fix(emissions): update eMapsZonesResponse to match current Electricity Maps API

The /v3/zones endpoint now returns non-string typed fields (arrays,booleans, nullable strings) which cannot be unmarshaled into map[string]map[string]string. Replace with a proper struct.

Author: samoz83

pkg/emissions/emaps.go

@@ -84,17 +84,18 @@ func NewEMapsProvider(logger *slog.Logger) (Provider, error) {
 	zones := make(map[string]string, len(zoneData))
 
 	for zone, details := range zoneData {
-		// Check for countryName
-		var compoundName string
+		// Build compound name from countryName and zoneName
+		var parts []string
 
-		for _, name := range []string{"countryName", "zoneName"} {
-			if n, ok := details[name]; ok {
-				compoundName = fmt.Sprintf("%s %s", compoundName, n)
-			}
+		if details.CountryName != "" {
+			parts = append(parts, details.CountryName)
+		}
+
+		if details.ZoneName != "" {
+			parts = append(parts, details.ZoneName)
 		}
-		// Trim white spaces
-		compoundName = strings.TrimSpace(compoundName)
-		zones[zone] = compoundName
+
+		zones[zone] = strings.Join(parts, " ")
 	}
 
 	e := &emapsProvider{

pkg/emissions/emaps_test.go

@@ -106,7 +106,7 @@ func TestEMapsDataProviderError(t *testing.T) {
 
 func TestNewEMapsProvider(t *testing.T) {
 	// Start test server
-	expected := eMapsZonesResponse{"FR": map[string]string{"zoneName": "France"}}
+	expected := eMapsZonesResponse{"FR": eMapsZoneDetails{ZoneName: "France"}}
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		err := json.NewEncoder(w).Encode(&expected)

pkg/emissions/types.go

@@ -136,8 +136,20 @@ type CountryCode struct {
 	IsoCode []CountryCodeFields `json:"3166-1"`
 }
 
+// eMapsZoneDetails represents the details of a zone from the Electricity Maps API.
+type eMapsZoneDetails struct {
+	ZoneName                string   `json:"zoneName"`
+	CountryName             string   `json:"countryName"`
+	ZoneKey                 string   `json:"zoneKey"`
+	CountryCode             string   `json:"countryCode"`
+	ZoneParentKey           *string  `json:"zoneParentKey"`
+	SubZoneKeys             []string `json:"subZoneKeys"`
+	IsCommerciallyAvailable bool     `json:"isCommerciallyAvailable"`
+	Tier                    *string  `json:"tier"`
+}
+
 // Electricity Maps zones response signature.
-type eMapsZonesResponse map[string]map[string]string
+type eMapsZonesResponse map[string]eMapsZoneDetails
 
 // Electricity Maps carbon intensity response signature.
 type eMapsCarbonIntensityResponse struct {