Прогресс загрузки прайса 0–100% и экспорт накладных (#1)

## Summary
- Реальный прогресс загрузки прайса 0–100%: по байтам при скачивании,
затем по позициям при обработке и сохранении в БД
- Настройка папки экспорта накладных и CSV-экспорт из контекстного меню

## Test plan
- [ ] Запустить обновление прайса и убедиться, что полоска идёт от 0 до
100 с текстом «сколько / сколько»
- [ ] В авторизации задать папку экспорта накладных
- [ ] Экспортировать накладную в CSV через контекстное меню

src/ElectronicPharmacy/App.config

@@ -36,6 +36,9 @@
       <setting name="stringToken" serializeAs="String">
         <value />
       </setting>
+      <setting name="InvoiceExportPath" serializeAs="String">
+        <value />
+      </setting>
     </Электронная_Фармация.Properties.Settings>
   </userSettings>
 </configuration>

src/ElectronicPharmacy/Classes/ApiClient.cs

@@ -98,7 +98,13 @@ namespace Электронная_Фармация.Classes
 
         public bool IsAuthenticated => !string.IsNullOrEmpty(_token);
 
-        public async Task<PriceSummaryResponse> GetPriceSummaryAsync(string supplierId = null, string regionId = null, string q = null, int? limit = null, int? offset = null)
+        public async Task<PriceSummaryResponse> GetPriceSummaryAsync(
+            string supplierId = null,
+            string regionId = null,
+            string q = null,
+            int? limit = null,
+            int? offset = null,
+            IProgress<HttpTransferProgress> transferProgress = null)
         {
             EnsureAuthenticated();
 
@@ -130,7 +136,10 @@ namespace Электронная_Фармация.Classes
                 path += "?" + string.Join("&", queryParams);
             }
 
-            var responseBody = await SendAuthorizedGetAsync(path, "загрузку прайса");
+            var responseBody = transferProgress == null
+                ? await SendAuthorizedGetAsync(path, "загрузку прайса")
+                : await SendAuthorizedGetWithProgressAsync(path, "загрузку прайса", transferProgress);
+
             try
             {
                 var summary = JsonSerializer.Deserialize<PriceSummaryResponse>(responseBody, JsonOptions);
@@ -174,6 +183,14 @@ namespace Электронная_Фармация.Classes
         }
 
         private async Task<string> SendAuthorizedGetAsync(string path, string operationName)
+        {
+            return await SendAuthorizedGetWithProgressAsync(path, operationName, null);
+        }
+
+        private async Task<string> SendAuthorizedGetWithProgressAsync(
+            string path,
+            string operationName,
+            IProgress<HttpTransferProgress> transferProgress)
         {
             var fullUrl = BuildFullUrl(path);
             var stopwatch = Stopwatch.StartNew();
@@ -185,8 +202,8 @@ namespace Электронная_Фармация.Classes
                 using (var httpRequest = new HttpRequestMessage(HttpMethod.Get, fullUrl))
                 {
                     httpRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", _token);
-                    var response = await _httpClient.SendAsync(httpRequest);
+                    var response = await _httpClient.SendAsync(httpRequest, HttpCompletionOption.ResponseHeadersRead);
-                    var responseBody = await response.Content.ReadAsStringAsync();
+                    var responseBody = await ReadContentWithProgressAsync(response, transferProgress);
                     stopwatch.Stop();
 
                     AppDebugLog.ApiResponse("GET", fullUrl, (int)response.StatusCode, stopwatch.ElapsedMilliseconds, responseBody);
@@ -243,6 +260,29 @@ namespace Электронная_Фармация.Classes
             }
         }
 
+        private static async Task<string> ReadContentWithProgressAsync(
+            HttpResponseMessage response,
+            IProgress<HttpTransferProgress> transferProgress)
+        {
+            var totalBytes = response.Content.Headers.ContentLength;
+            using (var stream = await response.Content.ReadAsStreamAsync())
+            using (var memory = new System.IO.MemoryStream())
+            {
+                var buffer = new byte[81920];
+                long received = 0;
+                int read;
+                while ((read = await stream.ReadAsync(buffer, 0, buffer.Length).ConfigureAwait(false)) > 0)
+                {
+                    memory.Write(buffer, 0, read);
+                    received += read;
+                    transferProgress?.Report(new HttpTransferProgress(received, totalBytes));
+                }
+
+                transferProgress?.Report(new HttpTransferProgress(received, totalBytes ?? received));
+                return Encoding.UTF8.GetString(memory.ToArray());
+            }
+        }
+
         private string ParseLoginResponse(HttpResponseMessage response, string responseBody)
         {
             if (response.IsSuccessStatusCode)
@@ -333,4 +373,29 @@ namespace Электронная_Фармация.Classes
         public string InvoiceSum { get; set; }
         public string RefuseSum { get; set; }
     }
+
+    public sealed class HttpTransferProgress
+    {
+        public HttpTransferProgress(long bytesReceived, long? totalBytes)
+        {
+            BytesReceived = bytesReceived;
+            TotalBytes = totalBytes;
+        }
+
+        public long BytesReceived { get; }
+        public long? TotalBytes { get; }
+
+        public int Percent
+        {
+            get
+            {
+                if (!TotalBytes.HasValue || TotalBytes.Value <= 0)
+                {
+                    return 0;
+                }
+
+                return (int)Math.Max(0, Math.Min(100, (100.0 * BytesReceived) / TotalBytes.Value));
+            }
+        }
+    }
 }

