/*
 * (C) Copyright 2006-2014 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * 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.
 *
 * Contributors:
 *     Bogdan Stefanescu
 *     Florent Guillaume
 */
package org.nuxeo.ecm.core.api.model.impl;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

import org.nuxeo.common.collections.PrimitiveArrays;
import org.nuxeo.ecm.core.api.ListDiff;
import org.nuxeo.ecm.core.api.PropertyException;
import org.nuxeo.ecm.core.api.model.InvalidPropertyValueException;
import org.nuxeo.ecm.core.api.model.Property;
import org.nuxeo.ecm.core.api.model.PropertyConversionException;
import org.nuxeo.ecm.core.api.model.PropertyVisitor;
import org.nuxeo.ecm.core.api.model.ReadOnlyPropertyException;
import org.nuxeo.ecm.core.schema.types.Field;
import org.nuxeo.ecm.core.schema.types.ListType;

public class ListProperty extends AbstractProperty implements List<Property> {

    private static final long serialVersionUID = 1L;

    /**
     * The corresponding field.
     */
    protected final Field field;

    protected final List<Property> children;

    public ListProperty(Property parent, Field field) {
        super(parent);
        this.field = field;
        children = new ArrayList<Property>();
    }

    public ListProperty(Property parent, Field field, int flags) {
        super(parent, flags);
        this.field = field;
        children = new ArrayList<Property>();
    }

    @Override
    public void internalSetValue(Serializable value) throws PropertyException {
    }

    /**
     * TODO FIXME XXX uncommented <code>return true;</code> see NXP-1653.
     *
     * @see DefaultPropertyFactory line 216
     * @see {@link ListProperty#getValue}
     * @see {@link ListProperty#accept}
     */
    @Override
    public boolean isContainer() {
        // return true; // - this can be uncommented when scalar list will be
        // fixed
        return !getType().isScalarList();
    }

    @Override
    public Property addValue(int index, Object value) throws PropertyException {
        Field lfield = getType().getField();
        Property property = getRoot().createProperty(this, lfield, IS_NEW);
        property.setValue(value);
        children.add(index, property);
        return property;
    }

    @Override
    public Property addValue(Object value) throws PropertyException {
        Field lfield = getType().getField();
        Property property = getRoot().createProperty(this, lfield, IS_NEW);
        property.setValue(value);
        children.add(property);
        return property;
    }

    @Override
    public Property addEmpty() {
        Field lfield = getType().getField();
        Property property = getRoot().createProperty(this, lfield, 0);
        children.add(property);
        return property;
    }

    @Override
    public Collection<Property> getChildren() {
        return Collections.unmodifiableCollection(children);
    }

    @Override
    public String getName() {
        return field.getName().getPrefixedName();
    }

    @Override
    public ListType getType() {
        return (ListType) field.getType();
    }

    @Override
    public Property get(String name) {
        try {
            return get(Integer.parseInt(name));
        } catch (NumberFormatException e) {
            return null;
        }
    }

    @Override
    public Property get(int index) {
        try {
            return children.get(index);
        } catch (IndexOutOfBoundsException e) {
            return null;
        }
    }

    @Override
    protected Serializable getDefaultValue() {
        Serializable value = (Serializable) field.getDefaultValue();
        if (value == null) {
            value = new ArrayList<Serializable>();
        }
        return value;
    }

    @Override
    public Serializable internalGetValue() throws PropertyException {
        if (children.isEmpty()) {
            return new ArrayList<String>();
        }
        // noinspection CollectionDeclaredAsConcreteClass
        ArrayList<Object> list = new ArrayList<Object>(children.size());
        for (Property property : children) {
            list.add(property.getValue());
        }
        // TODO XXX FIXME for compatibility - this treats sclar lists as array
        // see NXP-1653. remove this when will be fixed
        // see also isContainer(), setValue() and accept()
        // if (getType().isScalarList()) {
        // if (list.isEmpty()) return null;
        // Object o = list.get(0);
        // Class<?> type = o.getClass();
        // if (o == null) {
        // // don't know the class of the element
        // // try to use schema information
        // type = JavaTypes.getPrimitiveClass(getType().getFieldType());
        // if (type == null) { // this should be a bug
        // throw new IllegalStateException("Scalar list type is not known - this
        // should be a bug");
        // }
        // } else {
        // type = o.getClass();
        // }
        // return list.toArray((Object[])Array.newInstance(type, list.size()));
        // }
        // end of compatibility code <--------
        return list;
    }

