using Core.Models;

namespace WebApp.Services;

/// <summary>
/// Persists parsed student event rankings.
/// </summary>
public interface IStudentEventRankingSaveService
{
    /// <summary>
    /// Students in the parse result who already have rankings stored.
    /// </summary>
    Task<IReadOnlyList<string>> GetStudentsWithExistingRankingsAsync(
        StudentEventRankingParseResult parseResult,
        CancellationToken cancellationToken = default);

    /// <summary>
    /// Replaces rankings for students who have at least one accepted rank in the parse result.
    /// Other students are left unchanged.
    /// </summary>
    Task<StudentEventRankingSaveResult> SaveAsync(
        StudentEventRankingParseResult parseResult,
        CancellationToken cancellationToken = default);
}

/// <summary>
/// Outcome of saving imported event rankings.
/// </summary>
public class StudentEventRankingSaveResult
{
    public int StudentsUpdated { get; set; }

    public int RankingsSaved { get; set; }
}