src/ElectronicPharmacy/Classes/AppConfig.cs

@@ -108,5 +108,16 @@ namespace Электронная_Фармация.Classes
             Settings.Default.LocationId = (locationId ?? string.Empty).Trim();
             Settings.Default.Save();
         }
+
+        public static string InvoiceExportPath
+        {
+            get { return Settings.Default.InvoiceExportPath ?? string.Empty; }
+        }
+
+        public static void SetInvoiceExportPath(string path)
+        {
+            Settings.Default.InvoiceExportPath = (path ?? string.Empty).Trim();
+            Settings.Default.Save();
+        }
     }
 }

src/ElectronicPharmacy/Classes/InvoiceExportService.cs

@@ -0,0 +1,194 @@
+using System;
+using System.Globalization;
+using System.IO;
+using System.Text;
+using System.Windows.Forms;
+using System.Data.SQLite;
+
+namespace Электронная_Фармация.Classes
+{
+    /// <summary>
+    /// Exports a local invoice (header + items) to a CSV file in the configured folder.
+    /// </summary>
+    public sealed class InvoiceExportService
+    {
+        public string ExportInvoice(string invoiceId, IWin32Window owner = null)
+        {
+            if (string.IsNullOrWhiteSpace(invoiceId))
+            {
+                throw new ArgumentException("Не указана накладная для экспорта.", nameof(invoiceId));
+            }
+
+            var folder = ResolveExportFolder(owner);
+            if (string.IsNullOrWhiteSpace(folder))
+            {
+                throw new InvalidOperationException("Не указана папка для экспорта накладных.");
+            }
+
+            if (!Directory.Exists(folder))
+            {
+                Directory.CreateDirectory(folder);
+            }
+
+            InvoiceHeader header;
+            using (var con = new SQLiteConnection(AppConfig.SqliteConnectionString))
+            {
+                con.Open();
+                header = LoadHeader(con, invoiceId);
+                var itemsSql = @"
+select
+    ifnull([GoodCode], '') as [GoodCode],
+    ifnull([Good], '') as [Good],
+    ifnull([ProducerName], '') as [ProducerName],
+    ifnull([GoodsGount], 0) as [Qty],
+    ifnull([PriceSupplierWithNDS], ifnull([PriceSupplierWithoutNDS], 0)) as [Price],
+    ifnull([SumWithNDS], ifnull([SumWithoutNDS], 0)) as [Sum],
+    ifnull([BestBefore], '') as [BestBefore],
+    ifnull([Serial], '') as [Serial]
+from [InvoiceItem]
+where [idInvoice] = @invoiceId
+order by [Good];";
+
+                var fileName = BuildFileName(header);
+                var filePath = Path.Combine(folder, fileName);
+
+                var sb = new StringBuilder();
+                sb.AppendLine("Номер накладной;Дата;Поставщик;Грузополучатель;Номер заказа;Сумма");
+                sb.AppendLine(string.Join(";",
+                    Csv(header.Number),
+                    Csv(header.Date),
+                    Csv(header.Supplier),
+                    Csv(header.Consignee),
+                    Csv(header.OrderNumber),
+                    Csv(header.Sum)));
+                sb.AppendLine();
+                sb.AppendLine("Код товара;Товар;Производитель;Количество;Цена;Сумма;Срок годности;Серия");
+
+                using (var cmd = new SQLiteCommand(itemsSql, con))
+                {
+                    cmd.Parameters.AddWithValue("@invoiceId", invoiceId);
+                    using (var reader = cmd.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            sb.AppendLine(string.Join(";",
+                                Csv(reader["GoodCode"]),
+                                Csv(reader["Good"]),
+                                Csv(reader["ProducerName"]),
+                                Csv(reader["Qty"]),
+                                Csv(reader["Price"]),
+                                Csv(reader["Sum"]),
+                                Csv(reader["BestBefore"]),
+                                Csv(reader["Serial"])));
+                        }
+                    }
+                }
+
+                // UTF-8 BOM — Excel корректно открывает кириллицу.
+                File.WriteAllText(filePath, sb.ToString(), new UTF8Encoding(encoderShouldEmitUTF8Identifier: true));
+                AppDebugLog.Info("InvoiceExport", $"Накладная {header.Number} экспортирована: {filePath}");
+                return filePath;
+            }
+        }
+
+        public static string ResolveExportFolder(IWin32Window owner = null)
+        {
+            var folder = AppConfig.InvoiceExportPath;
+            if (!string.IsNullOrWhiteSpace(folder) && Directory.Exists(folder))
+            {
+                return folder;
+            }
+
+            using (var dialog = new FolderBrowserDialog())
+            {
+                dialog.Description = "Выберите папку для экспорта накладных";
+                dialog.ShowNewFolderButton = true;
+                if (!string.IsNullOrWhiteSpace(folder) && Directory.Exists(folder))
+                {
+                    dialog.SelectedPath = folder;
+                }
+
+                if (dialog.ShowDialog(owner) != DialogResult.OK || string.IsNullOrWhiteSpace(dialog.SelectedPath))
+                {
+                    return string.Empty;
+                }
+
+                AppConfig.SetInvoiceExportPath(dialog.SelectedPath);
+                return dialog.SelectedPath;
+            }
+        }
+
+        private static InvoiceHeader LoadHeader(SQLiteConnection con, string invoiceId)
+        {
+            using (var cmd = new SQLiteCommand(@"
+select
+    ifnull([InvoiceNumber], '') as [Number],
+    ifnull([InvoiceDate], '') as [Date],
+    ifnull([SupplierName], '') as [Supplier],
+    ifnull([ConsigneesName], '') as [Consignee],
+    ifnull([SourceOrderNumber], '') as [OrderNumber],
+    ifnull([InvoiceSum], ifnull([SumWithNDS], 0)) as [Sum]
+from [Invoice]
+where [idInvoice] = @invoiceId
+limit 1;", con))
+            {
+                cmd.Parameters.AddWithValue("@invoiceId", invoiceId);
+                using (var reader = cmd.ExecuteReader())
+                {
+                    if (!reader.Read())
+                    {
+                        throw new InvalidOperationException("Накладная не найдена.");
+                    }
+
+                    return new InvoiceHeader
+                    {
+                        Number = reader["Number"]?.ToString() ?? string.Empty,
+                        Date = reader["Date"]?.ToString() ?? string.Empty,
+                        Supplier = reader["Supplier"]?.ToString() ?? string.Empty,
+                        Consignee = reader["Consignee"]?.ToString() ?? string.Empty,
+                        OrderNumber = reader["OrderNumber"]?.ToString() ?? string.Empty,
+                        Sum = reader["Sum"]?.ToString() ?? "0"
+                    };
+                }
+            }
+        }
+
+        private static string BuildFileName(InvoiceHeader header)
+        {
+            var number = SanitizeFileName(string.IsNullOrWhiteSpace(header.Number) ? "invoice" : header.Number);
+            var stamp = DateTime.Now.ToString("yyyyMMdd-HHmmss", CultureInfo.InvariantCulture);
+            return $"Накладная_{number}_{stamp}.csv";
+        }
+
+        private static string SanitizeFileName(string value)
+        {
+            foreach (var c in Path.GetInvalidFileNameChars())
+            {
+                value = value.Replace(c, '_');
+            }
+
+            return value.Trim();
+        }
+
+        private static string Csv(object value)
+        {
+            var text = value?.ToString() ?? string.Empty;
+            if (text.IndexOfAny(new[] { ';', '"', '\r', '\n' }) >= 0)
+            {
+                return "\"" + text.Replace("\"", "\"\"") + "\"";
+            }
+
+            return text;
+        }
+
+        private sealed class InvoiceHeader
+        {
+            public string Number { get; set; }
+            public string Date { get; set; }
+            public string Supplier { get; set; }
+            public string Consignee { get; set; }
+            public string OrderNumber { get; set; }
+            public string Sum { get; set; }
+        }
+    }
+}

