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package org.apache.juneau.rest.arg;

import static org.apache.juneau.common.internal.StringUtils.*;

import java.lang.reflect.*;

import org.apache.juneau.*;
import org.apache.juneau.http.annotation.*;
import org.apache.juneau.reflect.*;
import org.apache.juneau.rest.*;
import org.apache.juneau.rest.annotation.*;
import org.apache.juneau.rest.httppart.*;

/**
 * Resolves method parameters annotated with {@link HasQuery} on {@link RestOp}-annotated Java methods.
 *
 * <p>
 * The parameter value is resolved using:
 * <p class='bjava'>
 * 	<jv>opSession</jv>
 * 		.{@link RestOpSession#getRequest() getRequest}()
 * 		.{@link RestRequest#getQueryParams() getQueryParams}()
 * 		.{@link RequestQueryParams#contains(String) contains}(<jv>name</jv>);
 * </p>
 *
 * <p>
 * The parameter type can be a <jk>boolean</jk> or anything convertible from a <jk>boolean</jk>.
 *
 * <h5 class='section'>See Also:</h5><ul>
 * 	<li class='link'><a class="doclink" href="../../../../../index.html#jrs.JavaMethodParameters">Java Method Parameters</a>
 * </ul>
 */
public class HasQueryArg implements RestOpArg {

	private final String name;
	private final Type type;

	/**
	 * Static creator.
	 *
	 * @param paramInfo The Java method parameter being resolved.
	 * @return A new {@link HasQueryArg}, or <jk>null</jk> if the parameter is not annotated with {@link HasQuery}.
	 */
	public static HasQueryArg create(ParamInfo paramInfo) {
		if (paramInfo.hasAnnotation(HasQuery.class))
			return new HasQueryArg(paramInfo);
		return null;
	}

	/**
	 * Constructor.
	 *
	 * @param pi The Java method parameter being resolved.
	 */
	protected HasQueryArg(ParamInfo pi) {
		Value<String> _name = Value.empty();
		pi.forEachAnnotation(HasQuery.class, HasQueryArg::hasName, x -> _name.set(getName(x)));
		this.name = _name.orElseThrow(() -> new ArgException(pi, "@HasQuery used without name or value"));
		this.type = pi.getParameterType().innerType();
	}

	private static boolean hasName(HasQuery x) {
		return isNotEmpty(x.name()) || isNotEmpty(x.value());
	}

	private static String getName(HasQuery x) {
		return firstNonEmpty(x.name(), x.value());
	}

	@Override /* RestOpArg */
	public Object resolve(RestOpSession opSession) throws Exception {
		RestRequest req = opSession.getRequest();
		BeanSession bs = req.getBeanSession();
		return bs.convertToType(req.getQueryParams().contains(name), bs.getClassMeta(type));
	}
}
