/*
 * 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.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
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.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.UnknownSchemaNodeBuilder;
import org.opendaylight.yangtools.yang.parser.builder.api.UsesNodeBuilder;
import org.opendaylight.yangtools.yang.parser.builder.util.AbstractDataNodeContainerBuilder;
import org.opendaylight.yangtools.yang.parser.util.YangParseException;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;

public final class GroupingBuilderImpl extends AbstractDataNodeContainerBuilder implements GroupingBuilder {
    private GroupingDefinitionImpl instance;
    // SchemaNode args
    private SchemaPath schemaPath;
    private String description;
    private String reference;
    private Status status = Status.CURRENT;
    // DataSchemaNode args
    private boolean addedByUses;

    public GroupingBuilderImpl(final String moduleName, final int line, final QName qname, final SchemaPath path) {
        super(moduleName, line, qname);
        this.schemaPath = Preconditions.checkNotNull(path, "Schema Path must not be null");
    }

    public GroupingBuilderImpl(final String moduleName, final int line, final QName qname, final SchemaPath path,
            final GroupingDefinition base) {
        this(moduleName, line, base.getQName(),path);

        description = base.getDescription();
        reference = base.getReference();
        status = base.getStatus();
        addedByUses = base.isAddedByUses();

        URI ns = qname.getNamespace();
        Date rev = qname.getRevision();
        String pref = qname.getPrefix();
        addedChildNodes.addAll(BuilderUtils.wrapChildNodes(moduleName, line, base.getChildNodes(), path, ns, rev, pref));
        addedGroupings.addAll(BuilderUtils.wrapGroupings(moduleName, line, base.getGroupings(), path, ns, rev, pref));
        addedTypedefs.addAll(BuilderUtils.wrapTypedefs(moduleName, line, base, path, ns, rev, pref));
        addedUnknownNodes.addAll(BuilderUtils.wrapUnknownNodes(moduleName, line, base.getUnknownSchemaNodes(), path, ns,
                rev, pref));

        usesNodes.addAll(base.getUses());
    }

    @Override
    public GroupingDefinition build() {
        if (instance != null) {
            return instance;
        }

        instance = new GroupingDefinitionImpl(qname, schemaPath);

        instance.description = description;
        instance.reference = reference;
        instance.status = status;
        instance.addedByUses = addedByUses;

        // CHILD NODES
        for (DataSchemaNodeBuilder node : addedChildNodes) {
            childNodes.put(node.getQName(), node.build());
        }
        instance.childNodes = ImmutableSet.copyOf(childNodes.values());

        // GROUPINGS
        for (GroupingBuilder builder : addedGroupings) {
            groupings.add(builder.build());
        }
        instance.groupings = ImmutableSet.copyOf(groupings);

        // TYPEDEFS
        for (TypeDefinitionBuilder entry : addedTypedefs) {
            typedefs.add(entry.build());
        }
        instance.typeDefinitions = ImmutableSet.copyOf(typedefs);

        // USES
        for (UsesNodeBuilder builder : addedUsesNodes) {
            usesNodes.add(builder.build());
        }
        instance.uses = ImmutableSet.copyOf(usesNodes);

        // UNKNOWN NODES
        for (UnknownSchemaNodeBuilder b : addedUnknownNodes) {
            unknownNodes.add(b.build());
        }
        instance.unknownNodes = ImmutableList.copyOf(unknownNodes);

        return instance;
    }

    @Override
    public Set<DataSchemaNodeBuilder> instantiateChildNodes(final Builder newParent) {
        final Set<DataSchemaNodeBuilder> nodes = new HashSet<>();
        for (DataSchemaNodeBuilder node : addedChildNodes) {
            DataSchemaNodeBuilder copy = CopyUtils.copy(node, newParent, true);
            BuilderUtils.setNodeAddedByUses(copy);
            nodes.add(copy);
        }
        return nodes;
    }

    @Override
    public Set<TypeDefinitionBuilder> instantiateTypedefs(final Builder newParent) {
        final Set<TypeDefinitionBuilder> nodes = new HashSet<>();
        for (TypeDefinitionBuilder node : addedTypedefs) {
            TypeDefinitionBuilder copy = CopyUtils.copy(node, newParent, true);
            nodes.add(copy);
        }
        return nodes;
    }

