from datetime import datetime, timedelta
from time import sleep

from flask import request, flash, json, url_for, current_app, redirect
from flask_login import login_required, current_user
from flask_babel import _
from sqlalchemy import text, desc

from app import db, celery
from app.activitypub.routes import process_inbox_request, process_delete_request
from app.activitypub.signature import post_request
from app.activitypub.util import default_context
from app.admin.forms import FederationForm, SiteMiscForm, SiteProfileForm, EditCommunityForm, EditUserForm
from app.community.util import save_icon_file, save_banner_file
from app.models import AllowedInstances, BannedInstances, ActivityPubLog, utcnow, Site, Community, CommunityMember, \
    User, Instance, File
from app.utils import render_template, permission_required, set_setting, get_setting, gibberish, markdown_to_html
from app.admin import bp


@bp.route('/', methods=['GET', 'POST'])
@login_required
@permission_required('change instance settings')
def admin_home():
    return render_template('admin/home.html', title=_('Admin'))


@bp.route('/site', methods=['GET', 'POST'])
@login_required
@permission_required('change instance settings')
def admin_site():
    form = SiteProfileForm()
    site = Site.query.get(1)
    if site is None:
        site = Site()
    if form.validate_on_submit():
        site.name = form.name.data
        site.description = form.description.data
        site.sidebar = form.sidebar.data
        site.legal_information = form.legal_information.data
        site.updated = utcnow()
        if site.id is None:
            db.session.add(site)
        db.session.commit()
        flash('Settings saved.')
    elif request.method == 'GET':
        form.name.data = site.name
        form.description.data = site.description
        form.sidebar.data = site.sidebar
        form.legal_information.data = site.legal_information
    return render_template('admin/site.html', title=_('Site profile'), form=form)


@bp.route('/misc', methods=['GET', 'POST'])
@login_required
@permission_required('change instance settings')
def admin_misc():
    form = SiteMiscForm()
    site = Site.query.get(1)
    if site is None:
        site = Site()
    if form.validate_on_submit():
        site.enable_downvotes = form.enable_downvotes.data
        site.allow_local_image_posts = form.allow_local_image_posts.data
        site.remote_image_cache_days = form.remote_image_cache_days.data
        site.enable_nsfw = form.enable_nsfw.data
        site.enable_nsfl = form.enable_nsfl.data
        site.community_creation_admin_only = form.community_creation_admin_only.data
        site.reports_email_admins = form.reports_email_admins.data
        site.registration_mode = form.registration_mode.data
        site.application_question = form.application_question.data
        site.updated = utcnow()
        if site.id is None:
            db.session.add(site)
        db.session.commit()
        flash('Settings saved.')
    elif request.method == 'GET':
        form.enable_downvotes.data = site.enable_downvotes
        form.allow_local_image_posts.data = site.allow_local_image_posts
        form.remote_image_cache_days.data = site.remote_image_cache_days
        form.enable_nsfw.data = site.enable_nsfw
        form.enable_nsfl.data = site.enable_nsfl
        form.community_creation_admin_only.data = site.community_creation_admin_only
        form.reports_email_admins.data = site.reports_email_admins
        form.registration_mode.data = site.registration_mode
        form.application_question.data = site.application_question
    return render_template('admin/misc.html', title=_('Misc settings'), form=form)


@bp.route('/federation', methods=['GET', 'POST'])
@login_required
@permission_required('change instance settings')
def admin_federation():
    form = FederationForm()
    site = Site.query.get(1)
    if site is None:
        site = Site()
    # todo: finish form
    site.updated = utcnow()
    if form.validate_on_submit():
        if form.use_allowlist.data:
            set_setting('use_allowlist', True)
            db.session.execute(text('DELETE FROM allowed_instances'))
            for allow in form.allowlist.data.split('\n'):
                if allow.strip():
                    db.session.add(AllowedInstances(domain=allow.strip()))
        if form.use_blocklist.data:
            set_setting('use_allowlist', False)
            db.session.execute(text('DELETE FROM banned_instances'))
            for banned in form.blocklist.data.split('\n'):
                if banned.strip():
                    db.session.add(BannedInstances(domain=banned.strip()))
        db.session.commit()
        flash(_('Admin settings saved'))

    elif request.method == 'GET':
        form.use_allowlist.data = get_setting('use_allowlist', False)
        form.use_blocklist.data = not form.use_allowlist.data
        instances = BannedInstances.query.all()
        form.blocklist.data = '\n'.join([instance.domain for instance in instances])
        instances = AllowedInstances.query.all()
        form.allowlist.data = '\n'.join([instance.domain for instance in instances])

    return render_template('admin/federation.html', title=_('Federation settings'), form=form)


