package web

import (
	"io"
	"log"
	"net/http/httptest"
	"path/filepath"
	"regexp"
	"sort"
	"strings"
	"testing"
	"time"

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

// R-48 — the offsite restore wizard.
//
// What these tests actually guard is the finding's RULE, not the page: two adjacent controls whose
// difference is "your data comes back" vs "your data cannot come back" must not be distinguishable
// only by layout. Scenario A is therefore asserted STRUCTURALLY (the mutation forms are absent from
// the list page and present only in the wizard), not by eyeballing copy.

// wizardData builds the wizard template's data map. Mirrors what backupsRestoreWizardHandler puts
// there — the handler's own construction is exercised separately by the redirect tests.
func wizardData(app string, view restoreWizardView, pair backup.OffsitePairInfo) map[string]interface{} {
	return map[string]interface{}{
		"Page": "backups-restore", "Title": "Visszaállítás",
		"Backup":         &backup.FullBackupStatus{},
		"App":            app,
		"AppDisplayName": strings.ToUpper(app[:1]) + app[1:],
		"AppSlug":        app,
		"Wizard":         view,
		"Pair":           pair,
		"FullPrepSize":   "1,2 GB",
		"RunningStack":   "",
	}
}

func renderWizard(t *testing.T, data map[string]interface{}) string {
	t.Helper()
	return renderBackupPage(t, "backups_restore_wizard", data)
}

// --- Group B (Scenario B): the step derivation is server truth, and PURE ---------------------------
//
// COMPANION RED-PROOF (run + recorded in REPORT.md): replace the body of deriveWizardStep with the
// trivial `return restoreWizardView{Step: wizStepIntent, VerifyEnabled: true}` — the op-running,
// prepare-confirm and scratch-ready rows all FAIL. Restore → green.
func TestDeriveWizardStep_Table(t *testing.T) {
	cases := []struct {
		name string
		in   restoreWizardInput
		want restoreWizardView
	}{
		{
			name: "no scratch, no op → intent; only verification is offered, full restore must be prepared first",
			in:   restoreWizardInput{App: "immich"},
			want: restoreWizardView{Step: wizStepIntent, Phase: wizPhasePrepare, VerifyEnabled: true, PrepareEnabled: true},
		},
		{
			name: "scratch ready → intent, and BOTH data-touching intents unlock; preparation is done",
			in:   restoreWizardInput{App: "immich", ScratchReady: true},
			want: restoreWizardView{Step: wizStepIntent, Phase: wizPhasePrepare, VerifyEnabled: true, PlaceEnabled: true, RestoreEnabled: true},
		},
		{
			name: "full_prep flash for THIS app → prepare-confirm; only the commit is offered",
			in:   restoreWizardInput{App: "immich", FullPrepApp: "immich"},
			want: restoreWizardView{Step: wizStepPrepareConfirm, Phase: wizPhaseConfirm, CommitPrepareEnabled: true},
		},
		{
			name: "full_prep flash for ANOTHER app → this app keeps its own intent step",
			in:   restoreWizardInput{App: "immich", FullPrepApp: "bookstack"},
			want: restoreWizardView{Step: wizStepIntent, Phase: wizPhasePrepare, VerifyEnabled: true, PrepareEnabled: true},
		},
		{
			name: "op running (this app) → execution; nothing offered",
			in:   restoreWizardInput{App: "immich", OpRunning: true},
			want: restoreWizardView{Step: wizStepExecution, Phase: wizPhaseExecute},
		},
		{
			name: "op running for ANOTHER app still suppresses THIS app (the single-flight is process-wide)",
			in:   restoreWizardInput{App: "immich", OpRunning: true, ScratchReady: true},
			want: restoreWizardView{Step: wizStepExecution, Phase: wizPhaseExecute},
		},
		{
			name: "a just-finished restore returns to intent, but the strip says Eredmény",
			in:   restoreWizardInput{App: "immich", ScratchReady: true, HasRecentResult: true},
			want: restoreWizardView{Step: wizStepIntent, Phase: wizPhaseResult, VerifyEnabled: true, PlaceEnabled: true, RestoreEnabled: true},
		},
		{
			name: "a running op outranks a recent result — Végrehajtás, not Eredmény",
			in:   restoreWizardInput{App: "immich", OpRunning: true, HasRecentResult: true},
			want: restoreWizardView{Step: wizStepExecution, Phase: wizPhaseExecute},
		},
		{
			name: "op running OUTRANKS a stale full_prep flash — no commit button mid-restore",
			in:   restoreWizardInput{App: "immich", OpRunning: true, FullPrepApp: "immich"},
			want: restoreWizardView{Step: wizStepExecution, Phase: wizPhaseExecute},
		},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got := deriveWizardStep(tc.in)
			if got != tc.want {
				t.Errorf("deriveWizardStep(%+v)\n got  %+v\n want %+v", tc.in, got, tc.want)
			}
		})
	}
}

