from __future__ import absolute_import

from django.http import HttpRequest, HttpResponse

from django.utils.translation import ugettext as _
from django.shortcuts import redirect
from six.moves import map

from zerver.decorator import has_request_variables, REQ, JsonableError, \
    require_realm_admin
from zerver.forms import CreateUserForm
from zerver.lib.actions import do_change_full_name, do_change_is_admin, \
    do_create_user, subscribed_to_stream, do_deactivate_user, do_reactivate_user, \
    do_change_default_events_register_stream, do_change_default_sending_stream, \
    do_change_default_all_public_streams, do_regenerate_api_key, do_change_avatar_source
from zerver.lib.avatar import avatar_url, get_avatar_url
from zerver.lib.response import json_error, json_success
from zerver.lib.upload import upload_avatar_image
from zerver.lib.validator import check_bool, check_string
from zerver.models import UserProfile, Stream, Realm, get_user_profile_by_email, \
    get_stream, email_allowed_for_realm

from six import text_type
from typing import Optional, Dict, Any

def deactivate_user_backend(request, user_profile, email):
    # type: (HttpRequest, UserProfile, text_type) -> HttpResponse
    try:
        target = get_user_profile_by_email(email)
    except UserProfile.DoesNotExist:
        return json_error(_('No such user'))
    if target.is_bot:
        return json_error(_('No such user'))
    return _deactivate_user_profile_backend(request, user_profile, target)

def deactivate_bot_backend(request, user_profile, email):
    # type: (HttpRequest, UserProfile, text_type) -> HttpResponse
    try:
        target = get_user_profile_by_email(email)
    except UserProfile.DoesNotExist:
        return json_error(_('No such bot'))
    if not target.is_bot:
        return json_error(_('No such bot'))
    return _deactivate_user_profile_backend(request, user_profile, target)

def _deactivate_user_profile_backend(request, user_profile, target):
    # type: (HttpRequest, UserProfile, UserProfile) -> HttpResponse
    if not user_profile.can_admin_user(target):
        return json_error(_('Insufficient permission'))

    do_deactivate_user(target)
    return json_success({})

def reactivate_user_backend(request, user_profile, email):
    # type: (HttpRequest, UserProfile, text_type) -> HttpResponse
    try:
        target = get_user_profile_by_email(email)
    except UserProfile.DoesNotExist:
        return json_error(_('No such user'))

    if not user_profile.can_admin_user(target):
        return json_error(_('Insufficient permission'))

    do_reactivate_user(target)
    return json_success({})

@has_request_variables
def update_user_backend(request, user_profile, email,
                        full_name=REQ(default="", validator=check_string),
                        is_admin=REQ(default=None, validator=check_bool)):
    # type: (HttpRequest, UserProfile, text_type, Optional[text_type], Optional[bool]) -> HttpResponse
    try:
        target = get_user_profile_by_email(email)
    except UserProfile.DoesNotExist:
        return json_error(_('No such user'))

    if not user_profile.can_admin_user(target):
        return json_error(_('Insufficient permission'))

    if is_admin is not None:
        do_change_is_admin(target, is_admin)

    if (full_name is not None and target.full_name != full_name and
            full_name.strip() != ""):
        # We don't respect `name_changes_disabled` here because the request
        # is on behalf of the administrator.
        new_full_name = full_name.strip()
        if len(new_full_name) > UserProfile.MAX_NAME_LENGTH:
            return json_error(_("Name too long!"))
        do_change_full_name(target, new_full_name)

    return json_success({})

def avatar(request, email):
    # type: (HttpRequest, str) -> HttpResponse
    try:
        user_profile = get_user_profile_by_email(email)
        avatar_source = user_profile.avatar_source
    except UserProfile.DoesNotExist:
        avatar_source = 'G'
    url = get_avatar_url(avatar_source, email)

