The tool can now update payment history.

web.py

@@ -1,4 +1,4 @@
-from flask import Flask, render_template, request, redirect, url_for
+from flask import Flask, render_template, request, redirect
 import json
 from decimal import *
 from datetime import *
@@ -32,15 +32,72 @@ def hello():
     else:
         return redirect('/?loan=' + loans[0]['filename'])
 
-    loan = loadLoanInformation('/Users/john/PycharmProjects/mortgage/' + filename)
+    loan = loadLoanInformation(getFullPathofLoanFile(filename))
     amortizeLoan(loan)
 
     return render_template('main.html', filename=filename, loans=loans, model=loan)
 
-@app.route('/update_file')
+@app.route('/update_file', methods=['POST'])
 def update_file():
-    loanFile = request.form['loan']
-    return redirect( '/?loan=' + loan )
+
+    messages = []
+
+    loanFile = request.form["loan"]
+    data = getDatastore(getFullPathofLoanFile(loanFile))
+
+    payment_history = data["payments"]
+
+    if 'date' in request.form:
+            if (request.form['date'] == ''):
+                now = datetime.now()
+                payment_date = str(now.strftime("%Y-%m-%d"))
+                messages.append("No date was provided.  Assuming today's date of " + payment_date + ".")
+            else:
+                payment_date = request.form['date']
+                messages.append("Date provided: " + payment_date + ".")
+    else:
+        now = datetime.now()
+        payment_date = str(now.strftime("%Y-%m-%d"))
+
+    payment_amount = Decimal('0.00')
+    proceed_flag = True
+    if 'amount' in request.form:
+        if (request.form['amount'] != ''):
+            try:
+                payment_amount = Decimal(request.form['amount'])
+                messages.append("Amount provided: " + str(payment_amount) + ".")
+            except:
+                payment_amount = Decimal('0.00')
+                messages.append("The amount provided could not be interpreted.  Your payment was not recorded.")
+                proceed_flag = False
+            else:
+                pass
+
+    if proceed_flag is True:
+        try:
+            backup_filename = loanFile + ".backup-" + datetime.now().strftime("%Y-%m-%d %H-%M-%S")
+            backup_file = open(getFullPathofLoanFile(backup_filename), 'w+')
+            json.dump(data, backup_file)
+            backup_file.close()
+        except:
+            messages.append("A backup file could not be created.  Your payment was not recorded.")
+            proceed_flag = False
+        else:
+            messages.append("A backup of your file was created: '" + backup_filename +"'" )
+
+    if proceed_flag is True:
+        try:
+            payment_history.append( [payment_date, str(payment_amount)])
+            file = open(getFullPathofLoanFile(loanFile), 'w+')
+            json.dump(data, file)
+            file.close()
+        except:
+            messages.append("An error occurred writing to the file.  Your payment file may be corrupt, " + \
+                            "please consider rolling back to the backup created above.")
+        else:
+            messages.append("The payment was successfully written. ")
+
+    return render_template('add.html', filename=loanFile, messages=messages)
 
 @app.route('/send_statement', methods=['POST'])
 def send_statement():
@@ -49,7 +106,7 @@ def send_statement():
     message = request.form["message"]
     style = request.form["style"]
 
-    loan = loadLoanInformation('/Users/john/PycharmProjects/mortgage/' + loanFile)
+    loan = loadLoanInformation(getFullPathofLoanFile(loanFile))
     amortizeLoan(loan)
 
     reportCreated = False
@@ -89,6 +146,9 @@ def addLoan(loanName, fileName):
     x['filename'] = fileName
     return x
 
+def getFullPathofLoanFile(filename):
+    return '/Users/john/PycharmProjects/mortgage/' + filename
+
 ###################
 # from old code   #
 ###################