import requests
from bs4 import BeautifulSoup
from MoodleCourse import MoodleCourse
import os
import pathvalidate
from urllib.parse import unquote


def get_moodle_auth_cookie(s: requests.Session, url: str) -> requests.Session:
    s.get(f"{url}login/index.php")
    s.post(f"https://tequila.epfl.ch/cgi-bin/tequila/login", data={
        "requestkey": s.cookies["TequilaPHP"],
        "username": args.username,
        "password": args.password
    })
    return s


def get_courses(s: requests.Session, url: str) -> list[MoodleCourse]:
    r = s.get(f"{url}user/profile.php?showallcourses=1")
    soup = BeautifulSoup(r.text, 'html.parser')
    course_node = soup.find_all("section", {"class": "node_category card d-inline-block w-100 mb-3"})[1]
    course_list = course_node.find_all("a")
    course_names = list(map(lambda x: x.text.strip(), course_list))
    course_list = list(map(lambda x: x["href"], course_list))
    course_urls = list(map(lambda x: f"{url}course/view.php?id={x.split('&')[-2].split('=')[1]}", course_list))
    return list(map(lambda x: MoodleCourse(x[0], x[1]), zip(course_names, course_urls)))


def download_resource(s, activity):
    directory = os.path.join(activity.parent_dir, activity.name)
    directory = pathvalidate.sanitize_filepath(directory)
    file = os.path.join(directory, unquote(activity.url.split('/')[-1]))
    file = pathvalidate.sanitize_filepath(file)
    if args.ignore_extension is not None and str(file).split(".")[-1] in args.ignore_extension:
        return True
    if os.path.exists(os.path.join(file)):
        return True
    if not os.path.exists(directory):
        os.makedirs(directory)
    try:
        with s.get(activity.url, stream=True) as r:
            with open(file+".part", 'wb') as f:
                for chunk in r.iter_content(chunk_size=8192):
                    f.write(chunk)
        os.rename(file+".part", file)
        if os.path.exists(file + ".part"):
            os.remove(file + ".part")
    except:
        if os.path.exists(file+".part"):
            os.remove(file+".part")
        return False
    finally:
        return True


def download_folder(s, activity):
    directory = os.path.join(activity.parent_dir, activity.name)
    directory = pathvalidate.sanitize_filepath(directory)
    try:
        with s.get(activity.url, stream=True) as r:
            file = os.path.join(directory, unquote(r.headers['Content-Disposition'].split('\'')[-1]))
            file = pathvalidate.sanitize_filepath(file)
            if os.path.exists(os.path.join(file)):
                return True
            if not os.path.exists(directory):
                os.makedirs(directory)
            with open(file + ".part", 'wb') as f:
                for chunk in r.iter_content(chunk_size=8192):
                    f.write(chunk)
            os.rename(file + ".part", file)
            if os.path.exists(file + ".part"):
                os.remove(file + ".part")
    except:
        if os.path.exists(file+".part"):
            os.remove(file+".part")
        return False
    finally:
        return True


def download_assign(s, activity):
    r = s.get(activity.url)
    soup = BeautifulSoup(r.text, 'html.parser')
    for candidate in soup.find_all("div", {"class": "fileuploadsubmission"}):
        link = candidate.find("a")
        url = link["href"].split('?')[0]
        with s.get(url, stream=True) as r:
            directory = os.path.join(activity.parent_dir, activity.name)
            directory = pathvalidate.sanitize_filepath(directory)
            file = os.path.join(directory, unquote(link.text))
            file = pathvalidate.sanitize_filepath(file)
            if not os.path.exists(directory):
                os.makedirs(directory)
            if os.path.exists(os.path.join(file)):
                return True
            with open(file + ".part", 'wb') as f:
                for chunk in r.iter_content(chunk_size=8192):
                    f.write(chunk)
            os.rename(file + ".part", file)
            if os.path.exists(file + ".part"):
                os.remove(file + ".part")
    return True



def download_year(target_url: str):
    s = requests.Session()
    s = get_moodle_auth_cookie(s, target_url)
    courses = get_courses(s, target_url)
    for course in courses:
        course.init(s)
        print(target_url, course.name)
        course.set_parent_dir(args.storage_dir, args.academic_year)
        for section in course.sections:
            for activity in section.activities:
                if activity.type == "resource":
                    if activity.find_file(s):
                        if not download_resource(s, activity):
                            print("Could not download: ", activity.url)
                    else:
                        print("Could not find: ", activity.url)
                elif activity.type == "folder":
                    if activity.find_folder(s):
                        if not download_folder(s, activity):
                            print("Could not download: ", activity.url)
                    else:
                        print("Could not find: ", activity.url)
                elif activity.type == "assign":
                    download_assign(s, activity)


if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(description='Moodle to download')
    parser.add_argument('--username', '-u')
    parser.add_argument('--password', '-p')
    parser.add_argument('--moodle_url', '--url', '-m', default='https://moodle.epfl.ch/')
    parser.add_argument('--academic_year', '--year', '-y', default=None)
    parser.add_argument('--storage_dir', '--dir', '-d', default='.')
    parser.add_argument('--ignore_extension', '-i', nargs='*')
    global args
    args = parser.parse_args()
    download_year(args.moodle_url)