/* base.js
   This is the base JS file to render the user interfaces of kratos and provide
   the end user with flows for login, recovery etc. 

   check_flow_*():
   These functions check the status of the flow and based on the status do some
   action to get a better experience for the end user. Usually this is a
   redirect based on the state

   flow_*():
   execute / render all UI elements in a flow. Kratos expects you to work on
   to query kratos which provides you with the UI elements needed to be
   rendered. This querying and rendering is done exectly by those function.
   Based on what kratos provides or the state of the flow, elements are maybe
   hidden or shown

*/


// Check if an auth flow is configured and redirect to auth page in that
// case.
function check_flow_auth() {
    var state = Cookies.get('flow_state');
    var url = Cookies.get('auth_url');

    if (state == 'auth') {
        Cookies.set('flow_state','');
        window.location.href = url;
    }
}

// Check if there if the flow is expired, if so, reset the cookie
function check_flow_expired() {
    var state = Cookies.get('flow_state');

    if (state == 'flow_expired') {
        Cookies.set('flow_state','');
        $("#contentFlowExpired").show();
    }
}



// The script executed on login flows
function flow_login() {

    var flow = $.urlParam('flow');
    var uri = api_url + 'self-service/login/flows?id=' + flow;

    // Query the Kratos backend to know what fields to render for the
    // current flow
    $.ajax({
        type: "GET",
        url: uri,
        success: function(data) {

            // Render login form (group: password)
            var html = render_form(data, 'password');
            $("#contentLogin").html(html);

        },
        complete: function(obj) {

            // If we get a 410, the flow is expired, need to refresh the flow
            if (obj.status == 410) {
                Cookies.set('flow_state','flow_expired');
                // If we call the page without arguments, we get a new flow
                window.location.href = 'login';
            }
        }
    });
}

// This is called after a POST on settings. It tells if the save was 
// successful and display / handles based on that outcome
function flow_settings_validate() {

    var flow = $.urlParam('flow');
    var uri = api_url + 'self-service/settings/flows?id=' + flow;

    $.ajax( {
        type: "GET",
        url: uri,
        success: function(data) {

            // We had success. We save that fact in our flow_state
            // cookie and regenerate a new flow
            if (data.state == 'success') {
                Cookies.set('flow_state', 'settings_saved');

                // Redirect to generate new flow ID
                window.location.href = 'settings';
            }
            else {

                 // There was an error, Kratos does not specify what is
                 // wrong. So we just show the general error message and
                 // let the user figure it out. We can re-use the flow-id
                 $("#contentProfileSaveFailed").show();
            }
        }
    });
}


// Render the settings flow, this is where users can change their personal
// settings, like name and password. The form contents are defined by Kratos
function flow_settings() {

    // Get the details from the current flow from kratos
    var flow = $.urlParam('flow');
    var uri = api_url + 'self-service/settings/flows?id=' + flow;
    $.ajax({
        type: "GET",
        url: uri,
        success: function(data) {

            var state = Cookies.get('flow_state')

            // If we have confirmation the settings are saved, show the
            // notification
            if (state == 'settings_saved') {
                $("#contentProfileSaved").show();
                Cookies.set('flow_state', 'settings');
            }

            // Hide prfile section if we are in recovery state
            // so the user is not confused by other fields. The user
            // probably want to setup a password only first.
            if (state == 'recovery') {
                $("#contentProfile").hide();
            }


            // Render the password & profile form based on the fields we got
            // from the API
            var html = render_form(data, 'password');
            $("#contentPassword").html(html);

            html = render_form(data, 'profile');
            $("#contentProfile").html(html);

            // If the submit button is hit, execute the POST with Ajax. 
            $("#formpassword").submit(function(e) {

                // avoid to execute the actual submit of the form.
                e.preventDefault(); 

                var form = $(this);
                var url = form.attr('action');

                $.ajax({
                    type: "POST",
                    url: url,
                    data: form.serialize(), 
                    complete: function(obj) {
                        // Validate the settings
                        flow_settings_validate();
                    },
                });
            });



        },
        complete: function(obj) {

            // If we get a 410, the flow is expired, need to refresh the flow
            if (obj.status == 410) {
                Cookies.set('flow_state','flow_expired');
                window.location.href = 'settings';
            }

        }
    });

}

function flow_recover() {
    var flow = $.urlParam('flow');
    var uri = api_url + 'self-service/recovery/flows?id=' + flow;

    $.ajax( {
        type: "GET",
        url: uri,
        success: function(data) {

            // Render the recover form, method 'link'
            var html = render_form(data, 'link');
            $("#contentRecover").html(html);

