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package org.javimmutable.collections.common;

import org.javimmutable.collections.IterableStreamable;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.MapEntry;
import org.javimmutable.collections.iterators.TransformStreamable;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import java.util.Map;
import java.util.function.BiPredicate;

@Immutable
public abstract class AbstractJImmutableMap
    implements JImmutableMap
{
    @Nullable
    @Override
    public V get(K key)
    {
        return getValueOr(key, null);
    }

    /**
     * Adds the key/value pair to this map.  Any value already existing for the specified key
     * is replaced with the new value.
     */
    @Override
    @Nonnull
    public JImmutableMap insert(@Nonnull Entry e)
    {
        return assign(e.getKey(), e.getValue());
    }

    @Nonnull
    @Override
    public JImmutableMap getInsertableSelf()
    {
        return this;
    }

    @Nonnull
    @Override
    public JImmutableMap assignAll(@Nonnull JImmutableMap map)
    {
        return map.reduce((JImmutableMap)this, (m, k, v) -> m = m.assign(k, v));
    }

    @Nonnull
    @Override
    public JImmutableMap assignAll(@Nonnull Map map)
    {
        JImmutableMap answer = this;
        for (Map.Entry e : map.entrySet()) {
            answer = answer.assign(e.getKey(), e.getValue());
        }
        return answer;
    }

    @Override
    public boolean isEmpty()
    {
        return size() == 0;
    }

    @Override
    public boolean isNonEmpty()
    {
        return size() != 0;
    }

    @Nonnull
    @Override
    public Map getMap()
    {
        return MapAdaptor.of(this);
    }

    @Nonnull
    @Override
    public IterableStreamable keys()
    {
        return TransformStreamable.ofKeys(this);
    }

    @Nonnull
    @Override
    public IterableStreamable values()
    {
        return TransformStreamable.ofValues(this);
    }

    @Override
    public int hashCode()
    {
        return getMap().hashCode();
    }

    @Override
    public boolean equals(Object o)
    {
        if (o == this) {
            return true;
        } else if (o instanceof JImmutableMap) {
            return getMap().equals(((JImmutableMap)o).getMap());
        } else {
            return (o instanceof Map) && getMap().equals(o);
        }
    }

    @Override
    public String toString()
    {
        final StringBuilder sb = new StringBuilder();
        sb.append("{");
        forEach((k, v) -> {
            if (sb.length() > 1) {
                sb.append(", ");
            }
            MapEntry.addToString(sb, k, v);
        });
        sb.append("}");
        return sb.toString();
    }

    public int getSpliteratorCharacteristics()
    {
        return StreamConstants.SPLITERATOR_UNORDERED;
    }

    @Nonnull
    @Override
    public JImmutableMap select(@Nonnull BiPredicate predicate)
    {
        return reduce(deleteAll().mapBuilder(), (b, k, v) -> predicate.test(k, v) ? b.add(k, v) : b).build();
    }

    @Nonnull
    @Override
    public JImmutableMap reject(@Nonnull BiPredicate predicate)
    {
        return reduce((JImmutableMap)this, (m, k, v) -> predicate.test(k, v) ? m.delete(k) : m);
    }
}