"""
script for regularly sending updates on shares and news based on user interval
"""
__author__ = "Florian Kellermann, Linus Eickhoff"
__date__ = "10.05.2022"
__version__ = "1.0.2"
__license__ = "None"

import os
import sys
import time

from apscheduler.schedulers.background import BackgroundScheduler # scheduler for cron
from dotenv import load_dotenv

import helper_functions as hf
import news.news_fetcher as news_fetcher
import shares.share_fetcher as share_fetcher
from api_handling.api_handler import API_Handler
from bot import bot

'''
* * * * * code
┬ ┬ ┬ ┬ ┬
│ │ │ │ │
│ │ │ │ └──── weekday (0->Monday, 7->Sunday)
│ │ │ └────── Month (1-12)
│ │ └──────── Day (1-31)
│ └────────── Hour (0-23)
└──────────── Minute (0-59)

example 0 8 * * * -> daily update at 8am
'''
user_ids = []
user_crontab = []

load_dotenv(dotenv_path='.env')


def start_updater():
    """ starting function for regularly sending updates
    :raises: none

    :rtype: none
    """

    print("Bot updates started")

    my_handler = API_Handler(os.getenv("API_URL"), str(os.getenv("BOT_EMAIL")), str(os.getenv("BOT_PASSWORD")))

    update_crontab(my_handler)


def update_crontab(p_my_handler):
    """ Updating crontab lists every hour
    :type pCurrent_Time: time when starting crontab update
    :param pCurrent_Time: datetime

    :raises: none

    :rtype: none
    """

    global user_crontab
    global user_ids
    
    all_users = p_my_handler.get_all_users() # get all users so crontabs can update for everybody
    
    if all_users == None:
        print("No users found, trying again.")
        update_crontab(p_my_handler)
        return
    
    user_ids = []
    user_crontab = []

    for element in all_users:
        if element["cron"] != '' and element["telegram_user_id"] != '': # check if both values are existing so I have consistent data
            try:
                user_ids.append(int(element["telegram_user_id"]))
                try:
                    user_crontab.append(str(element["cron"]))
                except: 
                    user_ids.pop() # if something goes wrong with cron I have to delete matching user id 
            except: continue
                
    
    print(user_ids)

    update_based_on_crontab(user_ids, user_crontab, p_my_handler)
    
    update_crontab(p_my_handler) # restart the update after time sleep
    
    
def update_based_on_crontab(p_user_ids, p_user_crontab, p_my_handler):
    """ Check all the crontab codes and add jobs to start in time
    :type p_user_ids: array
    :param p_user_ids: user id array of all users

    :type p_user_crontab: array
    :param p_user_crontab: crontabs for all users equivalent to the user array

    :type p_my_handler: Api_Handler
    :param p_my_handler: get database stuff

    :raises: none

    :rtype: none
    """
    
    my_scheduler = BackgroundScheduler() # schedule sends based on cron
    
    for i in range(len(p_user_ids)):
        cron_split = p_user_crontab[i].split(" ") # split it up to use in scheduler
        print(cron_split[4], cron_split[1], cron_split[0], cron_split[3], cron_split[2])
        my_scheduler.add_job(update_for_user, 'cron', day_of_week=cron_split[4], hour=cron_split[1], minute=cron_split[0], month=cron_split[3], day=cron_split[2], args=(p_user_ids[i], p_my_handler))

    my_scheduler.start()
    
    time.sleep( 600 ) # scheduler runs in background and I wait 10mins
    my_scheduler.shutdown() # after this the new crontabs will be loaded
                    
def update_for_user(p_user_id, p_my_handler):
    """ Pull shares and send updates for specific user id
    :type p_user_id: integer
    :param p_user_id: user id of user that shall receive update

    :type p_my_handler: Api_Handler
    :param p_my_handler: handle the api and pull from database

    :raises: none

    :rtype: none
    """
    share_symbols = []
    share_amounts = []
    
    my_portfolio = p_my_handler.get_user_portfolio(p_user_id) # get all existing shares for user
    
    for element in my_portfolio:
        if element["count"] != '' and element["isin"] != '':
            print(element["count"], element["isin"])
            share_symbols.append(element["isin"])
            share_amounts.append(element["count"])

    my_user = p_my_handler.get_user(p_user_id)
    send_to_user("Hello %s this is your share update for today:"%str(my_user["username"]), pUser_id=p_user_id)
    
    shares = p_my_handler.get_user_shares(p_user_id) # all interest shares
    
    if len(share_symbols) != 0: # iterate through all shares
        for i in range(len(share_symbols)):
            my_price = share_fetcher.get_share_price_no_currency(share_symbols[i])
            my_update_message = f'{share_fetcher.get_share_information_markdown(share_symbols[i])}\ncount: {hf.make_markdown_proof(share_amounts[i])}\nTotal: {hf.make_markdown_proof(round(float(my_price) * float(share_amounts[i]), 2))} EUR'
            bot.send_message(chat_id=p_user_id, text=my_update_message, parse_mode="MARKDOWNV2")
    else:
        send_to_user("No shares found for your account. Check " + os.getenv("WEBSITE_URL") + " to change your settings and add shares.", pUser_id=p_user_id)

    if len(shares) != 0:  # Send updates on watchlist shares if existing
        send_to_user("Your watchlist shares:", pUser_id=p_user_id)
        for element in shares:
            send_to_user(share_fetcher.get_share_information_markdown(element), pUser_id=p_user_id, md_mode=True)

    keywords = p_my_handler.get_user_keywords(p_user_id)  # get keywords as array

    if (keywords):  # if keywords exist and array is not empty
        send_to_user("If you haven't read yet: \nHere are some interesting news according to your keywords:", pUser_id=p_user_id)
        for keyword in keywords:
            news = news_fetcher.get_top_news_by_keyword(keyword)["articles"]
            keyword = hf.make_markdown_proof(keyword)

            if not news: # if empty news array
                send_to_user(f"No news found for keyword _{keyword}_\.", pUser_id=p_user_id, md_mode=True)
            
            elif news == None: # if news is none
                send_to_user(f"Server error for keyword _{keyword}_\.", pUser_id=p_user_id, md_mode=True)
            else:
                news_formatted = news_fetcher.format_article(news[0])  # format for message, only use the most popular article
                send_to_user(f"_keyword: {keyword}_\n\n{news_formatted}", pUser_id=p_user_id, md_mode=True)  # send news with related keyword in Markdown


def send_to_user(pText, pUser_id, md_mode=False):
    """ Send message to user
    :type pText: string
    :param pText: Text to send to user

    :type pUser_id: int
    :param pUser_id: user to send to. per default me (Florian Kellermann)

    :type md_mode: boolean
    :param md_mode: if true, parse_mode is markdown

    :raises: none

    :rtype: none
    """
    if md_mode:
        bot.send_message(chat_id=pUser_id, text=pText, parse_mode="MARKDOWNV2")
    else:
        bot.send_message(chat_id=pUser_id, text=pText)


if __name__ == "__main__":
    try:
        start_updater()
        sys.exit(-1)
    except KeyboardInterrupt:
        print("Ending")
        sys.exit(-1)