package web

import (
	"strings"
	"testing"
	"unicode/utf8"

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

// ── R-294 / R-202 — THE ORPHAN CARD STOPS PROMISING WHAT IT CANNOT KNOW ─────────────────────────
//
// The card told a customer, at the moment they had just lost their off-site history, that the old
// copies "may be restorable later with their recovery code". The discriminator is
// host_escrow_superseded.identity_blob and it lives on the HUB; the box caches only
// HubEscrowIdentityPresent, which describes the CURRENT escrow, and no report or ACK field carries
// superseded-blob retention. The renderer therefore could not evaluate the condition it stated.
//
// For everything set aside before hub v0.93.0 (in force 2026-08-04 ~11:11Z) the promise is false and
// unfixable, and on 2026-08-10 it was being made to a real machine in exactly that state.
//
// Implements documentation/design/SPEC-orphan-card-copy-2026-08-10.md §5. Render tests per branch of
// the gate, because a template gate without one is the seam-wiring lesson.

// orphanCardData renders the backups_remote page with the offbox repo in the given state. Only
// RepoState varies between the branches below, so what each test proves is attributable.
func orphanCardData(repoState string) map[string]interface{} {
	d := splitTestData()
	d["Offbox"] = &settings.OffboxTarget{
		Enabled: true, Host: "nas.local", User: "felhom", RepoPath: "/srv/repo",
		EscrowState: "escrowed", RepoState: repoState, QuotaGB: 50, StatsKnown: true,
	}
	d["OffboxQuotaPct"] = 0
	return d
}

// ── Branch 1: the card IS shown ─────────────────────────────────────────────────────────────────

// SPEC §5.1 — the regression guard. The promise must not return in any form.
//
// RED-PROOF: restore the old sentence („…és a hozzá tartozó helyreállítási kóddal később
// visszaállítható lehet.") in backups_remote.html and this fails on the first assertion, with the
// promise quoted back in the failure message.
func TestOrphanCard_DoesNotPromiseRestorability(t *testing.T) {
	html := renderBackupPage(t, "backups_remote", orphanCardData("orphaned"))

	if !strings.Contains(html, "offbox-orphan-card") {
		t.Fatal("the orphan card did not render at all — this test would then pass vacuously, " +
			"which is the way a copy guard silently stops guarding")
	}
	// R-299: the guard matches the STEM, not one inflection. The first version of this test asserted
	// „visszaállítható lehet" (singular) and the card carried „visszaállíthatók lehetnek" (plural) one
	// paragraph above it — the same claim, invisible to the guard. A guard matching one inflection of a
	// Hungarian verb guards one SENTENCE, not the claim. `visszaállíthat` is the potential stem
	// ("can be restored"); the plain forms the rest of the UI uses („visszaállítás", „visszaállítani")
	// do not contain it, so this does not over-match.
	//
	// It asserts on the RENDERED bytes, which is why the explanatory {{/* */}} comment in the template
	// may quote the retired wording: html/template strips it. An HTML <!-- --> comment would SHIP and
	// would make this test unfailable — that is the R-253 trap, and it is why the comment form matters.
	if idx := strings.Index(html, "visszaállíthat"); idx >= 0 {
		// Slice on RUNE boundaries. Go string indexing is by byte, and cutting Hungarian text at a
		// byte offset splits a multi-byte character — the failure message then shows a replacement
		// char and reads like an encoding bug in the product rather than in this message.
		start, end := idx-80, idx+90
		if start < 0 {
			start = 0
		}
		if end > len(html) {
			end = len(html)
		}
		for start < len(html) && !utf8.RuneStart(html[start]) {
			start++
		}
		for end < len(html) && !utf8.RuneStart(html[end]) {
			end++
		}
		t.Errorf("R-294/R-299: the card still promises the set-aside copies may be restorable. The box "+
			"cannot evaluate that — the discriminator (superseded identity_blob) is on the hub and no "+
			"wire field carries it — and for everything set aside before 2026-08-04 it is false.\n"+
			"  found: …%s…", html[start:end])
	}
}

// SPEC §5.2 — a refusal that names no route is a defect in this project. Pin the route, not only the
// absence of the promise.
//
// RED-PROOF: delete the „írj nekünk" sentence and this fails — the customer is told we cannot promise
// anything and given nowhere to go.
func TestOrphanCard_NamesARouteAfterDeclining(t *testing.T) {
	html := renderBackupPage(t, "backups_remote", orphanCardData("orphaned"))

	if !strings.Contains(html, "nem tudjuk megígérni") {
		t.Error("R-294: the card no longer DECLINES the claim — stating nothing is not the same as " +
			"saying plainly that we cannot promise it")
	}
	if !strings.Contains(html, "írj nekünk") {
		t.Error("R-294: the card declines the promise but names no route the customer can take")
	}
	// It must still say the copy is kept — otherwise "we cannot promise" reads as "it is gone".
	if !strings.Contains(html, "nem töröljük") {
		t.Error("R-294: the card no longer says the set-aside copy is kept; without that, declining " +
			"the promise reads to the customer as data loss")
	}
}

// The reason the card exists — the orphan EXPLANATION — is accurate and must survive the copy change.
func TestOrphanCard_KeepsTheExplanation(t *testing.T) {
	html := renderBackupPage(t, "backups_remote", orphanCardData("orphaned"))

	if !strings.Contains(html, "korábbi, már nem elérhető kulccsal") {
		t.Error("the explanation of WHY the store is orphaned was lost — the customer is then shown a " +
			"refusal with no cause")
	}
}

// ── Branch 2: the card is NOT shown ─────────────────────────────────────────────────────────────

// SPEC §5.3 — per branch of the gate. A healthy store must not see any of this copy: R-215's shape is
// a screen about a situation the customer is not in.
func TestOrphanCard_HealthyStoreSeesNoneOfIt(t *testing.T) {
	html := renderBackupPage(t, "backups_remote", orphanCardData("ok"))

	if strings.Contains(html, "offbox-orphan-card") {
		t.Fatal("the orphan card rendered for a healthy store")
	}
	for _, s := range []string{"nem tudjuk megígérni", "írj nekünk", "félretéve marad"} {
		if strings.Contains(html, s) {
			t.Errorf("orphan copy %q leaked onto a healthy box's page", s)
		}
	}
}

// R-299 — the EXPLANATION paragraph keeps its two accurate halves and drops the promise.
//
// This is the always-visible half of the card; the paragraph fixed yesterday only appears after the
// customer clicks through to the confirm block. So on first view this is the ONLY text they read,
// and until now it was the one still making the promise.
func TestOrphanCard_ExplanationKeepsWhatIsTrueAndDropsThePromise(t *testing.T) {
	html := renderBackupPage(t, "backups_remote", orphanCardData("orphaned"))

	// The two halves that ARE knowable from the box must survive.
	for _, keep := range []string{
		"nem elérhető kulccsal", // why the store is orphaned
		"nem írható a tárolóba", // the consequence right now
		"nem sérültek",          // the backups are intact — knowable, and reassuring for a reason
	} {
		if !strings.Contains(html, keep) {
			t.Errorf("R-299: the explanation lost an accurate statement (%q). Declining the promise must "+
				"not turn into telling the customer less than we know", keep)
		}
	}
	// …and the part the box cannot evaluate must be declined, with a route.
	if !strings.Contains(html, "nem tudja megállapítani") {
		t.Error("R-299: the explanation no longer says the machine cannot determine this — silence is " +
			"not the same as declining a claim")
	}
	if !strings.Contains(html, "írj nekünk") {
		t.Error("R-299: the explanation declines the claim but names no route")
	}
}