from __future__ import absolute_import
from __future__ import unicode_literals

import six
import yaml

from compose.config import types
from compose.config.config import V1
from compose.config.config import V2_1


def serialize_config_type(dumper, data):
    representer = dumper.represent_str if six.PY3 else dumper.represent_unicode
    return representer(data.repr())


yaml.SafeDumper.add_representer(types.VolumeFromSpec, serialize_config_type)
yaml.SafeDumper.add_representer(types.VolumeSpec, serialize_config_type)


def denormalize_config(config):
    denormalized_services = [
        denormalize_service_dict(service_dict, config.version)
        for service_dict in config.services
    ]
    services = {
        service_dict.pop('name'): service_dict
        for service_dict in denormalized_services
    }
    networks = config.networks.copy()
    for net_name, net_conf in networks.items():
        if 'external_name' in net_conf:
            del net_conf['external_name']

    volumes = config.volumes.copy()
    for vol_name, vol_conf in volumes.items():
        if 'external_name' in vol_conf:
            del vol_conf['external_name']

    version = config.version
    if version == V1:
        version = V2_1

    return {
        'version': version,
        'services': services,
        'networks': networks,
        'volumes': volumes,
    }


def serialize_config(config):
    return yaml.safe_dump(
        denormalize_config(config),
        default_flow_style=False,
        indent=2,
        width=80)


def serialize_ns_time_value(value):
    result = (value, 'ns')
    table = [
        (1000., 'us'),
        (1000., 'ms'),
        (1000., 's'),
        (60., 'm'),
        (60., 'h')
    ]
    for stage in table:
        tmp = value / stage[0]
        if tmp == int(value / stage[0]):
            value = tmp
            result = (int(value), stage[1])
        else:
            break
    return '{0}{1}'.format(*result)


def denormalize_service_dict(service_dict, version):
    service_dict = service_dict.copy()

    if 'restart' in service_dict:
        service_dict['restart'] = types.serialize_restart_spec(
            service_dict['restart']
        )

    if version == V1 and 'network_mode' not in service_dict:
        service_dict['network_mode'] = 'bridge'

    if 'depends_on' in service_dict and version != V2_1:
        service_dict['depends_on'] = sorted([
            svc for svc in service_dict['depends_on'].keys()
        ])

    if 'healthcheck' in service_dict:
        if 'interval' in service_dict['healthcheck']:
            service_dict['healthcheck']['interval'] = serialize_ns_time_value(
                service_dict['healthcheck']['interval']
            )
        if 'timeout' in service_dict['healthcheck']:
            service_dict['healthcheck']['timeout'] = serialize_ns_time_value(
                service_dict['healthcheck']['timeout']
            )

    if 'secrets' in service_dict:
        service_dict['secrets'] = map(lambda s: s.repr(), service_dict['secrets'])

    return service_dict
