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gsinghpal
180
Fusion Accounting/wizard/loan_import_wizard.py
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180
Fusion Accounting/wizard/loan_import_wizard.py
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"""
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Fusion Accounting - Loan CSV Import Wizard
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Allows bulk-importing loan records from a CSV file with the columns:
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name, principal, rate, term, start_date.
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After import, each loan is created in Draft state so the user can
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review parameters and compute the amortization schedule manually.
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"""
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import base64
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import csv
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import io
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from datetime import datetime
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from odoo import api, fields, models, _
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from odoo.exceptions import UserError, ValidationError
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class FusionLoanImportWizard(models.TransientModel):
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"""Transient wizard to import loans from a CSV file.
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Expected CSV columns (header required):
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- name : Loan reference / description
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- principal : Principal amount (float)
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- rate : Annual interest rate in percent (float)
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- term : Loan term in months (integer)
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- start_date : Start date in YYYY-MM-DD format
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"""
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_name = 'fusion.loan.import.wizard'
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_description = 'Import Loans from CSV'
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csv_file = fields.Binary(
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string='CSV File',
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required=True,
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help="Upload a CSV file with columns: name, principal, rate, term, start_date.",
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)
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csv_filename = fields.Char(string='Filename')
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journal_id = fields.Many2one(
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'account.journal',
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string='Default Journal',
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required=True,
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domain="[('type', 'in', ['bank', 'general'])]",
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help="Journal to assign to all imported loans.",
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)
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loan_account_id = fields.Many2one(
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'account.account',
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string='Default Loan Account',
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required=True,
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help="Liability account for imported loans.",
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)
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interest_account_id = fields.Many2one(
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'account.account',
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string='Default Interest Account',
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required=True,
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help="Expense account for interest on imported loans.",
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)
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partner_id = fields.Many2one(
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'res.partner',
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string='Default Lender',
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required=True,
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help="Default lender assigned when the CSV doesn't specify one.",
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)
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payment_frequency = fields.Selection(
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selection=[
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('monthly', 'Monthly'),
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('quarterly', 'Quarterly'),
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('semi_annually', 'Semi-Annually'),
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('annually', 'Annually'),
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],
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string='Default Payment Frequency',
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default='monthly',
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required=True,
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)
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amortization_method = fields.Selection(
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selection=[
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('french', 'French (Equal Payments)'),
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('linear', 'Linear (Equal Principal)'),
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],
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string='Default Amortization Method',
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default='french',
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required=True,
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)
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auto_compute = fields.Boolean(
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string='Auto-Compute Schedules',
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default=False,
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help="Automatically compute the amortization schedule after import.",
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)
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# Required CSV header columns
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_REQUIRED_COLUMNS = {'name', 'principal', 'rate', 'term', 'start_date'}
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def action_import(self):
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"""Parse the uploaded CSV and create loan records."""
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self.ensure_one()
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if not self.csv_file:
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raise UserError(_("Please upload a CSV file."))
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# Decode file
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try:
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raw = base64.b64decode(self.csv_file)
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text = raw.decode('utf-8-sig') # handles BOM gracefully
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except Exception as exc:
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raise UserError(
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_("Unable to read the file. Ensure it is a valid UTF-8 CSV. (%s)", exc)
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)
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reader = csv.DictReader(io.StringIO(text))
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# Validate headers
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if not reader.fieldnames:
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raise UserError(_("The CSV file appears to be empty."))
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headers = {h.strip().lower() for h in reader.fieldnames}
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missing = self._REQUIRED_COLUMNS - headers
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if missing:
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raise UserError(
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_("Missing required CSV columns: %s", ', '.join(sorted(missing)))
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)
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# Build column name mapping (stripped & lowered -> original)
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col_map = {h.strip().lower(): h for h in reader.fieldnames}
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loan_vals_list = []
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errors = []
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for row_num, row in enumerate(reader, start=2):
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try:
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name = (row.get(col_map['name']) or '').strip()
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principal = float(row.get(col_map['principal'], 0))
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rate = float(row.get(col_map['rate'], 0))
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term = int(row.get(col_map['term'], 0))
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start_raw = (row.get(col_map['start_date']) or '').strip()
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start_date = datetime.strptime(start_raw, '%Y-%m-%d').date()
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except (ValueError, TypeError) as exc:
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errors.append(_("Row %s: %s", row_num, exc))
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continue
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if principal <= 0:
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errors.append(_("Row %s: principal must be positive.", row_num))
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continue
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if term <= 0:
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errors.append(_("Row %s: term must be positive.", row_num))
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continue
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loan_vals_list.append({
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'name': name or _('New'),
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'partner_id': self.partner_id.id,
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'journal_id': self.journal_id.id,
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'loan_account_id': self.loan_account_id.id,
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'interest_account_id': self.interest_account_id.id,
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'principal_amount': principal,
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'interest_rate': rate,
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'loan_term': term,
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'start_date': start_date,
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'payment_frequency': self.payment_frequency,
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'amortization_method': self.amortization_method,
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})
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if errors:
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raise UserError(
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_("Import errors:\n%s", '\n'.join(str(e) for e in errors))
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)
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if not loan_vals_list:
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raise UserError(_("No valid loan rows found in the CSV file."))
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loans = self.env['fusion.loan'].create(loan_vals_list)
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if self.auto_compute:
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for loan in loans:
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loan.compute_amortization_schedule()
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# Return the newly created loans
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return {
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'name': _('Imported Loans'),
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'type': 'ir.actions.act_window',
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'res_model': 'fusion.loan',
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'view_mode': 'list,form',
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'domain': [('id', 'in', loans.ids)],
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'target': 'current',
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}
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