package solutions.bitbadger.documents

/**
 * A comparison against a field in a JSON document
 *
 * @property op The operation for the field comparison
 * @property value The value against which the comparison will be made
 */
class Comparison<T>(val op: Op, val value: T) {

    /** Is the value for this comparison a numeric value? */
    val isNumeric: Boolean
        get() {
            val toCheck = when (op) {
                Op.IN      -> {
                    val values = value as? Collection<*>
                    if (values.isNullOrEmpty()) "" else values.elementAt(0)
                }
                Op.BETWEEN -> (value as Pair<*, *>).first
                else       -> value
            }
            return toCheck is Byte || toCheck is Short || toCheck is Int || toCheck is Long
        }

    override fun toString() =
        "$op $value"
}