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

import java.util.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

import java.util.ListIterator;

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

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

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

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

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

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

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

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

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

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.PersistentState;

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

public class DefaultFeatureStoreTransforms implements FeatureStoreTransforms,

                Persistent {

        private DefaultFeatureStore store;

        private List transforms;

        private Boolean isTramsformValues;

        private TransformTemporalList lastTransformStack;

        public DefaultFeatureStoreTransforms() {

                this.store = null;

                this.transforms = new ArrayList();

                this.isTramsformValues = Boolean.FALSE;

        }

        public DefaultFeatureStoreTransforms(DefaultFeatureStore store) {

                this.store = store;

                this.transforms = new ArrayList();

        }

        protected void checkEditingMode() {

                if (store == null || store.getMode() != FeatureStore.MODE_QUERY) {

                        throw new IllegalStateException();

                }

        }

        protected void notifyChangeToStore() {

                this.store.notifyChange(FeatureStoreNotification.TRANSFORM_CHANGE);

        }

        public FeatureStoreTransform add(FeatureStoreTransform transform)

                        throws DataException {

                checkEditingMode();

                if (transform.getDefaultFeatureType()!=null){

                        if( ! transform.getFeatureTypes().contains(transform.getDefaultFeatureType())) {

                                throw new IllegalArgumentException(); // FIXME: A?adir tipo especifico.

                        }

                        this.transforms.add(transform);

                        this.notifyChangeToStore();

                        if (this.isTramsformValues == null

                                        || (!this.isTramsformValues.booleanValue())) {

                                if (transform.isTransformsOriginalValues()) {

                                        this.isTramsformValues = Boolean.TRUE;

                                }

                        }

                }

                return transform;

        }

        public void clear() {

                checkEditingMode();

                this.transforms.clear();

                this.notifyChangeToStore();

                this.isTramsformValues = Boolean.FALSE;

        }

        public FeatureStoreTransform getTransform(int index) {

                return (FeatureStoreTransform) this.transforms.get(index);

        }

        public Iterator iterator() {

                return Collections.unmodifiableList(transforms).iterator();

        }

        public Object remove(int index) {

                checkEditingMode();

                Object trans = this.transforms.remove(index);

                this.notifyChangeToStore();

                this.isTramsformValues = null;

                return trans;

        }

        public boolean remove(FeatureStoreTransform transform) {

                checkEditingMode();

                boolean removed = this.transforms.remove(transform);

                if (removed) {

                        this.notifyChangeToStore();

                }

                this.isTramsformValues = null;

                return removed;

        }

        public int size() {

                return this.transforms.size();

        }

        public boolean isEmpty() {

                return this.transforms.isEmpty();

        }

        private class TransformTemporalListElement {

                public FeatureStoreTransform transform = null;

                public FeatureType targetFeatureType = null;

        }

        private class TransformTemporalList extends ArrayList {

                private FeatureType targetFType;

                public boolean add(Object arg0) {

                        if (this.isEmpty()) {

                                targetFType = ((TransformTemporalListElement) arg0).targetFeatureType;

                        }

                        return super.add(arg0);

                }

        }

        protected TransformTemporalList getTransformTemporalList(

                        FeatureType targetFeatureType) {

                if (this.lastTransformStack == null

                                || this.lastTransformStack.size() != this.transforms.size()

                                || !(this.lastTransformStack.targetFType

                                                .equals(targetFeatureType))) {

                        TransformTemporalList result = new TransformTemporalList();

                        TransformTemporalListElement item;

                        FeatureType nextFType = targetFeatureType;

                        for (int i = transforms.size() - 1; i > -1; i--) {

                                item = new TransformTemporalListElement();

                                item.transform = (FeatureStoreTransform) transforms.get(i);

                                item.targetFeatureType = nextFType;

                                nextFType = item.transform

                                                .getSourceFeatureTypeFrom(item.targetFeatureType);

                                result.add(item);

                        }

                        this.lastTransformStack = result;

                }

                return this.lastTransformStack;

        }

        public Feature applyTransform(DefaultFeature source,

                        FeatureType targetFeatureType)

                        throws DataException {

                if (this.transforms.isEmpty()) {

                        return source;

                }

                TransformTemporalList stack = this

                                .getTransformTemporalList(targetFeatureType);

