package web

import (
	"strings"
	"testing"
	"time"

	"gitea.dooplex.hu/admin/felhom-hub/internal/monitor"
)

// R-277(b): a small but non-empty off-site repo must not render as "0.0 GB" on the Offsite page — that
// reading is how a healthy tier was reported to the operator as absent.
func TestOffsiteRow_SmallRepoNotZeroGB(t *testing.T) {
	s, st := newRenderServer(t)
	s.SetOffsiteBox(func() (monitor.BoxSnapshot, bool) {
		return monitor.BoxSnapshot{CapacityBytes: 1 << 40, FillBand: "ok", OversubBand: "ok", FetchedAt: time.Now().UTC()}, true
	})
	saveCfg(t, st, "tiny", `{"offsite":{"enabled":true,"type":"shared","quota_gb":500}}`)
	if err := st.SaveReport("tiny", []byte(`{"customer_id":"tiny","offsite":{"enabled":true,"repo_size_bytes":165888}}`)); err != nil {
		t.Fatal(err)
	}
	rows := s.offsiteCustomerRows()
	if len(rows) != 1 {
		t.Fatalf("want 1 row, got %d", len(rows))
	}
	if rows[0].UsageStr == "0.0 GB" || rows[0].UsageStr != "162.0 KB" {
		t.Fatalf("162 KB repo rendered as %q, want \"162.0 KB\"", rows[0].UsageStr)
	}
	body := renderOffsite(t, s)
	if !strings.Contains(body, "162.0 KB") {
		t.Fatal("Offsite page must show the small repo's real size")
	}
	// Above 1 GB the unit stays GB (same as the quota column).
	if got := fmtBytesAuto(200 * gib); got != "200.0 GB" {
		t.Fatalf("200 GiB = %q, want 200.0 GB", got)
	}
}

// R-92: two PBS DR polls 50 MB apart read identically at 0.1 GB granularity; the page must show a value
// that differs between them, so a small delta (a prune, a GC) is verifiable from the hub.
func TestPBSDRPanel_ExactBytesShowsSmallDelta(t *testing.T) {
	render := func(used int64) string {
		s, _ := newRenderServer(t)
		s.SetPBSDRBox(func() (monitor.PBSBoxSnapshot, bool) {
			return monitor.PBSBoxSnapshot{
				CapacityBytes: 40 * gib, UsedBytes: used, FillPercent: 20, FillBand: "ok",
				State: monitor.PBSStateOK, FetchedAt: time.Now().UTC(),
			}, true
		})
		return pbsSection(renderOffsite(t, s))
	}
	a := render(8 * gib)
	b := render(8*gib + 50_000_000)
	if !strings.Contains(a, "8 589 934 592 bytes") {
		t.Fatalf("PBS DR panel must show exact bytes:\n%s", a)
	}
	if !strings.Contains(b, "8 639 934 592 bytes") {
		t.Fatalf("PBS DR panel must show the +50 MB exact value:\n%s", b)
	}
	if fmtBytesExact(999) != "999 bytes" || fmtBytesExact(1000) != "1 000 bytes" {
		t.Fatalf("grouping wrong: %q %q", fmtBytesExact(999), fmtBytesExact(1000))
	}
}