"""

Author  : flo
date    : 2017.02.19
Purpose : example of finding out the amount of principle paid to mortgage lender per year.
        : This version is special.

Comments: Simulate the number of mortgage payments based on the loan amount
        : one can alter the number of months in the outer loop to reflect the
        : term for your mortgage.
        : run the example command to first see how it needs to run.
        :
Issues  : getopt lib wont seem to take long version ,   hummm...... ideas ??
        : still cant quite grasp the getopt function, since i wanted to use both
        : "--help, --version, --loanamt, --loanterm, --loanrate, --loanint, --loanprin"

example : python mortgage-0.0.4.py -h
example : python mortgage-0.0.4.py -v

updated : fixed isdigit() and forgot an else statement
"""

import getopt
import sys


def computeMortgage(tot, mon, rate, intr, pal):

    for i in range(1, mon+1):
        # assuming 30 days per-month
        for x in range(1, 31):
            # .0450 is the assume interest amount
            tsum = tot * (rate/100.00) * (1.00/365.00)
            tot = tsum + tot
            print "Month\t" + str(i) + " Day\t" + str(x) + "\t" + str(round(tot, 2)) + "\t" + str(round(tsum, 2))
        tot = tot - (pal + intr)


def version():

    print "version 0.0.4"


def usage():

    usage = """

            usage: python mortgage.py [-l FLOAT_VALUE] [-t Integer_VALUE] [-r FLOAT_VALUE]
                                      [-i FLOAT_VALUE] [-p FLOAT_VALUE] [-h] [-v]

            usage: python mortgage.py

            usage: python mortgage.py -l 250000.99 -t 24 -r 4.95 -i 515.69 -p 600

            usage: python mortgage.py -v

            usage: python mortgage.py -h

            options :
            -l,          take a loan Value amount
            -t,          take an actual or a hypothetical value term
            -r,          take the monthly interests value rate
            -i,          take the monthly interests value amount
            -p,          take the monthly principle value amount
            -v,          show program's version number and exit
            -h,          show this help message and exit
            """

    print usage


def main():

    # default values
    lamt, lterm, lrate, lint, lprin = 200000.99, 10, 3.89, 450, 600.99

    # try the getopt function for kicks and giggles
    try:
        opts, args = getopt.getopt(sys.argv[1:], 'l:t:r:i:p:ver:hlp', ['loanamt', 'loanterm', 'loanrate', 'loanint', 'loanprin'])
    except getopt.GetoptError as err:
        # print something and exit
        print str(err)
        usage()
        sys.exit(2)

    # pull data from getopt
    for o, a in opts:
        if o in ('-l', '--loanamt'):
            if a.replace('.','',1).isdigit():
                lamt = float(a)
            else:
                print "Please enter your loan amount in digit form. "
                sys.exit(2)
        elif o in ('-t', '--loanterm'):
            if a.isdigit():
                lterm = int(a)
            else:
                print "Please enter your loan duration in digit form. "
                sys.exit(2)
        elif o in ('-r', '--loanrate'):
            if a.replace('.','',1).isdigit():
                lrate = float(a)
            else:
                print "Please enter your loan rate in digit form. "
                sys.exit(2)
        elif o in ('-i', '--loanint'):
            if a.replace('.','',1).isdigit():
                lint = float(a)
            else:
                print "Please enter your loan accrual monthly interests in digit form. "
                sys.exit(2)
        elif o in ('-p', '--loanprin'):
            if a.replace('.','',1).isdigit():
                lprin = float(a)
            else:
                print "Please enter your loan accrual monthly principle in digit form. "
                sys.exit(2)
        elif o in ('-v', '--version'):
            version()
            sys.exit()
        elif o in ('-h', '--help'):
            usage()
            sys.exit()
        else:
            assert False, "unhandled option"

    # compute and forecast it all
    computeMortgage(lamt, lterm, lrate, lint, lprin)

# calling main
if __name__ == "__main__":
    main()