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package org.gvsig.fmap.dal.feature.impl;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Iterator;

import java.util.List;

import org.gvsig.fmap.dal.DataTypes;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.dal.feature.spi.FeatureProvider;

import org.gvsig.fmap.dal.feature.spi.FeatureReferenceProviderServices;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.persistence.PersistenceManager;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.PersistentState;

import org.gvsig.tools.persistence.exception.PersistenceException;

public class DefaultFeatureReference implements

                FeatureReferenceProviderServices, Persistent {

        private Object oid;

        private Integer myHashCode = null;

        private Object[] pk;

        private String[] pkNames;

        private WeakReference storeRef;

        private boolean isNewFeature;

        private String featureTypeId;

        /**

     * Constructor used by the persistence manager. Don't use directly.

     * After to invoke this method, the persistence manager calls 

     * the the method {@link #loadFromState(PersistentState)} to set 

     * the values of the internal attributes that this class needs to work.

     */

        public DefaultFeatureReference() {

                super();                

        }

        public DefaultFeatureReference(DefaultFeature feature) {

                this(feature.getStore(), feature.getData());

        }

        public DefaultFeatureReference(FeatureStore store,

                        FeatureProvider fdata) {

                this.isNewFeature = fdata.isNew();

                this.oid = null;

                this.pk = null;

                this.storeRef = new WeakReference(store);

                this.featureTypeId = fdata.getType().getId();

                if (fdata.getType().hasOID() || isNewFeature) {

                        this.oid = fdata.getOID();

                        if (this.oid == null) {

                                // FIXME Exception

                                throw new RuntimeException("Missing OID");

                        }

                } else {

                        this.calculatePK(fdata);

                        if (this.pk == null) {

                                // FIXME Exception

                                throw new RuntimeException("Missing pk attributes");

                        }

                }

        }

        /*

         * Use only for Persistent.setState

         */

        public DefaultFeatureReference(FeatureStore store) {

                this.isNewFeature = false;

                this.oid = null;

                this.pk = null;

                this.storeRef = new WeakReference(store);

        }

        public DefaultFeatureReference(FeatureStore store, Object oid) {

                // FIXME featureTypeId is needed !!!

                this.isNewFeature = false;

                this.oid = oid;

                this.pk = null;

                this.storeRef = new WeakReference(store);

        }

        private DefaultFeatureStore getStore() {

                return (DefaultFeatureStore) this.storeRef.get();

        }

        private void calculatePK(FeatureProvider fdata) {

                ArrayList keys = new ArrayList();

                ArrayList keyNames = new ArrayList();

                FeatureType type = fdata.getType();

                Iterator it = type.iterator();

                while (it.hasNext()) {

                        FeatureAttributeDescriptor attr = (FeatureAttributeDescriptor) it

                                        .next();

                        if (attr.isPrimaryKey()) {

                                keys.add(fdata.get(attr.getIndex()));

                                keyNames.add(attr.getName());

                        }

                }

                if (keys.size() < 1) {

                        pk = null;

                        pkNames = null;

                } else {

                        pk = keys.toArray();

                        pkNames = (String[]) keyNames.toArray(new String[0]);

                }

        }

        public Feature getFeature() throws DataException {

                return this.getStore().getFeatureByReference(this);

        }

        public Feature getFeature(FeatureType featureType) throws DataException {

                return this.getStore().getFeatureByReference(this, featureType);

        }

        public Object getOID() {

                return this.oid;

        }

        public boolean isNewFeature() {

                return this.isNewFeature;

        }

        public boolean equals(Object obj) {

                if (!(obj instanceof DefaultFeatureReference)) {

                        return false;

                }

                DefaultFeatureReference other = (DefaultFeatureReference) obj;

                FeatureStore otherStore = (FeatureStore) other.storeRef.get();

                FeatureStore myrStore = (FeatureStore) this.storeRef.get();

                if (otherStore == null || myrStore == null) {

                        return false;

                }

                if (!myrStore.equals(otherStore)) {

                        return false;

