package com.example.essentialsplus.ui;

import com.example.essentialsplus.EssentialsPlusPlugin;
import com.example.essentialsplus.skills.SkillGoals;
import com.example.essentialsplus.skills.SkillHistory;
import com.example.essentialsplus.skills.SkillStore;
import com.example.essentialsplus.skills.XpSample;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.EnumMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import net.runelite.api.Experience;
import net.runelite.api.Skill;
import net.runelite.client.ui.DynamicGridLayout;
import net.runelite.client.ui.FontManager;
import net.runelite.client.ui.PluginPanel;
import net.runelite.client.util.ImageUtil;

/** Skills tab: xp gained per skill over the global time range, with charts and level-up history. */
public class SkillsPanel extends PluginPanel
{
	private static final int LEVEL_UP_LIMIT = 15;
	private static final DateTimeFormatter WHEN = DateTimeFormatter.ofPattern("d MMM HH:mm", Locale.ENGLISH);

	private final EssentialsPlusPlugin plugin;
	private final SkillStore store;
	private final TimeFilter timeFilter;
	private final Runnable rangeListener = this::refreshLater;
	private final Timer coalesce;
	private final Timer ticker;
	private final Map<Skill, BufferedImage> icons = new EnumMap<>(Skill.class);

	private final SkillsCard card = new SkillsCard(null);
	private final JComboBox<Choice> characterBox = new JComboBox<>();
	private final JLabel chartTitle = new JLabel();
	private final JLabel showAll = new JLabel("Show all");
	private final XpChart cumulative = new XpChart(XpChart.Mode.CUMULATIVE, 150);
	private final XpChart perPeriod = new XpChart(XpChart.Mode.BARS, 100);
	private final StatsView stats = new StatsView(2);
	private final JPanel skillList = new JPanel(new DynamicGridLayout(0, 1, 0, 2));
	private final JPanel levelList = new JPanel(new DynamicGridLayout(0, 1, 0, 2));
	private final JLabel levelEmpty = new JLabel();
	private final JCheckBox hudBox = new JCheckBox("Show xp HUD in-game");
	private final SkillRow[] rows = new SkillRow[SkillHistory.SKILLS.length];
	private final List<Integer> rowOrder = new ArrayList<>();

	private String selectedKey;
	/** character whose skills are shown (goals belong to it) */
	private String shownKey;
	private int selectedSkill = -1;
	private boolean updatingCombo;

	public SkillsPanel(EssentialsPlusPlugin plugin, Runnable onBack)
	{
		super(true);
		this.plugin = plugin;
		this.store = plugin.getSkillStore();
		this.timeFilter = plugin.getTimeFilter();

		setBackground(Ui.BG);
		setLayout(new DynamicGridLayout(0, 1, 0, 6));

		JPanel backRow = new JPanel(new BorderLayout(6, 0));
		backRow.setOpaque(false);
		backRow.setBorder(BorderFactory.createEmptyBorder(0, 0, 4, 0));
		JButton backBtn = button("← Overview", onBack);
		backBtn.setForeground(Ui.ACCENT);
		backRow.add(backBtn, BorderLayout.WEST);
		JLabel titleLabel = new JLabel("Skills");
		titleLabel.setFont(FontManager.getRunescapeBoldFont());
		titleLabel.setForeground(Ui.ACCENT);
		titleLabel.setHorizontalAlignment(JLabel.RIGHT);
		backRow.add(titleLabel, BorderLayout.CENTER);
		add(backRow);

		characterBox.setFont(FontManager.getRunescapeSmallFont());
		characterBox.setBackground(Ui.CARD);
		characterBox.setFocusable(false);
		characterBox.addActionListener(e ->
		{
			Choice c = (Choice) characterBox.getSelectedItem();
			if (!updatingCombo && c != null)
			{
				selectedKey = c.key;
				refresh();
			}
		});
		characterBox.setVisible(false);
		add(characterBox);

		card.addMouseListener(new MouseAdapter()
		{
			@Override
			public void mousePressed(MouseEvent e)
			{
				maybePopup(e);
			}

