/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.metadata;

import com.google.common.base.Objects;
import io.crate.analyze.symbol.Symbol;
import io.crate.analyze.symbol.SymbolType;
import io.crate.analyze.symbol.Symbols;
import io.crate.metadata.table.ColumnPolicy;
import io.crate.types.DataType;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class GeneratedReference extends Reference {

    private final String formattedGeneratedExpression;

    private Symbol generatedExpression;
    private List<Reference> referencedReferences;

    public GeneratedReference(StreamInput in) throws IOException {
        super(in);
        formattedGeneratedExpression = in.readString();
        generatedExpression = Symbols.fromStream(in);
        int size = in.readVInt();
        referencedReferences = new ArrayList<>(size);
        for (int i = 0; i < size; i++) {
            referencedReferences.add(Reference.fromStream(in));
        }
    }

    public GeneratedReference(ReferenceIdent ident,
                              RowGranularity granularity,
                              DataType type,
                              ColumnPolicy columnPolicy,
                              IndexType indexType,
                              String formattedGeneratedExpression,
                              boolean nullable) {
        super(ident, granularity, type, columnPolicy, indexType, nullable);
        this.formattedGeneratedExpression = formattedGeneratedExpression;
    }

    public GeneratedReference(ReferenceIdent ident,
                              RowGranularity granularity,
                              DataType type,
                              String formattedGeneratedExpression) {
        super(ident, granularity, type);
        this.formattedGeneratedExpression = formattedGeneratedExpression;
    }

    public String formattedGeneratedExpression() {
        return formattedGeneratedExpression;
    }

    public void generatedExpression(Symbol generatedExpression) {
        this.generatedExpression = generatedExpression;
    }

    public Symbol generatedExpression() {
        assert generatedExpression != null : "Generated expression symbol must not be NULL, initialize first";
        return generatedExpression;
    }

    public void referencedReferences(List<Reference> references) {
        this.referencedReferences = references;
    }

    public List<Reference> referencedReferences() {
        return referencedReferences;
    }

    @Override
    public SymbolType symbolType() {
        return SymbolType.GENERATED_REFERENCE;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        if (!super.equals(o)) return false;
        GeneratedReference that = (GeneratedReference) o;
        return Objects.equal(formattedGeneratedExpression, that.formattedGeneratedExpression) &&
               Objects.equal(generatedExpression, that.generatedExpression) &&
               Objects.equal(referencedReferences, that.referencedReferences);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(super.hashCode(), formattedGeneratedExpression,
            generatedExpression, referencedReferences);
    }

    @Override
    public String toString() {
        return "GeneratedReference{" +
               "formattedGeneratedExpression='" + formattedGeneratedExpression + '\'' +
               ", generatedExpression=" + generatedExpression +
               ", referencedReferences=" + referencedReferences +
               '}';
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeString(formattedGeneratedExpression);
        Symbols.toStream(generatedExpression, out);
        out.writeVInt(referencedReferences.size());
        for (Reference reference : referencedReferences) {
            Reference.toStream(reference, out);
        }
    }
}