                }

                if (myHashCode != null && other.myHashCode != null) {

                        return myHashCode.equals(other.myHashCode);

                }

                if (this.oid != null) {

                        return this.oid.equals(other.oid);

                }

                for (int i = 0; i < this.pk.length; i++) {

                        if (!this.pk[i].equals(other.pk[i])) {

                                return false;

                        }

                }

                return true;

        }

        public int hashCode() {

                if (this.oid != null) {

                        return this.oid.hashCode();

                }

                if (myHashCode == null) {

                        StringBuffer buff = new StringBuffer();

                        for (int i = 0; i < this.pk.length; i++) {

                                buff.append(this.pk[i].hashCode());

                                buff.append("##");

                        }

                        myHashCode = new Integer(buff.toString().hashCode());

                }

                return myHashCode.intValue();

        }

        public String[] getKeyNames() {

                return pkNames;

        }

        public Object getKeyValue(String name) {

                for (int i = 0; i < pkNames.length; i++) {

                        if (pkNames[i].equalsIgnoreCase(name)) {

                                return pk[i];

                        }

                }

                // FIXME exception????

                return null;

        }

        public String getFeatureTypeId() {

                return featureTypeId;

        }

        // *** Persistence ***

        public void loadFromState(PersistentState state)

                        throws PersistenceException {

                this.oid = state.get("oid");

                this.myHashCode = (Integer) state.get("myHashCode");

                this.storeRef = new WeakReference(state.get("store"));

                this.isNewFeature = state.getBoolean("isNewFeature");

                this.featureTypeId = state.getString("featureTypeId");

                List pkList = (List) state.get("pk");

                if (pkList != null) {

                        List pkNamesList = (List) state.get("pkNames");

                        if (pkNamesList == null || pkList.size() != pkNamesList.size()) {

                                throw new PersistenceException("bad pkNames value");

                        }

                        this.pk = pkList.toArray();

                        this.pkNames = (String[]) pkNamesList.toArray();

                } else {

                        this.pk = null;

                        this.pkNames = null;

                }

        }

        public void saveToState(PersistentState state) throws PersistenceException {

                state.set("oid", oid);

                state.set("myHashCode", myHashCode);

                state.set("isNewFeature", isNewFeature);

                state.set("store", (Persistent) storeRef.get());

                state.set("featureTypeId", featureTypeId);

                if (pk == null) {

                        state.set("pk", (List) null);

                        state.set("pkNames", (List) null);

                } else {

                        state.set("pk", Arrays.asList(pk));

                        state.set("pkNames", Arrays.asList(pkNames));

                }

        }

        public static void registerPersistent() {

                DynStruct definition = ToolsLocator.getPersistenceManager().addDefinition(

                                DefaultFeatureReference.class, 

                                "Reference", 

                                "DefaultFeatureReference Persistent definition", 

                                null, 

                                null

                        );

                definition.addDynField("oid")

                        .setType(DataTypes.OBJECT)

                        .setMandatory(true)

                        .setPersistent(true);

                definition.addDynField("isNewFeature")

                        .setType(DataTypes.BOOLEAN)

                        .setMandatory(true)

                        .setPersistent(true);

                definition.addDynField("store")

                        .setType(DataTypes.OBJECT)

                        .setSubtype("DataStore")

                        .setClassOfValue(FeatureStore.class)

                        .setMandatory(true)

                        .setPersistent(true);

                definition.addDynField("myHashCode")

                        .setType(DataTypes.OBJECT)

                        .setSubtype("Integer")

                        .setClassOfValue(Integer.class)

                        .setMandatory(true)

                        .setPersistent(true);

                definition.addDynField("featureTypeId")

                        .setType(DataTypes.STRING)

                        .setMandatory(true)

                        .setPersistent(true);

                definition.addDynField("ok")

                        .setType(DataTypes.LIST)

                        .setMandatory(false)

                        .setPersistent(true);

                definition.addDynField("pkNames")

                        .setType(DataTypes.STRING)

                        .setMandatory(true)

                        .setPersistent(true);

        }

}