package gateway

import (
	"strings"
	"testing"
)

// Per-key AUTO chain UI contract.
//
// The per-key editor deliberately REUSES the global lane canvas instead of
// shipping a second, simpler editor. That is a design choice with teeth: a
// reduced copy would lack drag ordering and per-slot quota/period/hours, and
// the two would drift apart silently. These checks pin the sharing, because
// the only symptom of un-sharing is "the per-key editor got worse" — no error,
// just a smaller feature set that nobody notices until they use it.
func TestUIPerKeyAutoWiring(t *testing.T) {
	src := uiSource(t)

	// The admin key list must offer the editor, otherwise the whole feature is
	// unreachable from the UI. Assert the *call site* inside keyCanvasHtml,
	// not just that the functions exist: removing the button leaves every
	// definition intact, and that is exactly the regression to catch.
	kcStart := strings.Index(src, "function keyCanvasHtml")
	if kcStart < 0 {
		t.Fatal("keyCanvasHtml is gone — cannot check the AUTO chain button")
	}
	kcEnd := strings.Index(src[kcStart:], "\n      }")
	if kcEnd < 0 {
		t.Fatal("could not delimit keyCanvasHtml")
	}
	if !strings.Contains(src[kcStart:kcStart+kcEnd], "openKeyAutoModal(") {
		t.Fatal("per-key AUTO chain button is missing from the key card header")
	}
	for _, fn := range []string{
		"function openKeyAutoModal",
		"function keyAutoInherit",
		"function keyAutoSave",
		"function keyAutoClose",
	} {
		if !strings.Contains(src, fn) {
			t.Fatalf("UI is missing %s — the editor cannot function", fn)
		}
	}
}

// The per-key editor must render the SAME canvas the global editor uses.
// If this regresses, the per-key chain silently loses drag ordering and
// per-slot quota/period/hours while still looking like it works.
func TestUIPerKeyAutoReusesGlobalCanvas(t *testing.T) {
	src := uiSource(t)

	// One canvas implementation, two mount ids.
	if !strings.Contains(src, "function renderSortEditor(") {
		t.Fatal("no shared canvas renderer — the per-key editor must reuse renderSortEditor")
	}
	if !strings.Contains(src, `canvasId: "scr-canvas"`) {
		t.Fatal("the global editor no longer mounts the shared canvas")
	}
	if !strings.Contains(src, `canvasId: "key-auto-canvas"`) {
		t.Fatal("the per-key editor does not mount the shared canvas")
	}
	// Canvas lookup must consider both ids, or drag/drop silently no-ops on
	// whichever surface is not #scr-canvas.
	if !strings.Contains(src, "function sortCanvasEl(") ||
		!strings.Contains(src, `getElementById("key-auto-canvas")`) {
		t.Fatal("sortCanvasEl must resolve both canvas ids")
	}
	// The rules<->lanes conversion is shared too, so the per-key editor sends
	// exactly the fields the server understands (quota/period/hours included).
	for _, fn := range []string{"function buildLanes(", "function lanesToRules("} {
		if !strings.Contains(src, fn) {
			t.Fatalf("%s must be shared between the global and per-key editors", fn)
		}
	}
}

// Saving must route through persistAuto's scope switch, not a hand-rolled
// request, or the two editors will serialize rules differently.
func TestUIPerKeyAutoSavesThroughScope(t *testing.T) {
	src := uiSource(t)
	if !strings.Contains(src, "sortState.scope = key") {
		t.Fatal("openKeyAutoModal must set sortState.scope so the save targets the key")
	}
	if !strings.Contains(src, "sortState.scope = null") {
		t.Fatal("closing the modal must clear sortState.scope, or the GLOBAL editor would save to this key")
	}
	if !strings.Contains(src, "if (sortState.scope)") {
		t.Fatal("persistAuto must branch on sortState.scope")
	}
	if !strings.Contains(src, `"/auto"`) {
		t.Fatal("per-key editor must call the /api/keys/{key}/auto endpoint")
	}
	// An empty lane list is how "inherit the global chain" is expressed.
	if !strings.Contains(src, "JSON.stringify({ auto: lanesToRules(sortState.lanes) })") {
		t.Fatal("keyAutoSave must PUT lanesToRules(sortState.lanes) verbatim")
	}
}

// Both languages need the strings, otherwise a non-Chinese admin sees raw
// i18n keys in the modal.
func TestUIPerKeyAutoHasBothLanguages(t *testing.T) {
	src := uiSource(t)
	for _, k := range []string{
		"kAutoChainTitle", "kAutoChainHint", "kAutoChainInherit",
		"kAutoChainEmpty", "kAutoChainGlobal", "kAutoChainBad",
	} {
		n := strings.Count(src, k+`: "`)
		if n < 2 {
			t.Fatalf("i18n key %s defined %d time(s), want both zh and en", k, n)
		}
	}
}

