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package main;

import java.util.HashMap;
import java.util.Random;
import java.util.Stack;
import java.util.logging.Logger;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.block.Block;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.block.BlockIgniteEvent;
import org.bukkit.event.block.BlockPlaceEvent;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.event.entity.FoodLevelChangeEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.event.player.PlayerQuitEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.event.player.PlayerToggleSneakEvent;
import org.bukkit.event.weather.WeatherChangeEvent;
import org.bukkit.inventory.ItemStack;

/**
 *
 * @author Harry
 */

public class zombieMain extends JavaPlugin implements Listener
{
    // Console references the Minecraft console
    public static Logger console = null;
    // The hashmap contains all existing human players
    private static HashMap<String, String> humans;
    // This is only true when the game is in progress
    public static Boolean gameRunning = false;
    // This is true when the map is resetting, it is on before a game has begun
    public static Boolean resetting = true;
    // Debug enables debug messages
    private static final Boolean debug = false;
    // The stack stores changed blocks for rollbacks
    private static Stack blocks_changed = new Stack();
    // The time limit is how long between each round
    public static final long timeLimit = 300000;
    // Last time stores the time when the round begins
    public static long lastTime = 0;
    // Mark zombies is used to decide whether to mark humans with lightning or not
    public static Boolean mark_zombies = false;
    // This handles which round should be started
    public static short round = 1;

    public void onDisable()
    {
        // Dispose of possible large data
        blocks_changed.clear();
        humans.clear();
        console.info("[StonedZombie] Stoneharry - Disabled!");
    }

    public void onEnable()
    {
        console = Logger.getLogger("Minecraft");
        humans = new HashMap<String, String>();
        // Register events
        getServer().getPluginManager().registerEvents(this, this);
        // This runs every ~32 seconds
        getServer().getScheduler().scheduleAsyncRepeatingTask(this, new Runnable() {
           public void run()
           {
               if (gameRunning && !resetting)
               {
                   // Get time elapsed
                   int result = (int)(System.currentTimeMillis()-lastTime);
                   // See if the time elapsed is more than the time limit
                   if (result > timeLimit)
                   {
                       Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "The time limit is up, humans have won!");
                       prepareReset();
                   }
                   else
                   {
                       // Get time remaining
                       int seconds = (int)(timeLimit / 1000) - ( result / 1000 );
                       int minutes = 0;
                       while (seconds > 59)
                       {
                           seconds = seconds - 60;
                           minutes = minutes + 1;
                       }
                       if (minutes == 0)
                       {
                            Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "There is " + String.valueOf(seconds) + " seconds remaining!");
                       }
                       else
                       {
                            Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "There is " + String.valueOf(minutes) + " minutes and " + String.valueOf(seconds) + " seconds remaining!");
                       }
                       // If mark zombies put lightning on humans
                       if (mark_zombies)
                       {
                           Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "The lightning shows where the remaining humans are!");
                           for (String name : humans.values())
                           {
                               Player player = Bukkit.getPlayer(name);
                               if (player != null)
                               {
                                   if (player.isOnline())
                                   {
                                       Bukkit.getWorld("world").strikeLightningEffect(player.getLocation());
                                   }
                               }
                           }
                           mark_zombies = false;
                       }
                       else
                       {
                           mark_zombies = true;
                       }
                   }
                    // Check for offline humans and remove them if found
                    for (String name : humans.values())
                    {
                        if (Bukkit.getPlayer(name) == null)
                        {
                            humans.remove(name);
                        }
                        else
                        {
                            if (!Bukkit.getPlayer(name).isOnline())
                            {
                                humans.remove(name);
                            }
                        }
                    }
               }
           }
        }, 700L, 700L);
        console.info("[StonedZombie] Stoneharry - Enabled!");
    }

