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/*
 * Licensed 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.
 */
package io.prestosql.sql.planner;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import io.prestosql.Session;
import io.prestosql.execution.warnings.WarningCollector;
import io.prestosql.metadata.Metadata;
import io.prestosql.security.AllowAllAccessControl;
import io.prestosql.spi.type.Type;
import io.prestosql.sql.parser.SqlParser;
import io.prestosql.sql.tree.Expression;
import io.prestosql.sql.tree.NodeRef;

import javax.inject.Inject;

import java.util.Map;

import static io.prestosql.sql.analyzer.ExpressionAnalyzer.analyzeExpressions;

/**
 * This class is to facilitate obtaining the type of an expression and its subexpressions
 * during planning (i.e., when interacting with IR expression). It will eventually get
 * removed when we split the AST from the IR and we encode the type directly into IR expressions.
 */
public class TypeAnalyzer
{
    private final SqlParser parser;
    private final Metadata metadata;

    @Inject
    public TypeAnalyzer(SqlParser parser, Metadata metadata)
    {
        this.parser = parser;
        this.metadata = metadata;
    }

    public Map, Type> getTypes(Session session, TypeProvider inputTypes, Iterable expressions)
    {
        return analyzeExpressions(session, metadata, new AllowAllAccessControl(), parser, inputTypes, expressions, ImmutableMap.of(), WarningCollector.NOOP, false).getExpressionTypes();
    }

    public Map, Type> getTypes(Session session, TypeProvider inputTypes, Expression expression)
    {
        return getTypes(session, inputTypes, ImmutableList.of(expression));
    }

    public Type getType(Session session, TypeProvider inputTypes, Expression expression)
    {
        return getTypes(session, inputTypes, expression).get(NodeRef.of(expression));
    }
}