src/ElectronicPharmacy/ElectronicPharmacy.csproj

@@ -106,6 +106,7 @@
     <Compile Include="Classes\AppDebugLog.cs" />
     <Compile Include="Classes\DataSender.cs" />
     <Compile Include="Classes\ErrorResponse.cs" />
+    <Compile Include="Classes\InvoiceExportService.cs" />
     <Compile Include="Classes\InvoiceRequestService.cs" />
     <Compile Include="Classes\InvoiceSyncService.cs" />
     <Compile Include="Classes\LoginRequest.cs" />

src/ElectronicPharmacy/HelpForms/HF_DownloadDataFromServer.Designer.cs

@@ -32,17 +32,49 @@
             this.dataGridView1 = new Elfisa.UI.Controls.ModernDataGridView();
             this.DataSetPriceList = new System.Data.DataSet();
             this.btnCloseThis = new Elfisa.UI.Controls.ModernButton();
+            this.lblTitle = new System.Windows.Forms.Label();
+            this.lblProgress = new System.Windows.Forms.Label();
+            this.progressDownload = new System.Windows.Forms.ProgressBar();
             ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
             ((System.ComponentModel.ISupportInitialize)(this.DataSetPriceList)).BeginInit();
             this.SuspendLayout();
             // 
+            // lblTitle
+            // 
+            this.lblTitle.AutoSize = true;
+            this.lblTitle.Font = new System.Drawing.Font("Segoe UI Semibold", 12F, System.Drawing.FontStyle.Bold);
+            this.lblTitle.Location = new System.Drawing.Point(22, 14);
+            this.lblTitle.Name = "lblTitle";
+            this.lblTitle.Size = new System.Drawing.Size(220, 28);
+            this.lblTitle.TabIndex = 5;
+            this.lblTitle.Text = "Загрузка прайс-листа";
+            // 
+            // progressDownload
+            // 
+            this.progressDownload.Location = new System.Drawing.Point(25, 52);
+            this.progressDownload.Name = "progressDownload";
+            this.progressDownload.Size = new System.Drawing.Size(630, 22);
+            this.progressDownload.Style = System.Windows.Forms.ProgressBarStyle.Continuous;
+            this.progressDownload.Maximum = 100;
+            this.progressDownload.TabIndex = 6;
+            // 
+            // lblProgress
+            // 
+            this.lblProgress.AutoEllipsis = true;
+            this.lblProgress.Font = new System.Drawing.Font("Segoe UI", 10F);
+            this.lblProgress.Location = new System.Drawing.Point(25, 82);
+            this.lblProgress.Name = "lblProgress";
+            this.lblProgress.Size = new System.Drawing.Size(630, 24);
+            this.lblProgress.TabIndex = 7;
+            this.lblProgress.Text = "Подготовка...";
+            // 
             // rtxtDebug
             // 
             this.rtxtDebug.BackColor = System.Drawing.SystemColors.Control;
             this.rtxtDebug.BorderStyle = System.Windows.Forms.BorderStyle.None;
-            this.rtxtDebug.Location = new System.Drawing.Point(25, 12);
+            this.rtxtDebug.Location = new System.Drawing.Point(25, 116);
             this.rtxtDebug.Name = "rtxtDebug";
-            this.rtxtDebug.Size = new System.Drawing.Size(630, 319);
+            this.rtxtDebug.Size = new System.Drawing.Size(630, 215);
             this.rtxtDebug.TabIndex = 0;
             this.rtxtDebug.Text = "";
             // 
@@ -79,6 +111,9 @@
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.BackColor = System.Drawing.SystemColors.Control;
             this.ClientSize = new System.Drawing.Size(684, 396);
+            this.Controls.Add(this.lblProgress);
+            this.Controls.Add(this.progressDownload);
+            this.Controls.Add(this.lblTitle);
             this.Controls.Add(this.btnCloseThis);
             this.Controls.Add(this.dataGridView1);
             this.Controls.Add(this.rtxtDebug);
@@ -93,7 +128,7 @@
             ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
             ((System.ComponentModel.ISupportInitialize)(this.DataSetPriceList)).EndInit();
             this.ResumeLayout(false);
-
+            this.PerformLayout();
         }
 
