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package com.alibaba.fastjson2.writer;

import com.alibaba.fastjson2.JSONWriter;

import java.lang.reflect.Type;
import java.util.Locale;
import java.util.Optional;

final class ObjectWriterImplOptional
        extends ObjectWriterPrimitiveImpl {
    static final ObjectWriterImplOptional INSTANCE = new ObjectWriterImplOptional(null, null);

    Type valueType;
    long features;

    final String format;
    final Locale locale;

    public static ObjectWriterImplOptional of(String format, Locale locale) {
        if (format == null) {
            return INSTANCE;
        }

        return new ObjectWriterImplOptional(format, locale);
    }

    public ObjectWriterImplOptional(String format, Locale locale) {
        this.format = format;
        this.locale = locale;
    }

    public ObjectWriterImplOptional(Type valueType, String format, Locale locale) {
        this.valueType = valueType;
        this.format = format;
        this.locale = locale;
    }

    @Override
    public void writeJSONB(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
        if (object == null) {
            jsonWriter.writeNull();
            return;
        }

        Optional optional = (Optional) object;
        if (!optional.isPresent()) {
            jsonWriter.writeNull();
            return;
        }

        Object value = optional.get();
        ObjectWriter objectWriter = jsonWriter.getObjectWriter(value.getClass());
        objectWriter.writeJSONB(jsonWriter, value, fieldName, null, features);
    }

    @Override
    public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
        if (object == null) {
            jsonWriter.writeNull();
            return;
        }

        Optional optional = (Optional) object;
        if (!optional.isPresent()) {
            jsonWriter.writeNull();
            return;
        }

        Object value = optional.get();
        Class valueClass = value.getClass();
        ObjectWriter valueWriter = null;
        if (format != null) {
            valueWriter = FieldWriter.getObjectWriter(null, null, format, locale, valueClass);
        }

        if (valueWriter == null) {
            valueWriter = jsonWriter.getObjectWriter(valueClass);
        }
        valueWriter.write(jsonWriter, value, fieldName, valueType, this.features);
    }
}