# pylint: disable=missing-docstring

import re
from ansible.errors import AnsibleError
from ansible.plugins.lookup import LookupBase


class LookupModule(LookupBase):
    # pylint: disable=too-many-branches,too-many-statements,too-many-arguments

    def run(self, terms, variables=None, zones_enabled=True, short_version=None,
            deployment_type=None, **kwargs):

        priorities = [
            {'name': 'LeastRequestedPriority', 'weight': 1},
            {'name': 'BalancedResourceAllocation', 'weight': 1},
            {'name': 'SelectorSpreadPriority', 'weight': 1}
        ]

        if short_version is None or deployment_type is None:
            if 'openshift' not in variables:
                raise AnsibleError("This lookup module requires openshift_facts to be run prior to use")

        if deployment_type is None:
            if 'common' not in variables['openshift'] or 'deployment_type' not in variables['openshift']['common']:
                raise AnsibleError("This lookup module requires that the deployment_type be set")

            deployment_type = variables['openshift']['common']['deployment_type']

        if short_version is None:
            if 'short_version' in variables['openshift']['common']:
                short_version = variables['openshift']['common']['short_version']
            elif 'openshift_release' in variables:
                release = variables['openshift_release']
                if release.startswith('v'):
                    short_version = release[1:]
                else:
                    short_version = release
                short_version = '.'.join(short_version.split('.')[0:2])
            elif 'openshift_version' in variables:
                version = variables['openshift_version']
                short_version = '.'.join(version.split('.')[0:2])
            else:
                # pylint: disable=line-too-long
                raise AnsibleError("Either OpenShift needs to be installed or openshift_release needs to be specified")

        if deployment_type == 'origin':
            if short_version not in ['1.1', '1.2', '1.3', '1.4']:
                raise AnsibleError("Unknown short_version %s" % short_version)
        elif deployment_type == 'openshift-enterprise':
            if short_version not in ['3.1', '3.2', '3.3', '3.4']:
                raise AnsibleError("Unknown short_version %s" % short_version)
        else:
            raise AnsibleError("Unknown deployment_type %s" % deployment_type)

        if deployment_type == 'openshift-enterprise':
            # convert short_version to origin short_version
            short_version = re.sub('^3.', '1.', short_version)

        if short_version == '1.4':
            priorities.append({'name': 'NodePreferAvoidPodsPriority', 'weight': 10000})

        # only 1.1 didn't include NodeAffinityPriority
        if short_version != '1.1':
            priorities.append({'name': 'NodeAffinityPriority', 'weight': 1})

        if short_version not in ['1.1', '1.2']:
            priorities.append({'name': 'TaintTolerationPriority', 'weight': 1})

        if short_version not in ['1.1', '1.2', '1.3']:
            priorities.append({'name': 'InterPodAffinityPriority', 'weight': 1})

        if zones_enabled:
            zone_priority = {
                'name': 'Zone',
                'argument': {
                    'serviceAntiAffinity': {
                        'label': 'zone'
                    }
                },
                'weight': 2
            }
            priorities.append(zone_priority)

        return priorities
