From a5c8d284ee60e12ba08e2e075e06749c239f6dbf Mon Sep 17 00:00:00 2001
From: "Lennart J. Kurzweg (Nx2)" <git@nx2.site>
Date: Thu, 30 Jan 2025 13:41:27 +0100
Subject: [PATCH] calendar-lec

---
 configuration.nix               |  1 +
 home-modules/calendar.nix       |  2 +-
 system-modules/calendar-lec.nix | 97 +++++++++++++++++++++++++++++++++
 3 files changed, 99 insertions(+), 1 deletion(-)
 create mode 100644 system-modules/calendar-lec.nix

diff --git a/configuration.nix b/configuration.nix
index fdc5800..5a4cde4 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -44,6 +44,7 @@
     ./system-modules/postgres.nix
     ./system-modules/nx2site/proxy.nix
     ./system-modules/calendar-publish.nix
+    ./system-modules/calendar-lec.nix
     ./system-modules/nx2site/audiobookshelf.nix
     ./system-modules/nx2site/gitea.nix
     ./system-modules/nx2site/open-web-calendar.nix
diff --git a/home-modules/calendar.nix b/home-modules/calendar.nix
index 27069f5..c728d35 100644
--- a/home-modules/calendar.nix
+++ b/home-modules/calendar.nix
@@ -35,7 +35,7 @@
     }
     {
       name = "LEC";
-      url = "https://zlypher.github.io/lol-events/cal/league-of-legends-lec.ical";
+      url = "https://${domain}/lec.ics";
       color = "#A87000";
       read-only = true;
       type = "ics";
diff --git a/system-modules/calendar-lec.nix b/system-modules/calendar-lec.nix
new file mode 100644
index 0000000..0fd5742
--- /dev/null
+++ b/system-modules/calendar-lec.nix
@@ -0,0 +1,97 @@
+{ config, pkgs, user, domain, ... }:
+{
+  systemd.timers."nx_cal_lec" = {
+    enable = true;
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnBootSec = "40m";
+      OnUnitActiveSec = "24h";
+      Unit = "nx_cal_lec.service";
+    };
+  };
+
+  systemd.services."nx_cal_lec" = {
+    script = let 
+      nx_cal_lec = (pkgs.writers.writePython3Bin "nx_cal_lec" {
+      libraries = with pkgs.python3Packages; [
+        ical
+        ics
+        requests
+        dateutils
+      ];
+      flakeIgnore = [ "E302" "E305" "E226" "E501" ];
+    } /*python */ ''
+import hashlib
+from ics import Calendar
+import requests
+from datetime import timedelta
+
+def get_event_hash(event):
+    """
+    Generate a unique hash for an event based on its details.
+    """
+    event_data = f"{event.name}{event.begin}{event.end}{event.description}"
+    return hashlib.md5(event_data.encode('utf-8')).hexdigest()
+
+def adjust_events(events):
+    """
+    Adjust overlapping events to ensure they do not conflict.
+    """
+    sorted_events = sorted(events, key=lambda e: e.begin)
+    for i in range(1, len(sorted_events)):
+        previous_event = sorted_events[i - 1]
+        current_event = sorted_events[i]
+
+        if current_event.begin < previous_event.end:
+            # Adjust the start time of the current event to just after the previous event
+            current_event.begin = previous_event.end + timedelta(minutes=1)
+            print(f"Adjusted event '{current_event.name}' to start at {current_event.begin} and end at {current_event.end}")
+    return sorted_events
+
+def fetch_and_save_ical_events(ical_url, save_path):
+    """
+    Fetch events from an iCal URL and save them as a single combined calendar.
+    """
+    try:
+        # Fetch the iCal data
+        response = requests.get(ical_url)
+        response.raise_for_status()
+
+        # Parse the iCal data
+        calendar = Calendar(response.text)
+
+        # Adjust events
+        adjusted_events = adjust_events(list(calendar.events))
+
+        # Create a new combined calendar
+        combined_calendar = Calendar()
+        for event in adjusted_events:
+            combined_calendar.events.add(event)
+
+        # Save the combined calendar to a single .ics file
+        with open(save_path, 'w') as file:
+            file.writelines(combined_calendar.serialize_iter())
+
+        print(f"Saved combined calendar to {save_path}")
+
+    except requests.exceptions.RequestException as e:
+        print(f"Error fetching iCal data: {e}")
+    except Exception as e:
+        print(f"Error processing iCal data: {e}")
+
+if __name__ == "__main__":
+    # Replace with your iCal URL and target file path
+    ICAL_URL = "https://zlypher.github.io/lol-events/cal/league-of-legends-lec.ical"
+    SAVE_PATH = "${config.services.nginx.virtualHosts."${domain}".root}/lec.ics"
+
+    fetch_and_save_ical_events(ICAL_URL, SAVE_PATH)
+'');
+    in ''
+      ${nx_cal_lec}/bin/nx_cal_lec
+    '';
+    serviceConfig = {
+      Type = "oneshot";
+      User = "nx2";
+    };
+  };
+}