From 5c4db272a797cd3be03328d637df9fd330d55fb5 Mon Sep 17 00:00:00 2001
From: mrsu <contact@sjplab.com>
Date: Sun, 4 Feb 2024 02:53:30 +0000
Subject: [PATCH] inital commit

---
 remindme_caldav.py | 111 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 remindme_caldav.py

diff --git a/remindme_caldav.py b/remindme_caldav.py
new file mode 100644
index 0000000..28986a4
--- /dev/null
+++ b/remindme_caldav.py
@@ -0,0 +1,111 @@
+from icalendar import Calendar, Event, vRecur
+from dateutil.relativedelta import relativedelta
+from dateutil.rrule import rruleset, rrulestr
+import datetime as dt
+from datetime import date, time
+import glob
+import os
+import time
+from watchdog.observers import Observer
+from watchdog.events import FileSystemEventHandler
+
+# Get all .ics files from your directory
+files = glob.glob(os.path.join('/home/mrsu/.local/share/caldav/personal-calendar/default', '*.ics'))
+
+def calculate_recur_dates(dtstart, vrecur):
+    rule_str = "RRULE:{}".format(vrecur.to_ical().decode('utf-8'))
+    start_date = dtstart
+    if vrecur.get("COUNT") is None:
+        # If it doesn't, calculate an end date based on FREQ and INTERVAL
+        freq = vrecur.get('FREQ')[0]  # Get the first frequency (e.g., 'DAILY', 'WEEKLY', etc.)
+        interval = vrecur.get('INTERVAL')[0]
+        
+        delta = None
+    
+        if freq == "DAILY":
+            delta = relativedelta(days=interval)
+        elif freq == "MONTHLY":
+            delta = relativedelta(months=interval)
+        elif freq == "YEARLY":
+            delta = relativedelta(years=interval)
+        
+        count = 0
+        current_date = dt.datetime.today().date()
+        origin_date = start_date.date() if isinstance(start_date, dt.datetime) else start_date
+        while origin_date < current_date:
+            count += interval
+            origin_date += delta*interval
+            
+        rule_str += ";COUNT={}".format(count+10)
+    else:
+        None
+        # If 'COUNT' exists, set it to a high number so that the rrulestr method will stop generating dates after the specified count
+        #rule_str += ";UNTIL=21001231T000000Z"  # This sets an end date far in the future
+        
+    ruleset = rrulestr(rule_str, dtstart=start_date)
+    
+    # Generate future dates according to the rules
+    dates = list(ruleset)
+    return [d for d in dates][1:] # Remove first date as the same as start_date
+    
+def calendar_parser(cal_str):
+    # Parse the calendar
+    cal = Calendar.from_ical(cal_str)
+
+    for component in cal.walk():
+        if component.name == "VEVENT":  # If it's a VEVENT, create a new event dictionary
+            uid = component.get("UID")
+            dtstart = component.get("DTSTART").dt 
+            summary = component.get("SUMMARY")
+            vrecur = component.get("RRULE")
+            recur_dates = [None]
+            if vrecur is not None:
+                recur_dates = calculate_recur_dates(dtstart, vrecur)
+
+            valarm_list = []  # List to hold all VALARM for this event
+            for subcomponent in component.walk():  # Find all VALARMs for this VEVENT
+                if subcomponent.name == "VALARM":
+                    valarm = Event.from_ical(subcomponent.to_ical())
+                    timedelta = valarm.get("TRIGGER").dt
+                    valarm_list.append(timedelta)    # Add this VALARM to the list
+                    
+            return {"uid": str(uid), "dtstart": dtstart, "summary": summary, "recur_dates": recur_dates, "valarm": valarm_list, "alert_triggered": [False*len(valarm_list)]}
+
+event_list = []  # List to hold dictionaries for each event
+for file in files:
+    with open(file, 'r') as f:
+        cal_str = f.read()
+    event_dict = calendar_parser(cal_str)
+    event_list.append(event_dict)
+
+class FileChangeHandler(FileSystemEventHandler):
+    def on_modified(self, event):
+        if not event.is_directory:  # If it's a file and not a directory
+            print("Updating events")
+            with open(event.src_path, 'r') as f:
+                cal_str = f.read()
+            
+            # Parse the calendar
+            event_dict = calendar_parser(cal_str)
+            event_list.append(event_dict)
+
+observer = Observer()
+handler = FileChangeHandler()
+observer.schedule(handler, '/home/mrsu/.local/share/caldav/personal-calendar/default', recursive=True)
+observer.start()
+try:
+    while True:
+        current_time = dt.datetime.now()
+        for event in event_list:
+            None
+            #event["valarm"] = [a if isinstance(a, dt.datetime) else dt.datetime.combine(a, dt.datetime.min.time()) for a in event["valarm"]]
+            #print(event["summary"], event["freq"], current_time, [str(i.replace(tzinfo=None)) for i in event['valarm']], event["dtstart"])
+            print(event["summary"], str(event["dtstart"]), [str(i) for i in event["recur_dates"]])#,  [str(alarm_time) for alarm_time in event['valarm']])
+#            if any(abs(current_time - alarm_time.total_seconds() <= 1 for alarm_time in event['valarm']) and event["alert_triggered"][0] is False:
+#                print("Alert for event with UID:", event["uid"], "Summary:", event["summary"])
+#                event["alert_triggered"][0] = True
+                
+        time.sleep(1)   # Wait for a second before checking again
+except KeyboardInterrupt:
+    observer.stop()
+observer.join()