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package org.babyfish.jimmer.spring.cfg;

import graphql.GraphQL;
import graphql.language.*;
import graphql.schema.DataFetcher;
import graphql.schema.DataFetchingEnvironment;
import graphql.schema.idl.RuntimeWiring;
import graphql.schema.idl.TypeRuntimeWiring;
import org.babyfish.jimmer.meta.ImmutableProp;
import org.babyfish.jimmer.meta.ImmutableType;
import org.babyfish.jimmer.meta.PropId;
import org.babyfish.jimmer.meta.TargetLevel;
import org.babyfish.jimmer.meta.impl.TypedPropImpl;
import org.babyfish.jimmer.runtime.ImmutableSpi;
import org.babyfish.jimmer.sql.JSqlClient;
import org.babyfish.jimmer.sql.kt.KSqlClient;
import org.babyfish.jimmer.sql.runtime.JSqlClientImplementor;
import org.dataloader.DataLoader;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;
import org.springframework.graphql.execution.BatchLoaderRegistry;
import org.springframework.graphql.execution.GraphQlSource;
import org.springframework.graphql.execution.RuntimeWiringConfigurer;
import reactor.core.publisher.Mono;

import java.util.List;
import java.util.Map;

@ConditionalOnClass({GraphQL.class, GraphQlSource.class})
public class JimmerSpringGraphQLAutoConfiguration {

    @SuppressWarnings("unchecked")
    public JimmerSpringGraphQLAutoConfiguration(
            BatchLoaderRegistry registry,
            @Autowired(required = false) JSqlClient jSqlClient,
            @Autowired(required = false) KSqlClient kSqlClient
    ) {
        JSqlClientImplementor sqlClient = sqlClient(jSqlClient, kSqlClient);
        for (ImmutableType type : sqlClient.getEntityManager().getAllTypes(sqlClient.getMicroServiceName())) {
            if (type.isEntity()) {
                for (ImmutableProp prop : type.getProps().values()) {
                    if (prop.isReference(TargetLevel.ENTITY)) {
                        registry.forName(prop.toString()).registerMappedBatchLoader((sources, env) -> {
                            return Mono.just(
                                    sqlClient
                                            .getLoaders()
                                            .reference(
                                                    new TypedPropImpl.Reference<>(prop)
                                            )
                                            .batchLoad(sources)
                            );
                        });
                    } else if (prop.isReferenceList(TargetLevel.ENTITY)) {
                        registry.forName(prop.toString()).registerMappedBatchLoader((sources, env) -> {
                            return Mono.just(
                                    (Map) (Map)sqlClient
                                            .getLoaders()
                                            .list(
                                                    new TypedPropImpl.ReferenceList<>(prop)
                                            )
                                            .batchLoad(sources)
                            );
                        });
                    } else if (prop.hasTransientResolver()) {
                        registry.forName(prop.toString()).registerMappedBatchLoader((sources, env) -> {
                            return Mono.just(
                                    sqlClient
                                            .getLoaders()
                                            .value(
                                                    // Temporary solution, jimmer change graphql solution in next version
                                                    new TypedPropImpl.Scalar<>(prop)
                                            )
                                            .batchLoad(sources)
                            );
                        });
                    }
                }
            }
        }
    }

    @Bean
    public RuntimeWiringConfigurer jimmerRuntimeWiringConfigurer(
            @Autowired(required = false) JSqlClient jSqlClient,
            @Autowired(required = false) KSqlClient kSqlClient
    ) {
        JSqlClientImplementor sqlClient = sqlClient(jSqlClient, kSqlClient);
        return wiringBuilder -> {
            registerJimmerDataFetchers(wiringBuilder, sqlClient);
        };
    }

    private static void registerJimmerDataFetchers(
            RuntimeWiring.Builder wiringBuilder,
            JSqlClientImplementor sqlClient
    ) {
        for (ImmutableType type : sqlClient.getEntityManager().getAllTypes(sqlClient.getMicroServiceName())) {
            if (type.isEntity()) {
                TypeRuntimeWiring.Builder typeBuilder = TypeRuntimeWiring
                        .newTypeWiring(type.getJavaClass().getSimpleName());
                for (ImmutableProp prop : type.getProps().values()) {
                    if (prop.isAssociation(TargetLevel.ENTITY) || prop.hasTransientResolver()) {
                        typeBuilder.dataFetcher(prop.getName(), new JimmerComplexFetcher(prop));
                    } else {
                        typeBuilder.dataFetcher(prop.getName(), new JimmerSimpleFetcher(prop.getId()));
                    }
                }
                wiringBuilder.type(typeBuilder);
            }
        }
    }

    private static JSqlClientImplementor sqlClient(
            JSqlClient jSqlClient,
            KSqlClient kSqlClient
    ) {
        return (JSqlClientImplementor) (
                jSqlClient != null ?
                        jSqlClient :
                        kSqlClient.getJavaClient()
        );
    }

    private static class JimmerSimpleFetcher implements DataFetcher