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/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package dev.espi.protectionstones;

import com.sk89q.worldedit.math.BlockVector2;
import com.sk89q.worldguard.protection.managers.RegionManager;
import com.sk89q.worldguard.protection.regions.ProtectedRegion;
import dev.espi.protectionstones.utils.BlockUtil;
import dev.espi.protectionstones.utils.WGUtils;
import net.milkbowl.vault.economy.EconomyResponse;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.entity.Player;

import javax.annotation.Nullable;
import java.util.*;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Represents an instance of a ProtectionStones protected region.
 */

public abstract class PSRegion {
    RegionManager rgmanager;
    World world;

    PSRegion(RegionManager rgmanager, World world) {
        this.rgmanager = checkNotNull(rgmanager);
        this.world = checkNotNull(world);
    }

    // ~~~~~~~~~~~~~~~~~ static ~~~~~~~~~~~~~~~~~

    /**
     * Get the protection stone region that the location is in, or the closest one if there are overlapping regions.
     * Returns either {@link PSGroupRegion}, {@link PSStandardRegion} or {@link PSMergedRegion}.
     *
     * @param l the location
     * @return the {@link PSRegion} object if the location is in a region, or null if the location is not in a region
     */
    public static PSRegion fromLocation(Location l) {
        PSRegion r = fromLocationUnsafe(l);
        return r == null || r.getTypeOptions() == null ? null : r;
    }

    /**
     * Get the protection stone region that the location is in, or the closest one if there are overlapping regions.
     * May return a region with an unconfigured block type (getTypeOptions returns null).
     * Returns either {@link PSGroupRegion}, {@link PSStandardRegion} or {@link PSMergedRegion}.
     *
     * @param l the location
     * @return the {@link PSRegion} object if the location is in a region, or null if the location is not in a region
     */
    public static PSRegion fromLocationUnsafe(Location l) {
        checkNotNull(checkNotNull(l).getWorld());
        RegionManager rgm = WGUtils.getRegionManagerWithWorld(l.getWorld());
        if (rgm == null) return null;

        // check exact location first for merged region block
        PSMergedRegion pr = PSMergedRegion.getMergedRegion(l);
        if (pr != null) return pr;

        return fromLocationGroupUnsafe(l);
    }

    /**
     * Get the protection stone parent region that the location is in.
     * Returns either {@link PSGroupRegion} or {@link PSStandardRegion}.
     *
     * @param l the location
     * @return the {@link PSRegion} object if the location is in a region, or null if the location is not in a region
     */
    public static PSRegion fromLocationGroup(Location l) {
        PSRegion r = fromLocationGroupUnsafe(l);
        return r == null || r.getTypeOptions() == null ? null : r;
    }

    /**
     * Get the protection stone parent region that the location is in.
     * May return a region with an unconfigured block type (getTypeOptions returns null).
     * Returns either {@link PSGroupRegion} or {@link PSStandardRegion}.
     *
     * @param l the location
     * @return the {@link PSRegion} object if the location is in a region, or null if the location is not in a region
     */
    public static PSRegion fromLocationGroupUnsafe(Location l) {
        checkNotNull(checkNotNull(l).getWorld());
        RegionManager rgm = WGUtils.getRegionManagerWithWorld(l.getWorld());
        if (rgm == null) return null;

        // check if location is in a region
        String psID = WGUtils.matchLocationToPSID(l);
        ProtectedRegion r = rgm.getRegion(psID);

        if (r == null) {
            return null;
        } else if (r.getFlag(FlagHandler.PS_MERGED_REGIONS) != null) {
            return new PSGroupRegion(r, rgm, l.getWorld());
        } else {
            return new PSStandardRegion(r, rgm, l.getWorld());
        }
    }

    /**
     * Get the protection stone region with the world and region.
     * It returns a WGRegion with a null type if the block type isn't configured in the config.
     *
     * @param w the world
     * @param r the WorldGuard region
     * @return the {@link PSRegion} based on the parameters, or null if the region given is not a protectionstones region
     */
    public static PSRegion fromWGRegion(World w, ProtectedRegion r) {
        if (!ProtectionStones.isPSRegionFormat(r)) return null;
        if (r.getFlag(FlagHandler.PS_MERGED_REGIONS) != null) {
            return new PSGroupRegion(r, WGUtils.getRegionManagerWithWorld(checkNotNull(w)), w);
        } else {
            return new PSStandardRegion(r, WGUtils.getRegionManagerWithWorld(checkNotNull(w)), w);
        }
    }