// --- Group C (Scenario B error rows): refusals resolve, never 500 ----------------------------------

func TestResolveWizardApp_Refusals(t *testing.T) {
	rows := []OffboxAppRow{
		{Name: "immich", DisplayName: "Immich", Enabled: true},
		{Name: "radarr", DisplayName: "Radarr", Enabled: false},
	}
	if got := resolveWizardApp(rows, "immich"); got == nil || got.DisplayName != "Immich" {
		t.Fatalf("toggled app must resolve, got %+v", got)
	}
	if got := resolveWizardApp(rows, "radarr"); got != nil {
		t.Errorf("an app that is NOT toggled for offsite has no snapshot to restore from — want nil, got %+v", got)
	}
	if got := resolveWizardApp(rows, "does-not-exist"); got != nil {
		t.Errorf("unknown app must not resolve, got %+v", got)
	}
	if got := resolveWizardApp(nil, "immich"); got != nil {
		t.Errorf("empty set must not resolve, got %+v", got)
	}
}

// The customer-visible URL must redirect, not 500, when the offsite target is not configured at all.
func TestRestoreWizardHandler_UnconfiguredRedirects(t *testing.T) {
	s := testServer(t)
	rec := httptest.NewRecorder()
	req := httptest.NewRequest("GET", "/backups/restore/app?name=immich", nil)
	s.backupsRestoreWizardHandler(rec, req)
	if rec.Code != 302 {
		t.Fatalf("want 302 redirect, got %d", rec.Code)
	}
	loc := rec.Header().Get("Location")
	if !strings.HasPrefix(loc, "/backups/restore?flash_error=") {
		t.Errorf("must redirect to the list with an error flash, got %q", loc)
	}
}

// --- Group A + C (Scenarios A and C): one entry on the list, three described cards in the wizard ----

// Scenario A — the list page carries EXACTLY ONE restore control per app and ZERO offsite mutation
// forms. This is the finding itself: the five inline forms are gone from the row.
func TestRestoreList_SingleEntryPerApp(t *testing.T) {
	data := splitTestData()
	data["OffboxScratchReady"] = map[string]bool{"calibre-web": true}
	data["OffboxPairInfo"] = map[string]backup.OffsitePairInfo{
		"calibre-web": {Ready: true, HasDump: true, DumpsAt: time.Now().Add(-2 * time.Hour)},
	}
	html := renderBackupPage(t, "backups_restore", data)

	// The scratch-ready fixture is precisely the state in which the OLD page rendered place and
	// reconstitute as adjacent siblings. None of them may appear here now.
	for _, banned := range []string{
		`action="/backup/offbox/restore"`,
		`action="/backup/offbox/place"`,
		`action="/backup/offbox/reconstitute"`,
		"Helyreállítás az élő adatok közé",
		"Teljes visszaállítás (fájlok + adatbázis)",
		"Teljes visszaállítás előkészítése",
	} {
		if strings.Contains(html, banned) {
			t.Errorf("R-48 violated: the list page still renders %q", banned)
		}
	}
	if n := strings.Count(html, `href="/backups/restore/app?name=calibre-web"`); n != 1 {
		t.Errorf("want exactly ONE wizard entry for the app, got %d", n)
	}
}

