1 files changed, 66 insertions, 1 deletions
diff --git a/geldschieberbot.py b/geldschieberbot.py
index 2c13ca8..27596cd 100644
--- a/geldschieberbot.py
+++ b/geldschieberbot.py
@@ -165,6 +165,7 @@ cars [cmd] - interact with the available cars
 cars [list | ls] - list available cars and their service charge
 cars add car-name service-charge - add new car
 cars new car-name service-charge - add new car
+cars pay car-name amount - pay a bill for the specified car
 
 tanken amount [person] [car] [info] - calculate fuel costs, service charge and add them to the person's and car's balance respectively
 
@@ -416,8 +417,72 @@ def cars(sender, args, msg):
         available_cars[car] = service_charge
         add_to_balance(car)
         return 'added "{}" as an available car'.format(car), None
+    # pay bill
+    elif args[1] in ["pay"]:
+        if len(args) < 4:
+            return None, 'not in form "{} {} car-name amount"'.format(args[0], args[1])
+
+        if not sender in num2name:
+            return None, "you must register first"
+        else:
+            sender_name = num2name[sender]
+
+        car = args[2]
+        if car not in available_cars:
+            return None, 'car "{}" not known'.format(car)
+
+        try:
+            amount = to_cent(args[3])
+            amount_euro = to_euro(amount)
+        except:
+            return None, "amount must be a positive number"
+
+        output = ""
+
+        global record_changes
+        saved_record_changes = record_changes
+        record_changes = False
+        change = [args]
+
+        total_available_charge = 0
+        available_charges = []
+        for person in balance[car]:
+            _amount = balance[car][person]
+            if _amount < 0:
+                total_available_charge -= _amount
+                available_charges.append((person, _amount))
+
+        proportion = -1
+        if amount < total_available_charge:
+            proportion = -1 * (amount / total_available_charge)
+
+        _, err = transaction(sender, f"!gib {car} {amount_euro}".split(), "")
+        assert(err is None)
+        output += f"{sender_name} payed {amount_euro}\n"
+
+        # transfere money
+        for person, _amount in available_charges:
+            if person == sender_name or _amount >= 0:
+                continue
+
+            to_move = _amount * proportion
+            to_move_euro = to_euro(to_move)
+            ret, err = transfer(sender, ["transfer", to_move_euro, car, person], "")
+            assert(err is None)
+
+            output += "Transfere {} from {} to {}\n".format(to_move_euro, person, sender_name)
+
+        output += "New Balances:\n"
+        output += create_summary(sender_name) + "\n"
+        output += create_summary(car)
+
+        if record_changes and not dry_run:
+            changes[sender].append(change)
+        record_changes = saved_record_changes
+
+        return output, None
     else:
-        return None, 'cmd not in form "{} [cmd]"'.format(args[0])
+        return None, 'unknown car subcommand "{}".'.format(args[1])
 
 cmds["cars"] = cars