// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

namespace System.Device.Gpio.Drivers
{
    /// <summary>
    /// The base class for the standard unix drivers
    /// </summary>
    public abstract class UnixDriver : GpioDriver
    {
        /// <summary>
        /// Construct an instance of an unix driver.
        /// </summary>
        protected UnixDriver()
        {
            if (Environment.OSVersion.Platform != PlatformID.Unix)
            {
                throw new PlatformNotSupportedException(GetType().Name + " is only supported on Linux/Unix");
            }
        }

        /// <summary>
        /// Static factory method
        /// </summary>
        /// <returns>An instance of GpioDriver, depending on which one fits</returns>
        // TODO: remove try catch after https://github.com/dotnet/corefx/issues/32015 deployed
        public static UnixDriver Create()
        {
            if (Environment.OSVersion.Platform != PlatformID.Unix)
            {
                throw new PlatformNotSupportedException(nameof(UnixDriver) + " is only supported on Linux/Unix");
            }

            UnixDriver? driver = null;
            try
            {
                driver = new LibGpiodDriver();
            }
            catch (PlatformNotSupportedException)
            {
                driver = new SysFsDriver();
            }

            return driver;
        }
    }
}