from typing import Any, Dict, Iterable

from listtypes import MathebauMLType as MLType

# source of which keys exist: https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/rest/docs/listconf.html
_DEFAULTS: Dict[str, Any] = {
    # individual
    'display_name': None,
    'description': None,
    'info': None,
    'subject_prefix': None,
    'acceptable_aliases': [],
    'accept_these_nonmembers': [],  # TODO: for internal lists, allow @mathebau addresses?
    'hold_these_nonmembers': [],
    'reject_these_nonmembers': [],
    'discard_these_nonmembers': [],

    # type-specific
    'advertised': {
        MLType.internalPublic: True,
        MLType.internalPrivate: False,
        MLType.broadPublic: True,
        MLType.broadPrivate: False,
    },
    'send_goodbye_message': False,  # TODO: entscheiden was in diesen 4 zu tun
    'send_welcome_message': False,  # TODO
    'admin_immed_notify': False,  # TODO
    'admin_notify_mchanges': True,  # TODO
    'default_member_action': {
        MLType.internalPublic: 'accept',
        MLType.internalPrivate: 'accept',
        MLType.broadPublic: 'hold',
        MLType.broadPrivate: 'hold',
    },
    'default_nonmember_action': {
        MLType.internalPublic: 'hold',  # TODO: wie strikt hier? erlauben?
        MLType.internalPrivate: 'hold',  # TODO: wie strikt hier? erlauben?
        MLType.broadPublic: 'hold',
        MLType.broadPrivate: 'hold',
    },
    'max_message_size': {
        MLType.internalPublic: 0,
        MLType.internalPrivate: 0,
        MLType.broadPublic: 200,
        MLType.broadPrivate: 200,
    },
    'subscription_policy': {
        MLType.internalPublic: 'confirm',
        MLType.internalPrivate: 'confirm_then_moderate',
        MLType.broadPublic: 'confirm',
        MLType.broadPrivate: 'confirm_then_moderate',
    },
    'unsubscription_policy': {
        MLType.internalPublic: 'open',
        MLType.internalPrivate: 'confirm',
        MLType.broadPublic: 'open',
        MLType.broadPrivate: 'confirm',
    },

    # general
    # - list identity
    'preferred_language': 'de',
    'member_roster_visibility': 'members',  # TODO: was hat das für Auswirkungen?
    'gateway_to_mail': False,
    'gateway_to_news': False,
    'linked_newsgroup': '',
    'newsgroup_moderation': 'moderated',
    'nntp_prefix_subject_too': True,
    # - automatic responses
    'autorespond_owner': 'none',
    'autoresponse_owner_text': '',
    'autorespond_postings': 'none',
    'autoresponse_postings_text': '',
    'autorespond_requests': 'none',
    'autoresponse_request_text': '',
    'autoresponse_grace_period': '7d',
    'respond_to_post_requests': True,  # TODO: wie sieht diese Autoresponse aus?
    # - alter messages
    'personalize': 'none',
    'filter_content': True,  # TODO: entscheide folgende 5
    'filter_extensions': ['.mkv'],  # TODO
    'filter_types': ['application/zip'],  # TODO
    'pass_extensions': ['.pdf'],  # TODO
    'pass_types': ['image/jpeg'],  # TODO
    'collapse_alternatives': False,  # TODO: wie strikt sind wir? Hier True?
    'filter_action': 'preserve',  # TODO
    'convert_html_to_plaintext': True,  # TODO: wie strikt?
    'anonymous_list': False,
    'include_rfc2369_headers': True,
    'allow_list_posts': False,
    'reply_to_address': '',
    'first_strip_reply_to': False,
    'reply_goes_to_list': 'no_munging',
    'posting_pipeline': 'default-posting-pipeline',
    # - DMARC-Mitigations
    'dmarc_mitigate_action': 'munge_from',  # TODO: Serverteam fragen, was sie hier wollen
    'dmarc_mitigate_unconditionally': False,
    'dmarc_moderation_notice': 'Nachricht als DMARC-Gegenmaßnahme abgelehnt.',
    'dmarc_wrapped_message_text': 'Diese Nachricht wurde eingepackt, da die DMARC-Sicherheitsrichtlinien'
                                  ' des sendenden Mailservers mit Mailinglisten inkompatibel sind.',
    # - Digest
    'digests_enabled': True,
    'digest_send_periodic': True,
    'digest_volume_frequency': 'monthly',
    'digest_size_threshold': 30.0,
    # - Message Acceptance
    'require_explicit_destination': True,
    'administrivia': True,
    'emergency': False,
    'max_num_recipients': '10',
    # - Archiving
    'archive_policy': 'never',
    # - Member Policy
    # --- only *_policy here, which is at type-specific
    # - Bounce Processing
    'process_bounces': True,  # TODO: @Serverteam, what is your policy?
    'bounce_score_threshold': 5,
    'bounce_info_stale_after': '30d',  # should be long enough for non-active mailinglists
    'bounce_notify_owner_on_disable': True,
    'bounce_notify_owner_on_removal': True,
    'bounce_notify_owner_on_bounce_increment': False,  # could be interesting, but probably only for debugging
    'bounce_you_are_disabled_warnings_interval': '3d',
    'bounce_you_are_disabled_warnings': 5,
    # - those do not exist in Postorius' Webinterface
    'archive_rendering_mode': 'text',
    'forward_unrecognized_bounces_to': 'administrators',
    'moderator_password': 'keinparkhaussondernmathebau',
    'max_days_to_hold': '42',
}


def get_single_default(key: str, listtype: MLType) -> Any:
    """Get the default value for a single key of a specific list type"""
    val = _DEFAULTS.get(key)
    if isinstance(val, dict):
        return val.get(listtype)
    return val


def get_config_keys() -> Iterable[str]:
    """Get names of all config attributes a mailinglist has."""
    return _DEFAULTS.keys()


def get_default_config(listtype: MLType) -> Dict[str, Any]:
    """Get the default config set for a mailinglist of a given type.

    Keys with value `None` should be set individually for each list."""
    ret = dict()
    for key in get_config_keys():
        ret[key] = get_single_default(key, listtype)
    return ret