import json
from google.oauth2 import service_account
from googleapiclient.discovery import build


def create_event(key, calendar_id, impersonator, summary, description, start, end, location, attendees, reminders):
    """
    Creates a calendar event via Google Calendar API.

    Arguments:
        key: str : Service account credentials JSON string
        calendar_id: str : Email address of the Google Calendar account
        impersonator: str : Email address of the user to impersonate (domain-wide delegation)
        summary: str : Event title
        description: str : Event description
        start: str : Start date/time in ISO format
        end: str : End date/time in ISO format
        location: str : Event location (address)
        attendees: list : List of dicts with 'email' keys
        reminders: list : List of dicts with 'method' and 'minutes' keys

    Returns:
        Created event object from Google Calendar API
    """
    event = {
        'summary': summary,
        'description': description,
        'start': {
            'dateTime': start,
            'timeZone': 'America/Detroit',
        },
        'end': {
            'dateTime': end,
            'timeZone': 'America/Detroit',
        },
        'location': location,
        'attendees': attendees,
        'reminders': {
            'useDefault': False,
            'overrides': reminders,
        }
    }

    service_account_key = json.loads(key) if isinstance(key, str) else key
    scopes = ['https://www.googleapis.com/auth/calendar']
    credentials = service_account.Credentials.from_service_account_info(
        service_account_key, scopes=scopes, subject=impersonator
    )
    service = build('calendar', 'v3', credentials=credentials)
    return service.events().insert(calendarId=calendar_id, body=event).execute()