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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.index.mapper;

import org.elasticsearch.ElasticsearchParseException;
import org.elasticsearch.common.Explicit;
import org.elasticsearch.common.collect.CopyOnWriteHashMap;
import org.elasticsearch.common.logging.DeprecationCategory;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.support.XContentMapValues;
import org.elasticsearch.index.mapper.MapperService.MergeReason;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;

public class ObjectMapper extends Mapper implements Cloneable {
    private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(ObjectMapper.class);

    public static final String CONTENT_TYPE = "object";

    public static class Defaults {
        public static final boolean ENABLED = true;
    }

    public enum Dynamic {
        TRUE {
            @Override
            DynamicFieldsBuilder getDynamicFieldsBuilder() {
                return DynamicFieldsBuilder.DYNAMIC_TRUE;
            }
        },
        FALSE,
        STRICT,
        RUNTIME {
            @Override
            DynamicFieldsBuilder getDynamicFieldsBuilder() {
                return DynamicFieldsBuilder.DYNAMIC_RUNTIME;
            }
        };

        DynamicFieldsBuilder getDynamicFieldsBuilder() {
            throw new UnsupportedOperationException("Cannot create dynamic fields when dynamic is set to [" + this + "]");
        };
    }

    public static class Builder extends Mapper.Builder {

        protected Explicit enabled = new Explicit<>(true, false);

        protected Dynamic dynamic;

        protected final List mappersBuilders = new ArrayList<>();

        public Builder(String name) {
            super(name);
        }

        public Builder enabled(boolean enabled) {
            this.enabled = new Explicit<>(enabled, true);
            return this;
        }

        public Builder dynamic(Dynamic dynamic) {
            this.dynamic = dynamic;
            return this;
        }

        public Builder add(Mapper.Builder builder) {
            mappersBuilders.add(builder);
            return this;
        }

        protected final Map buildMappers(ContentPath contentPath) {
            contentPath.add(name);
            Map mappers = new HashMap<>();
            for (Mapper.Builder builder : mappersBuilders) {
                Mapper mapper = builder.build(contentPath);
                Mapper existing = mappers.get(mapper.simpleName());
                if (existing != null) {
                    mapper = existing.merge(mapper);
                }
                mappers.put(mapper.simpleName(), mapper);
            }
            contentPath.remove();
            return mappers;
        }

        @Override
        public ObjectMapper build(ContentPath contentPath) {
            return new ObjectMapper(name, contentPath.pathAsText(name), enabled, dynamic, buildMappers(contentPath));
        }
    }

    public static class TypeParser implements Mapper.TypeParser {
        @Override
        public Mapper.Builder parse(String name,
                                    Map node,
                                    MappingParserContext parserContext)
            throws MapperParsingException {
            ObjectMapper.Builder builder = new Builder(name);
            for (Iterator> iterator = node.entrySet().iterator(); iterator.hasNext();) {
                Map.Entry entry = iterator.next();
                String fieldName = entry.getKey();
                Object fieldNode = entry.getValue();
                if (parseObjectOrDocumentTypeProperties(fieldName, fieldNode, parserContext, builder)) {
                    iterator.remove();
                }
            }
            return builder;
        }

        @SuppressWarnings({"unchecked", "rawtypes"})
        protected static boolean parseObjectOrDocumentTypeProperties(String fieldName,
                                                                     Object fieldNode,
                                                                     MappingParserContext parserContext,
                                                                     ObjectMapper.Builder builder) {
            if (fieldName.equals("dynamic")) {
                String value = fieldNode.toString();
                if (value.equalsIgnoreCase("strict")) {
                    builder.dynamic(Dynamic.STRICT);
                }  else if (value.equalsIgnoreCase("runtime")) {
                    builder.dynamic(Dynamic.RUNTIME);
                } else {
                    boolean dynamic = XContentMapValues.nodeBooleanValue(fieldNode, fieldName + ".dynamic");
                    builder.dynamic(dynamic ? Dynamic.TRUE : Dynamic.FALSE);
                }
                return true;
            } else if (fieldName.equals("enabled")) {
                builder.enabled(XContentMapValues.nodeBooleanValue(fieldNode, fieldName + ".enabled"));
                return true;
            } else if (fieldName.equals("properties")) {
                if (fieldNode instanceof Collection && ((Collection) fieldNode).isEmpty()) {
                    // nothing to do here, empty (to support "properties: []" case)
                } else if ((fieldNode instanceof Map) == false) {
                    throw new ElasticsearchParseException("properties must be a map type");
                } else {
                    parseProperties(builder, (Map) fieldNode, parserContext);
                }
                return true;
            } else if (fieldName.equals("include_in_all")) {
                deprecationLogger.deprecate(DeprecationCategory.MAPPINGS, "include_in_all",
                    "[include_in_all] is deprecated, the _all field have been removed in this version");
                return true;
            }
            return false;
        }

