__filename__ = "daemon_post_links.py"
__author__ = "Bob Mottram"
__license__ = "AGPL3+"
__version__ = "1.5.0"
__maintainer__ = "Bob Mottram"
__email__ = "bob@libreserver.org"
__status__ = "Production"
__module_group__ = "Core POST"

import os
import errno
from socket import error as SocketError
from utils import dangerous_markup
from utils import get_instance_url
from utils import get_nickname_from_actor
from utils import is_editor
from utils import get_config_param
from httpheaders import redirect_headers
from content import extract_text_fields_in_post


def links_update(self, calling_domain: str, cookie: str,
                 path: str, base_dir: str, debug: bool,
                 default_timeline: str,
                 allow_local_network_access: bool) -> None:
    """Updates the left links column of the timeline
    """
    users_path = path.replace('/linksdata', '')
    users_path = users_path.replace('/editlinks', '')
    actor_str = \
        get_instance_url(calling_domain,
                         self.server.http_prefix,
                         self.server.domain_full,
                         self.server.onion_domain,
                         self.server.i2p_domain) + \
        users_path

    boundary = None
    if ' boundary=' in self.headers['Content-type']:
        boundary = self.headers['Content-type'].split('boundary=')[1]
        if ';' in boundary:
            boundary = boundary.split(';')[0]

    # get the nickname
    nickname = get_nickname_from_actor(actor_str)
    editor = None
    if nickname:
        editor = is_editor(base_dir, nickname)
    if not nickname or not editor:
        if not nickname:
            print('WARN: nickname not found in ' + actor_str)
        else:
            print('WARN: nickname is not a moderator' + actor_str)
        redirect_headers(self, actor_str, cookie, calling_domain)
        self.server.postreq_busy = False
        return

    if self.headers.get('Content-length'):
        length = int(self.headers['Content-length'])

        # check that the POST isn't too large
        if length > self.server.max_post_length:
            print('Maximum links data length exceeded ' + str(length))
            redirect_headers(self, actor_str, cookie, calling_domain)
            self.server.postreq_busy = False
            return

    try:
        # read the bytes of the http form POST
        post_bytes = self.rfile.read(length)
    except SocketError as ex:
        if ex.errno == errno.ECONNRESET:
            print('EX: connection was reset while ' +
                  'reading bytes from http form POST')
        else:
            print('EX: error while reading bytes ' +
                  'from http form POST')
        self.send_response(400)
        self.end_headers()
        self.server.postreq_busy = False
        return
    except ValueError as ex:
        print('EX: failed to read bytes for POST, ' + str(ex))
        self.send_response(400)
        self.end_headers()
        self.server.postreq_busy = False
        return

    links_filename = base_dir + '/accounts/links.txt'
    about_filename = base_dir + '/accounts/about.md'
    tos_filename = base_dir + '/accounts/tos.md'
    specification_filename = base_dir + '/accounts/activitypub.md'

    if not boundary:
        if b'--LYNX' in post_bytes:
            boundary = '--LYNX'

    if boundary:
        # extract all of the text fields into a dict
        fields = \
            extract_text_fields_in_post(post_bytes, boundary, debug, None)

        if fields.get('editedLinks'):
            links_str = fields['editedLinks']
            if fields.get('newColLink'):
                if links_str:
                    if not links_str.endswith('\n'):
                        links_str += '\n'
                links_str += fields['newColLink'] + '\n'
            try:
                with open(links_filename, 'w+',
                          encoding='utf-8') as linksfile:
                    linksfile.write(links_str)
            except OSError:
                print('EX: _links_update unable to write ' +
                      links_filename)
        else:
            if fields.get('newColLink'):
                # the text area is empty but there is a new link added
                links_str = fields['newColLink'] + '\n'
                try:
                    with open(links_filename, 'w+',
                              encoding='utf-8') as linksfile:
                        linksfile.write(links_str)
                except OSError:
                    print('EX: _links_update unable to write ' +
                          links_filename)
            else:
                if os.path.isfile(links_filename):
                    try:
                        os.remove(links_filename)
                    except OSError:
                        print('EX: _links_update unable to delete ' +
                              links_filename)

        admin_nickname = \
            get_config_param(base_dir, 'admin')
        if nickname == admin_nickname:
            if fields.get('editedAbout'):
                about_str = fields['editedAbout']
                if not dangerous_markup(about_str,
                                        allow_local_network_access, []):
                    try:
                        with open(about_filename, 'w+',
                                  encoding='utf-8') as aboutfile:
                            aboutfile.write(about_str)
                    except OSError:
                        print('EX: unable to write about ' +
                              about_filename)
            else:
                if os.path.isfile(about_filename):
                    try:
                        os.remove(about_filename)
                    except OSError:
                        print('EX: _links_update unable to delete ' +
                              about_filename)

            if fields.get('editedTOS'):
                tos_str = fields['editedTOS']
                if not dangerous_markup(tos_str,
                                        allow_local_network_access, []):
                    try:
                        with open(tos_filename, 'w+',
                                  encoding='utf-8') as tosfile:
                            tosfile.write(tos_str)
                    except OSError:
                        print('EX: unable to write TOS ' + tos_filename)
            else:
                if os.path.isfile(tos_filename):
                    try:
                        os.remove(tos_filename)
                    except OSError:
                        print('EX: _links_update unable to delete ' +
                              tos_filename)

            if fields.get('editedSpecification'):
                specification_str = fields['editedSpecification']
                try:
                    with open(specification_filename, 'w+',
                              encoding='utf-8') as specificationfile:
                        specificationfile.write(specification_str)
                except OSError:
                    print('EX: unable to write specification ' +
                          specification_filename)
            else:
                if os.path.isfile(specification_filename):
                    try:
                        os.remove(specification_filename)
                    except OSError:
                        print('EX: _links_update unable to delete ' +
                              specification_filename)

    # redirect back to the default timeline
    redirect_headers(self, actor_str + '/' + default_timeline,
                     cookie, calling_domain)
    self.server.postreq_busy = False