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package com.fasterxml.jackson.databind.ser.impl;

import java.util.Iterator;
import java.util.Map.Entry;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.io.SerializedString;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonObjectFormatVisitor;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.util.NameTransformer;

/**
 * Variant of {@link BeanPropertyWriter} which will handle unwrapping
 * of JSON Object (including of properties of Object within surrounding
 * JSON object, and not as sub-object).
 */
public class UnwrappingBeanPropertyWriter
    extends BeanPropertyWriter
    implements java.io.Serializable
{
    private static final long serialVersionUID = 1L;

    /**
     * Transformer used to add prefix and/or suffix for properties
     * of unwrapped POJO.
     */
    protected final NameTransformer _nameTransformer;

    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */

    public UnwrappingBeanPropertyWriter(BeanPropertyWriter base, NameTransformer unwrapper) {
        super(base);
        _nameTransformer = unwrapper;
    }

    protected UnwrappingBeanPropertyWriter(UnwrappingBeanPropertyWriter base, NameTransformer transformer,
            SerializedString name) {
        super(base, name);
        _nameTransformer = transformer;
    }

    @Override
    public UnwrappingBeanPropertyWriter rename(NameTransformer transformer)
    {
        String oldName = _name.getValue();
        String newName = transformer.transform(oldName);

        // important: combine transformers:
        transformer = NameTransformer.chainedTransformer(transformer, _nameTransformer);
    
        return _new(transformer, new SerializedString(newName));
    }

    /**
     * Overridable factory method used by sub-classes
     *
     * @since 2.6.0
     */
    protected UnwrappingBeanPropertyWriter _new(NameTransformer transformer, SerializedString newName)
    {
        return new UnwrappingBeanPropertyWriter(this, transformer, newName);
    }

    /*
    /**********************************************************
    /* Overrides, public methods
    /**********************************************************
     */

    @Override
    public boolean isUnwrapping() {
        return true;
    }

    @Override
    public void serializeAsField(Object bean, JsonGenerator gen, SerializerProvider prov)
            throws Exception
    {
        final Object value = get(bean);
        if (value == null) {
            // Hmmh. I assume we MUST pretty much suppress nulls, since we
            // can't really unwrap them...
            return;
        }
        JsonSerializer