// Scenario C — the three intents are CARDS with their own consequence sentence, the dangerous one is
// styled as such, and the honesty panel is bound to the real pair info.
func TestRestoreWizard_ThreeIntentCards(t *testing.T) {
	pair := backup.OffsitePairInfo{
		Ready: true, HasDump: true,
		DumpsAt: time.Date(2026, 7, 19, 3, 15, 0, 0, time.UTC),
		Skewed:  true, LooksEmpty: true,
	}
	view := deriveWizardStep(restoreWizardInput{App: "immich", ScratchReady: true})
	html := renderWizard(t, wizardData("immich", view, pair))

	// Each intent must state its CONSEQUENCE, not just its name.
	for _, want := range []string{
		"Ellenőrzés külön mappába",
		"az élő adataid nem változnak",
		"Hiányzó fájlok visszahozása",
		"törölt tartalom ettől nem jelenik meg újra",
		"Teljes visszaállítás (fájlok + adatbázis)",
		"az adatbázist is visszatölti",
	} {
		if !strings.Contains(html, want) {
			t.Errorf("intent card copy missing: %q", want)
		}
	}
	// The dangerous intent is marked structurally, not only by wording/position.
	if !strings.Contains(html, "restore-danger-card") {
		t.Error("the full-restore card must carry the danger styling hook")
	}
	// Pair honesty is BOUND to the fixture, not hardcoded prose.
	if !strings.Contains(html, "eltérő időpontból származnak") {
		t.Error("Skewed pair must surface the skew warning")
	}
	if !strings.Contains(html, "üresnek tűnik") {
		t.Error("LooksEmpty pair must surface the empty-dump warning")
	}
	if !strings.Contains(html, `data-restore-skewed="1"`) || !strings.Contains(html, `data-restore-empty="1"`) {
		t.Error("the double-confirm must receive the pair facts it repeats back")
	}
	// The confirm copy moved VERBATIM — it is the good part of the old surface.
	if !strings.Contains(html, "UTOLSÓ MEGERŐSÍTÉS") || !strings.Contains(html, "confirmFullRestore") {
		t.Error("the double-confirm did not move with the action")
	}
	// A pair WITHOUT the warnings must not inherit them (guards a hardcoded-prose regression).
	// NOTE: the confirm helper's JS repeats both sentences as string literals, so the assertion has
	// to be on the RENDERED markup — the warning banners and the data-attributes that drive them —
	// not on a bare substring, which is always present via the script block.
	clean := renderWizard(t, wizardData("immich", view, backup.OffsitePairInfo{Ready: true, HasDump: true}))
	// The two banners are identified by their opening markup, not by a bare substring: the layout's
	// shared confirm helper also contains alert-warning literals.
	const skewBanner = `alert alert-warning" style="margin-bottom:.75rem">Az adatbázis-mentés régebbi`
	const emptyBanner = `alert alert-warning" style="margin-bottom:.75rem">A mentett adatbázis üresnek tűnik`
	if !strings.Contains(html, skewBanner) || !strings.Contains(html, emptyBanner) {
		t.Error("a skewed + empty-looking pair must render BOTH warning banners")
	}
	if strings.Contains(clean, skewBanner) || strings.Contains(clean, emptyBanner) {
		t.Error("a clean pair must render neither warning banner")
	}
	if !strings.Contains(clean, `data-restore-skewed=""`) || !strings.Contains(clean, `data-restore-empty=""`) {
		t.Error("a clean pair must pass empty skew/empty flags to the confirm helper")
	}
}

