using System;
using Unosquare.Swan.Abstractions;

namespace Unosquare.RaspberryIO.Gpio {
  /// <summary>
  /// The SPI Bus containing the 2 SPI channels
  /// </summary>
  public class SpiBus : SingletonBase<SpiBus> {
    /// <summary>
    /// Prevents a default instance of the <see cref="SpiBus"/> class from being created.
    /// </summary>
    private SpiBus() {
      // placeholder
    }

    #region SPI Access

    /// <summary>
    /// Gets or sets the channel 0 frequency in Hz.
    /// </summary>
    /// <value>
    /// The channel0 frequency.
    /// </value>
    public Int32 Channel0Frequency {
      get; set;
    }

    /// <summary>
    /// Gets the SPI bus on channel 1.
    /// </summary>
    /// <value>
    /// The channel0.
    /// </value>
    public SpiChannel Channel0 {
      get {
        if(this.Channel0Frequency == 0) {
          this.Channel0Frequency = SpiChannel.DefaultFrequency;
        }

        return SpiChannel.Retrieve(SpiChannelNumber.Channel0, this.Channel0Frequency);
      }
    }

    /// <summary>
    /// Gets or sets the channel 1 frequency in Hz
    /// </summary>
    /// <value>
    /// The channel1 frequency.
    /// </value>
    public Int32 Channel1Frequency {
      get; set;
    }

    /// <summary>
    /// Gets the SPI bus on channel 1.
    /// </summary>
    /// <value>
    /// The channel1.
    /// </value>
    public SpiChannel Channel1 {
      get {
        if(this.Channel1Frequency == 0) {
          this.Channel1Frequency = SpiChannel.DefaultFrequency;
        }

        return SpiChannel.Retrieve(SpiChannelNumber.Channel1, this.Channel1Frequency);
      }
    }

    #endregion
  }
}