    @Override
    public Serializable getValueForWrite() throws PropertyException {
        if (isPhantom() || isRemoved()) {
            return getDefaultValue();
        }
        if (children.isEmpty()) {
            return new ArrayList<String>();
        }
        // noinspection CollectionDeclaredAsConcreteClass
        ArrayList<Object> list = new ArrayList<Object>(children.size());
        for (Property property : children) {
            list.add(property.getValueForWrite());
        }
        return list;
    }

    @Override
    @SuppressWarnings("unchecked")
    public void init(Serializable value) throws PropertyException {
        if (value == null) { // IGNORE null values - properties will be
                             // considered PHANTOMS
            return;
        }
        List<Serializable> list;
        if (value.getClass().isArray()) { // accept also arrays
            list = (List<Serializable>) PrimitiveArrays.toList(value);
        } else {
            list = (List<Serializable>) value;
        }
        children.clear(); // do not use clear() method since it is marking the
                          // list as dirty
        Field lfield = getType().getField();
        for (Serializable obj : list) {
            Property property = getRoot().createProperty(this, lfield, 0);
            property.init(obj);
            children.add(property);
        }
        removePhantomFlag();
    }

    @Override
    public void setValue(Object value) throws PropertyException {
        if (isReadOnly()) {
            throw new ReadOnlyPropertyException(getPath());
        }
        if (value == null) {
            List<Property> temp = new ArrayList<Property>(children);
            for (Property p : temp) { // remove all children
                p.remove();
            }
            return;
        }
        Collection<?> col;
        Class<?> klass = value.getClass();
        if (klass == ListDiff.class) { // listdiff support for compatibility
            applyListDiff((ListDiff) value);
            return;
        } else if (klass.isArray()) { // array support
            col = arrayToList(value);
        } else if (value instanceof Collection) { // collection support
            col = (Collection<?>) value;
        } else {
            throw new InvalidPropertyValueException(getPath());
        }
        clear();
        Field lfield = getType().getField();
        for (Object obj : col) {
            Property property = getRoot().createProperty(this, lfield, IS_NEW);
            property.setValue(obj);
            children.add(property);
        }
    }

    @Override
    public void clear() {
        children.clear();
        setIsModified();
    }

    @Override
    public Field getField() {
        return field;
    }

    public boolean remove(Property property) {
        if (!children.remove(property)) { // physically remove the property
            return false; // no such item
        }
        setIsModified();
        return true;
    }

    @Override
    public Property remove(int index) {
        Property property = children.remove(index);
        setIsModified();
        return property;
    }

    @Override
    public Object clone() throws CloneNotSupportedException {
        ListProperty clone = (ListProperty) super.clone();
        return clone;
    }

    @Override
    public void accept(PropertyVisitor visitor, Object arg) throws PropertyException {
        arg = visitor.visit(this, arg);
        if (arg != null && isContainer()) {
            for (Property property : children) {
                property.accept(visitor, arg);
            }
        }
    }

    /* ---------------------------- type conversion ------------------------ */

    @Override
    public boolean isNormalized(Object value) {
        return value == null || (value instanceof Collection && value instanceof Serializable);
    }

    @Override
    public Serializable normalize(Object value) throws PropertyConversionException {
        if (isNormalized(value)) {
            return (Serializable) value;
        }
        if (value.getClass().isArray()) {
            return arrayToList(value);
        }
        throw new PropertyConversionException(value.getClass(), List.class);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T convertTo(Serializable value, Class<T> toType) throws PropertyConversionException {
        if (value == null) {
            return null;
        } else if (toType.isAssignableFrom(value.getClass())) {
            return toType.cast(value);
        }
        if (toType.isArray()) {
            return (T) ((Collection<?>) value).toArray();
        } else if (toType == List.class || toType == Collection.class) {
            // TODO we need this for compatibility with scalar lists
            if (value.getClass().isArray()) {
                if (value.getClass().isPrimitive()) {
                    return (T) PrimitiveArrays.toList(value);
                } else {
                    return (T) Arrays.asList((Object[]) value);
                }
            }
        }
        return super.convertTo(value, toType);
    }

