/**
 *
 * Copyright the original author or authors
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
 *
 * 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.jivesoftware.smackx.pubsub;

import java.util.ArrayList;
import java.util.List;

import org.jivesoftware.smackx.xdata.Form;
import org.jivesoftware.smackx.xdata.FormField;
import org.jivesoftware.smackx.xdata.packet.DataForm;

/**
 * A decorator for a {@link Form} to easily enable reading and updating
 * of node configuration.  All operations read or update the underlying {@link DataForm}.
 * 
 * <p>Unlike the {@link Form}.setAnswer(XXX)} methods, which throw an exception if the field does not
 * exist, all <b>ConfigureForm.setXXX</b> methods will create the field in the wrapped form
 * if it does not already exist. 
 * 
 * @author Robin Collier
 */
public class ConfigureForm extends Form
{
        /**
         * Create a decorator from an existing {@link DataForm} that has been
         * retrieved from parsing a node configuration request.
         * 
         * @param configDataForm
         */
        public ConfigureForm(DataForm configDataForm)
        {
                super(configDataForm);
        }
        
        /**
         * Create a decorator from an existing {@link Form} for node configuration.
         * Typically, this can be used to create a decorator for an answer form
         * by using the result of {@link #createAnswerForm()} as the input parameter.
         * 
         * @param nodeConfigForm
         */
        public ConfigureForm(Form nodeConfigForm)
        {
                super(nodeConfigForm.getDataFormToSend());
        }
        
        /**
         * Create a new form for configuring a node.  This would typically only be used 
         * when creating and configuring a node at the same time via {@link PubSubManager#createNode(String, Form)}, since 
         * configuration of an existing node is typically accomplished by calling {@link LeafNode#getNodeConfiguration()} and
         * using the resulting form to create a answer form.  See {@link #ConfigureForm(Form)}.
         * @param formType
         */
        public ConfigureForm(FormType formType)
        {
                super(formType.toString());
        }
        
        /**
         * Get the currently configured {@link AccessModel}, null if it is not set.
         * 
         * @return The current {@link AccessModel}
         */
        public AccessModel getAccessModel()
        {
                String value = getFieldValue(ConfigureNodeFields.access_model);
                
                if (value == null)
                        return null;
                else
                        return AccessModel.valueOf(value);
        }
        
        /**
         * Sets the value of access model.
         * 
         * @param accessModel
         */
        public void setAccessModel(AccessModel accessModel)
        {
                addField(ConfigureNodeFields.access_model, FormField.TYPE_LIST_SINGLE);
                setAnswer(ConfigureNodeFields.access_model.getFieldName(), getListSingle(accessModel.toString()));
        }

        /**
         * Returns the URL of an XSL transformation which can be applied to payloads in order to 
         * generate an appropriate message body element.
         * 
         * @return URL to an XSL
         */
        public String getBodyXSLT()
        {
                return getFieldValue(ConfigureNodeFields.body_xslt);
        }

        /**
         * Set the URL of an XSL transformation which can be applied to payloads in order to 
         * generate an appropriate message body element.
         * 
         * @param bodyXslt The URL of an XSL
         */
        public void setBodyXSLT(String bodyXslt)
        {
                addField(ConfigureNodeFields.body_xslt, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.body_xslt.getFieldName(), bodyXslt);
        }
        
        /**
         * The id's of the child nodes associated with a collection node (both leaf and collection).
         * 
         * @return list of child nodes.
         */
        public List<String> getChildren()
        {
                return getFieldValues(ConfigureNodeFields.children);
        }
        
        /**
         * Set the list of child node ids that are associated with a collection node.
         * 
         * @param children
         */
        public void setChildren(List<String> children)
        {
                addField(ConfigureNodeFields.children, FormField.TYPE_TEXT_MULTI);
                setAnswer(ConfigureNodeFields.children.getFieldName(), children);
        }
        
