wikimedia/wikimedia-fundraising-dash

define( [
    'knockout',
    'text!components/filters/number-filter/number-filter.html',
    'operators'
], function ( ko, template, ops ) {

    function NumberFilterViewModel( params ) {
        var self = this;

        this.operators = [
            ops.eq,
            ops.gt,
            ops.lt,
            ops.ge,
            ops.le
        ];
        this.selectedOperator = ko.observable( params.userChoices().operator || 'eq' );
        this.value = ko.observable( params.userChoices().value || '' );
        this.min = params.metadata.min;
        this.max = params.metadata.max;

        this.changed = function () {
            var value = self.value();

            params.userChoices( {
                operator: self.selectedOperator(),
                value: value
            } );

            if ( value === '' ) {
                params.queryString( '' );
                return;
            }

            params.queryString(
                params.name + ' ' + self.selectedOperator() + ' \'' + value + '\''
            );
        };

        this.selectedOperator.subscribe( this.changed );
        this.value.subscribe( this.changed );
        this.changed();
    }

    return { viewModel: NumberFilterViewModel, template: template };
} );