using Unosquare.RaspberryIO.Camera;
using Unosquare.RaspberryIO.Computer;
using Unosquare.RaspberryIO.Gpio;
using Unosquare.RaspberryIO.Native;
using System.Threading.Tasks;
using Unosquare.Swan.Components;
using System;

namespace Unosquare.RaspberryIO {
  /// <summary>
  /// Our main character. Provides access to the Raspberry Pi's GPIO, system and board information and Camera
  /// </summary>
  public static class Pi {
    private static readonly Object SyncLock = new Object();

    /// <summary>
    /// Initializes static members of the <see cref="Pi" /> class.
    /// </summary>
    static Pi() {
      lock(SyncLock) {
        // Extraction of embedded resources
        Resources.EmbeddedResources.ExtractAll();

        // Instance assignments
        Gpio = GpioController.Instance;
        Info = SystemInfo.Instance;
        Timing = Timing.Instance;
        Spi = SpiBus.Instance;
        I2C = I2CBus.Instance;
        Camera = CameraController.Instance;
        PiDisplay = DsiDisplay.Instance;
      }
    }

    #region Components

    /// <summary>
    /// Provides access to the Raspberry Pi's GPIO as a collection of GPIO Pins.
    /// </summary>
    public static GpioController Gpio {
      get;
    }

    /// <summary>
    /// Provides information on this Raspberry Pi's CPU and form factor.
    /// </summary>
    public static SystemInfo Info {
      get;
    }

    /// <summary>
    /// Provides access to The PI's Timing and threading API
    /// </summary>
    public static Timing Timing {
      get;
    }

    /// <summary>
    /// Provides access to the 2-channel SPI bus
    /// </summary>
    public static SpiBus Spi {
      get;
    }

    /// <summary>
    /// Provides access to the functionality of the i2c bus.
    /// </summary>
    public static I2CBus I2C {
      get;
    }

    /// <summary>
    /// Provides access to the official Raspberry Pi Camera
    /// </summary>
    public static CameraController Camera {
      get;
    }

    /// <summary>
    /// Provides access to the official Raspberry Pi 7-inch DSI Display
    /// </summary>
    public static DsiDisplay PiDisplay {
      get;
    }

    /// <summary>
    /// Gets the logger source name.
    /// </summary>
    internal static String LoggerSource => typeof(Pi).Namespace;

    #endregion

    #region Methods

    /// <summary>
    /// Restarts the Pi. Must be running as SU
    /// </summary>
    /// <returns>The process result</returns>
    public static async Task<ProcessResult> RestartAsync() => await ProcessRunner.GetProcessResultAsync("reboot", null, null);

    /// <summary>
    /// Restarts the Pi. Must be running as SU
    /// </summary>
    /// <returns>The process result</returns>
    public static ProcessResult Restart() => RestartAsync().GetAwaiter().GetResult();

    /// <summary>
    /// Halts the Pi. Must be running as SU
    /// </summary>
    /// <returns>The process result</returns>
    public static async Task<ProcessResult> ShutdownAsync() => await ProcessRunner.GetProcessResultAsync("halt", null, null);

    /// <summary>
    /// Halts the Pi. Must be running as SU
    /// </summary>
    /// <returns>The process result</returns>
    public static ProcessResult Shutdown() => ShutdownAsync().GetAwaiter().GetResult();

    #endregion
  }
}