         #endregion
@@ -102,5 +137,8 @@
         private Elfisa.UI.Controls.ModernDataGridView dataGridView1;
         private System.Data.DataSet DataSetPriceList;
         private Elfisa.UI.Controls.ModernButton btnCloseThis;
+        private System.Windows.Forms.Label lblTitle;
+        private System.Windows.Forms.Label lblProgress;
+        private System.Windows.Forms.ProgressBar progressDownload;
     }
-}
+}

src/ElectronicPharmacy/HelpForms/HF_DownloadDataFromServer.cs

@@ -12,6 +12,11 @@ namespace Электронная_Фармация.HelpForms
 {
     public partial class HF_DownloadDataFromServer : Form
     {
+        // Доли общего прогресса 0..100.
+        private const int DownloadPhaseEnd = 45;
+        private const int BuildPhaseEnd = 55;
+        private const int SavePhaseEnd = 100;
+
         public HF_DownloadDataFromServer()
         {
             InitializeComponent();
@@ -20,6 +25,7 @@ namespace Электронная_Фармация.HelpForms
         private readonly string _login = Settings.Default.stringLogin ?? string.Empty;
         private readonly string _password = Settings.Default.stringPassword ?? string.Empty;
         private readonly string _connectionStringToLocalDb = AppConfig.SqliteConnectionString;
+        private bool _isDownloading;
 
         private async void HF_DownloadDataFromServer_Load(object sender, EventArgs e)
         {
@@ -28,6 +34,8 @@ namespace Электронная_Фармация.HelpForms
             dataGridView1.Visible = false;
             rtxtDebug.Visible = true;
             rtxtDebug.ReadOnly = true;
+            _isDownloading = true;
+            SetOverallProgress(0, "Подключение к серверу...");
 
             var client = new ApiClient();
             AppendStatus($"Сервер: {client.BaseUrl}");
@@ -36,39 +44,67 @@ namespace Электронная_Фармация.HelpForms
 
             try
             {
+                SetOverallProgress(1, "Авторизация...");
                 await EnsureAuthenticatedAsync(client);
 
-                AppendStatus("Загружаю сводный прайс (постранично, весь)...");
+                SetOverallProgress(3, "Загрузка прайса с сервера...");
+                AppendStatus("Загружаю сводный прайс...");
                 var allSuppliersSummary = await GetFullPriceSummaryPagedAsync(client);
-                AppendStatus($"Получено {allSuppliersSummary.Summary?.Count ?? 0} позиций");
+                int totalItems = allSuppliersSummary.Summary?.Count ?? 0;
+                AppendStatus($"Получено {totalItems} позиций");
+                SetOverallProgress(DownloadPhaseEnd, $"Получено {totalItems} / {totalItems} позиций (100%)");
 
-                var tablePrice = BuildPriceTable(allSuppliersSummary);
+                SetOverallProgress(DownloadPhaseEnd, "Подготовка таблицы...");
-                SavePriceTable(tablePrice);
+                var buildProgress = new Progress<CountProgress>(p =>
+                {
+                    int phasePercent = MapPhasePercent(p.Current, p.Total, DownloadPhaseEnd, BuildPhaseEnd);
+                    SetOverallProgress(
+                        phasePercent,
+                        $"Обработка: {p.Current} / {p.Total} ({PercentOf(p.Current, p.Total)}%)");
+                });
+                var tablePrice = await Task.Run(() => BuildPriceTable(allSuppliersSummary, buildProgress));
 
+                SetOverallProgress(BuildPhaseEnd, "Сохранение в локальную базу...");
+                var saveProgress = new Progress<CountProgress>(p =>
+                {
+                    int phasePercent = MapPhasePercent(p.Current, p.Total, BuildPhaseEnd, SavePhaseEnd);
+                    SetOverallProgress(
+                        phasePercent,
+                        $"Сохранение: {p.Current} / {p.Total} ({PercentOf(p.Current, p.Total)}%)");
+                });
+                await Task.Run(() => SavePriceTable(tablePrice, saveProgress));
+
+                SetOverallProgress(100, $"Готово: {tablePrice.Rows.Count} / {tablePrice.Rows.Count} (100%)");
                 DialogResult = DialogResult.OK;
                 AppendStatus($"Готово. Сохранено {tablePrice.Rows.Count} позиций в локальную базу.");
                 ToastNotification.ShowSuccess($"Прайс обновлён: {tablePrice.Rows.Count} позиций");
             }
             catch (UnauthorizedAccessException ex)
             {
+                SetOverallProgress(0, "Ошибка авторизации");
                 AppendStatus($"Ошибка авторизации: {ex.Message}");
                 AppDebugLog.Error("Download", "Ошибка авторизации при загрузке прайса", ex);
                 ToastNotification.ShowError($"Ошибка авторизации: {ex.Message}");
             }
             catch (HttpRequestException ex)
             {
+                SetOverallProgress(0, "Ошибка сети");
                 AppendStatus($"Ошибка сети: {ex.Message}");
                 AppDebugLog.Error("Download", "Ошибка сети при загрузке прайса", ex);
                 ToastNotification.ShowError($"Ошибка сети: {ex.Message}");
             }
             catch (Exception ex)
             {
+                SetOverallProgress(0, "Ошибка загрузки");
                 AppendStatus($"Ошибка загрузки прайса: {ex.Message}");
                 AppDebugLog.Error("Download", "Неожиданная ошибка при загрузке прайса", ex);
                 ToastNotification.ShowError($"Ошибка загрузки прайса: {ex.Message}");
             }
-
+            finally
-            btnCloseThis.Enabled = true;
+            {
+                _isDownloading = false;
+                btnCloseThis.Enabled = true;
+            }
         }
 
