// Globals
// -----------------------------------------------------------------------------
var petitions = [];
var table;



// Supplamentary functions
// -----------------------------------------------------------------------------

// array.indexOf polyfill
// --- -- -- - - -
if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length >>> 0;

    var from = Number(arguments[1]) || 0;
    from = (from < 0)
         ? Math.ceil(from)
         : Math.floor(from);
    if (from < 0)
      from += len;

    for (; from < len; from++)
    {
      if (from in this &&
          this[from] === elt)
        return from;
    }
    return -1;
  };
}


// return petitions record by petition-id
// --- -- -- - - -
function petition_record(id) {
    var record = false;
    petitions.forEach(el => { if (el.id == id) record = el; });
   
    return record;
}


// create actions html (edit and delete buttons)
// --- -- -- - - -
function create_actions_html(signature) {

    var del, edit, show;

    del = "";
    edit = "";

    show = [
        '<a type="button" target="_blank" class="btn btn-xs btn-warning"',
            'href="/petition/signature/'+ signature +'">',
            '<i class="fa-regular fa-circle-down"></i>',
        '</a>'
    ].join('\n');

    return show +' '+ edit +' '+ del;
}



$(document).ready(function() {

    // When document is ready
    // -------------------------------------------------------------------------

       
    /** init_table
     * --- -- -- - - -
     * get categories
     * constuct categories array
     * render dataTable 
     */
    function init_table() {

        // get all categories from server (ajax)
        $.getJSON( "/user/get/petitions")
        .done(function( json ) {
            // then ...
            console.log(json);

            // reset categories
            petitions.length = 0;

            // construct petitions data
            json.data.forEach( el => {
                petitions.push({
                    id: parseInt(el.id),
                    subject: el.subject,
                    protocol: el.protocol,
                    signature: el.signature,
                    datepost: el.creation_date,
                    actions: create_actions_html(el.signature)
                });
            });


            // destroy previous datatable table instances
            $('#dt-petitions').dataTable().fnClearTable();
            $('#dt-petitions').dataTable().fnDestroy();

            // (re-)create categories datatable
            table = $('#dt-petitions').DataTable({
                language: { url: '/assets/js/DataTables/localization/Greek.json' },           
                data: petitions,
                // ordering: false,
                columns: [
                    { data: 'subject', width: '55%' },
                    { data: 'protocol' },
                    // { data: 'signature' },
                    { data: 'datepost' },
                    { data: 'actions' }
                ]
            });

        })
        .fail(function( jqxhr, textStatus, error ) {
            console.log( "Request Failed (" + error +")" );
        });

    }
    init_table();   // init table on first run



    /** When modal show-up
     * -------------------------------------------------------------------------
     * ... prepare the manage-category form 
     * ... update select2 with possible parents
     */
    $('#manageCategory').on('show.bs.modal', event => {
        var button = $(event.relatedTarget);        // Button that triggered the modal
        var id = parseInt( button.data('id') );     // category_id from data-id
        // var modal = $(this);    // modal object     
        
        // update modal literature
        // ---
        $('#manageCategory .modal-title').html(             // modal title
            (id) ? 'Ενημέρωση Κατηγορίας' : 'Δημιουργία Κατηγορίας'
        );
        $('#manageCategory form input[name=id]').val( id );     // category id (hidden)
        $('#manageCategory form input[name=title]').val(    // category title
            (id) ? category_record(id).title : ""
        );
        prepare_parents_element(id);        // prepare <select> for parents
    })



    // When form is submited
    // -------------------------------------------------------------------------

    $('#manageCategory form').submit( event => {
        event.preventDefault();

        // prepare data to POST
        var data = {
            id: parseInt($('#manageCategory form input[name=id]').val()),
            title: $('#manageCategory form input[name=title]').val(),
            parent_id: parseInt($('#parent_id').select2('data')[0].id)
        };

        // select action url (add or update)
        var request = '/wiki/ajax?action=' + ((data.id == 0)  ? 'add_category' : 'update_category');

        // send POST request
        $.post(request, data)
        .done(function( data ) {

            $('#manageCategory').modal('hide');     // when done, close modal

            init_table();       // reload table of categories
        });       

    });

});