package backup

import (
	"errors"
	"os"
	"strings"
	"testing"
	"time"

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

// R-553 — the off-site failure classifier must keep telling a quota over-run apart after the sentence
// is translated. It used to look for the Hungarian word „tárhelykeretet" inside the error; slice 2
// translates that sentence, and the customer would then be told the copy failed „ismeretlen okból"
// — unknown cause — for the one failure with a clear, actionable cause.
//
// RED-PROOF (REPORT): put `case strings.Contains(s, "tárhelykeretet")` back and delete the
// errors.Is arm → the translated row falls to OffsiteFailUnknown and this fails.
func TestR553_OffsiteQuota_DecisionSurvivesWordingChange(t *testing.T) {
	cases := []struct {
		name string
		err  error
		want OffsiteFailureClass
	}{
		{"quota refusal, Hungarian as shipped", util.KindErrorf(ErrOffsiteQuota,
			"A távoli mentés túllépte a tárhelykeretet (%d/%d GB) — törölj régi mentéseket vagy kérj nagyobb keretet.", 51, 50), OffsiteFailQuota},
		{"quota refusal, TRANSLATED", util.KindErrorf(ErrOffsiteQuota,
			"The remote backup is over its storage quota (%d/%d GB) — delete old backups or ask for more space.", 51, 50), OffsiteFailQuota},
		{"quota refusal wrapped by a caller", util.KindErrorf(ErrOffsiteQuota, "over quota"), OffsiteFailQuota},
		// Negative controls: output we do NOT write stays matched by its text, on purpose.
		{"restic: no repository", errors.New("Fatal: unable to open config file: Stat: file does not exist"), OffsiteFailNoRepo},
		{"ssh: unreachable", errors.New("dial tcp 10.0.0.9:22: connect: connection refused"), OffsiteFailTransport},
		{"nothing to copy", errors.New("off-box backup produced no snapshots: 2 app(s) toggled"), OffsiteFailNoUnits},
		{"unknown stays unknown", errors.New("something else entirely"), OffsiteFailUnknown},
		{"no error", nil, ""},
	}
	for _, c := range cases {
		if got := ClassifyOffsiteFailure(c.err); got != c.want {
			t.Errorf("%s: ClassifyOffsiteFailure = %q, want %q", c.name, got, c.want)
		}
	}
}

// The consequence, not only the mechanism: the head line the customer reads on /backups/remote is the
// quota one for a TRANSLATED quota error. (offsiteFailureMessage is the only caller of the classifier.)
func TestR553_OffsiteQuota_HeadLineSurvivesWordingChange(t *testing.T) {
	tgt := &settings.OffboxTarget{Host: "nas.local", User: "felhom", RepoPath: "/srv/repo"}
	translated := util.KindErrorf(ErrOffsiteQuota, "The remote backup is over its storage quota (51/50 GB).")
	msg := offsiteFailureMessage(tgt, translated, 12*time.Second, "hu")
	if !strings.HasPrefix(msg, "A távoli mentés nem fért el a tárhelykereten belül") {
		t.Errorf("a translated quota failure is reported with the wrong cause line: %q", msg)
	}
	unknown := errors.New("The remote backup is over its storage quota (51/50 GB).")
	if m := offsiteFailureMessage(tgt, unknown, time.Second, "hu"); strings.HasPrefix(m, "A távoli mentés nem fért el") {
		t.Errorf("an error WITHOUT the kind must not be guessed into the quota class from its words: %q", m)
	}
}

// The producer keeps its Hungarian sentence byte-for-byte while carrying the kind.
func TestR553_QuotaProducerKeepsItsWords(t *testing.T) {
	err := util.KindErrorf(ErrOffsiteQuota,
		"A távoli mentés túllépte a tárhelykeretet (%d/%d GB) — törölj régi mentéseket vagy kérj nagyobb keretet.", 51, 50)
	want := "A távoli mentés túllépte a tárhelykeretet (51/50 GB) — törölj régi mentéseket vagy kérj nagyobb keretet."
	if err.Error() != want {
		t.Errorf("message CHANGED:\n got %q\nwant %q", err.Error(), want)
	}
	if !errors.Is(err, ErrOffsiteQuota) {
		t.Error("the quota refusal carries no kind")
	}
}

// The zero-selection run must RECORD its kind beside the sentence, or the page falls back to reading
// the words for ever. A real off-site run needs restic and an SSH target, so this is pinned at the
// source — the defect it guards is a producer written the old way, and the display half is covered by
// TestR553_StaleNoteDecisionSurvivesWordingChange in internal/web.
func TestR553_OffboxRunRecordsTheKind(t *testing.T) {
	src, err := os.ReadFile("offbox.go")
	if err != nil {
		t.Fatal(err)
	}
	body := string(src)
	i := strings.Index(body, `warns = append(warns, "Sikeres — nincs mentésre jelölt alkalmazás")`)
	if i < 0 {
		t.Fatal("the zero-selection sentence is gone from the run — this test no longer reads what it thinks it reads")
	}
	if !strings.Contains(body[i:i+400], "warnKind = OffboxWarnNoAppsSelected") {
		t.Error("the zero-selection run records its sentence but not its KIND — the Távoli mentés page " +
			"is left reading Hungarian words, which localisation slice 2 will change (R-553)")
	}
	if !strings.Contains(body, "o.LastWarningKind = warnKind") {
		t.Error("the recorded kind is never persisted, so the page sees nothing after a restart")
	}
	for _, clear := range []string{`o.LastWarning = ""
			o.LastWarningKind = ""`} {
		if !strings.Contains(body, clear) {
			t.Error("a run that clears LastWarning must clear its kind too, or a stale kind outlives its text")
		}
	}
}