         private async Task EnsureAuthenticatedAsync(ApiClient client)
@@ -98,39 +134,51 @@ namespace Электронная_Фармация.HelpForms
             AppendStatus("Авторизация успешно пройдена");
         }
 
-        // Тянем весь прайс постранично: сервер отдаёт максимум 5000 за запрос,
-        // поэтому идём offset'ом, пока страница не окажется неполной.
         private async Task<PriceSummaryResponse> GetFullPriceSummaryPagedAsync(ApiClient client)
         {
             var regionId = string.IsNullOrWhiteSpace(Settings.Default.RegionId)
                 ? null
                 : Settings.Default.RegionId;
 
-            // Тянем весь прайс одним запросом: постраничный OFFSET на тяжёлом
+            // Один крупный запрос (OFFSET на больших страницах валит сервер).
-            // сводном запросе валит сервер на глубоких страницах. Один запрос =
-            // один расчёт выборки. Страховка-цикл остаётся на случай, если позиций
-            // окажется больше pageSize.
             const int pageSize = 200000;
             const int maxPages = 100;
 
             var combined = new PriceSummaryResponse { Summary = new List<PriceSummaryItem>() };
+            var transferProgress = new Progress<HttpTransferProgress>(ReportTransferProgress);
 
             for (int page = 0; page < maxPages; page++)
             {
                 int offset = page * pageSize;
+                SetOverallProgress(
+                    Math.Min(DownloadPhaseEnd - 1, 3 + page),
+                    page == 0 ? "Скачивание прайса с сервера..." : $"Скачивание страницы {page + 1}...");
+
                 PriceSummaryResponse chunk;
                 try
                 {
-                    chunk = await client.GetPriceSummaryAsync(supplierId: null, regionId: regionId, limit: pageSize, offset: offset);
+                    chunk = await client.GetPriceSummaryAsync(
+                        supplierId: null,
+                        regionId: regionId,
+                        limit: pageSize,
+                        offset: offset,
+                        transferProgress: transferProgress);
                 }
                 catch (UnauthorizedAccessException)
                 {
                     AppendStatus("Токен недействителен, повторная авторизация...");
+                    SetOverallProgress(2, "Повторная авторизация...");
                     Settings.Default.stringToken = string.Empty;
                     Settings.Default.Save();
                     client.SetToken(null);
                     await LoginAndSaveTokenAsync(client);
-                    chunk = await client.GetPriceSummaryAsync(supplierId: null, regionId: regionId, limit: pageSize, offset: offset);
+                    SetOverallProgress(3, "Повторная загрузка прайса...");
+                    chunk = await client.GetPriceSummaryAsync(
+                        supplierId: null,
+                        regionId: regionId,
+                        limit: pageSize,
+                        offset: offset,
+                        transferProgress: transferProgress);
                 }
 
                 int got = chunk?.Summary?.Count ?? 0;
@@ -142,14 +190,33 @@ namespace Электронная_Фармация.HelpForms
 
                 if (got < pageSize)
                 {
-                    break; // последняя (неполная) страница — дальше данных нет
+                    break;
                 }
             }
 
             return combined;
         }
 
-        private static DataTable BuildPriceTable(PriceSummaryResponse allSuppliersSummary)
+        private void ReportTransferProgress(HttpTransferProgress transfer)
+        {
+            if (transfer.TotalBytes.HasValue && transfer.TotalBytes.Value > 0)
+            {
+                int phasePercent = MapPhasePercent(transfer.BytesReceived, transfer.TotalBytes.Value, 3, DownloadPhaseEnd);
+                SetOverallProgress(
+                    phasePercent,
+                    $"Скачивание: {FormatBytes(transfer.BytesReceived)} / {FormatBytes(transfer.TotalBytes.Value)} ({transfer.Percent}%)");
+            }
+            else
+            {
+                SetOverallProgress(
+                    Math.Min(DownloadPhaseEnd - 1, 5),
+                    $"Скачивание: получено {FormatBytes(transfer.BytesReceived)}...");
+            }
+        }
+
+        private static DataTable BuildPriceTable(
+            PriceSummaryResponse allSuppliersSummary,
+            IProgress<CountProgress> progress = null)
         {
             var tablePrice = new DataTable();
             tablePrice.Columns.Add("supplier_price_id");
@@ -192,6 +259,8 @@ namespace Электронная_Фармация.HelpForms
                 return tablePrice;
             }
 
