package hub

import (
	"context"
	"testing"
	"time"
)

// AdmittedCount is the drive surface's one window into a live room
// (spec §8.2): how many peers are actually in the call, and never who
// they are. A room nobody has opened is zero rather than an error —
// the caller holds a meeting row, and a meeting with no room is simply
// a meeting nobody has entered.
func TestAdmittedCountCountsAdmittedOnlyAndNeverAWaitingGuest(t *testing.T) {
	now := time.Date(2026, 9, 11, 9, 0, 0, 0, time.UTC)
	h := testHub(&now)
	ctx := context.Background()

	if n := h.AdmittedCount("r1"); n != 0 {
		t.Fatalf("a room nobody has opened: %d, want 0", n)
	}

	m, err := h.Open("r1", "sm", 1, "Mia", KindMember)
	if err != nil {
		t.Fatal(err)
	}
	if n := h.AdmittedCount("r1"); n != 0 {
		t.Fatalf("an unjoined participation counts: %d, want 0", n)
	}
	if err := h.Join(ctx, "r1", "sm", m.Peer); err != nil {
		t.Fatal(err)
	}
	if n := h.AdmittedCount("r1"); n != 1 {
		t.Fatalf("a joined member: %d, want 1", n)
	}

	g, err := h.Open("r1", "sg", 100, "Gus", KindGuest)
	if err != nil {
		t.Fatal(err)
	}
	if err := h.Join(ctx, "r1", "sg", g.Peer); err != nil {
		t.Fatal(err)
	}
	if n := h.AdmittedCount("r1"); n != 1 {
		t.Fatalf("a waiting guest is counted: %d, want 1", n)
	}

	if err := h.Admit(ctx, "r1", "sm", m.Peer, g.Peer); err != nil {
		t.Fatal(err)
	}
	if n := h.AdmittedCount("r1"); n != 2 {
		t.Fatalf("after admitting the guest: %d, want 2", n)
	}
	if n := h.AdmittedCount("r2"); n != 0 {
		t.Fatalf("another room's count leaked: %d, want 0", n)
	}

	if err := h.Leave("r1", "sg", g.Peer); err != nil {
		t.Fatal(err)
	}
	if n := h.AdmittedCount("r1"); n != 1 {
		t.Fatalf("after the guest left: %d, want 1", n)
	}
}