using Core.Entities;

namespace WebApp.Models;

/// <summary>
/// Extension methods for sorting teams with group teams (EventFormat.Team) appearing before individual teams (EventFormat.Individual).
/// </summary>
public static class TeamExtensions
{
    /// <summary>
    /// Orders teams with group teams (EventFormat.Team) first, then individual teams (EventFormat.Individual).
    /// For use with EF Core IQueryable queries.
    /// </summary>
    /// <param name="teams">The queryable collection of teams to sort.</param>
    /// <returns>An ordered queryable with group teams first, then individual teams.</returns>
    public static IOrderedQueryable<Team> OrderByEventFormatFirst(this IQueryable<Team> teams)
    {
        return teams.OrderByDescending(t => t.Event.EventFormat == EventFormat.Team ? 1 : 0);
    }

    /// <summary>
    /// Orders teams with group teams (EventFormat.Team) first, then individual teams (EventFormat.Individual).
    /// For use with in-memory IEnumerable collections.
    /// </summary>
    /// <param name="teams">The collection of teams to sort.</param>
    /// <returns>An ordered enumerable with group teams first, then individual teams.</returns>
    public static IOrderedEnumerable<Team> OrderByEventFormatFirst(this IEnumerable<Team> teams)
    {
        return teams.OrderByDescending(t => t.Event.EventFormat == EventFormat.Team ? 1 : 0);
    }

    /// <summary>
    /// Orders teams with group teams first, then applies default secondary sorting:
    /// Event.Name (ascending), then Identifier (ascending with nulls last).
    /// </summary>
    /// <param name="teams">The collection of teams to sort.</param>
    /// <returns>An ordered enumerable with group teams first and default secondary sorting applied.</returns>
    public static IOrderedEnumerable<Team> OrderByEventFormatFirstWithDefaults(this IEnumerable<Team> teams)
    {
        return teams
            .OrderByEventFormatFirst()
            .ThenBy(t => t.Event.Name)
            .ThenBy(t => t.Identifier ?? "");
    }
}