+            int total = allSuppliersSummary.Summary.Count;
+            int current = 0;
             foreach (var item in allSuppliersSummary.Summary)
             {
                 var row = tablePrice.NewRow();
@@ -210,12 +279,18 @@ namespace Электронная_Фармация.HelpForms
                 row["TradeName"] = string.IsNullOrWhiteSpace(item.TradeName) ? (object)DBNull.Value : item.TradeName.Trim();
                 row["Dosage"] = string.IsNullOrWhiteSpace(item.Dosage) ? (object)DBNull.Value : item.Dosage.Trim();
                 tablePrice.Rows.Add(row);
+
+                current++;
+                if (progress != null && (current % 500 == 0 || current == total))
+                {
+                    progress.Report(new CountProgress(current, total));
+                }
             }
 
             return tablePrice;
         }
 
-        private void SavePriceTable(DataTable tablePrice)
+        private void SavePriceTable(DataTable tablePrice, IProgress<CountProgress> progress = null)
         {
             const string commandToDelete = "delete from [PriceList]";
             const string commandToDeleteTempOrder = "delete from [TempOrderItems]";
@@ -253,6 +328,7 @@ VALUES
 @Dosage
 )";
 
+            int total = tablePrice.Rows.Count;
             using (var sqliteCon = new SQLiteConnection(_connectionStringToLocalDb))
             {
                 sqliteCon.Open();
@@ -266,6 +342,7 @@ VALUES
 
                 using (var transaction = sqliteCon.BeginTransaction())
                 {
+                    int saved = 0;
                     foreach (DataRow row in tablePrice.Rows)
                     {
                         using (var cmd = new SQLiteCommand(commandToInsert, sqliteCon, transaction))
@@ -286,6 +363,12 @@ VALUES
                             cmd.Parameters.AddWithValue("@Dosage", row.Table.Columns.Contains("Dosage") ? row["Dosage"] : DBNull.Value);
                             cmd.ExecuteNonQuery();
                         }
+
+                        saved++;
+                        if (progress != null && (saved % 250 == 0 || saved == total))
+                        {
+                            progress.Report(new CountProgress(saved, total));
+                        }
                     }
 
                     transaction.Commit();
@@ -293,6 +376,68 @@ VALUES
             }
         }
 
+        private static int MapPhasePercent(long current, long total, int phaseStart, int phaseEnd)
+        {
+            if (total <= 0)
+            {
+                return phaseStart;
+            }
+
+            double ratio = Math.Max(0.0, Math.Min(1.0, (double)current / total));
+            return phaseStart + (int)((phaseEnd - phaseStart) * ratio);
+        }
+
+        private static int PercentOf(long current, long total)
+        {
+            if (total <= 0)
+            {
+                return 0;
+            }
+
+            return (int)Math.Max(0, Math.Min(100, (100.0 * current) / total));
+        }
+
+        private static string FormatBytes(long bytes)
+        {
+            if (bytes < 1024)
+            {
+                return $"{bytes} Б";
+            }
+
+            if (bytes < 1024 * 1024)
+            {
+                return $"{bytes / 1024.0:0.0} КБ";
+            }
+
+            return $"{bytes / (1024.0 * 1024.0):0.00} МБ";
+        }
+
+        private void SetOverallProgress(int percent, string text)
+        {
+            if (IsDisposed)
+            {
+                return;
+            }
+
+            if (InvokeRequired)
+            {
+                BeginInvoke(new Action<int, string>(SetOverallProgress), percent, text);
+                return;
+            }
+
+            if (progressDownload.Style != ProgressBarStyle.Continuous)
+            {
+                progressDownload.Style = ProgressBarStyle.Continuous;
+            }
+
+            progressDownload.Minimum = 0;
+            progressDownload.Maximum = 100;
+            progressDownload.Value = Math.Max(0, Math.Min(100, percent));
+            lblProgress.Text = $"{Math.Max(0, Math.Min(100, percent))}% — {text}";
+            lblProgress.Refresh();
+            progressDownload.Refresh();
+        }
+
         private void AppendStatus(string message)
         {
             if (InvokeRequired)
@@ -310,13 +455,27 @@ VALUES
 
         private void HF_DownloadDataFromServer_FormClosing(object sender, FormClosingEventArgs e)
         {
-            Dispose();
+            if (_isDownloading)
-            Close();
+            {
+                e.Cancel = true;
+            }
         }
 
         private void btnCloseThis_Click(object sender, EventArgs e)
         {
             Close();
         }
+
+        private sealed class CountProgress
+        {
+            public CountProgress(int current, int total)
+            {
+                Current = current;
+                Total = total;
+            }
+
+            public int Current { get; }
+            public int Total { get; }
+        }
     }
 }

