/**
    * Copyright 2005-2016 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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 org.kuali.rice.krms.api.repository.context;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.CoreConstants;
  import org.kuali.rice.core.api.mo.AbstractDataTransferObject;
  import org.kuali.rice.core.api.mo.ModelBuilder;
  import org.kuali.rice.core.api.util.jaxb.MapStringStringAdapter;
  import org.kuali.rice.krms.api.KrmsConstants;
  import org.kuali.rice.krms.api.repository.agenda.AgendaDefinition;
  import org.kuali.rice.krms.api.repository.agenda.AgendaDefinitionContract;
  
  import javax.xml.bind.annotation.XmlAccessType;
  import javax.xml.bind.annotation.XmlAccessorType;
  import javax.xml.bind.annotation.XmlAnyElement;
  import javax.xml.bind.annotation.XmlElement;
  import javax.xml.bind.annotation.XmlElementWrapper;
  import javax.xml.bind.annotation.XmlRootElement;
  import javax.xml.bind.annotation.XmlType;
  import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * An immutable representation of a context definition.  A context definition
   * defines information about a context which can be loaded into the rules
   * engine for evaluation.
   * 
   * A context definition includes a list of agendas which are valid within the
   * context.  Typically, during rule engine execution, one or more of these
   * agendas is selected for execution based on a given set of selection criteria.
   *
   * @see ContextDefinitionContract
   * @author Kuali Rice Team (rice.collab@kuali.org)
   *
   */
  @XmlRootElement(name = ContextDefinition.Constants.ROOT_ELEMENT_NAME)
  @XmlAccessorType(XmlAccessType.NONE)
  @XmlType(name = ContextDefinition.Constants.TYPE_NAME, propOrder = {
  		ContextDefinition.Elements.ID,
  		ContextDefinition.Elements.NAMESPACE,
  		ContextDefinition.Elements.NAME,
          ContextDefinition.Elements.TYPE_ID,
          ContextDefinition.Elements.DESCRIPTION,
          ContextDefinition.Elements.ACTIVE,
  		ContextDefinition.Elements.AGENDAS,
  		ContextDefinition.Elements.ATTRIBUTES,
          CoreConstants.CommonElements.VERSION_NUMBER,
          CoreConstants.CommonElements.FUTURE_ELEMENTS
  })
  public final class ContextDefinition extends AbstractDataTransferObject implements ContextDefinitionContract {
  	
  	private static final long serialVersionUID = -6639428234851623868L;
  
  	@XmlElement(name = Elements.ID, required = false)
  	private final String id;
  	
  	@XmlElement(name = Elements.NAME, required = true)
      private final String name;
  	
  	@XmlElement(name = Elements.NAMESPACE, required = true)
      private final String namespace;
  	
  	@XmlElement(name = Elements.TYPE_ID, required = false)
      private final String typeId;
  	
      @XmlElement(name = Elements.DESCRIPTION, required = false)
      private final String description;
      
      @XmlElement(name = Elements.ACTIVE, required = false)
      private final boolean active;
  
  	@XmlElementWrapper(name = Elements.AGENDAS)
  	@XmlElement(name = Elements.AGENDA, required = false)
  	private final List<AgendaDefinition> agendas;
  	    
  	@XmlElement(name = Elements.ATTRIBUTES, required = false)
  	@XmlJavaTypeAdapter(value = MapStringStringAdapter.class)
  	private final Map<String, String> attributes;
  	
 	@XmlElement(name = CoreConstants.CommonElements.VERSION_NUMBER, required = false)
     private final Long versionNumber;
 	
     @SuppressWarnings("unused")
     @XmlAnyElement
     private final Collection<org.w3c.dom.Element> _futureElements = null;
 
     /**
      * Used only by JAXB.
      */
     private ContextDefinition() {
     	this.id = null;
     	this.name = null;
     	this.namespace = null;
     	this.typeId = null;
     	this.description = null;
         this.active = true;
     	this.agendas = null;
     	this.versionNumber = null;
     	this.attributes = null;
     }
 
