status updated

models/storeopen.go

@@ -0,0 +1,89 @@
+package models
+
+import (
+	"strings"
+	"time"
+)
+
+/*
+Is a branch taking orders right now?
+
+Two things have to be true: the branch exists as far as the platform is
+concerned, and the shop has not closed itself for the day. They are different
+questions with different owners — Nearle decommissions a branch, a shopkeeper
+closes for an afternoon — and this is the only place they are answered
+together.
+
+── Reopening is worked out, not scheduled ──────────────────────────────────
+
+A shop that said "back on Monday" is open on Monday because this function says
+so, not because a job ran. Nothing has to fire, nothing can be missed, and a
+server that was down over the weekend still gets it right. The alternative — a
+nightly task flipping the flag — fails silently exactly once and leaves a shop
+shut with nobody watching.
+
+── Why the date means the day it REOPENS ───────────────────────────────────
+
+"Closed until the 12th" reads, in English, as open on the 12th. So the date
+names the first day back, and a shop closing for today alone sets tomorrow.
+The console says "Reopens on" rather than "Closed until" so nobody has to
+work that out.
+*/
+func StoreIsOpen(status string, isOpen bool, closedUntil string, now time.Time) bool {
+	// Decommissioned beats everything. A branch Nearle has switched off does
+	// not come back because a date passed.
+	if !strings.EqualFold(strings.TrimSpace(status), "active") {
+		return false
+	}
+
+	if isOpen {
+		return true
+	}
+
+	// Closed, with a date to come back on.
+	reopen, ok := parseStoreDate(closedUntil)
+	if !ok {
+		// Closed with no end in sight — a power cut nobody can put a date on.
+		// Stays closed until a person says otherwise, which is the safe way
+		// round: a shop wrongly shown open takes orders it cannot fill.
+		return false
+	}
+
+	today := now.Truncate(24 * time.Hour)
+	return !today.Before(reopen.Truncate(24 * time.Hour))
+}
+
+/*
+Why a shopper cannot order, in words fit to show them.
+
+Empty when the branch is open. Returned straight to the app, so it says what a
+person needs to know and not what the database holds.
+*/
+func StoreClosedReason(status string, isOpen bool, closedUntil string, now time.Time) string {
+	if StoreIsOpen(status, isOpen, closedUntil, now) {
+		return ""
+	}
+	if !strings.EqualFold(strings.TrimSpace(status), "active") {
+		return "This store is not currently available"
+	}
+	if reopen, ok := parseStoreDate(closedUntil); ok {
+		return "This store is closed today and reopens on " + reopen.Format("2 Jan")
+	}
+	return "This store is closed today"
+}
+
+// Accepts a bare date or a timestamp, because the column is a DATE but GORM
+// and the console have both been known to hand over a full RFC3339 string.
+// Anything unreadable is "no date", never today.
+func parseStoreDate(value string) (time.Time, bool) {
+	trimmed := strings.TrimSpace(value)
+	if trimmed == "" {
+		return time.Time{}, false
+	}
+	if len(trimmed) >= 10 {
+		if parsed, err := time.Parse("2006-01-02", trimmed[:10]); err == nil {
+			return parsed, true
+		}
+	}
+	return time.Time{}, false
+}