import requests
import datetime as dt
import json

def find_event(token, calendar_id,timezone, name):
    url = f"https://www.googleapis.com/calendar/v3/calendars/{calendar_id}/events"
    params = {
        "q": name,
        "timeZone": timezone
    }
    header = {"Authorization": f"Bearer {token}"}

    response = requests.get(url = url, headers = header, params = params)
    if response.status_code == 401:
        return "verify"

    events_list = response.json()["items"]
    for i in events_list:
        if i["summary"] == name:
            return i
    return "not found"

def create_event(token, calendar_id, event):

    duplicate_check = find_event(token, calendar_id, event["timezone"], event["name"])
    if duplicate_check == "verify":
        return "verify"
    elif duplicate_check != "not found":
        return "duplicate event"

    url = f"https://www.googleapis.com/calendar/v3/calendars/{calendar_id}/events"
    payload = {
        "summary": event["name"],
        "start": {
            "dateTime": event["start"].strftime("%Y-%m-%dT%H:%M:%S"),
            "timeZone": event["timezone"]
        },
        "end": {
            "dateTime": event["end"].strftime("%Y-%m-%dT%H:%M:%S"),
            "timeZone": event["timezone"]
        },
        "description": " ".join([(event["start"] + dt.timedelta(days = i)).strftime("%Y-%m-%d") for i in range((event["end"] - event["start"]).days + 1)])
    }
    header = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    response = requests.post(url = url, headers = header, json = payload)
    if response.status_code == 401:
        return "verify"

    return "success"

def cancel_event(token, calendar_id, timezone, name):

    event = find_event(token, calendar_id, timezone, name)

    if event == "verify":
        return "verify"
    elif event == "not found":
        return "no event"

    url = f"https://www.googleapis.com/calendar/v3/calendars/{calendar_id}/events/{event['id']}"
    header = {"Authorization": f"Bearer {token}"}
    response = requests.delete(url = url, headers = header)
    if response.status_code == 401:
        return "verify"

    return "success"

def shift_event(token, calendar_id, timezone, name, new_start):

    event = find_event(token, calendar_id, timezone, name)

    if event == "verify":
        return "verify"
    elif event == "not found":
        return "no event"

    if event["start"]["dateTime"][-1] == "Z":
        event["start"]["dateTime"], event["end"]["dateTime"] = event["start"]["dateTime"][0:-1] + "+00:00", event["end"]["dateTime"][0:-1] + "+00:00"

    event_start, event_end = dt.datetime.strptime(event["start"]["dateTime"][0:-6], "%Y-%m-%dT%H:%M:%S"), dt.datetime.strptime(event["end"]["dateTime"][0:-6], "%Y-%m-%dT%H:%M:%S")
    new_end = new_start + (event_end - event_start)
    event["start"]["dateTime"], event["end"]["dateTime"] = new_start.strftime("%Y-%m-%dT%H:%M:%S"), new_end.strftime("%Y-%m-%dT%H:%M:%S")
    event["description"] = " ".join([(new_start + dt.timedelta(days = i)).strftime("%Y-%m-%d") for i in range((new_end - new_start).days + 1)])

    url = f"https://www.googleapis.com/calendar/v3/calendars/{calendar_id}/events/{event['id']}"
    header = {"Authorization": f"Bearer {token}"}
    response = requests.put(url = url, headers = header, json = event)
    if response.status_code == 401:
        return "verify"

    return "success"

def find_event_date(token, calendar_id, timezone, name):

    event = find_event(token, calendar_id, timezone, name)
    if event == "verify":
        return "verify"
    elif event == "not found":
        return "no event"

    if event["start"]["dateTime"][-1] == "Z":
        event["start"]["dateTime"], event["end"]["dateTime"] = event["start"]["dateTime"][0:-1] + "+00:00", event["end"]["dateTime"][0:-1] + "+00:00"

    return dt.datetime.strptime(event["start"]["dateTime"][0:-6], "%Y-%m-%dT%H:%M:%S"), dt.datetime.strptime(event["end"]["dateTime"][0:-6], "%Y-%m-%dT%H:%M:%S")

