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package com.guanmengyuan.spring.ex.common.model.converter;

import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.ConverterFactory;
import org.springframework.lang.NonNull;

import com.guanmengyuan.spring.ex.common.model.enums.ParamEnum;
import com.guanmengyuan.spring.ex.common.model.enums.ResEnum;
import com.guanmengyuan.spring.ex.common.model.exception.ServiceException;

import lombok.SneakyThrows;

/**
 * 任何类型转枚举工厂类
 */
public class AnyToEnumConverterFactory implements ConverterFactory {

    @Override
    @NonNull
    public  Converter getConverter(@NonNull Class targetType) {
        return new AnyToEnum<>(targetType);
    }

    private record AnyToEnum(Class enumType) implements Converter {
        @SuppressWarnings("unchecked")
        @Override
        @SneakyThrows
        public T convert(@NonNull String source) {
            if (source.isEmpty()) {
                return null;
            }
            if (!enumType.isEnum()) {
                throw new ServiceException(ResEnum.NOT_AN_ENUMERATION);
            }
            return (T) enumType.getEnumConstants()[0].getInstanceByType(source.trim());
        }
    }
}