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$(document).ready(function() {

    let checkouts_count = 0;

    let current_item;

    function addResult(type, code, data) {

        let result = '';

        if (type == 'danger') {

            result += '<div class="alert alert-danger">';

        } else if (type == 'warning') {

            result += '<div class="alert alert-warning">';

        } else if (type == 'info') {

            result += '<div class="alert alert-info">';

        } else {

            result += '<div class="alert alert-success">';

        }

        if (code == 'NOT_FOUND') {

            result += _("Item '%s' not found").format(data);

        } else if (code == 'RENEW_ISSUE') {

            result += _("Item will be renewed").format(data);

        } else if (code == 'OTHER_CHARGES') {

            result += _("Your account currently has outstanding charges of '%s'").format(data);

        } else if (code == 'DEBT') {

            result += _("Your account is currently in debt by '%s'").format(data);

        } else if (code == 'ISSUED_TO_ANOTHER') {

            result += _("This item appears to be checked out to another patron, please return it to the desk");

        } else if (code == 'RESERVED' || code == 'RESERVED_WAITING') {

            result += _("This item appears to be reserved for another patron, please return it to the desk");

        } else if (code == 'TOO_MANY') {

            result += _("You have reached the maximum number of checkouts allowed on your account");

        } else if (code == 'AGE_RESTRICTION') {

            result += _("This item is age restricted");

        } else if (code == 'NO_MORE_RENEWALS') {

            result += _("Maximum renewals reached for this item");

        } else if (code == 'NOT_FOR_LOAN') {

            result += _("This item is not normally for loan, please select another or ask at the desk");

        } else if (code == 'WTHDRAWN') {

            result += _("This item is marked withdrawn, please select another or ask at the desk");

        } else if (code == 'EMPTY') {

            result += _("Please enter the barcode for the item you wish to checkout");

        } else {

            result += _("Message code '%s' with data '%s'").format(code, data);

        }

        result += '</div>';

        $('#availabilityResult').append(result);

    };

    function addCheckout(checkout) {

        // Alert that checkout was successful

        $('#checkoutResults').replaceWith('<div id="checkoutResults" class="alert alert-success">' + _("Item '%s' was checked out").format(current_item.external_id) + '</div>');

        // Cleanup input and unset readonly

        $('#checkout_barcode').val("").prop("readonly", false).focus();

        // Display checkouts table if not already visible

        $('#checkoutsTable').show();

        // Add checkout to checkouts table

        $('#checkoutsTable > tbody').append('<tr><td>' + current_item.external_id +'</td><td>'+ $date(checkout.due_date) +'</td></tr>');

        $('#checkoutsCount').html(++checkouts_count);

        // Reset to submission

        $('#checkoutConfirm').replaceWith('<button type="submit" id="checkoutSubmit" class="btn btn-primary">Submit</button>');

    };

    // On modal show, clear any prior results and set focus

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

        $('#checkoutResults').replaceWith('<div id="checkoutResults"></div>');

        $('#availabilityResult').replaceWith('<div id="availabilityResult"></div>');

        $('#checkoutsTable').hide();

        $('#checkout_barcode').val("").focus();

    });

    // On modal submit

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

        // Get item from barcode

        let external_id = $('#checkout_barcode').val();

        if ( external_id === '' ) {

            addResult('warning', 'EMPTY');

            return;

        }

        let item_id;

        let items = $.ajax({

            url: '/api/v1/public/items?external_id=' + external_id,

            dataType: 'json',

            type: 'GET'

        });

        $('#availabilityResult').replaceWith('<div id="availabilityResult"></div>');

        // Get availability of the item

        let availability = items.then(

            function(data, textStatus, jqXHR) {

                if (data.length == 1) {

                    current_item = data[0];

                    item_id = current_item.item_id;

                    return $.ajax({

                        url: '/api/v1/public/checkouts/availability?item_id=' + item_id + '&patron_id=' + logged_in_user_id,

                        type: 'GET',

                        contentType: "json"

                    });

                } else {

                    addResult('danger', 'NOT_FOUND', external_id);

                }

            },

            function(data, textStatus, jqXHR) {

                addResult('danger', 'NOT_FOUND', external_id);

                console.log('Items request failed with: ' + textStatus);

