/**
 * Validate the content of the form based on the fields definition
 */

import { getValue, isEmpty } from '../../commons/utils';
import msgs from '../../commons/messages';

/**
 * Validate a data model against its validation rules in the form layout
 * @param  {array} elems    List of elements that contains the rules to be validated
 * @param  {object} dm       The data model to be validated
 * @return {array}           List of errors found
 */
export default function validateForm(form) {
    let errors = null;

    const snapshots = form.state.snapshots;
    const doc = form.props.doc;

    // browse all fields
    snapshots.filter(it => !!it.snapshot.property).forEach(elem => {
        const snapshot = elem.snapshot;
        const value = getValue(doc, snapshot.property);

        let msg;
        // no value informed ?
        if (isEmpty(value)) {
            // value is required ?
            if (snapshot.required) {
                // if required and empty, so show required message
                msg = msgs.NotNull;
            }
        } else {
            // validate value
            const comp = form.refs[snapshot.id];
            msg = comp.validate(snapshot, value, doc);
        }

        if (msg) {
            if (!errors) {
                errors = [];
            }
            errors.push({ field: snapshot.property, msg: msg });
        }
    });

    return errors;
}