			@Override
			public void mouseReleased(MouseEvent e)
			{
				maybePopup(e);
			}

			private void maybePopup(MouseEvent e)
			{
				if (e.isPopupTrigger() || SwingUtilities.isRightMouseButton(e))
				{
					JPopupMenu menu = new JPopupMenu();
					JMenuItem reset = new JMenuItem("Reset Hourly");
					reset.addActionListener(ev ->
					{
						plugin.resetSkillsHourly(shownKey);
						refreshLater();
					});
					menu.add(reset);
					menu.show(card, e.getX(), e.getY());
				}
			}
		});
		add(card);

		hudBox.setFont(FontManager.getRunescapeSmallFont());
		hudBox.setForeground(Ui.TEXT);
		hudBox.setOpaque(false);
		hudBox.setFocusPainted(false);
		hudBox.setToolTipText("In-game overlay with the xp gained per skill in the selected time range");
		hudBox.setSelected(plugin.isSkillsHudEnabled());
		hudBox.addActionListener(e -> plugin.setSkillsHudEnabled(hudBox.isSelected()));
		JButton[] hudOptions = new JButton[1];
		hudOptions[0] = button("Options", () -> showHudOptions(hudOptions[0]));
		hudOptions[0].setToolTipText("Choose what the in-game xp HUD shows");
		JPanel hudRow = new JPanel(new BorderLayout(6, 0));
		hudRow.setOpaque(false);
		hudRow.add(hudBox, BorderLayout.CENTER);
		hudRow.add(hudOptions[0], BorderLayout.EAST);
		add(hudRow);

		showAll.setFont(FontManager.getRunescapeSmallFont());
		showAll.setForeground(Ui.ACCENT);
		showAll.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
		showAll.addMouseListener(new MouseAdapter()
		{
			@Override
			public void mousePressed(MouseEvent e)
			{
				selectSkill(-1);
			}
		});
		JPanel chartHeader = new JPanel(new BorderLayout(6, 0));
		chartHeader.setOpaque(false);
		chartHeader.setBorder(BorderFactory.createEmptyBorder(6, 2, 0, 2));
		JLabel xpLabel = new JLabel("XP GAINED");
		xpLabel.setFont(FontManager.getRunescapeSmallFont());
		xpLabel.setForeground(Ui.MUTED);
		chartHeader.add(xpLabel, BorderLayout.WEST);
		chartTitle.setFont(FontManager.getRunescapeSmallFont());
		chartTitle.setForeground(Ui.TEXT);
		chartTitle.setHorizontalAlignment(JLabel.RIGHT);
		chartHeader.add(chartTitle, BorderLayout.CENTER);
		chartHeader.add(showAll, BorderLayout.EAST);
		add(chartHeader);
		add(cumulative);
		add(stats);
		add(WealthPanel.sectionHeader("XP PER PERIOD", null, null, null));
		add(perPeriod);

		add(WealthPanel.sectionHeader("SKILLS  (click to chart, cog for a goal)", null, null, null));
		skillList.setOpaque(false);
		for (int i = 0; i < rows.length; i++)
		{
			rows[i] = new SkillRow(i);
		}
		add(skillList);

		add(WealthPanel.sectionHeader("LEVEL UPS", null, null, null));
		levelList.setOpaque(false);
		levelEmpty.setFont(FontManager.getRunescapeSmallFont());
		levelEmpty.setForeground(Ui.FAINT);
		levelEmpty.setHorizontalAlignment(JLabel.CENTER);
		add(levelList);

		coalesce = new Timer(1000, e -> refresh());
		coalesce.setRepeats(false);
		ticker = new Timer(30_000, e -> refresh());
		ticker.start();
		timeFilter.addListener(rangeListener);
		refresh();
	}

	public void dispose()
	{
		ticker.stop();
		coalesce.stop();
		timeFilter.removeListener(rangeListener);
	}

	/** Coalesces bursts of xp drops into one repaint per second. */
	public void refreshLater()
	{
		if (!coalesce.isRunning())
		{
			coalesce.start();
		}
	}

	private void selectSkill(int skill)
	{
		selectedSkill = selectedSkill == skill ? -1 : skill;
		refresh();
	}

	/** Resolves which character to show: explicit choice, else the logged-in one, else the latest. */
	static SkillHistory resolve(SkillStore store, String preferred, String active)
	{
		SkillHistory h = store.get(preferred);
		if (h == null || h.latest() == null)
		{
			h = store.get(active);
		}
		if (h == null || h.latest() == null)
		{
			List<SkillHistory> all = store.all();
			h = all.isEmpty() ? null : all.get(0);
		}
		return h;
	}

	/** Fills a summary card (used by the overview too). */
	static void fillCard(SkillsCard card, SkillHistory h, TimeFilter filter, String title)
	{
		if (h == null)
		{
			card.update(title, "", false, 0, 0, filter.getLabel(), "", new long[0], new long[0]);
			return;
		}
		long start = h.start(filter);
		long rateStart = h.rateStart(filter);
		long[] gained = h.gained(filter);
		long total = 0;
		for (long g : gained)
		{
			total += g;
		}
		int levels = 0;
		for (SkillHistory.LevelUp lu : h.levelUps(start))
		{
			levels += gained[lu.skill] > 0 ? lu.to - lu.from : 0;
		}
		long rateGained = h.gainedTotalSince(rateStart);
		long active = h.activeMillis(rateStart, -1);
		String xph = active >= Ui.MINUTE && rateGained > 0 ? Ui.gp(rateGained * Ui.HOUR / active) + " xp/h" : "";

