# -*- mode: python -*-
# -*- coding: utf-8 -*-

##############################################################################
#
# ScoDoc
#
# Copyright (c) 1999 - 2023 Emmanuel Viennet.  All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#   Emmanuel Viennet      emmanuel.viennet@viennet.net
#
##############################################################################

"""
Module main: page d'accueil, avec liste des départements

Emmanuel Viennet, 2021
"""
import datetime
import io
import re

import flask
from flask import (
    abort,
    flash,
    make_response,
    redirect,
    render_template,
    send_file,
    url_for,
)
from flask import request
import flask_login
from flask_login.utils import login_required, current_user
from PIL import Image as PILImage

from werkzeug.exceptions import BadRequest, NotFound


from app import db, log
from app.auth.models import User, Role
from app.auth.cas import set_cas_configuration
from app.decorators import (
    admin_required,
    scodoc7func,
    scodoc,
)
from app.forms.generic import SimpleConfirmationForm
from app.forms.main import config_logos, config_main
from app.forms.main.config_assiduites import ConfigAssiduitesForm
from app.forms.main.config_apo import CodesDecisionsForm
from app.forms.main.config_cas import ConfigCASForm
from app.forms.main.config_personalized_links import PersonalizedLinksForm
from app.forms.main.create_dept import CreateDeptForm
from app.forms.main.role_create import CreateRoleForm

from app import models
from app.models import (
    Departement,
    FormSemestre,
    FormSemestreInscription,
    Identite,
    ScoDocSiteConfig,
    UniteEns,
)
from app.models import departements
from app.models.config import PersonalizedLink

from app.scodoc import sco_edt_cal
from app.scodoc import sco_find_etud
from app.scodoc import sco_logos
from app.scodoc import sco_utils as scu

from app.scodoc.sco_exceptions import AccessDenied, ScoValueError
from app.scodoc.sco_permissions import Permission
from app.scodoc.sco_roles_default import SCO_ROLES_DEFAULTS
from app.views import scodoc_bp as bp
import sco_version


@bp.route("/")
@bp.route("/ScoDoc")
@bp.route("/ScoDoc/index")
def index():
    "Page d'accueil: liste des départements"
    depts = Departement.query.filter_by().order_by(Departement.acronym).all()
    return render_template(
        "scodoc.j2",
        title=sco_version.SCONAME,
        current_app=flask.current_app,
        depts=depts,
        Permission=Permission,
        scu=scu,
    )


# Renvoie les url /ScoDoc/RT/ vers /ScoDoc/RT/Scolarite
@bp.route("/ScoDoc/<scodoc_dept>/")
def index_dept(scodoc_dept):
    return redirect(url_for("scolar.index_html", scodoc_dept=scodoc_dept))


@bp.route("/ScoDoc/create_dept", methods=["GET", "POST"])
@admin_required
def create_dept():
    """Form création département"""
    form = CreateDeptForm()
    if request.method == "POST" and form.cancel.data:  # cancel button
        return redirect(url_for("scodoc.index"))
    if form.validate_on_submit():
        departements.create_dept(
            form.acronym.data,
            visible=form.visible.data,
            # description=form.description.data,
        )
        flash(f"Département {form.acronym.data} créé.")
        return redirect(url_for("scodoc.index"))
    return render_template(
        "create_dept.j2",
        form=form,
        title="Création d'un nouveau département",
    )


@bp.route("/ScoDoc/toggle_dept_vis/<int:dept_id>", methods=["GET", "POST"])
@admin_required
def toggle_dept_vis(dept_id):
    """Cache ou rend visible un dept"""
    dept = Departement.query.get_or_404(dept_id)
    dept.visible = not dept.visible
    db.session.add(dept)
    db.session.commit()
    return redirect(url_for("scodoc.index"))


@bp.route("/ScoDoc/config_roles", methods=["GET", "POST"])
@admin_required
def config_roles():
    """Form associations rôles / permissions"""
    permissions_names = sorted(Permission.permission_by_value.values())
    roles = Role.query.order_by(Role.name).all()
    return render_template(
        "scodoc/role_editor.j2",
        Permission=Permission,
        permissions_names=permissions_names,
        roles=roles,
        SCO_ROLES_DEFAULTS=SCO_ROLES_DEFAULTS,
    )


