import { getFieldByKey, getFieldValue } from "@/util/table-util";

export const fieldSorter = (sortKeys, nullsFirst, fields) => {
    return (a, b) => sortKeys.map(sortKey => {
        let dir = 1;
        if (sortKey[0] === '-') {
            dir = -1;
            sortKey = sortKey.substring(1);
        }

        let aValue = getFieldValue(a, sortKey, null).rawValue
        let bValue = getFieldValue(b, sortKey, null).rawValue

        const field = getFieldByKey(fields, sortKey)
        if(field) {
            if(field.sortByFormatted === true && field.formatter) {
                aValue = getFieldValue(a, field.key, field.formatter).formattedValue
                bValue = getFieldValue(b, field.key, field.formatter).formattedValue
            } else if(field.sortFormatter) {
                aValue = getFieldValue(a, field.key, field.sortFormatter).formattedValue
                bValue = getFieldValue(b, field.key, field.sortFormatter).formattedValue
            }
        }

        const nullValue = nullsFirst ? -1 : 1  // nulls are last by default, reverse that if 'nullsFirst' is true
        // console.log(`sort: a=[${aValue}], b=[${bValue}], !a=[${!aValue}], !b=[${!bValue}], a>b=[${aValue > bValue}], b>a=[${bValue > aValue}]`)
        if( !aValue && aValue !== 0 && !bValue && bValue !== 0 )
            return 0
        else if( !aValue && aValue !== 0 )
            return dir * nullValue
        else if( !bValue && bValue !== 0 )
            return -(dir) * nullValue
        else if( aValue > bValue )
            return dir
        else if( bValue > aValue )
            return -(dir)

        return 0
    }).reduce((p, n) => p ? p : n, 0);
}