zfxaction25/RobotAndDonkey.Game/Modifiers/DroughtModifier.cs

using System;
using System.Collections.Generic;
using RobotAndDonkey.Game.Board;
using RobotAndDonkey.Game.Execution.Results;
using RobotAndDonkey.Game.GameState;
using RobotAndDonkey.Game.Intents;

namespace RobotAndDonkey.Game.Modifiers;

public record DroughtModifier(EModifierDuration Duration) : Modifier(EModifierKind.Cell, EModifierId.Drought, Duration)
{
    protected override DroughtModifier CreateInstance() => new(Duration);

    public override void OnAdded(Entity owner, List<Intent> newIntents)
    {
        if (owner is not Cell cell)
            throw new NotSupportedException("Drought is only allowed in cells.");

        cell.Type = cell.Type switch
        {
            ECellType.Fertile => ECellType.Grass,
            ECellType.Grass   => ECellType.Dry,
            _                 => throw new NotSupportedException("Drought only works on Fertile and Grass")
        };
    }

    public override void OnRemoved(Entity owner, List<Intent> newIntents)
    {
        if (owner is not Cell cell)
            throw new NotSupportedException("Drought is only allowed in cells.");

        cell.Type = cell.Type switch
        {
            ECellType.Grass => ECellType.Fertile,
            ECellType.Dry   => ECellType.Grass,
            _               => throw new NotSupportedException("Drought can only be removed from Dry and Grass")
        };
    }

    public override string ToolTip => "Humidity was reduced from this land, reducing fertility and maybe drying out.";
}