package bjc.utils.funcdata;

import bjc.utils.funcutils.ListUtils;

import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;

class ExtendedMap<KeyType, ValueType> implements IMap<KeyType, ValueType> {
	private IMap<KeyType, ValueType> delegate;

	private IMap<KeyType, ValueType> store;

	public ExtendedMap(IMap<KeyType, ValueType> delegate, IMap<KeyType, ValueType> store) {
		this.delegate = delegate;
		this.store = store;
	}

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

	@Override
	public boolean containsKey(KeyType key) {
		if (store.containsKey(key))
			return true;

		return delegate.containsKey(key);
	}

	@Override
	public IMap<KeyType, ValueType> extend() {
		return new ExtendedMap<>(this, new FunctionalMap<>());
	}

	@Override
	public void forEach(BiConsumer<KeyType, ValueType> action) {
		store.forEach(action);

		delegate.forEach(action);
	}

	@Override
	public void forEachKey(Consumer<KeyType> action) {
		store.forEachKey(action);

		delegate.forEachKey(action);
	}

	@Override
	public void forEachValue(Consumer<ValueType> action) {
		store.forEachValue(action);

		delegate.forEachValue(action);
	}

	@Override
	public ValueType get(KeyType key) {
		if (store.containsKey(key))
			return store.get(key);

		return delegate.get(key);
	}

	@Override
	public int size() {
		return store.size() + delegate.size();
	}

	@Override
	public IList<KeyType> keyList() {
		return ListUtils.mergeLists(store.keyList(), delegate.keyList());
	}

	@Override
	public <MappedValue> IMap<KeyType, MappedValue> transform(Function<ValueType, MappedValue> transformer) {
		return new TransformedValueMap<>(this, transformer);
	}

	@Override
	public ValueType put(KeyType key, ValueType val) {
		return store.put(key, val);
	}

	@Override
	public ValueType remove(KeyType key) {
		if (!store.containsKey(key))
			return delegate.remove(key);

		return store.remove(key);
	}

	@Override
	public IList<ValueType> valueList() {
		return ListUtils.mergeLists(store.valueList(), delegate.valueList());
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((delegate == null) ? 0 : delegate.hashCode());
		result = prime * result + ((store == null) ? 0 : store.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (!(obj instanceof ExtendedMap))
			return false;

		ExtendedMap<?, ?> other = (ExtendedMap<?, ?>) obj;

		if (delegate == null) {
			if (other.delegate != null)
				return false;
		} else if (!delegate.equals(other.delegate))
			return false;
		if (store == null) {
			if (other.store != null)
				return false;
		} else if (!store.equals(other.store))
			return false;

		return true;
	}

	@Override
	public String toString() {
		return String.format("ExtendedMap [delegate=%s, store=%s]", delegate, store);
	}
}