package lua

// Plugin visibility: a plugin page is not automatically public data.
//
// The billing page renders GLOBAL cost across every source and the quota page
// renders upstream balances. Both were served to any authenticated key because
// /api/ui-inject applied no role filter — measured, not theorised: a user-role
// key pulled the 18KB billing state and read the source names and the $8.86
// total straight out of it.
//
// These tests pin the DENIALS. A visibility feature whose tests only assert that
// an admin still sees everything passes while the leak is wide open.

import (
	"testing"
)

func TestAudienceAllows(t *testing.T) {
	cases := []struct {
		want, role string
		ok         bool
		why        string
	}{
		{"", "user", true, "unset means everyone"},
		{"all", "user", true, "explicit all"},
		{"admin", "admin", true, "exact match"},
		{"admin", "user", false, "admin-only excludes user"},
		{"user", "user", true, "user-only admits user"},
		{"user", "admin", false, "user-only excludes admin"},
		{"admin,user", "user", true, "list admits a listed role"},
		{" admin , user ", "user", true, "whitespace is not significant"},
		{"ADMIN", "user", false, "case is normalised"},
		{"*", "user", false, `"*" must NOT be a synonym for all`},
	}
	for _, c := range cases {
		if got := audienceAllows(c.want, c.role); got != c.ok {
			t.Errorf("audienceAllows(%q, %q) = %v, want %v (%s)",
				c.want, c.role, got, c.ok, c.why)
		}
	}
}

func TestPluginVisibilityHidesPageFromUserRole(t *testing.T) {
	dir := t.TempDir()
	ps := NewPlugins(NewVM(dir), dir)

	// One admin-only plugin, one open plugin: the filter must drop exactly one
	// and leave the other intact, or a plugin author has no way to ship a mixed
	// set.
	const adminOnly = `
local P = {}
P.name = "adminonly"
P.version = "1.0.0"
P.exports = {}
P.ui = { visibility = "admin", page = { page_id = "secret", title = "Secret", mount = "<div>secret</div>" } }
return P
`
	const open = `
local P = {}
P.name = "openpage"
P.version = "1.0.0"
P.exports = {}
P.ui = { page = { page_id = "open", title = "Open", mount = "<div>open</div>" } }
return P
`
	for name, src := range map[string]string{"adminonly": adminOnly, "openpage": open} {
		if err := ps.LoadSource(name, src); err != nil {
			t.Fatalf("load %s: %v", name, err)
		}
	}

	admin := ps.UIForRole("admin")
	if len(admin.Pages) != 2 {
		t.Errorf("admin should see both pages, got %d", len(admin.Pages))
	}

	user := ps.UIForRole("user")
	for _, pg := range user.Pages {
		if pg.PageID == "secret" {
			t.Fatal("a user key can see the admin-only page — this is the leak")
		}
	}
	if len(user.Pages) != 1 || user.Pages[0].PageID != "open" {
		t.Fatalf("user should see exactly the open page, got %v", pageIDs(user.Pages))
	}
}

// The operator must be able to impose visibility the plugin did not choose —
// that is the whole point of the override, since a bundled .lua cannot be edited
// without being overwritten on the next upgrade.
func TestPluginVisibilityOverrideBeatsDeclaration(t *testing.T) {
	dir := t.TempDir()
	ps := NewPlugins(NewVM(dir), dir)
	const open = `
local P = {}
P.name = "openpage"
P.version = "1.0.0"
P.exports = {}
P.ui = { page = { page_id = "open", title = "Open", mount = "<div>open</div>" } }
return P
`
	if err := ps.LoadSource("openpage", open); err != nil {
		t.Fatal(err)
	}
	if len(ps.UIForRole("user").Pages) != 1 {
		t.Fatal("precondition: the page should start visible to user")
	}

	ps.SetPluginVisibility("openpage", "admin")
	if got := ps.UIForRole("user").Pages; len(got) != 0 {
		t.Fatalf("the operator override was ignored: user still sees %v", pageIDs(got))
	}
	if ps.VisibilityOverride("openpage") != "admin" {
		t.Error("the override should be reportable so /api/plugins can show it")
	}

	// Clearing restores the plugin's own declaration.
	ps.SetPluginVisibility("openpage", "")
	if got := ps.UIForRole("user").Pages; len(got) != 1 {
		t.Fatalf("clearing the override should restore visibility, got %v", pageIDs(got))
	}
}

// A page may narrow visibility below the plugin default, so one plugin can ship
// a public summary beside an admin-only detail page.
func TestPluginPageCanNarrowBelowPluginDefault(t *testing.T) {
	dir := t.TempDir()
	ps := NewPlugins(NewVM(dir), dir)
	const mixed = `
local P = {}
P.name = "mixed"
P.version = "1.0.0"
P.exports = {}
P.ui = {
  pages = {
    { page_id = "summary", title = "Summary", mount = "<div>s</div>" },
    { page_id = "details", title = "Details", mount = "<div>d</div>", audience = "admin" },
  },
}
return P
`
	if err := ps.LoadSource("mixed", mixed); err != nil {
		t.Fatal(err)
	}
	user := ps.UIForRole("user")
	if len(user.Pages) != 1 || user.Pages[0].PageID != "summary" {
		t.Fatalf("user should see only the summary, got %v", pageIDs(user.Pages))
	}
	if len(ps.UIForRole("admin").Pages) != 2 {
		t.Error("admin should see both pages")
	}
}

func TestPluginStateVisibleTo(t *testing.T) {
	dir := t.TempDir()
	ps := NewPlugins(NewVM(dir), dir)
	const adminOnly = `
local P = {}
P.name = "adminonly"
P.version = "1.0.0"
P.exports = {}
P.state = { secret = "x" }
P.ui = { visibility = "admin", page = { page_id = "s", title = "S", mount = "<div/>" } }
return P
`
	if err := ps.LoadSource("adminonly", adminOnly); err != nil {
		t.Fatal(err)
	}
	// The data has to follow the page: a hidden UI with an open state endpoint is
	// the same leak with one more step.
	if ps.StateVisibleTo("adminonly", "user") {
		t.Error("user must not read an admin-only plugin's state")
	}
	if !ps.StateVisibleTo("adminonly", "admin") {
		t.Error("admin must still read it")
	}
	// Unknown plugin: unchanged behaviour, so a widget that is not installed does
	// not start answering 403.
	if !ps.StateVisibleTo("nosuchplugin", "user") {
		t.Error("an unknown plugin name must not become forbidden; that would change " +
			"behaviour for plugins that simply are not installed")
	}
}

func pageIDs(pages []*UIPage) []string {
	out := make([]string, 0, len(pages))
	for _, p := range pages {
		if p != nil {
			out = append(out, p.PageID)
		}
	}
	return out
}