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/**
 * Copyright 2011-2012 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
 *
 *      http://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 net.sf.common.util;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

/**
 * @author Steve M. Jung
 * @since 2012. 2. 16. (version 1.0.6)
 */
public class ResourceUtils {
	private static final ResourcePatternResolver RESOURCE_PATTERN_RESOLVER = new PathMatchingResourcePatternResolver();

	public static boolean isDirectory(String path) {
		ValueUtils.assertNotNull("path", path);
		path = path.trim();

		if (path.startsWith("classpath*:")) {
			return isDirectoryByClasspath(path.substring(11));
		} else if (path.startsWith("classpath:")) {
			return isDirectoryByClasspath(path.substring(10));
		}

		File file;
		try {
			file = org.springframework.util.ResourceUtils.getFile(path);
		} catch (FileNotFoundException e) {
			return isDirectoryByClasspath(path);
		}
		return file.exists() ? file.isDirectory() : isDirectoryByClasspath(path);
	}
	private static boolean isDirectoryByClasspath(String classpath) {
		classpath = classpath.trim();
		Resource resource = new ClassPathResource(classpath);
		if (resource.exists()) {
			try {
				return resource.contentLength() == 0;
			} catch (IOException e) {
				return false;
			}
		}
		try {
			classpath = "classpath*:" + classpath + (classpath.endsWith("/") ? "*" : "/*");
			Resource[] resources = RESOURCE_PATTERN_RESOLVER.getResources(classpath);
			return !ValueUtils.isEmpty(resources);
		} catch (IOException e) {
			return false;
		}
	}

	public static boolean exists(String path) {
		ValueUtils.assertNotNull("path", path);
		path = path.trim();

		if (path.startsWith("classpath*:")) {
			return existsByClasspath(path.substring(11));
		} else if (path.startsWith("classpath:")) {
			return existsByClasspath(path.substring(10));
		}

		File file;
		try {
			file = org.springframework.util.ResourceUtils.getFile(path);
		} catch (FileNotFoundException e) {
			return existsByClasspath(path);
		}
		return file.exists() || existsByClasspath(path);
	}
	private static boolean existsByClasspath(String classpath) {
		classpath = classpath.trim();
		Resource resource = new ClassPathResource(classpath);
		if (resource.exists())
			return true;
		try {
			classpath = "classpath*:" + classpath + (classpath.endsWith("/") ? "*" : "/*");
			Resource[] resources = RESOURCE_PATTERN_RESOLVER.getResources(classpath);
			return !ValueUtils.isEmpty(resources);
		} catch (IOException e) {
			return false;
		}
	}

	public static String readText(String path) throws IOException {
		ValueUtils.assertNotNull("path", path);
		path = path.trim();

		if (path.startsWith("classpath*:")) {
			path = path.substring(11);
			return readTextByClasspath(path);
		} else if (path.startsWith("classpath:")) {
			path = path.substring(10);
			return readTextByClasspath(path);
		}

		File file;
		try {
			file = org.springframework.util.ResourceUtils.getFile(path);
		} catch (FileNotFoundException e) {
			try {
				return readTextByClasspath(path);
			} catch (IOException e1) {
			}
			throw e;
		}
		if (file.exists())
			return FileUtils.readFileToString(file, "UTF-8");

		try {
			return readTextByClasspath(path);
		} catch (IOException e1) {
			throw new FileNotFoundException("path: " + path);
		}
	}

	private static String readTextByClasspath(String classpath) throws IOException {
		classpath = classpath.trim();
		Resource resource = new ClassPathResource(classpath);
		if (resource.exists())
			return IOUtils.toString(resource.getInputStream(), "UTF-8");
		if (isDirectoryByClasspath(classpath))
			throw new IllegalArgumentException("Cannot read directory as text by classpath: " + classpath);
		throw new IllegalArgumentException("Couldn't find resource by classpath: " + classpath);
	}
}