first commit

app/services/export.py

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+from __future__ import annotations
+
+import csv
+from io import BytesIO, StringIO
+
+from reportlab.lib.pagesizes import A4
+from reportlab.pdfgen import canvas
+
+
+def export_expenses_csv(expenses):
+    output = StringIO()
+    writer = csv.writer(output)
+    writer.writerow(['Date', 'Title', 'Vendor', 'Category', 'Amount', 'Currency', 'Payment method', 'Tags'])
+    for expense in expenses:
+        writer.writerow([
+            expense.purchase_date.isoformat(),
+            expense.title,
+            expense.vendor,
+            expense.category.name_en if expense.category else '',
+            str(expense.amount),
+            expense.currency,
+            expense.payment_method,
+            expense.tags,
+        ])
+    return output.getvalue()
+
+
+def export_expenses_pdf(expenses, title: str = 'Expenses'):
+    buffer = BytesIO()
+    pdf = canvas.Canvas(buffer, pagesize=A4)
+    width, height = A4
+    y = height - 40
+    pdf.setFont('Helvetica-Bold', 14)
+    pdf.drawString(40, y, title)
+    y -= 30
+    pdf.setFont('Helvetica', 10)
+    for expense in expenses:
+        line = f'{expense.purchase_date.isoformat()} | {expense.title} | {expense.amount} {expense.currency}'
+        pdf.drawString(40, y, line[:100])
+        y -= 16
+        if y < 60:
+            pdf.showPage()
+            y = height - 40
+            pdf.setFont('Helvetica', 10)
+    pdf.save()
+    buffer.seek(0)
+    return buffer.read()