using System;
using System.Linq;
using System.Threading.Tasks;
using UtopiaCanteenSystem.Data;
using UtopiaCanteenSystem.Models;

namespace UtopiaCanteenSystem.Services;

/// <summary>
/// Persists simple admin login audit records to the local SQLite database.
/// </summary>
public class AdminAuditService : IAdminAuditService
{
    private readonly DbContextFactory _dbFactory;

    public AdminAuditService(DbContextFactory dbFactory)
    {
        _dbFactory = dbFactory;
    }

    public async Task RecordLoginAsync(string username, string employeeId)
    {
        try
        {
            await using var db = _dbFactory.CreateDbContext();
            var record = new AdminLoginRecord
            {
                Username = username ?? string.Empty,
                EmployeeId = employeeId ?? string.Empty,
                LoginTimeUtc = DateTime.UtcNow
            };
            db.AdminLoginRecords.Add(record);
            await db.SaveChangesAsync().ConfigureAwait(false);
        }
        catch
        {
            // Audit failures should never block login; ignore errors.
        }
    }

    /// <summary>
    /// Returns the most recent admin login record for this kiosk, or null if none exist.
    /// </summary>
    public AdminLoginRecord? GetLastLogin()
    {
        try
        {
            using var db = _dbFactory.CreateDbContext();
            return db.AdminLoginRecords
                .OrderByDescending(x => x.LoginTimeUtc)
                .FirstOrDefault();
        }
        catch
        {
            return null;
        }
    }
}