using System;

namespace Chernobyl.Switch
{
    /// <summary>
    /// Known as an "OR Gate" in boolean logic, this switch will fire the event
    /// <see cref="AndSwitch.SwitchedOn"/> when <see cref="AndSwitch.Switch1(object, EventArgs)"/>
    /// or <see cref="AndSwitch.Switch2(object, EventArgs)"/> have been invoked.
    /// </summary>
    public class OrSwitch : ISwitch
    {
        /// <summary>
        /// An event handler that can be assigned to an event. When this method
        /// is invoked, it will invoke the <see cref="AndSwitch.SwitchedOn"/>
        /// event.
        /// </summary>
        /// <param name="sender">The sender of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance 
        /// containing the event data.</param>
        public void Switch1(object sender, EventArgs e)
        {
            if (SwitchedOn != null)
                SwitchedOn(this, e);
        }

        /// <summary>
        /// An event handler that can be assigned to an event. When this method
        /// is invoked, it will invoke the <see cref="AndSwitch.SwitchedOn"/>
        /// event.
        /// </summary>
        /// <param name="sender">The sender of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance 
        /// containing the event data.</param>
        public void Switch2(object sender, EventArgs e)
        {
            if (SwitchedOn != null)
                SwitchedOn(this, e);
        }

        /// <summary>
        /// An event that is raised when this switch has been switched on.
        /// </summary>
        public event EventHandler SwitchedOn;

        /// <summary>
        /// An event that is raised right after this switch has been switched
        /// off (or reset).
        /// </summary>
        public event EventHandler SwitchedOff;

        /// <summary>
        /// Resets the switch to its original state or the its state after right
        /// after its creation.
        /// </summary>
        public void Reset()
        {
            if (SwitchedOff != null)
                SwitchedOff(this, EventArgs.Empty);
        }

        /// <summary>
        /// An event handler that can be assigned to an event. This event handler
        /// will reset the switch to its original state. It is exactly the same
        /// as calling <see cref="ISwitch.Reset()"/>.
        /// </summary>
        /// <param name="sender">The sender of the event.</param>
        /// <param name="e">The arguments to the event.</param>
        public void Reset(object sender, EventArgs e)
        {
            Reset();
        }
    }
}