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/*
 * Copyright 2017-2019 original authors
 *
 * 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
 *
 * https://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.micronaut.data.runtime.intercept;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.convert.ConversionService;
import io.micronaut.core.type.Argument;
import io.micronaut.data.annotation.Query;
import io.micronaut.data.intercept.DeleteAllInterceptor;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.model.runtime.BatchOperation;
import io.micronaut.data.operations.RepositoryOperations;

import edu.umd.cs.findbugs.annotations.NonNull;
import io.micronaut.data.model.runtime.PreparedQuery;

/**
 * Default implementation of {@link DeleteAllInterceptor}.
 * @param  The declaring type
 * @author graemerocher
 * @since 1.0.0
 */
public class DefaultDeleteAllInterceptor extends AbstractQueryInterceptor implements DeleteAllInterceptor {

    /**
     * Default constructor.
     * @param datastore The operations
     */
    protected DefaultDeleteAllInterceptor(@NonNull RepositoryOperations datastore) {
        super(datastore);
    }

    @Override
    public Number intercept(RepositoryMethodKey methodKey, MethodInvocationContext context) {
        Argument resultType = context.getReturnType().asArgument();
        if (context.hasAnnotation(Query.class)) {
            PreparedQuery preparedQuery = (PreparedQuery) prepareQuery(methodKey, context);
            Number result = operations.executeUpdate(preparedQuery).orElse(0);
            return convertIfNecessary(resultType, result);
        } else {
            Object[] parameterValues = context.getParameterValues();
            Class rootEntity = getRequiredRootEntity(context);
            if (parameterValues.length == 1 && parameterValues[0] instanceof Iterable) {
                Iterable iterable = (Iterable) parameterValues[0];
                BatchOperation batchOperation = getBatchOperation(context, rootEntity, iterable);
                Number deleted = operations.deleteAll(batchOperation).orElse(0);
                return convertIfNecessary(resultType, deleted);
            } else if (parameterValues.length == 0) {
                BatchOperation batchOperation = getBatchOperation(context, rootEntity);
                Number result = operations.deleteAll(batchOperation).orElse(0);
                return convertIfNecessary(resultType, result);
            } else {
                throw new IllegalArgumentException("Unexpected argument types received to deleteAll method");
            }
        }
    }

    private Number convertIfNecessary(Argument resultType, Number result) {
        if (!resultType.getType().isInstance(result)) {
            return ConversionService.SHARED.convert(result, resultType).orElse(0);
        } else {
            return result;
        }
    }
}