package backup

import (
	"fmt"
	"io"
	"log"
	"strings"
	"testing"
	"time"
)

// v0.263.0 — a hold after a FAILED UNDO opens with what was tried and what state the data is in, in the
// box's language; a hold with no undo attempted reads exactly as before (every pre-v0.263.0 hold).
//
// COMPANION RED-PROOF (REPORT.md): make RestoreHoldFor ignore h.UndoState (drop undoHoldPrefix) — the
// three undo cases then read the plain sentence and this test fails on the prefix.
func TestUndo_HoldSentenceSaysTheUndoWasTriedAndTheDataState(t *testing.T) {
	at := time.Date(2026, 9, 23, 8, 0, 0, 0, time.UTC)
	copyAt := time.Date(2026, 9, 23, 1, 30, 0, 0, time.UTC)
	m := r479Manager(t, false)
	m.logger = log.New(io.Discard, "", 0)
	plain := fmt.Sprintf(UpdateHoldTierFmt, "app", "2026-09-23 10:00", "második meghajtó", "2026-09-23 03:30")

	if err := m.HoldAfterFailedUpdateHolding("app", at, copyAt, UpdateTierSecondDrive, "", ""); err != nil {
		t.Fatal(err)
	}
	if _, why := m.RestoreHoldFor("app"); why != plain {
		t.Errorf("no undo attempted: the sentence must be unchanged, got %q", why)
	}

	for state, clause := range map[string]string{
		"untouched":   "Az adatok az új változat által hagyott állapotban vannak.",
		"half":        "Az adatok visszamásolása félbeszakadt",
		"not_started": "Az adatok a frissítés előtti állapotba kerültek vissza, de az előző változat nem indult el.",
	} {
		if err := m.HoldAfterFailedUpdateHolding("app", at, copyAt, UpdateTierSecondDrive, "", state); err != nil {
			t.Fatal(err)
		}
		_, why := m.RestoreHoldFor("app")
		if !strings.HasPrefix(why, "A frissítés nem sikerült, és az automatikus visszaállítás sem. "+clause) {
			t.Errorf("%s: the hold must open with the undo prefix and its state, got %q", state, why)
		}
		if !strings.HasSuffix(why, plain) {
			t.Errorf("%s: the hold must still name the copy to restore from, got %q", state, why)
		}
	}

	if err := m.settings.SetLanguage("en"); err != nil {
		t.Fatal(err)
	}
	_, why := m.RestoreHoldFor("app")
	if !strings.HasPrefix(why, "The update did not succeed, and the automatic undo did not either. The data is back as it was before the update") {
		t.Errorf("an English box gets the English prefix, got %q", why)
	}
	if strings.Contains(why, "automatikus visszaállítás") {
		t.Errorf("the Hungarian prefix must be GONE on an English box, got %q", why)
	}
}