src/ElectronicPharmacy/HelpForms/HF_Registration.Designer.cs

@@ -40,6 +40,9 @@
             this.label3 = new System.Windows.Forms.Label();
             this.label5 = new System.Windows.Forms.Label();
             this.txtApiUrl = new Elfisa.UI.Controls.ModernTextBox();
+            this.labelExportPath = new System.Windows.Forms.Label();
+            this.txtInvoiceExportPath = new Elfisa.UI.Controls.ModernTextBox();
+            this.btnBrowseExportPath = new Elfisa.UI.Controls.ModernButton();
             this.panel1.SuspendLayout();
             this.SuspendLayout();
             // 
@@ -79,9 +82,55 @@
             this.txtPassword.Size = new System.Drawing.Size(375, 34);
             this.txtPassword.TabIndex = 3;
             // 
+            // label5
+            // 
+            this.label5.AutoSize = true;
+            this.label5.Font = new System.Drawing.Font("Segoe UI", 12F);
+            this.label5.Location = new System.Drawing.Point(23, 225);
+            this.label5.Name = "label5";
+            this.label5.Size = new System.Drawing.Size(103, 28);
+            this.label5.TabIndex = 11;
+            this.label5.Text = "URL API";
+            // 
+            // txtApiUrl
+            // 
+            this.txtApiUrl.Font = new System.Drawing.Font("Segoe UI", 12F);
+            this.txtApiUrl.Location = new System.Drawing.Point(132, 225);
+            this.txtApiUrl.Name = "txtApiUrl";
+            this.txtApiUrl.Size = new System.Drawing.Size(271, 34);
+            this.txtApiUrl.TabIndex = 12;
+            // 
+            // labelExportPath
+            // 
+            this.labelExportPath.AutoSize = true;
+            this.labelExportPath.Font = new System.Drawing.Font("Segoe UI", 12F);
+            this.labelExportPath.Location = new System.Drawing.Point(23, 272);
+            this.labelExportPath.Name = "labelExportPath";
+            this.labelExportPath.Size = new System.Drawing.Size(280, 28);
+            this.labelExportPath.TabIndex = 13;
+            this.labelExportPath.Text = "Папка экспорта накладных";
+            // 
+            // txtInvoiceExportPath
+            // 
+            this.txtInvoiceExportPath.Font = new System.Drawing.Font("Segoe UI", 10F);
+            this.txtInvoiceExportPath.Location = new System.Drawing.Point(28, 304);
+            this.txtInvoiceExportPath.Name = "txtInvoiceExportPath";
+            this.txtInvoiceExportPath.Size = new System.Drawing.Size(320, 30);
+            this.txtInvoiceExportPath.TabIndex = 14;
+            // 
+            // btnBrowseExportPath
+            // 
+            this.btnBrowseExportPath.Font = new System.Drawing.Font("Segoe UI Semibold", 10F, System.Drawing.FontStyle.Bold);
+            this.btnBrowseExportPath.Location = new System.Drawing.Point(354, 304);
+            this.btnBrowseExportPath.Name = "btnBrowseExportPath";
+            this.btnBrowseExportPath.Size = new System.Drawing.Size(49, 30);
+            this.btnBrowseExportPath.TabIndex = 15;
+            this.btnBrowseExportPath.Text = "...";
+            this.btnBrowseExportPath.Click += new System.EventHandler(this.btnBrowseExportPath_Click);
+            // 
             // btnConfirmRegistration
             // 
-            this.btnConfirmRegistration.Location = new System.Drawing.Point(188, 300);
+            this.btnConfirmRegistration.Location = new System.Drawing.Point(188, 356);
             this.btnConfirmRegistration.Name = "btnConfirmRegistration";
             this.btnConfirmRegistration.Size = new System.Drawing.Size(215, 43);
             this.btnConfirmRegistration.TabIndex = 5;
@@ -90,7 +139,7 @@
             // 
             // btnCloseThis
             // 
-            this.btnCloseThis.Location = new System.Drawing.Point(28, 300);
+            this.btnCloseThis.Location = new System.Drawing.Point(28, 356);
             this.btnCloseThis.Name = "btnCloseThis";
             this.btnCloseThis.Size = new System.Drawing.Size(125, 43);
             this.btnCloseThis.TabIndex = 6;
@@ -102,7 +151,7 @@
             this.checkTokenGained.AutoCheck = false;
             this.checkTokenGained.AutoSize = true;
             this.checkTokenGained.Font = new System.Drawing.Font("Segoe UI", 12F);
-            this.checkTokenGained.Location = new System.Drawing.Point(28, 260);
+            this.checkTokenGained.Location = new System.Drawing.Point(28, 420);
             this.checkTokenGained.Name = "checkTokenGained";
             this.checkTokenGained.Size = new System.Drawing.Size(171, 32);
             this.checkTokenGained.TabIndex = 7;
@@ -133,29 +182,14 @@
             this.label3.Text = "АВТОРИЗАЦИЯ";
             this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
             // 
-            // label5
-            // 
-            this.label5.AutoSize = true;
-            this.label5.Font = new System.Drawing.Font("Segoe UI", 12F);
-            this.label5.Location = new System.Drawing.Point(23, 225);
-            this.label5.Name = "label5";
-            this.label5.Size = new System.Drawing.Size(103, 28);
-            this.label5.TabIndex = 11;
-            this.label5.Text = "URL API";
-            // 
-            // txtApiUrl
-            // 
-            this.txtApiUrl.Font = new System.Drawing.Font("Segoe UI", 12F);
-            this.txtApiUrl.Location = new System.Drawing.Point(132, 225);
-            this.txtApiUrl.Name = "txtApiUrl";
-            this.txtApiUrl.Size = new System.Drawing.Size(271, 34);
-            this.txtApiUrl.TabIndex = 12;
-            // 
             // HF_Registration
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-            this.ClientSize = new System.Drawing.Size(436, 360);
+            this.ClientSize = new System.Drawing.Size(436, 420);
+            this.Controls.Add(this.btnBrowseExportPath);
+            this.Controls.Add(this.txtInvoiceExportPath);
+            this.Controls.Add(this.labelExportPath);
             this.Controls.Add(this.txtApiUrl);
             this.Controls.Add(this.label5);
             this.Controls.Add(this.panel1);
@@ -192,5 +226,8 @@
         private System.Windows.Forms.Label label3;
         private System.Windows.Forms.Label label5;
         private Elfisa.UI.Controls.ModernTextBox txtApiUrl;
+        private System.Windows.Forms.Label labelExportPath;
+        private Elfisa.UI.Controls.ModernTextBox txtInvoiceExportPath;
+        private Elfisa.UI.Controls.ModernButton btnBrowseExportPath;
     }
 }

src/ElectronicPharmacy/HelpForms/HF_Registration.cs

@@ -25,6 +25,27 @@ namespace Электронная_Фармация.HelpForms
             Close();
         }
 
