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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package br.com.anteros.bean.validation;

import java.lang.annotation.ElementType;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import br.com.anteros.bean.validation.groups.Group;
import br.com.anteros.bean.validation.groups.Groups;
import br.com.anteros.bean.validation.groups.GroupsComputer;
import br.com.anteros.bean.validation.model.MetaBean;
import br.com.anteros.validation.api.metadata.ConstraintDescriptor;
import br.com.anteros.validation.api.metadata.ElementDescriptor;
import br.com.anteros.validation.api.metadata.Scope;
import br.com.anteros.validation.api.metadata.ElementDescriptor.ConstraintFinder;

/**
 * Description: Implementation of the fluent {@link ConstraintFinder} interface.

 */
final class ConstraintFinderImpl implements ElementDescriptor.ConstraintFinder {
    private final MetaBean metaBean;
    private final Set findInScopes;
    private Set> constraintDescriptors;

    /**
     * Create a new ConstraintFinderImpl instance.
     * 
     * @param metaBean
     * @param constraintDescriptors
     */
    ConstraintFinderImpl(MetaBean metaBean, Set> constraintDescriptors) {
        this.metaBean = metaBean;
        this.constraintDescriptors = constraintDescriptors;
        this.findInScopes = new HashSet(Arrays.asList(Scope.values()));
    }

    /**
     * {@inheritDoc}
     */
    public ElementDescriptor.ConstraintFinder unorderedAndMatchingGroups(Class... groups) {
        Set> matchingDescriptors =
            new HashSet>(constraintDescriptors.size());
        Groups groupChain = new GroupsComputer().computeGroups(groups);
        for (Group group : groupChain.getGroups()) {
            if (group.isDefault()) {
                // If group is default, check if it gets redefined
                List expandedDefaultGroup = metaBean.getFeature(Jsr303Features.Bean.GROUP_SEQUENCE);
                for (Group defaultGroupMember : expandedDefaultGroup) {
                    for (ConstraintValidation descriptor : constraintDescriptors) {
                        if (isInScope(descriptor) && isInGroup(descriptor, defaultGroupMember)) {
                            matchingDescriptors.add(descriptor);
                        }
                    }
                }
            } else {
                for (ConstraintValidation descriptor : constraintDescriptors) {
                    if (isInScope(descriptor) && isInGroup(descriptor, group)) {
                        matchingDescriptors.add(descriptor);
                    }
                }
            }
        }
        return thisWith(matchingDescriptors);
    }

    /**
     * {@inheritDoc}
     */
    public ElementDescriptor.ConstraintFinder lookingAt(Scope scope) {
        if (scope.equals(Scope.LOCAL_ELEMENT)) {
            findInScopes.remove(Scope.HIERARCHY);
            for (Iterator> it = constraintDescriptors.iterator(); it.hasNext();) {
                ConstraintValidation cv = it.next();
                if (cv.getOwner() != metaBean.getBeanClass()) {
                    it.remove();
                }
            }
        }
        return this;
    }

    /**
     * {@inheritDoc}
     */
    public ElementDescriptor.ConstraintFinder declaredOn(ElementType... elementTypes) {
        Set> matchingDescriptors =
            new HashSet>(constraintDescriptors.size());
        for (ElementType each : elementTypes) {
            for (ConstraintValidation descriptor : constraintDescriptors) {
                if (isInScope(descriptor) && isAtElement(descriptor, each)) {
                    matchingDescriptors.add(descriptor);
                }
            }
        }
        return thisWith(matchingDescriptors);
    }

    private boolean isAtElement(ConstraintValidation descriptor, ElementType each) {
        return descriptor.getAccess().getElementType() == each;
    }

    private boolean isInScope(ConstraintValidation descriptor) {
        if (findInScopes.size() == Scope.values().length)
            return true; // all scopes
        if (metaBean != null) {
            Class owner = descriptor.getOwner();
            for (Scope scope : findInScopes) {
                switch (scope) {
                case LOCAL_ELEMENT:
                    if (owner.equals(metaBean.getBeanClass()))
                        return true;
                    break;
                case HIERARCHY:
                    if (!owner.equals(metaBean.getBeanClass()))
                        return true;
                    break;
                }
            }
        }
        return false;
    }

    private boolean isInGroup(ConstraintValidation descriptor, Group group) {
        return descriptor.getGroups().contains(group.getGroup());
    }

    private ElementDescriptor.ConstraintFinder thisWith(Set> matchingDescriptors) {
        constraintDescriptors = matchingDescriptors;
        return this;
    }

    /**
     * {@inheritDoc}
     */
    public Set> getConstraintDescriptors() {
        return constraintDescriptors.isEmpty() ? Collections.> emptySet() : Collections
            .> unmodifiableSet(constraintDescriptors);
    }

    /**
     * {@inheritDoc}
     */
    public boolean hasConstraints() {
        return !constraintDescriptors.isEmpty();
    }
}