        protected static void parseProperties(ObjectMapper.Builder objBuilder,
                                              Map propsNode,
                                              MappingParserContext parserContext) {
            Iterator> iterator = propsNode.entrySet().iterator();
            while (iterator.hasNext()) {
                Map.Entry entry = iterator.next();
                String fieldName = entry.getKey();
                // Should accept empty arrays, as a work around for when the
                // user can't provide an empty Map. (PHP for example)
                boolean isEmptyList = entry.getValue() instanceof List && ((List) entry.getValue()).isEmpty();

                if (entry.getValue() instanceof Map) {
                    @SuppressWarnings("unchecked")
                    Map propNode = (Map) entry.getValue();
                    String type;
                    Object typeNode = propNode.get("type");
                    if (typeNode != null) {
                        type = typeNode.toString();
                    } else {
                        // lets see if we can derive this...
                        if (propNode.get("properties") != null) {
                            type = ObjectMapper.CONTENT_TYPE;
                        } else if (propNode.size() == 1 && propNode.get("enabled") != null) {
                            // if there is a single property with the enabled
                            // flag on it, make it an object
                            // (usually, setting enabled to false to not index
                            // any type, including core values, which
                            type = ObjectMapper.CONTENT_TYPE;
                        } else {
                            throw new MapperParsingException("No type specified for field [" + fieldName + "]");
                        }
                    }

                    Mapper.TypeParser typeParser = parserContext.typeParser(type);
                    if (typeParser == null) {
                        throw new MapperParsingException("No handler for type [" + type + "] declared on field [" + fieldName + "]");
                    }
                    String[] fieldNameParts = fieldName.split("\\.");
                    String realFieldName = fieldNameParts[fieldNameParts.length - 1];
                    Mapper.Builder fieldBuilder = typeParser.parse(realFieldName, propNode, parserContext);
                    for (int i = fieldNameParts.length - 2; i >= 0; --i) {
                        ObjectMapper.Builder intermediate
                            = new ObjectMapper.Builder(fieldNameParts[i]);
                        intermediate.add(fieldBuilder);
                        fieldBuilder = intermediate;
                    }
                    objBuilder.add(fieldBuilder);
                    propNode.remove("type");
                    MappingParser.checkNoRemainingFields(fieldName, propNode);
                    iterator.remove();
                } else if (isEmptyList) {
                    iterator.remove();
                } else {
                    throw new MapperParsingException("Expected map for property [fields] on field [" + fieldName + "] but got a "
                            + fieldName.getClass());
                }
            }

            MappingParser.checkNoRemainingFields(propsNode, "DocType mapping definition has unsupported parameters: ");
        }
    }

    private final String fullPath;

    protected Explicit enabled;

    protected volatile Dynamic dynamic;

    protected volatile CopyOnWriteHashMap mappers;

    ObjectMapper(String name, String fullPath, Explicit enabled, Dynamic dynamic, Map mappers) {
        super(name);
        if (name.isEmpty()) {
            throw new IllegalArgumentException("name cannot be empty string");
        }
        this.fullPath = fullPath;
        this.enabled = enabled;
        this.dynamic = dynamic;
        if (mappers == null) {
            this.mappers = new CopyOnWriteHashMap<>();
        } else {
            this.mappers = CopyOnWriteHashMap.copyOf(mappers);
        }
    }

    @Override
    protected ObjectMapper clone() {
        ObjectMapper clone;
        try {
            clone = (ObjectMapper) super.clone();
        } catch (CloneNotSupportedException e) {
            throw new RuntimeException(e);
        }
        return clone;
    }

    ObjectMapper copyAndReset() {
        ObjectMapper copy = clone();
        // reset the sub mappers
        copy.mappers = new CopyOnWriteHashMap<>();
        return copy;
    }

    /**
     * Build a mapping update with the provided sub mapping update.
     */
    final ObjectMapper mappingUpdate(Mapper mapper) {
        ObjectMapper mappingUpdate = copyAndReset();
        mappingUpdate.putMapper(mapper);
        return mappingUpdate;
    }

    @Override
    public String name() {
        return this.fullPath;
    }

    @Override
    public String typeName() {
        return CONTENT_TYPE;
    }

    public boolean isEnabled() {
        return this.enabled.value();
    }

    public boolean isNested() {
        return false;
    }

    public Mapper getMapper(String field) {
        return mappers.get(field);
    }

    protected void putMapper(Mapper mapper) {
        mappers = mappers.copyAndPut(mapper.simpleName(), mapper);
    }

