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/**
 * Copyright (c) 2011-2013, kidzhou 周磊 ([email protected])
 *
 * 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 com.janeluo.jfinalplus.kit;

import com.google.common.collect.Lists;
import com.jfinal.kit.PathKit;
import com.jfinal.log.Log;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class ClassSearcher {

    protected static final Log LOG = Log.getLog(ClassSearcher.class);

    private String classpath = PathKit.getRootClassPath();

    private String libDir = PathKit.getWebRootPath() + File.separator + "WEB-INF" + File.separator + "lib";

    private List scanPackages = Lists.newArrayList();

    private boolean includeAllJarsInLib = false;

    private List includeJars = Lists.newArrayList();

    @SuppressWarnings("rawtypes")
	private Class target;

    @SuppressWarnings("unchecked")
    private static  List> extraction(Class clazz, List classFileList) {
        List> classList = Lists.newArrayList();
        for (String classFile : classFileList) {
            Class classInFile = Reflect.on(classFile).get();
            if (clazz.isAssignableFrom(classInFile) && clazz != classInFile) {
                classList.add((Class) classInFile);
            }
        }

        return classList;
    }

    @SuppressWarnings("rawtypes")
	public static ClassSearcher of(Class target) {
        return new ClassSearcher(target);
    }

    /**
     * @param baseDirName    查找的文件夹路径
     * @param targetFileName 需要查找的文件名
     */
    private  List findFiles(String baseDirName, String targetFileName) {
        /**
         * 算法简述: 从某个给定的需查找的文件夹出发,搜索该文件夹的所有子文件夹及文件, 若为文件,则进行匹配,匹配成功则加入结果集,若为子文件夹,则进队列。 队列不空,重复上述操作,队列为空,程序结束,返回结果。
         */
        List classFiles = Lists.newArrayList();
        File baseDir = new File(baseDirName);
        if (!baseDir.exists() || !baseDir.isDirectory()) {
            LOG.error("search error:" + baseDirName + "is not a dir!");
        } else {
            String[] files = baseDir.list();
            for (int i = 0; i < files.length; i++) {
                File file = new File(baseDirName + File.separator + files[i]);
                if (file.isDirectory()) {
                    classFiles.addAll(findFiles(baseDirName + File.separator + files[i], targetFileName));
                } else {
                    if (wildcardMatch(targetFileName, file.getName())) {
                        String fileName = file.getAbsolutePath();
                        String open = classpath + File.separator;
                        String close = ".class";
                        int start = fileName.indexOf(open);
                        int end = fileName.indexOf(close, start + open.length());
                        String className = fileName.substring(start + open.length(), end).replace(File.separator, ".");
                        classFiles.add(className);
                    }
                }
            }
        }
        return classFiles;
    }

    /**
     * 通配符匹配
     *
     * @param pattern  通配符模式
     * @param fileName 待匹配的字符串
     */
    private static boolean wildcardMatch(String pattern, String fileName) {
        int patternLength = pattern.length();
        int strLength = fileName.length();
        int strIndex = 0;
        char ch;
        for (int patternIndex = 0; patternIndex < patternLength; patternIndex++) {
            ch = pattern.charAt(patternIndex);
            if (ch == '*') {
                // 通配符星号*表示可以匹配任意多个字符
                while (strIndex < strLength) {
                    if (wildcardMatch(pattern.substring(patternIndex + 1), fileName.substring(strIndex))) {
                        return true;
                    }
                    strIndex++;
                }
            } else if (ch == '?') {
                // 通配符问号?表示匹配任意一个字符
                strIndex++;
                if (strIndex > strLength) {
                    // 表示str中已经没有字符匹配?了。
                    return false;
                }
            } else {
                if ((strIndex >= strLength) || (ch != fileName.charAt(strIndex))) {
                    return false;
                }
                strIndex++;
            }
        }
        return strIndex == strLength;
    }

    @SuppressWarnings("unchecked")
	public  List> search() {
        List classFileList = Lists.newArrayList();
        if (scanPackages.isEmpty()) {
            classFileList = findFiles(classpath, "*.class");
        } else {
            for (String scanPackage : scanPackages) {
                classFileList = findFiles(classpath + File.separator + scanPackage.replaceAll("\\.", "\\" + File.separator), "*.class");
            }
        }
        classFileList.addAll(findjarFiles(libDir));
        return extraction(target, classFileList);
    }

    /**
     * 查找jar包中的class
     */
    private List findjarFiles(String baseDirName) {
        List classFiles = Lists.newArrayList();
        File baseDir = new File(baseDirName);
        if (!baseDir.exists() || !baseDir.isDirectory()) {
            LOG.error("file search error:" + baseDirName + " is not a dir!");
        } else {
            File[] files = baseDir.listFiles();
            for (File file : files) {
                if (file.isDirectory()) {
                    classFiles.addAll(findjarFiles(file.getAbsolutePath()));
                } else {
                    if (includeAllJarsInLib || includeJars.contains(file.getName())) {
                        JarFile localJarFile = null;
                        try {
                            localJarFile = new JarFile(new File(baseDirName + File.separator + file.getName()));
                            Enumeration entries = localJarFile.entries();
                            while (entries.hasMoreElements()) {
                                JarEntry jarEntry = entries.nextElement();
                                String entryName = jarEntry.getName();
                                if (scanPackages.isEmpty()) {
                                    if (!jarEntry.isDirectory() && entryName.endsWith(".class")) {
                                        String className = entryName.replaceAll(File.separator, ".").substring(0, entryName.length() - 6);
                                        classFiles.add(className);
                                    }
                                } else {
                                    for (String scanPackage : scanPackages) {
                                        scanPackage = scanPackage.replaceAll("\\.", "\\" + File.separator);
                                        if (!jarEntry.isDirectory() && entryName.endsWith(".class") && entryName.startsWith(scanPackage)) {
                                            String className = entryName.replaceAll(File.separator, ".").substring(0, entryName.length() - 6);
                                            classFiles.add(className);
                                        }
                                    }
                                }
                            }
                        } catch (IOException e) {
                            e.printStackTrace();
                        } finally {
                            try {
                                if (localJarFile != null) {
                                    localJarFile.close();
                                }
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }

            }
        }
        return classFiles;
    }

    @SuppressWarnings("rawtypes")
	public ClassSearcher(Class target) {
        this.target = target;
    }

    public ClassSearcher injars(List jars) {
        if (jars != null) {
            includeJars.addAll(jars);
        }
        return this;
    }

    public ClassSearcher inJars(String... jars) {
        if (jars != null) {
            for (String jar : jars) {
                includeJars.add(jar);
            }
        }
        return this;
    }

    public ClassSearcher includeAllJarsInLib(boolean includeAllJarsInLib) {
        this.includeAllJarsInLib = includeAllJarsInLib;
        return this;
    }

    public ClassSearcher classpath(String classpath) {
        this.classpath = classpath;
        return this;
    }

    public ClassSearcher libDir(String libDir) {
        this.libDir = libDir;
        return this;
    }

    public ClassSearcher scanPackages(List scanPaths) {
        if (scanPaths != null) {
            scanPackages.addAll(scanPaths);
        }
        return this;
    }
}




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