05/31 Phase 6
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"""
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Export Service — CSV, Excel, and PDF generation for transactions and reports.
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"""
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import io
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import csv
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from datetime import date
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from flask import current_app
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from app.models.transaction import Transaction
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# ── CSV export ────────────────────────────────────────────────────────────────
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def transactions_to_csv(transactions):
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"""Return a CSV string of transactions."""
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output = io.StringIO()
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writer = csv.writer(output)
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writer.writerow(['Date', 'Type', 'Description', 'Category', 'Account', 'Amount', 'Notes'])
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for txn in transactions:
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writer.writerow([
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txn.date.strftime('%Y-%m-%d'),
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txn.transaction_type,
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txn.description,
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txn.category.name if txn.category else '',
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txn.account.name if txn.account else '',
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float(txn.amount),
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txn.notes or '',
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])
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output.seek(0)
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return output.getvalue()
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# ── Excel export ──────────────────────────────────────────────────────────────
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def transactions_to_excel(transactions, period_label='Transactions'):
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"""Return Excel bytes for a list of transactions."""
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from openpyxl import Workbook
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from openpyxl.styles import Font, PatternFill, Alignment, Border, Side
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from openpyxl.utils import get_column_letter
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wb = Workbook()
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ws = wb.active
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ws.title = period_label[:31] # max 31 chars
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symbol = current_app.config.get('APP_CURRENCY_SYMBOL', '$')
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# Header style
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header_fill = PatternFill(start_color='0F172A', end_color='0F172A', fill_type='solid')
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header_font = Font(color='F1F5F9', bold=True, size=10)
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thin = Side(style='thin', color='E2E8F0')
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border = Border(bottom=Side(style='thin', color='E2E8F0'))
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headers = ['Date', 'Type', 'Description', 'Category', 'Account', f'Amount ({symbol})', 'Notes']
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col_widths = [12, 10, 40, 18, 18, 16, 30]
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for col, (header, width) in enumerate(zip(headers, col_widths), 1):
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cell = ws.cell(row=1, column=col, value=header)
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cell.font = header_font
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cell.fill = header_fill
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cell.alignment = Alignment(horizontal='left', vertical='center')
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ws.column_dimensions[get_column_letter(col)].width = width
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ws.row_dimensions[1].height = 22
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# Data rows
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income_fill = PatternFill(start_color='F0FDF4', end_color='F0FDF4', fill_type='solid')
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expense_fill = PatternFill(start_color='FFF7F7', end_color='FFF7F7', fill_type='solid')
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for row_num, txn in enumerate(transactions, 2):
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fill = income_fill if txn.transaction_type == 'income' else expense_fill
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data = [
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txn.date.strftime('%Y-%m-%d'),
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txn.transaction_type.title(),
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txn.description,
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txn.category.name if txn.category else '',
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txn.account.name if txn.account else '',
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float(txn.amount),
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txn.notes or '',
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]
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for col, value in enumerate(data, 1):
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cell = ws.cell(row=row_num, column=col, value=value)
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cell.fill = fill
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cell.border = border
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cell.font = Font(size=10)
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if col == 6:
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cell.number_format = f'#,##0.00'
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cell.alignment = Alignment(horizontal='right')
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# Totals row
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total_row = len(transactions) + 2
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ws.cell(row=total_row, column=5, value='TOTAL').font = Font(bold=True, size=10)
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total_cell = ws.cell(row=total_row, column=6,
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value=sum(float(t.amount) for t in transactions))
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total_cell.font = Font(bold=True, size=10)
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total_cell.number_format = f'#,##0.00'
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total_cell.alignment = Alignment(horizontal='right')
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output = io.BytesIO()
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wb.save(output)
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output.seek(0)
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return output.getvalue()
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# ── PDF export ────────────────────────────────────────────────────────────────
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def report_to_pdf(html_content):
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"""Convert HTML string to PDF bytes using WeasyPrint."""