    @EventHandler
    public void onPlayerMove(PlayerMoveEvent event)
    {
        try
        {
            if (gameRunning)
            {
                Player plr = event.getPlayer();
                // Get nearby players
                for (Entity entity : plr.getNearbyEntities(0.7, 0.7, 0.7))
                {
                    if (entity instanceof Player)
                    {
                        Player target = (Player)entity;
                        // Check to see if the moving person is a zombie and the other a human
                        if (humans.containsKey(target.getName()) && !humans.containsKey(plr.getName()))
                        {
                            // The person will no longer be a human
                            humans.remove(target.getName());
                            // Set the messages and change his name
                            Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + plr.getName() + " has infected " + target.getName() + "!");
                            target.setDisplayName("[" + ChatColor.RED + "Zombie" + ChatColor.WHITE + "] " + target.getName());
                            //target.setPlayerListName("[Zombie] " + target.getName());
                            // Check to see if all humans have been found
                            if (humans.isEmpty() && gameRunning && !resetting)
                            {
                                Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "All humans have been caught! The game will end in 10 seconds...");
                                prepareReset();
                            }
                            else
                            {
                                Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "There are " + String.valueOf(humans.size()) + " humans remaining!");
                            }
                        }
                    }
                }
            }
            else
            {
                // Check to start the game
                Player players[] = Bukkit.getOnlinePlayers();
                if (players.length > 1)
                {
                    // Set the time the round started
                    lastTime = System.currentTimeMillis();

                    // A not very random, random number generator
                     Random ran = new Random();
                     int x = ran.nextInt(players.length - 1);
                     for (int i = 0; i < players.length; i++)
                     {
                         // Reset inventory
                         players[i].getInventory().clear();
                         players[i].getInventory().setArmorContents(null);
                         // Add items
                         ItemStack reward = new ItemStack(3, 20);
                         players[i].getInventory().addItem(reward);
                         // Correct method unknown (?)
                         players[i].updateInventory();
                         // If random number = player in online players, set to zombie
                         if (i == x)
                         {
                             Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "The game has begun and " + players[i].getName() + " is the first zombie!");
                             players[i].setDisplayName("[" + ChatColor.RED + "Zombie" + ChatColor.WHITE + "] " + players[i].getName());
                             //players[i].setPlayerListName("[Zombie] " + players[i].getName());
                             handleTeleport(players[i], false);
                         }
                         // Set to human
                         else
                         {
                             players[i].setDisplayName("[" + ChatColor.GREEN + "Human" + ChatColor.WHITE + "] " + players[i].getName());
                             //players[i].setPlayerListName("[Human] " + players[i].getName());
                             humans.put(players[i].getName(), players[i].getName());
                             handleTeleport(players[i], true);
                         }
                     }
                     // Set global variables
                     gameRunning = true;
                     resetting = false;
                }
            }
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }
    }

    // This function just sets the variable to show the round has ended but it is waiting 10 seconds
    public void prepareReset()
    {
        resetting = true;
        getServer().getScheduler().scheduleAsyncDelayedTask(this, new Runnable()
        {
           public void run()
           {
               resetGame();
           }
        }, 200L);
    }

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent event)
    {
        // When a player joins, set them to zombie and update them if game is running, teleport.
        if (gameRunning)
        {
            Player p = event.getPlayer();
            p.sendMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "The game is in progress already. You have joined as a Zombie. Catch the humans!");
            //Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + p.getName() + " has joined the Zombies!");
            p.setDisplayName("[" + ChatColor.RED + "Zombie" + ChatColor.WHITE + "] " + p.getName());
            //p.setPlayerListName("[Zombie] " + p.getName());
            ItemStack reward = new ItemStack(3, 20);
            p.getInventory().addItem(reward);
            p.updateInventory();
        }
        handleTeleport(event.getPlayer(), false);
        event.setJoinMessage(null);
    }

    // Prevents leave server message being spammed
    @EventHandler
    public void onPlayerLeave(PlayerQuitEvent event)
    {
        event.setQuitMessage(null);
    }

