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lib/services/pdf_service.dart

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+import 'dart:io';
+import 'package:flutter/foundation.dart';
+import 'package:pdf/pdf.dart';
+import 'package:pdf/widgets.dart' as pw;
+import 'package:intl/intl.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:open_filex/open_filex.dart';
+import 'package:universal_html/html.dart' as html;
+
+import '../models/user_profile.dart';
+import '../models/cycle_entry.dart';
+import '../theme/app_theme.dart';
+
+class PdfService {
+  static Future<void> generateCycleReport(UserProfile user, List<CycleEntry> entries) async {
+    final pdf = pw.Document();
+
+    final primaryColor = PdfColor.fromInt(AppColors.sageGreen.value);
+    final accentColor = PdfColor.fromInt(AppColors.rose.value);
+    final textColor = PdfColor.fromInt(AppColors.charcoal.value);
+
+    // Sort entries by date for the report
+    entries.sort((a, b) => a.date.compareTo(b.date));
+
+    pdf.addPage(
+      pw.MultiPage(
+        pageFormat: PdfPageFormat.a4,
+        build: (pw.Context context) => [
+          _buildHeader(user, primaryColor, accentColor, textColor),
+          pw.SizedBox(height: 20),
+          _buildCycleSummary(user, textColor),
+          pw.SizedBox(height: 20),
+          _buildEntriesTable(entries, primaryColor, textColor),
+        ],
+      ),
+    );
+
+    final String fileName = 'cycle_report_${DateFormat('yyyyMMdd').format(DateTime.now())}.pdf';
+
+    if (kIsWeb) {
+      // Web platform
+      final bytes = await pdf.save();
+      final blob = html.Blob([bytes], 'application/pdf');
+      final url = html.Url.createObjectUrlFromBlob(blob);
+      html.AnchorElement(href: url)
+        ..setAttribute('download', fileName)
+        ..click();
+      html.Url.revokeObjectUrl(url);
+    } else {
+      // Mobile platform
+      final directory = await getApplicationDocumentsDirectory();
+      final filePath = '${directory.path}/$fileName';
+      final file = File(filePath);
+      await file.writeAsBytes(await pdf.save());
+      await OpenFilex.open(filePath);
+    }
+  }
+
+  static pw.Widget _buildHeader(UserProfile user, PdfColor primaryColor, PdfColor accentColor, PdfColor textColor) {
+    return pw.Container(
+      padding: pw.EdgeInsets.all(10),
+      decoration: pw.BoxDecoration(
+        color: primaryColor.lighter(30),
+        borderRadius: pw.BorderRadius.circular(8),
+      ),
+      child: pw.Column(
+        crossAxisAlignment: pw.CrossAxisAlignment.start,
+        children: [
+          pw.Text(
+            'Cycle Report for ${user.name}',
+            style: pw.TextStyle(
+              fontSize: 24,
+              fontWeight: pw.FontWeight.bold,
+              color: primaryColor.isLight ? primaryColor.darker(50) : PdfColors.white,
+            ),
+          ),
+          pw.SizedBox(height: 5),
+          pw.Text(
+            'Generated on: ${DateFormat('MMMM d, yyyy').format(DateTime.now())}',
+            style: pw.TextStyle(fontSize: 12, color: primaryColor.isLight ? primaryColor.darker(30) : PdfColors.white.darker(10)),
+          ),
+        ],
+      ),
+    );
+  }
+
+  static pw.Widget _buildCycleSummary(UserProfile user, PdfColor textColor) {
+    return pw.Column(
+      crossAxisAlignment: pw.CrossAxisAlignment.start,
+      children: [
+        pw.Text(
+          'Summary',
+          style: pw.TextStyle(fontSize: 18, fontWeight: pw.FontWeight.bold, color: textColor),
+        ),
+        pw.SizedBox(height: 10),
+        pw.Text('Average Cycle Length: ${user.averageCycleLength} days', style: pw.TextStyle(color: textColor)),
+        pw.Text('Average Period Length: ${user.averagePeriodLength} days', style: pw.TextStyle(color: textColor)),
+        if (user.lastPeriodStartDate != null)
+          pw.Text('Last Period Start: ${DateFormat.yMMMMd().format(user.lastPeriodStartDate!)}', style: pw.TextStyle(color: textColor)),
+        pw.Text('Irregular Cycle: ${user.isIrregularCycle ? 'Yes' : 'No'}', style: pw.TextStyle(color: textColor)),
+      ],
+    );
+  }
+
+  static pw.Widget _buildEntriesTable(List<CycleEntry> entries, PdfColor primaryColor, PdfColor textColor) {
+    final headers = ['Date', 'Period', 'Mood', 'Symptoms', 'Notes'];
+
+    return pw.Table.fromTextArray(
+      headers: headers,
+      data: entries.map((entry) {
+        return [
+          DateFormat.yMMMd().format(entry.date),
+          entry.isPeriodDay ? 'Yes' : 'No',
+          entry.mood != null ? entry.mood!.label : 'N/A',
+          entry.hasSymptoms ? entry.symptomCount.toString() : 'No',
+          entry.notes != null && entry.notes!.isNotEmpty ? entry.notes! : 'N/A',
+        ];
+      }).toList(),
+      border: pw.TableBorder.all(color: primaryColor.lighter(10)),
+      headerStyle: pw.TextStyle(fontWeight: pw.FontWeight.bold, color: primaryColor),
+      cellStyle: pw.TextStyle(color: textColor),
+      cellAlignment: pw.Alignment.centerLeft,
+      headerDecoration: pw.BoxDecoration(color: primaryColor.lighter(20)),
+      rowDecoration: pw.BoxDecoration(color: PdfColors.grey100),
+      tableWidth: pw.TableWidth.min,
+    );
+  }
+}
+
+// Extension to determine if a color is light or dark for text contrast
+extension on PdfColor {
+  bool get isLight {
+    // Calculate luminance (Y from YIQ)
+    // Formula: Y = (R*299 + G*587 + B*114) / 1000
+    final r = red * 255;
+    final g = green * 255;
+    final b = blue * 255;
+    final luminance = (r * 299 + g * 587 + b * 114) / 1000;
+    return luminance > 128; // Using 128 as a threshold
+  }
+  
+  PdfColor lighter(int amount) {
+    double factor = 1 + (amount / 100.0);
+    return PdfColor(
+      red * factor > 1.0 ? 1.0 : red * factor,
+      green * factor > 1.0 ? 1.0 : green * factor,
+      blue * factor > 1.0 ? 1.0 : blue * factor,
+    );
+  }
+
+  PdfColor darker(int amount) {
+    double factor = 1 - (amount / 100.0);
+    return PdfColor(
+      red * factor < 0.0 ? 0.0 : red * factor,
+      green * factor < 0.0 ? 0.0 : green * factor,
+      blue * factor < 0.0 ? 0.0 : blue * factor,
+    );
+  }
+}