using GB5Shared.DTO.Framework.Login;
using GB5Shared.GB5Exception;
using GB5Shared.QueueReader;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using PayRollDAL.DTO.EmployeeAttachmentImport;
using System;
using System.IO;
using System.Threading.Tasks;

namespace PayRollBLL.EmployeeAttachmentImport
{
    public class EmployeeAttachmentImportBLL : IEmployeeAttachmentImportBLL
    {
        public const string MessageType = "EMPLOYEE_ATTACHMENT_BULK_IMPORT";

        private readonly IJobQueueEnqueuer _jobQueueEnqueuer;
        private readonly IConfiguration _configuration;

        public EmployeeAttachmentImportBLL(
            IJobQueueEnqueuer jobQueueEnqueuer,
            IConfiguration configuration)
        {
            _jobQueueEnqueuer = jobQueueEnqueuer;
            _configuration = configuration;
        }

        // GB4 parity: EmployeeToUserBulkImportAsynchImport — validates the manifest file
        // exists under the AttachmentFolder before enqueueing, then returns immediately.
        public async Task<string> AttachmentBulkImportAsynch(string FileName, int IsSkip, LoginDTO LoginDTO)
        {
            if (string.IsNullOrWhiteSpace(FileName))
                throw new NotFoundException("FileName to be given for import..");

            string manifestPath = GetManifestPath(FileName);
            if (!File.Exists(manifestPath))
                throw new NotFoundException($"File not found in path: {manifestPath}");

            var jobDTO = new EmployeeAttachmentBulkImportJobDTO
            {
                FileName = FileName,
                IsSkip = IsSkip
            };

            await _jobQueueEnqueuer.EnqueueAsync(MessageType, JsonConvert.SerializeObject(jobDTO), LoginDTO);

            return $"Request accepted. After process mail will be sent to {LoginDTO.UserPrimaryMailId}";
        }

        // GB4 parity: gserverpath = ReadValueFromCommonConfig("LogPath") + "/AttachmentFolder/".
        // Shared with EmployeeAttachmentBulkImportJobHandler — kept internal so both agree on the folder.
        internal static string GetManifestPath(IConfiguration configuration, string fileName)
        {
            string logPath = configuration["LogPath"] ?? Path.Combine(Path.GetTempPath(), "GB5");
            string folder = Path.Combine(logPath, "AttachmentFolder");
            Directory.CreateDirectory(folder);
            return Path.Combine(folder, fileName);
        }

        private string GetManifestPath(string fileName) => GetManifestPath(_configuration, fileName);
    }
}