                TransformTemporalListElement item;

                FeatureProvider targetData;

                EditableFeature target;

                ListIterator iterator = stack.listIterator(stack.size());

                while (iterator.hasPrevious()) {

                        item = (TransformTemporalListElement) iterator.previous();

                        targetData = this.store

                                        .createDefaultFeatureProvider(item.targetFeatureType);

                        targetData.setOID(source.getData().getOID());

                        targetData.setNew(false);

                        target = (new DefaultEditableFeature(this.store, targetData))

                                        .getEditable();

                        item.transform.applyTransform(source, target);

                         source = (DefaultFeature) target.getNotEditableCopy();

                }

                return source;

        }

        public FeatureType getSourceFeatureTypeFrom(FeatureType targetFeatureType) {

                FeatureType tmpFType = targetFeatureType;

                for (int i = transforms.size() - 1; i > -1; i--) {

                        FeatureStoreTransform transform = (FeatureStoreTransform) transforms

                                        .get(i);

                        tmpFType = transform.getSourceFeatureTypeFrom(tmpFType);

                }

                return tmpFType;

        }

        public FeatureType getDefaultFeatureType() throws DataException {

                if (this.transforms.isEmpty()) {

                        return null;

                }

                FeatureStoreTransform transform = (FeatureStoreTransform) this.transforms

                                .get(this.transforms.size() - 1);

                return transform.getDefaultFeatureType();

        }

        public List getFeatureTypes() throws DataException {

                if (this.transforms.isEmpty()) {

                        return null;

                }

                FeatureStoreTransform transform = (FeatureStoreTransform) this.transforms

                                .get(this.transforms.size() - 1);

                return transform.getFeatureTypes();

        }

        public FeatureStore getFeatureStore() {

                return this.store;

        }

        public void setFeatureStore(FeatureStore featureStore) {

                if (this.store != null) {

                        throw new IllegalStateException();// FIXME: A?adir tipo especifico.

                }

                this.store = (DefaultFeatureStore) featureStore;

        }

        public boolean isTransformsOriginalValues() {

                if (this.isTramsformValues == null) {

                        Iterator iter = this.transforms.iterator();

                        FeatureStoreTransform transform;

                        this.isTramsformValues = Boolean.FALSE;

                        while (iter.hasNext()) {

                                transform = (FeatureStoreTransform) iter.next();

                                if (transform.isTransformsOriginalValues()){

                                        this.isTramsformValues = Boolean.TRUE;

                                        break;

                                }

                        }

                }

                return this.isTramsformValues.booleanValue();

        }

        public FeatureType getFeatureType(String featureTypeId)

                        throws DataException {

                if (this.transforms.isEmpty()) {

                        return null;

                }

                if (featureTypeId == null) {

                        return this.getDefaultFeatureType();

                }

                Iterator iter = this.getFeatureTypes().iterator();

                FeatureType fType;

                while (iter.hasNext()) {

                        fType = (FeatureType) iter.next();

                        if (fType.getId().equals(featureTypeId)) {

                                return fType;

                        }

                }

                return null;

        }

        // *** Persistence ***

        public void saveToState(PersistentState state) throws PersistenceException {

                state.set("store", store);

                state.set("isTramsformValues", this.isTramsformValues);

                state.set("transforms", this.transforms);

        }

        public void loadFromState(PersistentState state)

                        throws PersistenceException {

                this.isTramsformValues = (Boolean) state.get("isTramsformValues");

                this.transforms = (List) state.get("transforms");

                this.store = (DefaultFeatureStore) state.get("store");

        }

        public static void registerPersistent() {

                DynStruct definition = ToolsLocator.getPersistenceManager().addDefinition(

                                DefaultFeatureStoreTransforms.class, 

                                "DefaultFeatureStoreTransforms", 

                                "DefaultFeatureStoreTransforms Persistent definition",

                                null, 

                                null

                        );

                definition.addDynFieldBoolean("isTramsformValues").setMandatory(false);

                definition.addDynFieldList("transforms").setClassOfItems(FeatureStoreTransform.class).setMandatory(true);

                definition.addDynFieldObject("store").setClassOfValue(FeatureStore.class).setMandatory(true);

        }

}