def find_date(token, calendar_id, timezone, date):

    url = f"https://www.googleapis.com/calendar/v3/calendars/{calendar_id}/events"
    params = {
        "q": date.strftime("%Y-%m-%d"),
        "timeZone": timezone
    }
    header = {"Authorization": f"Bearer {token}"}
    response = requests.get(url = url, headers = header, params = params)
    if response.status_code == 401:
        return "verify"

    events_list = response.json()["items"]
    names = [f'{i["summary"]}: {i["start"]["dateTime"][11:13]}:{i["start"]["dateTime"][14:16]} - {i["end"]["dateTime"][11:13]}:{i["end"]["dateTime"][14:16]}' for i in events_list if date.strftime("%Y-%m-%d") in i["description"]]
    return names

def get_calendar(token, timezone):

    header = {"Authorization": f"Bearer {token}"}
    calendar_response = requests.get(url = "https://www.googleapis.com/calendar/v3/users/me/calendarList", headers = header)
    if calendar_response.status_code == 401:
        return "verify"

    calendars = calendar_response.json()["items"]
    for i in calendars:
        if i["summary"] == "Jackson Secretary":
            return i["id"]

    header["Content-Type"] = "application/json"
    payload = {
        "summary": "Jackson Secretary",
    }
    calendar_response = requests.post(url = "https://www.googleapis.com/calendar/v3/calendars", headers = header, json = payload)
    if calendar_response.status_code == 401:
        return "verify"

    return calendar_response.json()["id"]

def execute_json(token, calendar_id, timezone, json_str):

    try:
        json_obj = json.loads(json_str)
    except:
        return "invalid"

    result = {
        "schedule": lambda token, calendar_id, timezone, json_obj: create_event(token, calendar_id, {
            "name": json_obj[1],
            "start": dt.datetime.strptime(json_obj[2], "%Y-%m-%d%H:%M"),
            "end": (dt.datetime.strptime(json_obj[2], "%Y-%m-%d%H:%M") + dt.timedelta(hours = 1)) if len(json_obj) == 3 else dt.datetime.strptime(json_obj[3], "%Y-%m-%d%H:%M"),
            "timezone": timezone
        }),
        "cancel": lambda token, calendar_id, timezone, json_obj: cancel_event(token, calendar_id, timezone, json_obj[1]),
        "shift": lambda token, calendar_id, timezone, json_obj: shift_event(token, calendar_id, timezone, json_obj[1], dt.datetime.strptime(json_obj[2], "%Y-%m-%d%H:%M")),
        "event-query": lambda token, calendar_id, timezone, json_obj: find_event_date(token, calendar_id, timezone, json_obj[1]),
        "time-query": lambda token, calendar_id, timezone, json_obj: find_date(token, calendar_id, timezone, dt.datetime.strptime(json_obj[1], "%Y-%m-%d")),
    }[json_obj[0]](token, calendar_id, timezone, json_obj)

    if result == "verify":
        return "verify"

    if json_obj[0] == "schedule":

        if result == "success":
            return f"Event {json_obj[1]} scheduled successfully"
        elif result == "duplicate event":
            return "Event already exists"

    elif json_obj[0] == "cancel":

        if result == "success":
            return f"Event {json_obj[1]} cancelled successfully"
        elif result == "no event":
            return "Event not found"

    elif json_obj[0] == "shift":

        if result == "success":
            return f"Event {json_obj[1]} shifted successfully"
        elif result == "no event":
            return "Event not found"

    elif json_obj[0] == "event-query":

        if result == "no event":
            return "Event not found"
        else:
            return f"Event {json_obj[1]} is scheduled from {result[0].strftime('%d/%m/%Y at %H:%M')} to {result[1].strftime('%d/%m/%Y at %H:%M')}"

    elif json_obj[0] == "time-query":

        if len(result):
            return "Events: \n- " + "\n- ".join(result)
        return "No events scheduled for the day"