/**
 * Copyright (c) 2014, University of Warsaw
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package pl.edu.mimuw.cloudatlas.model;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Set;

import pl.edu.mimuw.cloudatlas.model.TypeCollection;
import pl.edu.mimuw.cloudatlas.model.Value;
import pl.edu.mimuw.cloudatlas.model.ValueList;

/**
 * A value representing a list of values of the specified type. Implements <code>List</code> interface.
 * <p>
 * All constructors take a type of elements stored in this list. This type is checked when adding elements to the list
 * and an <code>IllegalArgumentException</code> is thrown in case of a mismatch.
 *
 * @see java.util.List
 */
public class ValueList extends ValueSimple<List<Value>> implements List<Value> {
    private TypeCollection type;

    /**
     * Creates a new <code>ValueList</code> containing all the elements in the specified list.
     *
     * @param value a list which content will be copied to this value
     * @param elementType type of elements stored in this list
     */
    public ValueList(List<Value> value, Type elementType) {
        this(elementType);
        if(value != null)
            setValue(value);
    }

    /**
     * Creates an empty list.
     *
     * @param elementType type of elements stored in this list
     */
    public ValueList(Type elementType) {
        super(new ArrayList<Value>());
        type = new TypeCollection(Type.PrimaryType.LIST, elementType);
    }

    @Override
    public Type getType() {
        return type;
    }

    @Override
    public Value getDefaultValue() {
        return new ValueList(((TypeCollection)this.getType()).getElementType());
    }

    /**
     * Gets a <code>List</code> containing all the objects stored in this value. Modifying the returned list will cause an
     * exception.
     */
    @Override
    public List<Value> getValue() {
        return getList() == null? null : Collections.unmodifiableList(getList());
    }

    @Override
    public ValueList addValue(Value value) {
        sameTypesOrThrow(value, Operation.ADD);
        if(isNull() || value.isNull())
            return new ValueList(null, ((TypeCollection)getType()).getElementType());
        List<Value> result = new ArrayList<Value>(getValue());
        result.addAll(((ValueList)value).getValue());
        return new ValueList(result, ((TypeCollection)getType()).getElementType());
    }

    @Override
    public Value convertTo(Type type) {
        switch(type.getPrimaryType()) {
            case LIST:
                if(getType().isCompatible(type))
                    return this;
                throw new UnsupportedConversionException(getType(), type);
            case SET:
                if(this.type.getElementType().isCompatible(((TypeCollection)type).getElementType())) {
                    if(this.isNull())
                        return new ValueSet(null, this.type.getElementType());
                    Set<Value> set = new HashSet<Value>();
                    set.addAll(this);
                    return new ValueSet(set, this.type.getElementType());
                }
                throw new UnsupportedConversionException(getType(), type);
            case STRING:
                return getValue() == null? ValueString.NULL_STRING : new ValueString(getValue().toString());
            default:
                throw new UnsupportedConversionException(getType(), type);
        }
    }

    @Override
    public ValueInt valueSize() {
        return new ValueInt((getList() == null? null : (long)getList().size()));
    }

    @Override
    public void setValue(List<Value> list) {
        if(list == null)
            super.setValue(null);
        else {
            super.setValue(new ArrayList<Value>());
            for(Value e : list)
                add(e);
        }
    }

    private List<Value> getList() {
        return super.getValue();
    }

    private void checkElement(Value element) {
        if(element == null)
            throw new IllegalArgumentException("If you want to use null, create an object containing null instead.");
        if(!type.getElementType().isCompatible(element.getType()))
            throw new IllegalArgumentException("This list contains elements of type "
                    + type.getElementType().toString() + " only. Incompatible with elements of type: "
                    + element.getType().toString());
    }

    @Override
    public boolean add(Value e) {
        checkElement(e);
        return getList().add(e);
    }

    @Override
    public void add(int index, Value element) {
        checkElement(element);
        getList().add(index, element);
    }

    @Override
    public boolean addAll(Collection<? extends Value> c) {
        for(Value e : c)
            checkElement(e);
        return getList().addAll(c);
    }

    @Override
    public boolean addAll(int index, Collection<? extends Value> c) {
        for(Value e : c)
            checkElement(e);
        return getList().addAll(index, c);
    }

    @Override
    public void clear() {
        getList().clear();
    }

    @Override
    public boolean contains(Object o) {
        return getList().contains(o);
    }

    @Override
    public boolean containsAll(Collection<?> c) {
        return getList().containsAll(c);
    }

    @Override
    public Value get(int index) {
        return getList().get(index);
    }

    @Override
    public int indexOf(Object o) {
        return getList().indexOf(o);
    }

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

    @Override
    public Iterator<Value> iterator() {
        return getList().iterator();
    }

    @Override
    public int lastIndexOf(Object o) {
        return getList().lastIndexOf(o);
    }

    @Override
    public ListIterator<Value> listIterator() {
        return getList().listIterator();
    }

    @Override
    public ListIterator<Value> listIterator(int index) {
        return getList().listIterator(index);
    }

    @Override
    public boolean remove(Object o) {
        return getList().remove(o);
    }

    @Override
    public Value remove(int index) {
        return getList().remove(index);
    }

    @Override
    public boolean removeAll(Collection<?> c) {
        return getList().removeAll(c);
    }

    @Override
    public boolean retainAll(Collection<?> c) {
        return getList().retainAll(c);
    }

    @Override
    public Value set(int index, Value element) {
        checkElement(element);
        return getList().set(index, element);
    }

    @Override
    public int size() {
        return getList().size();
    }

    @Override
    public List<Value> subList(int fromIndex, int toIndex) {
        return new ValueList(getList().subList(fromIndex, toIndex), type.getElementType());
    }

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

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