/// <summary>
/// 检查指定地块当前是否满足限制。
/// </summary>
/// <param name="player">当前操作的玩家</param>
/// <param name="place">要检查的地块</param>
/// <returns>若不满足限制，返回原因，若满足限制，则返回null</returns>
protected virtual string Check(GamePlayer player, Place place)
{
if (player == null)
{
throw new ArgumentNullException("player");
}
if (place == null)
{
throw new ArgumentNullException("place");
}
if (InTerritory && place.Owner == player.Guid)
{
return("只能在自己的领土上上开展该活动");
}
if (TerrainType != null)
{
if (place.Terrain == null || TerrainType.IsAssignableFrom(place.Terrain.GetType()) == false)
{
return("地形不满足活动需求");
}
}
if (TerrainDescriptors.Any())
{
if (place.Terrain == null || TerrainDescriptors.Contains(place.Terrain.Descriptor.Guid) == false)
{
return("地形不满足活动需求");
}
}
if (BuildingType != null)
{
if (place.Terrain == null || BuildingType.IsAssignableFrom(place.Building.GetType()) == false)
{
return("地形不满足活动需求");
}
}
if (BuildingDescriptors.Any())
{
if (place.Terrain == null || BuildingDescriptors.Contains(place.Building.Descriptor.Guid) == false)
{
return("地形不满足活动需求");
}
}
if (UnitType != null)
{
if (place.GetUnits().All(unit => UnitType.IsAssignableFrom(unit.GetType()) == false))
{
return("单位不满足活动需求");
}
}
if (UnitDescriptors.Any())
{
if (place.GetUnits().All(unit => UnitDescriptors.Contains(unit.Descriptor.Guid) == false))
{
return("单位不满足活动需求");
}
}
return(null);
}
