from datetime import datetime
from os import listdir
from os.path import isfile, join
from subprocess import check_output

from bundlewrap.utils.ui import io

zone_path = join(repo.path, 'data', 'powerdns', 'files', 'bind-zones')

nameservers = set()
for rnode in sorted(repo.nodes_in_group('dns')):
    nameservers.add(rnode.metadata.get('powerdns/my_hostname', rnode.metadata.get('hostname')))

my_primary_servers = set()
for ips in node.metadata.get('powerdns/my_primary_servers', {}).values():
    my_primary_servers.update(ips)

directories = {
    '/etc/powerdns/pdns.d': {
        'purge': True,
        'needs': {
            'pkg_apt:pdns-server',
            'pkg_apt:pdns-backend-bind',
            'pkg_apt:pdns-backend-pgsql',
        },
        'triggers': {
            'svc_systemd:pdns:restart',
        },
    },
    '/var/lib/powerdns/zones': {
        'purge': True,
        'needs': {
            'pkg_apt:pdns-backend-bind',
        },
    }
}

files = {
    '/etc/powerdns/pdns.conf': {
        'content_type': 'mako',
        'context': {
            'api_key': node.metadata.get('powerdns/api_key'),
            'my_hostname': node.metadata.get('powerdns/my_hostname', node.metadata.get('hostname')),
            'is_secondary': node.metadata.get('powerdns/is_secondary', False),
            'my_primary_servers': my_primary_servers,
            'my_secondary_servers': node.metadata.get('powerdns/my_secondary_servers', set()),
        },
        'needs': {
            'pkg_apt:pdns-server',
        },
        'triggers': {
            'svc_systemd:pdns:restart',
        },
    },
}

svc_systemd = {
    'pdns': {
        'needs': {
            'pkg_apt:pdns-server',
            'pkg_apt:pdns-backend-bind',
            'pkg_apt:pdns-backend-pgsql',
        },
    },
}

actions = {
    'powerdns_reload_zones': {
        'triggered': True,
        'command': r'pdns_control rediscover; pdns_control reload; pdns_control notify \*',
        'after': {
            'svc_systemd:pdns',
        },
    },
}

if node.metadata.get('powerdns/features/bind', False):
    primary_zones = set()
    for zone in listdir(zone_path):
        if not isfile(join(zone_path, zone)) or zone.startswith(".") or zone.startswith("_"):
            continue

        try:
            output = check_output(['git', 'log', '-1', '--pretty=%ci']).decode('utf-8').strip()
            serial = datetime.strptime(output, '%Y-%m-%d %H:%M:%S %z').strftime('%y%m%d%H%M')
        except Exception as e:
            io.stderr(f"Error while parsing commit time for {zone} serial: {e!r}")
            serial = datetime.now().strftime('%y%m%d0000')

        primary_zones.add(zone)

        files[f'/var/lib/powerdns/zones/{zone}'] = {
            'content_type': 'mako',
            'context': {
                'NAMESERVERS': '\n'.join(sorted({f'@ IN NS {ns}.' for ns in nameservers})),
                'SERIAL': serial,
                'metadata_records': node.metadata.get(f'powerdns/bind-zones/{zone}/records', []),
            },
            'source': f'bind-zones/{zone}',
            'test_with': f'named-checkzone {zone} {{}}',
            'triggers': {
                'action:powerdns_reload_zones',
            },
            'needed_by': {
                'svc_systemd:pdns',
            },
        }

    files['/etc/powerdns/pdns.d/bind.conf'] = {
        'needs': {
            'pkg_apt:pdns-backend-bind',
        },
        'needed_by': {
            'svc_systemd:pdns',
        },
        'triggers': {
            'action:powerdns_reload_zones',
        },
    }

    files['/etc/powerdns/named.conf'] = {
        'content_type': 'mako',
        'context': {
            'zones': primary_zones,
        },
        'needs': {
            'pkg_apt:pdns-backend-bind',
        },
        'needed_by': {
            'svc_systemd:pdns',
        },
        'triggers': {
            'action:powerdns_reload_zones',
        },
    }
else:
    files['/etc/powerdns/named.conf'] = {
        'delete': True,
        'needed_by': {
            'svc_systemd:pdns',
        },
        'triggers': {
            'action:powerdns_reload_zones',
        },
    }

if node.metadata.get('powerdns/features/pgsql', node.has_bundle('postgresql')):
    files['/etc/powerdns/pdns.d/pgsql.conf'] = {
        'content_type': 'mako',
        'context': {
            'password': node.metadata.get('postgresql/roles/powerdns/password'),
        },
        'needs': {
            'pkg_apt:pdns-backend-pgsql',
        },
        'needed_by': {
            'svc_systemd:pdns',
        },
        'triggers': {
            'action:powerdns_reload_zones',
        },
    }

    actions['powerdns_load_pgsql_schema'] = {
        'command': node.metadata.get('postgresql/roles/powerdns/password').format_into('PGPASSWORD={} psql -h 127.0.0.1 -d powerdns -U powerdns -w < /usr/share/pdns-backend-pgsql/schema/schema.pgsql.sql'),
        'unless': r'sudo -u postgres psql -d powerdns -c "\dt" | grep domains 2>&1 >/dev/null',
        'needs': {
            'bundle:postgresql',
            'pkg_apt:pdns-backend-pgsql',
        },
        'needed_by': {
            'svc_systemd:pdns',
        },
    }

    for hostname, ips in node.metadata.get('powerdns/my_primary_servers', {}).items():
        for ip in ips:
            ip_name = ip.replace(':', '-')

            actions[f'powerdns_ensure_{ip_name}_in_autoprimaries'] = {
                'command': f'psql -c "INSERT INTO supermasters (ip, nameserver, account) VALUES (\'{ip}\', \'{hostname}\', \'admin\')" powerdns',
                'unless': f'test -n \"$(psql -tAqc "SELECT nameserver FROM supermasters WHERE ip = \'{ip}\'" powerdns)\"',
                'triggers': {
                    'action:powerdns_fix_primaries',
                },
                'after': {
                    'action:powerdns_load_pgsql_schema',
                },
            }

            actions[f'powerdns_ensure_{hostname}_matches_{ip_name}_in_autoprimaries'] = {
                'command': f'psql -c "UPDATE supermasters SET nameserver = \'{hostname}\' WHERE ip = \'{ip}\'" powerdns',
                'unless': f'bash -c "[ \"$(psql -tAqc "SELECT nameserver FROM supermasters WHERE ip = \'{ip}\'" powerdns)\" == \"{hostname}\" ]"',
                'triggers': {
                    'action:powerdns_fix_primaries',
                },
                'after': {
                    f'action:powerdns_ensure_{ip_name}_in_autoprimaries',
                },
            }

    actions['powerdns_fix_primaries'] = {
        'command': f'psql -c "UPDATE domains SET master = \'{", ".join(sorted(my_primary_servers))}\'" powerdns',
        'triggered': True,
    }