// FILE: ./internal/normalizers/nws/metar.go
package nws

import (
	"encoding/json"
	"strings"
)

// metarPhenomenon is a typed view of NWS presentWeather objects.
type metarPhenomenon struct {
	Intensity  *string `json:"intensity"` // "light", "heavy", or null
	Modifier   *string `json:"modifier"`  // "freezing", "showers", etc., or null
	Weather    string  `json:"weather"`   // e.g. "rain", "snow", "fog_mist", ...
	RawString  string  `json:"rawString"`
	InVicinity *bool   `json:"inVicinity"`
}

func decodeMetarPhenomena(raw []map[string]any) []metarPhenomenon {
	if len(raw) == 0 {
		return nil
	}

	out := make([]metarPhenomenon, 0, len(raw))
	for _, m := range raw {
		b, err := json.Marshal(m)
		if err != nil {
			continue
		}

		var p metarPhenomenon
		if err := json.Unmarshal(b, &p); err != nil {
			continue
		}

		p.Weather = strings.ToLower(strings.TrimSpace(p.Weather))
		p.RawString = strings.TrimSpace(p.RawString)
		out = append(out, p)
	}

	return out
}

func containsWeather(phenomena []metarPhenomenon, weather string) bool {
	weather = strings.ToLower(strings.TrimSpace(weather))
	for _, p := range phenomena {
		if p.Weather == weather {
			return true
		}
	}
	return false
}