pregenerated segments, tolerant matching, profile segment list, segment map

scripts/generate-segments.js

@@ -0,0 +1,281 @@
+#!/usr/bin/env node
+// Mine all activities for popular overlapping stretches and pregenerate
+// segments from the best ones (mirrors src/lib/server/segments.ts).
+//
+//   node scripts/generate-segments.js [--db data/streba.db] [--limit 8] [--dry]
+
+import Database from 'better-sqlite3';
+
+const args = process.argv.slice(2);
+const dbPath = args.includes('--db')
+	? args[args.indexOf('--db') + 1]
+	: (process.env.STREBA_DATA_DIR ?? 'data') + '/streba.db';
+const LIMIT = args.includes('--limit') ? parseInt(args[args.indexOf('--limit') + 1], 10) : 8;
+const DRY = args.includes('--dry');
+
+const CELL_DEG = 0.00028;
+const MIN_ACTIVITIES = 5;
+const MIN_STRETCH_M = 400;
+const CORRIDOR_M = 45;
+const SAMPLE_M = 30;
+
+const db = new Database(dbPath);
+db.pragma('journal_mode = WAL');
+db.pragma('busy_timeout = 5000');
+
+const R = 6371000;
+function haversine(lat1, lon1, lat2, lon2) {
+	const rad = Math.PI / 180;
+	const dLat = (lat2 - lat1) * rad;
+	const dLon = (lon2 - lon1) * rad;
+	const a =
+		Math.sin(dLat / 2) ** 2 + Math.cos(lat1 * rad) * Math.cos(lat2 * rad) * Math.sin(dLon / 2) ** 2;
+	return 2 * R * Math.asin(Math.sqrt(a));
+}
+const cellKey = (lat, lon) => `${Math.round(lat / CELL_DEG)}:${Math.round(lon / CELL_DEG)}`;
+function cumDist(pts) {
+	const d = [0];
+	for (let i = 1; i < pts.length; i++) {
+		d.push(d[i - 1] + haversine(pts[i - 1].lat, pts[i - 1].lon, pts[i].lat, pts[i].lon));
+	}
+	return d;
+}
+
+// ---- mining --------------------------------------------------------------
+const rows = db.prepare('SELECT id, name, user_id, date, points, bounds FROM activities').all();
+console.log(`Scanning ${rows.length} activities…`);
+
+const cellCounts = new Map();
+const parsed = rows.map((row) => {
+	const points = JSON.parse(row.points);
+	const seen = new Set();
+	for (const p of points) seen.add(cellKey(p.lat, p.lon));
+	for (const key of seen) cellCounts.set(key, (cellCounts.get(key) ?? 0) + 1);
+	return { ...row, points };
+});
+
+const claimed = new Set();
+for (const seg of db.prepare('SELECT points FROM segments').all()) {
+	for (const p of JSON.parse(seg.points)) claimed.add(cellKey(p.lat, p.lon));
+}
+
+const candidates = [];
+for (const activity of parsed) {
+	const d = cumDist(activity.points);
+	let runStart = -1;
+	let gap = 0;
+	let counts = [];
+	const flush = (endIdx) => {
+		if (runStart < 0) return;
+		const length = d[endIdx] - d[runStart];
+		if (length >= MIN_STRETCH_M) {
+			const cells = new Set();
+			for (let i = runStart; i <= endIdx; i++) {
+				cells.add(cellKey(activity.points[i].lat, activity.points[i].lon));
+			}
+			const avg = counts.reduce((s, c) => s + c, 0) / counts.length;
+			candidates.push({
+				activity,
+				startIdx: runStart,
+				endIdx,
+				startD: d[runStart],
+				endD: d[endIdx],
+				length,
+				avg,
+				cells,
+				score: length * avg
+			});
+		}
+		runStart = -1;
+		counts = [];
+	};
+	for (let i = 0; i < activity.points.length; i++) {
+		const count = cellCounts.get(cellKey(activity.points[i].lat, activity.points[i].lon)) ?? 0;
+		if (count > MIN_ACTIVITIES && !claimed.has(cellKey(activity.points[i].lat, activity.points[i].lon))) {
+			if (runStart < 0) runStart = i;
+			gap = 0;
+			counts.push(count);
+		} else if (runStart >= 0 && ++gap > 4) {
+			flush(i - gap);
+		}
+	}
+	flush(activity.points.length - 1);
+}
+
+candidates.sort((a, b) => b.score - a.score);
+const accepted = [];
+const used = new Set();
+for (const c of candidates) {
+	if (accepted.length >= LIMIT) break;
+	let overlap = 0;
+	for (const cell of c.cells) if (used.has(cell)) overlap++;
+	if (overlap / c.cells.size > 0.4) continue;
+	for (const cell of c.cells) used.add(cell);
+	accepted.push(c);
+}
+console.log(`Found ${candidates.length} candidate stretches, keeping top ${accepted.length}.`);
+
+// ---- naming --------------------------------------------------------------
+const nearestPeak = db.prepare(
+	`SELECT name FROM peaks
+	 WHERE lat BETWEEN ? - 0.03 AND ? + 0.03 AND lon BETWEEN ? - 0.045 AND ? + 0.045
+	 ORDER BY ((lat - ?) * (lat - ?)) + ((lon - ?) * (lon - ?)) * 0.5 ASC LIMIT 1`
+);
+const usedNames = new Set(
+	db.prepare('SELECT name FROM segments').all().map((s) => s.name)
+);
+function direction(first, last) {
+	const dLat = last.lat - first.lat;
+	const dLon = (last.lon - first.lon) * Math.cos((first.lat * Math.PI) / 180);
+	return Math.abs(dLat) > Math.abs(dLon) ? (dLat > 0 ? 'North' : 'South') : dLon > 0 ? 'East' : 'West';
+}
+function nameFor(candidate, slice) {
+	const first = slice[0];
+	const last = slice[slice.length - 1];
+	const gain = last.ele !== null && first.ele !== null ? last.ele - first.ele : 0;
+	const grade = (gain / candidate.length) * 100;