// The statistics dashboard must print the window it actually covers. Calendar
// periods are not nested — "this week" starts on its Monday and therefore
// reaches into the previous month early in a month, making its total LARGER
// than "this month". That is correct arithmetic, but without the dates on
// screen it reads as a bug, and it has been reported as one.
func TestUIStatsShowsPeriodWindow(t *testing.T) {
	src := uiSource(t)
	if !strings.Contains(src, `id="period-range"`) {
		t.Fatal("the stats dashboard has no element for the period window range")
	}
	if n := strings.Count(src, "periodRange"); n < 2 {
		t.Fatalf("i18n key periodRange appears %d time(s), want both zh and en", n)
	}
}
// Both canvases can exist in the DOM at once: the modal is mounted on top of
// the settings tab, whose #scr-canvas stays alive behind it. Resolving the
// canvas by document order (whichever comes first) painted the per-key chain
// into the hidden background tab and left the dialog empty — and worse,
// overwrote the global chain the user returns to. The lookup must follow
// sortState.scope instead.
func TestUISortCanvasResolvesByScope(t *testing.T) {
	src := uiSource(t)
	el := readFuncBody(t, src, "sortCanvasEl")
	if !strings.Contains(el, "if (sortState.scope)") {
		t.Fatal("sortCanvasEl must branch on sortState.scope, not document order")
	}
	if strings.Contains(el, `getElementById("scr-canvas")`) &&
		strings.Index(el, `getElementById("scr-canvas")`) < strings.Index(el, "sortState.scope") {
		t.Fatal("sortCanvasEl returns #scr-canvas before checking scope — the " +
			"per-key editor paints into the global canvas")
	}
}

// A successful save must close the dialog even when the slots do not resolve.
// The write DID succeed; leaving the modal open makes the user click Save
// again and again. This regressed once: the !slots branch returned early.
func TestUIKeyAutoSaveClosesOnSuccess(t *testing.T) {
	src := uiSource(t)
	body := readFuncBody(t, src, "keyAutoSave")
	// keyAutoClose() must be reached on every success path, not only in the
	// happy branch.
	iClose := strings.Index(body, "keyAutoClose()")
	if iClose < 0 {
		t.Fatal("keyAutoSave never calls keyAutoClose — the dialog would stay open")
	}
	iToast := strings.Index(body, "toast(")
	if iToast >= 0 && iClose < iToast {
		t.Fatal("keyAutoClose is called before the toast; the warning must be " +
			"shown first or it is lost with the modal")
	}
	// An early `return` inside a branch bypasses keyAutoClose entirely, so
	// merely finding the call is not enough: every `return` that sits between
	// entering the try block and the close call is a path that leaves the
	// dialog open after a successful write.
	tryStart := strings.Index(body, "try {")
	seg := body[tryStart:iClose]
	for _, line := range strings.Split(seg, "\n") {
		trimmed := strings.TrimSpace(line)
		if trimmed == "return;" || strings.HasPrefix(trimmed, "return ") {
			t.Fatal("a `return` before keyAutoClose leaves the dialog open after " +
				"a successful save: " + trimmed)
		}
	}
}

// readFuncBody returns the source of a top-level function by name, using
// brace matching so nested blocks do not truncate it.
func readFuncBody(t *testing.T, src, name string) string {
	t.Helper()
	idx := strings.Index(src, "function "+name+"(")
	if idx < 0 {
		t.Fatalf("function %s not found", name)
	}
	start := strings.Index(src[idx:], "{")
	if start < 0 {
		t.Fatalf("function %s has no body", name)
	}
	i := idx + start
	depth := 0
	for j := i; j < len(src); j++ {
		switch src[j] {
		case '{':
			depth++
		case '}':
			depth--
			if depth == 0 {
				return src[i : j+1]
			}
		}
	}
	t.Fatalf("function %s body is unterminated", name)
	return ""
}

// The per-key dialog must not share the app-wide #modal-wrap id.
//
// Every dialog in this file uses that id, and more than one can be open at
// once (the "add slot" picker opens ON TOP of this one). Handlers resolve
// their own dialog via `.closest()` from their button, which works — but this
// dialog is also looked up from the CANVAS side (sortCanvasEl, keyAutoClose,
// keyAutoInherit), where there is no button to walk up from.
// getElementById("#modal-wrap") then returns whichever dialog comes first in
// the document, i.e. not the one being edited: Cancel closed the wrong box and
// the canvas could resolve to the picker's.
func TestUIKeyAutoModalHasOwnID(t *testing.T) {
	src := uiSource(t)
	body := readFuncBody(t, src, "openKeyAutoModal")
	if !strings.Contains(body, `wrap.id = "key-auto-modal"`) {
		t.Fatal("openKeyAutoModal must give its dialog its own id, not the shared " +
			"#modal-wrap (another dialog may be open on top of it)")
	}
	close := readFuncBody(t, src, "keyAutoClose")
	if strings.Contains(close, `"modal-wrap"`) {
		t.Fatal("keyAutoClose resolves the shared #modal-wrap; it would close " +
			"whichever dialog comes first in the document")
	}
	if !strings.Contains(close, `"key-auto-modal"`) {
		t.Fatal("keyAutoClose must resolve the per-key dialog by its own id")
	}
}

