/*
    This file is part of the HeavenMS MapleStory Server
    Copyleft (L) 2016 - 2018 RonanLana

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation version 3 as published by
    the Free Software Foundation. You may not use, modify or distribute
    this program under any other version of the GNU Affero General Public
    License.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package mapleemptyitemwzchecker;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;

/**
 *
 * @author RonanLana
 * 
  This application has two objectives: it reports in a detailed file all itemids which is
  currently missing either a name entry in the String.wz or an item entry in the Item.wz;
  And it removes from the String.wz XMLs all entries which misses properties on Item.wz.
 */
public class MapleEmptyItemWzChecker {
    
    static String newFile = "lib/Report.txt";
    static String outputWzPath = "lib";
    static PrintWriter printWriter = null;
    static InputStreamReader fileReader = null;
    static BufferedReader bufferedReader = null;
    
    static String wzPath = "../../wz";
    static String handbookPath = "../../handbook";
    static int initialStringLength = 50;
    static int itemFileNameSize = 13;
    
    static byte status = 0;
    static int currentItemid = 0;
    static int currentDepth = 0;
    static Stack<String> currentPath = new Stack<>();
    static String currentFile;
    
    static Map<Integer, String> stringWzItems = new HashMap<>();
    static Map<Integer, String> contentWzItems = new HashMap<>();
    
    static Set<Integer> handbookItems = new HashSet<>();
    static Set<Integer> nonPropItems;
    
    private static String getName(String token) {
        int i, j;
        char[] dest;
        String d;

        i = token.lastIndexOf("name");
        i = token.indexOf("\"", i) + 1; //lower bound of the string
        j = token.indexOf("\"", i);     //upper bound

        dest = new char[initialStringLength];
        token.getChars(i, j, dest, 0);

        d = new String(dest);
        return(d.trim());
    }
    
    private static void forwardCursor(int st) {
        String line = null;

        try {
            while(status >= st && (line = bufferedReader.readLine()) != null) {
                simpleToken(line);
            }
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }

    private static void simpleToken(String token) {
        if(token.contains("/imgdir")) {
            status -= 1;
        }
        else if(token.contains("imgdir")) {
            status += 1;
        }
    }
    
    private static void listFiles(String directoryName, ArrayList<File> files) {
        File directory = new File(directoryName);

        // get all the files from a directory
        File[] fList = directory.listFiles();
        for (File file : fList) {
            if (file.isFile()) {
                files.add(file);
            } else if (file.isDirectory()) {
                listFiles(file.getAbsolutePath(), files);
            }
        }
    }
    
    private static int getItemIdFromFilename(String name) {
        try {
            return Integer.valueOf(name.substring(0, name.indexOf('.')));
        } catch(Exception e) {
            return -1;
        }
    }
    
    private static void inspectItemWzEntry() {
        String line = null;

        try {
            while((line = bufferedReader.readLine()) != null) {
                translateItemToken(line);
            }
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    private static String currentItemPath() {
        String s = currentFile + " -> ";
        
        for (String p : currentPath) {
            s += (p + "\\");
        }
        
        return s;
    }
    
    private static void translateItemToken(String token) {
        if(token.contains("/imgdir")) {
            status -= 1;
            
            currentPath.pop();
        }
        else if(token.contains("imgdir")) {
            status += 1;
            String d = getName(token);
            
            if(status == 2) {
                currentItemid = Integer.valueOf(d);
                contentWzItems.put(currentItemid, currentItemPath());
                
                forwardCursor(status);
            } else {
                currentPath.push(d);
            }
        }
    }
    
    private static void inspectStringWzEntry() {
        String line = null;
        
        try {
            while((line = bufferedReader.readLine()) != null) {
                translateStringToken(line);
            }
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    private static void translateStringToken(String token) {
        if(token.contains("/imgdir")) {
            status -= 1;
            currentPath.pop();
        }
        else if(token.contains("imgdir")) {
            status += 1;
            String d = getName(token);
            
            if(status == currentDepth) {
                currentItemid = Integer.valueOf(d);
                stringWzItems.put(currentItemid, currentItemPath());
                //if (currentItemid >= 4000000) System.out.println("  " + currentItemid);
                
                forwardCursor(status);
            } else {
                currentPath.push(d);
            }
        }
    }
    
