# -*- coding: UTF-8 -*
"""
auth.routes.py
"""

import flask
from flask import current_app, flash, g, render_template
from flask import redirect, url_for, request
from flask_login import login_user, current_user
from sqlalchemy import func

from app import db
from app.auth import bp, cas, logic
from app.auth.forms import (
    CASUsersImportConfigForm,
    LoginForm,
    ResetPasswordForm,
    ResetPasswordRequestForm,
    UserCreationForm,
)
from app.auth.models import Role, User, is_valid_user_name
from app.auth.email import send_password_reset_email
from app.decorators import admin_required
from app.forms.generic import SimpleConfirmationForm
from app.models.config import ScoDocSiteConfig
from app.models.departements import Departement
from app.scodoc.sco_roles_default import SCO_ROLES_DEFAULTS
from app.scodoc import sco_utils as scu

_ = lambda x: x  # sans babel
_l = _


def _login_form():
    """le formulaire de login, avec un lien CAS s'il est configuré."""
    form = LoginForm()
    if form.validate_on_submit():
        # note: ceci est la première requête SQL déclenchée par un utilisateur arrivant
        user = (
            User.query.filter_by(user_name=form.user_name.data).first()
            if is_valid_user_name(form.user_name.data)
            else None
        )

        if user is None or not user.check_password(form.password.data):
            current_app.logger.info("login: invalid (%s)", form.user_name.data)
            flash(_("Nom ou mot de passe invalide"))
            return redirect(url_for("auth.login"))

        login_user(user, remember=form.remember_me.data)

        current_app.logger.info("login: success (%s)", form.user_name.data)

        if user.passwd_must_be_changed:
            # Mot de passe à changer à la première connexion
            dept = user.dept or getattr(g, "scodoc_dept", None)
            if not dept:
                departement = db.session.query(Departement).first()
                dept = departement.acronym
            if dept:
                # Redirect to the password change page
                flash("Votre mot de passe doit être changé")
                return redirect(
                    url_for(
                        "users.form_change_password",
                        scodoc_dept=dept,
                        user_name=user.user_name,
                    )
                )

        return form.redirect("scodoc.index")

    return render_template(
        "auth/login.j2",
        title=_("Sign In"),
        form=form,
        is_cas_enabled=ScoDocSiteConfig.is_cas_enabled(),
        is_cas_forced=ScoDocSiteConfig.is_cas_forced(),
    )


@bp.route("/login", methods=["GET", "POST"])
def login():
    """ScoDoc Login form
    Si paramètre cas_force, redirige vers le CAS.
    """
    if current_user.is_authenticated:
        return redirect(url_for("scodoc.index"))

    if ScoDocSiteConfig.get("cas_force"):
        current_app.logger.info("login: forcing CAS")
        return redirect(url_for("cas.login"))

    return _login_form()


@bp.route("/login_scodoc", methods=["GET", "POST"])
def login_scodoc():
    """ScoDoc Login form.
    Formulaire login, sans redirection immédiate sur CAS si ce dernier est configuré.
    Sans CAS, ce formulaire est identique à /login
    """
    if current_user.is_authenticated:
        return redirect(url_for("scodoc.index"))
    return _login_form()


@bp.route("/logout")
def logout() -> flask.Response:
    "Logout a scodoc user. If CAS session, logout from CAS. Redirect."
    return logic.logout()


@bp.route("/create_user", methods=["GET", "POST"])
@admin_required
def create_user():
    "Form creating new user"
    form = UserCreationForm()
    if form.validate_on_submit():
        user = User(user_name=form.user_name.data, email=form.email.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash(f"Utilisateur {user.user_name} créé")
        return redirect(url_for("scodoc.index"))
    return render_template("auth/register.j2", title="Création utilisateur", form=form)


@bp.route("/reset_password_request", methods=["GET", "POST"])
def reset_password_request():
    """Form demande renvoi de mot de passe par mail
    Si l'utilisateur est déjà authentifié, le renvoie simplement sur
    la page d'accueil.
    """
    if current_user.is_authenticated:
        return redirect(url_for("scodoc.index"))
    form = ResetPasswordRequestForm()
    if form.validate_on_submit():
        users = User.query.filter(
            func.lower(User.email) == func.lower(form.email.data)
        ).all()
        if len(users) == 1:
            send_password_reset_email(users[0])
        elif len(users) > 1:
            current_app.logger.info(
                f"reset_password_request: multiple users with email '{form.email.data}' (ignoring)"
            )
        else:
            current_app.logger.info(
                f"reset_password_request: for unkown user '{form.email.data}'"
            )
        flash(
            _("Voir les instructions envoyées par mail (pensez à regarder vos spams)")
        )
        return redirect(url_for("auth.login"))
    return render_template(
        "auth/reset_password_request.j2",
        title=_("Reset Password"),
        form=form,
        is_cas_enabled=ScoDocSiteConfig.is_cas_enabled(),
    )


@bp.route("/reset_password/<token>", methods=["GET", "POST"])
def reset_password(token):
    "Reset password après demande par mail"
    if current_user.is_authenticated:
        return redirect(url_for("scodoc.index"))
    user: User = User.verify_reset_password_token(token)
    if user is None:
        return redirect(url_for("scodoc.index"))
    form = ResetPasswordForm()
    if form.validate_on_submit():
        user.set_password(form.password.data)
        db.session.commit()
        flash(_("Votre mot de passe a été changé."))
        return redirect(url_for("auth.login"))
    return render_template("auth/reset_password.j2", form=form, user=user)


@bp.route("/reset_standard_roles_permissions", methods=["GET", "POST"])
@admin_required
def reset_standard_roles_permissions():
    "Réinitialise (recrée au besoin) les rôles standards de ScoDoc et leurs permissions"
    form = SimpleConfirmationForm()
    if request.method == "POST" and form.cancel.data:
        return redirect(url_for("scodoc.configuration"))
    if form.validate_on_submit():
        Role.reset_standard_roles_permissions()
        flash("rôles standards réinitialisés !")
        return redirect(url_for("scodoc.configuration"))
    return render_template(
        "form_confirmation.j2",
        title="Réinitialiser les roles standards de ScoDoc ?",
        form=form,
        info_message=f"""<p>Les rôles standards seront recréés et leurs permissions
        réinitialisées aux valeurs par défaut de ScoDoc.
        </p>
        <p>
        Les rôles standards sont: <tt>{', '.join(SCO_ROLES_DEFAULTS.keys())}</tt>
        </p>
        """,
    )


@bp.route("/cas_users_generate_excel_sample")
@admin_required
def cas_users_generate_excel_sample():
    "une feuille excel pour importation config CAS"
    data = cas.cas_users_generate_excel_sample()
    return scu.send_file(data, "ImportConfigCAS", scu.XLSX_SUFFIX, scu.XLSX_MIMETYPE)


@bp.route("/cas_users_import_config", methods=["GET", "POST"])
@admin_required
def cas_users_import_config():
    """Import utilisateurs depuis feuille Excel"""
    form = CASUsersImportConfigForm()
    if form.validate_on_submit():
        if form.cancel.data:  # cancel button
            return redirect(url_for("scodoc.configuration"))
        datafile = request.files[form.user_config_file.name]
        nb_modif = cas.cas_users_import_excel_file(datafile)
        current_app.logger.info(f"cas_users_import_config: {nb_modif} comptes modifiés")
        flash(f"Config. CAS de {nb_modif} comptes modifiée.")
        return redirect(url_for("scodoc.configuration"))

    return render_template(
        "auth/cas_users_import_config.j2",
        title=_("Importation configuration CAS utilisateurs"),
        form=form,
    )