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

public class CountCodeLines {
    private static int codeLines = 0;
    private static int whiteLines = 0;
    private static int commentLines = 0;
    private static int tatolLines = 0;
    private static boolean bComment = false;

    public static void main(String[] args) {
        StringBuffer pathName = new StringBuffer("c:/test/");
        ComputeDirectoryAndFiles(pathName, 0);
        codeLines = tatolLines - commentLines - whiteLines;
        System.out.println("Code Lines:" + codeLines + "\n" + "White Lines:"
                + whiteLines + "\n" + "Comment Lines:" + commentLines);
    }

    public static void ComputeDirectoryAndFiles(StringBuffer pathName, int level) {
        File directory = new File(pathName.toString());
        File[] files = directory.listFiles();
        String prefix = "";
        for (int i = 0; i < files.length; i++) {
            prefix += "** ";
        }
        // 當且僅當此抽象路徑名表示的文件存在且是一個目錄時，返回true；否則返回 false
        if (directory.isDirectory()) {
            for (int i = 0; i < files.length; i++) {
                if (files[i].isFile()
                        && files[i].getName().matches(
                                "^[a-zA-Z[^0-9]]\\w*.java$")) {
                    computeLines(files[i]);
                }
                if (files[i].isDirectory()) {

                    pathName.append("/" + files[i].getName());
                    level++;
                    ComputeDirectoryAndFiles(pathName, level);
                    int start = pathName.toString().length()
                            - files[i].getName().length() - 1;
                    int end = pathName.toString().length();
                    pathName.delete(start, end);
                    level--;
                }
            }
        }
    }

    public static void computeLines(File file) {
        BufferedReader bf = null;

        try {
            bf = new BufferedReader(new FileReader(file));
            String lineStr = "";
            while ((lineStr = bf.readLine()) != null) {
                // 總行數
                tatolLines++;
                // 計算空行
                whiteLines(lineStr);
                // 統計代碼行數
                commendLines(lineStr);
                // 計算代碼的行數
                // codeLines(lineStr);
            }
        } catch (FileNotFoundException e) {
            System.out.println("文件沒有找到");
        } catch (IOException ee) {
            System.out.println("輸入輸出異常　");
        } finally {
            if (bf != null) {
                try {
                    bf.close();
                    bf = null;
                } catch (Exception e) {
                    System.out.println("關閉BufferReader時出錯");
                }
            }
        }
    }

    // 判斷是否為空行
    public static void whiteLines(String lineStr) {
        if (lineStr.matches("^[\\s&&[^\\n]]*$")) {
            whiteLines++;
        }
    }

    // 判斷是否是一個注釋行
    public static void commendLines(String lineStr) {
        // 這里是單行注釋的如 /*.. */或/**. */
        if (lineStr.matches("\\s*/\\*{1,}.*(\\*/).*")) {
            commentLines++;
        }
        // 這里是多行注釋的
        // 這里的是當開始為/**或/*但是沒有 */ 關閉時
        else if (lineStr.matches("\\s*/\\*{1,}.*[^\\*/].*")) {
            commentLines++;
            bComment = true;
        } else if (true == bComment) {
            commentLines++;
            if (lineStr.matches("\\s*[\\*/]+\\s*")) {
                bComment = false;
            }
        } else if (lineStr.matches("^[\\s]*//.*")) {
            commentLines++;
        }
    }
}