        /**
         * Returns the policy that determines who may associate children with the node.
         *  
         * @return The current policy
         */
        public ChildrenAssociationPolicy getChildrenAssociationPolicy()
        {
                String value = getFieldValue(ConfigureNodeFields.children_association_policy);
                
                if (value == null)
                        return null;
                else
                        return ChildrenAssociationPolicy.valueOf(value);
        }
        
        /**
         * Sets the policy that determines who may associate children with the node.
         * 
         * @param policy The policy being set
         */
        public void setChildrenAssociationPolicy(ChildrenAssociationPolicy policy)
        {
                addField(ConfigureNodeFields.children_association_policy, FormField.TYPE_LIST_SINGLE);
        List<String> values = new ArrayList<String>(1);
        values.add(policy.toString());
        setAnswer(ConfigureNodeFields.children_association_policy.getFieldName(), values);
        }
        
        /**
         * List of JID's that are on the whitelist that determines who can associate child nodes 
         * with the collection node.  This is only relevant if {@link #getChildrenAssociationPolicy()} is set to
         * {@link ChildrenAssociationPolicy#whitelist}.
         * 
         * @return List of the whitelist
         */
        public List<String> getChildrenAssociationWhitelist()
        {
                return getFieldValues(ConfigureNodeFields.children_association_whitelist);
        }
        
        /**
         * Set the JID's in the whitelist of users that can associate child nodes with the collection 
         * node.  This is only relevant if {@link #getChildrenAssociationPolicy()} is set to
         * {@link ChildrenAssociationPolicy#whitelist}.
         * 
         * @param whitelist The list of JID's
         */
        public void setChildrenAssociationWhitelist(List<String> whitelist)
        {
                addField(ConfigureNodeFields.children_association_whitelist, FormField.TYPE_JID_MULTI);
                setAnswer(ConfigureNodeFields.children_association_whitelist.getFieldName(), whitelist);
        }

        /**
         * Gets the maximum number of child nodes that can be associated with the collection node.
         * 
         * @return The maximum number of child nodes
         */
        public int getChildrenMax()
        {
                return Integer.parseInt(getFieldValue(ConfigureNodeFields.children_max));
        }

        /**
         * Set the maximum number of child nodes that can be associated with a collection node.
         * 
         * @param max The maximum number of child nodes.
         */
        public void setChildrenMax(int max)
        {
                addField(ConfigureNodeFields.children_max, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.children_max.getFieldName(), max);
        }

        /**
         * Gets the collection node which the node is affiliated with.
         * 
         * @return The collection node id
         */
        public String getCollection()
        {
                return getFieldValue(ConfigureNodeFields.collection);
        }

        /**
         * Sets the collection node which the node is affiliated with.
         * 
         * @param collection The node id of the collection node
         */
        public void setCollection(String collection)
        {
                addField(ConfigureNodeFields.collection, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.collection.getFieldName(), collection);
        }

        /**
         * Gets the URL of an XSL transformation which can be applied to the payload
         * format in order to generate a valid Data Forms result that the client could
         * display using a generic Data Forms rendering engine.
         * 
         * @return The URL of an XSL transformation
         */
        public String getDataformXSLT()
        {
                return getFieldValue(ConfigureNodeFields.dataform_xslt);
        }

        /**
         * Sets the URL of an XSL transformation which can be applied to the payload
         * format in order to generate a valid Data Forms result that the client could
         * display using a generic Data Forms rendering engine.
         * 
         * @param url The URL of an XSL transformation
         */
        public void setDataformXSLT(String url)
        {
                addField(ConfigureNodeFields.dataform_xslt, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.dataform_xslt.getFieldName(), url);
        }

        /**
         * Does the node deliver payloads with event notifications.
         * 
         * @return true if it does, false otherwise
         */
        public boolean isDeliverPayloads()
        {
                return parseBoolean(getFieldValue(ConfigureNodeFields.deliver_payloads));
        }
        
