package org.opendaylight.controller.yang.parser.builder.impl;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.opendaylight.controller.yang.common.QName;
import org.opendaylight.controller.yang.model.api.AugmentationSchema;
import org.opendaylight.controller.yang.model.api.ChoiceCaseNode;
import org.opendaylight.controller.yang.model.api.ConstraintDefinition;
import org.opendaylight.controller.yang.model.api.DataSchemaNode;
import org.opendaylight.controller.yang.model.api.GroupingDefinition;
import org.opendaylight.controller.yang.model.api.SchemaPath;
import org.opendaylight.controller.yang.model.api.Status;
import org.opendaylight.controller.yang.model.api.TypeDefinition;
import org.opendaylight.controller.yang.model.api.UnknownSchemaNode;
import org.opendaylight.controller.yang.model.api.UsesNode;
import org.opendaylight.controller.yang.parser.builder.api.AbstractChildNodeBuilder;
import org.opendaylight.controller.yang.parser.builder.api.DataSchemaNodeBuilder;
import org.opendaylight.controller.yang.parser.builder.api.TypeDefinitionBuilder;
import org.opendaylight.controller.yang.parser.builder.api.UsesNodeBuilder;
import org.opendaylight.controller.yang.parser.util.YangParseException;

public final class ChoiceCaseBuilder extends AbstractChildNodeBuilder implements
        DataSchemaNodeBuilder {
    private final ChoiceCaseNodeImpl instance;
    private final int line;
    private SchemaPath schemaPath;
    private String description;
    private String reference;
    private Status status = Status.CURRENT;
    private final List<UnknownSchemaNodeBuilder> addedUnknownNodes = new ArrayList<UnknownSchemaNodeBuilder>();
    private boolean augmenting;
    private final ConstraintsBuilder constraints;
    private final Set<UsesNodeBuilder> addedUsesNodes = new HashSet<UsesNodeBuilder>();
    private final Set<AugmentationSchema> augmentations = new HashSet<AugmentationSchema>();

    ChoiceCaseBuilder(final QName qname, final int line) {
        super(qname);
        this.line = line;
        instance = new ChoiceCaseNodeImpl(qname);
        constraints = new ConstraintsBuilder(line);
    }

    @Override
    public ChoiceCaseNode build() {
        instance.setConstraints(constraints.build());
        instance.setPath(schemaPath);
        instance.setDescription(description);
        instance.setReference(reference);
        instance.setStatus(status);
        instance.setAugmenting(augmenting);
        instance.setAvailableAugmentations(augmentations);

        // CHILD NODES
        final Map<QName, DataSchemaNode> childs = new HashMap<QName, DataSchemaNode>();
        for (DataSchemaNodeBuilder node : childNodes) {
            childs.put(node.getQName(), node.build());
        }
        instance.setChildNodes(childs);

        // USES
        final Set<UsesNode> uses = new HashSet<UsesNode>();
        for (UsesNodeBuilder builder : addedUsesNodes) {
            uses.add(builder.build());
        }
        instance.setUses(uses);

        // UNKNOWN NODES
        final List<UnknownSchemaNode> unknownNodes = new ArrayList<UnknownSchemaNode>();
        for (UnknownSchemaNodeBuilder b : addedUnknownNodes) {
            unknownNodes.add(b.build());
        }
        instance.setUnknownSchemaNodes(unknownNodes);

        return instance;
    }

    @Override
    public int getLine() {
        return line;
    }

    public SchemaPath getPath() {
        return schemaPath;
    }

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

    public String getDescription() {
        return description;
    }

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

    public String getReference() {
        return reference;
    }

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

    public Status getStatus() {
        return status;
    }

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

    public boolean isAugmenting() {
        return augmenting;
    }

    @Override
    public void setAugmenting(boolean augmenting) {
        this.augmenting = augmenting;
    }

    public List<UnknownSchemaNodeBuilder> getUnknownNodes() {
        return addedUnknownNodes;
    }

    @Override
    public void addUnknownSchemaNode(UnknownSchemaNodeBuilder unknownNode) {
        addedUnknownNodes.add(unknownNode);
    }

    public Set<UsesNodeBuilder> getUsesNodes() {
        return addedUsesNodes;
    }

    @Override
    public void addUsesNode(UsesNodeBuilder usesNodeBuilder) {
        addedUsesNodes.add(usesNodeBuilder);
    }

    @Override
    public void addTypedef(TypeDefinitionBuilder typedefBuilder) {
        throw new YangParseException(line,
                "Can not add type definition to choice case.");
    }

    @Override
    public void setConfiguration(boolean configuration) {
        throw new YangParseException(line,
                "Can not add config definition to choice case.");
    }

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

    public Set<AugmentationSchema> getAugmentations() {
        return augmentations;
    }

    private final class ChoiceCaseNodeImpl implements ChoiceCaseNode {
        private final QName qname;
        private SchemaPath path;
        private String description;
        private String reference;
        private Status status = Status.CURRENT;
        private boolean augmenting;
        private ConstraintDefinition constraints;
        private Map<QName, DataSchemaNode> childNodes = Collections.emptyMap();
        private Set<AugmentationSchema> augmentations = Collections.emptySet();
        private Set<UsesNode> uses = Collections.emptySet();
        private List<UnknownSchemaNode> unknownNodes = Collections.emptyList();

        private ChoiceCaseNodeImpl(QName qname) {
            this.qname = qname;
        }

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

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

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

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

        private void setDescription(String description) {
            this.description = description;
        }

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

        private void setReference(String reference) {
            this.reference = reference;
        }

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

        private void setStatus(Status status) {
            if (status != null) {
                this.status = status;
            }
        }

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

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

        private void setConstraints(ConstraintDefinition constraints) {
            this.constraints = constraints;
        }

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

        private void setAugmenting(boolean augmenting) {
            this.augmenting = augmenting;
        }

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

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

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

        @Override
        public Set<DataSchemaNode> getChildNodes() {
            return new HashSet<DataSchemaNode>(childNodes.values());
        }

        private void setChildNodes(Map<QName, DataSchemaNode> childNodes) {
            if (childNodes != null) {
                this.childNodes = childNodes;
            }
        }

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

        @Override
        public DataSchemaNode getDataChildByName(QName name) {
            return childNodes.get(name);
        }

        @Override
        public DataSchemaNode getDataChildByName(String name) {
            DataSchemaNode result = null;
            for (Map.Entry<QName, DataSchemaNode> entry : childNodes.entrySet()) {
                if (entry.getKey().getLocalName().equals(name)) {
                    result = entry.getValue();
                    break;
                }
            }
            return result;
        }

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

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

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

        private void setAvailableAugmentations(
                Set<AugmentationSchema> augmentations) {
            if (augmentations != null) {
                this.augmentations = augmentations;
            }
        }

        @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(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj == null) {
                return false;
            }
            if (getClass() != obj.getClass()) {
                return false;
            }
            ChoiceCaseNodeImpl other = (ChoiceCaseNodeImpl) 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(
                    ChoiceCaseNodeImpl.class.getSimpleName());
            sb.append("[");
            sb.append("qname=" + qname);
            sb.append("]");
            return sb.toString();
        }
    }

}