@bp.route("/ScoDoc/permission_info/<string:perm_name>")
@admin_required
def permission_info(perm_name: str):
    """Infos sur une permission"""
    permission = Permission.get_by_name(perm_name)
    if permission is None:
        raise ScoValueError("permission_info: permission inconnue")
    return render_template(
        "scodoc/permission_info.j2",
        permission=permission,
        permission_name=perm_name,
        Permission=Permission,
    )


@bp.route("/ScoDoc/role_info/<string:role_name>")
@admin_required
def role_info(role_name: str):
    """Infos sur un rôle"""
    role = Role.query.filter_by(name=role_name).first_or_404()
    return render_template(
        "scodoc/role_info.j2", role=role, SCO_ROLES_DEFAULTS=SCO_ROLES_DEFAULTS
    )


@bp.route("/ScoDoc/role_create", methods=["GET", "POST"])
@admin_required
def role_create():
    """Création d'un nouveau rôle"""
    form = CreateRoleForm()
    dest_url = url_for("scodoc.config_roles")
    if request.method == "POST" and form.cancel.data:
        return redirect(dest_url)
    if form.validate_on_submit():
        role_name = form.name.data.strip()
        role: Role = Role.query.filter_by(name=role_name).first()
        if role:
            raise ScoValueError("Un rôle du même nom existe déjà", dest_url=dest_url)
        role = Role(name=role_name)
        db.session.add(role)
        db.session.commit()
        flash(f"Rôle {role_name} créé")
        return redirect(dest_url)

    roles = Role.query.order_by(Role.name).all()
    return render_template(
        "scodoc/role_create.j2", form=form, roles_names=[role.name for role in roles]
    )


@bp.route("/ScoDoc/role_delete/<string:role_name>", methods=["GET", "POST"])
@admin_required
def role_delete(role_name: str):
    """Suppression d'un rôle"""

    role = Role.query.filter_by(name=role_name).first_or_404()
    # Ne permet de supprimer les rôles standards (on peut le faire via la ligne de commande ou l'API)
    if role.name in SCO_ROLES_DEFAULTS:
        raise ScoValueError(
            f"Le rôle {role_name} est standard et ne peux pas être supprimé ici."
        )
    form = SimpleConfirmationForm()
    if request.method == "POST" and form.cancel.data:
        return redirect(url_for("scodoc.config_roles"))
    if form.validate_on_submit():
        db.session.delete(role)
        db.session.commit()
        flash(f"Rôle {role_name} supprimé")
        return redirect(url_for("scodoc.config_roles"))
    return render_template(
        "form_confirmation.j2",
        title=f"Supprimer le rôle {role_name} ?",
        form=form,
        info_message="""<p>Cette suppression est irréversible.</p>""",
    )


@bp.route("/ScoDoc/config_cas", methods=["GET", "POST"])
@admin_required
def config_cas():
    """Form config CAS"""
    form = ConfigCASForm()
    if request.method == "POST" and form.cancel.data:  # cancel button
        return redirect(url_for("scodoc.index"))
    if form.validate_on_submit():
        if ScoDocSiteConfig.set("cas_enable", form.data["cas_enable"]):
            flash("CAS " + ("activé" if form.data["cas_enable"] else "désactivé"))
        if ScoDocSiteConfig.set("cas_force", form.data["cas_force"]):
            flash("CAS " + ("forcé" if form.data["cas_force"] else "non forcé"))
        if ScoDocSiteConfig.set(
            "cas_allow_for_new_users", form.data["cas_allow_for_new_users"]
        ):
            flash(
                f"""CAS {'' if form.data['cas_allow_for_new_users'] else 'non'
                       } autorisé par défaut aux nouveaux"""
            )
        if ScoDocSiteConfig.set("cas_server", form.data["cas_server"]):
            flash("URL du serveur CAS enregistrée")
        if ScoDocSiteConfig.set("cas_login_route", form.data["cas_login_route"]):
            flash("Route du login CAS enregistrée")
        if ScoDocSiteConfig.set("cas_logout_route", form.data["cas_logout_route"]):
            flash("Route du logout CAS enregistrée")
        if ScoDocSiteConfig.set("cas_validate_route", form.data["cas_validate_route"]):
            flash("Route de validation CAS enregistrée")
        if ScoDocSiteConfig.set("cas_attribute_id", form.data["cas_attribute_id"]):
            flash("Attribut CAS ID enregistré")
        if ScoDocSiteConfig.set(
            "cas_uid_from_mail_regexp", form.data["cas_uid_from_mail_regexp"]
        ):
            flash("Expression extraction identifiant CAS enregistrée")
        if ScoDocSiteConfig.set(
            "cas_edt_id_from_xml_regexp", form.data["cas_edt_id_from_xml_regexp"]
        ):
            flash("Expression extraction identifiant edt enregistrée")
        if ScoDocSiteConfig.set("cas_ssl_verify", form.data["cas_ssl_verify"]):
            flash("Vérification SSL modifiée")
        if form.cas_ssl_certificate_file.data:
            data = request.files[form.cas_ssl_certificate_file.name].read()
            try:
                data_str = data.decode("ascii")
            except UnicodeDecodeError as exc:
                raise ScoValueError("Fichier certificat invalide (non ASCII)") from exc
            if ScoDocSiteConfig.set("cas_ssl_certificate", data_str):
                flash("Certificat SSL enregistré")
        set_cas_configuration()
        return redirect(url_for("scodoc.configuration"))

