feat(inventory): local sharing — per-lot share terms, filter and printable catalog

The local half of the original Fase 2 (no network, no Offer entity yet): - Lot sheet gains a 'do you share it?' choice (gift/swap first, sale last, never the default); declaring plenty of abundance reveals it with a nudge. - Lot lines and list tiles badge shared batches; an 'I share' filter and a printable PDF catalog (paper bridge for fairs) round out the view. - Catalog PDF embeds DejaVu (Latin-ext/Cyrillic/Greek); fonts are a per-locale resource like the OCR packs.
2026-07-09 22:19:55 +02:00 · 2026-07-09 22:19:55 +02:00 · ba87bf2719
commit ba87bf2719
parent e3ec855630
20 changed files with 982 additions and 36 deletions
--- a/apps/app_seeds/lib/services/share_catalog_service.dart
+++ b/apps/app_seeds/lib/services/share_catalog_service.dart
@ -0,0 +1,132 @@
+import 'dart:typed_data';
+
+import 'package:flutter/services.dart' show rootBundle;
+import 'package:pdf/pdf.dart';
+import 'package:pdf/widgets.dart' as pw;
+
+import 'file_service.dart';
+
+/// One printable line of the "what I share" catalog. All strings arrive
+/// already localized — this service knows nothing about i18n or the domain.
+class ShareCatalogRow {
+  const ShareCatalogRow({
+    required this.name,
+    required this.mode,
+    this.scientificName,
+    this.details,
+  });
+
+  /// The variety's label, as its keeper writes it.
+  final String name;
+
+  /// Scientific name of the linked species, if any (rendered in italics).
+  final String? scientificName;
+
+  /// The batch facts line ("Seeds · 2024 · 2 cobs"), if any.
+  final String? details;
+
+  /// On what terms it is offered ("To give away" / "To swap" / "For sale").
+  final String mode;
+}
+
+/// Renders the "what I share" catalog as a PDF and hands it to the user via
+/// the save dialog — a paper bridge for fairs and meet-ups, no network needed.
+class ShareCatalogService {
+  ShareCatalogService({required FileService files}) : _files = files;
+
+  final FileService _files;
+
+  /// Builds the catalog PDF. Pure of platform channels apart from loading the
+  /// bundled font, so it runs (and is tested) on the host.
+  ///
+  /// The embedded DejaVu face covers Latin (extended), Cyrillic and Greek.
+  /// Like the OCR traineddata, the PDF font is a per-locale resource: wider
+  /// scripts (Arabic, CJK) ship alongside their locales, not hardcoded here.
+  Future<Uint8List> buildPdf({
+    required String title,
+    required String date,
+    required List<ShareCatalogRow> rows,
+  }) async {
+    final base = pw.Font.ttf(
+      await rootBundle.load('assets/fonts/DejaVuSans.ttf'),
+    );
+    final bold = pw.Font.ttf(
+      await rootBundle.load('assets/fonts/DejaVuSans-Bold.ttf'),
+    );
+    final doc = pw.Document(
+      theme: pw.ThemeData.withFont(base: base, bold: bold, italic: base),
+    );
+    doc.addPage(
+      pw.MultiPage(
+        pageFormat: PdfPageFormat.a4,
+        build: (context) => [
+          pw.Text(title, style: pw.TextStyle(font: bold, fontSize: 20)),
+          pw.SizedBox(height: 2),
+          pw.Text(
+            date,
+            style: const pw.TextStyle(fontSize: 10, color: PdfColors.grey700),
+          ),
+          pw.SizedBox(height: 12),
+          for (final row in rows)
+            pw.Container(
+              padding: const pw.EdgeInsets.symmetric(vertical: 6),
+              decoration: const pw.BoxDecoration(
+                border: pw.Border(
+                  bottom: pw.BorderSide(color: PdfColors.grey300, width: 0.5),
+                ),
+              ),
+              child: pw.Row(
+                crossAxisAlignment: pw.CrossAxisAlignment.start,
+                children: [
+                  pw.Expanded(
+                    child: pw.Column(
+                      crossAxisAlignment: pw.CrossAxisAlignment.start,
+                      children: [
+                        pw.Text(
+                          row.name,
+                          style: pw.TextStyle(font: bold, fontSize: 12),
+                        ),
+                        if (row.scientificName != null)
+                          pw.Text(
+                            row.scientificName!,
+                            style: pw.TextStyle(
+                              fontSize: 10,
+                              fontStyle: pw.FontStyle.italic,
+                              color: PdfColors.grey700,
+                            ),
+                          ),
+                        if (row.details != null)
+                          pw.Text(
+                            row.details!,
+                            style: const pw.TextStyle(fontSize: 10),
+                          ),
+                      ],
+                    ),
+                  ),
+                  pw.SizedBox(width: 8),
+                  pw.Text(row.mode, style: const pw.TextStyle(fontSize: 10)),
+                ],
+              ),
+            ),
+        ],
+      ),
+    );
+    return doc.save();
+  }
+
+  /// Builds the PDF and asks the user where to keep it. Returns true when
+  /// saved, false when they cancelled the dialog.
+  Future<bool> saveCatalog({
+    required String title,
+    required String date,
+    required String suggestedName,
+    required List<ShareCatalogRow> rows,
+  }) async {
+    final bytes = await buildPdf(title: title, date: date, rows: rows);
+    final path = await _files.saveFile(
+      suggestedName: suggestedName,
+      bytes: bytes,
+    );
+    return path != null;
+  }
+}