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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.base;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.function.BiFunction;
import java.util.function.Function;

import javax.enterprise.inject.spi.CDI;

import com.appslandia.common.base.Out;
import com.appslandia.common.cdi.CDIUtils;
import com.appslandia.common.utils.AssertUtils;
import com.appslandia.common.utils.ReflectionUtils;

/**
 *
 * @author Loc Ha
 *
 */
public class ActionScanner {

	final List> controllers = new ArrayList<>();

	public ActionScanner addControllerClass(Class implClass) {
		AssertUtils.assertNotNull(implClass.getDeclaredAnnotation(Controller.class));

		this.controllers.add(implClass);
		return this;
	}

	public void scanActions(Function matcher, BiFunction, Method, Boolean> consumer) {
		for (Class controllerClass : this.controllers) {

			// @Removed
			if (controllerClass.getDeclaredAnnotation(Removed.class) != null) {
				continue;
			}
			for (Method actionMethod : controllerClass.getMethods()) {
				if (!ActionDescUtils.isActionMethod(actionMethod)) {
					continue;
				}
				if ((matcher != null) && !Boolean.TRUE.equals(matcher.apply(actionMethod))) {
					continue;
				}
				if (Boolean.TRUE.equals(consumer.apply(controllerClass, actionMethod))) {
					return;
				}
			}
		}
	}

	public boolean hasAction(Function matcher) {
		final Out out = new Out<>();
		scanActions(matcher, (controllerClass, actionMethod) -> {
			out.value = true;
			return true;
		});
		return Boolean.TRUE.equals(out.value);
	}

	public boolean hasAnnotation(Class annotation) {
		return hasAction(m -> m.getDeclaredAnnotation(annotation) != null);
	}

	public static ActionScanner getInstance() {
		final ActionScanner scanner = new ActionScanner();
		CDIUtils.scanBeanClasses(CDI.current().getBeanManager(), Object.class, ReflectionUtils.EMPTY_ANNOTATIONS, Controller.class, (c, implClass) -> {
			scanner.addControllerClass(implClass);
		});
		return scanner;
	}
}