		List<XpSample> samples = h.range(start);
		long[] t = new long[samples.size() + 1];
		long[] v = new long[samples.size() + 1];
		long base = samples.isEmpty() ? 0 : samples.get(0).total();
		for (int i = 0; i < samples.size(); i++)
		{
			t[i] = Math.max(samples.get(i).t, start);
			v[i] = samples.get(i).total() - base;
		}
		if (samples.isEmpty())
		{
			t = new long[0];
			v = new long[0];
		}
		else
		{
			t[samples.size()] = System.currentTimeMillis();
			v[samples.size()] = v[samples.size() - 1];
		}
		card.update(title, h.name == null ? "" : h.name, true, total, levels, filter.getLabel(), xph, t, v);
		XpSample latest = h.latest();
		int totalLevel = 0;
		if (latest != null)
		{
			for (int s = 0; s < SkillHistory.SKILLS.length; s++)
			{
				totalLevel += SkillHistory.level(latest.get(s));
			}
		}
		card.setTotals(latest == null ? 0 : latest.total(), totalLevel);
		card.setSkillGains(gained);
	}

	private void refresh()
	{
		long now = System.currentTimeMillis();
		String active = plugin.getSkillKey();
		SkillHistory h = resolve(store, selectedKey, active);
		updateCombo(h);
		hudBox.setSelected(plugin.isSkillsHudEnabled());

		shownKey = h == null ? null : h.key;
		fillCard(card, h, timeFilter, "Skills");
		String label = timeFilter.getLabel();
		if (h == null)
		{
			chartTitle.setText("");
			showAll.setVisible(false);
			cumulative.setData(null, null, -1, now - Ui.HOUR, now, Ui.GOLD, "Log in to start tracking xp");
			perPeriod.setData(null, null, -1, now - Ui.HOUR, now, Ui.GOLD, "No data yet");
			stats.update(new ArrayList<>());
			skillList.removeAll();
			rowOrder.clear();
			levelList.removeAll();
			revalidate();
			repaint();
			return;
		}

		long start = h.start(timeFilter);
		long[] starts = h.starts(timeFilter);
		long rateStart = h.rateStart(timeFilter);
		long[] rateStarts = h.rateStarts(timeFilter);
		List<XpSample> samples = h.range(start);
		long chartStart = samples.isEmpty() ? now - Ui.HOUR : Math.max(start, samples.get(0).t);
		if (timeFilter.getRange() != null && !timeFilter.getRange().isAll())
		{
			chartStart = start;
		}
		long[] gained = h.gained(timeFilter);
		List<SkillHistory.LevelUp> levelUps = h.levelUps(start);
		levelUps.removeIf(lu -> gained[lu.skill] <= 0);
		XpSample last = h.latest();

		// ---- chart + stats for the selection
		int sel = selectedSkill;
		Color color = sel < 0 ? Ui.GOLD : skillColor(SkillHistory.SKILLS[sel]);
		chartTitle.setText(sel < 0 ? "All skills" : SkillHistory.SKILLS[sel].getName());
		chartTitle.setForeground(sel < 0 ? Ui.TEXT : color);
		showAll.setVisible(sel >= 0);
		String empty = "No xp gained " + timeFilter.inLabel();
		cumulative.setData(samples, levelUps, sel, chartStart, now, color, empty);
		perPeriod.setData(samples, levelUps, sel, chartStart, now, color, empty);

