using GB5Shared.DTO.Framework.Login;
using PayRollBLL.SAP.Client;
using System.Collections.Generic;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;

namespace PayRollBLL.SAP
{
    public interface IITDeclarationSapBLL
    {
        /// <summary>
        /// Generates SAP-compatible JSON payloads for the requested infotypes.
        /// Returns a dictionary keyed by infotype number (e.g. 580, 581…).
        /// Infotypes with no matching declaration data are omitted from the result.
        /// </summary>
        /// <param name="declarationId">0 = all matching other filters.</param>
        /// <param name="employeeId">0 = all.</param>
        /// <param name="periodId">0 = all.</param>
        /// <param name="infotype">0 = all 580–586; otherwise a single infotype.</param>
        /// <param name="date">SAP header date in dd.MM.yyyy format.</param>
        /// <param name="remarks">SAP payload remarks.</param>
        Task<Dictionary<int, string>> GenerateSapPayloadsAsync(
            int declarationId,
            int employeeId,
            int periodId,
            int infotype,
            string date,
            string remarks,
            LoginDTO login,
            CancellationToken ct);

        /// <summary>
        /// Pushes the generated payloads to SAP HTTP endpoints.
        /// Returns one result per infotype attempted.
        /// </summary>
        Task<List<SapPushResultDTO>> PushToSapAsync(
            int declarationId,
            int employeeId,
            int periodId,
            int infotype,
            string date,
            string remarks,
            LoginDTO login,
            CancellationToken ct);
    }

    /// <param name="Infotype">SAP infotype number, e.g. 580.</param>
    /// <param name="Description">
    /// Sub-type label within an infotype, e.g. "Housing Loan" or "Other Income Sources".
    /// Empty string for infotypes with a single sub-type.
    /// </param>
    /// <param name="EndpointPath">OData entity-set path that was POSTed to.</param>
    /// <param name="IsSuccess">True when SAP confirmed the post without business errors.</param>
    /// <param name="HttpStatus">HTTP status code from SAP (0 = network failure).</param>
    /// <param name="ResponseBody">Raw SAP response body (for diagnostics / audit).</param>
    /// <param name="Message">
    /// User-facing result message.
    /// Success → "IT Declaration data posted to SAP successfully."
    /// SAP error → SAP's exact error text (e.g. "A record already exists …").
    /// Network / config error → descriptive reason.
    /// </param>
    /// <param name="Payload">The JSON payload that was sent to SAP (for diagnostics / audit).</param>
    public record SapPushResultDTO(
        int          Infotype,
        string       Description,
        string       EndpointPath,
        bool         IsSuccess,
        int          HttpStatus,
        string       ResponseBody,
        string       Message,
        JsonElement? Payload);
}