##############################################################################
# ScoDoc
# Copyright (c) 1999 - 2022 Emmanuel Viennet.  All rights reserved.
# See LICENSE
##############################################################################

"""
  ScoDoc 9 API : accès aux utilisateurs
"""


from flask import g, jsonify, request
from flask_login import current_user, login_required

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


@bp.route("/user/<int:uid>")
@api_web_bp.route("/user/<int:uid>")
@login_required
@scodoc
@permission_required(Permission.ScoUsersView)
def user_info(uid: int):
    """
    Info sur un compte utilisateur scodoc
    """
    user: User = User.query.get(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.ScoUsersView)
        if user.dept not in allowed_depts:
            return json_error(404, "user not found")

    return jsonify(user.to_dict())


@bp.route("/users/query")
@api_web_bp.route("/users/query")
@login_required
@scodoc
@permission_required(Permission.ScoView)
def users_info_query():
    """Utilisateurs, filtrés par dept, active ou début nom
    /users/query?departement=dept_acronym&active=1&starts_with=<string:nom>

    Si accès via API web, seuls les utilisateurs "accessibles" (selon les
    permissions) sont retournés: le département de l'URL est ignoré, seules
    les permissions de l'utilisateur sont prises en compte.
    """
    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.ScoUsersView) != 0)
    )

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


@bp.route("/user/create", methods=["POST"])
@api_web_bp.route("/user/create", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.ScoUsersAdmin)
def user_create():
    """Création d'un utilisateur
    The request content type should be "application/json":
    {
        "user_name": str,
        "dept": str or null,
        "nom": str,
        "prenom": str,
        "active":bool (default True)
    }
    """
    data = request.get_json(force=True)  # may raise 400 Bad Request
    user_name = data.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 = data.get("dept")
    if dept == "@all":
        dept = None
    allowed_depts = current_user.get_depts_with_permission(Permission.ScoUsersAdmin)
    if 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")
    nom = data.get("nom")
    prenom = data.get("prenom")
    active = scu.to_bool(data.get("active", True))
    user = User(user_name=user_name, active=active, dept=dept, nom=nom, prenom=prenom)
    db.session.add(user)
    db.session.commit()
    return jsonify(user.to_dict())


@bp.route("/user/edit/<int:uid>", methods=["POST"])
@api_web_bp.route("/user/edit/<int:uid>", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.ScoUsersAdmin)
def user_edit(uid: int):
    """Modification d'un utilisateur
    Champs modifiables:
    {
        "dept": str or null,
        "nom": str,
        "prenom": str,
        "active":bool
    }
    """
    data = 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 = data.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.ScoUsersAdmin)
        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

    user.nom = data.get("nom", user.nom)
    user.prenom = data.get("prenom", user.prenom)
    user.active = scu.to_bool(data.get("active", user.active))

    db.session.add(user)
    db.session.commit()
    return jsonify(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)
def user_role_add(uid: int, role_name: str, dept: str = None):
    """Add a role to the user"""
    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 jsonify(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)
def user_role_remove(uid: int, role_name: str, dept: str = None):
    """Remove the role from the user"""
    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 jsonify(user.to_dict())


@bp.route("/permissions")
@api_web_bp.route("/permissions")
@login_required
@scodoc
@permission_required(Permission.ScoUsersView)
def list_permissions():
    """Liste des noms de permissions définies"""
    return jsonify(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.ScoUsersView)
def list_role(role_name: str):
    """Un rôle"""
    return jsonify(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.ScoUsersView)
def list_roles():
    """Tous les rôles définis"""
    return jsonify([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)
def role_permission_add(role_name: str, perm_name: str):
    """Add permission to role"""
    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()
    return jsonify(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)
def role_permission_remove(role_name: str, perm_name: str):
    """Remove permission from role"""
    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()
    return jsonify(role.to_dict())


@bp.route("/role/<string:role_name>/create", methods=["POST"])
@api_web_bp.route("/role/<string:role_name>/create", methods=["POST"])
@login_required
@scodoc
@permission_required(Permission.ScoSuperAdmin)
def role_create(role_name: str):
    """Create a new role with permissions.
    {
        "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 jsonify(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)
def role_edit(role_name: str):
    """Edit a role. On peut spécifier un nom et/ou des permissions.
    {
        "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 jsonify(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)
def role_delete(role_name: str):
    """Delete a role"""
    role: Role = Role.query.filter_by(name=role_name).first_or_404()
    db.session.delete(role)
    db.session.commit()
    return jsonify({"OK": True})