    # We can rely on the url already having query parameters. Because
    # our templates depend on being able to use the ampersand to
    # add query parameters to our url, get_avatar_url does '?x=x'
    # hacks to prevent us from having to jump through decode/encode hoops.
    assert '?' in url
    url += '&' + request.META['QUERY_STRING']
    return redirect(url)

def get_stream_name(stream):
    # type: (Stream) -> Optional[text_type]
    if stream:
        name = stream.name
    else :
        name = None
    return name

def stream_or_none(stream_name, realm):
    # type: (text_type, Realm) -> Optional[Stream]
    if stream_name == '':
        return None
    else:
        stream = get_stream(stream_name, realm)
        if not stream:
            raise JsonableError(_('No such stream \'%s\'') % (stream_name,))
        return stream

@has_request_variables
def patch_bot_backend(request, user_profile, email,
                      full_name=REQ(default=None),
                      default_sending_stream=REQ(default=None),
                      default_events_register_stream=REQ(default=None),
                      default_all_public_streams=REQ(default=None, validator=check_bool)):
    # type: (HttpRequest, UserProfile, text_type, Optional[text_type], Optional[text_type], Optional[text_type], Optional[bool]) -> HttpResponse
    try:
        bot = get_user_profile_by_email(email)
    except:
        return json_error(_('No such user'))

    if not user_profile.can_admin_user(bot):
        return json_error(_('Insufficient permission'))

    if full_name is not None:
        do_change_full_name(bot, full_name)
    if default_sending_stream is not None:
        stream = stream_or_none(default_sending_stream, bot.realm)
        do_change_default_sending_stream(bot, stream)
    if default_events_register_stream is not None:
        stream = stream_or_none(default_events_register_stream, bot.realm)
        do_change_default_events_register_stream(bot, stream)
    if default_all_public_streams is not None:
        do_change_default_all_public_streams(bot, default_all_public_streams)

    if len(request.FILES) == 0:
        pass
    elif len(request.FILES) == 1:
        user_file = list(request.FILES.values())[0]
        upload_avatar_image(user_file, user_profile, bot.email)
        avatar_source = UserProfile.AVATAR_FROM_USER
        do_change_avatar_source(bot, avatar_source)
    else:
        return json_error(_("You may only upload one file at a time"))

    json_result = dict(
        full_name=bot.full_name,
        avatar_url=avatar_url(bot),
        default_sending_stream=get_stream_name(bot.default_sending_stream),
        default_events_register_stream=get_stream_name(bot.default_events_register_stream),
        default_all_public_streams=bot.default_all_public_streams,
    )
    return json_success(json_result)

@has_request_variables
def regenerate_bot_api_key(request, user_profile, email):
    # type: (HttpRequest, UserProfile, text_type) -> HttpResponse
    try:
        bot = get_user_profile_by_email(email)
    except:
        return json_error(_('No such user'))

    if not user_profile.can_admin_user(bot):
        return json_error(_('Insufficient permission'))

    do_regenerate_api_key(bot)
    json_result = dict(
        api_key = bot.api_key
    )
    return json_success(json_result)

@has_request_variables
def add_bot_backend(request, user_profile, full_name=REQ(), short_name=REQ(),
                    default_sending_stream_name=REQ('default_sending_stream', default=None),
                    default_events_register_stream_name=REQ('default_events_register_stream', default=None),
                    default_all_public_streams=REQ(validator=check_bool, default=None)):
    # type: (HttpRequest, UserProfile, text_type, text_type, Optional[text_type], Optional[text_type], Optional[bool]) -> HttpResponse
    short_name += "-bot"
    email = short_name + "@" + user_profile.realm.domain
    form = CreateUserForm({'full_name': full_name, 'email': email})
    if not form.is_valid():
        # We validate client-side as well
        return json_error(_('Bad name or username'))

    try:
        get_user_profile_by_email(email)
        return json_error(_("Username already in use"))
    except UserProfile.DoesNotExist:
        pass

    if len(request.FILES) == 0:
        avatar_source = UserProfile.AVATAR_FROM_GRAVATAR
    elif len(request.FILES) != 1:
        return json_error(_("You may only upload one file at a time"))
    else:
        user_file = list(request.FILES.values())[0]
        upload_avatar_image(user_file, user_profile, email)
        avatar_source = UserProfile.AVATAR_FROM_USER

    default_sending_stream = None
    if default_sending_stream_name is not None:
        default_sending_stream = stream_or_none(default_sending_stream_name, user_profile.realm)
    if default_sending_stream and not default_sending_stream.is_public() and not \
        subscribed_to_stream(user_profile, default_sending_stream):
        return json_error(_('Insufficient permission'))