+	const kind = grade > 3 ? 'Climb' : grade < -3 ? 'Descent' : 'Stretch';
+	const mid = slice[Math.floor(slice.length / 2)];
+	const peak = nearestPeak.get(mid.lat, mid.lat, mid.lon, mid.lon, mid.lat, mid.lat, mid.lon, mid.lon);
+	const base = peak ? peak.name : candidate.activity.name;
+	let name = `${base} ${kind}`;
+	if (usedNames.has(name)) name = `${base} ${kind} ${direction(first, last)}`;
+	usedNames.add(name);
+	return name;
+}
+
+// ---- creation + effort matching -----------------------------------------
+function checkpoints(points) {
+	const d = cumDist(points);
+	const out = [points[0]];
+	let next = SAMPLE_M;
+	for (let i = 1; i < points.length - 1; i++) {
+		if (d[i] >= next) {
+			out.push(points[i]);
+			next = d[i] + SAMPLE_M;
+		}
+	}
+	out.push(points[points.length - 1]);
+	return out;
+}
+// mirrors computeEffort in src/lib/server/segments.ts (tolerant matcher)
+function computeEffort(segPoints, actPoints) {
+	if (segPoints.length < 2 || actPoints.length < 2) return null;
+	const cps = checkpoints(segPoints);
+	const cpD = cumDist(cps);
+	const actD = cumDist(actPoints);
+	const start = cps[0];
+	const maxMiss = Math.max(1, Math.floor(cps.length * 0.1));
+	const cands = [];
+	for (let i = 0; i < actPoints.length; i++) {
+		if (haversine(actPoints[i].lat, actPoints[i].lon, start.lat, start.lon) <= CORRIDOR_M) {
+			if (cands.length === 0 || i - cands[cands.length - 1] > 15) cands.push(i);
+		}
+	}
+	let matched = false;
+	let best = null;
+	for (const s of cands) {
+		let j = s;
+		let misses = 0;
+		let ok = true;
+		for (let k = 1; k < cps.length; k++) {
+			const limit = actD[s] + cpD[k] * 1.5 + 150;
+			let found = -1;
+			for (let jj = j; jj < actPoints.length && actD[jj] <= limit; jj++) {
+				if (haversine(actPoints[jj].lat, actPoints[jj].lon, cps[k].lat, cps[k].lon) <= CORRIDOR_M) {
+					found = jj;
+					break;
+				}
+			}
+			if (found >= 0) {
+				j = found;
+			} else if (k === cps.length - 1 || ++misses > maxMiss) {
+				ok = false;
+				break;
+			}
+		}
+		if (!ok) continue;
+		matched = true;
+		const t0 = actPoints[s].t;
+		const t1 = actPoints[j].t;
+		if (t0 !== null && t1 !== null && t1 > t0) best = best === null ? t1 - t0 : Math.min(best, t1 - t0);
+	}
+	return matched ? { elapsed_s: best } : null;
+}
+function gainOf(points) {
+	let gain = 0;
+	let ref = null;
+	for (const p of points) {
+		if (p.ele === null) continue;
+		if (ref === null) ref = p.ele;
+		const diff = p.ele - ref;
+		if (diff >= 3) {
+			gain += diff;
+			ref = p.ele;
+		} else if (diff <= -3) ref = p.ele;
+	}
+	return gain;
+}
+
+const insertSegment = db.prepare(
+	`INSERT INTO segments (name, creator_id, points, bounds, distance_m, elev_gain_m)
+	 VALUES (?, NULL, ?, ?, ?, ?)`
+);
+const insertEffort = db.prepare(
+	`INSERT INTO segment_efforts (segment_id, activity_id, user_id, elapsed_s, date)
+	 VALUES (?, ?, ?, ?, ?) ON CONFLICT (segment_id, activity_id) DO NOTHING`
+);
+
+// --rematch: wipe and recompute every segment's efforts, then exit
+if (args.includes('--rematch')) {
+	db.prepare('DELETE FROM segment_efforts').run();
+	for (const segment of db.prepare('SELECT id, name, points FROM segments').all()) {
+		const segPoints = JSON.parse(segment.points);
+		let efforts = 0;
+		for (const activity of parsed) {
+			const effort = computeEffort(segPoints, activity.points);
+			if (effort) {
+				insertEffort.run(segment.id, activity.id, activity.user_id, effort.elapsed_s, activity.date);
+				efforts++;
+			}
+		}
+		console.log(`Rematched "${segment.name}" - ${efforts} efforts.`);
+	}
+	process.exit(0);
+}
+
+for (const candidate of accepted) {
+	const slice = candidate.activity.points.slice(candidate.startIdx, candidate.endIdx + 1);
+	const name = nameFor(candidate, slice);
+	const km = (candidate.length / 1000).toFixed(1);
+	if (DRY) {
+		console.log(`[dry] would create "${name}" (${km} km, ~${Math.round(candidate.avg)} activities)`);
+		continue;
+	}
+	let minLat = Infinity, minLon = Infinity, maxLat = -Infinity, maxLon = -Infinity;
+	for (const p of slice) {
+		minLat = Math.min(minLat, p.lat);
+		maxLat = Math.max(maxLat, p.lat);
+		minLon = Math.min(minLon, p.lon);
+		maxLon = Math.max(maxLon, p.lon);
+	}
+	const result = insertSegment.run(
+		name,
+		JSON.stringify(slice.map((p) => ({ lat: p.lat, lon: p.lon, ele: p.ele, t: null }))),
+		JSON.stringify([[minLat, minLon], [maxLat, maxLon]]),
+		candidate.length,
+		gainOf(slice)
+	);
+	const segmentId = Number(result.lastInsertRowid);
+	const segPoints = slice;
+	let efforts = 0;
+	for (const activity of parsed) {
+		const effort = computeEffort(segPoints, activity.points);
+		if (effort) {
+			insertEffort.run(segmentId, activity.id, activity.user_id, effort.elapsed_s, activity.date);
+			efforts++;
+		}
+	}
+	console.log(`Created "${name}" (${km} km) - ${efforts} efforts.`);
+}
+console.log('Done.');