		long total = 0;
		int trained = 0;
		for (long g : gained)
		{
			total += g;
			trained += g > 0 ? 1 : 0;
		}
		long selGained = sel < 0 ? total : gained[sel];
		long rateSelStart = sel < 0 ? rateStart : rateStarts[sel];
		long selRateGained = sel < 0 ? h.gainedTotalSince(rateStart) : h.gainedSince(rateStarts[sel], sel);
		long activeMs = h.activeMillis(rateSelStart, sel);
		int levels = 0;
		for (SkillHistory.LevelUp lu : levelUps)
		{
			if (sel < 0 || lu.skill == sel)
			{
				levels += lu.to - lu.from;
			}
		}
		List<StatsView.Cell> cells = new ArrayList<>();
		cells.add(new StatsView.Cell("XP gained", "+" + Ui.gp(selGained), label, selGained > 0 ? Ui.UP : Ui.FAINT,
			String.format(Locale.US, "%,d xp", selGained)));
		cells.add(new StatsView.Cell("XP / hour", activeMs >= Ui.MINUTE && selRateGained > 0 ? Ui.gp(selRateGained * Ui.HOUR / activeMs) : "-",
			"while training", Ui.TEXT, "Xp per hour of active training time"));
		cells.add(new StatsView.Cell("Levels", "+" + levels, null, levels > 0 ? Ui.UP : Ui.TEXT, "Levels gained in " + label));
		cells.add(new StatsView.Cell("Active", duration(activeMs), null, Ui.TEXT, "Time spent gaining xp (gaps under 5 minutes)"));
		if (sel < 0)
		{
			int totalLevel = 0;
			for (int i = 0; i < SkillHistory.SKILLS.length; i++)
			{
				totalLevel += Math.min(99, SkillHistory.level(last.get(i)));
			}
			cells.add(new StatsView.Cell("Skills trained", String.valueOf(trained), null, Ui.TEXT, null));
			cells.add(new StatsView.Cell("Total level", String.valueOf(totalLevel), null, Ui.GOLD, null));
		}
		else
		{
			int xp = last.get(sel);
			int lvl = SkillHistory.level(xp);
			String toNext = lvl >= Experience.MAX_VIRT_LEVEL ? "-" : Ui.gp(Experience.getXpForLevel(lvl + 1) - xp);
			cells.add(new StatsView.Cell("Level", String.valueOf(lvl), Ui.gp(xp) + " xp", color, String.format(Locale.US, "%,d xp", xp)));
			cells.add(new StatsView.Cell("To level " + Math.min(lvl + 1, Experience.MAX_VIRT_LEVEL), toNext, null, Ui.TEXT, null));
			SkillGoals.Goal goal = goal(sel);
			if (goal != null)
			{
				int left = goal.xpLeft(xp);
				long selXph = activeMs >= Ui.MINUTE && selGained > 0 ? selGained * Ui.HOUR / activeMs : 0;
				cells.add(new StatsView.Cell("Goal " + goal.level, percent(goal.progress(xp)), left == 0 ? "reached" : Ui.gp(left) + " xp left",
					left == 0 ? Ui.UP : Ui.GOLD, String.format(Locale.US, "%,d / %,d xp", xp, goal.targetXp())));
				cells.add(new StatsView.Cell("Time to goal", left == 0 ? "-" : selXph > 0 ? duration(left * Ui.HOUR / selXph) : "-",
					selXph > 0 ? "at " + Ui.gp(selXph) + "/h" : "no xp/h yet", Ui.TEXT, null));
			}
		}
		stats.update(cells);

		// ---- skill rows (trained skills by xp, then the rest in game order)
		List<Integer> order = new ArrayList<>();
		for (int i = 0; i < gained.length; i++)
		{
			order.add(i);
		}
		order.sort((a, b) -> Long.compare(gained[b], gained[a]));
		long maxGain = gained.length == 0 ? 0 : gained[order.get(0)];
		for (int i = 0; i < rows.length; i++)
		{
			int xp = last.get(i);
			int from = gained[i] > 0 ? SkillHistory.level(h.at(starts[i]).get(i)) : SkillHistory.level(xp);
			long skillRateStart = rateStarts[i];
			long skillRateGained = h.gainedSince(skillRateStart, i);
			long skillActive = skillRateGained > 0 ? h.activeMillis(skillRateStart, i) : 0;
			long xph = skillActive >= Ui.MINUTE ? skillRateGained * Ui.HOUR / skillActive : 0;
			rows[i].update(xp, SkillHistory.level(xp) - from, gained[i], xph, maxGain, i == sel, goal(i));
		}
		if (!order.equals(rowOrder))
		{
			rowOrder.clear();
			rowOrder.addAll(order);
			skillList.removeAll();
			for (int i : order)
			{
				skillList.add(rows[i]);
			}
			skillList.revalidate();
		}

		// ---- level ups, newest first
		levelList.removeAll();
		if (levelUps.isEmpty())
		{
			levelEmpty.setText("No level ups " + timeFilter.inLabel());
			levelList.add(levelEmpty);
		}
		for (int i = levelUps.size() - 1; i >= Math.max(0, levelUps.size() - LEVEL_UP_LIMIT); i--)
		{
			levelList.add(new LevelUpRow(levelUps.get(i)));
		}
		levelList.revalidate();

		revalidate();
		repaint();
	}

	private SkillGoals.Goal goal(int skill)
	{
		return plugin.getSkillGoals().get(shownKey, SkillHistory.SKILLS[skill].getName());
	}

	private static String percent(double ratio)
	{
		double p = ratio * 100;
		return (p >= 100 ? "100" : String.format(Locale.US, "%.1f", p)) + "%";
	}

