package app

import (
	"os"
	"path/filepath"
	"testing"
	"time"

	"vrc_osc_go/internal/common"
)

func TestGuestTrackerJoinLeave(t *testing.T) {
	base := t.TempDir()
	prev := common.SetRootDirForTest(func() string { return base })
	defer prev()

	tracker := NewGuestTracker([]string{"Alice", "Bob"})
	now := time.Date(2026, 6, 25, 12, 0, 0, 0, time.Local)

	tracker.MarkJoin("Alice", now)
	tracker.MarkJoin("Bob", now.Add(10*time.Second))

	got := tracker.Snapshot(now.Add(20 * time.Second))
	if len(got) != 2 {
		t.Fatalf("expected 2 guests, got %d", len(got))
	}

	present := 0
	for _, g := range got {
		if g.Present {
			present++
		}
	}
	if present != 2 {
		t.Fatalf("expected 2 present guests, got %#v", got)
	}

	tracker.MarkLeave("Alice", now.Add(30*time.Second))
	got = tracker.Snapshot(now.Add(40 * time.Second))

	var alice GuestStatus
	for _, g := range got {
		if g.Name == "Alice" {
			alice = g
		}
	}
	if alice.Present {
		t.Fatalf("expected Alice to be absent, got %#v", alice)
	}
	if alice.AbsentFor == "" {
		t.Fatalf("expected Alice absent duration, got %#v", alice)
	}

	snapshotPath := filepath.Join(base, "runtime", "guest_snapshot.json")
	if _, err := os.Stat(snapshotPath); err != nil {
		t.Fatalf("expected snapshot file: %v", err)
	}
}