/*
 * Copyright (c) 2013 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.builder.impl;

import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.model.api.AugmentationSchema;
import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
import org.opendaylight.yangtools.yang.model.api.NamespaceRevisionAware;
import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
import org.opendaylight.yangtools.yang.model.api.SchemaPath;
import org.opendaylight.yangtools.yang.model.api.Status;
import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode;
import org.opendaylight.yangtools.yang.model.api.UsesNode;
import org.opendaylight.yangtools.yang.model.util.RevisionAwareXPathImpl;
import org.opendaylight.yangtools.yang.parser.builder.api.AbstractDataNodeContainerBuilder;
import org.opendaylight.yangtools.yang.parser.builder.api.AugmentationSchemaBuilder;
import org.opendaylight.yangtools.yang.parser.builder.api.Builder;
import org.opendaylight.yangtools.yang.parser.builder.api.DataSchemaNodeBuilder;
import org.opendaylight.yangtools.yang.parser.builder.api.GroupingBuilder;
import org.opendaylight.yangtools.yang.parser.builder.api.TypeDefinitionBuilder;
import org.opendaylight.yangtools.yang.parser.builder.api.UsesNodeBuilder;
import org.opendaylight.yangtools.yang.parser.util.Comparators;
import org.opendaylight.yangtools.yang.parser.util.ParserUtils;
import org.opendaylight.yangtools.yang.parser.util.YangParseException;

public final class AugmentationSchemaBuilderImpl extends AbstractDataNodeContainerBuilder implements
        AugmentationSchemaBuilder {
    private boolean built;
    private final AugmentationSchemaImpl instance;

    private String whenCondition;

    private final String augmentTargetStr;
    private final SchemaPath targetPath;
    private SchemaPath targetNodeSchemaPath;

    private boolean resolved;

    public AugmentationSchemaBuilderImpl(final String moduleName, final int line, final String augmentTargetStr) {
        super(moduleName, line, null);
        this.augmentTargetStr = augmentTargetStr;
        targetPath = ParserUtils.parseXPathString(augmentTargetStr);
        instance = new AugmentationSchemaImpl(targetPath);
    }

    @Override
    public Set<GroupingDefinition> getGroupings() {
        return Collections.emptySet();
    }

    @Override
    public Set<GroupingBuilder> getGroupingBuilders() {
        return Collections.emptySet();
    }

    @Override
    public void addGrouping(GroupingBuilder grouping) {
        throw new YangParseException(moduleName, line, "augment can not contains grouping statement");
    }

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

    @Override
    public AugmentationSchema build() {
        if (!built) {

            Builder parent = getParent();
            if(parent instanceof ModuleBuilder) {
                ModuleBuilder moduleBuilder = (ModuleBuilder) parent;
                instance.setNamespace(moduleBuilder.getNamespace());
                instance.setRevision(moduleBuilder.getRevision());
            }

            instance.setTargetPath(targetNodeSchemaPath);

            RevisionAwareXPath whenStmt;
            if (whenCondition == null) {
                whenStmt = null;
            } else {
                whenStmt = new RevisionAwareXPathImpl(whenCondition, false);
            }
            instance.setWhenCondition(whenStmt);

            // CHILD NODES
            for (DataSchemaNodeBuilder node : addedChildNodes) {
                DataSchemaNode child = node.build();
                childNodes.add(child);
            }
            instance.addChildNodes(childNodes);

            // USES
            for (UsesNodeBuilder builder : addedUsesNodes) {
                usesNodes.add(builder.build());
            }
            instance.addUses(usesNodes);

            // UNKNOWN NODES
            for (UnknownSchemaNodeBuilder b : addedUnknownNodes) {
                unknownNodes.add(b.build());
            }
            Collections.sort(unknownNodes, Comparators.SCHEMA_NODE_COMP);
            instance.addUnknownSchemaNodes(unknownNodes);

            built = true;
        }
        return instance;
    }

    @Override
    public boolean isResolved() {
        return resolved;
    }

    @Override
    public void setResolved(boolean resolved) {
        this.resolved = resolved;
    }

    @Override
    public String getWhenCondition() {
        return whenCondition;
    }

    @Override
    public void addWhenCondition(String whenCondition) {
        this.whenCondition = whenCondition;
    }

    @Override
    public Set<TypeDefinitionBuilder> getTypeDefinitionBuilders() {
        return Collections.emptySet();
    }

    @Override
    public void addTypedef(TypeDefinitionBuilder type) {
        throw new YangParseException(moduleName, line, "Augmentation can not contains typedef statement.");
    }

    @Override
    public String getDescription() {
        return instance.description;
    }

    @Override
    public void setDescription(final String description) {
        instance.description = description;
    }

    @Override
    public String getReference() {
        return instance.reference;
    }

    @Override
    public void setReference(final String reference) {
        instance.reference = reference;
    }

    @Override
    public Status getStatus() {
        return instance.status;
    }

    @Override
    public void setStatus(Status status) {
        if (status != null) {
            instance.status = status;
        }
    }

    @Override
    public String getTargetPathAsString() {
        return augmentTargetStr;
    }

    @Override
    public SchemaPath getTargetPath() {
        return targetPath;
    }

    @Override
    public SchemaPath getTargetNodeSchemaPath() {
        return targetNodeSchemaPath;
    }

    @Override
    public void setTargetNodeSchemaPath(SchemaPath path) {
        this.targetNodeSchemaPath = path;
    }

