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package io.sphere.sdk.search;

import io.sphere.sdk.models.Base;

import javax.annotation.Nullable;
import java.util.Optional;
import java.util.function.Function;

import static io.sphere.sdk.utils.IterableUtils.toStream;
import static java.util.stream.Collectors.joining;

abstract class SearchModelExpression extends Base {
    private final SearchModel searchModel;
    private final TypeSerializer typeSerializer;
    @Nullable
    protected final String alias;

    protected SearchModelExpression(final SearchModel searchModel, final TypeSerializer typeSerializer, @Nullable final String alias) {
        this.searchModel = searchModel;
        this.typeSerializer = typeSerializer;
        this.alias = alias;
    }

    public final String serializeValue(final V value) {
        return typeSerializer.getSerializer().apply(value);
    }

    public final V deserializeValue(final String valueAsString) {
        return typeSerializer.getDeserializer().apply(valueAsString);
    }

    public final String toSearchExpression() {
        return attributePath() + serializedValue() + serializedAlias();
    }

    public final String attributePath() {
        return toStream(searchModel.buildPath()).collect(joining("."));
    }

    public final String resultPath() {
        return Optional.ofNullable(alias).orElse(attributePath());
    }

    protected final String serializedAlias() {
        return Optional.ofNullable(alias).map(a -> " as " + a).orElse("");
    }

    protected abstract String serializedValue();

    protected Function serializer() {
        return typeSerializer.getSerializer();
    }

    @Override
    public String toString() {
        return toSearchExpression();
    }

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