    elif request.method == "GET":
        form.cas_enable.data = ScoDocSiteConfig.get("cas_enable")
        form.cas_force.data = ScoDocSiteConfig.get("cas_force")
        form.cas_allow_for_new_users.data = ScoDocSiteConfig.get(
            "cas_allow_for_new_users"
        )
        form.cas_server.data = ScoDocSiteConfig.get("cas_server")
        form.cas_login_route.data = ScoDocSiteConfig.get("cas_login_route")
        form.cas_logout_route.data = ScoDocSiteConfig.get("cas_logout_route")
        form.cas_validate_route.data = ScoDocSiteConfig.get("cas_validate_route")
        form.cas_attribute_id.data = ScoDocSiteConfig.get("cas_attribute_id")
        form.cas_uid_from_mail_regexp.data = ScoDocSiteConfig.get(
            "cas_uid_from_mail_regexp"
        )
        form.cas_edt_id_from_xml_regexp.data = ScoDocSiteConfig.get(
            "cas_edt_id_from_xml_regexp"
        )
        form.cas_ssl_verify.data = ScoDocSiteConfig.get("cas_ssl_verify")
    return render_template(
        "config_cas.j2",
        form=form,
        title="Configuration du Service d'Authentification Central (CAS)",
        cas_ssl_certificate_loaded=ScoDocSiteConfig.get("cas_ssl_certificate"),
    )


@bp.route("/ScoDoc/config_assiduites", methods=["GET", "POST"])
@admin_required
def config_assiduites():
    """Form config Assiduites"""
    form = ConfigAssiduitesForm()
    if request.method == "POST" and form.cancel.data:  # cancel button
        return redirect(url_for("scodoc.index"))

    edt_options = (
        ("edt_ics_path", "Chemin vers les calendriers ics"),
        ("edt_ics_title_field", "Champ contenant titre"),
        ("edt_ics_title_regexp", "Expression extraction titre"),
        ("edt_ics_group_field", "Champ contenant groupe"),
        ("edt_ics_group_regexp", "Expression extraction groupe"),
        ("edt_ics_mod_field", "Champ contenant module"),
        ("edt_ics_mod_regexp", "Expression extraction module"),
        ("edt_ics_uid_field", "Champ contenant l'enseignant"),
        ("edt_ics_uid_regexp", "Expression extraction de l'enseignant"),
    )

    if form.validate_on_submit():
        if ScoDocSiteConfig.set("assi_morning_time", form.data["morning_time"]):
            flash("Heure du début de la journée enregistrée")
        if ScoDocSiteConfig.set("assi_lunch_time", form.data["lunch_time"]):
            flash("Heure de midi enregistrée")
        if ScoDocSiteConfig.set("assi_afternoon_time", form.data["afternoon_time"]):
            flash("Heure de fin de la journée enregistrée")
        if ScoDocSiteConfig.set("assi_tick_time", float(form.data["tick_time"])):
            flash("Granularité de la timeline enregistrée")
        # --- Calendriers emploi du temps
        for opt_name, message in edt_options:
            if ScoDocSiteConfig.set(opt_name, form.data[opt_name]):
                flash(f"{message} enregistré")

        return redirect(url_for("scodoc.configuration"))