            // Do form post as an AJAX call
            $("#formlink").submit(function(e) {

                // avoid to execute the actual submit of the form.
                e.preventDefault(); 

                var form = $(this);
                var url = form.attr('action');

                // keep stat we are in recovery
                Cookies.set('flow_state', 'recovery');
                $.ajax({
                    type: "POST",
                    url: url,
                    data: form.serialize(), // serializes the form's elements.
                    success: function(data)
                    {

                        // Show the request is sent out
                        $("#contentRecover").hide();
                        $("#contentRecoverRequested").show();
                    }
                });
            });


        },
        complete: function(obj) {

            // If we get a 410, the flow is expired, need to refresh the flow
            if (obj.status == 410) {
                Cookies.set('flow_state','flow_expired');
                window.location.href = 'recovery';

            }
        }
    });
}

// Based on Kratos UI data and a group name, get the full form for that group.
// kratos groups elements which belongs together in a group and should be posted 
// at once. The elements in the default group should be part of all other
// groups.
//
// data: data object as returned form the API
// group: group to render.
function render_form(data, group) { 

    // Create form
    var action = data.ui.action;
    var method = data.ui.method;
    var form = "<form id='form"+group+"' method='"+method+"' action='"+action+"'>";

    for (const node of data.ui.nodes) {

        var name = node.attributes.name;
        var type = node.attributes.type;
        var value = node.attributes.value;

        if (node.group == 'default' || node.group == group) {
            var elm = getFormElement(type, name, value);
            form += elm;
        }
    }
    form += "</form>";
    return form;

}

// Return form element based on name, including help text (sub), placeholder etc.
// Kratos give us form names and types and specifies what to render. However
// it does not provide labels or translations. This function returns a HTML
// form element based on the fields provided by Kratos with proper names and 
// labels
// type: input type, usual "input", "hidden" or "submit". But bootstrap types
//                   like "email" are also supported
// name: name of the field. Used when posting data
// value: If there is already a value known, show it
function getFormElement(type, name, value) {

    if (value == undefined) {
            value = '';
    }
    if (name == 'email' || name == 'traits.email') {
        return getFormInput(
                'email',
                name,
                value,
                'E-mail address',
                'Please enter your e-mail address here',
                'Please provide your e-mail address. We will send a recovery ' +
                'link to that e-mail address.',
                );
    }

    if (name == 'traits.username') {
        return getFormInput(
                'name',
                name,
                value,
                'Username',
                'Please provide an username',
                null
                );
    }

    if (name == 'traits.name') {
        return getFormInput(
                'name',
                name,
                value,
                'Full name',
                'Please provide your full name',
                null
                );
    }


    if (name == 'password_identifier') {
        return getFormInput(
                'email',
                name,
                value,
                'E-mail address',
                'Please provide your e-mail address to login',
                null
                );
    }

    if (name == 'password') {
        return getFormInput(
                'password',
                name,
                value,
                'Password',
                'Please provide your password',
                null
                );
    }


    if (type == 'hidden' || name == 'traits.uuid') {

        return `
            <input type="hidden" class="form-control" id="`+name+`"
            name="`+name+`" value='`+value+`'>`;
    }

    if (type == 'submit') {

        return `<div class="form-group">
            <input type="hidden" name="`+name+`" value="`+value+`">
             <button type="submit" class="btn btn-primary">Go!</button>
            </div>`;
    }


    return getFormInput('input', name, value, name, null,null);


}

// Usually called by getFormElement, generic function to generate an
// input box.
// param type: type of input, like 'input', 'email', 'password'
// param name: name of form field, used when posting the form
// param value: preset value of the field
// param label: Label to display above field
// param placeHolder: Label to display in field if empty
// param help: Additional help text, displayed below the field in small font
function getFormInput(type, name, value, label, placeHolder, help) {

    // Id field for help element
    var nameHelp = name + "Help";

    var element = '<div class="form-group">';
    element += '<label for="'+name+'">'+label+'</label>';
    element += '<input type="'+type+'" class="form-control" id="'+name+'" name="'+name+'" ';

    // If we are a password field, add a eye icon to reveal password
    if (value) {
        element += 'value="'+value+'" ';
    }
    if (help) {
        element += 'aria-describedby="' + nameHelp +'" ';
    }
    if (placeHolder) {
        element += 'placeholder="'+placeHolder+'" ';
    }
    element += ">";

    if (help) {
        element +=
        `<small id="`+nameHelp+`" class="form-text text-muted">` + help + `
        </small>`;
    }

    element += '</div>';

    return element;
}



// $.urlParam get parameters from the URI. Example: id =  $.urlParam('id');
$.urlParam = function(name) {
    var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
    if (results==null) {
        return null;
    }
    return decodeURI(results[1]) || 0;
};