"""
Check the Amazon PS5 Stock using a simple GET Request.
"""

__author__ = "Lukas Mahler"
__version__ = "0.1.0"
__date__ = "13.08.2021"
__email__ = "m@hler.eu"
__status__ = "Development"

# Imports
import os
import sys
import random
import dotenv
import logging
import requests
import traceback
from time import sleep
from bs4 import BeautifulSoup
from datetime import datetime
from logging.handlers import TimedRotatingFileHandler

# Constants
DEBUG = False
CRON = False
TEST = True
URL = 'https://www.amazon.de/Sony-Interactive-Entertainment-PlayStation-5/dp/B08H93ZRK9'


def getStock():

    headers = {
        'DNT': '1',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36'
    }

    with requests.Session() as s:

        s.headers = headers
        s.trust_env = False

        site = s.get(URL)
        if site.status_code != 200:
            print(f"Fehler: HTTP-Statuscode {site.status_code} <> 200")
            exit()
        soup = BeautifulSoup(site.content, 'lxml')
        span = soup.find("span", class_="a-size-medium a-color-price").text
        avail = span.strip()

        if DEBUG:
            print(f"DEBUG: avail = [{avail}]")

    if avail == "Derzeit nicht verfügbar.":
        status = 'Out of Stock'
    else:
        status = 'In Stock'

    return status


def reportError(etype, evalue, tbobj):

    # Hacky find the last error line number
    lasttb = traceback.format_tb(tbobj)[-1]
    start = lasttb.find('line ')
    end = lasttb.find(', in', start)
    lastlno = lasttb[start:end]

    # tb = ''.join(traceback.format_exception(etype, evalue, tbobj))
    txt = str(lastlno) + " - " + str(etype) + " - " + str(evalue)
    mylog.error(txt)
    # mylog.error(tb)


def initLogger():
    global mylog
    # now = date.today().strftime("%Y-%m-%d")
    mylog = logging.getLogger()
    mylog.setLevel(logging.INFO)
    # handler = logging.FileHandler(f'ps5amazon_{now}_v{__version__}.log', 'a', 'utf-8')
    fname = f'ps5amazon_v{__version__}.log'
    handler = TimedRotatingFileHandler(filename=fname, when='D', interval=1, backupCount=14, encoding='utf-8', delay=False)
    formatter = logging.Formatter('%(asctime)s - %(levelname)7s - %(message)s')
    handler.setFormatter(formatter)
    mylog.addHandler(handler)


def main():
    # error handling
    sys.excepthook = reportError
    initLogger()

    dotenv_file = dotenv.find_dotenv()
    if not dotenv_file:
        # either
        open(".env", 'x').close()
        dotenv_file = dotenv.find_dotenv()
        # or
        # raise FileNotFoundError("could not locate .env file")
    dotenv.load_dotenv(dotenv_file)
    dotend_keys = dotenv.dotenv_values()
    if not {"STOCKSTATUS"} <= dotend_keys.keys():
        # either
        dotenv.set_key(dotenv_file, "STOCKSTATUS", "")
        # or
        # raise ValueError("missing key in your .env file.")

    """
    Given the script  executes as Cronjob add a random sleep timer.
    This will make our Request appear less botty
    """
    if CRON:
        sleep(random.randint(1, 30))

    stock_status = getStock()

    if stock_status != os.getenv("STOCKSTATUS"):

        if TEST:
            now = datetime.now().strftime("%Y-%m-%d-%H.%M") + "-" + stock_status
            open(now, 'x').close()

        dotenv.set_key(dotenv_file, "STOCKSTATUS", stock_status)
    else:
        pass


if __name__ == "__main__":
    main()