// Package main — weatherq.go holds the weather-query keyword helpers: does
// this utterance ask about weather at all, and which city (if any) did it
// name. Both are plain substring/lookup matching, not NLU — extend this file
// rather than voice.go for anything in that shape.
package main

import "strings"

// isWeatherQuery returns true if the utterance is about weather.
func isWeatherQuery(u string) bool {
	lower := strings.ToLower(u)
	return strings.Contains(lower, "погод") ||
		strings.Contains(lower, "градус") ||
		strings.Contains(lower, "температур") ||
		strings.Contains(lower, "дожд") ||
		strings.Contains(lower, "холод") ||
		strings.Contains(lower, "тепл") ||
		strings.Contains(lower, "weather") ||
		strings.Contains(lower, "temperature")
}

// weatherCities — the city names an utterance may name explicitly, as
// lowercase substrings mapped to the provider's spelling. This is a
// convenience for "какая погода в Лондоне", NOT a source of default truth:
// nothing here is used unless he actually said it.
var weatherCities = map[string]string{
	"москв":    "Moscow",
	"moscow":   "Moscow",
	"питер":    "Saint Petersburg",
	"spb":      "Saint Petersburg",
	"петербур": "Saint Petersburg",
	"лондон":   "London",
	"london":   "London",
	"париж":    "Paris",
	"paris":    "Paris",
	"берлин":   "Berlin",
	"berlin":   "Berlin",
	"нью-йорк": "New York",
	"new york": "New York",
}

// extractWeatherLocation returns the city he named, or the configured default
// when he named none. It returns "" when he named none AND no default is
// configured — the caller must then say it does not know.
//
// It used to return "Moscow" in that case. That is a made-up answer presented
// as fact: reading out Moscow's temperature to someone who is not in Moscow is
// wrong in exactly the way maven must never be wrong. voice.weather
// .default_location is the only source of an unstated location.
func extractWeatherLocation(u, defaultLoc string) string {
	lower := strings.ToLower(u)
	for substr, name := range weatherCities {
		if strings.Contains(lower, substr) {
			return name
		}
	}
	return defaultLoc
}