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package market.guess.ui.desktop.util;
import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.List;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.util.StringConverter;
import market.guess.ui.desktop.model.ChartPoint;
/** Utilities for populating LineChart series and formatting time/value axes. */
public final class Charts {
private Charts() {}
public static final long BASE_TIME =
LocalDate.of(2026, 9, 12).atTime(9, 0).atZone(ZoneId.systemDefault()).toEpochSecond();
public static double toEpochSecond(double x) {
if (x >= 1_000_000_000) {
return x;
}
return BASE_TIME + (long) (x * 1800);
}
public static void setSingleSeries(
LineChart<Number, Number> chart, String name, List<ChartPoint> pts) {
configureTimeXAxis(chart, pts);
chart.getData().setAll(List.of(series(name, pts)));
}
public static void setDualSeries(
LineChart<Number, Number> chart,
String name1,
List<ChartPoint> pts1,
String name2,
List<ChartPoint> pts2) {
configureTimeXAxis(chart, (pts1 != null && !pts1.isEmpty()) ? pts1 : pts2);
chart.getData().setAll(List.of(series(name1, pts1), series(name2, pts2)));
}
public static void configureTimeXAxis(LineChart<Number, Number> chart, List<ChartPoint> pts) {
if (!(chart.getXAxis() instanceof NumberAxis xAxis)) return;
xAxis.setTickMarkVisible(true);
xAxis.setTickLabelsVisible(true);
xAxis.setMinorTickVisible(false);
xAxis.setForceZeroInRange(false);
if (pts == null || pts.isEmpty()) {
xAxis.setAutoRanging(true);
return;
}
double min = pts.stream().mapToDouble(p -> toEpochSecond(p.x())).min().orElse(BASE_TIME);
double max = pts.stream().mapToDouble(p -> toEpochSecond(p.x())).max().orElse(BASE_TIME + 3600);
if (min == max) {
min -= 60;
max += 60;
}
double range = max - min;
double targetInterval = range / 5.5;
double[] cleanIntervals = {
1, 5, 10, 15, 30, 60, 300, 600, 900, 1800, 3600, 7200, 14400, 21600, 43200, 86400
};
double tickUnit = cleanIntervals[cleanIntervals.length - 1];
for (double unit : cleanIntervals) {
if (unit >= targetInterval) {
tickUnit = unit;
break;
}
}
double lower = Math.floor(min / tickUnit) * tickUnit;
double upper = Math.ceil(max / tickUnit) * tickUnit;
if (upper <= max) {
upper += tickUnit;
}
xAxis.setAutoRanging(false);
xAxis.setLowerBound(lower);
xAxis.setUpperBound(upper);
xAxis.setTickUnit(tickUnit);
DateTimeFormatter fmt =
(range > 86400)
? DateTimeFormatter.ofPattern("MM-dd HH:mm").withZone(ZoneId.systemDefault())
: (range < 300)
? DateTimeFormatter.ofPattern("HH:mm:ss").withZone(ZoneId.systemDefault())
: DateTimeFormatter.ofPattern("HH:mm").withZone(ZoneId.systemDefault());
xAxis.setTickLabelFormatter(
new StringConverter<Number>() {
@Override
public String toString(Number n) {
if (n == null) return "";
try {
return fmt.format(Instant.ofEpochSecond(n.longValue()));
} catch (Exception e) {
return n.toString();
}
}
@Override
public Number fromString(String s) {
return 0;
}
});
}
/**
* Scales the Y axis dynamically with sensible headroom and round tick marks so values (like
* balances > $1,500) never get cut off at the top or bottom.
*/
public static void scaleYAxis(NumberAxis yAxis, List<ChartPoint> pts, Double currentVal) {
if (yAxis == null) return;
if ((pts == null || pts.isEmpty()) && currentVal == null) {
yAxis.setAutoRanging(true);
return;
}
double min =
(pts != null && !pts.isEmpty())
? pts.stream().mapToDouble(ChartPoint::y).min().orElse(0.0)
: (currentVal != null ? currentVal : 0.0);
double max =
(pts != null && !pts.isEmpty())
? pts.stream().mapToDouble(ChartPoint::y).max().orElse(100.0)
: (currentVal != null ? currentVal : 100.0);
if (currentVal != null) {
min = Math.min(min, currentVal);
max = Math.max(max, currentVal);
}
if (max <= 0 && min <= 0) {
double absMax = Math.abs(min);
double unit = niceNum(absMax / 4.0, true);
if (unit <= 0) unit = 50;
double lower = Math.floor(min / unit) * unit - unit;
yAxis.setAutoRanging(false);
yAxis.setLowerBound(lower);
yAxis.setUpperBound(0.0);
yAxis.setTickUnit(unit);
return;
}
double targetMax = max > 0 ? max * 1.15 : 100.0;
double targetMin = min < 0 ? min * 1.20 : 0.0;
double range = targetMax - targetMin;
double unit = niceNum(range / 5.0, true);
if (unit <= 0) unit = 50;
double lower = targetMin < 0 ? Math.floor(targetMin / unit) * unit : 0.0;
double upper = Math.ceil(targetMax / unit) * unit;
if (upper <= max) {
upper += unit;
}
yAxis.setAutoRanging(false);
yAxis.setLowerBound(lower);
yAxis.setUpperBound(upper);
yAxis.setTickUnit(unit);
}
private static double niceNum(double range, boolean round) {
if (range <= 0) return 1.0;
double exponent = Math.floor(Math.log10(range));
double fraction = range / Math.pow(10, exponent);
double niceFraction;
if (round) {
if (fraction < 1.5) niceFraction = 1.0;
else if (fraction < 3.0) niceFraction = 2.0;
else if (fraction < 7.0) niceFraction = 5.0;
else niceFraction = 10.0;
} else {
if (fraction <= 1.0) niceFraction = 1.0;
else if (fraction <= 2.0) niceFraction = 2.0;
else if (fraction <= 5.0) niceFraction = 5.0;
else niceFraction = 10.0;
}
return niceFraction * Math.pow(10, exponent);
}
private static XYChart.Series<Number, Number> series(String name, List<ChartPoint> pts) {
var s = new XYChart.Series<Number, Number>();
s.setName(name);
if (pts != null) {
for (var p : pts) {
s.getData().add(new XYChart.Data<>(toEpochSecond(p.x()), p.y()));
}
}
return s;
}
}
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