// Editing a chain inside the per-key dialog must NOT persist it. That dialog
// has Save and Cancel, so auto-writing on add/drag/delete meant the change was
// already committed before Save and Cancel could not undo it.
//
// The global page is the opposite: it has always applied edits immediately.
func TestUIKeyAutoEditsDoNotAutoPersist(t *testing.T) {
	src := uiSource(t)
	body := readFuncBody(t, src, "afterChainEdit")
	if !strings.Contains(body, "if (sortState.scope)") {
		t.Fatal("afterChainEdit must branch on sortState.scope")
	}
	// The scoped branch must return before reaching persistAuto.
	iScope := strings.Index(body, "if (sortState.scope)")
	iReturn := strings.Index(body[iScope:], "return")
	iPersist := strings.Index(body, "persistAuto()")
	if iScope < 0 || iReturn < 0 || iPersist < 0 {
		t.Fatal("afterChainEdit no longer has the expected shape")
	}
	if iScope+iReturn > iPersist {
		t.Fatal("the scoped branch reaches persistAuto() — a per-key edit would " +
			"be written before Save")
	}
	// And it must not call itself (a regex-driven rewrite did exactly that).
	if strings.Contains(body, "afterChainEdit()") {
		t.Fatal("afterChainEdit calls itself: infinite recursion")
	}
	// Every in-canvas edit goes through it, so none of them bypass the check.
	for _, fn := range []string{"scrAddFromForm", "sortScopeSave", "scrDelSlot"} {
		b := readFuncBody(t, src, fn)
		if strings.Contains(b, "persistAuto()") {
			t.Fatalf("%s calls persistAuto() directly, bypassing afterChainEdit", fn)
		}
	}
}

// The stats range line formats its end date from the LAST bucket label.
// Bucket labels are hourly for the day view ("2026-10-03T09") and daily for
// week/month ("2026-10-01"), so blindly appending "T00:00:00Z" to the hourly
// form builds "2026-10-03T09T00:00:00Z" — Date rejects it, toISOString()
// throws, and the assignment is lost. The symptom is an empty range line on
// exactly the view people look at most, with no error anywhere.
func TestUIStatsPeriodRangeHandlesHourlyBuckets(t *testing.T) {
	src := uiSource(t)
	el := readFuncBody(t, src, "paintStats")
	// It must branch on the label shape instead of concatenating blindly.
	if !strings.Contains(el, `T\d{2}$`) && !strings.Contains(el, `\d{2}-\d{2}T\d{2}`) {
		t.Fatal("paintStats must recognise the hourly bucket label shape " +
			"(YYYY-MM-DDTHH); concatenating a time onto it yields an invalid Date")
	}
	// And it must not contain the naive form that broke it.
	if strings.Contains(el, `bucket + "T00:00:00Z"`) {
		t.Fatal("paintStats still appends T00:00:00Z to the bucket label — " +
			"this throws on the day view and leaves the range line empty")
	}
}

// A key with no chain of its own must open on a COPY OF THE GLOBAL CHAIN, not
// on an empty canvas. The realistic admin task is "this user gets the global chain
// minus the sources they must not hit"; starting blank forces retyping every
// tier against a 226-model picker. This is deliberately NOT the discovery
// fallback (which dumps every model of every source) — it is the same rules
// the global chain actually runs.
func TestUIKeyAutoSeedsFromGlobalChain(t *testing.T) {
	src := uiSource(t)
	body := readFuncBody(t, src, "openKeyAutoModal")
	if !strings.Contains(body, `api("/api/auto")`) {
		t.Fatal("openKeyAutoModal must read the global chain to seed the editor")
	}
	if !strings.Contains(body, "seededFromGlobal") {
		t.Fatal("the editor must remember whether its content came from the " +
			"global chain, so the notice can say so")
	}
	// And it must not fall back to the discovery path that fills 226 models.
	if strings.Contains(body, `buildLanes(idx, [], `) {
		t.Fatal("seeding from an empty rule list triggers buildLanes discovery")
	}
}

// The notice must distinguish "already this key's chain" from "a copy that
// only becomes its chain on Save" — those two look identical on the canvas and
// behave very differently if the admin hits Cancel.
func TestUIKeyAutoNoticeDistinguishesSavedFromCopied(t *testing.T) {
	src := uiSource(t)
	body := readFuncBody(t, src, "keyAutoInheritNotice")
	for _, k := range []string{"kAutoChainSeeded", "kAutoChainNewOwn", "kAutoChainWillInherit"} {
		if !strings.Contains(body, k) {
			t.Fatalf("the notice never uses %s — a copied chain and a saved one "+
				"would look the same", k)
		}
	}
	// Both languages, or a non-Chinese admin sees raw keys.
	for _, k := range []string{"kAutoChainSeeded", "kAutoChainNewOwn", "kAutoChainWillInherit"} {
		if n := strings.Count(src, k+`: "`); n < 2 {
			t.Fatalf("i18n key %s defined %d time(s), want both zh and en", k, n)
		}
	}
}