##############################################################################
# ScoDoc
# Copyright (c) 1999 - 2024 Emmanuel Viennet.  All rights reserved.
# See LICENSE
##############################################################################

"""
  ScoDoc 9 API : accès aux utilisateurs

  CATEGORY
  --------
  Utilisateurs
"""

from flask import g, request
from flask_json import as_json
from flask_login import current_user, login_required

from app import db, log
from app.api import api_bp as bp, api_web_bp, API_CLIENT_ERROR
from app.api import api_permission_required as permission_required
from app.auth.models import User, Role, UserRole
from app.auth.models import is_valid_password
from app.decorators import scodoc
from app.models import Departement
from app.scodoc.sco_exceptions import ScoValueError
from app.scodoc.sco_permissions import Permission
from app.scodoc.sco_utils import json_error


@bp.route("/user/<int:uid>")
@api_web_bp.route("/user/<int:uid>")
@login_required
@scodoc
@permission_required(Permission.UsersView)
@as_json
def user_info(uid: int):
    """
    Info sur un compte utilisateur ScoDoc.
    """
    user: User = db.session.get(User, uid)
    if user is None:
        return json_error(404, "user not found")
    if g.scodoc_dept:
        allowed_depts = current_user.get_depts_with_permission(Permission.UsersView)
        if (None not in allowed_depts) and (user.dept not in allowed_depts):
            return json_error(404, "user not found")

    return user.to_dict()


@bp.route("/users/query")
@api_web_bp.route("/users/query")
@login_required
@scodoc
@permission_required(Permission.ScoView)
@as_json
def users_info_query():
    """Utilisateurs, filtrés par dept, active ou début nom

    Exemple:
    ```
    /users/query?departement=dept_acronym&active=1&starts_with=<string:nom>
    ```

    Seuls les utilisateurs "accessibles" (selon les permissions) sont retournés.
    Si accès via API web,  le département de l'URL est ignoré, seules
    les permissions de l'utilisateur sont prises en compte.

    QUERY
    -----
    active: bool
    departement: string
    starts_with: string

    """
    query = User.query
    active = request.args.get("active")
    if active is not None:
        active = bool(str(active))
        query = query.filter_by(active=active)
    departement = request.args.get("departement")
    if departement is not None:
        query = query.filter_by(dept=departement or None)
    starts_with = request.args.get("starts_with")
    if starts_with is not None:
        # remove % and _ for security
        starts_with = starts_with.translate({ord(c): None for c in "%_"})
        query = query.filter(User.nom.ilike(starts_with + "%"))
    # Filtre selon permissions:
    query = (
        query.join(UserRole, (UserRole.dept == User.dept) | (UserRole.dept == None))
        .filter(UserRole.user == current_user)
        .join(Role, UserRole.role_id == Role.id)
        .filter(Role.permissions.op("&")(Permission.UsersView) != 0)
    )

    query = query.order_by(User.user_name)
    return [user.to_dict() for user in query]


def _is_allowed_user_edit(args: dict) -> tuple[bool, str]:
    "Vrai si on peut"
    if "cas_id" in args and not current_user.has_permission(
        Permission.UsersChangeCASId
    ):
        return False, "non autorise a changer cas_id"

    if not current_user.is_administrator():
        for field in ("cas_allow_login", "cas_allow_scodoc_login"):
            if field in args:
                return False, f"non autorise a changer {field}"
    return True, ""


@bp.route("/user/create", methods=["POST"])
@api_web_bp.route("/user/create", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.UsersAdmin)
@as_json
def user_create():
    """Création d'un utilisateur

    DATA
    ----
    ```json
    {
        "active":bool (default True),
        "dept": str or null,
        "nom": str,
        "prenom": str,
        "user_name": str,
        ...
    }
    ```
    """
    args = request.get_json(force=True)  # may raise 400 Bad Request
    user_name = args.get("user_name")
    if not user_name:
        return json_error(404, "empty user_name")
    user = User.query.filter_by(user_name=user_name).first()
    if user:
        return json_error(404, f"user_create: user {user} already exists\n")
    dept = args.get("dept")
    if dept == "@all":
        dept = None
    allowed_depts = current_user.get_depts_with_permission(Permission.UsersAdmin)
    if (None not in allowed_depts) and (dept not in allowed_depts):
        return json_error(403, "user_create: departement non autorise")
    if (dept is not None) and (
        Departement.query.filter_by(acronym=dept).first() is None
    ):
        return json_error(404, "user_create: departement inexistant")
    args["dept"] = dept
    ok, msg = _is_allowed_user_edit(args)
    if not ok:
        return json_error(403, f"user_create: {msg}")
    user = User(user_name=user_name)
    user.from_dict(args, new_user=True)
    db.session.add(user)
    db.session.commit()
    return user.to_dict()


