// Use a global for the submit and return data rendering in the examples.
// Don't do this outside of the Editor examples!
var editor;
 
// Display an Editor form that allows the user to pick the CSV data to apply to each column
function selectColumns ( editor, csv, header ) {
    var selectEditor = new $.fn.dataTable.Editor();
    var fields = editor.order();
 
    for ( var i=0 ; i<fields.length ; i++ ) {
        var field = editor.field( fields[i] );
 
        selectEditor.add( {
            label: field.label(),
            name: field.name(),
            type: 'select',
            options: header,
            def: header[i]
        } );
    }
 
    selectEditor.create({
        title: 'Map CSV fields',
        buttons: 'Import '+csv.length+' records',
        message: 'Select the CSV column you want to use the data from for each field.',
        onComplete: 'none'
    });
 
    selectEditor.on('submitComplete', function (e, json, data, action) {
        // Use the host Editor instance to show a multi-row create form allowing the user to submit the data.
        editor.create( csv.length, {
            title: 'Confirm import',
            buttons: 'Submit',
            message: 'Click the <i>Submit</i> button to confirm the import of '+csv.length+' rows of data. Optionally, override the value for a field to set a common value by clicking on the field below.'
        } );
 
        for ( var i=0 ; i<fields.length ; i++ ) {
            var field = editor.field( fields[i] );
            var mapped = data[ field.name() ];
 
            for ( var j=0 ; j<csv.length ; j++ ) {
                field.multiSet( j, csv[j][mapped] );
            }
        }
    } );
}
 
$(document).ready(function() {
    // Regular editor for the table
    editor = new $.fn.dataTable.Editor( {
        ajax: "../php/staff.php",
        table: "#example",
        fields: [ {
                label: "First name:",
                name: "first_name"
            }, {
                label: "Last name:",
                name: "last_name"
            }, {
                label: "Position:",
                name: "position"
            }, {
                label: "Office:",
                name: "office"
            }, {
                label: "Start date:",
                name: "start_date",
                type: "datetime"
            }, {
                label: "Salary:",
                name: "salary"
            }
        ]
    } );
 
    // Upload Editor - triggered from the import button. Used only for uploading a file to the browser
    var uploadEditor = new $.fn.dataTable.Editor( {
        fields: [ {
            label: 'CSV file:',
            name: 'csv',
            type: 'upload',
            ajax: function ( files, done ) {
                // Ajax override of the upload so we can handle the file locally. Here we use Papa
                // to parse the CSV.
                Papa.parse(files[0], {
                    header: true,
                    skipEmptyLines: true,
                    complete: function (results) {
                        if ( results.errors.length ) {
                            console.log( results );
                            uploadEditor.field('csv').error( 'CSV parsing error: '+ results.errors[0].message );
                        }
                        else {
                            selectColumns( editor, results.data, results.meta.fields );
                        }
 
                        // Tell Editor the upload is complete - the array is a list of file
                        // id's, which the value of doesn't matter in this case.
                        done([0]);
                    }
                });
            }
        } ]
    } );
 
    $('#example').DataTable( {
        dom: 'Bfrtip',
        ajax: "../php/staff.php",
        columns: [
            { data: 'first_name' },
            { data: 'last_name' },
            { data: "position" },
            { data: "office" },
            { data: "start_date" },
            { data: "salary", render: $.fn.dataTable.render.number( ',', '.', 0, '$' ) }
        ],
        select: true,
        buttons: [
            { extend: 'create', editor: editor },
            { extend: 'edit',   editor: editor },
            { extend: 'remove', editor: editor },
            {
                extend: 'csv',
                text: 'Export CSV',
                className: 'btn-space',
                exportOptions: {
                    orthogonal: null
                }
            },
            {
                text: 'Import CSV',
                action: function () {
                    uploadEditor.create( {
                        title: 'CSV file import'
                    } );
                }
            },
            {
                extend: 'selectAll',
                className: 'btn-space'
            },
            'selectNone',
        ]
    } );
} );