package yookassa

// Shops is a set of YooKassa merchant shops keyed by channel — the subtype of the trusted X-Platform
// signal for the direct rail ("web", "android"; "ios" later). The direct rail routes a payment to the
// per-channel shop for separate merchant accounts, accounting and receipts, while every shop still
// credits the one direct wallet (docs/PAYMENTS_DECISIONS_ru.md D42). An empty set leaves the direct
// order and notification endpoints unregistered.
type Shops map[string]Config

// Channel constants name the direct-rail X-Platform subtypes a shop is keyed by. ChannelWeb is the
// default: an unknown or empty channel routes here on the order side.
const (
	ChannelWeb     = "web"
	ChannelAndroid = "android"
)

// Shop returns the shop that issues an order for channel, falling back to the web shop when channel
// is unknown, empty or not configured. The fallback is safe: routing only chooses the merchant
// account and receipt, never the credited wallet (always direct, D42), so a mis-attributed channel
// costs at most accounting accuracy, not money. The second result is false when neither the channel
// nor the web shop is configured.
func (s Shops) Shop(channel string) (Config, bool) {
	if channel != "" {
		if c, ok := s[channel]; ok && c.Configured() {
			return c, true
		}
	}
	if c, ok := s[ChannelWeb]; ok && c.Configured() {
		return c, true
	}
	return Config{}, false
}

// ByShopID returns the shop with the given YooKassa shop id, which is how an incoming notification is
// attributed to one of several configured shops (the payment object reports it as
// recipient.account_id). Unlike Shop it does not fall back: an unrecognised shop id means the
// notification was not meant for us, and the caller must not guess at credentials.
func (s Shops) ByShopID(shopID string) (channel string, cfg Config, ok bool) {
	if shopID == "" {
		return "", Config{}, false
	}
	for ch, c := range s {
		if c.Configured() && c.ShopID == shopID {
			return ch, c, true
		}
	}
	return "", Config{}, false
}

// Configured reports whether at least one shop has credentials (the YooKassa direct rail is live).
func (s Shops) Configured() bool {
	for _, c := range s {
		if c.Configured() {
			return true
		}
	}
	return false
}