package web

import "time"

// Weather is the seasonal effect rendered behind the page. Tuned for Lisbon:
// winter is rainy (not snowy), May gets its own jacaranda variant since the
// city turns purple for a few weeks each year, and September stays in summer
// because Portugal's dry spell runs all the way through it.
type Weather struct {
	Season    string // "winter" | "spring" | "summer" | "autumn"
	Variant   string // "rain" | "petals" | "jacaranda" | "motes" | "leaves"
	Intensity string // "light" | "medium" | "heavy"
}

var lisbon = func() *time.Location {
	loc, err := time.LoadLocation("Europe/Lisbon")
	if err != nil {
		return time.UTC
	}
	return loc
}()

func currentWeather(now time.Time) Weather {
	t := now.In(lisbon)
	var season, variant string
	switch t.Month() {
	case time.December, time.January, time.February:
		season, variant = "winter", "rain"
	case time.March, time.April:
		season, variant = "spring", "petals"
	case time.May:
		season, variant = "spring", "jacaranda"
	case time.June, time.July, time.August, time.September:
		season, variant = "summer", "motes"
	default: // Oct, Nov
		season, variant = "autumn", "leaves"
	}
	return Weather{Season: season, Variant: variant, Intensity: "heavy"}
}