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/*
 *    Copyright 2015-2023 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 com.mybatisflex.spring.boot;

import org.apache.ibatis.io.VFS;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.net.URL;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.text.Normalizer;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * MyBatis 的 VFS 支持。
 *  参考：https://github.com/mybatis/spring-boot-starter/blob/master/mybatis-spring-boot-autoconfigure/src/main/java/org/mybatis/spring/boot/autoconfigure/SpringBootVFS.java
 * @author Hans Westerbeek
 * @author Eddú Meléndez
 * @author Kazuki Shimizu
 * @author Michael
 */
public class SpringBootVFS extends VFS {

    private static Charset urlDecodingCharset;

    static {
        setUrlDecodingCharset(Charset.defaultCharset());
    }

    private final ResourcePatternResolver resourceResolver;

    public SpringBootVFS() {
        this.resourceResolver = new PathMatchingResourcePatternResolver(getClass().getClassLoader());
    }

    /**
     * Set the charset for decoding an encoded URL string.
     * 
     * Default is system default charset.
     * 
     *
     * @param charset the charset for decoding an encoded URL string
     * @since 2.3.0
     */
    public static void setUrlDecodingCharset(Charset charset) {
        urlDecodingCharset = charset;
    }

    private static String preserveSubpackageName(final String baseUrlString, final Resource resource,
                                                 final String rootPath) {
        try {
            return rootPath + (rootPath.endsWith("/") ? "" : "/") + Normalizer
                .normalize(URLDecoder.decode(resource.getURL().toString(), urlDecodingCharset.name()), Normalizer.Form.NFC)
                .substring(baseUrlString.length());
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    @Override
    public boolean isValid() {
        return true;
    }

    @Override
    protected List list(URL url, String path) throws IOException {
        String urlString = URLDecoder.decode(url.toString(), urlDecodingCharset.name());
        String baseUrlString = urlString.endsWith("/") ? urlString : urlString.concat("/");
        Resource[] resources = resourceResolver.getResources(baseUrlString + "**/*.class");
        return Stream.of(resources).map(resource -> preserveSubpackageName(baseUrlString, resource, path))
            .collect(Collectors.toList());
    }

}