feat: polish

mocks/handlers/prediction.ts

@@ -0,0 +1,56 @@
+import type { FlightParameters } from '../../src/lib/domain/scenario';
+
+/**
+ * Generate a fake prediction trajectory. We fake an ascent phase that climbs
+ * to burst_altitude at ascent_rate, then a descent at descent_rate. The
+ * ground track drifts roughly east as a function of altitude to loosely
+ * mimic wind drift.
+ */
+export function fakePrediction(params: FlightParameters & { launch_datetime: string }) {
+	const launch = new Date(params.launch_datetime);
+	const ascentDurationSec = Math.round(
+		(params.burst_altitude - params.launch_altitude) / params.ascent_rate,
+	);
+	const descentDurationSec = Math.round(params.burst_altitude / params.descent_rate);
+	const stepSec = 30;
+
+	const ascent: unknown[] = [];
+	for (let t = 0; t <= ascentDurationSec; t += stepSec) {
+		const alt = params.launch_altitude + t * params.ascent_rate;
+		ascent.push({
+			altitude: alt,
+			datetime: new Date(launch.getTime() + t * 1000).toISOString(),
+			latitude: params.launch_latitude + t * 0.00002,
+			longitude: params.launch_longitude + t * 0.00005,
+		});
+	}
+
+	const descent: unknown[] = [];
+	const burstTime = launch.getTime() + ascentDurationSec * 1000;
+	const burstLat = params.launch_latitude + ascentDurationSec * 0.00002;
+	const burstLng = params.launch_longitude + ascentDurationSec * 0.00005;
+	for (let t = 0; t <= descentDurationSec; t += stepSec) {
+		const alt = Math.max(0, params.burst_altitude - t * params.descent_rate);
+		descent.push({
+			altitude: alt,
+			datetime: new Date(burstTime + t * 1000).toISOString(),
+			latitude: burstLat + t * 0.00001,
+			longitude: burstLng + t * 0.00003,
+		});
+	}
+
+	return {
+		result: {
+			metadata: {
+				start_datetime: new Date(launch.getTime() - 3600 * 1000).toISOString(),
+				complete_datetime: new Date(
+					burstTime + descentDurationSec * 1000,
+				).toISOString(),
+			},
+			prediction: [
+				{ stage: 'ascent', trajectory: ascent },
+				{ stage: 'descent', trajectory: descent },
+			],
+		},
+	};
+}