src/lib/server/db.ts

@@ -450,6 +450,51 @@ export function segmentLeaderboard(segmentId: number): {
 	}[];
 }
 
+/** All segments a user has completed, with their best time, attempts, and rank. */
+export function userSegments(userId: number): {
+	id: number;
+	name: string;
+	distance_m: number;
+	elev_gain_m: number;
+	attempts: number;
+	best_s: number | null;
+	rank: number | null;
+}[] {
+	return db
+		.prepare(
+			`SELECT s.id, s.name, s.distance_m, s.elev_gain_m,
+			        count(e.id) attempts,
+			        min(e.elapsed_s) best_s,
+			        CASE WHEN min(e.elapsed_s) IS NULL THEN NULL ELSE (
+			          SELECT count(*) + 1 FROM (
+			            SELECT min(e2.elapsed_s) b FROM segment_efforts e2
+			            WHERE e2.segment_id = s.id AND e2.elapsed_s IS NOT NULL AND e2.user_id != @userId
+			            GROUP BY e2.user_id
+			          ) others WHERE others.b < min(e.elapsed_s)
+			        ) END rank
+			 FROM segments s JOIN segment_efforts e ON e.segment_id = s.id AND e.user_id = @userId
+			 GROUP BY s.id ORDER BY attempts DESC, s.name`
+		)
+		.all({ userId }) as {
+		id: number;
+		name: string;
+		distance_m: number;
+		elev_gain_m: number;
+		attempts: number;
+		best_s: number | null;
+		rank: number | null;
+	}[];
+}
+
+export function deleteSegment(id: number, userId: number): boolean {
+	// creators may delete their segments; system-generated ones (no creator)
+	// may be removed by any signed-in user
+	const result = db
+		.prepare('DELETE FROM segments WHERE id = ? AND (creator_id = ? OR creator_id IS NULL)')
+		.run(id, userId);
+	return result.changes > 0;
+}
+
 export function segmentEffortsForActivity(activityId: number): { segment_id: number; name: string; elapsed_s: number | null }[] {
 	return db
 		.prepare(

src/lib/server/segments.ts

@@ -37,7 +37,9 @@ function checkpoints<T extends { lat: number; lon: number }>(points: T[]): T[] {
 