     /**
      * Constructs a ContextDefinition from the given builder. This constructor is private
      * and should only be called by the builder
      *
      * @param builder the Builder from which to construct the context definition.
      */
     private ContextDefinition(Builder builder) {
     	this.id = builder.getId();
     	this.name = builder.getName();
     	this.namespace = builder.getNamespace();
         this.active = builder.isActive();
     	this.description = builder.getDescription();
 
     	this.typeId = builder.getTypeId();
     	this.agendas = constructAgendas(builder.getAgendas());
     	this.versionNumber = builder.getVersionNumber();
         if (builder.getAttributes() != null){
         	this.attributes = Collections.unmodifiableMap(new HashMap<String, String>(builder.getAttributes()));
         } else {
         	this.attributes = null;
         }
     }
     
     private static List<AgendaDefinition> constructAgendas(List<AgendaDefinition.Builder> agendaBuilders) {
     	List<AgendaDefinition> agendas = new ArrayList<AgendaDefinition>();
     	if (agendaBuilders != null) {
     		for (AgendaDefinition.Builder agendaBuilder : agendaBuilders) {
     			agendas.add(agendaBuilder.build());
     		}
     	}
     	return agendas;
     }
     
     @Override
 	public String getId() {
 		return id;
 	}
 
 	@Override
 	public String getNamespace() {
 		return namespace;
 	}
 
 	@Override
 	public String getName() {
 		return name;
 	}
 
 	@Override
 	public String getTypeId() {
 		return typeId;
 	}
 
     @Override
     public String getDescription() {
         return description;
     }
 	
     @Override
     public boolean isActive() {
         return this.active;
     }
 
 	@Override
 	public List<AgendaDefinition> getAgendas() {
 		return Collections.unmodifiableList(this.agendas);
 	}
 	
 	@Override
 	public Map<String, String> getAttributes() {
 		return this.attributes; 
 	}
 
 	@Override
 	public Long getVersionNumber() {
 		return versionNumber;
 	}
 	
 	/**
 	 * A builder which can be used to construct ContextDefinition instances.  Enforces the
 	 * constraints of the {@link ContextDefinitionContract}.  This class is the only means
 	 * by which a {@link ContextDefinition} object can be constructed.
 	 * 
 	 * @author Kuali Rice Team (rice.collab@kuali.org)
 	 *
 	 */
 	public static final class Builder implements ContextDefinitionContract, ModelBuilder, Serializable  {
     	
     	private static final long serialVersionUID = -219369603932108436L;
     	
 		private String id;
 		private String namespace;
         private String name;
         private String typeId;
         private String description;
         private boolean active;
         private List<AgendaDefinition.Builder> agendas;
         private Map<String, String> attributes;
         private Long versionNumber;
         
         private Builder(String namespace, String name) {
         	setNamespace(namespace);
         	setName(name);
             setActive(true);
         	setAgendas(new ArrayList<AgendaDefinition.Builder>());
             setAttributes(new HashMap<String, String>());
         }
         
         /**
          * Creates a context definition builder with the given required values
          * 
          * @param namespace the namespace code of the context definition to create, must not be null or blank
          * @param name the name of the context definition to create, must not be null or blank
          * 
          * @return a builder with the required values already initialized
          * 
          * @throws IllegalArgumentException if the given namespace is null or blank
          * @throws IllegalArgumentException if the given name is null or blank
          */
         public static Builder create(String namespace, String name) {
         	return new Builder(namespace, name);
         }
         
         /**
          * Creates a populates a builder with the data on the given ContextDefinitionContract.
          * This is similar in nature to a "copy constructor" for Style.
          * 
          * @param contract an object implementing the ContextDefinitionContract from which
          * to copy property values
          *  
          * @return a builder with the values from the contract already initialized
          * 
          * @throws IllegalArgumentException if the given contract is null
          */
         public static Builder create(ContextDefinitionContract contract) {
         	if (contract == null) {
         		throw new IllegalArgumentException("contract was null");
         	}
         	Builder builder = create(contract.getNamespace(), contract.getName());
         	builder.setId(contract.getId());
         	builder.setTypeId(contract.getTypeId());
             builder.setDescription(contract.getDescription());
             builder.setActive(contract.isActive());
         	builder.setVersionNumber(contract.getVersionNumber());
         	builder.setAgendas(contract.getAgendas());
             if (contract.getAttributes() != null) {
                 builder.setAttributes(new HashMap<String, String>(contract.getAttributes()));
             }
         	return builder;
         }
         
         @Override
         public ContextDefinition build() {
         	return new ContextDefinition(this);
         }
         
 		@Override
 		public Long getVersionNumber() {
 			return this.versionNumber;
 		}
 
 		@Override
 		public String getId() {
 			return this.id;
 		}
 
 		@Override
 		public String getNamespace() {
 			return this.namespace;
 		}
 
 		@Override
 		public String getName() {
 			return this.name;
 		}
 
 		@Override
 		public String getTypeId() {
 			return this.typeId;
 		}
 
         @Override
         public String getDescription() {
             return description;
         }
 
         @Override
         public boolean isActive() {
             return active;
         }
 
