using System.IO;
using System.Text.Json;

namespace VideoDownloader.App.Browser.Tabs;

/// <summary>세션 JSON 저장소(T1-10). 종료 시 탭 URL 저장, 시작 시 복원.</summary>
public static class TabSessionStore
{
    public static void Save(string path, SessionSnapshot snap)
    {
        try
        {
            var dir = Path.GetDirectoryName(path);
            if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);
            var tmp = path + ".tmp";
            File.WriteAllText(tmp, JsonSerializer.Serialize(snap));
            File.Move(tmp, path, overwrite: true);
        }
        catch { }
    }

    public static SessionSnapshot? Load(string path)
    {
        try
        {
            if (!File.Exists(path)) return null;
            var snap = JsonSerializer.Deserialize<SessionSnapshot>(File.ReadAllText(path));
            if (snap == null || snap.Urls == null || snap.Urls.Count == 0) return null;
            var pinned = snap.Pinned ?? new List<bool>();
            while (pinned.Count < snap.Urls.Count) pinned.Add(false);
            return snap with { Pinned = pinned };
        }
        catch
        {
            return null;
        }
    }
}