using GB5Shared.DTO.Framework.Login;
using PayRollBLL.SAPPaySlip.DTO;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace PayRollBLL.SAPPaySlip
{
    public interface ISAPPaySlipBLL
    {
        /// <summary>
        /// Retrieves the SAP payslip for the logged-in employee.
        ///
        /// Internally resolves:
        ///   • EmployeeID  → LoginDTO.UserCode
        ///   • SapClient   → morganizationunit.organizationunitcode (looked up by LoginDTO.ClientId)
        ///   • Username    → SapPaySlip:Username in appsettings.json
        ///   • Password    → SapPaySlip:Password in appsettings.json
        ///
        /// Throws <see cref="System.ArgumentException"/> when FiscalYear or Month are invalid.
        /// Throws <see cref="System.InvalidOperationException"/> when the SAP API fails,
        /// when the session context is incomplete, or when the PDF data is corrupt.
        /// </summary>
        Task<List<SapPaySlipResultDTO>> GetPaySlipAsync(
            string employeeId,
            string fiscalYear,
            string month,
            LoginDTO login,
            CancellationToken ct);
    }
}