/**
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.yang.parser.stmt.rfc6020.effective;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
import org.opendaylight.yangtools.yang.model.api.ConstraintDefinition;
import org.opendaylight.yangtools.yang.model.api.DerivableSchemaNode;
import org.opendaylight.yangtools.yang.model.api.SchemaPath;
import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode;
import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
import org.opendaylight.yangtools.yang.model.api.stmt.CaseStatement;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.TypeOfCopy;
import org.opendaylight.yangtools.yang.parser.stmt.rfc6020.Utils;

public class CaseEffectiveStatementImpl extends AbstractEffectiveDocumentedDataNodeContainer<QName, CaseStatement>
        implements ChoiceCaseNode, DerivableSchemaNode {
    private final QName qname;
    private final SchemaPath path;
    private final ConstraintDefinition constraints;

    private boolean augmenting;
    private boolean addedByUses;
    private ChoiceCaseNode original;
    private ImmutableSet<AugmentationSchema> augmentations;
    private ImmutableList<UnknownSchemaNode> unknownNodes;

    public CaseEffectiveStatementImpl(
            final StmtContext<QName, CaseStatement, EffectiveStatement<QName, CaseStatement>> ctx) {
        super(ctx);
        this.qname = ctx.getStatementArgument();
        this.path = Utils.getSchemaPath(ctx);
        this.constraints = new EffectiveConstraintDefinitionImpl(this);

        initSubstatementCollections();
        initCopyType(ctx);
    }

    private void initCopyType(
            final StmtContext<QName, CaseStatement, EffectiveStatement<QName, CaseStatement>> ctx) {

        List<TypeOfCopy> copyTypesFromOriginal = ctx.getCopyHistory();

        if(copyTypesFromOriginal.contains(TypeOfCopy.ADDED_BY_AUGMENTATION)) {
            augmenting = true;
        }
        if(copyTypesFromOriginal.contains(TypeOfCopy.ADDED_BY_USES)) {
            addedByUses = true;
        }
        if(copyTypesFromOriginal.contains(TypeOfCopy.ADDED_BY_USES_AUGMENTATION)) {
            addedByUses = augmenting = true;
        }

        if (ctx.getOriginalCtx() != null) {
            original = (ChoiceCaseNode) ctx.getOriginalCtx().buildEffective();
        }
    }

    private void initSubstatementCollections() {
        Collection<? extends EffectiveStatement<?, ?>> effectiveSubstatements = effectiveSubstatements();

        List<UnknownSchemaNode> unknownNodesInit = new LinkedList<>();
        Set<AugmentationSchema> augmentationsInit = new HashSet<>();

        for (EffectiveStatement<?, ?> effectiveStatement : effectiveSubstatements) {
            if (effectiveStatement instanceof UnknownSchemaNode) {
                UnknownSchemaNode unknownNode = (UnknownSchemaNode) effectiveStatement;
                unknownNodesInit.add(unknownNode);
            }
            if (effectiveStatement instanceof AugmentationSchema) {
                AugmentationSchema augmentationSchema = (AugmentationSchema) effectiveStatement;
                augmentationsInit.add(augmentationSchema);
            }
        }

        this.unknownNodes = ImmutableList.copyOf(unknownNodesInit);
        this.augmentations = ImmutableSet.copyOf(augmentationsInit);
    }

    @Override
    public QName getQName() {
        return qname;
    }

    @Override
    public SchemaPath getPath() {
        return path;
    }

    @Override
    public boolean isConfiguration() {
        return false;
    }

    @Override
    public ConstraintDefinition getConstraints() {
        return constraints;
    }

    @Override
    public boolean isAugmenting() {
        return augmenting;
    }

    @Override
    public boolean isAddedByUses() {
        return addedByUses;
    }

    @Override
    public Optional<ChoiceCaseNode> getOriginal() {
        return Optional.fromNullable(original);
    }

    @Override
    public List<UnknownSchemaNode> getUnknownSchemaNodes() {
        return unknownNodes;
    }

    @Override
    public Set<AugmentationSchema> getAvailableAugmentations() {
        return augmentations;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + Objects.hashCode(qname);
        result = prime * result + Objects.hashCode(path);
        return result;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        CaseEffectiveStatementImpl other = (CaseEffectiveStatementImpl) obj;
        return Objects.equals(qname, other.qname) && Objects.equals(path, other.path);
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(CaseEffectiveStatementImpl.class.getSimpleName());
        sb.append("[");
        sb.append("qname=");
        sb.append(qname);
        sb.append("]");
        return sb.toString();
    }
}