAll').on('click', function(e) {

            e.preventDefault();

            let toSave = [];

            $('.consentCheckbox').each(function () {

                const val = $(this).val();

                toSave.push(val);

            });

            localStorage.setItem('cookieConsent', toSave);

            hideContainer();

            runConsentedCode();

        });

        // "Accept essential" handler

        $('.consentAcceptEssential').on('click', function(e) {

            e.preventDefault();

            localStorage.setItem('cookieConsent', []);

            hideContainer();

        });

        // "Accept selected" handler

        $('#consentAcceptSelected').on('click', function(e) {

            e.preventDefault();

            const toSave = selected.length > 0 ? selected : [];

            localStorage.setItem('cookieConsent', toSave);

            hideContainer();

            runConsentedCode();

        });

        // "More information" handler

        $('#consentMoreInfo').on(

            'click',

            function (e) {

                e.preventDefault();

                hideConsentBar();

                // Ensure we're up to date with the existing consent

                getExistingConsent();

                // Prevent the modal from being closed with anything

                // but the buttons

                $('#cookieConsentModal')

                    .modal({

                        backdrop: 'static',

                        keyboard: false,

                        focus: true,

                        show: true

                    });

            }

        );

        $('.consentCheckbox').on('click', function () {

            maintainSelected();

        });

    }

    // On page load, run any code that has been given consent

    runConsentedCode();

})();