package com.ankurm.jackson3.part4custom;

import tools.jackson.core.JsonGenerator;
import tools.jackson.databind.SerializationContext;
import tools.jackson.databind.ser.std.StdSerializer;

import java.math.RoundingMode;

/**
 * Post: Custom Serialisers and Mix-ins — https://ankurm.com/jackson-custom-serializer-mixin/
 * Section: "Writing a Custom Serialiser"
 *
 * Three Jackson 3 differences from the code in the post:
 *   1. Package is tools.jackson.databind.ser.std, not com.fasterxml.jackson...
 *   2. The third parameter is SerializationContext, not SerializerProvider.
 *   3. There is no `throws IOException` — JacksonException is unchecked in Jackson 3.
 *
 * (StdSerializer still exists under its old name; only JsonSerializer was renamed,
 *  to ValueSerializer. StdSerializer extends ValueSerializer.)
 */
public class E01MoneyValueSerializer extends StdSerializer<Money> {

    public E01MoneyValueSerializer() {
        super(Money.class);
    }

    @Override
    public void serialize(Money moneyValue, JsonGenerator jsonGenerator, SerializationContext ctxt) {
        jsonGenerator.writeStartObject();
        // Write the amount rounded to 2 decimal places
        jsonGenerator.writeNumberProperty("amount",
                moneyValue.amount().setScale(2, RoundingMode.HALF_UP));
        // Write the ISO currency code in uppercase
        jsonGenerator.writeStringProperty("currency",
                moneyValue.currencyCode().toUpperCase());
        jsonGenerator.writeEndObject();
    }
}