package handler

import (
	"fmt"
	"github.com/paulmach/orb"
	"github.com/paulmach/orb/geojson"
	"google.golang.org/genproto/googleapis/maps/routing/v2"
)

func (h *SilvermobiHandler) GeoAutocomplete(text string, lat, lon float64) (*geojson.FeatureCollection, error) {
	result, err := h.Services.Geocoder.Autocomplete(text)
	if err != nil {
		return nil, err
	}
	return result, nil
}

func (h *SilvermobiHandler) GeoRoute(locations geojson.FeatureCollection) (route *routing.Route, err error) {
	route_locations := []orb.Point{}

	features_type := ""

	for _, f := range locations.Features {
		ft := f.Geometry.GeoJSONType()
		if features_type != "" && ft != features_type {
			return nil, fmt.Errorf("mixing different types of geometries in the feature collection is not allowed : %s and %s found", features_type, ft)
		}

		features_type = ft

		if features_type == "Point" {
			if point, ok := f.Geometry.(orb.Point); ok {
				route_locations = append(route_locations, point)
			}
		} else {
			return nil, fmt.Errorf("feature type %s not supported", features_type)
		}

		return nil, err
	}

	return route, nil
}

func (h *SilvermobiHandler) GeoReturnRoute(locations geojson.FeatureCollection) (route *routing.Route, err error) {
	loc := locations
	route.Polyline.String()
	reverse(loc.Features)

	return h.GeoRoute(loc)
}

func reverse[S ~[]E, E any](s S) {
	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
		s[i], s[j] = s[j], s[i]
	}
}