322 lines
12 KiB
Python
322 lines
12 KiB
Python
import json
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from decimal import *
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from datetime import *
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from jinja2 import Environment, FileSystemLoader
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from fpdf import FPDF, HTMLMixin
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import smtplib
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from email.MIMEMultipart import MIMEMultipart
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from email.MIMEText import MIMEText
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from email.MIMEBase import MIMEBase
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from email import Encoders
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def getStatementHeader(datastore):
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return datastore['header']
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def getEmailInformation(datastore):
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return datastore['email']
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def loadLoanInformation(filename):
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datastore = getDatastore(filename)
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loanModel = {}
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loanModel['datastore'] = datastore
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loanModel['email'] = getEmailInformation(datastore)
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loanModel['parameters'] = getLoanParameters(datastore)
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loanModel['lender'] = getLender(datastore)
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loanModel['borrower'] = getBorrower(datastore)
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loanModel['header'] = getStatementHeader(datastore)
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return loanModel
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def getLoanParameters(datastore):
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# read in the loan profile information
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loan = datastore['parameters']
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annual_rate = Decimal(loan['interest_rate']) / 100
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daily_interest_rate = annual_rate / 360
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principal = Decimal(loan["principal"]).quantize(Decimal("1.00"))
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periods_per_year = Decimal(loan["periods_per_year"])
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total_periods = Decimal(loan["periods"])
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payment_day_of_month = int(loan['payment_day_of_month'])
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if "monthly_payment" in loan:
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monthly_payment = Decimal(loan["monthly_payment"]).quantize(Decimal("1.00"))
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else:
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# calculate expected monthly payment
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periodic_rate = annual_rate / periods_per_year
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discount_factor = (((1 + periodic_rate) ** total_periods) - 1) / (
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periodic_rate * ((1 + periodic_rate) ** total_periods))
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monthly_payment = (principal / discount_factor).quantize(Decimal("1.00"))
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loan['principal'] = principal # standardizes the format
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loan['annual_rate'] = annual_rate # standardizes the format
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loan['daily_interest_rate'] = daily_interest_rate
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loan['rate'] = '' + (annual_rate * 100).__str__() + '%'
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loan['next_payment_amt'] = 0
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loan['next_payment_date'] = '12/12/12'
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loan['total_periods'] = total_periods
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loan['monthly_payment'] = monthly_payment
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datastore['parameters'] = loan
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return loan
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def getLender(datastore):
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return datastore['lender']
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def getBorrower(datastore):
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return datastore['borrower']
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def getDatastore(filename=None):
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try:
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if filename:
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with open(filename, 'r') as f:
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datastore = json.load(f)
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except Exception as e:
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print "An error occurred opening your loan file '%s'. " % filename
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print "The Exception:"
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print e.__repr__()
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quit()
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return datastore
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def amortizeLoan(loan):
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# loop over the payments and calculate the actual amortization
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monthly_payment = loan["parameters"]["monthly_payment"]
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actual_payments = loan["datastore"]["payments"]
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remaining_principal = loan["parameters"]["principal"]
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payment_day_of_month = int(loan["parameters"]["payment_day_of_month"])
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daily_interest_rate = loan["parameters"]["daily_interest_rate"]
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total_periods = loan["parameters"]["total_periods"]
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interest_paid_through_date = datetime.strptime(loan["parameters"]["start_interest_date"], "%Y-%m-%d").date()
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next_payment_date = datetime.strptime(loan["parameters"]["first_payment_month"], '%Y-%m-%d').date()
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next_bill_date = date(year=next_payment_date.year, month=next_payment_date.month, day=payment_day_of_month)
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payment_number = 1
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annual_interest = 0
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total_interest = 0
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old_bill_date = next_bill_date
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current_year = next_bill_date.year
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past_payments = []
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future_payments = []
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for payment in actual_payments:
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payment_date = datetime.strptime((payment[0]), '%Y-%m-%d').date()
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payment_amount = Decimal(payment[1]).quantize(Decimal("1.00"))
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days_since_last_payment = (payment_date - interest_paid_through_date).days
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#check for out of order payments, generally a sign of a data entry problem, especially years
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if days_since_last_payment < 0:
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print "Payment Number %s appears out of order. The payment date '%s' is before the previous payment on '%s'." \
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% (payment_number, payment_date, interest_paid_through_date)
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quit()
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new_interest = (days_since_last_payment * remaining_principal * daily_interest_rate).quantize(Decimal("0.00"))
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new_principal = payment_amount - new_interest
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interest_paid_through_date = payment_date
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total_interest = total_interest + new_interest
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annual_interest = annual_interest + new_interest
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remaining_principal = remaining_principal - new_principal
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# create the payment record for the template to render
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payment_record = {}
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payment_record['year']=next_bill_date.year
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payment_record['month']=next_bill_date.month
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payment_record['payment_number'] = payment_number
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payment_record['bill_date'] = next_bill_date
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payment_record['payment_date'] = payment_date
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payment_record['days_of_interest'] = days_since_last_payment
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payment_record['payment_amount'] = payment_amount
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payment_record['principal_payment'] = payment_amount - new_interest
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payment_record['interest_payment'] = new_interest
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payment_record['new_balance'] = remaining_principal
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payment_record['interest_to_date'] = total_interest
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payment_record['annual_interest_to_date'] = annual_interest
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past_payments.append(payment_record)
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payment_number = payment_number + 1
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old_bill_date = next_bill_date
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if old_bill_date.month < 12:
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next_bill_date = date(year=old_bill_date.year, month=old_bill_date.month + 1, day=payment_day_of_month)
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else:
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annual_interest = Decimal("0.00")
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next_bill_date = date(year=old_bill_date.year + 1, month=1, day = payment_day_of_month)
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loan["total_interest_paid_to_date"] = total_interest