    @Override
    public Iterator iterator() {
        return mappers.values().iterator();
    }

    public String fullPath() {
        return this.fullPath;
    }

    public final Dynamic dynamic() {
        return dynamic;
    }

    @Override
    public ObjectMapper merge(Mapper mergeWith) {
        return merge(mergeWith, MergeReason.MAPPING_UPDATE);
    }

    @Override
    public void validate(MappingLookup mappers) {
        for (Mapper mapper : this.mappers.values()) {
            mapper.validate(mappers);
        }
    }

    public ObjectMapper merge(Mapper mergeWith, MergeReason reason) {
        if ((mergeWith instanceof ObjectMapper) == false) {
            throw new IllegalArgumentException("can't merge a non object mapping [" + mergeWith.name() + "] with an object mapping");
        }
        if (mergeWith instanceof NestedObjectMapper) {
            // TODO stop NestedObjectMapper extending ObjectMapper?
            throw new IllegalArgumentException("can't merge a nested mapping [" + mergeWith.name() + "] with a non-nested mapping");
        }
        ObjectMapper mergeWithObject = (ObjectMapper) mergeWith;
        ObjectMapper merged = clone();
        merged.doMerge(mergeWithObject, reason);
        return merged;
    }

    protected void doMerge(final ObjectMapper mergeWith, MergeReason reason) {

        if (mergeWith.dynamic != null) {
            this.dynamic = mergeWith.dynamic;
        }

        if (mergeWith.enabled.explicit()) {
            if (reason == MergeReason.INDEX_TEMPLATE) {
                this.enabled = mergeWith.enabled;
            } else if (isEnabled() != mergeWith.isEnabled()){
                throw new MapperException("the [enabled] parameter can't be updated for the object mapping [" + name() + "]");
            }
        }

        for (Mapper mergeWithMapper : mergeWith) {
            Mapper mergeIntoMapper = mappers.get(mergeWithMapper.simpleName());

            Mapper merged;
            if (mergeIntoMapper == null) {
                merged = mergeWithMapper;
            } else if (mergeIntoMapper instanceof ObjectMapper) {
                ObjectMapper objectMapper = (ObjectMapper) mergeIntoMapper;
                merged = objectMapper.merge(mergeWithMapper, reason);
            } else {
                assert mergeIntoMapper instanceof FieldMapper || mergeIntoMapper instanceof FieldAliasMapper;
                if (mergeWithMapper instanceof ObjectMapper) {
                    throw new IllegalArgumentException("can't merge a non object mapping [" +
                        mergeWithMapper.name() + "] with an object mapping");
                }

                // If we're merging template mappings when creating an index, then a field definition always
                // replaces an existing one.
                if (reason == MergeReason.INDEX_TEMPLATE) {
                    merged = mergeWithMapper;
                } else {
                    merged = mergeIntoMapper.merge(mergeWithMapper);
                }
            }
            putMapper(merged);
        }
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        toXContent(builder, params, null);
        return builder;
    }

    void toXContent(XContentBuilder builder, Params params, ToXContent custom) throws IOException {
        builder.startObject(simpleName());
        if (mappers.isEmpty() && custom == null) {
            // only write the object content type if there are no properties, otherwise, it is automatically detected
            builder.field("type", CONTENT_TYPE);
        }
        if (dynamic != null) {
            builder.field("dynamic", dynamic.name().toLowerCase(Locale.ROOT));
        }
        if (isEnabled() != Defaults.ENABLED) {
            builder.field("enabled", enabled.value());
        }

        if (custom != null) {
            custom.toXContent(builder, params);
        }

        doXContent(builder, params);
        serializeMappers(builder, params);
        builder.endObject();
    }

    protected void serializeMappers(XContentBuilder builder, Params params) throws IOException {
        // sort the mappers so we get consistent serialization format
        Mapper[] sortedMappers = mappers.values().toArray(Mapper[]::new);
        Arrays.sort(sortedMappers, Comparator.comparing(Mapper::name));

        int count = 0;
        for (Mapper mapper : sortedMappers) {
            if ((mapper instanceof MetadataFieldMapper) == false) {
                if (count++ == 0) {
                    builder.startObject("properties");
                }
                mapper.toXContent(builder, params);
            }
        }
        if (count > 0) {
            builder.endObject();
        }
    }

    protected void doXContent(XContentBuilder builder, Params params) throws IOException {

    }
}