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package pl.touk.nussknacker.engine.spel.internal;

import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.ConditionalGenericConverter;
import org.springframework.lang.Nullable;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Set;

public class ConversionHandler {
    public static final class ArrayToListConverter implements ConditionalGenericConverter {

        private final ConversionService conversionService;


        public ArrayToListConverter(ConversionService conversionService) {
            this.conversionService = conversionService;
        }


        @Override
        public Set getConvertibleTypes() {
            return Set.of(
                new ConvertiblePair(Object[].class, Iterable.class),
                new ConvertiblePair(Object[].class, Collection.class),
                new ConvertiblePair(Object[].class, List.class)
            );
        }

        @Override
        public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
            return ConversionUtils.canConvertElements(
                sourceType.getElementTypeDescriptor(),
                targetType.getElementTypeDescriptor(),
                conversionService
            );
        }

        @Override
        @Nullable
        public Object convert(
            @Nullable Object source,
            TypeDescriptor sourceTypeDescriptor,
            TypeDescriptor targetTypeDescriptor
        ) {
            if (source == null) {
                return null;
            }
            return ConversionHandler.convertArrayToList(source);
        }

    }

    public static List