package net.knarcraft.factions.engine;

import net.knarcraft.factions.Factions;
import net.knarcraft.factions.TerritoryAccess;
import net.knarcraft.factions.entity.Board;
import net.knarcraft.factions.entity.BoardColl;
import net.knarcraft.factions.entity.Faction;
import net.knarcraft.factions.entity.FactionColl;
import net.knarcraft.factions.entity.MConf;
import net.knarcraft.factions.entity.MPerm;
import net.knarcraft.factions.entity.MPlayer;
import net.knarcraft.factions.util.EnumerationUtil;
import com.massivecraft.massivecore.Engine;
import com.massivecraft.massivecore.ps.PS;
import com.massivecraft.massivecore.util.MUtil;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.entity.Entity;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.entity.Projectile;
import org.bukkit.event.Cancellable;
import org.bukkit.event.Event;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.block.Action;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.block.BlockFromToEvent;
import org.bukkit.event.block.BlockPistonExtendEvent;
import org.bukkit.event.block.BlockPistonRetractEvent;
import org.bukkit.event.block.BlockPlaceEvent;
import org.bukkit.event.block.SignChangeEvent;
import org.bukkit.event.entity.EntityChangeBlockEvent;
import org.bukkit.event.entity.EntityCombustByEntityEvent;
import org.bukkit.event.entity.EntityDamageByEntityEvent;
import org.bukkit.event.hanging.HangingBreakByEntityEvent;
import org.bukkit.event.hanging.HangingPlaceEvent;
import org.bukkit.event.player.PlayerBucketEmptyEvent;
import org.bukkit.event.player.PlayerBucketFillEvent;
import org.bukkit.event.player.PlayerInteractAtEntityEvent;
import org.bukkit.event.player.PlayerInteractEntityEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.projectiles.ProjectileSource;

import java.util.List;
import java.util.Map;

public class EnginePermBuild extends Engine {
    // -------------------------------------------- //
    // INSTANCE & CONSTRUCT
    // -------------------------------------------- //

    private static EnginePermBuild i = new EnginePermBuild();

    public static EnginePermBuild get() {
        return i;
    }

    // -------------------------------------------- //
    // LOGIC > PROTECT
    // -------------------------------------------- //

    public static Boolean isProtected(ProtectCase protectCase, boolean verboose, MPlayer mplayer, PS ps, Object object) {
		if (mplayer == null) {
			return null;
		}
		if (protectCase == null) {
			return null;
		}
        String name = mplayer.getName();
		if (MConf.get().playersWhoBypassAllProtection.contains(name)) {
			return false;
		}
		if (mplayer.isOverriding()) {
			return false;
		}

        MPerm perm = protectCase.getPerm(object);
		if (perm == null) {
			return null;
		}
		if (protectCase != ProtectCase.BUILD) {
			return !perm.has(mplayer, ps, verboose);
		}

        if (!perm.has(mplayer, ps, false) && MPerm.getPermPainbuild().has(mplayer, ps, false)) {
			if (!verboose) {
				return false;
			}

            Faction hostFaction = BoardColl.get().getFactionAt(ps);
            mplayer.msg("<b>It is painful to build in the territory of %s<b>.", hostFaction.describeTo(mplayer));
            Player player = mplayer.getPlayer();
			if (player != null) {
				player.damage(MConf.get().actionDeniedPainAmount);
			}
        }

        return !perm.has(mplayer, ps, verboose);
    }

    public static Boolean protect(ProtectCase protectCase, boolean verboose, Player player, PS ps, Object object, Cancellable cancellable) {
        Boolean ret = isProtected(protectCase, verboose, MPlayer.get(player), ps, object);
		if (Boolean.TRUE.equals(ret) && cancellable != null) {
			cancellable.setCancelled(true);
		}

        return ret;
    }

    public static Boolean build(Entity entity, Block block, Event event) {
		if (!(event instanceof Cancellable)) {
			return true;
		}
		if (MUtil.isntPlayer(entity)) {
			return false;
		}
        Player player = (Player) entity;
        boolean verboose = !isFake(event);
        return protect(ProtectCase.BUILD, verboose, player, PS.valueOf(block), block, (Cancellable) event);
    }

