// 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
}