         @Override
 		public List<AgendaDefinition.Builder> getAgendas() {
 			return agendas;
 		}
 
 		@Override
 		public Map<String, String> getAttributes() {
 			return attributes;
 		}
 
 		/**
          * Sets the id for the context definition that will be created by this builder.
          * 
          * @param id the id to set
          */
 		public void setId(String id) {
 			if (id != null){
 				if (StringUtils.isBlank(id)){
 					throw new IllegalArgumentException("context id is blank");					
 				}
 			}
 			this.id = id;
 		}
 
 		/**
 		 * Sets the namespace code for the context definition that will be created
 		 * by this builder.  The namespace code must not be blank or null.
 		 * 
 		 * @param namespace the namespace to set on this builder, must not be
 		 * null or blank
 		 * 
 		 * @throws IllegalArgumentException if the given namespace code is null or blank
 		 */
 		public void setNamespace(String namespace) {
 			if (StringUtils.isBlank(namespace)) {
 				throw new IllegalArgumentException("namespace is blank");
 			}
 			this.namespace = namespace;
 		}
 
 		/**
 		 * Sets the name for the context definition that will be created
 		 * by this builder.  The name must not be blank or null.
 		 * 
 		 * @param name the name to set on this builder, must not be
 		 * null or blank
 		 * 
 		 * @throws IllegalArgumentException if the given name is null or blank
 		 */
 		public void setName(String name) {
 			if (StringUtils.isBlank(name)) {
 				throw new IllegalArgumentException("name is blank");
 			}
 			this.name = name;
 		}
 
 		/**
          * Sets the typeId for the context definition that will be created by this builder.
          * 
          * @param typeId the typeId to set
          */
 		public void setTypeId(String typeId) {
 			this.typeId = typeId;
 		}
 		
         /**
          * Sets the description for the context definition that will be created by this builder.
          *
          * @param description the descripition to set
          */
         public void setDescription(String description) {
             this.description = description;
         }
 
         /**
          * Sets the active flag for the context that will be
          * returned by this builder.
          *
          * @param active the active flag to set
          */
         public void setActive(boolean active) {
             this.active = active;
         }
 
         /**
          * Sets the agendas property of this context definition.
          * <p>For each of the {@link AgendaDefinitionContract} provided in the parameter list,
          * construct an AgendaDefinition from the builder of the provided contract, and save the agenda definitions
          * in a List of {@link AgendaDefinition}</p>
          *
          * @param agendaContracts a list of agenda definition contracts
          */
 		public void setAgendas(List<? extends AgendaDefinitionContract> agendaContracts) {
 			this.agendas = new ArrayList<AgendaDefinition.Builder>();
 			if (agendaContracts != null) for (AgendaDefinitionContract agendaContract : agendaContracts) {
 				this.agendas.add(AgendaDefinition.Builder.create(agendaContract));
 			}
 		}
 
         /**
          * Sets the Map of attributes as name / value pairs.
          *
          * @param attributes a Map of name value String pairs representing the attributes
          * associated with this context
          */
 		public void setAttributes(Map<String, String> attributes){
 			if (attributes == null){
 				this.attributes = Collections.emptyMap();
 			}
 			this.attributes = Collections.unmodifiableMap(attributes);
 		}
 		
 		/**
          * Sets the version number for the style that will be returned by this
          * builder.
          * 
          * <p>In general, this value should not be manually set on the builder,
          * but rather copied from an existing {@link ContextDefinitionContract} when
          * invoking {@link Builder#create(ContextDefinitionContract)}.
          * 
          * @param versionNumber the version number to set
          */
 		public void setVersionNumber(Long versionNumber) {
 			this.versionNumber = versionNumber;
 		}
 		
     }
 	
 	/**
      * Defines some internal constants used on this class.
      */
     public static class Constants {
         final static String ROOT_ELEMENT_NAME = "context";
         final static String TYPE_NAME = "ContextDefinitionType";
     }
 
     /**
      * A private class which exposes constants which define the XML element names to use
      * when this object is marshalled to XML.
      */
     public static class Elements {
         final static String ID = "id";
         final static String NAMESPACE = "namespace";
         final static String NAME = "name";
         final static String TYPE_ID = "typeId";
         final static String DESCRIPTION = "description";
         final static String ACTIVE = "active";
         final static String AGENDA = "agenda";
         final static String AGENDAS = "agendas";
 		final static String ATTRIBUTES = "attributes";
     }
 
     public static class Cache {
         public static final String NAME = KrmsConstants.Namespaces.KRMS_NAMESPACE_2_0 + "/" + ContextDefinition.Constants.TYPE_NAME;
     }
 	
 }