Working version

Allows to query the Thekendienst calendar and report empty slots
to telegram.

cfg/check_next_7_days.json

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+{
+    "start_date": null,
+    "end_date": null,
+    "days_to_check": 7
+}

cfg/config_template.json

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+{
+    "teamup_api_key": "",
+    "calendar_id": "ksp4hsa93c1nt5kmym",
+    "telegram_bot_token": "",
+    "telegram_channels": [{"name": "ThekendienstBotTest", "id": -4558981107}],
+    "subcalendars_to_check": ["flexibler Thekendienst", "regelmäßiger Thekendienst"],
+    "timezone": "Europe/Berlin",
+    "header": "Es gibt noch offene Thekendienste für diese Woche\\!\nWer kann bitte im [Kalender](https://teamup.com/ksp4hsa93c1nt5kmym) eintragen und im 'HOBBYHIMMEL Thekenhelden' chat melden\\.\n\n",
+    "footer": "\\- Der freundliche Theckendiensterinnerungsbot",
+    "no_open_slots": "Juhu\\! Diese Woche gibt es keine offenen Slots\\!",
+    "appointment_motivator": "Da mache ich Theke\\.",
+    "time_slots": {
+        "Monday": {"start": "17:00", "end": "22:00"},
+        "Tuesday": {"start": "17:00", "end": "22:00"},
+        "Wednesday": {"start": "17:00", "end": "22:00"},
+        "Thursday": {"start": "17:00", "end": "22:00"},
+        "Friday": {"start": "15:00", "end": "22:00"},
+        "Saturday": {"start": "12:00", "end": "22:00"},
+        "Sunday": {"start": "12:00", "end": "20:00"}
+    }
+}

requirements.txt

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+python-telegram-bot==21.4
+requests==2.32.3
+urllib3==2.2.2