@bp.route("/user/<int:uid>/edit", methods=["POST"])
@api_web_bp.route("/user/<int:uid>/edit", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.UsersAdmin)
@as_json
def user_edit(uid: int):
    """Modification d'un utilisateur.

    Champs modifiables:
    ```json
    {
        "dept": str or null,
        "nom": str,
        "prenom": str,
        "active":bool
        ...
    }
    ```
    """
    args = request.get_json(force=True)  # may raise 400 Bad Request
    user: User = User.query.get_or_404(uid)
    # L'utilisateur doit avoir le droit dans le département de départ et celui d'arrivée
    orig_dept = user.dept
    dest_dept = args.get("dept", False)
    if dest_dept is not False:
        if dest_dept == "@all":
            dest_dept = None
        allowed_depts = current_user.get_depts_with_permission(Permission.UsersAdmin)
        if (None not in allowed_depts) and (
            (orig_dept not in allowed_depts) or (dest_dept not in allowed_depts)
        ):
            return json_error(403, "user_edit: departement non autorise")
        if dest_dept != orig_dept:
            if (dest_dept is not None) and (
                Departement.query.filter_by(acronym=dest_dept).first() is None
            ):
                return json_error(404, "user_edit: departement inexistant")
            user.dept = dest_dept

    ok, msg = _is_allowed_user_edit(args)
    if not ok:
        return json_error(403, f"user_edit: {msg}")

    user.from_dict(args)
    db.session.add(user)
    db.session.commit()
    return user.to_dict()


@bp.route("/user/<int:uid>/password", methods=["POST"])
@api_web_bp.route("/user/<int:uid>/password", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.UsersAdmin)
@as_json
def user_password(uid: int):
    """Modification du mot de passe d'un utilisateur.

    Champs modifiables:
    ```json
    {
        "password": str
    }
    ```.

    Si le mot de passe ne convient pas, erreur 400.
    """
    data = request.get_json(force=True)  # may raise 400 Bad Request
    user: User = User.query.get_or_404(uid)
    password = data.get("password")
    if not password:
        return json_error(404, "user_password: missing password")
    if not is_valid_password(password):
        return json_error(API_CLIENT_ERROR, "user_password: invalid password")
    allowed_depts = current_user.get_depts_with_permission(Permission.UsersAdmin)
    if (None not in allowed_depts) and ((user.dept not in allowed_depts)):
        return json_error(403, "user_password: departement non autorise")
    user.set_password(password)
    db.session.add(user)
    db.session.commit()
    return user.to_dict()


@bp.route("/user/<int:uid>/role/<string:role_name>/add", methods=["POST"])
@api_web_bp.route("/user/<int:uid>/role/<string:role_name>/add", methods=["POST"])
@bp.route(
    "/user/<int:uid>/role/<string:role_name>/add/departement/<string:dept>",
    methods=["POST"],
)
@api_web_bp.route(
    "/user/<int:uid>/role/<string:role_name>/add/departement/<string:dept>",
    methods=["POST"],
)
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
@as_json
def user_role_add(uid: int, role_name: str, dept: str = None):
    """Ajoute un rôle à l'utilisateur dans le département donné."""
    user: User = User.query.get_or_404(uid)
    role: Role = Role.query.filter_by(name=role_name).first_or_404()
    if dept is not None:  # check
        _ = Departement.query.filter_by(acronym=dept).first_or_404()
    allowed_depts = current_user.get_depts_with_permission(Permission.ScoSuperAdmin)
    if (None not in allowed_depts) and (dept not in allowed_depts):
        return json_error(403, "user_role_add: departement non autorise")
    user.add_role(role, dept)
    db.session.add(user)
    db.session.commit()
    return user.to_dict()


