using Core.Entities;

namespace Core.Printing;

/// <summary>
/// Rank labels and colors shared by the ranking index, print badges, and legend.
/// </summary>
public static class EventRankLegend
{
    public static readonly IReadOnlyList<(int Rank, string Label)> Items =
    [
        .. Enumerable.Range(1, StudentEventRanking.MaxRank)
            .Select(rank => (rank, Ordinal(rank)))
    ];

    public static string Ordinal(int num)
    {
        if (num <= 0)
            return num.ToString();

        switch (num % 100)
        {
            case 11:
            case 12:
            case 13:
                return num + "th";
        }

        return (num % 10) switch
        {
            1 => num + "st",
            2 => num + "nd",
            3 => num + "rd",
            _ => num + "th"
        };
    }

    public static string ColorHex(int rank) =>
        rank switch
        {
            1 => "#dd7e6b",
            2 => "#ea9999",
            3 => "#f9cb9c",
            4 => "#ffe599",
            5 => "#fff2cc",
            6 => "#fffaea",
            7 => "#fffefa",
            8 => "#fffefc",
            9 => "#fffffd",
            10 => "#fffffe",
            _ => "#ddd"
        };
}