# Copyright 2012 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

# Base class for a jenkins_jobs module

from jenkins_jobs.loc_loader import LocList


class Base(object):
    """
    A base class for a Jenkins Job Builder Module.

    The module is initialized before any YAML is parsed.

    :arg ModuleRegistry registry: the global module registry.
    """

    #: The sequence number for the module.  Modules are invoked in the
    #: order of their sequence number in order to produce consistently
    #: ordered XML output.
    sequence = 10

    #: The component type for components of this module.  This will be
    #: used to look for macros (they are defined singularly, and should
    #: not be plural).
    #: Set both component_type and component_list_type to None if module
    #: doesn't have components.
    component_type = None

    #: The component list type will be used to look up possible
    #: implementations of the component type via entry points (entry
    #: points provide a list of components, so it should be plural).
    #: Set both component_type and component_list_type to None if module
    #: doesn't have components.
    component_list_type = None

    def __init__(self, registry):
        self.registry = registry

    def amend_job_dict(self, job):
        """This method is called before any XML is generated.  By
        overriding this method, a module may arbitrarily modify a job data
        structure which will probably be the JJB Job intermediate data dict
        representation. If it has changed the data structure at all, it must
        return ``True``, otherwise, it must return ``False``.

        :arg dict job: the intermediate representation of job data
            loaded from JJB Yaml files after variables interpolation and other
            yaml expansions.

        :rtype: bool
        """

        return False

    def gen_xml(self, xml_parent, data):
        """Update the XML element tree based on YAML data.  Override
        this method to add elements to the XML output.  Create new
        Element objects and add them to the xml_parent.  The YAML data
        structure must not be modified.

        :arg class:`xml.etree.ElementTree` xml_parent: the parent XML element
        :arg dict data: the YAML data structure
        """

        pass

    def dispatch_component_list(
        self, component_type, component_list, xml_parent, job_data=None
    ):
        if not component_list:
            return
        for idx, component in enumerate(component_list):
            if isinstance(component_list, LocList):
                pos = component_list.value_pos[idx]
            else:
                pos = None
            self.registry.dispatch(
                component_type,
                xml_parent,
                component,
                job_data=job_data,
                component_pos=pos,
            )