@bp.route("/user/<int:uid>/role/<string:role_name>/remove", methods=["POST"])
@api_web_bp.route("/user/<int:uid>/role/<string:role_name>/remove", methods=["POST"])
@bp.route(
    "/user/<int:uid>/role/<string:role_name>/remove/departement/<string:dept>",
    methods=["POST"],
)
@api_web_bp.route(
    "/user/<int:uid>/role/<string:role_name>/remove/departement/<string:dept>",
    methods=["POST"],
)
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
@as_json
def user_role_remove(uid: int, role_name: str, dept: str = None):
    """Retire le rôle (dans le département donné) à cet utilisateur."""
    user: User = User.query.get_or_404(uid)
    role: Role = Role.query.filter_by(name=role_name).first_or_404()
    if dept is not None:  # check
        _ = Departement.query.filter_by(acronym=dept).first_or_404()
    allowed_depts = current_user.get_depts_with_permission(Permission.ScoSuperAdmin)
    if (None not in allowed_depts) and (dept not in allowed_depts):
        return json_error(403, "user_role_remove: departement non autorise")

    query = UserRole.query.filter(UserRole.role == role, UserRole.user == user)
    if dept is not None:
        query = query.filter(UserRole.dept == dept)
    user_role = query.first()
    if user_role:
        db.session.delete(user_role)
        db.session.add(user)
        db.session.commit()
    return user.to_dict()


@bp.route("/permissions")
@api_web_bp.route("/permissions")
@login_required
@scodoc
@permission_required(Permission.UsersView)
@as_json
def permissions_list():
    """Liste des noms de permissions définies."""
    return list(Permission.permission_by_name.keys())


@bp.route("/role/<string:role_name>")
@api_web_bp.route("/role/<string:role_name>")
@login_required
@scodoc
@permission_required(Permission.UsersView)
@as_json
def role_get(role_name: str):
    """Un rôle"""
    return Role.query.filter_by(name=role_name).first_or_404().to_dict()


@bp.route("/roles")
@api_web_bp.route("/roles")
@login_required
@scodoc
@permission_required(Permission.UsersView)
@as_json
def roles_list():
    """Tous les rôles définis."""
    return [role.to_dict() for role in Role.query]


@bp.route(
    "/role/<string:role_name>/add_permission/<string:perm_name>",
    methods=["POST"],
)
@api_web_bp.route(
    "/role/<string:role_name>/add_permission/<string:perm_name>",
    methods=["POST"],
)
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
@as_json
def role_permission_add(role_name: str, perm_name: str):
    """Ajoute une permission à un rôle."""
    role: Role = Role.query.filter_by(name=role_name).first_or_404()
    permission = Permission.get_by_name(perm_name)
    if permission is None:
        return json_error(404, "role_permission_add: permission inconnue")
    role.add_permission(permission)
    db.session.add(role)
    db.session.commit()
    log(f"role_permission_add({role_name}, {perm_name})")
    return role.to_dict()


@bp.route(
    "/role/<string:role_name>/remove_permission/<string:perm_name>",
    methods=["POST"],
)
@api_web_bp.route(
    "/role/<string:role_name>/remove_permission/<string:perm_name>",
    methods=["POST"],
)
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
@as_json
def role_permission_remove(role_name: str, perm_name: str):
    """Retire une permission d'un rôle."""
    role: Role = Role.query.filter_by(name=role_name).first_or_404()
    permission = Permission.get_by_name(perm_name)
    if permission is None:
        return json_error(404, "role_permission_remove: permission inconnue")
    role.remove_permission(permission)
    db.session.add(role)
    db.session.commit()
    log(f"role_permission_remove({role_name}, {perm_name})")
    return role.to_dict()


@bp.route("/role/create/<string:role_name>", methods=["POST"])
@api_web_bp.route("/role/create/<string:role_name>", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
@as_json
def role_create(role_name: str):
    """Création d'un nouveau rôle avec les permissions données.

