from flask import request, flash, render_template, redirect, url_for
from flask_login import current_user
from flask_wtf import FlaskForm
from wtforms import StringField, validators

from app import email_utils, config
from app.auth.base import auth_bp
from app.config import URL, DISABLE_REGISTRATION
from app.email_utils import can_be_used_as_personal_email
from app.extensions import db
from app.log import LOG
from app.models import User, ActivationCode
from app.utils import random_string, encode_url


class RegisterForm(FlaskForm):
    email = StringField("Email", validators=[validators.DataRequired()])
    password = StringField(
        "Password", validators=[validators.DataRequired(), validators.Length(min=8)]
    )


@auth_bp.route("/register", methods=["GET", "POST"])
def register():
    if current_user.is_authenticated:
        LOG.d("user is already authenticated, redirect to dashboard")
        flash("You are already logged in", "warning")
        return redirect(url_for("dashboard.index"))

    if config.DISABLE_REGISTRATION:
        flash("Registration is closed", "error")
        return redirect(url_for("auth.login"))

    form = RegisterForm(request.form)
    next_url = request.args.get("next")

    if form.validate_on_submit():
        email = form.email.data
        if not can_be_used_as_personal_email(email):
            flash(
                "You cannot use this email address as your personal inbox.", "error",
            )
        else:
            user = User.filter_by(email=email).first()

            if user:
                flash(f"Email {form.email.data} already exists", "warning")
            else:
                LOG.debug("create user %s", form.email.data)
                user = User.create(
                    email=form.email.data.lower(), name="", password=form.password.data,
                )
                db.session.commit()

                send_activation_email(user, next_url)

                return render_template("auth/register_waiting_activation.html")

    return render_template("auth/register.html", form=form, next_url=next_url)


def send_activation_email(user, next_url):
    # the activation code is valid for 1h
    activation = ActivationCode.create(user_id=user.id, code=random_string(30))
    db.session.commit()

    # Send user activation email
    activation_link = f"{URL}/auth/activate?code={activation.code}"
    if next_url:
        LOG.d("redirect user to %s after activation", next_url)
        activation_link = activation_link + "&next=" + encode_url(next_url)

    email_utils.send_activation_email(user.email, user.name, activation_link)