+        private void btnBrowseExportPath_Click(object sender, EventArgs e)
+        {
+            using (var dialog = new FolderBrowserDialog())
+            {
+                dialog.Description = "Выберите папку для экспорта накладных";
+                dialog.ShowNewFolderButton = true;
+                if (!string.IsNullOrWhiteSpace(txtInvoiceExportPath.Text)
+                    && System.IO.Directory.Exists(txtInvoiceExportPath.Text.Trim()))
+                {
+                    dialog.SelectedPath = txtInvoiceExportPath.Text.Trim();
+                }
+
+                if (dialog.ShowDialog(this) == DialogResult.OK)
+                {
+                    txtInvoiceExportPath.Text = dialog.SelectedPath;
+                    AppConfig.SetInvoiceExportPath(dialog.SelectedPath);
+                    ToastNotification.ShowSuccess("Папка экспорта накладных сохранена");
+                }
+            }
+        }
+
         private async void btnConfirmRegistration_Click(object sender, EventArgs e)
         {
             btnConfirmRegistration.Enabled = false;
@@ -39,6 +60,7 @@ namespace Электронная_Фармация.HelpForms
                 // на старый сохранённый/дефолтный адрес, а не на введённый пользователем.
                 string apiUrl = txtApiUrl.Text.Trim();
                 Settings.Default.ApiBaseUrl = apiUrl;
+                AppConfig.SetInvoiceExportPath(txtInvoiceExportPath.Text);
                 Settings.Default.Save();
 
                 LoginRequest loginRequest = new LoginRequest();
@@ -56,6 +78,7 @@ namespace Электронная_Фармация.HelpForms
                     Settings.Default.stringPassword = strPassword;
                     Settings.Default.stringToken = token;
                     Settings.Default.ApiBaseUrl = client.BaseUrl;
+                    AppConfig.SetInvoiceExportPath(txtInvoiceExportPath.Text);
                     Settings.Default.Save();
 
                     AppDebugLog.Info("Auth", $"Авторизация успешна. token={AppDebugLog.MaskToken(token)}");
@@ -104,6 +127,7 @@ namespace Электронная_Фармация.HelpForms
             txtApiUrl.Text = string.IsNullOrWhiteSpace(Settings.Default.ApiBaseUrl)
                 ? AppConfig.DefaultApiBaseUrl
                 : Settings.Default.ApiBaseUrl;
+            txtInvoiceExportPath.Text = AppConfig.InvoiceExportPath;
 
             checkTokenGained.Checked = doWeHaveAToken.Length > 0;
         }

src/ElectronicPharmacy/Properties/Settings.Designer.cs

@@ -119,5 +119,17 @@ namespace Электронная_Фармация.Properties {
             }
         }
 
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("")]
+        public string InvoiceExportPath {
+            get {
+                return ((string)(this["InvoiceExportPath"]));
+            }
+            set {
+                this["InvoiceExportPath"] = value;
+            }
+        }
+
     }
 }

src/ElectronicPharmacy/Properties/Settings.settings

@@ -26,5 +26,8 @@
     <Setting Name="UseDarkTheme" Type="System.Boolean" Scope="User">
       <Value Profile="(Default)">False</Value>
     </Setting>
+    <Setting Name="InvoiceExportPath" Type="System.String" Scope="User">
+      <Value Profile="(Default)" />
+    </Setting>
   </Settings>
 </SettingsFile>

src/ElectronicPharmacy/UserControls/UCInvoices.cs

@@ -406,7 +406,7 @@ where date(i.[InvoiceDate]) between date(@dateFrom) and date(@dateTo)";
                 return;
             }
 
-            _exportInvoiceMenuItem = new ToolStripMenuItem("Экспорт");
+            _exportInvoiceMenuItem = new ToolStripMenuItem("Экспортировать в папку");
             _exportInvoiceMenuItem.Click += (_, __) => ExportSelectedInvoice();
 
             _invoiceMenu = new ContextMenuStrip();
@@ -547,11 +547,27 @@ where ii.idInvoice = @invoiceId;";
                 return;
             }
 
-            var invoiceNumber = dgvInvoice.SelectedRows[0].Cells["Номер"]?.Value?.ToString() ?? string.Empty;
+            var row = dgvInvoice.SelectedRows[0];
-            ToastNotification.ShowCustom(
+            var invoiceId = row.Cells["ИД накладной"]?.Value?.ToString() ?? string.Empty;
-                $"Экспорт накладной {invoiceNumber} будет добавлен после согласования формата.",
+            var invoiceNumber = row.Cells["Номер"]?.Value?.ToString() ?? string.Empty;
-                Color.SteelBlue,
+
-                Color.White);
+            if (string.IsNullOrWhiteSpace(invoiceId))
+            {
+                ToastNotification.ShowCustom("Не удалось определить накладную для экспорта.", Color.DarkOrange, Color.White);
+                return;
+            }
+
+            try
+            {
+                var exportService = new InvoiceExportService();
+                var filePath = exportService.ExportInvoice(invoiceId, FindForm());
+                ToastNotification.ShowSuccess($"Накладная {invoiceNumber} сохранена:\n{filePath}");
+            }
+            catch (Exception ex)
+            {
+                AppDebugLog.Error("Invoices", $"Ошибка экспорта накладной {invoiceNumber}", ex);
+                ToastNotification.ShowError($"Не удалось экспортировать накладную: {ex.Message}");
+            }
         }
 
         private void txtInvoiceNumber_KeyPress(object sender, KeyPressEventArgs e)