From 3eebdfbe4a6033a0bef0acdaa13061dd830c65d6 Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Fri, 14 Aug 2026 19:40:42 +0200
Subject: refactor: split official climb concerns

---
 official_climb/matcher.go | 52 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 official_climb/matcher.go

(limited to 'official_climb/matcher.go')

diff --git a/official_climb/matcher.go b/official_climb/matcher.go
new file mode 100644
index 0000000..59c3e0e
--- /dev/null
+++ b/official_climb/matcher.go
@@ -0,0 +1,52 @@
+package official_climb
+
+import (
+	"math"
+
+	"github.com/jftuga/geodist"
+	"github.com/martinlehoux/biking_home/ride"
+)
+
+func MatchClimb(climb ride.Climb, officialClimbs []OfficialClimb, policy MatchPolicy) (OfficialClimb, bool) {
+	if policy.Validate() != nil {
+		return OfficialClimb{}, false
+	}
+	bestDistance := math.Inf(1)
+	var best OfficialClimb
+	found := false
+	for _, official := range officialClimbs {
+		startIndex, startDistance := nearestClimbPoint(climb, official.StartCoord)
+		endIndex, endDistance := nearestClimbPoint(climb, official.EndCoord)
+		if startDistance > policy.EndpointRadiusM || endDistance > policy.EndpointRadiusM {
+			continue
+		}
+		if startIndex >= endIndex {
+			continue
+		}
+		totalDistance := startDistance + endDistance
+		if totalDistance < bestDistance || (totalDistance == bestDistance && (!found || official.ID < best.ID)) {
+			best = official
+			bestDistance = totalDistance
+			found = true
+		}
+	}
+	return best, found
+}
+
+func nearestClimbPoint(climb ride.Climb, target geodist.Coord) (int, float64) {
+	bestIndex := climb.StartIndex()
+	bestDistance := math.Inf(1)
+	for index := climb.StartIndex(); index <= climb.EndIndex(); index++ {
+		distance := distanceM(climb.PointCoord(index), target)
+		if distance < bestDistance {
+			bestIndex = index
+			bestDistance = distance
+		}
+	}
+	return bestIndex, bestDistance
+}
+
+func distanceM(a, b geodist.Coord) float64 {
+	_, distanceKm := geodist.HaversineDistance(a, b)
+	return distanceKm * 1000
+}
-- 
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