# Copyright 2016, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
#
from PyQt5.QtCore import Qt
from setools.exception import RuleNotConditional, RuleUseError

from .models import SEToolsTableModel


class TERuleTableModel(SEToolsTableModel):

    """A table-based model for TE rules."""

    headers = ["Rule Type", "Source", "Target", "Object Class", "Permissions/Default Type",
               "Conditional Expression", "Conditional Block"]

    def data(self, index, role):
        if self.resultlist and index.isValid():
            row = index.row()
            col = index.column()
            rule = self.resultlist[row]

            if role == Qt.DisplayRole:
                if col == 0:
                    return rule.ruletype.name
                elif col == 1:
                    return rule.source.name
                elif col == 2:
                    return rule.target.name
                elif col == 3:
                    return rule.tclass.name
                elif col == 4:
                    try:
                        if rule.extended:
                            return "{0.xperm_type}: {0.perms:,}".format(rule)
                        else:
                            return ", ".join(sorted(rule.perms))
                    except RuleUseError:
                        return rule.default.name
                elif col == 5:
                    try:
                        return str(rule.conditional)
                    except RuleNotConditional:
                        return None
                elif col == 6:
                    try:
                        return str(rule.conditional_block)
                    except RuleNotConditional:
                        return None

            elif role == Qt.UserRole:
                return rule