    private static void loadStringWzFile(String filePath, int depth) throws IOException {
        fileReader = new InputStreamReader(new FileInputStream(filePath), "UTF-8");
        bufferedReader = new BufferedReader(fileReader);

        currentFile = filePath;
        currentDepth = 2 + depth;
        //System.out.println(filePath + " depth " + depth);
        inspectStringWzEntry();
        
        bufferedReader.close();
        fileReader.close();
    }
    
    private static void loadStringWz() throws IOException {
        System.out.println("Reading String.wz ...");
        String stringWzFiles[][] = {{"Cash", "Consume", "Ins", "Pet"}, {"Etc"}, {"Eqp"}};
        String stringWzPath = wzPath + "/String.wz/";
        
        for (int i = 0; i < stringWzFiles.length; i++) {
            for (String dirFile : stringWzFiles[i]) {
                loadStringWzFile(stringWzPath + dirFile + ".img.xml", i);
            }
        }
    }
    
    private static void loadItemWz() throws IOException {
        System.out.println("Reading Item.wz ...");
        ArrayList<File> files = new ArrayList<>();
        listFiles(wzPath + "/Item.wz", files);

        for(File f : files) {
            if (f.getParentFile().getName().contentEquals("Special")) continue;
            
            //System.out.println("Parsing " + f.getAbsolutePath());
            fileReader = new InputStreamReader(new FileInputStream(f), "UTF-8");
            bufferedReader = new BufferedReader(fileReader);
            
            currentFile = f.getCanonicalPath();

            if(f.getName().length() <= itemFileNameSize) {
                inspectItemWzEntry();
            } else {    // pet file structure is similar to equips, maybe there are other item-types following this behaviour?
                int itemid = getItemIdFromFilename(f.getName());
                if(itemid < 0) {
                    continue;
                }

                currentItemid = itemid;
                contentWzItems.put(currentItemid, currentItemPath());
            }

            bufferedReader.close();
            fileReader.close();
        }
    }
    
    private static void loadCharacterWz() throws IOException {
        System.out.println("Reading Character.wz ...");
        ArrayList<File> files = new ArrayList<>();
        listFiles(wzPath + "/Character.wz", files);

        for(File f : files) {
            if (f.getParentFile().getName().contentEquals("Character.wz")) continue;
            
            int itemid = getItemIdFromFilename(f.getName());
            if(itemid < 0) {
                continue;
            }

            currentFile = f.getCanonicalPath();
            currentItemid = itemid;
            contentWzItems.put(currentItemid, currentItemPath());
        }
    }
    
    private static void calculateItemNameDiff(Set<Integer> emptyItemNames, Set<Integer> emptyNameItems) {
        for (Integer i : contentWzItems.keySet()) {
            if (!stringWzItems.containsKey(i)) {
                emptyNameItems.add(i);
            }
        }
        
        for (Integer i : stringWzItems.keySet()) {
            if (!contentWzItems.containsKey(i)) {
                emptyItemNames.add(i);
            }
        }
    }
    
    private static void readHandbookItems() throws IOException {
        System.out.println("Reading handbook ...");
        String[] handbookPaths = {"Equip", "Cash.txt", "Etc.txt", "Pet.txt", "Setup.txt", "Use.txt"};
        
        for (String path : handbookPaths) {
            readHandbookPath(handbookPath + "/" + path);
        }
    }
    
    private static void readHandbookPath(String filePath) throws IOException {
        ArrayList<File> files = new ArrayList<>();
        
        File testFile = new File(filePath);
        if (testFile.isDirectory()) {
            listFiles(filePath, files);
        } else {
            files.add(testFile);
        }
        
        for (File f : files) {
            fileReader = new InputStreamReader(new FileInputStream(f), "UTF-8");
            bufferedReader = new BufferedReader(fileReader);