    public static Boolean useItem(Player player, Block block, Material material, Cancellable cancellable) {
        return protect(ProtectCase.USE_ITEM, true, player, PS.valueOf(block), material, cancellable);
    }

    public static Boolean useEntity(Player player, Entity entity, boolean verboose, Cancellable cancellable) {
        return protect(ProtectCase.USE_ENTITY, verboose, player, PS.valueOf(entity), entity, cancellable);
    }

    public static Boolean useBlock(Player player, Block block, boolean verboose, Cancellable cancellable) {
        return protect(ProtectCase.USE_BLOCK, verboose, player, PS.valueOf(block), block.getType(), cancellable);
    }

    // -------------------------------------------- //
    // LOGIC > PROTECT > BUILD
    // -------------------------------------------- //

    public static boolean canPlayerBuildAt(Object senderObject, PS ps, boolean verboose) {
        MPlayer mplayer = MPlayer.get(senderObject);
		if (mplayer == null) {
			return false;
		}

        Boolean ret = isProtected(ProtectCase.BUILD, verboose, mplayer, ps, null);
        return !Boolean.TRUE.equals(ret);
    }

    // -------------------------------------------- //
    // BUILD > BLOCK
    // -------------------------------------------- //

    @EventHandler(priority = EventPriority.NORMAL)
    public void build(BlockPlaceEvent event) {
        build(event.getPlayer(), event.getBlock(), event);
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void build(BlockBreakEvent event) {
        build(event.getPlayer(), event.getBlock(), event);
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void build(SignChangeEvent event) {
        build(event.getPlayer(), event.getBlock(), event);
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void build(HangingPlaceEvent event) {
        build(event.getPlayer(), event.getBlock(), event);
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void build(HangingBreakByEntityEvent event) {
        build(event.getRemover(), event.getEntity().getLocation().getBlock(), event);
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void build(EntityChangeBlockEvent event) {
        // Handling lilypads being broken by boats
        Entity entity = event.getEntity();
		if (entity.getType() != EntityType.BOAT || entity.getPassengers().size() <= 0) {
			return;
		}
        Entity player = entity.getPassengers().stream().filter(MUtil::isPlayer).findAny().orElse(entity);

        build(player, event.getBlock(), event);
    }


    // -------------------------------------------- //
    // USE > ITEM
    // -------------------------------------------- //

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void useBlockItem(PlayerInteractEvent event) {
        // If the player right clicks (or is physical with) a block ...
		if (event.getAction() != Action.RIGHT_CLICK_BLOCK && event.getAction() != Action.PHYSICAL) {
			return;
		}

        Block block = event.getClickedBlock();
        Player player = event.getPlayer();
		if (block == null) {
			return;
		}

        // ... and we are either allowed to use this block ...
        Boolean ret = useBlock(player, block, true, event);
		if (Boolean.TRUE.equals(ret)) {
			return;
		}

        // ... or are allowed to right click with the item, this event is safe to perform.
		if (event.getAction() != Action.RIGHT_CLICK_BLOCK) {
			return;
		}
        useItem(player, block, event.getMaterial(), event);
    }

    // For some reason onPlayerInteract() sometimes misses bucket events depending on distance
    // (something like 2-3 blocks away isn't detected), but these separate bucket events below always fire without fail

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void useItem(PlayerBucketEmptyEvent event) {
        useItem(event.getPlayer(), event.getBlockClicked().getRelative(event.getBlockFace()), event.getBucket(), event);
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void useItem(PlayerBucketFillEvent event) {
        useItem(event.getPlayer(), event.getBlockClicked(), event.getBucket(), event);
    }

    // -------------------------------------------- //
    // USE > ENTITY
    // -------------------------------------------- //

    // This event will not fire for Minecraft 1.8 armor stands.
    // Armor stands are handled in EngineSpigot instead.
    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void useEntity(PlayerInteractEntityEvent event) {
        // Ignore Off Hand
		if (isOffHand(event)) {
			return;
		}
        useEntity(event.getPlayer(), event.getRightClicked(), true, event);
    }