	/** Goal editor for one skill: target level with quick picks, set and clear. */
	private void showGoalEditor(int skill, JComponent anchor, int x, int y)
	{
		if (shownKey == null)
		{
			return;
		}
		Skill s = SkillHistory.SKILLS[skill];
		SkillHistory h = store.get(shownKey);
		XpSample last = h == null ? null : h.latest();
		int xp = last == null ? 0 : last.get(skill);
		int level = SkillHistory.level(xp);
		SkillGoals.Goal current = goal(skill);
		int max = Experience.MAX_VIRT_LEVEL;
		int initial = current != null ? current.level : level < 99 ? nextMilestone(level) : level + 1;

		JPopupMenu menu = new JPopupMenu();
		JPanel panel = new JPanel(new DynamicGridLayout(0, 1, 0, 6));
		panel.setBackground(Ui.CARD);
		panel.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));

		JLabel title = new JLabel(s.getName() + " goal");
		title.setFont(FontManager.getRunescapeBoldFont());
		title.setForeground(skillColor(s));
		panel.add(title);
		JLabel now = new JLabel(String.format(Locale.US, "Now level %d  (%,d xp)", level, xp));
		now.setFont(FontManager.getRunescapeSmallFont());
		now.setForeground(Ui.MUTED);
		panel.add(now);

		SpinnerNumberModel model = new SpinnerNumberModel(Math.max(2, Math.min(max, initial)), 2, max, 1);
		JSpinner spinner = new JSpinner(model);
		spinner.setFont(FontManager.getRunescapeFont());
		JLabel preview = new JLabel();
		preview.setFont(FontManager.getRunescapeSmallFont());
		preview.setForeground(Ui.TEXT);
		Runnable updatePreview = () ->
		{
			int target = Experience.getXpForLevel((Integer) model.getValue());
			int left = Math.max(0, target - xp);
			preview.setText(left == 0 ? "Already reached" : String.format(Locale.US, "%,d xp needed", left));
		};
		spinner.addChangeListener(e -> updatePreview.run());
		updatePreview.run();
		JPanel levelRow = new JPanel(new BorderLayout(6, 0));
		levelRow.setOpaque(false);
		JLabel lvLabel = new JLabel("Target level");
		lvLabel.setFont(FontManager.getRunescapeSmallFont());
		lvLabel.setForeground(Ui.TEXT);
		levelRow.add(lvLabel, BorderLayout.WEST);
		levelRow.add(spinner, BorderLayout.CENTER);
		panel.add(levelRow);

		JPanel quick = new JPanel(new java.awt.GridLayout(1, 4, 3, 0));
		quick.setOpaque(false);
		for (int[] pick : new int[][]{{1, 0}, {5, 0}, {0, 70}, {0, 99}})
		{
			String label = pick[0] > 0 ? "+" + pick[0] : String.valueOf(pick[1]);
			quick.add(button(label, () -> model.setValue(Math.max(2, Math.min(max, pick[0] > 0 ? level + pick[0] : pick[1])))));
		}
		panel.add(quick);
		panel.add(preview);

		JPanel actions = new JPanel(new java.awt.GridLayout(1, 2, 6, 0));
		actions.setOpaque(false);
		JButton set = button("Set goal", () ->
		{
			plugin.getSkillGoals().set(shownKey, s.getName(), (Integer) model.getValue(), xp);
			menu.setVisible(false);
			refresh();
		});
		set.setForeground(Ui.ACCENT);
		actions.add(set);
		JButton clear = button("Clear", () ->
		{
			plugin.getSkillGoals().clear(shownKey, s.getName());
			menu.setVisible(false);
			refresh();
		});
		clear.setEnabled(current != null);
		actions.add(clear);
		panel.add(actions);

		panel.setPreferredSize(new Dimension(190, panel.getPreferredSize().height));
		menu.add(panel);
		menu.show(anchor, Math.max(0, Math.min(x, anchor.getWidth() - 190)), y);
	}

	/** Next round level worth aiming for: 10, 20 .. 80, 85, 90, 99. */
	private static int nextMilestone(int level)
	{
		for (int m : new int[]{10, 20, 30, 40, 50, 60, 70, 80, 85, 90, 99})
		{
			if (m > level)
			{
				return m;
			}
		}
		return level + 1;
	}

	private void updateCombo(SkillHistory shown)
	{
		List<SkillHistory> all = store.all();
		List<Choice> choices = new ArrayList<>();
		for (SkillHistory h : all)
		{
			choices.add(new Choice(h.key, h.name == null ? h.key : h.name));
		}
		List<Choice> current = new ArrayList<>();
		for (int i = 0; i < characterBox.getItemCount(); i++)
		{
			current.add(characterBox.getItemAt(i));
		}
		updatingCombo = true;
		if (!choices.equals(current))
		{
			characterBox.removeAllItems();
			choices.forEach(characterBox::addItem);
		}
		for (Choice c : choices)
		{
			if (shown != null && c.key.equals(shown.key))
			{
				characterBox.setSelectedItem(c);
			}
		}
		updatingCombo = false;
		boolean visible = choices.size() > 1;
		if (characterBox.isVisible() != visible)
		{
			characterBox.setVisible(visible);
			revalidate();
		}
	}

