using ActivityPub.Controllers;
using ActivityPub.Utils;
using Microsoft.AspNetCore.Mvc;
using KristofferStrube.ActivityStreams;

namespace ActivityPub;

public class ObjectStore {
  private static Dictionary<string, Dictionary<string, KristofferStrube.ActivityStreams.Object>> _objects = new();
  private IUrlHelper Url { get; set; }

  /// <summary>
  /// Default Constructor
  /// </summary>
  /// <param name="url">A url helper to construct id urls</param>
  public ObjectStore(IUrlHelper url) {
    this.Url = url;
  }

  /// <summary>
  /// Gets a new Id for an Object
  /// </summary>
  public static string NewId {
    get {
      long idTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
      //while (_objects.ContainsKey(Base36.ToString(idTime))) idTime++;
      return Base36.ToString(idTime);
    }
  }

  /// <summary>
  /// Inserts a new object into the data store
  /// </summary>
  /// <param name="newObject">The object to store</param>
  /// <returns>
  /// The new Object to be stored 
  /// (with updated properties such as Id, Bto and Bcc removed, etc.)
  /// </returns>
  public KristofferStrube.ActivityStreams.Object InsertObject(KristofferStrube.ActivityStreams.Object newObject) {
    if (newObject.Type == null) throw new ArgumentException("Object must have Type");

    string id = NewId;
    newObject.Id = this.Url.AbsoluteContent($"~/{newObject.Type.First()}/{id}");
    newObject.Bto = newObject.Bcc = null;

    string objectType = newObject.Type.First();
    if (!ObjectController._objects.ContainsKey(objectType)) ObjectController._objects[objectType] = new();
    ObjectController._objects[objectType][id] = newObject;

    return newObject;
  }

  /// <summary>
  /// Gets an object just by Id
  /// </summary>
  /// <param name="id">The Id to find</param>
  /// <returns>The object with the corresponding id, or null if not found</returns>
  public KristofferStrube.ActivityStreams.Object? GetObjectById(string id) {
    foreach (Dictionary<string, KristofferStrube.ActivityStreams.Object> list in _objects.Values) {
      foreach (KeyValuePair<string, KristofferStrube.ActivityStreams.Object> kvp in list) {
        if (kvp.Key == id) return kvp.Value;
      }
    }
    return null;
  }

  /// <summary>
  /// Gets an object by type and id
  /// </summary>
  /// <param name="type">The type</param>
  /// <param name="id"></param>
  /// <returns></returns>
  public KristofferStrube.ActivityStreams.Object? GetObjectByTypeAndId(string type, string id) {
    type = Types.Normalize(type);
    return _objects[type]?[id];
  }

  /// <summary>
  /// Gets a list of all Objects by Type
  /// </summary>
  /// <param name="type">The type of object to retrieve</param>
  /// <returns>A list of objects of the specified type</returns>
  public List<KristofferStrube.ActivityStreams.Object> GetObjectsByType(string type) {
    type = Types.Normalize(type);
    return _objects[type]?.Values.ToList() ?? new List<KristofferStrube.ActivityStreams.Object>();
  }
}