fix: deliver validated AI insight responses

internal/analytics/service_test.go

@@ -1,6 +1,7 @@
 package analytics
 
 import (
+	"reflect"
 	"strings"
 	"testing"
 )
@@ -38,3 +39,61 @@ func TestPaymentHistoryQueryKeepsDatesForLongerPeriods(t *testing.T) {
 		t.Fatalf("paymentHistoryQuery(WEEK) capacity = %d, want 93", capacity)
 	}
 }
+
+func TestTransactionStatusDistributionUsesCanonicalOrderAndShares(t *testing.T) {
+	t.Parallel()
+
+	metrics := metricValues{total: 20, unverified: 3, verified: 12, failed: 4, reversed: 1}
+	got := transactionStatusDistribution(metrics)
+	want := []TransactionStatusDistribution{
+		{Status: "Paid", Count: 3, SharePercent: stringPointer("15.00")},
+		{Status: "Verified", Count: 12, SharePercent: stringPointer("60.00")},
+		{Status: "Failed", Count: 4, SharePercent: stringPointer("20.00")},
+		{Status: "Reversed", Count: 1, SharePercent: stringPointer("5.00")},
+	}
+
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("transactionStatusDistribution() = %#v, want %#v", got, want)
+	}
+}
+
+func TestTransactionStatusDistributionHasUnavailableSharesWithoutSessions(t *testing.T) {
+	t.Parallel()
+
+	for _, item := range transactionStatusDistribution(metricValues{}) {
+		if item.SharePercent != nil {
+			t.Fatalf("share for %s = %q, want nil", item.Status, *item.SharePercent)
+		}
+	}
+}
+
+func TestStatusTrendQueryUsesReportingGranularity(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name       string
+		periodType string
+		wantStep   string
+		wantBucket string
+		capacity   int
+	}{
+		{name: "day uses hours", periodType: "DAY", wantStep: "interval '1 hour'", wantBucket: "date_trunc('hour'", capacity: 24},
+		{name: "week uses days", periodType: "WEEK", wantStep: "interval '1 day'", wantBucket: "date_trunc('day'", capacity: 7},
+		{name: "month uses days", periodType: "JALALI_MONTH", wantStep: "interval '1 day'", wantBucket: "date_trunc('day'", capacity: 31},
+		{name: "season uses iranian weeks", periodType: "PERSIAN_SEASON", wantStep: "interval '7 days'", wantBucket: "interval '2 days'", capacity: 15},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			query, capacity := statusTrendQuery(tt.periodType)
+			if !strings.Contains(query, tt.wantStep) || !strings.Contains(query, tt.wantBucket) {
+				t.Fatalf("statusTrendQuery(%s) has unexpected granularity:\n%s", tt.periodType, query)
+			}
+			if capacity != tt.capacity {
+				t.Fatalf("statusTrendQuery(%s) capacity = %d, want %d", tt.periodType, capacity, tt.capacity)
+			}
+		})
+	}
+}
+
+func stringPointer(value string) *string { return &value }