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package official_climb
import (
"math"
"github.com/jftuga/geodist"
"github.com/martinlehoux/biking_home/geo"
)
// MatchedClimb is an official climb that lies on a route, together with the
// route point indexes of its start and end. It lets the climb detector know
// which segment of the route is already claimed by an official climb.
type MatchedClimb struct {
OfficialClimb
StartIndex int
EndIndex int
}
// MatchClimb matches an official climb against a route purely by
// coordinates: both the start and end coordinates must be within radiusM of a
// route point, and the matched start point must precede the matched end point.
func MatchClimb(route []geodist.Coord, official OfficialClimb, radiusM float64) (MatchedClimb, bool) {
if math.IsNaN(radiusM) || math.IsInf(radiusM, 0) || radiusM <= 0 {
return MatchedClimb{}, false
}
startIndex, startDistance := geo.Nearest(route, official.StartCoord)
endIndex, endDistance := geo.Nearest(route, official.EndCoord)
if startDistance > radiusM || endDistance > radiusM {
return MatchedClimb{}, false
}
if startIndex >= endIndex {
return MatchedClimb{}, false
}
return MatchedClimb{OfficialClimb: official, StartIndex: startIndex, EndIndex: endIndex}, true
}
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