    @Override
    public Set<GroupingBuilder> instantiateGroupings(final Builder newParent) {
        final Set<GroupingBuilder> nodes = new HashSet<>();
        for (GroupingBuilder node : addedGroupings) {
            GroupingBuilder copy = CopyUtils.copy(node, newParent, true);
            copy.setAddedByUses(true);
            for (DataSchemaNodeBuilder childNode : copy.getChildNodeBuilders()) {
                BuilderUtils.setNodeAddedByUses(childNode);
            }
            nodes.add(copy);
        }
        return nodes;
    }

    @Override
    public Set<UnknownSchemaNodeBuilder> instantiateUnknownNodes(final Builder newParent) {
        final Set<UnknownSchemaNodeBuilder> nodes = new HashSet<>();
        for (UnknownSchemaNodeBuilder node : addedUnknownNodes) {
            UnknownSchemaNodeBuilderImpl copy = CopyUtils.copy(node, newParent, true);
            copy.setAddedByUses(true);
            nodes.add(copy);
        }
        return nodes;
    }

    @Override
    public Set<TypeDefinitionBuilder> getTypeDefinitionBuilders() {
        return addedTypedefs;
    }

    @Override
    public void addTypedef(final TypeDefinitionBuilder type) {
        String typeName = type.getQName().getLocalName();
        for (TypeDefinitionBuilder addedTypedef : addedTypedefs) {
            throw new YangParseException(getModuleName(), type.getLine(), "Can not add typedef '" + typeName
                    + "': typedef with same name already declared at line " + addedTypedef.getLine());
        }
        addedTypedefs.add(type);
    }

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

    @Override
    public void setPath(final SchemaPath path) {
        this.schemaPath = path;
    }

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

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

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

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

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

    @Override
    public void setStatus(final Status status) {
        this.status = Preconditions.checkNotNull(status, "status cannot be null");
    }

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

    @Override
    public void setAddedByUses(final boolean addedByUses) {
        this.addedByUses = addedByUses;
    }

    @Override
    public String toString() {
        return "grouping " + qname.getLocalName();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((getParent() == null) ? 0 : getParent().hashCode());
        result = prime * result + ((schemaPath == null) ? 0 : schemaPath.hashCode());
        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;
        }
        if (!super.equals(obj)) {
            return false;
        }
        final GroupingBuilderImpl other = (GroupingBuilderImpl) obj;
        if (getParent() == null) {
            if (other.getParent() != null) {
                return false;
            }
        } else if (!getParent().equals(other.getParent())) {
            return false;
        }
        if (schemaPath == null) {
            if (other.schemaPath != null) {
                return false;
            }
        } else if (!schemaPath.equals(other.schemaPath)) {
            return false;
        }
        return true;
    }

    private static final class GroupingDefinitionImpl implements GroupingDefinition {
        private final QName qname;
        private final SchemaPath path;
        private String description;
        private String reference;
        private Status status;
        private boolean addedByUses;
        private ImmutableSet<DataSchemaNode> childNodes;
        private ImmutableSet<GroupingDefinition> groupings;
        private ImmutableSet<TypeDefinition<?>> typeDefinitions;
        private ImmutableSet<UsesNode> uses;
        private ImmutableList<UnknownSchemaNode> unknownNodes;

        private GroupingDefinitionImpl(final QName qname, final SchemaPath path) {
            this.qname = qname;
            this.path = path;
        }

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

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

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

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

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

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

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

        @Override
        public Set<GroupingDefinition> getGroupings() {
            return groupings;
        }

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

        @Override
        public Set<TypeDefinition<?>> getTypeDefinitions() {
            return typeDefinitions;
        }

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

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

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

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((qname == null) ? 0 : qname.hashCode());
            result = prime * result + ((path == null) ? 0 : path.hashCode());
            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;
            }
            final GroupingDefinitionImpl other = (GroupingDefinitionImpl) obj;
            if (qname == null) {
                if (other.qname != null) {
                    return false;
                }
            } else if (!qname.equals(other.qname)) {
                return false;
            }
            if (path == null) {
                if (other.path != null) {
                    return false;
                }
            } else if (!path.equals(other.path)) {
                return false;
            }
            return true;
        }

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

}