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

"""Definition of ScoDoc permissions
    used by auth
"""

# Définition des permissions: ne pas changer les numéros ou l'ordre des lignes !
_SCO_PERMISSIONS = (
    # permission bit, symbol, description
    # ScoSuperAdmin est utilisé pour:
    #   - add/delete departments
    #   - tous rôles lors creation utilisateurs
    (1 << 1, "ScoSuperAdmin", "Super Administrateur"),
    (1 << 2, "ScoView", "Voir"),
    (1 << 3, "ScoEnsView", "Voir les parties pour les enseignants"),
    (1 << 4, "ScoObservateur", "Observer (accès lecture restreint aux bulletins)"),
    (1 << 5, "ScoUsersAdmin", "Gérer les utilisateurs (de son département)"),
    (1 << 6, "ScoUsersView", "Voir les utilisateurs (de tous les dépts)"),
    (1 << 7, "ScoChangePreferences", "Modifier les préférences"),
    (1 << 8, "ScoChangeFormation", "Changer les formations"),
    (1 << 9, "ScoEditFormationTags", "Tagguer les formations"),
    (1 << 10, "ScoEditAllNotes", "Modifier toutes les notes"),
    (1 << 11, "ScoEditAllEvals", "Modifier toutes les evaluations"),
    (1 << 12, "ScoImplement", "Mettre en place une formation (créer un semestre)"),
    (1 << 13, "ScoAbsChange", "Saisir des absences"),
    (1 << 14, "ScoAbsAddBillet", "Saisir des billets d'absences"),
    # changer adresse/photo ou pour envoyer bulletins par mail ou pour debouche
    (1 << 15, "ScoEtudChangeAdr", "Changer les addresses d'étudiants"),
    (
        1 << 16,
        "APIEditGroups",
        "API: Modifier les groupes (obsolete, use ScoEtudChangeGroups)",
    ),
    (1 << 16, "ScoEtudChangeGroups", "Modifier les groupes"),
    # aussi pour demissions, diplomes:
    (1 << 17, "ScoEtudInscrit", "Inscrire des étudiants"),
    # aussi pour archives:
    (1 << 18, "ScoEtudAddAnnotations", "Éditer les annotations"),
    (1 << 19, "ScoEntrepriseView", "Voir la section 'entreprises'"),
    (1 << 20, "ScoEntrepriseChange", "Modifier les entreprises"),
    (1 << 21, "ScoEditPVJury", "Éditer les PV de jury"),
    # ajouter maquettes Apogee (=> chef dept et secr):
    (1 << 22, "ScoEditApo", "Ajouter des maquettes Apogées"),
    # Application relations entreprises
    (1 << 23, "RelationsEntreprisesView", "Voir l'application relations entreprises"),
    (1 << 24, "RelationsEntreprisesChange", "Modifier les entreprises"),
    (1 << 25, "RelationsEntreprisesSend", "Envoyer des offres"),
    (1 << 26, "RelationsEntreprisesValidate", "Valide les entreprises"),
    (1 << 27, "RelationsEntreprisesCorrespondants", "Voir les correspondants"),
    (
        1 << 28,
        "RelationsEntreprisesExport",
        "Exporter les données de l'application relations entreprises",
    ),
    # 27 à 39 ... réservé pour "entreprises"
    (1 << 40, "ScoEtudChangePhoto", "Modifier la photo d'un étudiant"),
    (1 << 40, "ScoAssiduiteChange", "Modifier les assiduités"),
    (1 << 41, "ScoJustifChange", "Modifier les justificatifs"),
)


class Permission:
    "Permissions for ScoDoc"
    NBITS = 1  # maximum bits used (for formatting)
    ALL_PERMISSIONS = [-1]
    description = {}  # { symbol : blah blah }
    permission_by_name = {}  # { symbol : int }
    permission_by_value = {}  # { int : symbol }

    @staticmethod
    def init_permissions():
        for (perm, symbol, description) in _SCO_PERMISSIONS:
            setattr(Permission, symbol, perm)
            Permission.description[symbol] = description
            Permission.permission_by_name[symbol] = perm
            Permission.permission_by_value[perm] = symbol
        max_perm = max(p[0] for p in _SCO_PERMISSIONS)
        Permission.NBITS = max_perm.bit_length()

    @staticmethod
    def get_by_name(permission_name: str) -> int:
        """Return permission mode (integer bit field), or None if it doesn't exist."""
        return Permission.permission_by_name.get(permission_name)

    @staticmethod
    def get_name(permission: int) -> str:
        """Return permission name, or None if it doesn't exist."""
        return Permission.permission_by_value.get(permission)

    @staticmethod
    def permissions_names(permissions: int) -> list[str]:
        """From a bit field, return list of permission names"""
        names = []
        if permissions == 0:
            return []
        mask = 1 << (permissions.bit_length() - 1)
        while mask > 0:
            if mask & permissions:
                name = Permission.get_name(mask)
                if name is not None:
                    names.append(name)
            mask = mask >> 1
        return names


Permission.init_permissions()