// Without a prepared scratch the two data-touching intents are NOT offered — the card explains what
// has to happen first instead of showing a button that would fail.
func TestRestoreWizard_NoScratchLocksDataIntents(t *testing.T) {
	view := deriveWizardStep(restoreWizardInput{App: "immich"})
	html := renderWizard(t, wizardData("immich", view, backup.OffsitePairInfo{}))
	if strings.Contains(html, `action="/backup/offbox/place"`) {
		t.Error("missing-only merge must not be offered without a prepared scratch")
	}
	if strings.Contains(html, `action="/backup/offbox/reconstitute"`) {
		t.Error("full restore must not be offered without a prepared scratch")
	}
	if !strings.Contains(html, "Teljes visszaállítás előkészítése") {
		t.Error("the full-restore card must offer preparation instead")
	}
}

// --- Group E (Scenario B, execution row): every mutation form suppressed while an op runs ----------

func TestRestoreWizard_OpRunningSuppressesAllMutations(t *testing.T) {
	view := deriveWizardStep(restoreWizardInput{App: "immich", OpRunning: true, ScratchReady: true, FullPrepApp: "immich"})
	data := wizardData("immich", view, backup.OffsitePairInfo{Ready: true, HasDump: true})
	data["RunningStack"] = "bookstack"
	html := renderWizard(t, data)

	if strings.Contains(html, "<form") {
		t.Error("the execution step must render NO mutation form — the single-flight would refuse it")
	}
	if !strings.Contains(html, "bookstack") {
		t.Error("the execution card must name what is actually running")
	}
}

// --- Group D (Scenario D): real flows only — no new mutation surface ------------------------------

var formActionRe = regexp.MustCompile(`action="([^"]+)"`)

// Every form in every wizard state posts to a PRE-EXISTING endpoint. If this test has to be updated
// to add a path, a new mutation endpoint was introduced — which R-48 explicitly does not do.
func TestRestoreWizard_NoNewMutationEndpoints(t *testing.T) {
	preExisting := map[string]bool{
		"/backup/offbox/restore":      true,
		"/backup/offbox/place":        true,
		"/backup/offbox/reconstitute": true,
	}
	states := []restoreWizardInput{
		{App: "immich"},
		{App: "immich", ScratchReady: true},
		{App: "immich", FullPrepApp: "immich"},
		{App: "immich", OpRunning: true},
	}
	seen := map[string]bool{}
	for _, in := range states {
		html := renderWizard(t, wizardData(in.App, deriveWizardStep(in), backup.OffsitePairInfo{Ready: true, HasDump: true}))
		for _, m := range formActionRe.FindAllStringSubmatch(html, -1) {
			seen[m[1]] = true
			if !preExisting[m[1]] {
				t.Errorf("wizard posts to a NON-pre-existing endpoint %q — R-48 adds no mutation surface", m[1])
			}
		}
	}
	var got []string
	for p := range seen {
		got = append(got, p)
	}
	sort.Strings(got)
	if len(got) != 3 {
		t.Errorf("expected all three existing endpoints to be reachable across the states, got %v", got)
	}
}

// The field NAMES the wizard sends must match what the handlers read — a renamed field would make
// every action a silent no-op that still redirects with a success-shaped flash.
func TestRestoreWizard_FieldContract(t *testing.T) {
	// intent step, scratch ready: unit-verify + place + reconstitute(confirm=1)
	html := renderWizard(t, wizardData("immich",
		deriveWizardStep(restoreWizardInput{App: "immich", ScratchReady: true}),
		backup.OffsitePairInfo{Ready: true, HasDump: true}))
	for _, want := range []string{
		`<input type="hidden" name="app" value="immich">`,
		`<input type="hidden" name="mode" value="unit">`,
		`<input type="hidden" name="confirm" value="1">`,
	} {
		if !strings.Contains(html, want) {
			t.Errorf("field contract broken, missing: %s", want)
		}
	}
	// prepare-confirm step: mode=full AND confirm=1 together (the size-gated commit)
	confirmHTML := renderWizard(t, wizardData("immich",
		deriveWizardStep(restoreWizardInput{App: "immich", FullPrepApp: "immich"}),
		backup.OffsitePairInfo{}))
	if !strings.Contains(confirmHTML, `name="mode" value="full"`) || !strings.Contains(confirmHTML, `name="confirm" value="1"`) {
		t.Error("the size-gated commit must post mode=full together with confirm=1")
	}
	if !strings.Contains(confirmHTML, "1,2 GB") {
		t.Error("the confirm step must show the measured size before the customer commits")
	}
}