    // Must return ArrayList
    public static ArrayList<?> arrayToList(Object obj) {
        Object[] ar = PrimitiveArrays.toObjectArray(obj);
        ArrayList<Object> list = new ArrayList<Object>(ar.length);
        list.addAll(Arrays.asList(ar));
        return list;
    }

    /**
     * Supports ListDiff for compatibility.
     *
     * @param ld
     */
    public void applyListDiff(ListDiff ld) throws PropertyException {
        for (ListDiff.Entry entry : ld.diff()) {
            switch (entry.type) {
            case ListDiff.ADD:
                addValue(entry.value);
                break;
            case ListDiff.INSERT:
                addValue(entry.index, entry.value);
                break;
            case ListDiff.REMOVE:
                remove(entry.index);
                break;
            case ListDiff.CLEAR:
                clear();
                break;
            case ListDiff.MODIFY:
                get(entry.index).setValue(entry.value);
                break;
            case ListDiff.MOVE:
                int toIndex = (Integer) entry.value;
                int fromIndex = entry.index;
                Property src = children.get(fromIndex);
                src.moveTo(toIndex);
                break;
            }
        }
    }

    @Override
    public boolean isSameAs(Property property) throws PropertyException {
        if (!(property instanceof ListProperty)) {
            return false;
        }
        ListProperty lp = (ListProperty) property;
        List<Property> c1 = children;
        List<Property> c2 = lp.children;
        if (c1.size() != c2.size()) {
            return false;
        }
        for (int i = 0, size = c1.size(); i < size; i++) {
            Property p1 = c1.get(i);
            Property p2 = c2.get(i);
            if (!p1.isSameAs(p2)) {
                return false;
            }
        }
        return true;
    }

    @Override
    public Iterator<Property> getDirtyChildren() {
        if (!isContainer()) {
            throw new UnsupportedOperationException("Cannot iterate over children of scalar properties");
        }
        return new DirtyPropertyIterator(children.iterator());
    }

    public int indexOf(Property property) {
        for (int i = 0, size = children.size(); i < size; i++) {
            Property p = children.get(i);
            if (p == property) {
                return i;
            }
        }
        return -1;
    }

    boolean moveTo(Property property, int index) {
        if (index < 0 || index > children.size()) {
            throw new IndexOutOfBoundsException("Index out of bounds: " + index + ". Bounds are: 0 - "
                    + children.size());
        }
        int i = indexOf(property);
        if (i == -1) {
            throw new UnsupportedOperationException("You are trying to move a property that is not part of a list");
        }
        if (i == index) {
            return false;
        }
        if (i < index) {
            children.add(index + 1, property);
            children.remove(i);
        } else {
            children.add(index, property);
            children.remove(i + 1);
        }
        // new property must be dirty
        for (int j = Math.min(index, i); j < children.size(); j++) {
            ((AbstractProperty) children.get(j)).setIsModified();
        }
        return true;
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public void add(int index, Property element) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean add(Property o) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean addAll(Collection<? extends Property> c) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean addAll(int index, Collection<? extends Property> c) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean contains(Object o) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean containsAll(Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public int indexOf(Object o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isEmpty() {
        return children.isEmpty();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public int lastIndexOf(Object o) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public ListIterator<Property> listIterator() {
        return children.listIterator();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public ListIterator<Property> listIterator(int index) {
        return children.listIterator(index);
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean remove(Object o) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean removeAll(Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public boolean retainAll(Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public Property set(int index, Property element) {
        throw new UnsupportedOperationException();
    }

    /**
     * Throws UnsupportedOperationException, added to implement List<Property> interface
     */
    @Override
    public List<Property> subList(int fromIndex, int toIndex) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Object[] toArray() {
        return children.toArray();
    }

    @Override
    public <T> T[] toArray(T[] a) {
        return children.toArray(a);
    }

    @Override
    public void clearDirtyFlags() {
        // even makes child properties not dirty
        super.clearDirtyFlags();
        for (Property child : children) {
            child.clearDirtyFlags();
        }
    }

}