	private BufferedImage icon(Skill skill)
	{
		return icons.computeIfAbsent(skill, s ->
		{
			BufferedImage img = plugin.getSkillIconManager().getSkillImage(s, true);
			return img == null ? null : ImageUtil.resizeImage(img, 16, 16);
		});
	}

	private static String duration(long ms)
	{
		if (ms < Ui.MINUTE)
		{
			return "-";
		}
		long h = ms / Ui.HOUR;
		long m = (ms % Ui.HOUR) / Ui.MINUTE;
		return h > 0 ? h + "h " + m + "m" : m + "m";
	}

	static Color skillColor(Skill skill)
	{
		switch (skill.name())
		{
			case "ATTACK": return new Color(220, 80, 60);
			case "DEFENCE": return new Color(120, 150, 230);
			case "STRENGTH": return new Color(60, 190, 120);
			case "HITPOINTS": return new Color(230, 90, 90);
			case "RANGED": return new Color(150, 200, 60);
			case "PRAYER": return new Color(235, 225, 170);
			case "MAGIC": return new Color(110, 140, 255);
			case "COOKING": return new Color(180, 100, 210);
			case "WOODCUTTING": return new Color(110, 180, 80);
			case "FLETCHING": return new Color(40, 190, 170);
			case "FISHING": return new Color(130, 170, 220);
			case "FIREMAKING": return new Color(250, 150, 40);
			case "CRAFTING": return new Color(200, 150, 100);
			case "SMITHING": return new Color(170, 170, 140);
			case "MINING": return new Color(120, 180, 210);
			case "HERBLORE": return new Color(60, 200, 70);
			case "AGILITY": return new Color(110, 115, 220);
			case "THIEVING": return new Color(190, 110, 170);
			case "SLAYER": return new Color(200, 70, 70);
			case "FARMING": return new Color(130, 200, 90);
			case "RUNECRAFT": return new Color(230, 200, 70);
			case "HUNTER": return new Color(170, 160, 110);
			case "CONSTRUCTION": return new Color(200, 180, 140);
			case "SAILING": return new Color(70, 170, 230);
			default: return Ui.GOLD;
		}
	}

	private static JButton button(String text, Runnable action)
	{
		JButton b = new JButton(text);
		b.setFont(FontManager.getRunescapeSmallFont());
		b.setFocusPainted(false);
		b.setMargin(new java.awt.Insets(2, 2, 2, 2));
		b.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
		b.addActionListener(e -> action.run());
		return b;
	}

	private static final class Choice
	{
		final String key;
		final String name;

		Choice(String key, String name)
		{
			this.key = key;
			this.name = name;
		}

		@Override
		public boolean equals(Object o)
		{
			return o instanceof Choice && ((Choice) o).key.equals(key) && Objects.equals(((Choice) o).name, name);
		}

		@Override
		public int hashCode()
		{
			return key.hashCode();
		}

		@Override
		public String toString()
		{
			return name;
		}
	}

	/** width of the goal cog hit area at the right of a skill row */
	private static final int GEAR_HIT = 20;

	/** One skill: icon, level (+gained), xp gained, xp/h, progress to the next level and the goal, if set. */
	private final class SkillRow extends JComponent
	{
		private final int skill;
		private int xp;
		private int levelsGained;
		private long gained;
		private long xph;
		private long maxGain;
		private boolean selected;
		private SkillGoals.Goal goal;
		private boolean hover;
		private boolean gearHover;

		SkillRow(int skill)
		{
			this.skill = skill;
			setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
			MouseAdapter mouse = new MouseAdapter()
			{
				@Override
				public void mouseEntered(MouseEvent e)
				{
					hover = true;
					repaint();
				}

				@Override
				public void mouseExited(MouseEvent e)
				{
					hover = false;
					gearHover = false;
					repaint();
				}

				@Override
				public void mouseMoved(MouseEvent e)
				{
					boolean g = onGear(e.getX(), e.getY());
					if (g != gearHover)
					{
						gearHover = g;
						setToolTipText(g ? "Set a level goal" : tooltip());
						repaint();
					}
				}