    /**
     * Get the protection stones regions that have the given name as their set nickname (/ps name)
     *
     * @param w    the world to look for regions in
     * @param name the nickname of the region
     * @return the list of regions that have that name
     */

    public static List fromName(World w, String name) {
        RegionManager rgm = WGUtils.getRegionManagerWithWorld(w);
        if (rgm == null) return new ArrayList<>();

        List l = new ArrayList<>();

        List rIds = ProtectionStones.regionNameToID.get(w.getUID()).get(name);
        if (rIds == null) return l;

        for (int i = 0; i < rIds.size(); i++) {
            String id = rIds.get(i);
            if (rgm.getRegion(id) == null) { // cleanup cache
                rIds.remove(i);
                i--;
            } else {
                l.add(fromWGRegion(w, rgm.getRegion(id)));
            }
        }
        return l;
    }

    /**
     * Get the protection stones regions that have the given name as their set nickname (/ps name), from all worlds.
     *
     * @param name the nickname of the regions
     * @return the map of worlds, to the regions that have the name
     */

    public static HashMap> fromName(String name) {
        HashMap> regions = new HashMap<>();
        for (UUID worldUid : ProtectionStones.regionNameToID.keySet()) {
            World w = Bukkit.getWorld(worldUid);
            regions.put(w, fromName(w, name));
        }
        return regions;
    }

    // ~~~~~~~~~~~ instance ~~~~~~~~~~~~~~~~

    /**
     * @return gets the world that the region is in
     */
    public World getWorld() {
        return world;
    }

    @Deprecated
    public String getID() {
        return getId();
    }

    /**
     * Get the WorldGuard ID of the region. Note that this is not guaranteed to be unique between worlds.
     * @return the id of the region
     */
    public abstract String getId();

    /**
     * Get the name (nickname) of the region from /ps name.
     * @return the name of the region, or null if the region does not have a name
     */

    public abstract String getName();

    /**
     * Set the name of the region (from /ps name).
     * @param name new name, or null to remove the name
     */

    public abstract void setName(String name);

    /**
     * Set the parent of this region.
     * @param r the region to be the parent, or null for no parent
     * @throws ProtectedRegion.CircularInheritanceException thrown when the parent already inherits from the child
     */

    public abstract void setParent(PSRegion r) throws ProtectedRegion.CircularInheritanceException;

    /**
     * Get the parent of this region, if there is one.
     * @return the parent of the region, or null if there isn't one
     */

    public abstract PSRegion getParent();

    /**
     * Get the location of the set home the region has (for /ps tp).
     * @return the location of the home, or null if the ps_home flag is not set.
     */
    public abstract Location getHome();

    /**
     * Set the home of the region (internally changes the flag).
     * @param blockX block x location
     * @param blockY block y location
     * @param blockZ block z location
     */
    public abstract void setHome(double blockX, double blockY, double blockZ);

    /**
     * Set the home of the region (internally changes the flag).
     * @param blockX block x location
     * @param blockY block y location
     * @param blockZ block z location
     * @param yaw location yaw
     * @param pitch location pitch
     */
    public abstract void setHome(double blockX, double blockY, double blockZ, float yaw, float pitch);

    // -=-=-=-=- Selling, Buying, Renting -=-=-=-=-

    public enum RentStage {
        NOT_RENTING, LOOKING_FOR_TENANT, RENTING
    }

    /**
     * @return whether or not the region is for sale
     */
    public abstract boolean forSale();

    /**
     * MUST BE CALLED when setting up the region to be sold or cancelling sale
     *
     * @param forSale  whether or not the region is for sale
     * @param landlord the owner of the region
     * @param price    the price to sell for
     */
    public abstract void setSellable(boolean forSale, UUID landlord, double price);

    /**
     * Sells the region to a player at the price listed.
     * @param player player to transfer the region to
     */
    public abstract void sell(UUID player);

    /**
     * @return get the stage of the renting process
     */
    public abstract RentStage getRentStage();

    /**
     * Get the landlord of the region.
     * @return returns the UUID of the landlord, or null if there is none.
     */
    public abstract UUID getLandlord();

    /**
     * Set the landlord of the region.
     * @param landlord uuid of landlord, or null to remove
     */
    public abstract void setLandlord(UUID landlord);