        /**
         * Sets whether the node will deliver payloads with event notifications.
         * 
         * @param deliver true if the payload will be delivered, false otherwise
         */
        public void setDeliverPayloads(boolean deliver)
        {
                addField(ConfigureNodeFields.deliver_payloads, FormField.TYPE_BOOLEAN);
                setAnswer(ConfigureNodeFields.deliver_payloads.getFieldName(), deliver);
        }

        /**
         * Determines who should get replies to items
         * 
         * @return Who should get the reply
         */
        public ItemReply getItemReply()
        {
                String value = getFieldValue(ConfigureNodeFields.itemreply);
                
                if (value == null)
                        return null;
                else
                        return ItemReply.valueOf(value);
        }

        /**
         * Sets who should get the replies to items
         * 
         * @param reply Defines who should get the reply
         */
        public void setItemReply(ItemReply reply)
        {
                addField(ConfigureNodeFields.itemreply, FormField.TYPE_LIST_SINGLE);
                setAnswer(ConfigureNodeFields.itemreply.getFieldName(), getListSingle(reply.toString()));
        }

        /**
         * Gets the maximum number of items to persisted to this node if {@link #isPersistItems()} is
         * true.
         * 
         * @return The maximum number of items to persist
         */
        public int getMaxItems()
        {
                return Integer.parseInt(getFieldValue(ConfigureNodeFields.max_items));
        }

        /**
         * Set the maximum number of items to persisted to this node if {@link #isPersistItems()} is
         * true.
         * 
         * @param max The maximum number of items to persist
         */
        public void setMaxItems(int max)
        {
                addField(ConfigureNodeFields.max_items, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.max_items.getFieldName(), max);
        }
        
        /**
         * Gets the maximum payload size in bytes.
         * 
         * @return The maximum payload size
         */
        public int getMaxPayloadSize()
        {
                return Integer.parseInt(getFieldValue(ConfigureNodeFields.max_payload_size));
        }

        /**
         * Sets the maximum payload size in bytes
         * 
         * @param max The maximum payload size
         */
        public void setMaxPayloadSize(int max)
        {
                addField(ConfigureNodeFields.max_payload_size, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.max_payload_size.getFieldName(), max);
        }
        
        /**
         * Gets the node type
         * 
         * @return The node type
         */
        public NodeType getNodeType()
        {
                String value = getFieldValue(ConfigureNodeFields.node_type);
                
                if (value == null)
                        return null;
                else
                        return NodeType.valueOf(value);
        }
        
        /**
         * Sets the node type
         * 
         * @param type The node type
         */
        public void setNodeType(NodeType type)
        {
                addField(ConfigureNodeFields.node_type, FormField.TYPE_LIST_SINGLE);
                setAnswer(ConfigureNodeFields.node_type.getFieldName(), getListSingle(type.toString()));
        }

        /**
         * Determines if subscribers should be notified when the configuration changes.
         * 
         * @return true if they should be notified, false otherwise
         */
        public boolean isNotifyConfig()
        {
                return parseBoolean(getFieldValue(ConfigureNodeFields.notify_config));
        }
        
        /**
         * Sets whether subscribers should be notified when the configuration changes.
         * 
         * @param notify true if subscribers should be notified, false otherwise
         */
        public void setNotifyConfig(boolean notify)
        {
                addField(ConfigureNodeFields.notify_config, FormField.TYPE_BOOLEAN);
                setAnswer(ConfigureNodeFields.notify_config.getFieldName(), notify);
        }

        /**
         * Determines whether subscribers should be notified when the node is deleted.
         * 
         * @return true if subscribers should be notified, false otherwise
         */
        public boolean isNotifyDelete()
        {
                return parseBoolean(getFieldValue(ConfigureNodeFields.notify_delete));
        }
        
        /**
         * Sets whether subscribers should be notified when the node is deleted.
         * 
         * @param notify true if subscribers should be notified, false otherwise
         */
        public void setNotifyDelete(boolean notify) 
        {
                addField(ConfigureNodeFields.notify_delete, FormField.TYPE_BOOLEAN);
                setAnswer(ConfigureNodeFields.notify_delete.getFieldName(), notify);
        }