    if request.method == "GET":
        form.morning_time.data = ScoDocSiteConfig.get(
            "assi_morning_time", datetime.time(8, 0, 0)
        )
        form.lunch_time.data = ScoDocSiteConfig.get(
            "assi_lunch_time", datetime.time(13, 0, 0)
        )
        form.afternoon_time.data = ScoDocSiteConfig.get(
            "assi_afternoon_time", datetime.time(18, 0, 0)
        )
        try:
            form.tick_time.data = float(ScoDocSiteConfig.get("assi_tick_time", 15.0))
        except ValueError:
            form.tick_time.data = 15.0
            ScoDocSiteConfig.set("assi_tick_time", 15.0)
        # --- Emplois du temps
        for opt_name, _ in edt_options:
            getattr(form, opt_name).data = ScoDocSiteConfig.get(opt_name)

    return render_template(
        "assiduites/pages/config_assiduites.j2",
        form=form,
        title="Configuration du module Assiduité",
    )


@bp.route("/ScoDoc/ics_raw_sample/<string:edt_id>")
@admin_required
def ics_raw_sample(edt_id: str):
    "Renvoie un extrait de l'ics brut, pour aider à configurer les extractions"
    log(f"ics_raw_sample/{edt_id}")
    try:
        raw_ics, _ = sco_edt_cal.formsemestre_load_calendar(edt_id=edt_id)
    except ScoValueError as exc:
        log(f"ics_raw_sample: formsemestre_load_calendar({edt_id}) failed")
        return exc.args[0]
    try:
        ics = raw_ics.decode(scu.SCO_ENCODING)
    except SyntaxError:
        log("ics_raw_sample: raw_ics.decode failed")
        return f"Erreur lors de la conversion vers {scu.SCO_ENCODING}"
    evs = ics.split("BEGIN:VEVENT")
    if len(evs) < 1:
        log("ics_raw_sample: empty calendar")
        return "pas d'évènements VEVENT détectés dans ce fichier"
    return "BEGIN:VEVENT" + evs[len(evs) // 2]


@bp.route("/ScoDoc/config_codes_decisions", methods=["GET", "POST"])
@admin_required
def config_codes_decisions():
    """Form config codes decisions"""
    form = CodesDecisionsForm()
    if request.method == "POST" and form.cancel.data:  # cancel button
        return redirect(url_for("scodoc.index"))
    if form.validate_on_submit():
        for code in models.config.CODES_SCODOC_TO_APO:
            ScoDocSiteConfig.set_code_apo(code, getattr(form, code).data)
        flash("Codes décisions enregistrés")
        return redirect(url_for("scodoc.index"))
    elif request.method == "GET":
        for code in models.config.CODES_SCODOC_TO_APO:
            getattr(form, code).data = ScoDocSiteConfig.get_code_apo(code)

    return render_template(
        "config_codes_decisions.j2",
        form=form,
        title="Configuration des codes de décisions",
    )


@bp.route("/ScoDoc/config_personalized_links", methods=["GET", "POST"])
@admin_required
def config_personalized_links():
    """Form config liens perso"""
    form = PersonalizedLinksForm()
    if request.method == "POST" and form.cancel.data:  # cancel button
        return redirect(url_for("scodoc.index"))
    if form.validate_on_submit():
        links = []
        for idx in list(form.links_by_id) + ["new"]:
            title = form.data.get(f"link_{idx}")
            url = form.data.get(f"link_url_{idx}")
            with_args = form.data.get(f"link_with_args_{idx}")
            if title and url:
                links.append(
                    PersonalizedLink(title=title, url=url, with_args=with_args)
                )
        ScoDocSiteConfig.set_perso_links(links)
        flash("Liens enregistrés")
        return redirect(url_for("scodoc.configuration"))

    for idx, link in form.links_by_id.items():
        getattr(form, f"link_{idx}").data = link.title
        getattr(form, f"link_url_{idx}").data = link.url
        getattr(form, f"link_with_args_{idx}").data = link.with_args
    return render_template(
        "config_personalized_links.j2",
        form=form,
        title="Configuration des liens personnalisés",
    )


@bp.route("/ScoDoc/table_etud_in_accessible_depts", methods=["POST"])
@login_required
def table_etud_in_accessible_depts():
    """recherche étudiants sur plusieurs départements"""
    return sco_find_etud.table_etud_in_accessible_depts(expnom=request.form["expnom"])