    /**
     * Get the tenant of the region.
     * @return returns the UUID of the tenant, or null if there is none.
     */
    public abstract UUID getTenant();

    /**
     * Set the tenant of the region
     * @param tenant uuid of tenant, or null to remove
     */
    public abstract void setTenant(UUID tenant);

    /**
     * Get the rent period of the region
     * @return returns the rent duration, or null if there is none
     */
    public abstract String getRentPeriod();

    /**
     * Set the rent period of the region
     * @param s the duration between rent payments (d h m s), or null to remove
     */
    public abstract void setRentPeriod(String s);

    /**
     * Get the price of the region
     * This applies to either the rent or the full purchase of a region.
     *
     * @return the price of the region during rent payments, or null if there is no rent
     */
    public abstract Double getPrice();

    /**
     * Set the price of the region.
     * This applies to either the rent or the full purchase of a region.
     *
     * @param price the price of the region, or null if there is no rent
     */
    public abstract void setPrice(Double price);

    /**
     * Set the unix timestamp of when rent was last paid.
     * @param timestamp the unix timestamp of when rent was last paid, or null
     */
    public abstract void setRentLastPaid(Long timestamp);

    /**
     * Get the unix timestamp of when rent was last paid.
     * @return the unix timestamp of when rent was last paid, or null if not renting
     */
    public abstract Long getRentLastPaid();

    /**
     * MUST BE CALLED when the region is looking for a tenant.
     *
     * @param landlord   the landlord of the region
     * @param rentPeriod the rent period (d h m s) of the region
     * @param rentPrice  the price to charge during each rent payment
     */
    public abstract void setRentable(UUID landlord, String rentPeriod, double rentPrice);

    /**
     * Starts renting process (adds to rent queue) tenant.
     * MUST BE CALLED when renting the region out to a tenant.
     *
     * @param landlord   the landlord of the region
     * @param tenant     the tenant of the region
     * @param rentPeriod the rent period (d h m s) of the region
     * @param rentPrice  the price to charge during each rent payment
     */
    public abstract void rentOut(UUID landlord, UUID tenant, String rentPeriod, double rentPrice);

    /**
     * Stop renting process and remove tenant.
     * MUST BE CALLED when removing rent.
     */
    public abstract void removeRenting();

    // -=-=-=-=- Taxes -=-=-=-=-

    public static class TaxPayment implements Comparable {
        long whenPaymentIsDue;
        double amount;
        String regionId; // the region that caused the payment (especially applicable for group regions); also used since hashsets don't have duplicates

        public TaxPayment(long whenPaymentIsDue, double amount, String regionId) {
            this.whenPaymentIsDue = whenPaymentIsDue;
            this.amount = amount;
            this.regionId = regionId;
        }

        /**
         * Convert a flag entry to a tax payment object. The flag entry is in the form "timestamp amount regionId".
         * @param s the flag value
         * @return the tax payment object, or null if the string was invalid
         */
        public static TaxPayment fromString(String s) {
            String[] arr = s.split(" ");
            if (arr.length < 3) return null;
            try {
                return new TaxPayment(Long.parseLong(arr[0]), Double.parseDouble(arr[1]), arr[2]);
            } catch (NumberFormatException e) {
                return null;
            }
        }

        /**
         * Converts the tax payment object into its flag representation.
         * @return the flag representation of this object
         */
        public String toFlagEntry() {
            return whenPaymentIsDue + " " + amount + " " + regionId;
        }

        @Override
        public int compareTo(TaxPayment t) {
            return Long.compare(whenPaymentIsDue, t.whenPaymentIsDue);
        }

        public long getWhenPaymentIsDue() {
            return this.whenPaymentIsDue;
        }

        public double getAmount() {
            return this.amount;
        }

        public String getRegionId() {
            return this.regionId;
        }

        public void setWhenPaymentIsDue(long whenPaymentIsDue) {
            this.whenPaymentIsDue = whenPaymentIsDue;
        }

        public void setAmount(double amount) {
            this.amount = amount;
        }

        public void setRegionId(String regionId) {
            this.regionId = regionId;
        }
    }

    public static class LastRegionTaxPaymentEntry {
        String regionId;
        long lastPaymentAdded;

        public LastRegionTaxPaymentEntry(String regionId, long lastPaymentAdded) {
            this.regionId = regionId;
            this.lastPaymentAdded = lastPaymentAdded;
        }