// --- The v0.154.0 escape: the handler read the WRONG "is something running" flag -----------------
//
// The Scenario-E table test above proves deriveWizardStep behaves correctly GIVEN OpRunning=true.
// Nothing proved the handler ever COMPUTES OpRunning=true — and it didn't, for the wizard's most-used
// action. `Manager` carries two booleans: `running` (concurrency, acquired inside the goroutine, and
// `RestoreOffboxScratch` never acquires it at all) and `opRunning` (display, set synchronously by
// `BeginRestoreOp`). v0.154.0 read the first via `IsRunning()`, so during a verification restore the
// page offered all three intents with live buttons while the progress banner on the same screen said
// the restore was in progress. Found by the operator on the first live click-through.
//
// COMPANION RED-PROOF (run + recorded in REPORT.md): point restoreOpInFlight at m.IsRunning() —
// this test FAILS with inFlight=false while a restore op is live.
func TestRestoreOpInFlight_UsesDisplayFlagNotConcurrencyFlag(t *testing.T) {
	tmp := t.TempDir()
	lg := log.New(io.Discard, "", 0)
	sett, err := settings.Load(filepath.Join(tmp, "settings.json"), lg)
	if err != nil {
		t.Fatal(err)
	}
	cfg := &config.Config{}
	cfg.Paths.DataDir = tmp
	m := backup.NewManager(cfg, sett, lg)

	if restoreOpInFlight(m.RestoreStatus()) {
		t.Fatal("idle manager must not report an op in flight")
	}

	// EXACTLY what offboxRestoreHandler does for a verification restore: mark the op, then launch.
	// RestoreOffboxScratch never acquires the concurrency flag, so IsRunning() stays false here —
	// which is precisely why reading it was wrong.
	m.BeginRestoreOp("offbox-restore", "immich")

	if m.IsRunning() {
		t.Fatal("precondition changed: BeginRestoreOp now sets the concurrency flag too — revisit this test")
	}
	if !restoreOpInFlight(m.RestoreStatus()) {
		t.Fatal("a started restore op MUST read as in-flight for display (this is the v0.154.0 bug)")
	}
	// …and the wizard must therefore suppress every mutation form.
	view := deriveWizardStep(restoreWizardInput{App: "immich", OpRunning: restoreOpInFlight(m.RestoreStatus()), ScratchReady: true})
	if view.Step != wizStepExecution {
		t.Fatalf("wizard must render the execution step during a restore, got %q", view.Step)
	}
	html := renderWizard(t, wizardData("immich", view, backup.OffsitePairInfo{Ready: true, HasDump: true}))
	if strings.Contains(html, "<form") {
		t.Error("no mutation form may render while a restore op is in flight")
	}

	m.EndRestoreOp(true, "kész")
	if restoreOpInFlight(m.RestoreStatus()) {
		t.Error("a finished op must clear the in-flight display state")
	}
}

