from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from functools import partial

from ansible import errors


def prometheus_job_targets(jobs, vars):
    try:
        result = []
        for job in jobs:
            multitarget_config_varname = 'prometheus_job_multitarget_' + job.replace('-', '_').replace('/', '__')
            if multitarget_config_varname in vars:
                for exporter_hostname, configs in vars[multitarget_config_varname].items():
                    for config in configs:
                        result.append({'job': job, 'instance': config['instance'], 'enabled': True,
                                       'exporter_hostname': exporter_hostname, 'config': config})

            else:
                enabled = job in vars['prometheus_exporters_default'] or job in vars['prometheus_exporters_extra']
                result.append({'job': job, 'instance': vars['inventory_hostname'], 'enabled': enabled})
        return result
    except Exception as e:
        raise errors.AnsibleFilterError("prometheus_job_targets(): %s" % str(e))


class FilterModule(object):

    ''' prometheus filters '''
    filter_map = {
        'prometheus_job_targets': prometheus_job_targets,
    }

    def filters(self):
        return self.filter_map