Fix the powder widget to also display the diff

src/main/java/de/hysky/skyblocker/skyblock/tabhud/widget/PowderWidget.java

@@ -1,39 +1,119 @@
 package de.hysky.skyblocker.skyblock.tabhud.widget;
 
-
 import de.hysky.skyblocker.annotations.RegisterWidget;
 import de.hysky.skyblocker.skyblock.tabhud.util.Ico;
 import de.hysky.skyblocker.skyblock.tabhud.widget.component.IcoTextComponent;
-import de.hysky.skyblocker.skyblock.tabhud.widget.component.PlainTextComponent;
 import net.minecraft.text.MutableText;
 import net.minecraft.text.Text;
 import net.minecraft.util.Formatting;
+import net.minecraft.util.Util;
+import org.apache.commons.lang3.math.NumberUtils;
 
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
 import java.util.List;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 // this widget shows how much mithril and gemstone powder you have
 // (dwarven mines and crystal hollows)
 @RegisterWidget
 public class PowderWidget extends TabHudWidget {
+	private static final MutableText TITLE = Text.literal("Powders").formatted(Formatting.DARK_AQUA, Formatting.BOLD);
+	private static final DecimalFormat DECIMAL_FORMAT = (DecimalFormat) NumberFormat.getInstance(Locale.ENGLISH);
+	private static final short UPDATE_INTERVAL = 2000;
+
+	static {
+		DECIMAL_FORMAT.setPositivePrefix("+"); // Causes the positive sign to be displayed for positive numbers, while the negative sign is always displayed for negative numbers. This removes the need to prepend a + if positive.
+	}
 
-	private static final MutableText TITLE = Text.literal("Powders").formatted(Formatting.DARK_AQUA,
-			Formatting.BOLD);
+	// Patterns to match the playerlist lines against
+	private static final Pattern MITHRIL_PATTERN = Pattern.compile("Mithril: ([\\d,]+)");
+	private static final Pattern GEMSTONE_PATTERN = Pattern.compile("Gemstone: ([\\d,]+)");
+	private static final Pattern GLACITE_PATTERN = Pattern.compile("Glacite: ([\\d,]+)");
+	// Amounts from last update
+	private int lastMithril = 0;
+	private int lastGemstone = 0;
+	private int lastGlacite = 0;
+	// The amount difference between the 2nd last and last update
+	private int lastMithrilDiff = 0;
+	private int lastGemstoneDiff = 0;
+	private int lastGlaciteDiff = 0;
+	// A bitfield to keep track of which powders have been updated.
+	// First 3 bits represent mithril, gemstone and glacite respectively, with 1 being found and 0 being not found.
+	// The 4th bit is for whether the current tick caused an update, which will change the value of lastUpdate when 1.
+	private byte updated = 0b0000;
+	private long lastUpdate = 0;
 
 	public PowderWidget() {
 		super("Powders", TITLE, Formatting.DARK_AQUA.getColorValue());
 	}
 
 	@Override
 	public void updateContent(List<Text> lines) {
+		Matcher matcher = Pattern.compile("").matcher(""); // Placeholder pattern and input to construct a matcher that can be reused
+		long msAfterLastUpdate = Util.getMeasuringTimeMs() - lastUpdate;
+
 		for (Text line : lines) {
-			switch (line.getString().toLowerCase()) {
-				case String s when s.contains("mithril") -> this.addComponent(new IcoTextComponent(Ico.MITHRIL, line));
-				case String s when s.contains("gemstone") -> this.addComponent(new IcoTextComponent(Ico.AMETHYST_SHARD, line));
-				case String s when s.contains("glacite") -> this.addComponent(new IcoTextComponent(Ico.BLUE_ICE, line));
-				default -> this.addComponent(new PlainTextComponent(line));
+			switch (matcher.reset(line.getString())) {
+				case Matcher m when m.usePattern(MITHRIL_PATTERN).matches() -> {
+					int mithril = parseAmount(m);
+					// Generally this will only work if the update interval has passed, but we also don't want to stall the update if the amount has changed
+					if (mithril != lastMithril || msAfterLastUpdate > UPDATE_INTERVAL) {
+						lastMithrilDiff = mithril - lastMithril;
+						updated |= 0b1000;
+						addComponent(new IcoTextComponent(Ico.MITHRIL, getTextToDisplay(lastMithrilDiff, line, Formatting.DARK_GREEN)));
+						lastMithril = mithril;
+					} else {
+						addComponent(new IcoTextComponent(Ico.MITHRIL, getTextToDisplay(lastMithrilDiff, line, Formatting.DARK_GREEN)));
+					}
+					updated |= 0b001;
+				}
+				case Matcher m when m.usePattern(GEMSTONE_PATTERN).matches() -> {
+					int gemstone = parseAmount(m);
+					// Generally this will only work if the update interval has passed, but we also don't want to stall the update if the amount has changed
+					if (gemstone != lastGemstone || msAfterLastUpdate > UPDATE_INTERVAL) {
+						lastGemstoneDiff = gemstone - lastGemstone;
+						updated |= 0b1000;
+						addComponent(new IcoTextComponent(Ico.AMETHYST_SHARD, getTextToDisplay(lastGemstoneDiff, line, Formatting.LIGHT_PURPLE)));
+						lastGemstone = gemstone;
+					} else {
+						addComponent(new IcoTextComponent(Ico.AMETHYST_SHARD, getTextToDisplay(lastGemstoneDiff, line, Formatting.LIGHT_PURPLE)));
+					}
+					updated |= 0b010;
+				}
+				case Matcher m when m.usePattern(GLACITE_PATTERN).matches() -> {
+					int glacite = parseAmount(m);
+					// Generally this will only work if the update interval has passed, but we also don't want to stall the update if the amount has changed
+					if (glacite != lastGlacite || msAfterLastUpdate > UPDATE_INTERVAL) {
+						lastGlaciteDiff = glacite - lastGlacite;
+						updated |= 0b1000;
+						addComponent(new IcoTextComponent(Ico.BLUE_ICE, getTextToDisplay(lastGlaciteDiff, line, Formatting.AQUA)));
+						lastGlacite = glacite;
+					} else {
+						addComponent(new IcoTextComponent(Ico.BLUE_ICE, getTextToDisplay(lastGlaciteDiff, line, Formatting.AQUA)));
+					}
+					updated |= 0b100;
+				}
+				default -> {}
 			}
+			if ((updated & 0b111) == 0b111) break; // All powder counts have been updated, no need to continue
 		}
+		if ((updated & 0b1000) == 0b1000) lastUpdate = Util.getMeasuringTimeMs();
+		updated = 0b0000; // Reset the bitfield for the next tick
+	}
+
+	private int parseAmount(Matcher matcher) {
+		return NumberUtils.toInt(matcher.group(1).replace(",", ""));
+	}
 
+	private MutableText getAppendix(int diff, Formatting formatting) {
+		return Text.literal(" (" + DECIMAL_FORMAT.format(diff) + ")").formatted(formatting);
 	}
 
+	// Decides whether the appendix should be appended to the line
+	private Text getTextToDisplay(int diff, Text line, Formatting formatting) {
+		return diff != 0 ? line.copy().append(getAppendix(diff, formatting)) : line;
+	}
 }