# Fonction d'API accessible sans aucun authentification
@bp.route("/ScoDoc/get_etud_dept")
def get_etud_dept():
    """Returns the dept acronym (eg "GEII") of an etud (identified by etudid,
    code_nip ou code_ine in the request).
    Ancienne API: ramène la chaine brute, texte sans JSON ou XML.
    """
    if "etudid" in request.args:
        # zero ou une réponse:
        etuds = [Identite.get_etud(request.args["etudid"])]
    elif "code_nip" in request.args:
        # il peut y avoir plusieurs réponses si l'étudiant est passé par plusieurs départements
        etuds = Identite.query.filter_by(code_nip=request.args["code_nip"]).all()
    elif "code_ine" in request.args:
        etuds = Identite.query.filter_by(code_ine=request.args["code_ine"]).all()
    else:
        raise BadRequest(
            "missing argument (expected one among: etudid, code_nip or code_ine)"
        )
    if not etuds:
        raise NotFound("student not found")
    elif len(etuds) == 1:
        last_etud = etuds[0]
    else:
        # inscriptions dans plusieurs departements: cherche la plus recente
        last_etud = None
        last_date = None
        for etud in etuds:
            inscriptions = FormSemestreInscription.query.filter_by(etudid=etud.id).all()
            for ins in inscriptions:
                date_fin = db.session.get(FormSemestre, ins.formsemestre_id).date_fin
                if (last_date is None) or date_fin > last_date:
                    last_date = date_fin
                    last_etud = etud
        if not last_etud:
            # est présent dans plusieurs semestres mais inscrit dans aucun !
            # le choix a peu d'importance...
            last_etud = etuds[-1]

    return Departement.query.get_or_404(last_etud.dept_id).acronym


# Bricolage pour le portail IUTV avec ScoDoc 7: (DEPRECATED: NE PAS UTILISER !)
@bp.route(
    "/ScoDoc/search_inscr_etud_by_nip", methods=["GET"]
)  # pour compat anciens clients PHP
@scodoc
@scodoc7func
def search_inscr_etud_by_nip(code_nip, fmt="json", __ac_name="", __ac_password=""):
    auth_ok = False
    user_name = __ac_name
    user_password = __ac_password
    if user_name and user_password:
        u = User.query.filter_by(user_name=user_name).first()
        if u and u.check_password(user_password):
            auth_ok = True
            flask_login.login_user(u)
    if not auth_ok:
        abort(403)
    else:
        return sco_find_etud.search_inscr_etud_by_nip(code_nip=code_nip, fmt=fmt)


@bp.route("/ScoDoc/about")
@bp.route("/ScoDoc/Scolarite/<scodoc_dept>/about")
@login_required
def about(scodoc_dept=None):
    "version info"
    return render_template(
        "about.j2",
        version=scu.get_scodoc_version(),
        news=sco_version.SCONEWS,
        logo=scu.icontag("borgne_img"),
    )


# ---- CONFIGURATION

# Notes pour variables config: (valeurs par défaut des paramètres de département)
# Chaines simples
# SCOLAR_FONT = "Helvetica"
# SCOLAR_FONT_SIZE = 10
# SCOLAR_FONT_SIZE_FOOT = 6
# INSTITUTION_NAME = "<b>Institut Universitaire de Technologie - Université Georges Perec</b>"
# INSTITUTION_ADDRESS = "Web <b>www.sor.bonne.top</b> - 11, rue Simon Crubelier  - 75017 Paris"
# INSTITUTION_CITY = "Paris"
# Textareas:
# DEFAULT_PDF_FOOTER_TEMPLATE = "Edité par %(scodoc_name)s le %(day)s/%(month)s/%(year)s à %(hour)sh%(minute)s"

# Booléens
# always_require_ine

# Logos:
# LOGO_FOOTER*, LOGO_HEADER*


@bp.route("/ScoDoc/configuration", methods=["GET", "POST"])
@admin_required
def configuration():
    "Page de configuration globale"
    if not current_user.is_administrator():
        raise AccessDenied("invalid user (%s) must be SuperAdmin" % current_user)
    return config_main.configuration()


