Export training plan as one continuous PDF page

src/TrainingPlanner.Infrastructure/Pdf/ContinuousPdfLayout.cs

@@ -0,0 +1,20 @@
+using MigraDoc.DocumentObjectModel;
+using MigraDoc.Rendering;
+
+namespace TrainingPlanner.Infrastructure.Pdf;
+
+public class ContinuousPdfLayout(PdfOptions options)
+{
+    public void Fit(Document document)
+    {
+        var measurement = new DocumentRenderer(document.Clone());
+        measurement.PrepareDocument();
+        if (measurement.FormattedDocument?.PageCount != 1)
+            throw new InvalidOperationException("Программа слишком длинная для одной страницы PDF. Сократите её объём.");
+        var elements = measurement.GetRenderInfoFromPage(1)
+            ?? throw new InvalidOperationException("Не удалось рассчитать высоту PDF.");
+        var contentBottom = elements.Max(info => info.LayoutInfo.ContentArea.Y.Point + info.LayoutInfo.ContentArea.Height.Point);
+        document.Sections[0].PageSetup.PageHeight = Unit.FromPoint(
+            Math.Ceiling(contentBottom + Unit.FromCentimeter(options.MarginCentimeters).Point));
+    }
+}

src/TrainingPlanner.Infrastructure/Pdf/PdfOptions.cs

@@ -8,6 +8,8 @@ public class PdfOptions
     public double FontSize { get; set; }
     public double CameraSizePoints { get; set; }
     public double HeadingSize { get; set; }
+    public double PageWidthCentimeters { get; set; }
+    public double MaxContinuousPageHeightCentimeters { get; set; }
     public double MarginCentimeters { get; set; }
     public double ClientLabelWidthCentimeters { get; set; }
     public int ClientDetailsGapLines { get; set; }

src/TrainingPlanner.Infrastructure/Pdf/PdfWeekTableBuilder.cs

@@ -33,6 +33,12 @@ public class PdfWeekTableBuilder(PdfOptions options)
             "Отдых, мин", "Съёмка", "Время тренировки" };
         for (var index = 0; index < labels.Length; index++)
             header.Cells[index].AddParagraph(labels[index]);
+        if (week.Workouts.Count == 0)
+        {
+            var empty = table.AddRow();
+            empty.Cells[0].MergeRight = table.Columns.Count - 1;
+            empty.Cells[0].AddParagraph("Тренировки не назначены.");
+        }
         foreach (var workout in week.Workouts)
             AddWorkout(table, workout);
         for (var rowIndex = 0; rowIndex < table.Rows.Count; rowIndex++)

src/TrainingPlanner.Infrastructure/Pdf/PlanPdfExporter.cs

@@ -26,34 +26,23 @@ public class PlanPdfExporter : IPlanPdfExporter
         normal.Font.Name = options.FontFamily;
         normal.Font.Size = options.FontSize;
         normal.ParagraphFormat.SpaceAfter = Unit.FromPoint(options.FontSize / 2);
-        var firstWeek = true;
-        foreach (var week in plan.Weeks)
+        var section = document.AddSection();
+        section.PageSetup.PageWidth = Unit.FromCentimeter(options.PageWidthCentimeters);
+        section.PageSetup.PageHeight = Unit.FromCentimeter(options.MaxContinuousPageHeightCentimeters);
+        section.PageSetup.TopMargin = section.PageSetup.BottomMargin = Unit.FromCentimeter(options.MarginCentimeters);
+        section.PageSetup.LeftMargin = section.PageSetup.RightMargin = Unit.FromCentimeter(options.MarginCentimeters);
+        new PdfClientTableBuilder(options).Add(section, client);
+        for (var line = 0; line < options.ClientDetailsGapLines; line++)
         {
-            var section = document.AddSection();
-            section.PageSetup.PageFormat = PageFormat.A4;
-            section.PageSetup.Orientation = Orientation.Landscape;
-            section.PageSetup.TopMargin = section.PageSetup.BottomMargin = Unit.FromCentimeter(options.MarginCentimeters);
-            section.PageSetup.LeftMargin = section.PageSetup.RightMargin = Unit.FromCentimeter(options.MarginCentimeters);
-            if (firstWeek)
-            {
-                new PdfClientTableBuilder(options).Add(section, client);
-                for (var line = 0; line < options.ClientDetailsGapLines; line++)
-                {
-                    var spacer = section.AddParagraph();
-                    spacer.Format.SpaceBefore = Unit.FromPoint(0);
-                    spacer.Format.SpaceAfter = Unit.FromPoint(0);
-                    spacer.Format.LineSpacingRule = LineSpacingRule.Single;
-                }
-                firstWeek = false;
-            }
-            var footer = section.Footers.Primary.AddParagraph();
-            footer.Format.Alignment = ParagraphAlignment.Right;
-            footer.AddPageField();
-            if (week.Workouts.Count == 0)
-                section.AddParagraph($"Неделя {week.Position + 1}. Тренировки не назначены.");
-            else
-                tables.Add(section, week);
+            var spacer = section.AddParagraph();
+            spacer.Format.SpaceBefore = Unit.FromPoint(0);
+            spacer.Format.SpaceAfter = Unit.FromPoint(0);
+            spacer.Format.LineSpacingRule = LineSpacingRule.Single;
         }
+        foreach (var week in plan.Weeks)
+            tables.Add(section, week);
+
+        new ContinuousPdfLayout(options).Fit(document);
         var renderer = new PdfDocumentRenderer { Document = document };
         renderer.RenderDocument();
         using var stream = new MemoryStream();

src/TrainingPlanner.Web/appsettings.json

@@ -68,6 +68,8 @@
     "MaximumReceiveMessageBytes": 1048576
   },
   "Pdf": {
+    "PageWidthCentimeters": 29.7,
+    "MaxContinuousPageHeightCentimeters": 500,
     "ClientDetailsGapLines": 5,
     "ClientLabelWidthCentimeters": 4.5,
     "FontPath": "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",