    default_events_register_stream = None
    if default_events_register_stream_name is not None:
        default_events_register_stream = stream_or_none(default_events_register_stream_name,
                                                        user_profile.realm)
    if default_events_register_stream and not default_events_register_stream.is_public() and not \
        subscribed_to_stream(user_profile, default_events_register_stream):
        return json_error(_('Insufficient permission'))


    bot_profile = do_create_user(email=email, password='',
                                 realm=user_profile.realm, full_name=full_name,
                                 short_name=short_name, active=True,
                                 bot_type=UserProfile.DEFAULT_BOT,
                                 bot_owner=user_profile,
                                 avatar_source=avatar_source,
                                 default_sending_stream=default_sending_stream,
                                 default_events_register_stream=default_events_register_stream,
                                 default_all_public_streams=default_all_public_streams)
    json_result = dict(
            api_key=bot_profile.api_key,
            avatar_url=avatar_url(bot_profile),
            default_sending_stream=get_stream_name(bot_profile.default_sending_stream),
            default_events_register_stream=get_stream_name(bot_profile.default_events_register_stream),
            default_all_public_streams=bot_profile.default_all_public_streams,
    )
    return json_success(json_result)

def get_bots_backend(request, user_profile):
    # type: (HttpRequest, UserProfile) -> HttpResponse
    bot_profiles = UserProfile.objects.filter(is_bot=True, is_active=True,
                                              bot_owner=user_profile)
    bot_profiles = bot_profiles.select_related('default_sending_stream', 'default_events_register_stream')
    bot_profiles = bot_profiles.order_by('date_joined')

    def bot_info(bot_profile):
        # type: (UserProfile) -> Dict[str, Any]
        default_sending_stream = get_stream_name(bot_profile.default_sending_stream)
        default_events_register_stream = get_stream_name(bot_profile.default_events_register_stream)

        return dict(
            username=bot_profile.email,
            full_name=bot_profile.full_name,
            api_key=bot_profile.api_key,
            avatar_url=avatar_url(bot_profile),
            default_sending_stream=default_sending_stream,
            default_events_register_stream=default_events_register_stream,
            default_all_public_streams=bot_profile.default_all_public_streams,
        )

    return json_success({'bots': list(map(bot_info, bot_profiles))})

def get_members_backend(request, user_profile):
    # type: (HttpRequest, UserProfile) -> HttpResponse
    realm = user_profile.realm
    admins = set(user_profile.realm.get_admin_users())
    members = []
    for profile in UserProfile.objects.select_related().filter(realm=realm):
        avatar_url = get_avatar_url(
            profile.avatar_source,
            profile.email
        )
        member = {"full_name": profile.full_name,
                  "is_bot": profile.is_bot,
                  "is_active": profile.is_active,
                  "is_admin": (profile in admins),
                  "email": profile.email,
                  "avatar_url": avatar_url,}
        if profile.is_bot and profile.bot_owner is not None:
            member["bot_owner"] = profile.bot_owner.email
        members.append(member)
    return json_success({'members': members})

@require_realm_admin
@has_request_variables
def create_user_backend(request, user_profile, email=REQ(), password=REQ(),
                        full_name=REQ(), short_name=REQ()):
    # type: (HttpRequest, UserProfile, text_type, text_type, text_type, text_type) -> HttpResponse
    form = CreateUserForm({'full_name': full_name, 'email': email})
    if not form.is_valid():
        return json_error(_('Bad name or username'))

    # Check that the new user's email address belongs to the admin's realm
    # (Since this is an admin API, we don't require the user to have been
    # invited first.)
    realm = user_profile.realm
    if not email_allowed_for_realm(email, user_profile.realm):
        return json_error(_("Email '%(email)s' does not belong to domain '%(domain)s'") %
                          {'email': email, 'domain': realm.domain})

    try:
        get_user_profile_by_email(email)
        return json_error(_("Email '%s' already in use") % (email,))
    except UserProfile.DoesNotExist:
        pass

    do_create_user(email, password, realm, full_name, short_name)
    return json_success()
