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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.trino.sql.analyzer;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.ImmutableList;
import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
import io.trino.Session;
import io.trino.cache.CacheUtils;
import io.trino.metadata.ResolvedFunction;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.type.Decimals;
import io.trino.spi.type.TimeType;
import io.trino.spi.type.TimeWithTimeZoneType;
import io.trino.spi.type.TimestampType;
import io.trino.spi.type.TimestampWithTimeZoneType;
import io.trino.spi.type.Type;
import io.trino.sql.InterpretedFunctionInvoker;
import io.trino.sql.PlannerContext;
import io.trino.sql.tree.AstVisitor;
import io.trino.sql.tree.BinaryLiteral;
import io.trino.sql.tree.BooleanLiteral;
import io.trino.sql.tree.DecimalLiteral;
import io.trino.sql.tree.DoubleLiteral;
import io.trino.sql.tree.Expression;
import io.trino.sql.tree.GenericLiteral;
import io.trino.sql.tree.IntervalLiteral;
import io.trino.sql.tree.Literal;
import io.trino.sql.tree.LongLiteral;
import io.trino.sql.tree.NullLiteral;
import io.trino.sql.tree.StringLiteral;

import java.util.function.Function;

import static io.airlift.slice.Slices.utf8Slice;
import static io.trino.cache.SafeCaches.buildNonEvictableCache;
import static io.trino.spi.type.VarcharType.VARCHAR;
import static io.trino.sql.analyzer.TypeSignatureProvider.fromTypes;
import static io.trino.type.DateTimes.parseTime;
import static io.trino.type.DateTimes.parseTimeWithTimeZone;
import static io.trino.type.DateTimes.parseTimestamp;
import static io.trino.type.DateTimes.parseTimestampWithTimeZone;
import static io.trino.type.JsonType.JSON;
import static io.trino.util.DateTimeUtils.parseDayTimeInterval;
import static io.trino.util.DateTimeUtils.parseYearMonthInterval;
import static java.util.Objects.requireNonNull;

public final class LiteralInterpreter
{
    private final PlannerContext plannerContext;
    private final ConnectorSession connectorSession;
    private final InterpretedFunctionInvoker functionInvoker;

    private final Cache> genericLiteralEvaluatorCache = buildNonEvictableCache(CacheBuilder.newBuilder().maximumSize(1000));

    public LiteralInterpreter(PlannerContext plannerContext, Session session)
    {
        this.plannerContext = requireNonNull(plannerContext, "plannerContext is null");
        this.connectorSession = session.toConnectorSession();
        this.functionInvoker = new InterpretedFunctionInvoker(plannerContext.getFunctionManager());
    }

    public Object evaluate(Expression node, Type type)
    {
        if (!(node instanceof Literal)) {
            throw new IllegalArgumentException("node must be a Literal");
        }
        return new LiteralVisitor(type).process(node, null);
    }

    private class LiteralVisitor
            extends AstVisitor
    {
        private final Type type;

        private LiteralVisitor(Type type)
        {
            this.type = requireNonNull(type, "type is null");
        }

        @Override
        protected Object visitLiteral(Literal node, Void context)
        {
            throw new UnsupportedOperationException("Unhandled literal type: " + node);
        }

        @Override
        protected Object visitBooleanLiteral(BooleanLiteral node, Void context)
        {
            return node.getValue();
        }

        @Override
        protected Long visitLongLiteral(LongLiteral node, Void context)
        {
            return node.getParsedValue();
        }

        @Override
        protected Double visitDoubleLiteral(DoubleLiteral node, Void context)
        {
            return node.getValue();
        }

        @Override
        protected Object visitDecimalLiteral(DecimalLiteral node, Void context)
        {
            return Decimals.parse(node.getValue()).getObject();
        }

        @Override
        protected Slice visitStringLiteral(StringLiteral node, Void context)
        {
            return utf8Slice(node.getValue());
        }

        @Override
        protected Slice visitBinaryLiteral(BinaryLiteral node, Void context)
        {
            return Slices.wrappedBuffer(node.getValue());
        }

        @Override
        protected Object visitGenericLiteral(GenericLiteral node, Void context)
        {
            return switch (type) {
                case TimeType unused -> parseTime(node.getValue());
                case TimeWithTimeZoneType value -> parseTimeWithTimeZone(value.getPrecision(), node.getValue());
                case TimestampType value -> parseTimestamp(value.getPrecision(), node.getValue());
                case TimestampWithTimeZoneType value -> parseTimestampWithTimeZone(value.getPrecision(), node.getValue());
                default -> {
                    Function evaluator = CacheUtils.uncheckedCacheGet(genericLiteralEvaluatorCache, type, () -> {
                        boolean isJson = JSON.equals(type);
                        ResolvedFunction resolvedFunction;
                        if (isJson) {
                            resolvedFunction = plannerContext.getMetadata().resolveBuiltinFunction("json_parse", fromTypes(VARCHAR));
                        }
                        else {
                            resolvedFunction = plannerContext.getMetadata().getCoercion(VARCHAR, type);
                        }
                        return evaluatedNode -> functionInvoker.invoke(resolvedFunction, connectorSession, ImmutableList.of(utf8Slice(evaluatedNode.getValue())));
                    });
                    yield evaluator.apply(node);
                }
            };
        }

        @Override
        protected Long visitIntervalLiteral(IntervalLiteral node, Void context)
        {
            if (node.isYearToMonth()) {
                return node.getSign().multiplier() * parseYearMonthInterval(node.getValue(), node.getStartField(), node.getEndField());
            }
            return node.getSign().multiplier() * parseDayTimeInterval(node.getValue(), node.getStartField(), node.getEndField());
        }

        @Override
        protected Object visitNullLiteral(NullLiteral node, Void context)
        {
            return null;
        }
    }
}