package app

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

func TestFindLatestVrchatLogKeepsEmptyNewestFile(t *testing.T) {
	base := t.TempDir()
	userProfile := filepath.Join(base, "profile")
	logDir := filepath.Join(userProfile, "AppData", "LocalLow", "VRChat", "VRChat")
	if err := os.MkdirAll(logDir, 0o755); err != nil {
		t.Fatalf("mkdir log dir: %v", err)
	}
	t.Setenv("USERPROFILE", userProfile)

	oldPath := filepath.Join(logDir, "output_log_2026-06-29_20-46-23.txt")
	newPath := filepath.Join(logDir, "output_log_2026-06-30_22-25-51.txt")
	if err := os.WriteFile(oldPath, []byte("old"), 0o644); err != nil {
		t.Fatalf("write old log: %v", err)
	}
	if err := os.WriteFile(newPath, nil, 0o644); err != nil {
		t.Fatalf("write new log: %v", err)
	}
	oldTime := time.Date(2026, 6, 30, 22, 25, 52, 0, time.Local)
	newTime := time.Date(2026, 6, 30, 22, 26, 0, 0, time.Local)
	if err := os.Chtimes(oldPath, oldTime, oldTime); err != nil {
		t.Fatalf("chtimes old log: %v", err)
	}
	if err := os.Chtimes(newPath, newTime, newTime); err != nil {
		t.Fatalf("chtimes new log: %v", err)
	}

	got, err := findLatestVrchatLog()
	if err != nil {
		t.Fatalf("find latest log: %v", err)
	}
	if got != newPath {
		t.Fatalf("expected newest empty log, got %q want %q", got, newPath)
	}
}