import json

from flask import (
    current_app,
    flash,
    redirect,
    render_template,
    request,
    session,
    url_for,
)
from itsdangerous import SignatureExpired

from app.main import main
from app.main.forms import NewPasswordForm
from app.models.user import User
from app.utils.login import log_in_user
from notifications_utils.url_safe_token import check_token


@main.route("/new-password/<path:token>", methods=["GET", "POST"])
def new_password(token):
    try:
        token_data = check_token(
            token,
            current_app.config["SECRET_KEY"],
            current_app.config["DANGEROUS_SALT"],
            current_app.config["EMAIL_EXPIRY_SECONDS"],
        )
    except SignatureExpired:
        flash(
            "The link in the email we sent you has expired. Enter your email address to resend."
        )
        return redirect(url_for(".forgot_password"))

    email_address = json.loads(token_data)["email"]
    user = User.from_email_address(email_address)
    if user.password_changed_more_recently_than(json.loads(token_data)["created_at"]):
        flash("The link in the email has already been used")
        return redirect(url_for("main.index"))

    if request.method == "GET":
        user.update_email_access_validated_at()

    form = NewPasswordForm()

    if form.validate_on_submit():
        user.reset_failed_login_count()
        session["user_details"] = {
            "id": user.id,
            "email": user.email_address,
            "password": form.new_password.data,
        }
        if user.email_auth:
            # they've just clicked an email link, so have done an email auth journey anyway. Just log them in.
            return log_in_user(user.id)
        else:
            # send user a 2fa sms code
            user.send_verify_code()
            return redirect(
                url_for("main.two_factor_sms", next=request.args.get("next"))
            )
    else:
        return render_template(
            "views/new-password.html", token=token, form=form, user=user
        )