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package io.getunleash.strategy.constraints;

import io.getunleash.Constraint;
import io.getunleash.Operator;
import io.getunleash.UnleashContext;
import java.time.ZonedDateTime;

public class DateConstraintOperator implements ConstraintOperator {

    @Override
    public boolean evaluate(Constraint constraint, UnleashContext context) {
        ZonedDateTime dateToMatch =
                context.getByName(constraint.getContextName())
                        .map(DateParser::parseDate)
                        .orElseGet(() -> context.getCurrentTime().orElseGet(ZonedDateTime::now));
        try {
            ZonedDateTime value = DateParser.parseDate(constraint.getValue());
            return eval(constraint.getOperator(), value, dateToMatch);
        } catch (Exception e) {
            return false;
        }
    }

    private boolean eval(Operator op, ZonedDateTime value, ZonedDateTime toMatch) {
        switch (op) {
            case DATE_AFTER:
                return toMatch.isAfter(value);
            case DATE_BEFORE:
                return toMatch.isBefore(value);
            default:
                return false;
        }
    }
}