package mdhClassReplace;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

public class mdhClassReplace {

	public static void dirTree(File dir, List classOld, List classNew) {
		File[] subdirs = dir.listFiles();
		for (File subdir : subdirs) {
			if (subdir.isDirectory()) {
				dirTree(subdir, classOld, classNew);
			} else {
				doFile(subdir, classOld, classNew);
			}
		}
	}

	public static void doFile(File file, List classOld, List classNew) {
		String extension = "";
		int i = file.getName().lastIndexOf('.');
		if (i > 0) {
			extension = file.getName().substring(i + 1).toLowerCase();
		}

		if (extension.contentEquals("sqm")
				|| extension.contentEquals("sqf")
				|| extension.contentEquals("sqs")
				|| extension.contentEquals("ext")) {
			writeLog("checkFile: " + file.getAbsolutePath());
			rplTxt(file.getAbsolutePath(), classOld, classNew);
		}
	}

	public static void rplTxt(String fileName, List classOld, List classNew) {

		Path path = Paths.get(fileName);
		Charset charset = StandardCharsets.UTF_8;

		String content = null;

		try {
			content = new String(Files.readAllBytes(path), charset);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		String contentLower = content.toLowerCase();

		boolean foundClass = false;
		for (int i = 0; i < classOld.size(); i++) {
			String classOldS = "\"" + classOld.get(i).toString() + "\"";
			String classNewS = "\"" + classNew.get(i).toString() + "\"";
			if (contentLower.contains(classOldS.toLowerCase())) {
				foundClass = true;
				content = content.replaceAll("(?i)"+classOldS, classNewS);
				writeLog("changedClass: " + classOldS + " to " + classNewS);								
			}
			
			classOldS = "'" + classOld.get(i).toString() + "'";
			classNewS = "'" + classNew.get(i).toString() + "'";
			if (contentLower.contains(classOldS.toLowerCase())) {
				foundClass = true;
				content = content.replaceAll("(?i)"+classOldS, classNewS);
				writeLog("changedClass: " + classOldS + " to " + classNewS);
			}
		}

		if (foundClass) {
			try {
				Files.write(path, content.getBytes(charset));
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	public static void writeLog(String logTxt) {
		PrintWriter out;
		logTxt = new java.util.Date() + " --> " + logTxt;
		try {
			out = new PrintWriter(new BufferedWriter(new FileWriter(
					"mdhClassReplaceLog.txt", true)));
			out.println(logTxt);
			System.out.println(logTxt);
			out.close();
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}

	}

	public static void main(String[] args) {

		writeLog("-------------------------------");
		writeLog("pgmStart");
		String currentDir = System.getProperty("user.dir");
		writeLog("currentDir: " + currentDir);

		File f = new File(currentDir);
		File c = new File(currentDir.concat("\\mdhClassReplace.cfg"));

		if (c.exists() && !c.isDirectory()) {

			String classOldS = "";
			String classNewS = "";
			List classOld = new ArrayList();
			List classNew = new ArrayList();

			try {
				BufferedReader in = new BufferedReader(new FileReader(c));
				String actLine = null;
				while ((actLine = in.readLine()) != null) {

					int seperatorPos = actLine.indexOf(";");
					classOldS = actLine.substring(0, seperatorPos);
					classNewS = actLine.substring(seperatorPos + 1);

					if (!classOldS.isEmpty() && !classNewS.isEmpty()) {
						classOld.add(classOldS);
						classNew.add(classNewS);
					}

				}
			} catch (IOException e) {
				e.printStackTrace();
				writeLog("pgmError: error while reading mdhClassReplace.cfg");
				System.exit(-1);
			}

			dirTree(f, classOld, classNew);
		} else {
			writeLog("mdhClassReplace.cfg not found");
		};
		
		writeLog("pgmEnd");
	}
}