@bp.route("/ScoDoc/get_bonus_description/<bonus_name>", methods=["GET"])
def get_bonus_description(bonus_name: str):
    "description text/html du bonus"
    if bonus_name == "default":
        bonus_name = ""
    bonus_class = ScoDocSiteConfig.get_bonus_sport_class_from_name(bonus_name)
    text = bonus_class.__doc__
    if text:
        fields = re.split(r"\n\n", text, maxsplit=1)
        if len(fields) > 1:
            first_line, text = fields
        else:
            first_line, text = "", fields[0]
    else:
        text = ""
        first_line = "pas de fonction bonus configurée."

    return f"""<div class="bonus_description_head">{first_line}</div>
    <div>{text}</div>
    """


@bp.route("/ScoDoc/configure_logos", methods=["GET", "POST"])
@admin_required
def configure_logos():
    "Page de configuration des logos (globale)"
    if not current_user.is_administrator():
        raise AccessDenied("invalid user (%s) must be SuperAdmin" % current_user)
    return config_logos.config_logos()


SMALL_SIZE = (200, 200)


def _return_logo(name="header", dept_id="", small=False, strict: bool = True):
    # stockée dans /opt/scodoc-data/config/logos donc servie manuellement ici
    # from app.scodoc.sco_photos import _http_jpeg_file

    logo = sco_logos.find_logo(name, dept_id, strict)
    if logo is not None:
        logo.select()
        suffix = logo.suffix
        if small:
            with PILImage.open(logo.filepath) as im:
                # on garde le même format (on pourrait plus simplement générer systématiquement du JPEG)
                fmt = {  # adapt suffix to be compliant with PIL save format
                    "PNG": "PNG",
                    "JPG": "JPEG",
                    "JPEG": "JPEG",
                }[suffix.upper()]
                if fmt == "JPEG":
                    im = im.convert("RGB")
                im.thumbnail(SMALL_SIZE)
                stream = io.BytesIO()
                im.save(stream, fmt)
                stream.seek(0)
                return send_file(stream, mimetype=f"image/{fmt}")
        else:
            # return _http_jpeg_file(logo.filepath)
            #  ... replaces ...
            return send_file(
                logo.filepath,
                mimetype=f"image/{suffix}",
                last_modified=datetime.datetime.now(),
            )
    else:
        abort(404)


#  small version (copy/paste from get_logo
@bp.route("/ScoDoc/logos/<name>/small", defaults={"dept_id": None})
@bp.route("/ScoDoc/<int:dept_id>/logos/<name>/small")
@admin_required
def get_logo_small(name: str, dept_id: int):
    strict = request.args.get("strict", "False")
    return _return_logo(
        name,
        dept_id=dept_id,
        small=True,
        strict=strict.upper() not in ["0", "FALSE"],
    )


@bp.route(
    "/ScoDoc/logos/<name>", defaults={"dept_id": None}
)  # if dept not specified, take global logo
@bp.route("/ScoDoc/<int:dept_id>/logos/<name>")
@admin_required
def get_logo(name: str, dept_id: int):
    strict = request.args.get("strict", "False")
    return _return_logo(
        name,
        dept_id=dept_id,
        small=False,
        strict=strict.upper() not in ["0", "FALSE"],
    )


# ---
@bp.route("/ScoDoc/ue_colors_css/<int:formation_id>/<int:semestre_idx>")
def ue_colors_css(formation_id: int, semestre_idx: int):
    """Feuille de style pour les couleurs d'UE"""
    ues = UniteEns.query.filter_by(
        formation_id=formation_id, semestre_idx=semestre_idx
    ).order_by(UniteEns.numero)
    txt = (
        ":root{\n"
        + "\n".join(
            [
                f"--color-UE{semestre_idx}-{ue_idx+1}: {ue.color};"
                for ue_idx, ue in enumerate(ues)
                if ue.color
            ]
        )
        + "\n}\n"
    )
    response = make_response(txt)
    response.headers["Content-Type"] = "text/css"
    return response


# essais
# @bp.route("/testlog")
# def testlog():
#     import time
#     from flask import current_app
#     from app import log

#     log(f"testlog called: handlers={current_app.logger.handlers}")
#     current_app.logger.debug(f"testlog message DEBUG")
#     current_app.logger.info(f"testlog message INFO")
#     current_app.logger.warning(f"testlog message WARNING")
#     current_app.logger.error(f"testlog message ERROR")
#     current_app.logger.critical(f"testlog message CRITICAL")
#     raise SyntaxError("une erreur de syntaxe")
#     return "testlog completed at " + str(time.time())