package world.bentobox.level.commands;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
import java.util.UUID;
import java.util.stream.Collectors;

import org.bukkit.World;

import world.bentobox.bentobox.api.commands.CompositeCommand;
import world.bentobox.bentobox.api.localization.TextVariables;
import world.bentobox.bentobox.api.user.User;
import world.bentobox.level.Level;
import world.bentobox.level.objects.TopTenData;

public class AdminStatsCommand extends CompositeCommand {

	private final Level level;

	public AdminStatsCommand(Level addon, CompositeCommand parent) {
		super(parent, "stats");
		this.level = addon;
		new AdminTopRemoveCommand(addon, this);
	}

	@Override
	public void setup() {
		this.setPermission("admin.stats");
		this.setOnlyPlayer(false);
		this.setDescription("admin.stats.description");
	}

	@Override
	public boolean execute(User user, String label, List<String> args) {
		user.sendMessage("admin.stats.title");
		for (Entry<World, TopTenData> en : level.getManager().getTopTenLists().entrySet()) {
			user.sendMessage("admin.stats.world", TextVariables.NAME,
					level.getPlugin().getIWM().getWorldName(en.getKey()));
			Map<UUID, Long> topTen = en.getValue().getTopTen();
			if (topTen.isEmpty()) {
				user.sendMessage("admin.stats.no-data");
				return false;
			}

			// Calculating basic statistics
			long sum = 0, max = Long.MIN_VALUE, min = Long.MAX_VALUE;
			Map<Long, Integer> levelFrequency = new HashMap<>();

			for (Long level : topTen.values()) {
				sum += level;
				max = Math.max(max, level);
				min = Math.min(min, level);
				levelFrequency.merge(level, 1, Integer::sum);
			}

			double average = sum / (double) topTen.size();
			List<Long> sortedLevels = topTen.values().stream().sorted().collect(Collectors.toList());
			long median = sortedLevels.get(sortedLevels.size() / 2);
			Long mode = Collections.max(levelFrequency.entrySet(), Map.Entry.comparingByValue()).getKey();

			// Logging basic statistics
			user.sendMessage("admin.stats.average-level", TextVariables.NUMBER, String.valueOf(average));
			user.sendMessage("admin.stats.median-level", TextVariables.NUMBER, String.valueOf(median));
			user.sendMessage("admin.stats.mode-level", TextVariables.NUMBER, String.valueOf(mode));
			user.sendMessage("admin.stats.highest-level", TextVariables.NUMBER, String.valueOf(max));
			user.sendMessage("admin.stats.lowest-level", TextVariables.NUMBER, String.valueOf(min));

			// Grouping data for distribution analysis
			Map<String, Integer> rangeMap = new TreeMap<>();
			for (Long level : topTen.values()) {
				String range = getRange(level);
				rangeMap.merge(range, 1, Integer::sum);
			}

			// Logging distribution
			user.sendMessage("admin.stats.distribution");
			for (Map.Entry<String, Integer> entry : rangeMap.entrySet()) {
				user.sendMessage(
						entry.getKey() + ": " + entry.getValue() + " " + user.getTranslation("admin.stats.islands"));
			}
		}
		return true;
	}

	private static String getRange(long level) {
		long rangeStart = level / 100 * 100;
		long rangeEnd = rangeStart + 99;
		return rangeStart + "-" + rangeEnd;
	}
}