    @Override
    public int hashCode() {
        final int prime = 17;
        int result = 1;
        result = prime * result + ((augmentTargetStr == null) ? 0 : augmentTargetStr.hashCode());
        result = prime * result + ((whenCondition == null) ? 0 : whenCondition.hashCode());
        result = prime * result + ((addedChildNodes == null) ? 0 : addedChildNodes.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        AugmentationSchemaBuilderImpl other = (AugmentationSchemaBuilderImpl) obj;
        if (augmentTargetStr == null) {
            if (other.augmentTargetStr != null) {
                return false;
            }
        } else if (!augmentTargetStr.equals(other.augmentTargetStr)) {
            return false;
        }
        if (whenCondition == null) {
            if (other.whenCondition != null) {
                return false;
            }
        } else if (!whenCondition.equals(other.whenCondition)) {
            return false;
        }
        if (addedChildNodes == null) {
            if (other.addedChildNodes != null) {
                return false;
            }
        } else if (!addedChildNodes.equals(other.addedChildNodes)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "augment " + augmentTargetStr;
    }

    private static final class AugmentationSchemaImpl implements AugmentationSchema, NamespaceRevisionAware {
        private SchemaPath targetPath;
        private RevisionAwareXPath whenCondition;
        private final Set<DataSchemaNode> childNodes = new TreeSet<>(Comparators.SCHEMA_NODE_COMP);
        private final Set<UsesNode> uses = new HashSet<>();
        private String description;
        private String reference;
        private Status status;

        private URI namespace;
        private Date revision;
        private final List<UnknownSchemaNode> unknownNodes = new ArrayList<>();

        private AugmentationSchemaImpl(SchemaPath targetPath) {
            this.targetPath = targetPath;
        }

        @Override
        public SchemaPath getTargetPath() {
            return targetPath;
        }

        private void setTargetPath(SchemaPath path) {
            this.targetPath = path;
        }

        @Override
        public RevisionAwareXPath getWhenCondition() {
            return whenCondition;
        }

        private void setWhenCondition(RevisionAwareXPath whenCondition) {
            this.whenCondition = whenCondition;
        }

        @Override
        public Set<DataSchemaNode> getChildNodes() {
            return Collections.unmodifiableSet(childNodes);
        }

        private void addChildNodes(Set<DataSchemaNode> childNodes) {
            if (childNodes != null) {
                this.childNodes.addAll(childNodes);
            }
        }

        /**
         * Always returns an empty set, because augment can not contains
         * grouping statement.
         */
        @Override
        public Set<GroupingDefinition> getGroupings() {
            return Collections.emptySet();
        }

        @Override
        public Set<UsesNode> getUses() {
            return Collections.unmodifiableSet(uses);
        }

        private void addUses(Set<UsesNode> uses) {
            if (uses != null) {
                this.uses.addAll(uses);
            }
        }

        /**
         * Always returns an empty set, because augment can not contains type
         * definitions.
         */
        @Override
        public Set<TypeDefinition<?>> getTypeDefinitions() {
            return Collections.emptySet();
        }

        @Override
        public String getDescription() {
            return description;
        }

        @Override
        public String getReference() {
            return reference;
        }

        @Override
        public Status getStatus() {
            return status;
        }

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

        private void addUnknownSchemaNodes(List<UnknownSchemaNode> unknownSchemaNodes) {
            if (unknownSchemaNodes != null) {
                this.unknownNodes.addAll(unknownSchemaNodes);
            }
        }

        @Override
        public DataSchemaNode getDataChildByName(QName name) {
            return getChildNode(childNodes, name);
        }

        @Override
        public DataSchemaNode getDataChildByName(String name) {
            return getChildNode(childNodes, name);
        }

        @Override
        public URI getNamespace() {
            return namespace;
        }

        protected void setNamespace(URI namespace) {
            this.namespace = namespace;
        }

        @Override
        public Date getRevision() {
            return revision;
        }

        protected void setRevision(Date revision) {
            this.revision = revision;
        }

        @Override
        public int hashCode() {
            final int prime = 17;
            int result = 1;
            result = prime * result + ((targetPath == null) ? 0 : targetPath.hashCode());
            result = prime * result + ((whenCondition == null) ? 0 : whenCondition.hashCode());
            result = prime * result + ((childNodes == null) ? 0 : childNodes.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj == null) {
                return false;
            }
            if (getClass() != obj.getClass()) {
                return false;
            }
            AugmentationSchemaImpl other = (AugmentationSchemaImpl) obj;
            if (targetPath == null) {
                if (other.targetPath != null) {
                    return false;
                }
            } else if (!targetPath.equals(other.targetPath)) {
                return false;
            }
            if (whenCondition == null) {
                if (other.whenCondition != null) {
                    return false;
                }
            } else if (!whenCondition.equals(other.whenCondition)) {
                return false;
            }
            if (childNodes == null) {
                if (other.childNodes != null) {
                    return false;
                }
            } else if (!childNodes.equals(other.childNodes)) {
                return false;
            }
            return true;
        }

        @Override
        public String toString() {
            StringBuilder sb = new StringBuilder(AugmentationSchemaImpl.class.getSimpleName());
            sb.append("[");
            sb.append("targetPath=" + targetPath);
            sb.append(", when=" + whenCondition);
            sb.append("]");
            return sb.toString();
        }
    }

}