using Core.YearTransition;

namespace WebApp.Services;

/// <summary>
/// Options for applying a year rollover.
/// </summary>
public sealed class YearRolloverOptions
{
    public required YearTransitionPlan Plan { get; init; }
    public bool ClearEventOccurrences { get; init; } = true;
}

/// <summary>
/// Result of a successful year rollover.
/// </summary>
public sealed class YearRolloverResult
{
    public required string BackupPath { get; init; }
    public required int StudentsRemoved { get; init; }
    public required int StudentsPromoted { get; init; }
    public required int TeamsDeleted { get; init; }
    public required int RankingsDeleted { get; init; }
    public required int MeetingHistoriesDeleted { get; init; }
    public required int EventOccurrencesDeleted { get; init; }
    public required string CompetitionYear { get; init; }
    public required IReadOnlyList<string> OfficerSummary { get; init; }
}

/// <summary>
/// Applies a year-transition plan to the database.
/// </summary>
public interface IYearRolloverService
{
    Task<YearRolloverResult> ApplyAsync(YearRolloverOptions options, CancellationToken cancellationToken = default);
}