import sys
from pathlib import Path

from email_validator import validate_email
from flask_security import hash_password

from advlabdb import app, db, user_datastore
from advlabdb.independent_funs import randomPassword
from advlabdb.models import MAX_YEAR, MIN_YEAR, Admin, Semester

scripts_dir = Path(__file__).parent.absolute() / "scripts"

sys.path.insert(0, str(scripts_dir))

from shared import box


def validating_input(
    prompt,
    options=None,
    format_function=lambda ans: ans,
    check_constraints_function=lambda ans: True,
):
    if options is not None:
        prompt += " ["

        for opt in options[:-1]:
            prompt += opt + "/"

        prompt += options[-1] + "]: "

        lowered_options = [opt.lower() for opt in options]

        def adj_check_constraints_function(ans):
            return ans.lower() in lowered_options and check_constraints_function(ans)

    else:
        prompt += ": "
        adj_check_constraints_function = check_constraints_function

    ans = None
    first_run = True

    while ans is None or not adj_check_constraints_function(ans):
        if not first_run:
            print("Invalid input!")
        else:
            first_run = False

        ans = input(prompt)
        try:
            ans = format_function(ans)
        except Exception as ex:
            ans = None

    return ans


def confirm(prompt):
    ans = validating_input(
        prompt,
        options=("y", "n"),
        format_function=lambda ans: ans.lower(),
    )

    if ans == "y":
        return True
    else:
        return False


def main():
    print("This script should only be used to initialize the database after setting up a server")
    print("The old database will be DELETED and a new database will be created.")
    if not confirm("Are you sure that you want to continue?"):
        print("Aborted!")
        return

    with app.app_context():
        with db.session.begin():
            # Delete old database
            db.drop_all()
            # Create new database
            db.create_all()

            semester_label = validating_input(
                "Enter the label of the current semester",
                options=("SS", "WS"),
                format_function=lambda ans: ans.upper(),
            )

            semester_year = validating_input(
                f"Enter the year of the current semester (between {MIN_YEAR} and {MAX_YEAR})",
                format_function=lambda n_str: int(n_str),
                check_constraints_function=lambda n: MIN_YEAR <= n <= MAX_YEAR,
            )

            semester = Semester.customInit(label=semester_label, year=semester_year)

            db.session.add(semester)

            adminRole = user_datastore.create_role(name="admin")
            assistantRole = user_datastore.create_role(name="assistant")

            box("The first admin account will now be created")

            admin_email = validating_input(
                "Enter the admin's email address",
                format_function=lambda ans: validate_email(ans).email,
            )

            admin_first_name = input("Enter the admin's first name: ")
            admin_last_name = input("Enter the admin's last name: ")
            admin_phone_number = input("Enter the admin's phone number (optional): ")
            admin_mobile_phone_number = input("Enter the admin's mobile phone number (optional): ")
            admin_building = input("Enter the admin's building (optional): ")
            admin_room = input("Enter the admin's room (optional): ")

            admin_password = randomPassword()
            admin_hashed_password = hash_password(admin_password)

            admin_user = user_datastore.create_user(
                email=admin_email.strip(),
                password=admin_hashed_password,
                roles=[adminRole],
                first_name=admin_first_name.strip(),
                last_name=admin_last_name.strip(),
                phone_number=admin_phone_number.strip() or None,
                mobile_phone_number=admin_mobile_phone_number.strip() or None,
                building=admin_building.strip() or None,
                room=admin_room.strip() or None,
            )

            admin = Admin(user=admin_user)

            db.session.add(admin)

    box(admin_password, "Admin password")

    print("Done! Successfull database initialization.")


if __name__ == "__main__":
    main()