/******************************************************************************
 * Copyright (C) Leap Motion, Inc. 2011-2018.                                 *
 * Leap Motion proprietary and confidential.                                  *
 *                                                                            *
 * Use subject to the terms of the Leap Motion SDK Agreement available at     *
 * https://developer.leapmotion.com/sdk_agreement, or another agreement       *
 * between Leap Motion and you, your company or other organization.           *
 ******************************************************************************/

namespace Leap {

  using System;
  using System.Collections.Generic;
  using LeapInternal;

  /// <summary>
  /// The Config class provides access to Leap Motion system configuration information.
  /// 
  /// @since 1.0
  /// </summary>
  public class Config {
    private Connection _connection;
    private Dictionary<UInt32, object> _transactions = new Dictionary<UInt32, object>();

    /// <summary>
    /// Creates a new Config object for setting runtime configuration settings.
    /// 
    /// Note that the Controller.Config provides a properly initialized Config object already.
    /// @since 3.0
    /// </summary>
    public Config(int connectionKey) {
      _connection = Connection.GetConnection(connectionKey);
      _connection.LeapConfigChange += handleConfigChange;
      _connection.LeapConfigResponse += handleConfigResponse;
    }

    private void handleConfigChange(object sender, ConfigChangeEventArgs eventArgs) {
      object actionDelegate;
      if (_transactions.TryGetValue(eventArgs.RequestId, out actionDelegate)) {
        Action<bool> changeAction = actionDelegate as Action<bool>;
        changeAction(eventArgs.Succeeded);
        _transactions.Remove(eventArgs.RequestId);
      }
    }

    private void handleConfigResponse(object sender, SetConfigResponseEventArgs eventArgs) {
      object actionDelegate = new object();
      if (_transactions.TryGetValue(eventArgs.RequestId, out actionDelegate)) {
        switch (eventArgs.DataType) {
          case ValueType.TYPE_BOOLEAN:
            Action<bool> boolAction = actionDelegate as Action<bool>;
            boolAction((int)eventArgs.Value != 0);
            break;
          case ValueType.TYPE_FLOAT:
            Action<float> floatAction = actionDelegate as Action<float>;
            floatAction((float)eventArgs.Value);
            break;
          case ValueType.TYPE_INT32:
            Action<Int32> intAction = actionDelegate as Action<Int32>;
            intAction((Int32)eventArgs.Value);
            break;
          case ValueType.TYPE_STRING:
            Action<string> stringAction = actionDelegate as Action<string>;
            stringAction((string)eventArgs.Value);
            break;
          default:
            break;
        }
        _transactions.Remove(eventArgs.RequestId);
      }
    }

    /// <summary>
    /// Requests a configuration value.
    /// 
    /// You must provide an action to take when the Leap service returns the config value.
    /// The Action delegate must take a parameter matching the config value type. The current
    /// value of the setting is passed to this delegate.
    /// 
    /// @since 3.0
    /// </summary>
    public bool Get<T>(string key, Action<T> onResult) {
      uint requestId = _connection.GetConfigValue(key);
      if (requestId > 0) {
        _transactions.Add(requestId, onResult);
        return true;
      }
      return false;
    }

    /// <summary>
    /// Sets a configuration value.
    /// 
    /// You must provide an action to take when the Leap service sets the config value.
    /// The Action delegate must take a boolean parameter. The service calls this delegate
    /// with the value true if the setting was changed successfully and false, otherwise.
    /// 
    /// @since 3.0
    /// </summary>
    public bool Set<T>(string key, T value, Action<bool> onResult) where T : IConvertible {
      uint requestId = _connection.SetConfigValue<T>(key, value);

      if (requestId > 0) {
        _transactions.Add(requestId, onResult);
        return true;
      }
      return false;
    }

    [Obsolete("Use the generic Set<T> method instead.")]
    public ValueType Type(string key) {
      return ValueType.TYPE_UNKNOWN;
    }

    [Obsolete("Use the generic Get<T> method instead.")]
    public bool GetBool(string key) {
      return false;
    }

    [Obsolete("Use the generic Set<T> method instead.")]
    public bool SetBool(string key, bool value) {
      return false;
    }

    [Obsolete("Use the generic Get<T> method instead.")]
    public bool GetInt32(string key) {
      return false;
    }

    [Obsolete("Use the generic Set<T> method instead.")]
    public bool SetInt32(string key, int value) {
      return false;
    }

    [Obsolete("Use the generic Get<T> method instead.")]
    public bool GetFloat(string key) {
      return false;
    }

    [Obsolete("Use the generic Set<T> method instead.")]
    public bool SetFloat(string key, float value) {
      return false;
    }

    [Obsolete("Use the generic Get<T> method instead.")]
    public bool GetString(string key) {
      return false;
    }

    [Obsolete("Use the generic Set<T> method instead.")]
    public bool SetString(string key, string value) {
      return false;
    }

    [Obsolete]
    public bool Save() {
      return false;
    }

    /// <summary>
    /// Enumerates the possible data types for configuration values.
    /// @since 1.0
    /// </summary>
    public enum ValueType {
      TYPE_UNKNOWN = 0,
      TYPE_BOOLEAN = 1,
      TYPE_INT32 = 2,
      TYPE_FLOAT = 6,
      TYPE_STRING = 8,
    }
  }
}