import requests, time, re, os, configparser, sys, argparse, shutil
from bs4 import BeautifulSoup

def main(args: dict) -> None:
  print(f"Fetching PDFs.")
  if not os.path.isdir("pdfs"):
    print("Setting up PDFs directory.")
    os.mkdir("pdfs")
  if args.save_pages and not os.path.isdir("html"):
    print("Setting up HTML directory.")
    os.mkdir("html")
    
  config = configparser.ConfigParser(interpolation=None)
  if not os.path.isfile('config.ini'):
    print("config.ini is missing!")
    sys.exit(0)
  config.read('config.ini')

  if "username" not in config["DEFAULT"] or "password" not in config["DEFAULT"] or config["DEFAULT"]["username"] == "" or config["DEFAULT"]["password"] == "":
    print("username and password must be present in config.ini.")
    sys.exit(0)

  INFOVAYA_ROOT = "https://events.infovaya.com/"

  info = { "username": config["DEFAULT"]["username"],
          "password": config["DEFAULT"]["password"],
          "action": "login"
          }

  infovaya_session = requests.Session()
  infovaya_creds_request = infovaya_session.post(f"{INFOVAYA_ROOT}login", data=info)
  infovaya_creds_request.raise_for_status()

  sessions_request = infovaya_session.get("{}event?id=88&actionMenu=sessions".format(INFOVAYA_ROOT))
  sessions_request.raise_for_status()
  sessions_page_soup = BeautifulSoup(sessions_request.text, "html.parser")
  if args.save_pages:
    with open("html/main.html", "w+", encoding="utf-8") as file:
      file.write(sessions_page_soup.prettify())
  print("Starting to search for PDFs. This may take a while...")
  for session_link in sessions_page_soup.find_all("a", href=re.compile("session\?id")):
    session_href = session_link["href"][1:]
    page_name = f"session_{session_href.split('=')[-1]}.html"
    if not os.path.isfile(f"html/{page_name}"):
      time.sleep(1)
      print(f"Fetching {session_href} ... ", end="")
      page_request = infovaya_session.get(f"{INFOVAYA_ROOT}{session_href}")
      page_request.raise_for_status()
      print("Success! Finding presentations... ", end="")
      page_soup = BeautifulSoup(page_request.text, "html.parser")
      if args.save_pages:
        with open(f"html/{page_name}", "w+", encoding="utf-8") as file:
          file.write(page_soup.prettify())
        print(f"Wrote to file html/{page_name}.")
      else:
        print()
        # import pdb; pdb.set_trace()
      for presentation_link in page_soup.find_all("a", href=re.compile("presentation\?id")):
        presentation_href = presentation_link["href"][1:]
        pres_page_name = f"pres_{presentation_href.split('=')[-1]}.html"
        if not os.path.isfile(f"html/{pres_page_name}"):
          print(f"  Fetching {presentation_href} ...", end="")
          pres_request = infovaya_session.get(f"{INFOVAYA_ROOT}{presentation_href}")
          pres_request.raise_for_status()
          print("Success! ", end="")
          pres_page_soup = BeautifulSoup(pres_request.text, "html.parser")
          if args.save_pages:
            with open(f"html/{pres_page_name}", "w+", encoding="utf-8") as file:
              file.write(pres_page_soup.prettify())
          pres_page_title = pres_page_soup.h1.string
          print(f"Found '{pres_page_title}'. Finding PDF...")
          for pdf_tag in pres_page_soup.find_all("a", href=re.compile("pdfviewer")):
            pdf_name = pdf_tag["href"].split("/")[-1]
            file_name = f"{pres_page_title.replace(' ', '_')}-{pdf_name}"
            pdf_request = infovaya_session.get(f"{INFOVAYA_ROOT}{pdf_tag['href'][1:]}")
            pdf_request.raise_for_status()
            print(f"Fetching PDF for '{pres_page_title}'...")
            with open(f"pdfs/{file_name}", "wb") as file:
              file.write(pdf_request.content)
              print(f"Saved as pdfs/{file_name}")
          time.sleep(2)
  

if __name__ == "__main__":
  parser = argparse.ArgumentParser()
  parser.add_argument("-s", "--save-pages", action="store_true", help="Save HTML of ")
  # parser.add_argument("-i", "--images", action="store_true", help="Set this flag to download images as well as HTML.\nNOTE: This may be VERY bandwidth and disk intensive!")
  args = parser.parse_args()
  print(args)
  main(args)