(function(){
    var _global_name = "external_consent";
    var _host =  "https://google-consent.mw.dynata.com"
    var _popupWindow = null;

    function noConsent(consentType,coronaSession,callbackFn){
        var xhr = new XMLHttpRequest();
        xhr.open('POST', _host+'/no-consent');
        xhr.setRequestHeader('Content-Type', 'application/json');
        xhr.onload = function(){
            if(callbackFn){
                callbackFn()
            }
        };
        xhr.send(JSON.stringify({
            corona_session:coronaSession,
            consent_type:consentType,
        }));
    }

    function openPopup(consentType,coronaSession,callbackFn) {
        openConsentPopup({
            callbackFn:callbackFn,
            consentType:consentType,
            coronaSession:coronaSession,
            target:"_blank",
            respondentId:null,
        })
    }

    function openConsentPopup(opts){

        if((!opts.callbackFn && !opts.returnUrl) || !opts.consentType || (!opts.coronaSession && !opts.respondentId)){
            throw "consentType, (coronaSession or respondentId), (callbackFn or returnUrl) required";
            return;
        }

        if(opts.returnUrl){
            location.replace(_host+"/get-consent?respondentId="+opts.respondentId+"&consentType="+opts.consentType+"&returnUrl="+encodeURIComponent(opts.returnUrl));
            return
        }

        //if the window is already open...
        if(_popupWindow != null){
            _popupWindow.close();
        }

        //open an empty window, will will set the location to the redirect url.
        //when need todo this now so we don't get a popup blocker
        var left = (screen.width/2)-(800/2);
        var top = (screen.height/2)-(600/2);
        if(opts.target) {
            _popupWindow = window.open(_host + '/start.html', opts.target);
        }
        else {
            _popupWindow = window.open(_host + '/start.html', "Consent", 'toolbar=no, menubar=no, copyhistory=no, scrollbars=no, width=800, height=600, top=' + top + ', left=' + left);
        }

        var xhr = new XMLHttpRequest();
        var xhrOnLoad = function(){
            if (xhr.status === 200) {
                var data = JSON.parse(xhr.responseText)

                //they already consented, just call the callback function.
                if(data.consented){
                    _popupWindow.close();
                    _popupWindow = null;
                    opts.callbackFn(data);
                    return;
                }

                //they have not consented, need to open a window and show the external consent
                var complete = false;
                _popupWindow.location = data.redirect_url;
                var callbackHandler = function receiveMessage(e) {
                    // Validate the origin
                    if (e.origin !== _host && e.origin !== 'https://google-consent.qa.mw.dynata.com') {
                        console.log("Invalid host " + e.origin)
                        return
                    }

                    complete = true ;
                    if( _popupWindow != null) {
                        _popupWindow.close();
                        _popupWindow = null;
                        opts.callbackFn(e.data);
                    }
                    window.removeEventListener('message', callbackHandler)
                };

                window.addEventListener("message",callbackHandler)

                //this will check to see if the user just closed the popup without going through the consent flow.
                var timer = setInterval(checkPopupWindowClose, 500);
                function checkPopupWindowClose() {
                    if (_popupWindow == null){
                        clearInterval(timer);
                        return;
                    }

                    if (_popupWindow.closed) {
                        if(!complete){
                            opts.callbackFn({
                                closed_window:true,
                                consented:false
                            })
                        }
                        _popupWindow = null;
                        clearInterval(timer);
                        window.removeEventListener('message', callbackHandler)
                    }
                }
            } else {
                console.error("unknown external consent status",xhr);
                _popupWindow.close();
                _popupWindow = null;
                opts.callbackFn({
                    closed_window:true,
                    consented:false
                })
            }
        }

        xhr.open('POST', _host+'/generate-consent-redirect');
        xhr.setRequestHeader('Content-Type', 'application/json');
        xhr.onload = xhrOnLoad;
        xhr.send(JSON.stringify({
            respondent_id:opts.respondentId,
            locale:opts.locale,
            corona_session:opts.coronaSession,
            consent_type:opts.consentType,
        }));
    }

    function revoke(opts){
        if(!opts.consentType || !opts.coronaSession){
            throw "consentType and coronaSession required";
            return;
        }

        let xhr = new XMLHttpRequest();

        xhr.open('POST', _host+'/revoke');
        xhr.setRequestHeader('Content-Type', 'application/json');
        xhr.onload = function(){
            if (xhr.status === 200) {
                var data = JSON.parse(xhr.responseText);
                opts.callbackFn(data);
            }
            else{
                opts.callbackFn({
                    error:xhr.response,
                    status:xhr.status
                });
            }
        };
        xhr.send(JSON.stringify({
            locale:opts.locale,
            corona_session:opts.coronaSession,
            consent_type:opts.consentType,
        }));

    }

    function status(opts){
        if(!opts.consentType || !opts.coronaSession){
            throw "consentType and coronaSession required";
            return;
        }
        let xhr = new XMLHttpRequest();

        xhr.open('POST', _host+'/status');
        xhr.setRequestHeader('Content-Type', 'application/json');
        xhr.onload = function(){
            if (xhr.status === 200) {
                var data = JSON.parse(xhr.responseText)
                opts.callbackFn(data);
            }
            else{
                console.error("unknown external consent status",xhr);
                opts.callbackFn({
                    error:xhr.response,
                    status:xhr.status
                });
            }
        };
        xhr.send(JSON.stringify({
            locale:opts.locale,
            corona_session:opts.coronaSession,
            consent_type:opts.consentType,
        }));

    }


    window[_global_name] = {
        openConsentPopup: openConsentPopup,
        openPopup: openPopup,
        noConsent: noConsent,
        revoke:revoke,
        status:status,
    }
}());