 /**
  * Try to find the segment inside an activity: the activity must pass the
- * segment start, then every checkpoint in order within the corridor.
+ * segment start, then the checkpoints in order within the corridor. A small
+ * fraction of checkpoints may be missed (GPS noise, brief detours), but the
+ * final checkpoint must be reached. Direction matters.
  * Returns the best (fastest) timed effort, an untimed match, or null.
  */
 export function computeEffort(
@@ -46,7 +48,10 @@ export function computeEffort(
 ): { elapsed_s: number | null } | null {
 	if (segPoints.length < 2 || actPoints.length < 2) return null;
 	const cps = checkpoints(segPoints);
+	const cpD = cumDist(cps);
+	const actD = cumDist(actPoints);
 	const start = cps[0];
+	const maxMiss = Math.max(1, Math.floor(cps.length * 0.1));
 
 	// candidate entries: activity points near the segment start (spaced apart to
 	// catch repeat laps without re-testing every neighbouring point)
@@ -61,20 +66,27 @@ export function computeEffort(
 	let best: number | null = null;
 	for (const s of candidates) {
 		let j = s;
+		let misses = 0;
 		let ok = true;
 		for (let k = 1; k < cps.length; k++) {
-			while (
-				j < actPoints.length &&
-				haversine(actPoints[j].lat, actPoints[j].lon, cps[k].lat, cps[k].lon) > CORRIDOR_M
-			) {
-				j++;
-			}
-			if (j >= actPoints.length) {
-				ok = false;
+			// only search as far along the activity as this checkpoint could
+			// plausibly be (with generous slack for wiggly tracks)
+			const limit = actD[s] + cpD[k] * 1.5 + 150;
+			let found = -1;
+			for (let jj = j; jj < actPoints.length && actD[jj] <= limit; jj++) {
+				if (haversine(actPoints[jj].lat, actPoints[jj].lon, cps[k].lat, cps[k].lon) <= CORRIDOR_M) {
+					found = jj;
 					break;
 				}
 			}
-		if (!ok) break; // ran off the end of the activity; later candidates would too
+			if (found >= 0) {
+				j = found;
+			} else if (k === cps.length - 1 || ++misses > maxMiss) {
+				ok = false; // the finish itself may never be missed
+				break;
+			}
+		}
+		if (!ok) continue;
 		matched = true;
 		const t0 = actPoints[s].t;
 		const t1 = actPoints[j].t;

src/routes/segments/[id]/+page.server.ts

@@ -1,6 +1,6 @@
-import { error } from '@sveltejs/kit';
-import { getSegment, segmentLeaderboard } from '$lib/server/db';
-import type { PageServerLoad } from './$types';
+import { error, redirect } from '@sveltejs/kit';
+import { deleteSegment, getSegment, segmentLeaderboard } from '$lib/server/db';
+import type { Actions, PageServerLoad } from './$types';
 import type { TrackPt } from '$lib/server/segments';
 
 export const load: PageServerLoad = ({ params, locals }) => {
@@ -12,6 +12,16 @@ export const load: PageServerLoad = ({ params, locals }) => {
 		segment: { ...segment, points: undefined },
 		latlngs: points.map((p) => [p.lat, p.lon] as [number, number]),
 		leaderboard: segmentLeaderboard(segment.id),
-		myUserId: locals.user?.id ?? null
+		myUserId: locals.user?.id ?? null,
+		canDelete:
+			!!locals.user && (segment.creator_id === locals.user.id || segment.creator_id === null)
 	};
 };
+
+export const actions: Actions = {
+	delete: async ({ params, locals }) => {
+		if (!locals.user) error(401, 'Not signed in');
+		deleteSegment(Number(params.id), locals.user.id);
+		redirect(303, '/segments');
+	}
+};

src/routes/segments/[id]/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+	import { enhance } from '$app/forms';
 	import MapSlot from '$lib/components/MapSlot.svelte';
 	import StatTile from '$lib/components/StatTile.svelte';
 	import { mapState } from '$lib/map-state.svelte';
@@ -26,10 +27,27 @@
 	<title>{s.name} · Streba</title>
 </svelte:head>
 