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loan["parameters"]["next_due_date"] = next_bill_date
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if (remaining_principal < monthly_payment):
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loan["parameters"]["next_payment_amt"] = remaining_principal
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else:
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loan["parameters"]["next_payment_amt"] = monthly_payment
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# loop over remaining scheduled payments and present estimated amortization
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while (payment_number <= total_periods) and (remaining_principal > 0):
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days_since_last_payment = (next_bill_date - interest_paid_through_date).days
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new_interest = (days_since_last_payment * remaining_principal * daily_interest_rate).quantize(Decimal("0.00"))
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# make sure the last payment isn't too much
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if new_interest + remaining_principal < monthly_payment:
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monthly_payment = new_interest + remaining_principal
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new_principal = monthly_payment - new_interest
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remaining_principal = remaining_principal - new_principal
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interest_paid_through_date = next_bill_date
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# complete the future payment amortization record
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future_payment_record = {}
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future_payment_record['payment_number'] = payment_number
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future_payment_record['payment_date'] = next_bill_date
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future_payment_record['days_of_interest'] = days_since_last_payment
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future_payment_record['payment_amount'] = monthly_payment
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future_payment_record['principal_payment'] = new_principal
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future_payment_record['interest_payment'] = new_interest
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future_payment_record['new_balance'] = remaining_principal
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future_payments.append(future_payment_record)
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payment_number = payment_number + 1
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old_bill_date = next_bill_date
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if old_bill_date.month < 12:
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next_bill_date = date(year=old_bill_date.year, month=old_bill_date.month + 1, day=payment_day_of_month)
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else:
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next_bill_date = date(year=old_bill_date.year + 1, month=1, day=payment_day_of_month)
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loan["balloon_payment"] = remaining_principal
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loan["past_payments"] = past_payments
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loan["future_payments"] = future_payments
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return
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def transformTemplate(template_fileName, loanModel):
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# template_filename = "statement.txt.jinja"
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# setup jinja for creating the statement
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env = Environment(loader=FileSystemLoader('.'))
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template = env.get_template(template_fileName)
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print loanModel
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report = template.render(model=loanModel)
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return report
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def generatePDFAttachment():
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template_filename = "statement.pdf.jinja"
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pass
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def generateEmail(from_address, to_address, subject, body, pdfAttachment, txtAttachment):
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msg = MIMEMultipart()
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msg['Subject'] = subject
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msg['From'] = from_address
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msg['To'] = to_address
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msg.attach(MIMEText(body))
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if (pdfAttachment != None):
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part = MIMEBase("application", "octet-stream")
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part.set_payload(pdfAttachment)
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Encoders.encode_base64(part)
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part.add_header('Content-Disposition', 'attachment; filename="statement.pdf"')
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msg.attach(part)
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if (txtAttachment != None):
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part = MIMEBase("text", "html")
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part.set_payload(txtAttachment)
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Encoders.encode_base64(part)
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part.add_header('Content-Disposition', 'attachment; filename="statement.html"')
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msg.attach(part)
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return msg
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def sendEmail(msg, from_address, to_address, passwd):
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try:
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server = smtplib.SMTP('smtp.gmail.com', 587)
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server.ehlo()
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server.starttls()
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server.login(from_address, passwd)
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server.sendmail(from_address, to_address, msg.as_string())
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server.close()
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except:
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print "Couldn't send email."
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def createPDF(report):
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# create pdf
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class MyFPDF(FPDF, HTMLMixin):
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pass
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pdf = MyFPDF()
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pdf.set_font(family='Arial', size=12)
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pdf.add_page()
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pdf.write_html(report)
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# pdf.output(name='test.pdf', dest='F')
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return pdf.output(dest='S')
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def selectTemplate(loan):
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templateKey = loan["datastore"]["format"] + "Template"
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if templateKey in loan:
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template = loan[templateKey]
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else:
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template = 'statement.pdf.jinja'
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return template
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def main():
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test_flag = True
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# this program reads the json file describing a mortgage and calculate the actual and projected amortization
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# the first payment in the file should be the interest paid at closing
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# the interest at closing covers interest that would be incurred from the date of closing until the first day
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# that will be covered by the first loan payment
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# i.e., the first loan payment is expected a month and a half after closing, the first two weeks interest is due
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# at closing. The first payment will incur interest from one month before the bill is due.
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# read in the file
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test_flag = False
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test_address = 'jkent3rd@yahoo.com'
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#filename = "./testloan.json"
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filename = "./9Kloan.json"
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#filename = "./dadmortgage.json"
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#filename = "./brendamortgage.json"
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#filename = "./greenfield_mortgage.json"
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template_filename = "statement.pdf.jinja"
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loan = loadLoanInformation(filename)
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amortizeLoan(loan)
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report = transformTemplate(selectTemplate(loan), loan)
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if loan["email"]["send_pdf"] == "true":
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pdfAttachment = createPDF(report)
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# send email
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emailParameters = loan["email"]
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msg = generateEmail(emailParameters["from_address"], emailParameters["to_address"], emailParameters["subject"],
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emailParameters["body"], pdfAttachment, report)
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if test_flag == False:
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sendEmail(msg, emailParameters["from_address"], emailParameters["to_address"], emailParameters['password'])
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else:
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sendEmail(msg, emailParameters["from_address"], test_address, emailParameters['password'])
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if __name__ == '__main__':
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main()
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