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package io.bit3.jsass.function.arguments.converter;

import io.bit3.jsass.context.Context;
import io.bit3.jsass.context.ImportStack;
import io.bit3.jsass.function.FunctionArgumentSignature;
import io.bit3.jsass.function.FunctionArgumentSignatureFactory;
import io.bit3.jsass.type.SassNull;
import io.bit3.jsass.type.SassString;
import io.bit3.jsass.type.TypeUtils;

import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.List;

public class CharacterArgumentConverter implements ArgumentConverter {

  @Override
  public Object convert(
      List remainingArguments, ImportStack importStack, Context context) {
    if (remainingArguments.isEmpty()) {
      return null;
    }

    Object value = remainingArguments.remove(0);

    // ignore null value
    if (null == value || value instanceof SassNull) {
      return null;
    }

    // value is already in a compatible type
    if (TypeUtils.isaCharacter(value.getClass())) {
      return value;
    }

    if (value instanceof SassString) {
      value = ((SassString) value).getValue();
    }

    return value.toString().charAt(0);
  }

  @Override
  public List argumentSignatures(
      Object object, Method method, Parameter parameter, FunctionArgumentSignatureFactory factory
  ) {
    return factory.createDefaultArgumentSignature(parameter);
  }
}