Add ability to clone schedule data from another week

tailbone/templates/shifts/schedule_edit.mako

@@ -199,6 +199,38 @@
             }
         });
 
+        $('#copy-week').datepicker({
+            dateFormat: 'mm/dd/yy'
+        });
+
+        $('.copy-schedule').click(function() {
+            $('#copy-details').dialog({
+                modal: true,
+                title: "Copy from Another Week",
+                width: '500px',
+                buttons: [
+                    {
+                        text: "Copy Schedule",
+                        click: function(event) {
+                            if (! $('#copy-week').val()) {
+                                alert("You must specify the week from which to copy shift data.");
+                                $('#copy-week').focus();
+                                return;
+                            }
+                            $(event.target).button('disable').button('option', 'label', "Copying Schedule...");
+                            $('#copy-schedule-form').submit();
+                        }
+                    },
+                    {
+                        text: "Cancel",
+                        click: function() {
+                            $('#copy-details').dialog('close');
+                        }
+                    }
+                ]
+            });
+        });
+
     });
   </script>
   <style type="text/css">
@@ -254,6 +286,7 @@
     <button type="button" class="save-changes" disabled="disabled">Save Changes</button>
     <button type="button" class="undo-changes" disabled="disabled">Undo Changes</button>
     <button type="button" class="clear-schedule">Clear Schedule</button>
+    <button type="button" class="copy-schedule">Copy Schedule From...</button>
   </div>
 </%def>
 
@@ -270,6 +303,22 @@ ${h.end_form()}
   <button type="button" id="add-shift">Add Shift</button>
 </div>
 
+<div id="copy-details" style="display: none;">
+  <p>
+    This tool will replace the currently visible schedule, with one from
+    another week.
+  </p>
+  <p>
+    <strong>NOTE:</strong>&nbsp; If you do this, all shifts in the current
+    schedule will be <em>removed</em>,
+    and then new shifts will be created based on the week you specify.
+  </p>
+  ${h.form(url('schedule.edit'), id='copy-schedule-form')}
+  <label for="copy-week">Copy from week:</label>
+  ${h.text('copy-week')}
+  ${h.end_form()}
+</div>
+
 <div id="snippets">
   <div class="shift" data-uuid="">
     ${h.text('edit_start_time')} thru ${h.text('edit_end_time')}

tailbone/views/shifts/schedule.py

@@ -29,7 +29,7 @@ from __future__ import unicode_literals, absolute_import
 import datetime
 
 from rattail.db import model
-from rattail.time import localtime, make_utc
+from rattail.time import localtime, make_utc, get_sunday
 
 from pyramid_simpleform import Form
 
@@ -54,6 +54,12 @@ class ScheduleView(TimeSheetView):
             self.request.session.flash("Removed {} shifts from current schedule.".format(count))
             return self.redirect(self.request.route_url('schedule.edit'))
 
+        # okay then, check if we should copy data from another week
+        if self.request.method == 'POST' and self.request.POST.get('copy-week'):
+            sunday, copied = self.copy_schedule()
+            self.request.session.flash("Copied {} shifts from week of {}".format(copied, sunday.strftime('%m/%d/%Y')))
+            return self.redirect(self.request.route_url('schedule.edit'))
+
         # okay then, process filters; redirect if any were received
         form = Form(self.request, schema=ShiftFilter)
         self.process_filter_form(form)
@@ -129,6 +135,44 @@ class ScheduleView(TimeSheetView):
                 deleted += 1
         return deleted
 
+    def copy_schedule(self):
+        """
+        Clear current schedule, then copy shift data from another week.
+        """
+        try:
+            sunday = datetime.datetime.strptime(self.request.POST['copy-week'], '%m/%d/%Y').date()
+        except ValueError as error:
+            self.request.session.flash("Invalid date specified: {}: {}".format(type(error), error), 'error')
+            raise self.redirect(self.request.route_url('schedule.edit'))
+        sunday = get_sunday(sunday)
+        context = self.get_timesheet_context()
+        if sunday == context['date']:
+            self.request.session.flash("Cannot copy schedule from same week; please specify a different week.", 'error')
+            raise self.redirect(self.request.route_url('schedule.edit'))
+
+        self.clear_schedule()
+
+        copied = 0
+        if context['employees']:
+            offset = context['date'] - sunday
+            sunday = datetime.datetime.combine(sunday, datetime.time(0))
+            start_time = localtime(self.rattail_config, sunday)
+            end_time = localtime(self.rattail_config, sunday + datetime.timedelta(days=7))
+            shifts = Session.query(model.ScheduledShift)\
+                            .filter(model.ScheduledShift.employee_uuid.in_([e.uuid for e in context['employees']]))\
+                            .filter(model.ScheduledShift.start_time >= make_utc(start_time))\
+                            .filter(model.ScheduledShift.end_time < make_utc(end_time))
+            for shift in shifts:
+                Session.add(model.ScheduledShift(
+                    employee_uuid=shift.employee_uuid,
+                    store_uuid=shift.store_uuid,
+                    start_time=shift.start_time + offset,
+                    end_time=shift.end_time + offset,
+                ))
+                copied += 1
+
+        return sunday, copied
+
     @classmethod
     def defaults(cls, config):
         cls._defaults(config)