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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.contentpacks.model.entities;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableSet;
import com.google.common.graph.Traverser;
import org.graylog.plugins.views.search.Filter;
import org.graylog.plugins.views.search.GlobalOverride;
import org.graylog.plugins.views.search.Query;
import org.graylog.plugins.views.search.engine.BackendQuery;
import org.graylog.plugins.views.search.filter.StreamFilter;
import org.graylog.plugins.views.search.searchfilters.model.UsedSearchFilter;
import org.graylog2.contentpacks.NativeEntityConverter;
import org.graylog2.contentpacks.exceptions.ContentPackException;
import org.graylog2.contentpacks.model.entities.references.ValueReference;
import org.graylog2.plugin.indexer.searches.timeranges.TimeRange;
import org.graylog2.plugin.streams.Stream;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

import static com.google.common.base.MoreObjects.firstNonNull;
import static com.google.common.collect.ImmutableSortedSet.of;
import static java.util.stream.Collectors.toSet;
import static org.graylog2.contentpacks.facades.StreamReferenceFacade.resolveStreamEntityObject;

@AutoValue
@JsonAutoDetect
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonDeserialize(builder = QueryEntity.Builder.class)
public abstract class QueryEntity implements NativeEntityConverter {

    @JsonProperty
    public abstract String id();

    @JsonProperty
    public abstract TimeRange timerange();

    @Nullable
    @JsonProperty
    public abstract Filter filter();

    @JsonProperty
    public abstract List filters();

    @Nonnull
    @JsonProperty
    public abstract BackendQuery query();

    @JsonIgnore
    public abstract Optional globalOverride();

    @Nonnull
    @JsonProperty("search_types")
    public abstract ImmutableSet searchTypes();

    public Set usedStreamIds() {
        return Optional.ofNullable(filter())
                .map(optFilter -> {
                    @SuppressWarnings("UnstableApiUsage") final Traverser filterTraverser = Traverser.forTree(filter -> firstNonNull(filter.filters(), Collections.emptySet()));
                    return StreamSupport.stream(filterTraverser.breadthFirst(optFilter).spliterator(), false)
                            .filter(filter -> filter instanceof StreamFilter)
                            .map(streamFilter -> ((StreamFilter) streamFilter).streamId())
                            .filter(Objects::nonNull)
                            .collect(toSet());
                })
                .orElse(Collections.emptySet());
    }

    public abstract Builder toBuilder();

    public static Builder builder() {
        return Builder.createWithDefaults();
    }

    @AutoValue.Builder
    @JsonPOJOBuilder(withPrefix = "")
    public abstract static class Builder {
        @JsonProperty
        public abstract Builder id(String id);

        @JsonProperty
        public abstract Builder timerange(TimeRange timerange);

        @JsonProperty
        public abstract Builder filter(Filter filter);

        @JsonProperty
        public abstract Builder filters(List filters);

        @JsonProperty
        public abstract Builder query(BackendQuery query);

        public abstract Builder globalOverride(@Nullable GlobalOverride globalOverride);

        @JsonProperty("search_types")
        public abstract Builder searchTypes(@Nullable Set searchTypes);

        abstract QueryEntity autoBuild();

        @JsonCreator
        static Builder createWithDefaults() {
            return new AutoValue_QueryEntity.Builder()
                    .filters(Collections.emptyList())
                    .searchTypes(of());
        }

        public QueryEntity build() {
            return autoBuild();
        }
    }

    // TODO: This code assumes that we only use shallow filters for streams.
    //       If this ever changes, we need to implement a mapper that can handle filter trees.
    private Filter shallowMappedFilter(Map nativeEntities) {
       return Optional.ofNullable(filter())
               .map(optFilter -> {
                  Set newFilters = optFilter.filters().stream()
                          .map(filter -> {
                              if (filter.type().matches(StreamFilter.NAME)) {
                                  final StreamFilter streamFilter = (StreamFilter) filter;
                                  final Stream stream = (Stream) resolveStreamEntityObject(streamFilter.streamId(), nativeEntities);
                                  if (Objects.isNull(stream)) {
                                      throw new ContentPackException("Could not find matching stream id: " +
                                              streamFilter.streamId());
                                  }
                                  return streamFilter.toBuilder().streamId(stream.getId()).build();
                              }
                              return filter;
                          }).collect(Collectors.toSet());
                  return optFilter.toGenericBuilder().filters(newFilters).build();
               })
               .orElse(null);
    }

    @Override
    public Query toNativeEntity(Map parameters, Map nativeEntities) {
        return Query.builder()
                .id(id())
                .searchTypes(searchTypes().stream().map(s -> s.toNativeEntity(parameters, nativeEntities))
                        .collect(Collectors.toSet()))
                .query(query())
                .filter(shallowMappedFilter(nativeEntities))
                .filters(convertSearchFilters(filters()))
                .timerange(timerange())
                .globalOverride(globalOverride().orElse(null))
                .build();
    }
}