package adminconsole

import (
	"bytes"
	"html/template"
	"io/fs"
	"strings"
	"testing"
)

// TestRendererRendersEveryPage parses the embedded templates and renders each
// page with a representative view, asserting the page executes, carries the
// shared layout chrome and shows a distinctive value.
func TestRendererRendersEveryPage(t *testing.T) {
	r, err := NewRenderer()
	if err != nil {
		t.Fatalf("new renderer: %v", err)
	}
	cases := []struct {
		page string
		data any
		want string
	}{
		{"dashboard", DashboardView{Accounts: 3, Variants: []VariantVersions{{Variant: "scrabble_en", Latest: "v1", Versions: []string{"v1"}}}}, "Dashboard"},
		{"users", UsersView{Items: []UserRow{{ID: "a1", DisplayName: "Kaya", FlaggedHighRate: true}}, Pager: NewPager(1, 50, 1)}, "high-rate"},
		{"user_detail", UserDetailView{ID: "a1", DisplayName: "Kaya", HasStats: true, Stats: StatsRow{Wins: 2}, TelegramID: "123", ConnectorEnabled: true}, "Send Telegram message"},
		{"user_detail", UserDetailView{ID: "a1", DisplayName: "Kaya", FlaggedHighRateAt: "2026-06-10 12:00"}, "Clear high-rate flag"},
		{"throttled", ThrottledView{
			Episodes:      []ThrottleEpisodeRow{{Class: "user", Key: "a1", UserID: "a1", Rejected: 1234, FirstSeen: "2026-06-10 12:00", LastSeen: "2026-06-10 12:05"}},
			Flagged:       []FlaggedAccountRow{{ID: "a1", DisplayName: "Kaya", FlaggedAt: "2026-06-10 12:05"}},
			FlagThreshold: 1000, FlagWindow: "10m0s",
		}, "Recent episodes"},
		{"games", GamesView{Items: []GameRow{{ID: "g1", Variant: "scrabble_en", Status: "active"}}, Status: "active", Pager: NewPager(1, 50, 1)}, "g1"},
		{"games", GamesView{Items: []GameRow{{ID: "g-open", Variant: "scrabble_en", Status: "open"}}, Status: "open", Pager: NewPager(1, 50, 1)}, "?status=open"},
		{"game_detail", GameDetailView{ID: "g1", Variant: "scrabble_en", Seats: []SeatRow{{Seat: 0, DisplayName: "Kaya"}}}, "Seats"},
		{"complaints", ComplaintsView{Items: []ComplaintRow{{ID: "c1", Word: "qi", Status: "open"}}, Status: "open", Pager: NewPager(1, 50, 1)}, "qi"},
		{"messages", MessagesView{Items: []MessageRow{{ID: "m1", SenderID: "a1", SenderName: "Kaya", Source: "telegram", Body: "good luck", GameID: "g1"}}, Pager: NewPager(1, 50, 1)}, "good luck"},
		{"complaint_detail", ComplaintDetailView{ID: "c1", Word: "qi", Variant: "scrabble_en"}, "Resolve"},
		{"dictionary", DictionaryView{Variants: []VariantVersions{{Variant: "scrabble_en", Latest: "v1", Versions: []string{"v1"}}}, Changes: []DictChangeRow{{Variant: "scrabble_en", Word: "qi", Action: "add"}}}, "Hot-reload"},
		{"broadcast", BroadcastView{ConnectorEnabled: true}, "Post to the game channel"},
		{"message", MessageView{Heading: "Done", Body: "ok", Back: "/_gm/"}, "Done"},
	}
	for _, tc := range cases {
		t.Run(tc.page, func(t *testing.T) {
			var buf bytes.Buffer
			if err := r.Render(&buf, tc.page, PageData{Title: tc.page, Data: tc.data}); err != nil {
				t.Fatalf("render %s: %v", tc.page, err)
			}
			out := buf.String()
			if !strings.Contains(out, tc.want) {
				t.Errorf("render %s: missing %q in output", tc.page, tc.want)
			}
			if !strings.Contains(out, "Scrabble · admin") {
				t.Errorf("render %s: missing layout chrome", tc.page)
			}
		})
	}
}

// TestPagerLinksPreserveFilterQuery guards the paginated lists whose links carry a
// pre-encoded filter query (url.Values.Encode) past the page number. The query fragment
// must reach the link verbatim: the contextual escaper would otherwise re-encode its
// structural "=" and "&" (turning "kind=robots" into the broken "kind%3drobots"), dropping
// the active filter on every page step. FilterQuery is typed template.URL to prevent that.
func TestPagerLinksPreserveFilterQuery(t *testing.T) {
	r := MustNewRenderer()

	t.Run("users", func(t *testing.T) {
		var buf bytes.Buffer
		view := UsersView{Robots: true, FilterQuery: template.URL("kind=robots"), Pager: NewPager(2, 50, 200)}
		if err := r.Render(&buf, "users", PageData{Title: "Users", Data: view}); err != nil {
			t.Fatalf("render users: %v", err)
		}
		out := buf.String()
		for _, want := range []string{
			`href="/_gm/users?kind=robots&page=1"`,
			`href="/_gm/users?kind=robots&page=3"`,
		} {
			if !strings.Contains(out, want) {
				t.Errorf("users pager: missing %q in:\n%s", want, out)
			}
		}
		if strings.Contains(out, "kind%3drobots") {
			t.Error("users pager: filter query was double-encoded (kind%3drobots)")
		}
	})

	t.Run("messages", func(t *testing.T) {
		var buf bytes.Buffer
		view := MessagesView{FilterQuery: template.URL("game=abc&user=def"), Pager: NewPager(2, 50, 200)}
		if err := r.Render(&buf, "messages", PageData{Title: "Messages", Data: view}); err != nil {
			t.Fatalf("render messages: %v", err)
		}
		out := buf.String()
		for _, want := range []string{
			`href="/_gm/messages.csv?game=abc&user=def"`,
			`href="/_gm/messages?game=abc&user=def&page=1"`,
			`href="/_gm/messages?game=abc&user=def&page=3"`,
		} {
			if !strings.Contains(out, want) {
				t.Errorf("messages pager: missing %q in:\n%s", want, out)
			}
		}
		if strings.Contains(out, "%3d") || strings.Contains(out, "%26") {
			t.Error("messages pager: filter query was double-encoded (%3d / %26)")
		}
	})
}

// TestRendererUnknownPage reports an error for a page that does not exist.
func TestRendererUnknownPage(t *testing.T) {
	r := MustNewRenderer()
	if err := r.Render(&bytes.Buffer{}, "nope", PageData{}); err == nil {
		t.Fatal("expected an error rendering an unknown page")
	}
}

// TestAssets confirms the stylesheet is embedded and reachable under the assets
// root.
func TestAssets(t *testing.T) {
	fsys, err := Assets()
	if err != nil {
		t.Fatalf("assets: %v", err)
	}
	if _, err := fs.Stat(fsys, "console.css"); err != nil {
		t.Errorf("console.css not embedded: %v", err)
	}
}