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/**
 * Copyright 2016 Yurii Rashkovskii
 *
 * 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
 */
package graphql.annotations.processor.util;

import graphql.annotations.connection.ConnectionValidator;
import graphql.annotations.connection.FakeRelay;
import graphql.annotations.connection.GraphQLConnection;
import graphql.annotations.dataFetchers.connection.AsyncConnectionDataFetcher;
import graphql.annotations.dataFetchers.connection.ConnectionDataFetcher;
import graphql.annotations.processor.ProcessingElementsContainer;
import graphql.relay.Relay;
import graphql.schema.*;

import java.lang.reflect.AccessibleObject;
import java.util.Arrays;
import java.util.List;

import static graphql.annotations.processor.util.ReflectionKit.newInstance;

public class ConnectionUtil {
    private static final List TYPES_FOR_CONNECTION = Arrays.asList(GraphQLObjectType.class, GraphQLInterfaceType.class, GraphQLUnionType.class, GraphQLTypeReference.class);

    public static boolean isConnection(AccessibleObject obj, GraphQLType type) {
        if (!obj.isAnnotationPresent(GraphQLConnection.class)) {
          return false;
        }

        if (type instanceof graphql.schema.GraphQLNonNull) {
            type =  ((GraphQLNonNull) type).getWrappedType();
        }
        if (!(type instanceof GraphQLList)) {
          return false;
        }

        type = ((GraphQLList) type).getWrappedType();
        if (type instanceof graphql.schema.GraphQLNonNull) {
            type =  ((GraphQLNonNull) type).getWrappedType();
        }

        final GraphQLType elementType = type;
        boolean isValidGraphQLTypeForConnection = TYPES_FOR_CONNECTION.stream().anyMatch(aClass -> aClass.isInstance(elementType));

        if (isValidGraphQLTypeForConnection) {
            ConnectionValidator validator = newInstance(obj.getAnnotation(GraphQLConnection.class).validator());
            validator.validate(obj);
            return true;
        } else {
            return false;
        }
    }

    public static Relay getRelay(AccessibleObject obj, ProcessingElementsContainer container) {
        if (obj.isAnnotationPresent(GraphQLConnection.class)) {
            Class aClass = obj.getAnnotation(GraphQLConnection.class).connectionType();
            if (!FakeRelay.class.isAssignableFrom(aClass)) {
                return newInstance(aClass);
            }
        }
        return container.getRelay();
    }

    public static DataFetcher getConnectionDataFetcher(GraphQLConnection connectionAnnotation, DataFetcher actualDataFetcher) {
        actualDataFetcher = new ConnectionDataFetcher(connectionAnnotation.connectionFetcher(), actualDataFetcher);
        if (connectionAnnotation.async()) {
            actualDataFetcher = new AsyncConnectionDataFetcher((ConnectionDataFetcher) actualDataFetcher);
        }
        return actualDataFetcher;
    }

}