        /**
         * Determines whether subscribers should be notified when items are deleted 
         * from the node.
         * 
         * @return true if subscribers should be notified, false otherwise
         */
        public boolean isNotifyRetract()
        {
                return parseBoolean(getFieldValue(ConfigureNodeFields.notify_retract));
        }
        
        /**
         * Sets whether subscribers should be notified when items are deleted 
         * from the node.
         * 
         * @param notify true if subscribers should be notified, false otherwise
         */
        public void setNotifyRetract(boolean notify) 
        {
                addField(ConfigureNodeFields.notify_retract, FormField.TYPE_BOOLEAN);
                setAnswer(ConfigureNodeFields.notify_retract.getFieldName(), notify);
        }
        
        /**
         * Determines whether items should be persisted in the node.
         * 
         * @return true if items are persisted
         */
        public boolean isPersistItems()
        {
                return parseBoolean(getFieldValue(ConfigureNodeFields.persist_items));
        }
        
        /**
         * Sets whether items should be persisted in the node.
         * 
         * @param persist true if items should be persisted, false otherwise
         */
        public void setPersistentItems(boolean persist) 
        {
                addField(ConfigureNodeFields.persist_items, FormField.TYPE_BOOLEAN);
                setAnswer(ConfigureNodeFields.persist_items.getFieldName(), persist);
        }

        /**
         * Determines whether to deliver notifications to available users only.
         * 
         * @return true if users must be available
         */
        public boolean isPresenceBasedDelivery()
        {
                return parseBoolean(getFieldValue(ConfigureNodeFields.presence_based_delivery));
        }
        
        /**
         * Sets whether to deliver notifications to available users only.
         * 
         * @param presenceBased true if user must be available, false otherwise
         */
        public void setPresenceBasedDelivery(boolean presenceBased) 
        {
                addField(ConfigureNodeFields.presence_based_delivery, FormField.TYPE_BOOLEAN);
                setAnswer(ConfigureNodeFields.presence_based_delivery.getFieldName(), presenceBased);
        }

        /**
         * Gets the publishing model for the node, which determines who may publish to it.
         * 
         * @return The publishing model
         */
        public PublishModel getPublishModel()
        {
                String value = getFieldValue(ConfigureNodeFields.publish_model);
                
                if (value == null)
                        return null;
                else
                        return PublishModel.valueOf(value);
        }

        /**
         * Sets the publishing model for the node, which determines who may publish to it.
         * 
         * @param publish The enum representing the possible options for the publishing model
         */
        public void setPublishModel(PublishModel publish) 
        {
                addField(ConfigureNodeFields.publish_model, FormField.TYPE_LIST_SINGLE);
                setAnswer(ConfigureNodeFields.publish_model.getFieldName(), getListSingle(publish.toString()));
        }
        
        /**
         * List of the multi user chat rooms that are specified as reply rooms.
         * 
         * @return The reply room JID's
         */
        public List<String> getReplyRoom()
        {
                return getFieldValues(ConfigureNodeFields.replyroom);
        }
        
        /**
         * Sets the multi user chat rooms that are specified as reply rooms.
         * 
         * @param replyRooms The multi user chat room to use as reply rooms
         */
        public void setReplyRoom(List<String> replyRooms) 
        {
                addField(ConfigureNodeFields.replyroom, FormField.TYPE_LIST_MULTI);
                setAnswer(ConfigureNodeFields.replyroom.getFieldName(), replyRooms);
        }
        
        /**
         * Gets the specific JID's for reply to.
         *  
         * @return The JID's
         */
        public List<String> getReplyTo()
        {
                return getFieldValues(ConfigureNodeFields.replyto);
        }
        
        /**
         * Sets the specific JID's for reply to.
         * 
         * @param replyTos The JID's to reply to
         */
        public void setReplyTo(List<String> replyTos)
        {
                addField(ConfigureNodeFields.replyto, FormField.TYPE_LIST_MULTI);
                setAnswer(ConfigureNodeFields.replyto.getFieldName(), replyTos);
        }
        