// hasRecentRestoreResult decides whether „Eredmény" lights up. Two ways it could lie: showing a
// stale result forever (no bound), and showing ANOTHER app's result on this app's page (the op
// status is process-wide). Both are asserted here.
func TestHasRecentRestoreResult(t *testing.T) {
	now := time.Date(2026, 7, 21, 12, 0, 0, 0, time.UTC)
	res := func(stack string, ago time.Duration) *backup.RestoreOpResult {
		return &backup.RestoreOpResult{Op: "offbox-restore", Stack: stack, OK: true,
			Message: "kész", FinishedAt: now.Add(-ago)}
	}
	cases := []struct {
		name string
		st   backup.RestoreOpStatus
		app  string
		want bool
	}{
		{"just finished, this app", backup.RestoreOpStatus{Last: res("immich", time.Minute)}, "immich", true},
		{"finished long ago — the strip must not claim a fresh result",
			backup.RestoreOpStatus{Last: res("immich", 2*time.Hour)}, "immich", false},
		{"ANOTHER app's result must not light this app's page",
			backup.RestoreOpStatus{Last: res("bookstack", time.Minute)}, "immich", false},
		{"still running — Végrehajtás owns the strip, not Eredmény",
			backup.RestoreOpStatus{Running: true, Last: res("immich", time.Minute)}, "immich", false},
		{"no result at all", backup.RestoreOpStatus{}, "immich", false},
		{"zero FinishedAt is not a result", backup.RestoreOpStatus{
			Last: &backup.RestoreOpResult{Stack: "immich", OK: true}}, "immich", false},
		{"exactly at the window boundary is stale (half-open)",
			backup.RestoreOpStatus{Last: res("immich", restoreResultWindow)}, "immich", false},
		{"one tick inside the window is fresh",
			backup.RestoreOpStatus{Last: res("immich", restoreResultWindow-time.Second)}, "immich", true},
		{"a clock skew into the future must not count as recent",
			backup.RestoreOpStatus{Last: res("immich", -time.Minute)}, "immich", false},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := hasRecentRestoreResult(tc.st, tc.app, now); got != tc.want {
				t.Errorf("hasRecentRestoreResult = %v, want %v", got, tc.want)
			}
		})
	}
}

// The result card renders the outcome and is bound to the real result — and a FAILED restore must
// not borrow the success styling.
func TestRestoreWizard_ResultCard(t *testing.T) {
	view := deriveWizardStep(restoreWizardInput{App: "immich", ScratchReady: true, HasRecentResult: true})
	data := wizardData("immich", view, backup.OffsitePairInfo{Ready: true, HasDump: true})
	data["LastResult"] = &backup.RestoreOpResult{
		Op: "offbox-restore", Stack: "immich", OK: true,
		Message:    "A(z) immich visszaállítva ellenőrző mappába: /mnt/felhom-drives/hdd_1/backups/offsite-restore/immich",
		FinishedAt: time.Date(2026, 7, 21, 9, 12, 0, 0, time.UTC),
	}
	html := renderWizard(t, data)
	if !strings.Contains(html, "offsite-restore/immich") {
		t.Error("the result card must show the real outcome message, naming where the copy landed")
	}
	if !strings.Contains(html, "alert alert-info") {
		t.Error("a successful result must render in the neutral/info tone")
	}

	data["LastResult"] = &backup.RestoreOpResult{Op: "offbox-restore", Stack: "immich", OK: false,
		Message: "A visszaállítás sikertelen: nincs elég hely", FinishedAt: time.Date(2026, 7, 21, 9, 12, 0, 0, time.UTC)}
	fail := renderWizard(t, data)
	if !strings.Contains(fail, "alert alert-error") {
		t.Error("a FAILED restore must render in the error tone, not the success one")
	}
	if strings.Contains(fail, `alert alert-info">A visszaállítás sikertelen`) {
		t.Error("failure message rendered with success styling")
	}

	// No recent result -> no card at all.
	plain := renderWizard(t, wizardData("immich",
		deriveWizardStep(restoreWizardInput{App: "immich", ScratchReady: true}),
		backup.OffsitePairInfo{Ready: true, HasDump: true}))
	if strings.Contains(plain, "<h3>Eredmény</h3>") {
		t.Error("no result card may render without a recent result")
	}
}