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package com.github.dakusui.lisj.special;

import static com.github.dakusui.lisj.Basic.get;
import static com.github.dakusui.lisj.Basic.length;

import com.github.dakusui.jcunit.core.Utils;
import com.github.dakusui.jcunit.exceptions.JCUnitException;
import com.github.dakusui.lisj.BaseForm;
import com.github.dakusui.lisj.CUT;
import com.github.dakusui.lisj.Context;
import com.github.dakusui.lisj.FormResult;

public class When extends BaseForm {

	/**
	 * Serial version UID.
	 */
	private static final long serialVersionUID = 2600006689489802965L;

	@Override
	protected FormResult evaluateEach(Context context,
			Object currentParam, FormResult lastResult) throws JCUnitException, CUT {
		int pos = lastResult.nextPosition();
		FormResult ret = evaluateEachSimply(context, currentParam, lastResult);

		if (pos == 0) {
			if (ret.value() instanceof Boolean) {
				boolean res = (Boolean) ret.value();
				if (!res) cut(res);
			} else {
				throw new IllegalArgumentException(msgFirstParameterTypeMismatch(currentParam));
			}
		}
		return ret;
	}

	@Override
	protected FormResult evaluateLast(Context context, Object[] evaluatedParams, FormResult lastResult) {
		return lastResult;
	}
	
	/* The first parameter must be or return a boolean value.
	 * The rest can be anything.
	 *
	 * @see com.github.dakusui.lisj.BaseForm#checkParams(java.lang.Object[])
	 */
	@Override
	protected Object checkParams(Object params) {
		if (length(super.checkParams(params)) < 1) throw new IllegalArgumentException();
		Utils.checknull(get(params, 0));
		return params;
	}
	
	@Override
	protected boolean throwsCUT() {
		return true;
	}
}