        /**
         * Gets the roster groups that are allowed to subscribe and retrieve items.
         *  
         * @return The roster groups
         */
        public List<String> getRosterGroupsAllowed()
        {
                return getFieldValues(ConfigureNodeFields.roster_groups_allowed);
        }
        
        /**
         * Sets the roster groups that are allowed to subscribe and retrieve items.
         * 
         * @param groups The roster groups
         */
        public void setRosterGroupsAllowed(List<String> groups)
        {
                addField(ConfigureNodeFields.roster_groups_allowed, FormField.TYPE_LIST_MULTI);
                setAnswer(ConfigureNodeFields.roster_groups_allowed.getFieldName(), groups);
        }
        
        /**
         * Determines if subscriptions are allowed.
         * 
         * @return true if subscriptions are allowed, false otherwise
         */
        public boolean isSubscibe()
        {
                return parseBoolean(getFieldValue(ConfigureNodeFields.subscribe));
        }

        /**
         * Sets whether subscriptions are allowed.
         * 
         * @param subscribe true if they are, false otherwise
         */
        public void setSubscribe(boolean subscribe)
        {
                addField(ConfigureNodeFields.subscribe, FormField.TYPE_BOOLEAN);
                setAnswer(ConfigureNodeFields.subscribe.getFieldName(), subscribe);
        }
        
        /**
         * Gets the human readable node title.
         * 
         * @return The node title
         */
        public String getTitle()
        {
                return getFieldValue(ConfigureNodeFields.title);
        }

        /**
         * Sets a human readable title for the node.
         * 
         * @param title The node title
         */
        public void setTitle(String title) 
        {
                addField(ConfigureNodeFields.title, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.title.getFieldName(), title);
        }
        
        /**
         * The type of node data, usually specified by the namespace of the payload (if any).
         * 
         * @return The type of node data
         */
        public String getDataType()
        {
                return getFieldValue(ConfigureNodeFields.type);
        }

        /**
         * Sets the type of node data, usually specified by the namespace of the payload (if any).
         * 
         * @param type The type of node data
         */
        public void setDataType(String type) 
        {
                addField(ConfigureNodeFields.type, FormField.TYPE_TEXT_SINGLE);
                setAnswer(ConfigureNodeFields.type.getFieldName(), type);
        }
        
        @Override
        public String toString()
        {
                StringBuilder result = new StringBuilder(getClass().getName() + " Content [");
                
                for (FormField formField : getFields())
                {
                        result.append('(');
                        result.append(formField.getVariable());
                        result.append(':');
                        
                        StringBuilder valuesBuilder = new StringBuilder();
                                
                        for (String value : formField.getValues())
                        {
                                if (valuesBuilder.length() > 0)
                                        result.append(',');
                                valuesBuilder.append(value);
                        }
                        
                        if (valuesBuilder.length() == 0)
                                valuesBuilder.append("NOT SET");
                        result.append(valuesBuilder);
                        result.append(')');
                }
                result.append(']');
                return result.toString();
        }

        static private boolean parseBoolean(String fieldValue)
        {
                return ("1".equals(fieldValue) || "true".equals(fieldValue));
        }

        private String getFieldValue(ConfigureNodeFields field)
        {
                FormField formField = getField(field.getFieldName());
                
                return (formField.getValues().isEmpty()) ? null : formField.getValues().get(0);
        }

        private List<String> getFieldValues(ConfigureNodeFields field)
        {
                FormField formField = getField(field.getFieldName());
                
                return formField.getValues();
        }

        private void addField(ConfigureNodeFields nodeField, String type)
        {
                String fieldName = nodeField.getFieldName();
                
                if (getField(fieldName) == null)
                {
                        FormField field = new FormField(fieldName);
                        field.setType(type);
                        addField(field);
                }
        }

        private List<String> getListSingle(String value)
        {
                List<String> list = new ArrayList<String>(1);
                list.add(value);
                return list;
        }

}