/*
    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 mapleskillbookchancefetcher;

import life.MapleLifeFactory;
import life.MapleMonsterStats;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import java.io.*;
import java.util.Collections;
import java.util.Comparator;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import tools.DatabaseConnection;
import tools.Pair;

/**
 *
 * @author RonanLana
 * 
 * This application traces missing meso drop data on the underlying DB (that must be
 * defined on the DatabaseConnection file of this project) and generates a
 * SQL file that proposes missing drop entries for the drop_data table.
 * 
 * The meso range is calculated accordingly with the target mob stats, such as level
 * and if it's a boss or not, similarly as how it has been done for the actual meso
 * drops.
 * 
 */
public class MapleSkillbookChanceFetcher {

    private static PrintWriter printWriter;
    private static String newFile = "lib/skillbook_drop_data.sql";
    
    private static Map<Integer, MapleMonsterStats> mobStats;
    private static Map<Pair<Integer, Integer>, Integer> skillbookChances = new HashMap<>();
    
    private static List<Entry<Pair<Integer, Integer>, Integer>> sortedSkillbookChances() {
        List<Entry<Pair<Integer, Integer>, Integer>> skillbookChancesList = new ArrayList<>(skillbookChances.entrySet());
        
        Collections.sort(skillbookChancesList, new Comparator<Entry<Pair<Integer, Integer>, Integer>>() {
            @Override
            public int compare(Entry<Pair<Integer, Integer>, Integer> o1, Entry<Pair<Integer, Integer>, Integer> o2) {
                if (o1.getKey().getLeft().equals(o2.getKey().getLeft())) {
                    return o1.getKey().getRight() < o2.getKey().getRight() ? -1 : (o1.getKey().getRight().equals(o2.getKey().getRight()) ? 0 : 1);
                }
                
                return (o1.getKey().getLeft() < o2.getKey().getLeft()) ? -1 : 1;
            }
        });
        
        return skillbookChancesList;
    }
            
    private static boolean isLegendSkillUpgradeBook(int itemid) {
        int itemidBranch = itemid / 10000;
        return (itemidBranch == 228 && itemid >= 2280013 || itemidBranch == 229 && itemid >= 2290126);      // drop rate of Legends are higher
    }
    
    private static void fetchSkillbookDropChances() {
        Connection con = DatabaseConnection.getConnection();
        
        try {
            PreparedStatement ps = con.prepareStatement("SELECT dropperid, itemid FROM drop_data WHERE itemid >= 2280000 AND itemid < 2300000");
            ResultSet rs = ps.executeQuery();
            
            while(rs.next()) {
                int mobid = rs.getInt("dropperid");
                int itemid = rs.getInt("itemid");
                
                int expectedChance = 250;
                
                if (mobStats.get(mobid) != null) {
                    int level = mobStats.get(mobid).getLevel();
                    expectedChance *= Math.max(2, (level - 80) / 15);
                    
                    if (mobStats.get(mobid).isBoss()) {
                        expectedChance *= 20;
                    } else {
                        expectedChance *= 1;
                    }
                } else {
                    expectedChance = 1287;
                }
                
                if (isLegendSkillUpgradeBook(itemid)) {     // drop rate of Legends seems to be higher than explorers, in retrospect from values in DB
                    expectedChance *= 3;
                }
                
                skillbookChances.put(new Pair<>(mobid, itemid), expectedChance);
            }
            
            rs.close();
            ps.close();
            con.close();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
    
    private static void printSkillbookChanceUpdateSqlHeader() {
        printWriter.println(" # SQL File autogenerated from the MapleSkillbookChanceFetcher feature by Ronan Lana.");
        printWriter.println(" # Generated data takes into account mob stats such as level and boss for the chance rates.");
        printWriter.println();
        
        printWriter.println("  REPLACE INTO drop_data (`dropperid`, `itemid`, `minimum_quantity`, `maximum_quantity`, `questid`, `chance`) VALUES");
    }
    
    private static void generateSkillbookChanceUpdateFile() {
        try {
            printWriter = new PrintWriter(newFile, "UTF-8");
            
            printSkillbookChanceUpdateSqlHeader();
            
            List<Entry<Pair<Integer, Integer>, Integer>> skillbookChancesList = sortedSkillbookChances();
            for (Entry<Pair<Integer, Integer>, Integer> e : skillbookChancesList) {
                printWriter.println("(" + e.getKey().getLeft() + ", " + e.getKey().getRight() + ", 1, 1, 0, " + e.getValue() + "),");
            }
            
            printWriter.close();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        // load mob stats from WZ
        mobStats = MapleLifeFactory.getAllMonsterStats();
        
        fetchSkillbookDropChances();
        generateSkillbookChanceUpdateFile();
    }
    
}