namespace Nonemm.Contests.Multipliers;

/// US states and Canadian provinces, in the groupings contests count.
public static class StatesAndProvinces
{
    /// The 48 contiguous states.
    public static readonly IReadOnlySet<string> ContiguousStates = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
    {
        "AL", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA", "ID", "IL", "IN", "IA",
        "KS", "KY", "LA", "ME", "MD", "MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV",
        "NH", "NJ", "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC", "SD",
        "TN", "TX", "UT", "VT", "VA", "WA", "WV", "WI", "WY",
    };

    public static readonly IReadOnlySet<string> AllStates =
        new HashSet<string>(ContiguousStates.Concat(["AK", "HI"]), StringComparer.OrdinalIgnoreCase);

    /// The 13 Canadian provinces and territories.
    public static readonly IReadOnlySet<string> Provinces = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
    {
        "NS", "QC", "ON", "MB", "SK", "AB", "BC", "NT", "NB", "NL", "PE", "YT", "NU",
    };

    /// What ARRL DX counts for a DX station: the contiguous states, the District
    /// of Columbia, and the Canadian provinces and territories.
    public static readonly IReadOnlySet<string> ArrlDxMultipliers =
        new HashSet<string>(ContiguousStates.Concat(["DC"]).Concat(Provinces), StringComparer.OrdinalIgnoreCase);

    public static bool IsStateOrProvince(string text) =>
        AllStates.Contains(text.Trim()) || Provinces.Contains(text.Trim()) ||
        text.Trim().Equals("DC", StringComparison.OrdinalIgnoreCase);
}