using System.Text.Json;

namespace VideoDownloader.Browser;

public sealed record ArchivedTab(string Title, string Url, DateTime ClosedAt);

/// <summary>T3-2: 탭 아카이브 — 닫힘 이력 영속(최대 500, 같은 URL 연속은 제목 갱신), 검색·복구 지원.</summary>
public sealed class TabArchive
{
    private const int Cap = 500;
    private readonly string _path;
    private readonly object _gate = new();
    private List<ArchivedTab> _items;

    public TabArchive(string path)
    {
        _path = path;
        try
        {
            if (File.Exists(path))
                _items = JsonSerializer.Deserialize<List<ArchivedTab>>(File.ReadAllText(path)) ?? new();
        }
        catch { }
        _items ??= new List<ArchivedTab>();
    }

    public void Add(string title, string url)
    {
        if (string.IsNullOrWhiteSpace(url)) return;
        lock (_gate)
        {
            _items.RemoveAll(t => t.Url.Equals(url, StringComparison.OrdinalIgnoreCase));
            _items.Insert(0, new ArchivedTab(title, url, DateTime.Now));
            if (_items.Count > Cap) _items.RemoveRange(Cap, _items.Count - Cap);
            try
            {
                Directory.CreateDirectory(Path.GetDirectoryName(_path)!);
                File.WriteAllText(_path, JsonSerializer.Serialize(_items));
            }
            catch { }
        }
    }

    public List<ArchivedTab> Search(string query)
    {
        lock (_gate)
        {
            var q = query?.Trim() ?? "";
            return _items.Where(t => q.Length == 0 ||
                t.Title.Contains(q, StringComparison.OrdinalIgnoreCase) ||
                t.Url.Contains(q, StringComparison.OrdinalIgnoreCase)).ToList();
        }
    }

    public void Remove(string url)
    {
        lock (_gate)
        {
            _items.RemoveAll(t => t.Url.Equals(url, StringComparison.OrdinalIgnoreCase));
            try { File.WriteAllText(_path, JsonSerializer.Serialize(_items)); } catch { }
        }
    }
}