using GB5Shared.DTO.Framework.Login;
using System;
using System.Collections.Generic;
using System.Threading;

namespace GB5Shared.Archive
{
    /// <summary>
    /// Optional interface for exporting audit rows to cold storage (S3, Azure Blob, etc.)
    /// before or instead of the SQL archive table approach.
    ///
    /// Implement per-environment as needed. The GB5 default archive strategy uses
    /// TEVENTLOG_ARCHIVE (SQL); this interface exists for tenants that require
    /// off-database long-term storage.
    ///
    /// Typical usage: stream rows via <see cref="ExportAsync"/>, write to blob, then
    /// call <see cref="FrameworkDAL.CustomCode.Archive.IEventLogArchiveDAL.DeleteHotRowsAsync"/>.
    /// </summary>
    public interface IArchiveExportService
    {
        /// <summary>
        /// Streams audit event rows older than <paramref name="olderThan"/> for the given tenant.
        /// Caller is responsible for writing the stream to external storage.
        /// </summary>
        IAsyncEnumerable<AuditExportRow> ExportAsync(
            DateTime  olderThan,
            LoginDTO  login,
            CancellationToken ct = default);
    }

    public sealed class AuditExportRow
    {
        public int     EventLogId   { get; set; }
        public int     EventTypeId  { get; set; }
        public int     UserId       { get; set; }
        public int     TenantId     { get; set; }
        public string? EventText    { get; set; }
        public string? Data         { get; set; }
        public DateTime Timestamp   { get; set; }
    }
}