using System;
using System.Collections.Generic;

namespace Artemis.Core
{
    /// <summary>
    ///     Represents a model that can have a broken state
    /// </summary>
    public interface IBreakableModel
    {
        /// <summary>
        ///     Gets the display name of this breakable model
        /// </summary>
        string BrokenDisplayName { get; }

        /// <summary>
        ///     Gets or sets the broken state of this breakable model, if <see langword="null" /> this model is not broken.
        /// </summary>
        string? BrokenState { get; set; }

        /// <summary>
        ///     Gets or sets the exception that caused the broken state
        /// </summary>
        Exception? BrokenStateException { get; set; }

        /// <summary>
        ///     Try to execute the provided action. If the action succeeded the broken state is cleared if it matches
        ///     <see paramref="breakMessage" />, if the action throws an exception <see cref="BrokenState" /> and
        ///     <see cref="BrokenStateException" /> are set accordingly.
        /// </summary>
        /// <param name="action">The action to attempt to execute</param>
        /// <param name="breakMessage">The message to clear on succeed or set on failure (exception)</param>
        /// <returns><see langword="true" /> if the action succeeded; otherwise <see langword="false" />.</returns>
        bool TryOrBreak(Action action, string breakMessage);

        /// <summary>
        ///     Sets the broken state to the provided state and optional exception.
        /// </summary>
        /// <param name="state">The state to set the broken state to</param>
        /// <param name="exception">The exception that caused the broken state</param>
        public void SetBrokenState(string state, Exception? exception);

        /// <summary>
        ///     Clears the broken state and exception if <see cref="BrokenState" /> equals <see paramref="state"></see>.
        /// </summary>
        /// <param name="state"></param>
        public void ClearBrokenState(string state);
        
        /// <summary>
        ///     Returns a list containing all broken models, including self and any children
        /// </summary>
        IEnumerable<IBreakableModel> GetBrokenHierarchy();

        /// <summary>
        ///     Occurs when the broken state of this model changes
        /// </summary>
        event EventHandler BrokenStateChanged;
    }
}