/*
 * Copyright 2012-2022 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.convert;

import java.util.function.Consumer;
import java.util.stream.Stream;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;

import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.GenericConverter;
import org.springframework.format.Formatter;
import org.springframework.format.support.FormattingConversionService;

/**
 * Factory for creating a {@link Stream stream} of {@link Arguments} for use in a
 * {@link ParameterizedTest parameterized test}.
 *
 * @author Phillip Webb
 * @author Andy Wilkinson
 */
final class ConversionServiceArguments {

	private ConversionServiceArguments() {
	}

	static Stream<? extends Arguments> with(Formatter<?> formatter) {
		return with((conversionService) -> conversionService.addFormatter(formatter));
	}

	static Stream<? extends Arguments> with(GenericConverter converter) {
		return with((conversionService) -> conversionService.addConverter(converter));
	}

	static Stream<? extends Arguments> with(Consumer<FormattingConversionService> initializer) {
		FormattingConversionService withoutDefaults = new FormattingConversionService();
		initializer.accept(withoutDefaults);
		return Stream.of(
				Arguments.of(new NamedConversionService(withoutDefaults, "Without defaults conversion service")),
				Arguments.of(new NamedConversionService(new ApplicationConversionService(),
						"Application conversion service")));
	}

	static boolean isApplicationConversionService(ConversionService conversionService) {
		if (conversionService instanceof NamedConversionService namedConversionService) {
			return isApplicationConversionService(namedConversionService.delegate);
		}
		return conversionService instanceof ApplicationConversionService;
	}

	static class NamedConversionService implements ConversionService {

		private final ConversionService delegate;

		private final String name;

		NamedConversionService(ConversionService delegate, String name) {
			this.delegate = delegate;
			this.name = name;
		}

		@Override
		public boolean canConvert(Class<?> sourceType, Class<?> targetType) {
			return this.delegate.canConvert(sourceType, targetType);
		}

		@Override
		public boolean canConvert(TypeDescriptor sourceType, TypeDescriptor targetType) {
			return this.delegate.canConvert(sourceType, targetType);
		}

		@Override
		public <T> T convert(Object source, Class<T> targetType) {
			return this.delegate.convert(source, targetType);
		}

		@Override
		public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
			return this.delegate.convert(source, sourceType, targetType);
		}

		@Override
		public String toString() {
			return this.name;
		}

	}

}
