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/*
 * PlotSquared, a land and world management plugin for Minecraft.
 * Copyright (C) IntellectualSites 
 * Copyright (C) IntellectualSites team and contributors
 *
 * 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 com.plotsquared.core.command;

import com.google.inject.Inject;
import com.plotsquared.core.configuration.Settings;
import com.plotsquared.core.configuration.caption.TranslatableCaption;
import com.plotsquared.core.database.DBFunc;
import com.plotsquared.core.events.PlotRateEvent;
import com.plotsquared.core.events.TeleportCause;
import com.plotsquared.core.permissions.Permission;
import com.plotsquared.core.player.PlotPlayer;
import com.plotsquared.core.plot.Plot;
import com.plotsquared.core.plot.Rating;
import com.plotsquared.core.plot.flag.implementations.DoneFlag;
import com.plotsquared.core.util.EventDispatcher;
import com.plotsquared.core.util.TabCompletions;
import com.plotsquared.core.util.query.PlotQuery;
import com.plotsquared.core.util.task.TaskManager;
import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.minimessage.tag.Tag;
import net.kyori.adventure.text.minimessage.tag.resolver.TagResolver;
import org.checkerframework.checker.nullness.qual.NonNull;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
import java.util.stream.Collectors;

@CommandDeclaration(command = "like",
        permission = "plots.like",
        usage = "/plot like [next | purge]",
        category = CommandCategory.INFO,
        requiredType = RequiredType.PLAYER)
public class Like extends SubCommand {

    private final EventDispatcher eventDispatcher;

    @Inject
    public Like(final @NonNull EventDispatcher eventDispatcher) {
        this.eventDispatcher = eventDispatcher;
    }

    /**
     * Get the likes to dislike ratio of a plot as a percentage (in decimal form)
     *
     * @param plot plot
     * @return likes to dislike ratio, returns zero if the plot has no likes
     */
    public static double getLikesPercentage(final Plot plot) {
        if (!plot.hasRatings()) {
            return 0;
        }
        final Collection reactions = plot.getLikes().values();
        double numLikes = 0, numDislikes = 0;
        for (final boolean reaction : reactions) {
            if (reaction) {
                numLikes += 1;
            } else {
                numDislikes += 1;
            }
        }
        if (numLikes == 0 && numDislikes == 0) {
            return 0D;
        } else if (numDislikes == 0) {
            return 1.0D;
        }
        return numLikes / (numLikes + numDislikes);
    }

    protected boolean handleLike(
            final PlotPlayer player, String[] args,
            final boolean like
    ) {
        final UUID uuid = player.getUUID();
        if (args.length == 1) {
            switch (args[0].toLowerCase()) {
                case "next" -> {
                    final List plots = PlotQuery.newQuery().whereBasePlot().asList();
                    plots.sort((p1, p2) -> {
                        double v1 = getLikesPercentage(p1);
                        double v2 = getLikesPercentage(p2);
                        if (v1 == v2) {
                            return -0;
                        }
                        return v2 > v1 ? 1 : -1;
                    });
                    for (final Plot plot : plots) {
                        if ((!Settings.Done.REQUIRED_FOR_RATINGS || DoneFlag.isDone(plot)) && plot
                                .isBasePlot() && !plot.getLikes().containsKey(uuid)) {
                            plot.teleportPlayer(player, TeleportCause.COMMAND_LIKE, result -> {
                            });
                            player.sendMessage(TranslatableCaption.of("tutorial.rate_this"));
                            return true;
                        }
                    }
                    player.sendMessage(TranslatableCaption.of("invalid.found_no_plots"));
                    return true;
                }
                case "purge" -> {
                    final Plot plot = player.getCurrentPlot();
                    if (plot == null) {
                        player.sendMessage(TranslatableCaption.of("errors.not_in_plot"));
                        return false;
                    }
                    if (!player.hasPermission(Permission.PERMISSION_ADMIN_COMMAND_PURGE_RATINGS, true)) {
                        return false;
                    }
                    plot.clearRatings();
                    player.sendMessage(TranslatableCaption.of("ratings.ratings_purged"));
                    return true;
                }
            }
        }
        final Plot plot = player.getCurrentPlot();
        if (plot == null) {
            player.sendMessage(TranslatableCaption.of("errors.not_in_plot"));
            return false;
        }
        if (!plot.hasOwner()) {
            player.sendMessage(TranslatableCaption.of("ratings.rating_not_owned"));
            return false;
        }
        if (plot.isOwner(player.getUUID())) {
            player.sendMessage(TranslatableCaption.of("ratings.rating_not_your_own"));
            return false;
        }
        if (Settings.Done.REQUIRED_FOR_RATINGS && !DoneFlag.isDone(plot)) {
            player.sendMessage(TranslatableCaption.of("ratings.rating_not_done"));
            return false;
        }
        final Runnable run = () -> {
            final Boolean oldRating = plot.getLikes().get(uuid);
            if (oldRating != null) {
                player.sendMessage(
                        TranslatableCaption.of("ratings.rating_already_exists"),
                        TagResolver.resolver("plot", Tag.inserting(Component.text(plot.getId().toString())))
                );
                return;
            }
            final int rating;
            if (like) {
                rating = 10;
            } else {
                rating = 1;
            }
            plot.addRating(uuid, new Rating(rating));
            final PlotRateEvent event =
                    this.eventDispatcher.callRating(player, plot, new Rating(rating));
            if (event.getRating() != null) {
                plot.addRating(uuid, event.getRating());
                if (like) {
                    player.sendMessage(
                            TranslatableCaption.of("ratings.rating_liked"),
                            TagResolver.resolver("plot", Tag.inserting(Component.text(plot.getId().toString())))
                    );
                } else {
                    player.sendMessage(
                            TranslatableCaption.of("ratings.rating_disliked"),
                            TagResolver.resolver("plot", Tag.inserting(Component.text(plot.getId().toString())))
                    );
                }
            }
        };
        if (plot.getSettings().getRatings() == null) {
            if (!Settings.Enabled_Components.RATING_CACHE) {
                TaskManager.runTaskAsync(() -> {
                    plot.getSettings().setRatings(DBFunc.getRatings(plot));
                    run.run();
                });
                return true;
            }
            plot.getSettings().setRatings(new HashMap<>());
        }
        run.run();
        return true;
    }

    @Override
    public boolean onCommand(PlotPlayer player, String[] args) {
        return handleLike(player, args, true);
    }

    @Override
    public Collection tab(final PlotPlayer player, final String[] args, final boolean space) {
        if (args.length == 1) {
            final List completions = new LinkedList<>();
            if (player.hasPermission(Permission.PERMISSION_ADMIN_COMMAND_PURGE_RATINGS)) {
                completions.add("purge");
            }
            final List commands = completions.stream().filter(completion -> completion
                            .toLowerCase()
                            .startsWith(args[0].toLowerCase()))
                    .map(completion -> new Command(null, true, completion, "", RequiredType.PLAYER, CommandCategory.INFO) {
                    }).collect(Collectors.toCollection(LinkedList::new));
            if (player.hasPermission(Permission.PERMISSION_RATE) && args[0].length() > 0) {
                commands.addAll(TabCompletions.completePlayers(player, args[0], Collections.emptyList()));
            }
            return commands;
        }
        return TabCompletions.completePlayers(player, String.join(",", args).trim(), Collections.emptyList());
    }

}




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