using System.Text.Json;
using LehrerApp.Core.Models;

namespace LehrerApp.Api;

public class ReadableSnapshotStore(string dataPath)
{
    private readonly string _path = Path.Combine(dataPath, "readable");
    private static readonly JsonSerializerOptions _opts = new() { WriteIndented = false, PropertyNamingPolicy = JsonNamingPolicy.CamelCase };

    public void Store(string userId, ReadableSnapshot snap)
    {
        Directory.CreateDirectory(_path);
        File.WriteAllText(FilePath(userId), JsonSerializer.Serialize(snap, _opts));
    }
    public ReadableSnapshot? Load(string userId)
    {
        var p = FilePath(userId);
        return File.Exists(p) ? JsonSerializer.Deserialize<ReadableSnapshot>(File.ReadAllText(p), _opts) : null;
    }
    private string FilePath(string userId) =>
        Path.Combine(_path, $"{string.Concat(userId.Where(c => char.IsLetterOrDigit(c) || c == '-'))}.json");
}