            }

        );

        let checkout = availability.then(

            function(data, textStatus, jqXHR) {

                let result;

                // blocked

                if (Object.keys(data.blockers).length >= 1) {

                    for (const key in data.blockers) {

                        if (data.blockers.hasOwnProperty(key)) {

                            addResult('danger', `${key}`, `${data.blockers[key]}`);

                            console.log(`${key}: ${data.blockers[key]}`);

                            $('#checkout_barcode').val("").prop("readonly", false).focus();

                        }

                    }

                }

                // requires confirmation

                else if (Object.keys(data.confirms).length >= 1) {

                    for (const key in data.confirms) {

                        if (data.confirms.hasOwnProperty(key)) {

                            addResult('warning', `${key}`, `${data.confirms[key]}`);

                        }

                    }

                    $('#checkout_barcode').prop("readonly", true);

                    $('#checkoutSubmit').replaceWith('<input type="hidden" id="item_id" value="' + item_id + '"><input type="hidden" id="confirm_token" value="' + data.confirmation_token + '"><button type="submit" id="checkoutConfirm" class="btn btn-warning">Confirm</button>');

                }

                // straight checkout

                else {

                    let params = {

                        "checkout_id": undefined,

                        "patron_id": logged_in_user_id,

                        "item_id": item_id,

                        "due_date": undefined,

                        "library_id": undefined,

                        "issuer_id": undefined,

                        "checkin_date": undefined,

                        "last_renewed_date": undefined,

                        "renewals_count": undefined,

                        "unseen_renewals": undefined,

                        "auto_renew": undefined,

                        "auto_renew_error": undefined,

                        "timestamp": undefined,

                        "checkout_date": undefined,

                        "onsite_checkout": false,

                        "note": undefined,

                        "note_date": undefined,

                        "note_seen": undefined,

                    };

                    result = $.ajax({

                        url: '/api/v1/public/checkouts',

                        type: 'POST',

                        data: JSON.stringify(params),

                        contentType: "json"

                    });

                }

                // warnings to display

                if (Object.keys(data.warnings).length >= 1) {

                    for (const key in data.warnings) {

                        if (data.warnings.hasOwnProperty(key)) {

                            addResult('info', `${key}`, `${data.warnings[key]}`);

                        }

                    }

                }

                // return a rejected promise if we've reached here

                return result ? result : $.Deferred().reject('Checkout halted');

            },

            function(data, textStatus, jqXHR) {

                console.log('Items request failed with: ' + textStatus);

                console.log(data);

            }

        );

        checkout.then(

            function(data, textStatus, jqXHR) {

                addCheckout(data);

                // data retrieved from url2 as provided by the first request

            },

            function(data, textStatus, jqXHR) {

                console.log("checkout.then failed");

            }

        );

    });

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

        let external_id = $('#checkout_barcode').val();

        let item_id = $('#item_id').val();

        let token = $('#confirm_token').val();

        let params = {

            "checkout_id": undefined,

            "patron_id": logged_in_user_id,

            "item_id": item_id,

            "due_date": undefined,

            "library_id": undefined,

            "issuer_id": undefined,

            "checkin_date": undefined,

            "last_renewed_date": undefined,

            "renewals_count": undefined,

            "unseen_renewals": undefined,

            "auto_renew": undefined,

            "auto_renew_error": undefined,

            "timestamp": undefined,

            "checkout_date": undefined,

            "onsite_checkout": false,

            "note": undefined,

            "note_date": undefined,

            "note_seen": undefined,

        };

        let checkout = $.ajax({

            url: '/api/v1/public/checkouts?confirmation=' + token,

            type: 'POST',

            data: JSON.stringify(params),

            contentType: "json"

        });

        checkout.then(

            function(data, textStatus, jqXHR) {

                $('#item_id').remove;

                $('#confirm_token').remove;

                $('#availabilityResult').replaceWith('<div id="availabilityResult"></div>');

                addCheckout(data);

                // data retrieved from url2 as provided by the first request

            },

            function(data, textStatus, jqXHR) {

                console.log("checkout.then failed");

            }

        );

    });

    $('#checkoutModal').on('hidden.bs.modal', function (e) {

        let pageName = $(location).attr("pathname");

        if ( pageName == '/cgi-bin/koha/opac-user.pl' ) {

            location.reload();

        }

    })

});