package clientnotify

// chooseChannel decides which channel (if any) a notification should go
// out on for one client. Telegram, MAX, and VK are all free/rich and
// preferred over SMS whenever linked and not opted out — the fixed
// telegram > max > vk preference order (rather than e.g. most-recently-
// linked) purely keeps existing behavior unchanged for deployments that
// predate MAX/VK support, not because either is worse. SMS is a paid
// fallback, opt-in per client AND enabled globally (an owner might not have
// SMS.ru credentials configured at all).
func chooseChannel(tgChatID, maxChatID, vkChatID string, notifyTelegram, notifyMax, notifyVk, notifySMS, clientNotifyEnabled, smsEnabled bool) (string, bool) {
	if !clientNotifyEnabled {
		return "", false
	}
	if tgChatID != "" && notifyTelegram {
		return "telegram", true
	}
	if maxChatID != "" && notifyMax {
		return "max", true
	}
	if vkChatID != "" && notifyVk {
		return "vk", true
	}
	if notifySMS && smsEnabled {
		return "sms", true
	}
	return "", false
}

// dedupeKey ties a notification to the specific event that triggered it
// (an order_events.id, a warranty date, etc — see Event.DedupeSeed) plus
// the channel, so a retry of the same event never double-sends but the
// same trigger firing again later (order re-enters "ready" after being
// reopened) produces a new key and a new message.
func dedupeKey(trigger, seed, channel string) string {
	return trigger + ":" + seed + ":" + channel
}