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# Copyright (C) 2018  Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import ick2


class Build:

    def __init__(self, resource):
        self.acceptable = {
            ick2.BUILD_TRIGGERED: [ick2.BUILD_BUILDING],
            ick2.BUILD_BUILDING: [ick2.BUILD_DONE, ick2.BUILD_FAILED],
        }

        self.resource = resource
        self.graph = ick2.BuildGraph(graph=self.resource.get('graph', {}))
        self.graph.set_observer(self.update_graph_in_resource)

    def get_status(self):
        return self.resource['status']

    def set_status(self, status):
        current = self.get_status()
        if status not in self.acceptable[current]:
            raise WrongBuildStatusChange(current, status)
        self.resource['status'] = status

    def is_finished(self):
        return self.get_status() in (ick2.BUILD_DONE, ick2.BUILD_FAILED)

    def get_graph(self):
        return self.graph

    def update_graph_in_resource(self):
        self.resource['graph'] = self.graph.get_actions()


class WrongBuildStatusChange(Exception):

    def __init__(self, current, new):
        super().__init__(
            'Unacceptable build status change from {} to {}'.format(
                current, new))