Add better support for extracting address from reverse geocode results

Stadia's API sucks. They don't really tell you what their response will
be in detail, just claim they are all the same, but they're not. Not
even a little.

stadia/cmd/reverse-geocode/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+	"os"
+
+	"github.com/Gleipnir-Technology/nidus-sync/stadia"
+)
+
+func main() {
+	// Define command-line flags
+	lat := flag.Float64("lat", 0, "The latitude of the point")
+	lng := flag.Float64("lng", 0, "The longitude of the point")
+
+	// Parse the flags
+	flag.Parse()
+
+	if *lat == 0 || *lng == 0 {
+		log.Println("Error: you must specify both lat and lng")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	key := os.Getenv("STADIA_MAPS_API_KEY")
+	if key == "" {
+		log.Println("STADIA_MAPS_API_KEY is empty")
+		os.Exit(1)
+	}
+
+	client := stadia.NewStadiaMaps(key)
+	ctx := context.Background()
+	req := stadia.RequestReverseGeocode{
+		Latitude:  *lat,
+		Longitude: *lng,
+	}
+	resp, err := client.ReverseGeocode(ctx, req)
+	if err != nil {
+		log.Printf("err: %v\n", err)
+		os.Exit(2)
+	}
+	log.Printf("type: %s, features: %d\n", resp.Type, len(resp.Features))
+	for i, feature := range resp.Features {
+		log.Printf("feature %d: type %s\n", i, feature.Type)
+		log.Printf("\tgeometry %s (%f %f)\n", feature.Geometry.Type, feature.Geometry.Coordinates[0], feature.Geometry.Coordinates[1])
+		log.Printf("\tproperties %s\n", feature.Properties.Layer)
+	}
+}