    // This is a special Spigot event that fires for Minecraft 1.8 armor stands.
    // It also fires for other entity types but for those the event is buggy.
    // It seems we can only cancel interaction with armor stands from here.
    // Thus we only handle armor stands from here and handle everything else in EngineMain.
    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void handleArmorStand(PlayerInteractAtEntityEvent event) {
        // Ignore Off Hand
		if (isOffHand(event)) {
			return;
		}

        // Gather Info
        final Player player = event.getPlayer();
		if (MUtil.isntPlayer(player)) {
			return;
		}
        final Entity entity = event.getRightClicked();
        final boolean verboose = true;

        // Only care for armor stands.
		if (entity.getType() != EntityType.ARMOR_STAND) {
			return;
		}

        // If we can't use, block it
        EnginePermBuild.useEntity(player, entity, verboose, event);
    }

    // -------------------------------------------- //
    // BUILD > ENTITY
    // -------------------------------------------- //

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void buildEntity(EntityDamageByEntityEvent event) {
        // If a player ...
        Entity damager = MUtil.getLiableDamager(event);
		if (MUtil.isntPlayer(damager)) {
			return;
		}
        Player player = (Player) damager;

        // ... damages an entity which is edited on damage ...
        Entity entity = event.getEntity();
		if (entity == null || !EnumerationUtil.isEntityTypeEditOnDamage(entity.getType())) {
			return;
		}

        // ... and the player can't build there, cancel the event
        build(player, entity.getLocation().getBlock(), event);
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void combustEntity(EntityCombustByEntityEvent event) {

        // If a burning projectile ...
		if (!(event.getCombuster() instanceof Projectile)) {
			return;
		}
        Projectile entityProjectile = (Projectile) event.getCombuster();

        // ... fired by a player ...
        ProjectileSource projectileSource = entityProjectile.getShooter();
		if (MUtil.isntPlayer(projectileSource)) {
			return;
		}
        Player player = (Player) projectileSource;

        // ... and hits an entity which is edited on damage (and thus likely to burn) ...
        Entity entityTarget = event.getEntity();
		if (entityTarget == null || !EnumerationUtil.isEntityTypeEditOnDamage(entityTarget.getType())) {
			return;
		}

        // ... and the player can't build there, cancel the event
        Block block = entityTarget.getLocation().getBlock();
        protect(ProtectCase.BUILD, false, player, PS.valueOf(block), block, event);
    }

    // -------------------------------------------- //
    // BUILD > PISTON
    // -------------------------------------------- //

    /*
     * Note: With 1.8 and the slime blocks, retracting and extending pistons
     * became more of a problem. Blocks located on the border of a chunk
     * could have easily been stolen. That is the reason why every block
     * needs to be checked now, whether he moved into a territory which
     * he actually may not move into.
     */
    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void blockBuild(BlockPistonExtendEvent event) {
        // Is checking deactivated by MConf?
		if (!MConf.get().handlePistonProtectionThroughDenyBuild) {
			return;
		}

        Faction pistonFaction = BoardColl.get().getFactionAt(PS.valueOf(event.getBlock()));

        List<Block> blocks = event.getBlocks();

        // Check for all extended blocks
        for (Block block : blocks) {
            // Block which is being pushed into
            Block targetBlock = block.getRelative(event.getDirection());

            // Members of a faction might not have build rights in their own territory, but pistons should still work regardless
            Faction targetFaction = BoardColl.get().getFactionAt(PS.valueOf(targetBlock));
			if (targetFaction == pistonFaction) {
				continue;
			}

            // Perm check
			if (MPerm.getPermBuild().has(pistonFaction, targetFaction)) {
				continue;
			}

            event.setCancelled(true);
            return;
        }
    }

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void blockBuild(BlockPistonRetractEvent event) {
        // Is checking deactivated by MConf?
		if (!MConf.get().handlePistonProtectionThroughDenyBuild) {
			return;
		}

        Faction pistonFaction = BoardColl.get().getFactionAt(PS.valueOf(event.getBlock()));

        List<Block> blocks = event.getBlocks();