        /**
         * Convert a flag entry to a last region tax payment entry object. The flag entry is in the form "regionId timestamp".
         * @param s the flag value
         * @return the last region tax payment entry object, or null if the string was invalid
         */
        public static LastRegionTaxPaymentEntry fromString(String s) {
            String[] arr = s.split(" ");
            if (arr.length < 2) return null;
            try {
                return new LastRegionTaxPaymentEntry(arr[0], Long.parseLong(arr[1]));
            } catch (NumberFormatException e) {
                return null;
            }
        }

        /**
         * Converts the last region tax payment entry object into its flag representation.
         * @return the flag representation of this object
         */
        public String toFlagEntry() {
            return regionId + " " + lastPaymentAdded;
        }

        public String getRegionId() {
            return this.regionId;
        }

        public long getLastPaymentAdded() {
            return this.lastPaymentAdded;
        }

        public void setRegionId(String regionId) {
            this.regionId = regionId;
        }

        public void setLastPaymentAdded(long lastPaymentAdded) {
            this.lastPaymentAdded = lastPaymentAdded;
        }
    }

    /**
     * Get the tax rate for this region type.
     * @return the tax rate
     */
    public double getTaxRate() {
        return getTypeOptions().taxAmount;
    }

    /**
     * Get the formatted period(s) between tax payments for this region type.
     * If you simply wanted the number of seconds, use getTypeOptions().taxPeriod
     * @return the duration between tax payments, or multiple if there are several different ones
     */
    public abstract String getTaxPeriod();

    /**
     * Get the formatted period(s) allowed for the payment of tax.
     * If you simply wanted the number of seconds, use getTypeOptions().taxPaymentTime
     * @return the duration of time allowed to pay a tax, or multiple if there are several different ones
     */
    public abstract String getTaxPaymentPeriod();

    /**
     * Get the list of tax payments that are due.
     * @return the list of tax payments outstanding
     */
    public abstract List getTaxPaymentsDue();

    /**
     * Save the list of tax payments due onto the region.
     * @param taxPayments the full list of tax payments that are due
     */
    public abstract void setTaxPaymentsDue(List taxPayments);

    /**
     * Get the list of timestamps of the last time regions and sub regions have added to the tax payments list.
     * @return the list of the last time regions and sub regions have added to the tax payment list
     */
    public abstract List getRegionLastTaxPaymentAddedEntries();

    /**
     * Save the list of timestamps of the last time regions and sub regions have added to the tax payments list on to the base region.
     * @param entries the full list of {@link LastRegionTaxPaymentEntry} entries.
     */
    public abstract void setRegionLastTaxPaymentAddedEntries(List entries);

    /**
     * Get the player that is set to autopay the tax amount.
     * @return the player that is set as the autopayer, or null if no player is set
     */
    public abstract UUID getTaxAutopayer();

    /**
     * Set a player to auto-pay taxes for this region.
     * @param player the player to use to auto-pay taxes
     */
    public abstract void setTaxAutopayer(UUID player);

    /**
     * Pay outstanding taxes.
     * It will only withdraw the amount required to pay the taxes, and will take up to the amount
     * specified if the outstanding payments are larger.
     *
     * @param p the player to take money from
     * @param amount the amount to take
     * @return the {@link EconomyResponse} returned by Vault
     */
    public abstract EconomyResponse payTax(PSPlayer p, double amount);

    /**
     * Check if any tax payments are now late (exceeded tax payment time shown in config).
     * @return whether or not any tax payments are now late
     */
    public abstract boolean isTaxPaymentLate();

    /**
     * Update with the current time and calculate any tax payments that are now due.
     */
    public abstract void updateTaxPayments();

    // -=-=-=-=- Other -=-=-=-=-=-

    /**
     * Must be run sync (calls Bukkit API)
     * @return whether or not the protection block is hidden (/ps hide)
     */
    public boolean isHidden() {
        return !this.getType().equals(BlockUtil.getProtectBlockType(this.getProtectBlock()));
    }

    /**
     * Hides the protection block, if it is not hidden.
     * @return whether or not the block was hidden
     */
    public boolean hide() {
        if (!isHidden()) {
            getProtectBlock().setType(Material.AIR);
            return true;
        } else {
            return false;
        }
    }

