From b33c73a15364ccf61de462a11a807b840bfd77f8 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fl.fischer@fau.de>
Date: Mon, 27 Nov 2017 17:30:41 +0100
Subject: add rewind command "fuck"

---
 geldschieberbot.py | 68 ++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 56 insertions(+), 12 deletions(-)

diff --git a/geldschieberbot.py b/geldschieberbot.py
index 2bfa1c8..2b2d564 100644
--- a/geldschieberbot.py
+++ b/geldschieberbot.py
@@ -13,10 +13,21 @@ balance = {}
 name2num = {}
 num2name = {}
 
+"""Dict associating users with their last change"""
+last_change = {}
+
 group_id = "GELD!!!"
 
 send_cmd = "signal-cli -u irgendwer send -g irgendwem"
 
+def record(sender, recipient, donor, amount):
+    """Apply change to the balance and save it"""
+
+    balance[donor][recipient] -= amount
+    balance[recipient][donor] += amount
+
+    last_change[sender] = [recipient, donor, amount]
+
 def to_cent(euro):
     euro = euro.split('.')
     if len(euro) > 2:
@@ -88,6 +99,8 @@ nimm amount donor - get money from donor
 
 tanken amount person [info] - calculate fuel costs and add them to the balance
 
+fuck - rewind last change
+
 Happy Geldschieben!
 """
 
@@ -147,6 +160,7 @@ def handle_input(inp):
         # "!schieb" "!gib" give money to somebody
         # "!zieh" "!nimm"  add debt of somebody
         # "!tanken"        calculate fuel cost parts
+        # "!fuck"          rewind last change
         if cmd == "!reg":
             if len(w) != 2:
                 send('ERROR: not in form "!reg name"')
@@ -204,7 +218,11 @@ def handle_input(inp):
             persons = len(w) - 2 + 1
             amount_per_person = int(amount/persons)
 
-            sender = num2name[sender_number]
+            if sender_number in num2name:
+                recipient = num2name[sender_number]
+            else:
+                send("ERROR: you must register first")
+                continue
 
             msg = "Split {} between {} -> {} each\n".format(to_euro(amount),
                                                             persons,
@@ -213,11 +231,10 @@ def handle_input(inp):
                 if not p in name2num:
                     msg += p + " not known. Please take care manually\n"
                 else:
-                    balance[sender][p] -= amount_per_person
-                    balance[p][sender] += amount_per_person
+                    record(sender_number, recipient, p, amount_per_person)
 
             msg += "New Balance:\n"
-            msg += create_summary(sender)
+            msg += create_summary(recipient)
             send(msg)
 
         elif cmd in ["!schieb", "!gib", "!zieh", "!nimm"]:
@@ -254,8 +271,7 @@ def handle_input(inp):
             if cmd in ["!zieh", "!nimm"]:
                 amount *= -1
 
-            balance[sender][recipient] -= amount
-            balance[recipient][sender] += amount
+            record(sender_number, sender, recipient, amount)
 
             p_balance = balance[sender][recipient]
 
@@ -276,8 +292,11 @@ def handle_input(inp):
 
             if w[2] in name2num:
                 recipient = w[2]
-            else:
+            elif sender_number in name2num:
                 recipient = num2name[sender_number]
+            else:
+                send("ERROR: recipient unknown")
+                continue
 
             parts, err = tanken.tanken(body[1:], amount)
 
@@ -290,8 +309,7 @@ def handle_input(inp):
                 msg += p[0] + ": {}km = {}\n".format(p[1][0], to_euro(p[1][1]))
                 if p[0] != recipient:
                     if p[0] in name2num:
-                        balance[recipient][p[0]] -= p[1][1]
-                        balance[p[0]][recipient] += p[1][1]
+                        record(sender_number, recipient, p[0], p[1][1])
                     else:
                         msg += p[0] + " not known. Please take care manually\n"
 
@@ -299,30 +317,53 @@ def handle_input(inp):
             msg += create_summary(recipient)
             send(msg)
 
+        elif cmd == "!fuck":
+            if not sender_number in num2name:
+                send("ERROR: you must register first")
+                continue
+
+            if not sender_number in last_change:
+                send("Nothing to rewind")
+                continue
+
+            changes = last_change[sender_number]
+
+            msg = num2name[sender_number] + ": sorry I fucked up!\n Rewinding:\n"
+            for change in changes:
+                msg += "{} -> {} {}\n".format(*change)
+                record(sender_number, change[1], change[0], change[2])
+
+            send(msg)
+
 
 def main():
     global group_id
     group_id = os.environ["GSB_GROUP_ID"]
 
-    global balance
     store_path = os.environ["GSB_STORE_PATH"]
     balance_path = store_path + "/balance.json"
     registration_path = store_path + "/registration.json"
+    last_change_path = store_path + "/last_change.json"
 
-    global name2num
-    global num2name
 
     global send_cmd
     send_cmd = os.environ["GSB_SEND_CMD"]
 
+    global balance
     if os.path.isfile(balance_path):
             balance = json.load(open(balance_path, "r"))
 
+    global name2num
+    global num2name
     if os.path.isfile(registration_path):
             name2num = json.load(open(registration_path, "r"))
             for name in name2num:
                 num2name[name2num[name]] = name
 
+    global last_change
+    if os.path.isfile(last_change_path):
+        last_change = json.load(open(last_cahnge_path, "r"))
+
     handle_input(sys.stdin.read())
 
     with open(balance_path, "w") as f:
@@ -331,5 +372,8 @@ def main():
     with open(registration_path, "w") as f:
         json.dump(name2num, f)
 
+    with open(last_change_path, "w") as f:
+        json.dump(last_change, f)
+
 if __name__ == "__main__":
     main()
-- 
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