    // Used to send debug messages if variable is set
    private void DebugMessage(String message, Player plr)
    {
        if (debug)
        {
            console.info(message);
            plr.sendMessage(message);
        }
    }

    // Make players immune to damage
    @EventHandler
    public void onEntityDamage(EntityDamageEvent event)
    {
        event.setCancelled(true);
    }

    // Prevent players getting hungry
    @EventHandler
    public void onFoodLevelChange(FoodLevelChangeEvent event)
    {
        event.setCancelled(true);
    }

    @EventHandler
    public void onBlockPlace(BlockPlaceEvent event)
    {
        // If game is in progress
        if (!resetting)
        {
            // A block has been placed - push that the location should be air (it was air before)
            blocks_changed.push(event.getBlockPlaced().getLocation());
            blocks_changed.push(0);
            blocks_changed.push((byte)0);
        }
        // When no game, no building
        else
        {
            event.setCancelled(true);
        }
    }

    @EventHandler
    public void onBlockBreak(BlockBreakEvent event)
    {
        // If game is not resetting
        if (!resetting)
        {
            // Push the block being deleted for restorating later
            Block b = event.getBlock();
            blocks_changed.push(b.getLocation());
            blocks_changed.push(b.getTypeId());
            blocks_changed.push(b.getData());
            // Does not appear to work
            b.getDrops().clear();
        }
        // when no game, no building
        else
        {
            event.setCancelled(true);
        }
    }

    public void resetGame()
    {
        try
        {
            // Reset the map by rolling back changes
            Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "Restoring arena... This may cause some lag.");

            while (!blocks_changed.isEmpty())
            {
                Byte b = (Byte)blocks_changed.pop();
                Integer mat = (Integer)blocks_changed.pop();
                Location loc = (Location)blocks_changed.pop();
                loc.getBlock().setTypeIdAndData(mat, b, true);
            }

            blocks_changed.clear();
            gameRunning = false;
            resetting = false;
            mark_zombies = false;
            incrementRound();

            Bukkit.broadcastMessage(ChatColor.RED + "[ChaoticUnited] " + ChatColor.AQUA + "Done!");
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
        }
        finally
        {
            // Make sure the needed variables change
            gameRunning = false;
            resetting = false;
            mark_zombies = false;
            incrementRound();
        }
    }

    @EventHandler
    public void ignitefire(BlockIgniteEvent event)
    {
        // Try to stop fire
        event.setCancelled(true);
    }

    public void handleTeleport(Player plr, Boolean human)
    {
        // This function teleports humans and zombies depending on the round
        // Sand Arena
        if (round == 1)
        {
            if (human)
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 437, 71, 230));
            }
            else
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 458, 84, 231));
            }
        }
        // Diamond Arena
        else if (round == 2)
        {
            if (human)
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 438, 158, 220));
            }
            else
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 438, 163, 220));
            }
        }
        // The Tiny Arena
        else if (round == 3)
        {
            if (human)
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 554, 95, 206));
            }
            else
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 554, 100, 206));
            }
        }
        // Water/Lava Arena
        else if (round == 4)
        {
            if (human)
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 554, 107, 210));
            }
            else
            {
                plr.teleport(new Location(Bukkit.getServer().getWorld("world"), 553, 108, 229));
            }
        }
    }

    public void incrementRound()
    {
        // This function sets the round
        if (round == 1)
        {
            round = 2;
        }
        else if (round == 2)
        {
            round = 3;
        }
        else if (round == 3)
        {
            round = 4;
        }
        else if (round == 4)
        {
            round = 1;
        }
    }

    @EventHandler
    public void onPlayerCrouch(PlayerToggleSneakEvent event)
    {
        // Stop crouching as it prevents name tag showing
        event.setCancelled(true);
    }

    @EventHandler
    public void onWeatherChange(WeatherChangeEvent event)
    {
        // Try to stop weather
        getServer().getWorld("world").setWeatherDuration(1);
        event.setCancelled(true);
    }
}