using System.Text.Json;

namespace VideoDownloader.Browser;

public sealed record NoteItem(string Id, string Title, string Body, DateTime CreatedAt);

/// <summary>T3-12: 노트 패널 저장소 — 마크다운 텍스트 노트 추가·검색·삭제, JSON 영속.</summary>
public sealed class NotesStore
{
    private readonly string _path;
    private readonly object _gate = new();
    private List<NoteItem> _items;

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

    public string Add(string title, string body)
    {
        var note = new NoteItem(Guid.NewGuid().ToString("N"), title, body, DateTime.Now);
        lock (_gate)
        {
            _items.Insert(0, note);
            try
            {
                Directory.CreateDirectory(Path.GetDirectoryName(_path)!);
                File.WriteAllText(_path, JsonSerializer.Serialize(_items));
            }
            catch { }
        }
        return note.Id;
    }

    public List<NoteItem> List()
    {
        lock (_gate) return _items.ToList();
    }

    public List<NoteItem> Search(string query)
    {
        var q = query?.Trim() ?? "";
        return List().Where(n => q.Length == 0 ||
            n.Title.Contains(q, StringComparison.OrdinalIgnoreCase) ||
            n.Body.Contains(q, StringComparison.OrdinalIgnoreCase)).ToList();
    }

    public void Delete(string id)
    {
        lock (_gate)
        {
            _items.RemoveAll(n => n.Id == id);
            try { File.WriteAllText(_path, JsonSerializer.Serialize(_items)); } catch { }
        }
    }

    /// <summary>UC-K19 명시적 저장(Ctrl+S) — 현재 목록을 파일에 다시 기록한다.</summary>
    public void Save()
    {
        lock (_gate)
        {
            try { File.WriteAllText(_path, JsonSerializer.Serialize(_items)); } catch { }
        }
    }
}