// derive forecast table name from source tname + version id
function fcTable(tname, versionId) {
    return `pf.fc_${tname}_${versionId}`;
}

// map information_schema data_type to a clean postgres column type
function mapType(dataType, numericPrecision, numericScale) {
    switch (dataType) {
        case 'character varying':
        case 'character':
        case 'text':
            return 'text';
        case 'smallint':
        case 'integer':
            return 'integer';
        case 'bigint':
            return 'bigint';
        case 'numeric':
        case 'decimal':
            return (numericPrecision)
                ? `numeric(${numericPrecision}, ${numericScale || 0})`
                : 'numeric';
        case 'real':
        case 'double precision':
            return 'numeric';
        case 'date':
            return 'date';
        case 'timestamp without time zone':
            return 'timestamp';
        case 'timestamp with time zone':
            return 'timestamptz';
        case 'boolean':
            return 'boolean';
        default:
            return 'text';
    }
}

module.exports = { fcTable, mapType };