package backup

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"gitea.dooplex.hu/admin/felhom-controller/internal/settings"
)

// R-477 — the update's Tier-3 lookup is ONE snapshots call. The control proves the fake runner does
// see stats calls when something makes them (the inventory page), so a zero is a measurement.
//
// COMPANION RED-PROOF (REPORT.md): make OffsiteSnapshotTimes read OffsiteInventoryList — this fails.
func TestR477_TheUpdateOffsiteLookupRunsNoStats(t *testing.T) {
	m, _ := newOffboxManager(t)
	var calls []string
	m.SetOffboxRunner(func(_ context.Context, _ []string, args ...string) ([]byte, error) {
		calls = append(calls, strings.Join(args, " "))
		if contains(args, "snapshots") {
			return []byte(`[{"short_id":"a1","time":"2026-09-13T01:00:00Z","tags":["gokapi"]},{"short_id":"b2","time":"2026-09-13T02:00:00Z","tags":["kimai"]}]`), nil
		}
		return []byte(`{"total_size":1024,"total_file_count":1}`), nil
	})
	m.updateTier2PointFn, m.updateTier1PointsFn = noTier2, noTier1
	count := func(word string) int {
		n := 0
		for _, c := range calls {
			if strings.Contains(" "+c+" ", " "+word+" ") {
				n++
			}
		}
		return n
	}
	p, ok, _ := m.UpdateRestorePoints(context.Background(), "gokapi", nil)
	if !ok || p.Tier != UpdateTierOffsite || !p.At.Equal(time.Date(2026, 9, 13, 1, 0, 0, 0, time.UTC)) {
		t.Fatalf("want gokapi's off-site snapshot; got %+v ok=%v", p, ok)
	}
	if count("snapshots") != 1 || count("stats") != 0 {
		t.Errorf("the update lookup must be one snapshots call and no stats; calls=%v", calls)
	}
	calls = nil
	if _, err := m.OffsiteInventoryList(context.Background()); err != nil {
		t.Fatal(err)
	}
	if count("stats") == 0 {
		t.Fatalf("control: the inventory DOES run stats, so the fake must see them; calls=%v", calls)
	}
}

// R-474 — only the app's own Tier-2 mirror is found and removed.
func TestR474_OnlyTheAppsOwnMirrorIsRemoved(t *testing.T) {
	m, sett := newOffboxManager(t)
	drive := t.TempDir()
	if err := sett.AddStoragePath(settings.StoragePath{Path: drive, Label: "HDD", Schedulable: true}); err != nil {
		t.Fatal(err)
	}
	root := NamespaceRootFor(drive, m.systemDataPath)
	sec := filepath.Join(root, "backups", "secondary")
	mine, other, shares := filepath.Join(sec, "gokapi"), filepath.Join(sec, "kimai"), filepath.Join(sec, SharesPseudoStack)
	for _, d := range []string{mine, other, shares} {
		if err := os.MkdirAll(filepath.Join(d, "recovery-unit"), 0o755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(filepath.Join(d, "recovery-unit", "manifest.json"), []byte("{}"), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	dirs := m.Tier2MirrorDirsForApp("gokapi")
	if len(dirs) != 1 || dirs[0] != mine {
		t.Fatalf("mirror dirs for gokapi = %v, want [%s]", dirs, mine)
	}
	removed := m.RemoveTier2Mirrors("gokapi", append(dirs, other, shares, filepath.Join(sec, "gokapi", "..", "kimai")))
	if len(removed) != 1 {
		t.Errorf("exactly the app's own mirror must be removed, got %v", removed)
	}
	if _, err := os.Stat(mine); !os.IsNotExist(err) {
		t.Error("gokapi's mirror must be gone")
	}
	for _, keep := range []string{other, shares} {
		if _, err := os.Stat(keep); err != nil {
			t.Errorf("%s must survive: %v", keep, err)
		}
	}
	if m.Tier2MirrorDirsForApp("../kimai") != nil || m.RemoveTier2Mirrors(SharesPseudoStack, []string{shares}) != nil {
		t.Error("an unsafe or shares name must find and remove nothing")
	}
}

func TestR474_DeleteAppBackupPrefsForgetsOnlyThatApp(t *testing.T) {
	_, sett := newOffboxManager(t)
	_ = sett.SetAppOffbox("gokapi", true)
	_ = sett.SetCrossDriveConfig("gokapi", &settings.CrossDriveBackup{DestinationPath: "/mnt/x"})
	_ = sett.SetAppOffbox("kimai", true)
	if err := sett.DeleteAppBackupPrefs("gokapi"); err != nil {
		t.Fatal(err)
	}
	if sett.IsAppOffbox("gokapi") || sett.GetCrossDriveConfig("gokapi") != nil {
		t.Error("gokapi's prefs must be forgotten")
	}
	if !sett.IsAppOffbox("kimai") {
		t.Error("another app's prefs must stay")
	}
	if err := sett.DeleteAppBackupPrefs("never-there"); err != nil {
		t.Errorf("deleting absent prefs is a no-op, got %v", err)
	}
}