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package asofold.fix.wgp;

import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import org.bukkit.Location;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.event.Event;
import org.bukkit.event.Event.Priority;
import org.bukkit.event.block.BlockListener;
import org.bukkit.event.block.BlockPistonExtendEvent;
import org.bukkit.event.block.BlockPistonRetractEvent;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

import com.sk89q.worldguard.bukkit.WorldGuardPlugin;
import com.sk89q.worldguard.domains.DefaultDomain;
import com.sk89q.worldguard.protection.ApplicableRegionSet;
import com.sk89q.worldguard.protection.managers.RegionManager;
import com.sk89q.worldguard.protection.regions.ProtectedRegion;

public class WGPFix extends JavaPlugin {
    class WGPFixBlockListener extends BlockListener {
        private WGPFix plugin;
        long tsWG = 0;
        long tsThreshold = 4000;
        WorldGuardPlugin wg = null;
        
        public boolean monitorPistons = true;
        
        public  WGPFixBlockListener(WGPFix plg) {
            this.plugin = plg;
            
        }

        @Override
        public void onBlockPistonExtend(BlockPistonExtendEvent event) {
            if ( !monitorPistons) return;
            if ( event.isCancelled()) return;
            Block pistonBlock = event.getBlock();
            List<Block> affectedBlocks = event.getBlocks();

            List<Location> locs = new LinkedList<Location>();
            BlockFace dir = event.getDirection();
            locs.add(pistonBlock.getRelative(dir).getLocation());
            int bSize = affectedBlocks.size();
            if ( (affectedBlocks!=null) && (bSize>0) ){
                for ( Block block : affectedBlocks){
                    locs.add(block.getLocation());
                }
                // add empty block at end
                Block endBlock = pistonBlock.getRelative(dir,bSize+1 );
                locs.add(endBlock.getLocation());
            }
            if ( !sameOwners(pistonBlock.getLocation(), locs)){
                event.setCancelled(true);
            }    
        }

        @Override
        public void onBlockPistonRetract(BlockPistonRetractEvent event) {
            if ( !monitorPistons) return;
            if ( event.isCancelled()) return;
            if (event.isSticky()){
                Block pistonBlock = event.getBlock();
                Location affecteLoc = event.getRetractLocation();
                List<Location> affected = new LinkedList<Location>();
                affected.add(affecteLoc);
                affected.add(pistonBlock.getRelative(event.getDirection()).getLocation());
                if ( !sameOwners(pistonBlock.getLocation(), affected)) event.setCancelled(true);    
            }
            
        }
        
        private void setWG() {
            Plugin temp = plugin.getServer().getPluginManager().getPlugin("WorldGuard");
            WorldGuardPlugin wg = (WorldGuardPlugin) temp;
            this.wg = wg;
            this.tsWG = System.currentTimeMillis();
            // TODO: maybe get region managers already here
        }
        
        public boolean sameOwners(Location refLoc, List<Location> locs){
            if (System.currentTimeMillis()-this.tsWG > this.tsThreshold) this.setWG();
            RegionManager mg = this.wg.getRegionManager(refLoc.getWorld());
            ApplicableRegionSet set = mg.getApplicableRegions(refLoc);
            boolean isRegion = set.size() != 0;
            // TODO: use some caching ?
            Set<String> mustMatch = getUserSet(set);
            int size = mustMatch.size();
            for ( Location loc : locs){
                set = mg.getApplicableRegions(loc);
                int sz = set.size();
                if ( (set==null) || (sz==0)){
                    // ok.
                } else if ( isRegion ){
                    // compare owner sets:
                    Set<String> ref = getUserSet(set);
                    if ( size != ref.size() ) return false;
                    if ( !mustMatch.containsAll(ref)) return false;
                } else {
                    // disallow from no region to unowned region !
                    return false; 
                }
            }
            
            return true;
        }
        public Set<String> getUserSet(ApplicableRegionSet rs){
            Set<String> set = new HashSet<String>();
            if ( rs != null ){
                for ( ProtectedRegion region : rs){
                    DefaultDomain dom = region.getOwners();
                    for ( String p : dom.getPlayers()){
                        set.add(p.toLowerCase());
                    }
                    for ( String p : dom.getGroups()){
                        set.add("g:"+p.toLowerCase());
                    }
                    dom = region.getMembers();
                    for ( String p : dom.getPlayers()){
                        set.add(p.toLowerCase());
                    }
                    for ( String p : dom.getGroups()){
                        set.add("g:"+p.toLowerCase());
                    }
                }
            }
            
            return set;
        }
    }
    
    private final WGPFixBlockListener blockListener = new WGPFixBlockListener(this);
    
    
    @Override
    public void onDisable() {
        System.out.println("WorldGuardPistonFix (WGPFix) 1.0.0 disabled.");
    }

    @Override
    public void onEnable() {
        PluginManager pm = getServer().getPluginManager();
        pm.registerEvent(Event.Type.BLOCK_PISTON_EXTEND, this.blockListener, Priority.Low, this);
        pm.registerEvent(Event.Type.BLOCK_PISTON_RETRACT, this.blockListener, Priority.Low, this);
        System.out.println("WorldGuardPistonFix (WGPFix) 1.0.0 enabled.");
    }

}