				@Override
				public void mousePressed(MouseEvent e)
				{
					if (SwingUtilities.isRightMouseButton(e) || onGear(e.getX(), e.getY()))
					{
						showGoalEditor(skill, SkillRow.this, e.getX(), e.getY());
					}
					else
					{
						selectSkill(skill);
					}
				}
			};
			addMouseListener(mouse);
			addMouseMotionListener(mouse);
		}

		private boolean onGear(int x, int y)
		{
			return x >= getWidth() - GEAR_HIT && y <= 20;
		}

		private String tooltip()
		{
			String t = String.format(Locale.US, "<html><b>%s</b><br>%,d xp<br>+%,d xp gained", SkillHistory.SKILLS[skill].getName(), xp, gained);
			if (goal != null)
			{
				t += String.format(Locale.US, "<br>Goal %d: %,d xp left", goal.level, goal.xpLeft(xp));
			}
			return t + "<br><i>Right-click or the cog to set a goal</i></html>";
		}

		void update(int xp, int levelsGained, long gained, long xph, long maxGain, boolean selected, SkillGoals.Goal goal)
		{
			boolean resize = (goal == null) != (this.goal == null);
			this.goal = goal;
			this.xp = xp;
			this.levelsGained = levelsGained;
			this.gained = gained;
			this.xph = xph;
			this.maxGain = maxGain;
			this.selected = selected;
			setToolTipText(tooltip());
			if (resize)
			{
				revalidate();
			}
			repaint();
		}

		@Override
		public Dimension getPreferredSize()
		{
			if (goal == null)
			{
				return new Dimension(10, 34);
			}
			int asc = getFontMetrics(FontManager.getRunescapeSmallFont()).getAscent();
			// goal text baseline at 20 + 3 * asc, then gap, 4px bar, bottom padding
			return new Dimension(10, 4 + 3 * asc + 16 + 14);
		}

		@Override
		protected void paintComponent(Graphics g0)
		{
			Graphics2D g = Ui.prepare(g0);
			int w = getWidth();
			int h = getHeight();
			Skill s = SkillHistory.SKILLS[skill];
			Color color = skillColor(s);
			boolean trained = gained > 0;

			g.setColor(selected ? Ui.CARD_SELECTED : hover ? Ui.CARD_HOVER : Ui.CARD);
			g.fillRoundRect(0, 0, w, h, 6, 6);
			if (selected)
			{
				g.setColor(color);
				g.fillRoundRect(0, 0, 3, h, 3, 3);
			}
			// share of the top skill's gain as a faint background bar
			if (trained && maxGain > 0)
			{
				g.setColor(Ui.alpha(color, 26));
				g.fillRoundRect(0, 0, (int) (w * (double) gained / maxGain), h, 6, 6);
			}

			BufferedImage img = icon(s);
			if (img != null)
			{
				g.drawImage(img, 6, (h - 16) / 2 - 2, null);
			}

			int level = SkillHistory.level(xp);
			g.setFont(FontManager.getRunescapeSmallFont());
			FontMetrics fm = g.getFontMetrics();
			int x = 28;
			int base1 = 4 + fm.getAscent();
			int base2 = base1 + fm.getAscent() + 2;
			g.setColor(trained ? Ui.TEXT : Ui.MUTED);
			g.drawString(s.getName(), x, base1);
			String lv = "Lv " + level;
			g.setColor(Ui.MUTED);
			g.drawString(lv, x, base2);
			if (levelsGained > 0)
			{
				g.setColor(Ui.UP);
				g.drawString(" +" + levelsGained, x + fm.stringWidth(lv), base2);
			}

			paintGear(g, w - 11, 10, gearHover ? Ui.ACCENT : goal != null ? Ui.GOLD : hover ? Ui.MUTED : Ui.FAINT);
			int right = w - GEAR_HIT - 2;
			g.setColor(trained ? Ui.UP : Ui.FAINT);
			Ui.drawRight(g, trained ? "+" + Ui.gp(gained) + " xp" : "-", right, base1);
			if (xph > 0)
			{
				g.setColor(Ui.MUTED);
				Ui.drawRight(g, Ui.gp(xph) + "/h", right, base2);
			}

			// progress to next level
			int levelBarY = goal == null ? h - 4 : base2 + 6;
			if (level < Experience.MAX_VIRT_LEVEL)
			{
				int lo = Experience.getXpForLevel(level);
				int hi = Experience.getXpForLevel(level + 1);
				double p = hi > lo ? (double) (xp - lo) / (hi - lo) : 0;
				int bx = x;
				int bw = w - x - 7;
				g.setColor(Ui.alpha(Color.WHITE, 18));
				g.fillRect(bx, levelBarY, bw, 2);
				g.setColor(Ui.alpha(color, trained ? 220 : 110));
				g.fillRect(bx, levelBarY, (int) (bw * Math.max(0, Math.min(1, p))), 2);
			}

