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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
 */

package org.dinky.shaded.paimon.casting;

import org.dinky.shaded.paimon.types.DataType;
import org.dinky.shaded.paimon.types.DataTypeFamily;
import org.dinky.shaded.paimon.types.DataTypeRoot;

import javax.annotation.Nullable;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Stream;

/** Cast executors for input type and output type. */
public class CastExecutors {

    /* ------- Singleton declaration ------- */

    private static final CastExecutors INSTANCE = new CastExecutors();

    static {
        INSTANCE
                // Numeric rules
                .addRule(DecimalToDecimalCastRule.INSTANCE)
                .addRule(NumericPrimitiveToDecimalCastRule.INSTANCE)
                .addRule(DecimalToNumericPrimitiveCastRule.INSTANCE)
                .addRule(NumericPrimitiveCastRule.INSTANCE)
                // Boolean <-> numeric rules
                .addRule(BooleanToNumericCastRule.INSTANCE)
                .addRule(NumericToBooleanCastRule.INSTANCE)
                // To string rules
                .addRule(NumericToStringCastRule.INSTANCE)
                .addRule(BooleanToStringCastRule.INSTANCE)
                .addRule(TimestampToStringCastRule.INSTANCE)
                .addRule(TimeToStringCastRule.INSTANCE)
                .addRule(DateToStringCastRule.INSTANCE)
                .addRule(StringToStringCastRule.INSTANCE)
                // From string rules
                .addRule(StringToBooleanCastRule.INSTANCE)
                .addRule(StringToDecimalCastRule.INSTANCE)
                .addRule(StringToNumericPrimitiveCastRule.INSTANCE)
                .addRule(StringToDateCastRule.INSTANCE)
                .addRule(StringToTimeCastRule.INSTANCE)
                .addRule(StringToTimestampCastRule.INSTANCE)
                .addRule(StringToBinaryCastRule.INSTANCE)
                // Date/Time/Timestamp rules
                .addRule(TimestampToTimestampCastRule.INSTANCE)
                .addRule(TimestampToDateCastRule.INSTANCE)
                .addRule(TimestampToTimeCastRule.INSTANCE)
                .addRule(DateToTimestampCastRule.INSTANCE)
                .addRule(TimeToTimestampCastRule.INSTANCE)
                // To binary rules
                .addRule(BinaryToBinaryCastRule.INSTANCE);
    }

    /* ------- Entrypoint ------- */

    private static final CastExecutor IDENTITY_CAST_EXECUTOR = value -> value;

    /**
     * Resolve a {@link CastExecutor} for the provided input type and target type. Returns null if
     * no rule can be resolved.
     *
     * @param inputType the input value type.
     * @param outputType the output value type.
     * @return the {@link CastExecutor} instance.
     */
    public static @Nullable CastExecutor resolve(DataType inputType, DataType outputType) {
        CastRule rule = INSTANCE.internalResolve(inputType, outputType);
        if (rule == null) {
            return null;
        }
        return rule.create(inputType, outputType);
    }

    public static CastExecutor identityCastExecutor() {
        return IDENTITY_CAST_EXECUTOR;
    }

    // Map>
    private final Map>> rules = new HashMap<>();

    private CastExecutors addRule(CastRule rule) {
        CastRulePredicate predicate = rule.getPredicateDefinition();

        for (DataType targetType : predicate.getTargetTypes()) {
            final Map> map =
                    rules.computeIfAbsent(targetType, k -> new HashMap<>());
            for (DataTypeRoot inputTypeRoot : predicate.getInputTypeRoots()) {
                map.put(inputTypeRoot, rule);
            }
            for (DataTypeFamily inputTypeFamily : predicate.getInputTypeFamilies()) {
                map.put(inputTypeFamily, rule);
            }
        }
        for (DataTypeRoot targetTypeRoot : predicate.getTargetTypeRoots()) {
            final Map> map =
                    rules.computeIfAbsent(targetTypeRoot, k -> new HashMap<>());
            for (DataTypeRoot inputTypeRoot : predicate.getInputTypeRoots()) {
                map.put(inputTypeRoot, rule);
            }
            for (DataTypeFamily inputTypeFamily : predicate.getInputTypeFamilies()) {
                map.put(inputTypeFamily, rule);
            }
        }
        for (DataTypeFamily targetTypeFamily : predicate.getTargetTypeFamilies()) {
            final Map> map =
                    rules.computeIfAbsent(targetTypeFamily, k -> new HashMap<>());
            for (DataTypeRoot inputTypeRoot : predicate.getInputTypeRoots()) {
                map.put(inputTypeRoot, rule);
            }
            for (DataTypeFamily inputTypeFamily : predicate.getInputTypeFamilies()) {
                map.put(inputTypeFamily, rule);
            }
        }

        return this;
    }

    private CastRule internalResolve(DataType inputType, DataType targetType) {

        final Iterator