// Captive portal Javascript
// by Stefan Midjich @ Cygate AB
//

var debug = true;

function getUrlParameter(sParam, default_value) {
    var sPageURL = decodeURIComponent(window.location.search.substring(1)),
        sURLVariables = sPageURL.split('&'),
        sParameterName,
        i;

    for (i = 0; i < sURLVariables.length; i++) {
        sParameterName = sURLVariables[i].split('=');

        if (sParameterName[0] === sParam) {
            return sParameterName[1] === undefined ? true : sParameterName[1];
        }
    }

    return default_value;
}


// This function ensures the user gets redirect to the correct destination once
// all jobs have succeeded in the portal software.
function do_success() {
    var url = getUrlParameter('url', 'www.google.com');

    // If url does not start with http the window.location redirect
    // won't work. So prefix http to url.
    if (!url.startsWith('http')) {
        url = 'http://' + url;
    }
    //console.log('success: ' + url);
    $('#error-box').html('<p>If you\'re not automatically redirected <a href="https://www.google.com/">click here</a>.</p>');
    $('#error-box').show();
    $('#statusDiv').html('');
    $('#approveButton').prop('disabled', false);

    // Redirect user to the url paramter.
    window.location = url;
}


// Show an error to the user
function do_error(message) {
    $('#approveButton').prop('disabled', false);
    $('#statusDiv').html('');

    $('#error-box').show();
    $('#error-box').html('<p>Failed. Reload page and try again or contact support.</p> ');
    if (message) {
        //console.log(message);
    }
}


// Poll the returned jobs and ensure they all succeed
function poll_jobs(data) {
    var promises = [];

    if (debug) {
        //console.log('Jobs data: ', data);
    }

    // Push promises into array, one for each job returned from POST /approve
    for (var job in data) {
        var job_id = data[job].id;
        var api_url = '/job/' + job_id;

        if (debug) {
            //console.log('Processing job: ', data[job]);
        }

        // Each promise will poll the job ID for status
        promises.push(new Promise(function(resolve, reject) {
            var plugin_timeout = 30;
            var maxRun = plugin_timeout / 2;
            var timesRun = 0;

            // Timer function that polls the API for job results
            var pollJob = function() {
                ajaxReq = $.get(api_url);
                ajaxReq.done(function(getResponse) {
                    // Verify job data
                    var job_result = getResponse;

                    if (debug) {
                        //console.log(`Job result: ${job_result}`);
                    }

                    //console.log(job_result);
                    if (job_result.is_finished) {
                        console.log(`Resolved job: ${job_result.id}`);
                        resolve(job_result);
                        clearTimeout(timer);
                        return (true);
                    }

                    if (job_result.is_failed && job_result.meta.mandatory) {
                        console.log(`Job failed: ${job_result.id}`);
                        reject(job_result);
                        clearTimeout(timer);
                        return (false);
                    }

                    if (job_result.is_failed && !job_result.meta.mandatory) {
                        console.log(`Resolved non-mandatory failed job: ${job_result.id}`);
                        resolve(job_result);
                        clearTimeout(timer);
                        return (true);
                    }
                });

                ajaxReq.fail(function(XMLHttpRequest, textStatus, errorThrown) {
                    reject(XMLHttpRequest.responseText);
                });

                // Set timeout recursively until a certain threshold is reached
                if (++timesRun == maxRun) {
                    clearTimeout(timer);
                    reject("Job polling timed out");
                    return;
                } else {
                    timer = setTimeout(pollJob, 2000);
                }
            };

            // Here I just want the pollJob function to run immediately
            var timer = setTimeout(pollJob, 1000);
        }));
    }

    // Run .all() on promises array until all promises resolve
    // This is resolve() above.
    Promise.all(promises).then(function(result) {
        var success = true;

        console.log(result);

        if (success === true) {
            // This timeout might be important if device wifi prompts seem to
            // hang on the portal without redirecting on their own.
            setTimeout(do_success, 2000);
        }

        // This is reject() above.
    }, function(reason) {
        do_error(reason);
    });
}


// Submit the form
$('#approveForm').submit(function(event) {
    var api_url = '/approve';
    event.preventDefault();
    $('#error-box').hide();
    $('#approveButton').prop('disabled', true);
    $('#statusDiv').html('<img src="/static/images/radio.svg" alt="Loading, please wait..." />');

    if ($('#approveCheckbox').is(':checked')) {

        var ajaxReq = $.post(api_url);
        ajaxReq.done(poll_jobs);

        ajaxReq.fail(function(XMLHttpRequest, textStatus, errorThrown) {
            do_error(XMLHttpRequest.responseText);
        });
    }

});