__filename__ = "migrate.py"
__author__ = "Bob Mottram"
__license__ = "AGPL3+"
__version__ = "1.2.0"
__maintainer__ = "Bob Mottram"
__email__ = "bob@libreserver.org"
__status__ = "Production"
__module_group__ = "Core"

import os
from utils import is_account_dir
from utils import get_nickname_from_actor
from utils import get_domain_from_actor
from utils import acct_dir
from utils import has_group_type
from webfinger import webfinger_handle
from blocking import is_blocked
from posts import get_user_url
from follow import unfollow_account
from person import get_actor_json


def _move_following_handles_for_account(base_dir: str,
                                        nickname: str, domain: str,
                                        session,
                                        http_prefix: str,
                                        cached_webfingers: {},
                                        debug: bool,
                                        signing_priv_key_pem: str) -> int:
    """Goes through all follows for an account and updates any that have moved
    """
    ctr = 0
    followingFilename = acct_dir(base_dir, nickname, domain) + '/following.txt'
    if not os.path.isfile(followingFilename):
        return ctr
    with open(followingFilename, 'r') as f:
        followingHandles = f.readlines()
        for followHandle in followingHandles:
            followHandle = followHandle.strip("\n").strip("\r")
            ctr += \
                _update_moved_handle(base_dir, nickname, domain,
                                     followHandle, session,
                                     http_prefix, cached_webfingers,
                                     debug, signing_priv_key_pem)
    return ctr


def _update_moved_handle(base_dir: str, nickname: str, domain: str,
                         handle: str, session,
                         http_prefix: str, cached_webfingers: {},
                         debug: bool, signing_priv_key_pem: str) -> int:
    """Check if an account has moved, and if so then alter following.txt
    for each account.
    Returns 1 if moved, 0 otherwise
    """
    ctr = 0
    if '@' not in handle:
        return ctr
    if len(handle) < 5:
        return ctr
    if handle.startswith('@'):
        handle = handle[1:]
    wf_request = webfinger_handle(session, handle,
                                  http_prefix, cached_webfingers,
                                  domain, __version__, debug, False,
                                  signing_priv_key_pem)
    if not wf_request:
        print('updateMovedHandle unable to webfinger ' + handle)
        return ctr

    if not isinstance(wf_request, dict):
        print('updateMovedHandle webfinger for ' + handle +
              ' did not return a dict. ' + str(wf_request))
        return ctr

    personUrl = None
    if wf_request.get('errors'):
        print('wf_request error: ' + str(wf_request['errors']))
        return ctr

    if not personUrl:
        personUrl = get_user_url(wf_request, 0, debug)
        if not personUrl:
            return ctr

    gnunet = False
    if http_prefix == 'gnunet':
        gnunet = True
    personJson = \
        get_actor_json(domain, personUrl, http_prefix, gnunet, debug, False,
                       signing_priv_key_pem, None)
    if not personJson:
        return ctr
    if not personJson.get('movedTo'):
        return ctr
    movedToUrl = personJson['movedTo']
    if '://' not in movedToUrl:
        return ctr
    if '.' not in movedToUrl:
        return ctr
    movedToNickname = get_nickname_from_actor(movedToUrl)
    if not movedToNickname:
        return ctr
    movedToDomain, movedToPort = get_domain_from_actor(movedToUrl)
    if not movedToDomain:
        return ctr
    movedToDomainFull = movedToDomain
    if movedToPort:
        if movedToPort != 80 and movedToPort != 443:
            movedToDomainFull = movedToDomain + ':' + str(movedToPort)
    group_account = has_group_type(base_dir, movedToUrl, None)
    if is_blocked(base_dir, nickname, domain,
                  movedToNickname, movedToDomain):
        # someone that you follow has moved to a blocked domain
        # so just unfollow them
        unfollow_account(base_dir, nickname, domain,
                         movedToNickname, movedToDomainFull,
                         debug, group_account, 'following.txt')
        return ctr

    followingFilename = acct_dir(base_dir, nickname, domain) + '/following.txt'
    if os.path.isfile(followingFilename):
        with open(followingFilename, 'r') as f:
            followingHandles = f.readlines()

            movedToHandle = movedToNickname + '@' + movedToDomainFull
            handleLower = handle.lower()

            refollowFilename = \
                acct_dir(base_dir, nickname, domain) + '/refollow.txt'

            # unfollow the old handle
            with open(followingFilename, 'w+') as f:
                for followHandle in followingHandles:
                    if followHandle.strip("\n").strip("\r").lower() != \
                       handleLower:
                        f.write(followHandle)
                    else:
                        handleNickname = handle.split('@')[0]
                        handleDomain = handle.split('@')[1]
                        unfollow_account(base_dir, nickname, domain,
                                         handleNickname,
                                         handleDomain,
                                         debug, group_account, 'following.txt')
                        ctr += 1
                        print('Unfollowed ' + handle + ' who has moved to ' +
                              movedToHandle)

                        # save the new handles to the refollow list
                        if os.path.isfile(refollowFilename):
                            with open(refollowFilename, 'a+') as f:
                                f.write(movedToHandle + '\n')
                        else:
                            with open(refollowFilename, 'w+') as f:
                                f.write(movedToHandle + '\n')

    followersFilename = \
        acct_dir(base_dir, nickname, domain) + '/followers.txt'
    if os.path.isfile(followersFilename):
        with open(followersFilename, 'r') as f:
            followerHandles = f.readlines()

            handleLower = handle.lower()

            # remove followers who have moved
            with open(followersFilename, 'w+') as f:
                for followerHandle in followerHandles:
                    if followerHandle.strip("\n").strip("\r").lower() != \
                       handleLower:
                        f.write(followerHandle)
                    else:
                        ctr += 1
                        print('Removed follower who has moved ' + handle)

    return ctr


def migrate_accounts(base_dir: str, session,
                     http_prefix: str, cached_webfingers: {},
                     debug: bool, signing_priv_key_pem: str) -> int:
    """If followed accounts change then this modifies the
    following lists for each account accordingly.
    Returns the number of accounts migrated
    """
    # update followers and following lists for each account
    ctr = 0
    for subdir, dirs, files in os.walk(base_dir + '/accounts'):
        for handle in dirs:
            if not is_account_dir(handle):
                continue
            nickname = handle.split('@')[0]
            domain = handle.split('@')[1]
            ctr += \
                _move_following_handles_for_account(base_dir, nickname, domain,
                                                    session, http_prefix,
                                                    cached_webfingers, debug,
                                                    signing_priv_key_pem)
        break
    return ctr