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try:
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from weasyprint import HTML, CSS
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pdf = HTML(string=html_content).write_pdf()
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return pdf
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except Exception as e:
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import logging
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logging.getLogger(__name__).error(f'[export] PDF generation failed: {e}')
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return None
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def build_report_html(report_data, report_type, currency_symbol='$'):
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"""Build a clean HTML string for PDF export."""
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today = date.today().strftime('%B %d, %Y')
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period = report_data.get('period', '')
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income = report_data.get('income', 0)
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expense = report_data.get('expense', 0)
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net = report_data.get('net', 0)
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savings_rate = report_data.get('savings_rate', 0)
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def fmt(v):
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return f"{currency_symbol}{abs(float(v)):,.2f}"
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# Expense categories table rows
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cat_rows = ''
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total_exp = sum(c['total'] for c in report_data.get('expense_categories', []))
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for cat in report_data.get('expense_categories', []):
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pct = round(cat['total'] / total_exp * 100, 1) if total_exp > 0 else 0
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cat_rows += f'''
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<tr>
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<td>{cat['name']}</td>
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<td style="text-align:right">{fmt(cat['total'])}</td>
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<td style="text-align:right">{pct}%</td>
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</tr>'''
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html = f'''<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<style>
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body {{ font-family: Arial, sans-serif; font-size: 12px; color: #1e293b; margin: 40px; }}
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h1 {{ font-size: 22px; color: #0f172a; border-bottom: 2px solid #3b82f6; padding-bottom: 8px; }}
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h2 {{ font-size: 14px; color: #475569; margin-top: 24px; }}
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.summary {{ display: flex; gap: 20px; margin: 16px 0; }}
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.stat {{ background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; padding: 12px 16px; flex: 1; }}
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.stat-label {{ font-size: 10px; text-transform: uppercase; letter-spacing: .06em; color: #94a3b8; }}
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.stat-value {{ font-size: 18px; font-weight: bold; margin-top: 4px; }}
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.income {{ color: #10b981; }}
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.expense {{ color: #ef4444; }}
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.net-pos {{ color: #3b82f6; }}
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.net-neg {{ color: #ef4444; }}
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table {{ width: 100%; border-collapse: collapse; margin-top: 8px; }}
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th {{ background: #0f172a; color: #f1f5f9; padding: 8px 10px; font-size: 10px; text-align: left; }}
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td {{ padding: 7px 10px; border-bottom: 1px solid #f1f5f9; }}
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tr:nth-child(even) {{ background: #f8fafc; }}
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.footer {{ margin-top: 30px; font-size: 10px; color: #94a3b8; text-align: center; }}
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</style>
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</head>
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<body>
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<h1>Personal Finance Report — {period}</h1>
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<p style="color:#94a3b8;font-size:11px;">Generated {today}</p>
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<div class="summary">
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<div class="stat">
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<div class="stat-label">Income</div>
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<div class="stat-value income">{fmt(income)}</div>
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</div>
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<div class="stat">
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<div class="stat-label">Expenses</div>
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<div class="stat-value expense">{fmt(expense)}</div>
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</div>
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<div class="stat">
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<div class="stat-label">Net</div>
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<div class="stat-value {'net-pos' if net >= 0 else 'net-neg'}">{fmt(net)}</div>
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</div>
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<div class="stat">
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<div class="stat-label">Savings Rate</div>
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<div class="stat-value {'net-pos' if net >= 0 else 'net-neg'}">{savings_rate}%</div>
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</div>
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</div>
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<h2>Expense Breakdown</h2>
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<table>
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<thead><tr><th>Category</th><th style="text-align:right">Amount</th><th style="text-align:right">% of Total</th></tr></thead>
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<tbody>{cat_rows or '<tr><td colspan="3" style="color:#94a3b8;">No expenses</td></tr>'}</tbody>
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</table>
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<div class="footer">PFM Personal Finance · pfm.ngodanguyen.tech</div>
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</body>
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</html>'''
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return html
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