src/reportMissingThekendienst.py

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+from typing import List
+import urllib.parse
+import requests
+import json
+import sys
+from datetime import datetime, timedelta, time
+from zoneinfo import ZoneInfo
+from typing import NamedTuple
+import locale
+import urllib
+import telegram
+import asyncio
+
+
+class Subcalendar(NamedTuple):
+    name: str
+    id: int
+
+
+class TimeSlot(NamedTuple):
+    start: datetime
+    end: datetime
+
+    def covered(this, event):
+        event_start = datetime.strptime(event["start_dt"], "%Y-%m-%dT%H:%M:%S%z")
+        event_end = datetime.strptime(event["end_dt"], "%Y-%m-%dT%H:%M:%S%z")
+        is_covered = this.start >= event_start and this.end <= event_end
+        return is_covered
+
+
+def load_config(config_files):
+    config = {}
+    for config_file in config_files:
+        try:
+            with open(config_file, "r") as file:
+                config_content = json.load(file)
+            config.update(config_content)
+        except Exception as e:
+            print(f"Error loading configuration {config_file}: {e}")
+            sys.exit(1)
+
+    return config
+
+
+def fetch_subcalendar_ids(api_key, calendar_id):
+    headers = {"Teamup-Token": api_key}
+    url = f"https://api.teamup.com/{calendar_id}/subcalendars"
+    response = requests.get(url, headers=headers)
+    response.raise_for_status()
+    subcalendars = response.json().get("subcalendars", [])
+    return {sub["name"]: sub["id"] for sub in subcalendars}
+
+
+def fetch_events(
+    api_key: str,
+    calendar_id: str,
+    start_date: datetime,
+    end_date: datetime,
+    sub_calendars: List[Subcalendar],
+):
+    subcalendar_query = [
+        ("subcalendarId[]", sub_calendar.id) for sub_calendar in sub_calendars
+    ]
+    headers = {"Teamup-Token": api_key}
+    params = [
+        ("startDate", start_date.strftime("%Y-%m-%d")),
+        ("endDate", end_date.strftime("%Y-%m-%d")),
+        *subcalendar_query,
+    ]
+    url = f"https://api.teamup.com/{calendar_id}/events"
+    response = requests.get(url, headers=headers, params=params)
+    response.raise_for_status()
+    return response.json().get("events", [])
+
+
+def create_available_slots(
+    start_datetime: datetime, end_datetime: datetime
+) -> List[TimeSlot]:
+    available_slots = []
+    current_time = start_datetime
+    time_inc = timedelta(minutes=15)
+    while current_time < end_datetime:
+        available_slots.append(TimeSlot(current_time, current_time + time_inc))
+        current_time += time_inc
+    return available_slots
+
+
+def merge_slots(slots: List[TimeSlot]) -> List[TimeSlot]:
+    new_slots = []
+    if not slots:
+        return new_slots
+
+    current_slot = slots[0]._replace()
+    for slot in slots[1:]:
+        if current_slot.end == slot.start:
+            current_slot = current_slot._replace(end=slot.end)
+        else:
+            new_slots.append(current_slot)
+            current_slot = slot._replace()
+
+    new_slots.append(current_slot)
+
+    return new_slots
+
+
+def get_free_time_slots(
+    events, date: datetime, start_time: time, end_time: time
+) -> List[TimeSlot]:
+    start_datetime = date.replace(
+        hour=start_time.hour,
+        minute=start_time.minute,
+        second=start_time.second,
+        microsecond=0,
+    )
+    end_datetime = date.replace(
+        hour=end_time.hour,
+        minute=end_time.minute,
+        second=end_time.second,
+        microsecond=0,
+    )
+
+    available_slots = create_available_slots(start_datetime, end_datetime)
+
+    for event in events:
+        available_slots = [
+            available_slot
+            for available_slot in available_slots
+            if not available_slot.covered(event)
+        ]
+        if not available_slots:
+            break
+
+    return merge_slots(available_slots)
+
+
+async def send_telegram_message(bot_token, channels, message):
+    bot = telegram.Bot(bot_token)
+    lpo = telegram.LinkPreviewOptions(is_disabled=True)
+    for channel in channels:
+        await bot.sendMessage(
+            text=message,
+            parse_mode=telegram.constants.ParseMode.MARKDOWN_V2,
+            chat_id=channel["id"],
+            link_preview_options=lpo,
+        )
+    print("Message sent successfully!")
+
+
+def fetch_subcalendar_id_from_name(config) -> List[Subcalendar]:
+    subcalendar_ids = fetch_subcalendar_ids(
+        config["teamup_api_key"], config["calendar_id"]
+    )
+    interesting_calendars = config["subcalendars_to_check"]
+    subcalendars_to_check = [
+        Subcalendar(name, int(subcalendar_ids[name]))
+        for name in interesting_calendars
+        if name in subcalendar_ids
+    ]
+
+    calendar_not_found = False
+    for name in interesting_calendars:
+        if not name in subcalendar_ids:
+            print(f"Calendar {name} not found in response.")
+            calendar_not_found = True
+
+    if calendar_not_found:
+        print(f"Known calendars: {subcalendar_ids}")
+        sys.exit(1)
+
+    return subcalendars_to_check
+
+
+def convert_to_date(zone, text, days_to_check=None) -> datetime:
+    date = datetime.strptime(text, "%Y-%m-%d") if text else None
+
+    if date:
+        date = date.replace(tzinfo=zone)
+    else:
+        date = datetime.now(zone)
+        if days_to_check:
+            date += timedelta(days=days_to_check)
+
+    return date
+
+
+def parse_time(text: str) -> time:
+    return time.fromisoformat(text)
+
+
+def create_teamup_event_link(config, start: datetime, end: datetime) -> str:
+    format_string = "%Y-%m-%d %H:%M:%S"
+    url_start = urllib.parse.quote(start.strftime(format_string))
+    url_end = urllib.parse.quote(end.strftime(format_string))
+    return f"https://teamup.com/{config['calendar_id']}/events/new?start_dt={url_start}&end_dt={url_end}"
+
+
+async def check_slots_and_notify(config: map, dry_run: bool = False) -> None:
+
+    sub_calendars = fetch_subcalendar_id_from_name(config)
+
+    tzone = ZoneInfo(config["timezone"])
+    start_date = convert_to_date(tzone, config.get("start_date")).replace(
+        hour=0, minute=0, second=0, microsecond=0
+    ) + timedelta(days=1)
+    end_date = convert_to_date(
+        tzone, config.get("end_date"), config.get("days_to_check", 7)
+    ).replace(hour=23, minute=59, second=59, microsecond=999)
+
+    print(
+        f"Checking Thekendienst between ({start_date:%A}) {start_date:%Y-%m-%d} and ({end_date:%A}) {end_date:%Y-%m-%d}."
+    )
+
+    events = fetch_events(
+        config["teamup_api_key"],
+        config["calendar_id"],
+        start_date,
+        end_date,
+        sub_calendars,
+    )
+
+    print(
+        f"Found {len(events)} events in the time range for calendars '{"', '".join(sub_calendar.name for sub_calendar in sub_calendars)}'."
+    )
+
+    message = ""
+    for i in range((end_date - start_date).days + 1):
+        check_date = start_date + timedelta(days=i)
+        day_of_week = check_date.strftime("%A")  # Get the day name, e.g., 'Monday'
+
+        if day_of_week in config["time_slots"]:
+            start_time = parse_time(config["time_slots"][day_of_week]["start"])
+            end_time = parse_time(config["time_slots"][day_of_week]["end"])
+
+            free_time_slots = get_free_time_slots(
+                events, check_date, start_time, end_time
+            )
+
+            # kind of a hack but I don't want to install any packages
+            old_locale = locale.getlocale()
+            locale.setlocale(locale.LC_ALL, "de_DE.utf8")
+
+            if free_time_slots:
+                free_slots = "\n                             ".join(
+                    [
+                        f"`{slot.start:%H:%M} - {slot.end:%H:%M}` \- [{config["appointment_motivator"]}]({create_teamup_event_link(config, slot.start, slot.end)}) 💪"
+                        for slot in free_time_slots
+                    ]
+                )
+                message += f"🚨 `{free_time_slots[0].start:%a}, {free_time_slots[0].start:%d\\.%m\\.} `{free_slots}\n"
+            locale.setlocale(locale.LC_ALL, old_locale)
+
+    if message:
+        message = config["header"] + message + "\n" + config["footer"]
+    else:
+        message = config["no_open_slots"]
+
+    if dry_run:
+        print("Messsage that would be sent on Telegram:")
+        print(message)
+    else:
+        await send_telegram_message(
+            config["telegram_bot_token"], config["telegram_channels"], message
+        )
+
+
+if __name__ == "__main__":
+    default_config_file = "reportMissingThekendienstConfig.json"
+    dry_run = "--dry-run" in sys.argv
+    config_files = [arg for arg in sys.argv[1:] if arg != "--dry-run"]
+    if not config_files:
+        config_files = [default_config_file]
+    config = load_config(config_files)
+
+    loop = asyncio.new_event_loop()
+    tasks = [loop.create_task(check_slots_and_notify(config, dry_run=dry_run))]
+    loop.run_until_complete(asyncio.wait(tasks))
+    loop.close()