using _2024;

Console.Write("Enter a day: ");
var input = Console.ReadLine();

if (!int.TryParse(input, out var day)) {
    Console.Error.WriteLine("Error: input is not a valid integer.");
    Environment.Exit(1);
}

if (day is < 1 or > 25) {
    Console.Error.WriteLine("Error: day must be between 1 and 25.");
    Environment.Exit(1);
}

var dayStr = day.ToString();
if (day < 10) {
    dayStr = "0" + dayStr;
}

// Instantiate an ISolution named 's' based on the day, e.g., Day02 for day == 2, then run it
var typeName = $"_2024.Day{dayStr}";
var type = typeof(ISolution).Assembly.GetType(typeName);

if (type is null || !typeof(ISolution).IsAssignableFrom(type)) {
    Console.Error.WriteLine($"Error: could not find a solution class for day {dayStr}.");
    Environment.Exit(1);
}

var s = (ISolution)Activator.CreateInstance(type)!;
s.Run();