package tools.mapletools;

import provider.wz.WZFiles;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;

/**
 * @author RonanLana
 * <p>
 * This application seeks from the XMLs all mapid entries that holds the specified
 * fieldLimit.
 */
public class MapFieldLimitChecker {
    private static final int INITIAL_STRING_LENGTH = 50;
    private static final int FIELD_LIMIT = 0x400000;

    private static BufferedReader bufferedReader = null;
    private static byte status = 0;
    private static int mapid = 0;

    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[INITIAL_STRING_LENGTH];
        token.getChars(i, j, dest, 0);

        d = new String(dest);
        return (d.trim());
    }

    private static String getValue(String token) {
        int i, j;
        char[] dest;
        String d;

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

        dest = new char[INITIAL_STRING_LENGTH];
        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 getMapIdFromFilename(String name) {
        try {
            return Integer.parseInt(name.substring(0, name.indexOf('.')));
        } catch (Exception e) {
            return -1;
        }
    }

    private static void translateToken(String token) {
        if (token.contains("/imgdir")) {
            status -= 1;
        } else if (token.contains("imgdir")) {
            status += 1;

            if (status == 2) {
                String d = getName(token);
                if (!d.contentEquals("info")) {
                    forwardCursor(status);
                }
            }
        } else {
            if (status == 2) {
                String d = getName(token);

                if (d.contentEquals("fieldLimit")) {
                    int value = Integer.parseInt(getValue(token));
                    if ((value & FIELD_LIMIT) == FIELD_LIMIT) {
                        System.out.println(mapid + " " + value);
                    }
                }
            }
        }
    }

    private static void inspectMapEntry() {
        String line = null;

        try {
            while ((line = bufferedReader.readLine()) != null) {
                translateToken(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void loadMapWz() throws IOException {
        System.out.println("Reading Map.wz ...");
        ArrayList<File> files = new ArrayList<>();
        listFiles(WZFiles.MAP.getFilePath() + "/Map", files);

        for (File f : files) {
            InputStreamReader fileReader = new InputStreamReader(new FileInputStream(f), StandardCharsets.UTF_8);
            bufferedReader = new BufferedReader(fileReader);

            mapid = getMapIdFromFilename(f.getName());
            inspectMapEntry();

            bufferedReader.close();
            fileReader.close();
        }
    }

    public static void main(String[] args) {
        try {
            loadMapWz();
            System.out.println("Done!");
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}