namespace PKHeX.Core
{
    /// <summary>
    /// Source the Move was learned from
    /// </summary>
    public enum MoveSource
    {
        Unknown,
        None,
        Relearn,
        Initial,
        LevelUp,
        TMHM,
        Tutor,
        EggMove,
        InheritLevelUp,
        Special,
        SpecialEgg,
        ShedinjaEvo,
        Sketch,
        Shared,
    }

    /// <summary>
    /// Move specific <see cref="CheckResult"/> to contain in which Generation it was learned &amp; source.
    /// </summary>
    public sealed class CheckMoveResult : CheckResult
    {
        /// <summary>
        /// Method of learning the move.
        /// </summary>
        public readonly MoveSource Source;

        /// <summary>
        /// Generation the move was learned in.
        /// </summary>
        public readonly int Generation;

        /// <summary>
        /// Indicates if the source of the move was validated from the <see cref="PKM.RelearnMoves"/>
        /// </summary>
        public bool IsRelearn => Source == MoveSource.Relearn || (Source == MoveSource.EggMove && Generation >= 6);

        /// <summary>
        /// Indicates if the source of the move was validated as originating from an egg.
        /// </summary>
        public bool IsEggSource => Source is MoveSource.EggMove or MoveSource.InheritLevelUp;

        /// <summary>
        /// Checks if the Move should be present in a Relearn move pool (assuming Gen6+ origins).
        /// </summary>
        /// <remarks>Invalid moves that can't be validated should be here, hence the inclusion.</remarks>
        public bool ShouldBeInRelearnMoves() => Source != MoveSource.None && (!Valid || IsRelearn);

        internal CheckMoveResult(MoveSource m, int g, CheckIdentifier i)
            : base(i)
        {
            Source = m;
            Generation = g;
        }

        internal CheckMoveResult(MoveSource m, int g, Severity s, string c, CheckIdentifier i)
            : base(s, c, i)
        {
            Source = m;
            Generation = g;
        }

        internal CheckMoveResult(CheckMoveResult Org, Severity s, string c, CheckIdentifier i)
            : this(Org.Source, Org.Generation, s, c, i)
        {
        }

        internal CheckMoveResult(CheckMoveResult Org, Severity s, string c)
            : this(Org.Source, Org.Generation, s, c, Org.Identifier)
        {
        }
    }
}