using Nonemm.Core;
using Nonemm.Core.Calls;
using Nonemm.Core.Country;

namespace Nonemm.Contests;

/// A QSO together with what the country file says about it, so a contest can
/// score by country, zone or continent without looking anything up itself.
public sealed record QsoContext(Qso Qso, CountryLookup? Country, StationInfo Me, ContestEntry Entry)
{
    /// The call history file the operator loaded, which a contest can count a
    /// multiplier from. Empty when there is none.
    public CallHistory History { get; init; } = CallHistory.Empty;

    public Band? Band => Qso.Band;

    public ModeCategory ModeCategory => Qso.Mode.Category;

    /// What the contact says wins over the country file. The two agree unless
    /// the operator corrected the country by hand, and then the correction is
    /// the point.
    public string Continent =>
        Qso.Continent.Trim().Length > 0 ? Qso.Continent.Trim() : Country?.Continent ?? "";

    public string CountryPrefix =>
        Qso.CountryPrefix.Trim().Length > 0
            ? Qso.CountryPrefix.Trim()
            : Country?.Entity.PrimaryPrefix ?? "";

    public int CqZone => Country?.CqZone ?? Qso.Zone;

    public int ItuZone => Country?.ItuZone ?? 0;

    public bool IsSameCountry => CountryPrefix.Length > 0 && CountryPrefix == Me.CountryPrefix;

    /// Great-circle kilometres between the two grid squares, and zero when
    /// either station has no locator.
    public double DistanceKm =>
        GridSquare.TryParse(Qso.GridSquare, out GridSquare theirs)
        && GridSquare.TryParse(Me.GridSquare, out GridSquare mine)
            ? mine.DistanceTo(theirs)
            : 0.0;

    public bool IsSameContinent => Continent.Length > 0 && Continent == Me.Continent;
}