			if (goal != null)
			{
				int left = goal.xpLeft(xp);
				boolean reached = left == 0;
				int base3 = levelBarY + 2 + 6 + fm.getAscent();
				String head = "Goal " + goal.level + "  ";
				g.setColor(Ui.MUTED);
				g.drawString(head, x, base3);
				g.setColor(reached ? Ui.UP : Ui.GOLD);
				g.drawString(percent(goal.progress(xp)), x + fm.stringWidth(head), base3);
				String info = reached ? "reached!" : Ui.gp(left) + " xp left" + (xph > 0 ? "  ~" + duration(left * Ui.HOUR / xph) : "");
				g.setColor(reached ? Ui.UP : Ui.TEXT);
				Ui.drawRight(g, info, w - 7, base3);
				int bx = x;
				int bw = w - x - 7;
				int by = base3 + 5;
				g.setColor(Ui.alpha(Color.WHITE, 18));
				g.fillRoundRect(bx, by, bw, 4, 4, 4);
				g.setColor(reached ? Ui.UP : Ui.GOLD);
				g.fillRoundRect(bx, by, Math.max(4, (int) (bw * goal.progress(xp))), 4, 4, 4);
			}
			g.dispose();
		}

		/** Small cog: ring with eight teeth. */
		private void paintGear(Graphics2D g, int cx, int cy, Color c)
		{
			Graphics2D g2 = (Graphics2D) g.create();
			g2.translate(cx, cy);
			g2.setColor(c);
			for (int i = 0; i < 8; i++)
			{
				g2.fillRect(-1, -6, 3, 3);
				g2.rotate(Math.PI / 4);
			}
			g2.fillOval(-4, -4, 9, 9);
			g2.setColor(selected ? Ui.CARD_SELECTED : hover ? Ui.CARD_HOVER : Ui.CARD);
			g2.fillOval(-1, -1, 3, 3);
			g2.dispose();
		}
	}

	/** "Attack 70 → 71" with the time it happened. */
	private final class LevelUpRow extends JComponent
	{
		private final SkillHistory.LevelUp levelUp;

		LevelUpRow(SkillHistory.LevelUp levelUp)
		{
			this.levelUp = levelUp;
			setToolTipText(Instant.ofEpochMilli(levelUp.t).atZone(ZoneId.systemDefault()).format(WHEN));
		}

		@Override
		public Dimension getPreferredSize()
		{
			return new Dimension(10, 22);
		}

		@Override
		protected void paintComponent(Graphics g0)
		{
			Graphics2D g = Ui.prepare(g0);
			int w = getWidth();
			int h = getHeight();
			Skill s = SkillHistory.SKILLS[levelUp.skill];
			g.setColor(Ui.CARD);
			g.fillRoundRect(0, 0, w, h, 6, 6);
			BufferedImage img = icon(s);
			if (img != null)
			{
				g.drawImage(img, 5, (h - 16) / 2, null);
			}
			g.setFont(FontManager.getRunescapeSmallFont());
			FontMetrics fm = g.getFontMetrics();
			int base = (h + fm.getAscent()) / 2 - 1;
			g.setColor(Ui.TEXT);
			String name = s.getName() + " ";
			g.drawString(name, 26, base);
			g.setColor(skillColor(s));
			String lv = levelUp.to - levelUp.from > 1 ? levelUp.from + " > " + levelUp.to : String.valueOf(levelUp.to);
			g.drawString(lv, 26 + fm.stringWidth(name), base);
			g.setColor(Ui.MUTED);
			String when = Ui.ago(levelUp.t);
			if (System.currentTimeMillis() - levelUp.t >= Ui.DAY)
			{
				when = Instant.ofEpochMilli(levelUp.t).atZone(ZoneId.systemDefault()).format(WHEN);
			}
			Ui.drawRight(g, when, w - 7, base);
			g.dispose();
		}
	}

	private static final String[][] HUD_OPTIONS = {
		{"skillsHudLevel", "Level"},
		{"skillsHudPercent", "Progress %"},
		{"skillsHudXpLeft", "Xp to level"},
		{"skillsHudTimeToLevel", "Time to level"},
		{"skillsHudXpHour", "Xp per hour"},
		{"skillsHudProgressBar", "Progress bar"},
	};

	private void showHudOptions(JComponent anchor)
	{
		JPopupMenu menu = new JPopupMenu();
		for (String[] option : HUD_OPTIONS)
		{
			JCheckBoxMenuItem item = new JCheckBoxMenuItem(option[1], plugin.isHudOption(option[0]));
			item.addActionListener(e -> plugin.setHudOption(option[0], item.isSelected()));
			menu.add(item);
		}
		menu.show(anchor, 0, anchor.getHeight());
	}
}