            String line = null;

            try {
                while((line = bufferedReader.readLine()) != null) {
                    String[] tokens = line.split(" - ");

                    if (tokens[0].length() > 0) {
                        int itemid = Integer.valueOf(tokens[0]);
                        handbookItems.add(itemid);
                    }
                }
            }
            catch(Exception e) {
                e.printStackTrace();
            }

            bufferedReader.close();
            fileReader.close();
        }
    }
    
    private static void printReportFileHeader() {
        printWriter.println(" # Report File autogenerated from the MapleEmptyItemWzChecker feature by Ronan Lana.");
        printWriter.println(" # Generated data takes into account several data info from the server-side WZ.xmls.");
        printWriter.println();
    }
    
    private static List<Integer> getSortedItems(Set<Integer> items) {
        List<Integer> sortedItems = new ArrayList<>(items);
        Collections.sort(sortedItems);
        
        return sortedItems;
    }
    
    private static void printReportFileResults(Set<Integer> emptyItemNames, Set<Integer> emptyNameItems) {
        if (!emptyItemNames.isEmpty()) {
            printWriter.println("String.wz NAMES with no Item.wz node, " + emptyItemNames.size() + " entries:");
            
            for(Integer itemid : getSortedItems(emptyItemNames)) {
                printWriter.println("  " + itemid + " " + stringWzItems.get(itemid) + (handbookItems.contains(itemid) ? "" : " NOT FOUND"));
            }
            
            printWriter.println();
        }
        
        if (!emptyNameItems.isEmpty()) {
            printWriter.println("Item.wz ITEMS with no String.wz node, " + emptyNameItems.size() + " entries:");
            
            for(Integer itemid : getSortedItems(emptyNameItems)) {
                printWriter.println("  " + itemid + " " + contentWzItems.get(itemid) + (handbookItems.contains(itemid) ? "" : " NOT FOUND"));
            }
            
            printWriter.println();
        }
    }
    
    private static void reportItemNameDiff(Set<Integer> emptyItemNames, Set<Integer> emptyNameItems) throws IOException {
        System.out.println("Reporting results...");
        printWriter = new PrintWriter(newFile, "UTF-8");
        
        printReportFileHeader();
        printReportFileResults(emptyItemNames, emptyNameItems);
        
        printWriter.close();
    }
    
    private static void locateItemStringWzDiff() throws IOException {
        Set<Integer> emptyItemNames = new HashSet<>(), emptyNameItems = new HashSet<>();
        calculateItemNameDiff(emptyItemNames, emptyNameItems);
        
        reportItemNameDiff(emptyItemNames, emptyNameItems);
        nonPropItems = emptyItemNames;
    }
    
    private static void runEmptyItemWzChecker() throws IOException {
        readHandbookItems();

        loadCharacterWz();
        loadItemWz();
        loadStringWz();

        locateItemStringWzDiff();
    }
    
    private static void generateStringWzEntry() {
        String line = null;
        
        try {
            while((line = bufferedReader.readLine()) != null) {
                updateStringToken(line);
            }
        }
        catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    private static void updateStringToken(String token) {
        if(token.contains("/imgdir")) {
            status -= 1;
            
        }
        else if(token.contains("imgdir")) {
            status += 1;
            
            if (status == currentDepth && nonPropItems.contains(Integer.valueOf(getName(token)))) {
                forwardCursor(status);
                return;
            }
        }
        
        printWriter.println(token);
    }
    
    private static void generateStringWzFile(String filePath, int depth) throws IOException {
        fileReader = new InputStreamReader(new FileInputStream(wzPath + filePath), "UTF-8");
        bufferedReader = new BufferedReader(fileReader);
        printWriter = new PrintWriter(outputWzPath + filePath, "UTF-8");
        currentDepth = 2 + depth;
        
        //System.out.println(filePath + " depth " + depth);
        generateStringWzEntry();
        
        printWriter.close();
        bufferedReader.close();
        fileReader.close();
    }
    
    private static void generateStringWz() throws IOException {
        System.out.println("Generating clean String.wz ...");
        String stringWzFiles[][] = {{"Cash", "Consume", "Ins", "Pet"}, {"Etc"}, {"Eqp"}};
        String stringWzPath = "/String.wz/";
        
        File folder = new File(outputWzPath + "/String.wz/");
        if (!folder.exists()) {
            folder.mkdirs();
        }
        
        for (int i = 0; i < stringWzFiles.length; i++) {
            for (String dirFile : stringWzFiles[i]) {
                generateStringWzFile(stringWzPath + dirFile + ".img.xml", i);
            }
        }
    }
    
    public static void main(String[] args) {
        try {
            runEmptyItemWzChecker();
            generateStringWz();
            
            System.out.println("Done!");
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
    
}