    DATA
    ----
    ```json
    {
        "permissions" : [ 'ScoView', ... ]
    }
    ```
    """
    role: Role = Role.query.filter_by(name=role_name).first()
    if role:
        return json_error(404, "role_create: role already exists")
    role = Role(name=role_name)
    data = request.get_json(force=True)  # may raise 400 Bad Request
    permissions = data.get("permissions")
    if permissions:
        try:
            role.set_named_permissions(permissions)
        except ScoValueError:
            return json_error(404, "role_create: invalid permissions")
    db.session.add(role)
    db.session.commit()
    return role.to_dict()


@bp.route("/role/<string:role_name>/edit", methods=["POST"])
@api_web_bp.route("/role/<string:role_name>/edit", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
@as_json
def role_edit(role_name: str):
    """Édition d'un rôle. On peut spécifier un nom et/ou des permissions.

    DATA
    ----
    ```json
    {
        "name" : name
        "permissions" : [ 'ScoView', ... ]
    }
    ```
    """
    role: Role = Role.query.filter_by(name=role_name).first_or_404()
    data = request.get_json(force=True)  # may raise 400 Bad Request
    permissions = data.get("permissions", False)
    if permissions is not False:
        try:
            role.set_named_permissions(permissions)
        except ScoValueError:
            return json_error(404, "role_create: invalid permissions")
    role_name = data.get("role_name")
    if role_name and role_name != role.name:
        existing_role: Role = Role.query.filter_by(name=role_name).first()
        if existing_role:
            return json_error(404, "role_edit: role name already exists")
        role.name = role_name
    db.session.add(role)
    db.session.commit()
    return role.to_dict()


@bp.route("/role/<string:role_name>/delete", methods=["POST"])
@api_web_bp.route("/role/<string:role_name>/delete", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
@as_json
def role_delete(role_name: str):
    """Suprression d'un rôle."""
    role: Role = Role.query.filter_by(name=role_name).first_or_404()
    db.session.delete(role)
    db.session.commit()
    return {"OK": True}


# @bp.route("/user/<int:uid>/edt")
# @api_web_bp.route("/user/<int:uid>/edt")
# @login_required
# @scodoc
# @permission_required(Permission.ScoView)
# @as_json
# def user_edt(uid: int):
#     """L'emploi du temps de l'utilisateur.
#     Si ok, une liste d'évènements. Sinon, une chaine indiquant un message d'erreur.

#     show_modules_titles affiche le titre complet du module (défaut), sinon juste le code.

#     Il faut la permission ScoView + (UsersView ou bien être connecté comme l'utilisateur demandé)
#     """
#     if g.scodoc_dept is None:  # route API non départementale
#         if not current_user.has_permission(Permission.UsersView):
#             return scu.json_error(403, "accès non autorisé")
#     user: User = db.session.get(User, uid)
#     if user is None:
#         return json_error(404, "user not found")
#     # Check permission
#     if current_user.id != user.id:
#         if g.scodoc_dept:
#             allowed_depts = current_user.get_depts_with_permission(Permission.UsersView)
#             if (None not in allowed_depts) and (user.dept not in allowed_depts):
#                 return json_error(404, "user not found")

#     show_modules_titles = scu.to_bool(request.args.get("show_modules_titles", False))

#     # Cherche ics
#     if not user.edt_id:
#         return json_error(404, "user not configured")
#     ics_filename = sco_edt_cal.get_ics_user_edt_filename(user.edt_id)
#     if not ics_filename:
#         return json_error(404, "no calendar for this user")

#     _, calendar = sco_edt_cal.load_calendar(ics_filename)

#     # TODO:
#     # - Construire mapping edt2modimpl: edt_id -> modimpl
#     #    pour cela, considérer tous les formsemestres de la période de l'edt
#     #    (soit on considère l'année scolaire du 1er event, ou celle courante,
#     #     soit on cherche min, max des dates des events)
#     # - Modifier décodage des groupes dans convert_ics pour avoi run mapping
#     #    de groupe par semestre (retrouvé grâce au modimpl associé à l'event)

#     raise NotImplementedError()  # TODO XXX WIP

#     events_scodoc, _ = sco_edt_cal.convert_ics(
#         calendar,
#         edt2group=edt2group,
#         default_group=default_group,
#         edt2modimpl=edt2modimpl,
#     )
#     edt_dict = sco_edt_cal.translate_calendar(
#         events_scodoc, group_ids, show_modules_titles=show_modules_titles
#     )
#     return edt_dict