define([
    'dojo/_base/declare',
    'dojo/_base/lang',
    'dijit/Dialog',
    'dojo/aspect',
    'Sage/UI/SDataLookup'
],
function (
    declare,
    lang,
    dialog,
    aspect,
    SDataLookup
) {

    // define new column type for grid
    var contactColumn = declare('FX.ContactColumn', null, {
        icon: '',
        defaultValue: '',
        constructor: function (args) {
            lang.mixin(this, args);
        },
        format: function (val, entity) {
            // column will call show in the object defined below
            var exec = "javascript:FX.ViewContacts.show('"  + val + "', '" + entity.$descriptor + "')";
            return '<a href="' + exec + '">Contacts</a>';
        }
    });

    var __viewContacts = {
        show: function(accountId, accountName) {
            // define dialog
            var dlg = new dialog({
                title: 'Contacts for ' + (accountName || 'Account'),
                style: 'width: 400px;',
                content: '<i>Loading contacts...</i>'
            });

            // use SData to retrieve contacts for account
            var service = Sage.Data.SDataServiceRegistry.getSDataService('dynamic');
            var request = new Sage.SData.Client.SDataResourceCollectionRequest(service)
                .setResourceKind('contacts')
                .setQueryArg('where', 'Account.Id eq "' + accountId + '"')
                .setQueryArg('select', 'LastName,FirstName,Title');

            request.read({
                success: function (results) {
                    // create content for dialog
                    var content = '';
                    results.$resources.forEach(function(contact) {
                        content += '<li>' + contact.FirstName + ' ' + contact.LastName;
                        if (contact.Title) content += ' - ' + contact.Title;
                        content += ' <a href="Contact.aspx&entityId=' + contact.$key + '" tabindex="-1" title="View Contact"><i class="fa fa-external-link"></i></a></li>';
                    });
                    content = (content == '' ? '<i>Account does not have any contacts</i>' : '<ul>' + content + '</ul>');

                    // set dialog content & show
                    dlg.set('content', content);
                    dlg.show();
                },
                failure: function (result) {
                    Sage.UI.Dialogs.showError(result);
                }
            });
        },

        // add new column to lookups that are for accounts
        initLookupColumns: function() {
            aspect.before(SDataLookup.prototype, 'initGrid', function() {
                var col = {
                    name: 'FXViewContacts',
                    field: '$key',
                    label: '',
                    type: contactColumn,
                    sortable: false,
                    width: 5
                };
                if (this.sdataStore.resourceKind === 'accounts' && this.structure.filter(function(c) { return c.name === 'FXViewContacts' }).length === 0) {
                    this.structure.push(col);
                }
            });
        }
    };

    __viewContacts.initLookupColumns();

    // add to window namespace so can be invoked from hyperlink
    window.FX = window.FX || {};
    window.FX.ViewContacts = __viewContacts;
});