nws: refactored the NWS source files to relocate normalization logic to internal/normalizers.

internal/normalizers/common/wmo_text.go

@@ -0,0 +1,129 @@
+// FILE: ./internal/normalizers/common/wmo_text.go
+package common
+
+import (
+	"strings"
+
+	"gitea.maximumdirect.net/ejr/weatherfeeder/internal/model"
+)
+
+// WMOFromTextDescription is a cross-provider fallback that tries to infer a WMO code
+// from a human-readable condition string.
+//
+// This is intentionally “coarse” and conservative. It is useful when a provider:
+//
+//   - does not provide a condition code, or
+//   - provides it inconsistently / null, or
+//   - provides only textual conditions for some endpoints.
+//
+// Providers may still choose to override this with richer signals
+// (METAR phenomena, explicit numeric codes, etc.).
+func WMOFromTextDescription(desc string) model.WMOCode {
+	s := strings.ToLower(strings.TrimSpace(desc))
+	if s == "" {
+		return model.WMOUnknown
+	}
+
+	// Thunder / hail
+	if strings.Contains(s, "thunder") {
+		if strings.Contains(s, "hail") {
+			return 99
+		}
+		return 95
+	}
+
+	// Freezing hazards
+	if strings.Contains(s, "freezing rain") {
+		if strings.Contains(s, "light") {
+			return 66
+		}
+		return 67
+	}
+	if strings.Contains(s, "freezing drizzle") {
+		if strings.Contains(s, "light") {
+			return 56
+		}
+		return 57
+	}
+
+	// Drizzle
+	if strings.Contains(s, "drizzle") {
+		if strings.Contains(s, "heavy") || strings.Contains(s, "dense") {
+			return 55
+		}
+		if strings.Contains(s, "light") {
+			return 51
+		}
+		return 53
+	}
+
+	// Showers
+	if strings.Contains(s, "showers") {
+		if strings.Contains(s, "heavy") {
+			return 82
+		}
+		if strings.Contains(s, "light") {
+			return 80
+		}
+		return 81
+	}
+
+	// Rain
+	if strings.Contains(s, "rain") {
+		if strings.Contains(s, "heavy") {
+			return 65
+		}
+		if strings.Contains(s, "light") {
+			return 61
+		}
+		return 63
+	}
+
+	// Snow (check snow showers first)
+	if strings.Contains(s, "snow showers") {
+		if strings.Contains(s, "light") {
+			return 85
+		}
+		return 86
+	}
+	if strings.Contains(s, "snow grains") {
+		return 77
+	}
+	if strings.Contains(s, "snow") {
+		if strings.Contains(s, "heavy") {
+			return 75
+		}
+		if strings.Contains(s, "light") {
+			return 71
+		}
+		return 73
+	}
+
+	// Fog / mist
+	if strings.Contains(s, "rime fog") {
+		return 48
+	}
+	if strings.Contains(s, "fog") || strings.Contains(s, "mist") {
+		return 45
+	}
+
+	// Sky-only
+	if strings.Contains(s, "overcast") {
+		return 3
+	}
+	if strings.Contains(s, "cloudy") {
+		return 3
+	}
+	if strings.Contains(s, "partly cloudy") {
+		return 2
+	}
+	if strings.Contains(s, "mostly sunny") || strings.Contains(s, "mostly clear") ||
+		strings.Contains(s, "mainly sunny") || strings.Contains(s, "mainly clear") {
+		return 1
+	}
+	if strings.Contains(s, "clear") || strings.Contains(s, "sunny") {
+		return 0
+	}
+
+	return model.WMOUnknown
+}