# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1421192965 -3600
# Node ID 185b93f6376ff45e637c249ce2de924288217321
# Parent  dc9a25250a462c6de0eaac883ee00e0018172578
Added some support for updating participation status on events.

diff -r dc9a25250a46 -r 185b93f6376f imip_manager.py
--- a/imip_manager.py	Tue Jan 13 23:37:56 2015 +0100
+++ b/imip_manager.py	Wed Jan 14 00:49:25 2015 +0100
@@ -31,7 +31,7 @@
 
 from imiptools.content import Handler, get_address, \
                               get_item, get_uri, get_utc_datetime, get_value, \
-                              get_values, parse_object, to_part
+                              get_value_map, get_values, parse_object, to_part
 from imiptools.dates import format_datetime, get_datetime, get_start_of_day, \
                             to_timezone
 from imiptools.mail import Messenger
@@ -126,12 +126,15 @@
 
     # Action methods.
 
-    def process_request(self, accept):
+    def process_request(self, accept, update=False):
 
         """
         Process the current request for the given 'user', accepting any request
         when 'accept' is true, declining requests otherwise. Return whether any
         action was taken.
+
+        If 'update' is given, the sequence number will be incremented in order
+        to override any previous response.
         """
 
         # When accepting or declining, do so only on behalf of this user,
@@ -146,6 +149,10 @@
                 if self.messenger and self.messenger.sender != get_address(attendee):
                     attendee_attr["SENT-BY"] = get_uri(self.messenger.sender)
                 self.details["ATTENDEE"] = [(attendee, attendee_attr)]
+                if update:
+                    sequence = self.get_value("SEQUENCE") or "0"
+                    self.details["SEQUENCE"] = [(str(int(sequence) + 1), {})]
+
                 self.send_message(get_address(attendee))
 
                 return True
@@ -260,9 +267,12 @@
 
     # Request logic and page fragment methods.
 
-    def handle_request(self, uid, request):
+    def handle_request(self, uid, request, queued):
 
-        "Handle actions involving the given 'uid' and 'request' object."
+        """
+        Handle actions involving the given 'uid' and 'request' object, where
+        'queued' indicates that the object has not yet been handled.
+        """
 
         # Handle a submitted form.
 
@@ -271,12 +281,13 @@
 
         accept = args.has_key("accept")
         decline = args.has_key("decline")
+        update = not queued and args.has_key("update")
 
         if accept or decline:
 
             handler = ManagerHandler(request, self.user, self.messenger)
 
-            if handler.process_request(accept):
+            if handler.process_request(accept, update):
 
                 # Remove the request from the list.
 
@@ -296,11 +307,32 @@
 
         return handled
 
-    def show_request_form(self):
+    def show_request_form(self, obj, needs_action):
+
+        """
+        Show a form for a request concerning 'obj', indicating whether action is
+        needed if 'needs_action' is specified as a true value.
+        """
+
+        details = self._get_details(obj)
+
+        attendees = get_value_map(details, "ATTENDEE")
+        attendee_attr = attendees.get(self.user)
 
-        "Show a form for a request."
+        if attendee_attr:
+            partstat = attendee_attr.get("PARTSTAT")
+            if partstat == "ACCEPTED":
+                self.page.p("This request has been accepted.")
+            elif partstat == "DECLINED":
+                self.page.p("This request has been declined.")
+            else:
+                self.page.p("This request has been ignored.")
 
-        self.page.p("Action to take for this request:")
+        if needs_action:
+            self.page.p("An action is required for this request:")
+        else:
+            self.page.p("This request can be updated as follows:")
+
         self.page.form(method="POST")
         self.page.p()
         self.page.input(name="accept", type="submit", value="Accept")
@@ -308,6 +340,8 @@
         self.page.input(name="decline", type="submit", value="Decline")
         self.page.add(" ")
         self.page.input(name="ignore", type="submit", value="Ignore")
+        if not needs_action:
+            self.page.input(name="update", type="hidden", value="true")
         self.page.p.close()
         self.page.form.close()
 
@@ -413,7 +447,7 @@
             return False
 
         is_request = uid in self._get_requests()
-        handled = is_request and self.handle_request(uid, obj)
+        handled = self.handle_request(uid, obj, is_request)
 
         if handled:
             return True
@@ -422,8 +456,7 @@
 
         self.show_object_on_page(uid, obj)
 
-        if is_request and not handled:
-            self.show_request_form()
+        self.show_request_form(obj, is_request and not handled)
 
         return True