        // Check for all retracted blocks
        for (Block block : blocks) {
            // Is the retracted block air/water/lava? Don't worry about it
			if (block.isEmpty() || block.isLiquid()) {
				return;
			}

            // Members of a faction might not have build rights in their own territory, but pistons should still work regardless
            Faction targetFaction = BoardColl.get().getFactionAt(PS.valueOf(block));
			if (targetFaction == pistonFaction) {
				continue;
			}

            // Perm check
			if (MPerm.getPermBuild().has(pistonFaction, targetFaction)) {
				continue;
			}

            event.setCancelled(true);
            return;
        }
    }

    // -------------------------------------------- //
    // BUILD > FIRE
    // -------------------------------------------- //

    @SuppressWarnings("deprecation")
    @EventHandler(priority = EventPriority.NORMAL)
    public void buildFire(PlayerInteractEvent event) {
        // If it is a left click on block and the clicked block is not null...
		if (event.getAction() != Action.LEFT_CLICK_BLOCK || event.getClickedBlock() == null) {
			return;
		}

        // ... and the potential block is not null either ...
        Block potentialBlock = event.getClickedBlock().getRelative(BlockFace.UP, 1);
		if (potentialBlock == null) {
			return;
		}

        Material blockType = potentialBlock.getType();

        // ... and we're only going to check for fire ... (checking everything else would be bad performance wise)
		if (blockType != Material.FIRE) {
			return;
		}

        // ... check if they can't build, cancel the event ...
		if (!Boolean.FALSE.equals(build(event.getPlayer(), potentialBlock, event))) {
			return;
		}

        // ... and compensate for client side prediction
        event.getPlayer().sendBlockChange(potentialBlock.getLocation(), blockType, potentialBlock.getState().getRawData());
    }

    // -------------------------------------------- //
    // BUILD > MOVE
    // -------------------------------------------- //

    @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
    public void buildMove(BlockFromToEvent event) {
		if (!MConf.get().protectionLiquidFlowEnabled) {
			return;
		}

        // Prepare fields
        Block fromBlock = event.getBlock();
        int chunkFromX = fromBlock.getX() >> 4;
        int chunkFromZ = fromBlock.getZ() >> 4;
        BlockFace face = event.getFace();
        int chunkToX = (fromBlock.getX() + face.getModX()) >> 4;
        int chunkToZ = (fromBlock.getZ() + face.getModZ()) >> 4;

        // If a liquid (or dragon egg) moves from one chunk to another ...
		if (chunkToX == chunkFromX && chunkToZ == chunkFromZ) {
			return;
		}

        // ... get the correct board for this block ...
        Board board = BoardColl.get().getFixed(fromBlock.getWorld().getName().toLowerCase(), false);
		if (board == null) {
			return;
		}

        // ... get the access map ...
        Map<PS, TerritoryAccess> map = board.getMapRaw();
		if (map.isEmpty()) {
			return;
		}

        // ... get the faction ids from and to ...
        PS fromPs = PS.valueOf(chunkFromX, chunkFromZ);
        PS toPs = PS.valueOf(chunkToX, chunkToZ);
        TerritoryAccess fromTa = map.get(fromPs);
        TerritoryAccess toTa = map.get(toPs);

        // Null checks are needed here since automatic board cleaning can be undesired sometimes
        String fromId = fromTa != null ? fromTa.getHostFactionId() : Factions.ID_NONE;
        String toId = toTa != null ? toTa.getHostFactionId() : Factions.ID_NONE;

        // ... and the chunks belong to different factions ...
		if (toId.equals(fromId)) {
			return;
		}

        // ... and the faction "from" can not build at "to" ...
        Faction fromFac = FactionColl.get().getFixed(fromId);
		if (fromFac == null) {
			fromFac = FactionColl.get().getNone();
		}
        Faction toFac = FactionColl.get().getFixed(toId);
		if (toFac == null) {
			toFac = FactionColl.get().getNone();
		}
		if (MPerm.getPermBuild().has(fromFac, toFac)) {
			return;
		}

        // ... cancel the event!
        event.setCancelled(true);
    }

}