From 024e01883988419d7842e1dbd5cf4ec2baaab19d Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Tue, 17 Jul 2018 19:32:00 +0300
Subject: Fix: how the various numbers are caluclated

---
 lasku.py | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/lasku.py b/lasku.py
index 8f9e185..dc56a25 100755
--- a/lasku.py
+++ b/lasku.py
@@ -6,6 +6,9 @@ import sys
 import yaml
 
 
+def debug(*args):
+    sys.stderr.write('{}\n'.format(' '.join(str(x) for x in args)))
+
 def euros(cents):
     return '%.02f' % (cents / 100.0)
 
@@ -13,18 +16,35 @@ def euros(cents):
 class Item:
 
     def __init__(self, itemdict):
-        self.dict = itemdict
+        self.dict = dict(itemdict)
 
         count = itemdict['count']
-        unit_cents = int(itemdict['unit'] * 100)
+        if count == "":
+            return
+
+        unit_cents = int(itemdict['unit'] * 100.0)
         vatpc = float(itemdict['vatpc']) / 100.0
 
         self.total_cents = count * unit_cents
-        self.vat_cents = int(unit_cents * vatpc)
+
+        self.vat_cents = 0
+        if vatpc > 0:
+            total_cents_with_vat = int(unit_cents / (1.0 - vatpc))
+            self.vat_cents = total_cents_with_vat - unit_cents
+            debug('dict', self.dict)
+            debug('total_cents', self.total_cents)
+            debug('vatpc', vatpc)
+            debug('total_cents_with_vat', total_cents_with_vat)
+            debug('vat_cents', self.vat_cents)
+            debug('calc', int(vatpc * total_cents_with_vat))
+            assert int(total_cents_with_vat * vatpc) == self.vat_cents
+            assert total_cents_with_vat == unit_cents + self.vat_cents
 
         self.dict.update({
+            'unit_euros': euros(unit_cents),
             'total_cents': self.total_cents,
             'total': euros(self.total_cents),
+            'unitwithvat': euros(self.total_cents + self.vat_cents),
             'vat_cents': self.vat_cents,
             'vat': euros(self.vat_cents),
             'vatsum': euros(self.vat_cents * count),
@@ -36,8 +56,8 @@ item_template = (
     r'\raggedbottom #number# & '
     r'\parbox[t]{5.5cm}{#desc#\\#date#} & '
     r'\raggedbottom #count# & '
-    r'\raggedbottom #unit# & '
-    r'\raggedbottom #vat# & '
+    r'\raggedbottom #unit_euros# & '
+    r'\raggedbottom #unitwithvat# & '
     r'\raggedbottom #vatpc#\% & '
     r'\raggedbottom #total# & '
     r'\raggedbottom #vatsum# & '
-- 
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