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+# Stats Redesign — Design Spec
+
+*2026-06-19*
+
+---
+
+## Goal
+
+Expand trip statistics with new data points already available in entry frontmatter, add smart distance labelling based on whether GPX files are present, and add a dedicated cycling stats panel derived from GPX track data.
+
+---
+
+## Data sources
+
+| Source | Fields available |
+|---|---|
+| Entry frontmatter | `date`, `lat`, `lng`, `location_city`, `location_country`, `weather_temp_c` |
+| Trip page media | `.gpx` files (Komoot exports) |
+| GPX trackpoints | `lat`, `lon`, `<ele>` (meters), `<time>` (ISO 8601, 1s resolution) |
+| GPX track metadata | `<type>` (e.g. `racebike`, `hiking`) |
+
+---
+
+## Main stats block — changes
+
+The existing 4-stat grid expands to 6 stats. Both `stats.html.twig` and the inline toggle in `trip.html.twig` get the same treatment.
+
+### Stats
+
+| Stat | Label | Source | Notes |
+|---|---|---|---|
+| Days on the road | `days on the road` | `(now - first entry date) / 86400` | Unchanged |
+| Entries posted | `entries posted` | `all_entries\|length` | Unchanged |
+| Countries visited | `countries visited` | Deduplicated `location_country` | Unchanged; country list shown below grid |
+| **Cities visited** | `cities visited` | Deduplicated `location_city` | New; same dedup logic as countries |
+| Distance | see below | see below | Label + icon vary by mode |
+| **Temperature range** | `°C range` | `min(weather_temp_c)` – `max(weather_temp_c)` | New; shown as e.g. `−2 → 28 °C` |
+
+### Distance stat — two modes
+
+**Mode A — GPX present** (any `.gpx` files exist on the trip page):
+- Value: sum of haversine distances between all consecutive trackpoints across all GPX files
+- Label: `km cycled`
+- Icon: cycling icon (or activity-specific icon — see Icon system below)
+
+**Mode B — No GPX files:**
+- Value: sum of haversine distances between consecutive entry `lat`/`lng` points (current behaviour)
+- Label: `km roamed`
+- Icon: generic travel icon (compass / globe)
+
+Edge case — trip has both GPX files and many geo-spread entries (e.g. a mixed cycling + backpacking trip): use Mode A (GPX total only). This may understate total travel distance. Accepted limitation; revisit when transport mode is implemented.
+
+---
+
+## Cycling panel
+
+A separate expandable panel, independent of the main stats toggle. Only rendered when GPX files are present on the trip page.
+
+### Button placement
+
+Sits next to the existing Stats button in the filter bar area:
+
+```
+[ All ]  [ Journal ]  [ Stories ]          [ Stats ]  [ Cycling ]
+```
+
+The Cycling button is hidden entirely when no GPX files exist. Detection: server-side Twig filters `trip_page.media.all` for `.gpx` extension (same mechanism the map template already uses) and sets a boolean passed to the template.
+
+### Stats shown
+
+| Stat | Unit | How computed |
+|---|---|---|
+| Distance | km | Sum haversine between all trackpoints (same value as main stats Mode A) |
+| Elevation gain | m ↑ | Sum of positive `<ele>` differences (threshold: > 1 m per step to filter GPS noise) |
+| Elevation loss | m ↓ | Sum of negative `<ele>` differences (same threshold) |
+| Highest point | m | `max(<ele>)` across all files |
+| Lowest point | m | `min(<ele>)` across all files |
+| Moving time | h:mm | Total time excluding segments where computed speed < 1 km/h |
+| Average speed | km/h | Distance ÷ moving time |
+
+Max speed is explicitly excluded — GPS noise at 1-second resolution produces unreliable spikes.
+
+### Icon system
+
+The GPX `<type>` tag on the track element drives the icon shown in both the main stats distance block and the cycling panel header:
+
+| `<type>` value | Icon |
+|---|---|
+| `racebike` | Road bike |
+| `touringbicycle` | Touring bike |
+| `mtb` | Mountain bike |
+| `cycling` (generic) | Generic bike |
+| `hiking` | Hiking boot |
+| `hike` | Hiking boot |
+| Any unrecognised value | Generic bike (fallback) |
+
+When multiple GPX files exist with different types, use the type from the first file. This is an acceptable heuristic for now.
+
+---
+
+## GPX parsing — algorithm
+
+All parsing is client-side JavaScript. The template passes the list of GPX file URLs to a JS variable; JS fetches and processes them sequentially.
+
+```
+for each GPX file URL:
+  fetch(url) → text → DOMParser → XML document
+  extract all <trkpt> elements → array of { lat, lon, ele, time }
+  append to master trackpoint array
+
+compute over master array:
+  distance     = sum haversine(p[i-1], p[i]) for i in 1..n
+  ele_gain     = sum max(0, ele[i] - ele[i-1] - 1) for i in 1..n  (1m threshold)
+  ele_loss     = sum max(0, ele[i-1] - ele[i] - 1)
+  highest      = max(ele)
+  lowest       = min(ele)
+  speed[i]     = haversine(p[i-1], p[i]) / (time[i] - time[i-1]) in km/h
+  moving_time  = sum (time[i] - time[i-1]) where speed[i] >= 1 km/h
+  avg_speed    = distance / moving_time
+```
+
+The 1 m elevation threshold filters out the flat-line noise visible in the Komoot files (many consecutive identical `<ele>` values).
+
+---
+
+## Template changes
+
+| File | Change |
+|---|---|
+| `stats.html.twig` | Add cities stat, temp range stat; update distance stat with mode detection + label + icon |
+| `trip.html.twig` | Same stats changes; add Cycling button (hidden if no GPX); add cycling panel block with JS parsing |
+
+The cycling panel JS and the distance mode detection JS share the same GPX fetch logic — extract into a single `parseGpxFiles(urls)` function called once, results used by both.
+
+---
+
+## Out of scope
+
+- Transport mode per entry (deferred — tracked separately)
+- Weather breakdown (dropped — depends on free-text consistency)
+- Max speed stat (dropped — GPS noise)
+- Lowest point shown in main stats (cycling panel only)
+- Per-file breakdown (one aggregate across all GPX files)