    /**
     * Unhides the protection block, if it is hidden.
     * @return whether or not the block was unhidden
     */
    public boolean unhide() {
        if (isHidden()) {
            if (getType().startsWith("PLAYER_HEAD")) {
                getProtectBlock().setType(Material.PLAYER_HEAD);
                if (getType().split(":").length > 1) {
                    BlockUtil.setHeadType(getType(), getProtectBlock());
                }
            } else {
                getProtectBlock().setType(Material.getMaterial(getType()));
            }
            return true;
        } else {
            return false;
        }
    }

    /**
     * Toggle whether or not the protection block is hidden.
     */
    public void toggleHide() {
        if (!hide()) unhide();
    }

    /**
     * This method returns the block that is supposed to contain the protection block.
     * Warning: If the protection stone is hidden, this will give the block that took its place!
     *
     * @return returns the block that may contain the protection stone
     */
    public abstract Block getProtectBlock();

    /**
     * @return returns the type, or null if the type is not configured
     */
    @Nullable
    public abstract PSProtectBlock getTypeOptions();

    /**
     * @return returns the protect block type (may include custom player heads PLAYER_HEAD:playername) that the region is
     */
    public abstract String getType();

    /**
     * Change the type of the protection region.
     * @param type the type of protection region to switch to
     */
    public void setType(PSProtectBlock type) {
        if (!isHidden()) {
            Material set = Material.matchMaterial(type.type) == null ? Material.PLAYER_HEAD : Material.matchMaterial(type.type);
            getProtectBlock().setType(set);
            if (type.type.startsWith("PLAYER_HEAD") && type.type.split(":").length > 1) {
                BlockUtil.setHeadType(type.type, getProtectBlock());
            }
        }
    }

    /**
     * Get whether or not a player is an owner of this region.
     * @param uuid the player's uuid
     * @return whether or not the player is a member
     */

    public abstract boolean isOwner(UUID uuid);

    /**
     * Get whether or not a player is a member of this region.
     * @param uuid the player's uuid
     * @return whether or not the player is a member
     */

    public abstract boolean isMember(UUID uuid);

    /**
     * @return returns a list of the owners of the protected region
     */
    public abstract ArrayList getOwners();

    /**
     * @return returns a list of the members of the protected region
     */
    public abstract ArrayList getMembers();

    /**
     * Add an owner to the region.
     * @param uuid the uuid of the player to add
     */
    public abstract void addOwner(UUID uuid);

    /**
     * Add a member to the region.
     * @param uuid the uuid of the player to add
     */
    public abstract void addMember(UUID uuid);

    /**
     * Remove an owner of the region, and deal with side-effects.
     * Examples of side-effects: removing player as landlord, removing player as auto taxpayer
     * @param uuid the uuid of the player to remove
     */
    public abstract void removeOwner(UUID uuid);

    /**
     * Remove a member of the region, and deal with side-effects
     * @param uuid the uuid of the player to remove
     */
    public abstract void removeMember(UUID uuid);

    /**
     * @return returns a list of the bounding points of the protected region
     */
    public abstract List getPoints();

    /**
     * Get a list of regions that the current region can merge into, taking into account a player's permissions.
     *
     * @param p the player to compare permissions with
     * @return the list of regions that the current region can merge into
     */
    public abstract List getMergeableRegions(Player p);

    /**
     * Deletes the region forever. Can be cancelled by event cancellation.
     *
     * @param deleteBlock whether or not to also set the protection block to air (if not hidden)
     * @return whether or not the region was able to be successfully removed
     */
    public abstract boolean deleteRegion(boolean deleteBlock);

    /**
     * Deletes the region forever. Can be cancelled by event cancellation.
     *
     * @param deleteBlock whether or not to also set the protection block to air (if not hidden)
     * @param cause       the player that caused the region to break
     * @return whether or not the region was able to be successfully removed
     */
    public abstract boolean deleteRegion(boolean deleteBlock, Player cause);

    /**
     * @return returns the WorldGuard region object directly
     */
    public abstract ProtectedRegion getWGRegion();

    /**
     * @return returns the WorldGuard region manager that stores this region
     */
    public RegionManager getWGRegionManager() {
        return rgmanager;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        PSRegion psRegion = (PSRegion) o;
        return Objects.equals(getId(), psRegion.getId()) && Objects.equals(getWorld(), psRegion.getWorld());
    }

    @Override
    public int hashCode() {
        return Objects.hash(getId(), getWorld());
    }
}




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