#!/usr/bin/env bash
#
# Pre-commit: normalise hike track altitudes.
#
# Any added/modified src/content/hikes/<slug>/track.gpx is run through
# scripts/fix-altitudes.ts (swisstopo swissALTI3D heights at each exact point)
# and re-staged, so committed tracks always carry corrected elevation instead of
# raw phone-GPS noise. Commits that don't touch a track.gpx are a fast no-op.
#
# Network failures degrade gracefully: fix-altitudes keeps a point's original
# elevation when it can't resolve it, exits 0, and the commit proceeds.
#
# Caveat: a touched track.gpx is re-staged in full, so partial (`git add -p`)
# staging of a track.gpx won't survive. These files are generated, so that's fine.
set -euo pipefail

# Staged Added/Copied/Modified track.gpx paths, NUL-delimited so non-ASCII slug
# dirs (e.g. "…pfäffikersee") come through as raw bytes, unquoted.
files=()
while IFS= read -r -d '' f; do
	case "$f" in
		src/content/hikes/*/track.gpx) files+=("$f") ;;
	esac
done < <(git diff --cached --name-only -z --diff-filter=ACM -- src/content/hikes)

if [ ${#files[@]} -eq 0 ]; then
	exit 0
fi

# Map each path to its <slug> (the directory under src/content/hikes/).
slugs=()
for f in "${files[@]}"; do
	s=${f#src/content/hikes/}
	slugs+=("${s%/track.gpx}")
done

echo "[pre-commit] fix-altitudes: ${slugs[*]}"
pnpm exec vite-node scripts/fix-altitudes.ts "${slugs[@]}"

# Re-stage so the corrected elevations are what actually gets committed.
git add -- "${files[@]}"