+<MapSlot />
+
 <a class="back" href="/segments">← Segments</a>
 
-<h1>{s.name}</h1>
-<p class="page-sub">Segment · created {fmtDate(s.created_at.slice(0, 10))}</p>
+<div class="head">
+	<div>
+		<h1>{s.name}</h1>
+		<p class="page-sub">Segment · created {fmtDate(s.created_at.slice(0, 10))}</p>
+	</div>
+	{#if data.canDelete}
+		<form
+			method="POST"
+			action="?/delete"
+			use:enhance={({ cancel }) => {
+				if (!confirm('Delete this segment and all its efforts?')) cancel();
+			}}
+		>
+			<button class="btn danger" type="submit">Delete</button>
+		</form>
+	{/if}
+</div>
 
 <div class="kpis">
 	<StatTile label="Distance" value={fmtDistance(s.distance_m)} />
@@ -81,6 +99,12 @@
 		background: var(--wash);
 		color: var(--text-primary);
 	}
+	.head {
+		display: flex;
+		justify-content: space-between;
+		align-items: flex-start;
+		gap: 1rem;
+	}
 	.kpis {
 		display: grid;
 		grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));

src/routes/users/[username]/+page.server.ts

@@ -1,5 +1,12 @@
 import { error } from '@sveltejs/kit';
-import { countAscents, getProfile, listActivities, listAscents, userStats } from '$lib/server/db';
+import {
+	countAscents,
+	getProfile,
+	listActivities,
+	listAscents,
+	userSegments,
+	userStats
+} from '$lib/server/db';
 import type { PageServerLoad } from './$types';
 
 export const load: PageServerLoad = ({ params }) => {
@@ -12,6 +19,7 @@ export const load: PageServerLoad = ({ params }) => {
 		stats: userStats(profile.id),
 		peaksReached: countAscents(profile.id),
 		highestAscent: ascents[0] ?? null,
+		segments: userSegments(profile.id),
 		activities: listActivities(profile.id).slice(0, 10)
 	};
 };

src/routes/users/[username]/+page.svelte

@@ -2,7 +2,7 @@
 	import Avatar from '$lib/components/Avatar.svelte';
 	import ActivityItem from '$lib/components/ActivityItem.svelte';
 	import StatTile from '$lib/components/StatTile.svelte';
-	import { fmtDistance, fmtDuration, fmtElevation } from '$lib/format';
+	import { fmtDistance, fmtDuration, fmtElapsed, fmtElevation } from '$lib/format';
 
 	let { data } = $props();
 	const p = $derived(data.profile);
@@ -41,6 +41,28 @@
 	</div>
 {/if}
 
+{#if data.segments.length > 0}
+	<h2>Segments</h2>
+	<div class="card seg-list">
+		{#each data.segments as segment (segment.id)}
+			<a class="seg-row" href="/segments/{segment.id}">
+				<span class="seg-name">
+					{#if segment.rank === 1}<span class="crown" title="Course record">👑</span>{/if}
+					{segment.name}
+				</span>
+				<span class="seg-meta">
+					{fmtDistance(segment.distance_m)} · {segment.attempts}
+					{segment.attempts === 1 ? 'attempt' : 'attempts'}
+					{#if segment.best_s !== null}
+						· best {fmtElapsed(segment.best_s)}
+						{#if segment.rank !== null}· #{segment.rank}{/if}
+					{/if}
+				</span>
+			</a>
+		{/each}
+	</div>
+{/if}
+
 <h2>Recent activities</h2>
 {#if data.activities.length === 0}
 	<div class="card empty">No activities yet.</div>
@@ -91,6 +113,32 @@
 	.list :global(.item:not(:last-child)) {
 		border-bottom: 1px solid var(--border);
 	}
+	.seg-list > .seg-row:not(:last-child) {
+		border-bottom: 1px solid var(--border);
+	}
+	.seg-row {
+		display: flex;
+		flex-direction: column;
+		padding: 0.75rem 1.15rem;
+		text-decoration: none;
+		color: inherit;
+		transition: background 120ms;
+	}
+	.seg-row:hover {
+		background: var(--wash);
+	}
+	.seg-name {
+		font-weight: 600;
+		font-size: 0.92rem;
+	}
+	.crown {
+		font-size: 0.85rem;
+	}
+	.seg-meta {
+		font-size: 0.8rem;
+		color: var(--text-secondary);
+		font-variant-numeric: tabular-nums;
+	}
 	.empty {
 		padding: 1.5rem;
 		text-align: center;