package backup

import (
	"testing"
	"time"
)

// R-351 — A FINISHED RESTORE MUST BE VISIBLE TO SOMEONE WHO WAS NOT WATCHING.
//
// THE MEASURED CASE (demo-hp, 2026-08-21). An off-box reconstitution refused at 16:37:14, the person
// reinstalled and ran the local unit restore, and it completed at 16:39:25 — in 8.666s. No screen
// ever said so. The banner's JS gated its terminal result on a page-local `sawRunning` flag, so the
// result was rendered only for a browser that happened to be open and polling across the transition.
// Land on the page a moment later and the banner stayed hidden: "completed" and "never ran" looked
// identical. The answer existed only in `docker logs felhom-controller`, which a customer cannot
// reach.
//
// This pins the CONSEQUENCE — the status carries a recency verdict a late arrival can act on — not
// the mechanism. Mutating LastRecent to stay false must fail this test.
func TestRestoreStatus_LastRecent(t *testing.T) {
	for _, tc := range []struct {
		name       string
		finishedAt time.Time
		wantRecent bool
		why        string
	}{
		{
			name:       "just finished",
			finishedAt: time.Now().Add(-9 * time.Second),
			wantRecent: true,
			why:        "the 8.7s OpenGist restore: finished before a poll could see it running",
		},
		{
			name:       "inside the window",
			finishedAt: time.Now().Add(-RestoreResultWindow + time.Minute),
			wantRecent: true,
			why:        "still answers \"what just happened\"",
		},
		{
			name:       "outside the window",
			finishedAt: time.Now().Add(-RestoreResultWindow - time.Minute),
			wantRecent: false,
			why:        "landing here later must not claim a restore just finished",
		},
		{
			name:       "unstamped result",
			finishedAt: time.Time{},
			wantRecent: false,
			why:        "a zero timestamp is an UNKNOWN and must never be drawn as \"just now\" (presence is not success)",
		},
	} {
		t.Run(tc.name, func(t *testing.T) {
			m := &Manager{}
			m.opLast = &RestoreOpResult{
				Op: "restore", Stack: "opengist", OK: true,
				Message: "Restore completed", FinishedAt: tc.finishedAt,
			}
			st := m.RestoreStatus()
			if st.Last == nil {
				t.Fatal("fixture: the status must carry the terminal result")
			}
			if st.LastRecent != tc.wantRecent {
				t.Errorf("LastRecent = %v, want %v — %s", st.LastRecent, tc.wantRecent, tc.why)
			}
		})
	}
}

// A RUNNING op must not be reported as a recent RESULT — the banner shows one or the other, and
// conflating them would put a success message over an operation that is still writing.
func TestRestoreStatus_RunningIsNotAResult(t *testing.T) {
	m := &Manager{}
	m.BeginRestoreOp("offbox-reconstitute", "opengist")
	st := m.RestoreStatus()
	if !st.Running {
		t.Fatal("fixture: the op must be reported running")
	}
	if st.Last != nil {
		t.Errorf("a fresh op has no terminal result yet, got %+v", st.Last)
	}
	if st.LastRecent {
		t.Error("a running op must never carry a recent-result verdict")
	}
}