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package com.hubspot.algebra;

import static com.hubspot.algebra.ResultModule.CASE_FIELD_NAME;
import static com.hubspot.algebra.ResultModule.ERROR_FIELD_NAME;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.std.EnumSerializer;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import com.hubspot.algebra.ResultModule.Case;

public class ResultSerializer extends StdSerializer> {
  ResultSerializer(JavaType type) {
    super(type);
  }

  @Override
  public void serialize(Result value, JsonGenerator gen, SerializerProvider provider) throws IOException {
    gen.writeStartObject();

    if (value.isErr()) {
      Object err = value.unwrapErrOrElseThrow();
      JsonSerializer errorSerializer = provider.findTypedValueSerializer(err.getClass(), true, null);

      if (errorSerializer instanceof EnumSerializer) {
        EnumSerializer enumSerializer = ((EnumSerializer) errorSerializer);
        Enum enumErr = ((Enum) err);

        gen.writeFieldName(ERROR_FIELD_NAME);
        enumSerializer.serialize(enumErr, gen, provider);
      } else {
        JsonSerializer