// FILE: ./internal/normalizers/openweather/wmo_map.go
package openweather

import "gitea.maximumdirect.net/ejr/weatherfeeder/model"

// mapOpenWeatherToWMO maps OpenWeather weather condition IDs into weatherfeeder's
// canonical WMO code vocabulary.
//
// This is an approximate semantic mapping between two different code systems.
// We map conservatively into the subset currently represented in standards.WMODescriptions.
func mapOpenWeatherToWMO(owmID int) model.WMOCode {
	switch {
	// 2xx Thunderstorm
	case owmID >= 200 && owmID <= 232:
		return 95

	// 3xx Drizzle
	case owmID >= 300 && owmID <= 321:
		if owmID == 300 {
			return 51
		}
		if owmID == 302 {
			return 55
		}
		return 53

	// 5xx Rain
	case owmID >= 500 && owmID <= 531:
		// 511 is "freezing rain"
		if owmID == 511 {
			return 67
		}

		// showers bucket (520-531)
		if owmID >= 520 && owmID <= 531 {
			if owmID == 520 {
				return 80
			}
			if owmID == 522 {
				return 82
			}
			return 81
		}

		// normal rain intensity
		if owmID == 500 {
			return 61
		}
		if owmID == 501 {
			return 63
		}
		if owmID >= 502 && owmID <= 504 {
			return 65
		}
		return 63

	// 6xx Snow
	case owmID >= 600 && owmID <= 622:
		if owmID == 600 {
			return 71
		}
		if owmID == 601 {
			return 73
		}
		if owmID == 602 {
			return 75
		}

		// Snow showers bucket (620-622)
		if owmID == 620 {
			return 85
		}
		if owmID == 621 || owmID == 622 {
			return 86
		}

		return 73

	// 7xx Atmosphere (mist/smoke/haze/dust/fog/etc.)
	case owmID >= 701 && owmID <= 781:
		return 45

	// 800 Clear
	case owmID == 800:
		return 0

	// 80x Clouds
	case owmID == 801:
		return 1
	case owmID == 802:
		return 2
	case owmID == 803 || owmID == 804:
		return 3

	default:
		return model.WMOUnknown
	}
}