@bp.route('/activities', methods=['GET'])
@login_required
@permission_required('change instance settings')
def admin_activities():
    db.session.query(ActivityPubLog).filter(
        ActivityPubLog.created_at < utcnow() - timedelta(days=3)).delete()
    db.session.commit()

    page = request.args.get('page', 1, type=int)

    activities = ActivityPubLog.query.order_by(desc(ActivityPubLog.created_at)).paginate(page=page, per_page=1000, error_out=False)

    next_url = url_for('admin.admin_activities', page=activities.next_num) if activities.has_next else None
    prev_url = url_for('admin.admin_activities', page=activities.prev_num) if activities.has_prev and page != 1 else None

    return render_template('admin/activities.html', title=_('ActivityPub Log'), next_url=next_url, prev_url=prev_url,
                           activities=activities)


@bp.route('/activity_json/<int:activity_id>')
@login_required
@permission_required('change instance settings')
def activity_json(activity_id):
    activity = ActivityPubLog.query.get_or_404(activity_id)
    return render_template('admin/activity_json.html', title=_('Activity JSON'),
                           activity_json_data=json.loads(activity.activity_json), activity=activity, current_app=current_app)


@bp.route('/activity_json/<int:activity_id>/replay')
@login_required
@permission_required('change instance settings')
def activity_replay(activity_id):
    activity = ActivityPubLog.query.get_or_404(activity_id)
    request_json = json.loads(activity.activity_json)
    if 'type' in request_json and request_json['type'] == 'Delete' and request_json['id'].endswith('#delete'):
        process_delete_request(request_json, activity.id, None)
    else:
        process_inbox_request(request_json, activity.id, None)
    return 'Ok'


@bp.route('/communities', methods=['GET'])
@login_required
@permission_required('administer all communities')
def admin_communities():

    page = request.args.get('page', 1, type=int)

    communities = Community.query.filter_by(banned=False).order_by(Community.title).paginate(page=page, per_page=1000, error_out=False)

    next_url = url_for('admin.admin_communities', page=communities.next_num) if communities.has_next else None
    prev_url = url_for('admin.admin_communities', page=communities.prev_num) if communities.has_prev and page != 1 else None

    return render_template('admin/communities.html', title=_('Communities'), next_url=next_url, prev_url=prev_url,
                           communities=communities)


@bp.route('/community/<int:community_id>/edit', methods=['GET', 'POST'])
@login_required
@permission_required('administer all communities')
def admin_community_edit(community_id):
    form = EditCommunityForm()
    community = Community.query.get_or_404(community_id)
    if form.validate_on_submit():
        community.name = form.url.data
        community.title = form.title.data
        community.description = form.description.data
        community.rules = form.rules.data
        community.nsfw = form.nsfw.data
        community.show_home = form.show_home.data
        community.show_popular = form.show_popular.data
        community.show_all = form.show_all.data
        community.low_quality = form.low_quality.data
        community.content_retention = form.content_retention.data
        icon_file = request.files['icon_file']
        if icon_file and icon_file.filename != '':
            if community.icon_id:
                community.icon.delete_from_disk()
            file = save_icon_file(icon_file)
            if file:
                community.icon = file
        banner_file = request.files['banner_file']
        if banner_file and banner_file.filename != '':
            if community.image_id:
                community.image.delete_from_disk()
            file = save_banner_file(banner_file)
            if file:
                community.image = file
        db.session.commit()
        flash(_('Saved'))
        return redirect(url_for('admin.admin_communities'))
    else:
        if not community.is_local():
            flash(_('This is a remote community - most settings here will be regularly overwritten with data from the original server.'), 'warning')
        form.url.data = community.name
        form.title.data = community.title
        form.description.data = community.description
        form.rules.data = community.rules
        form.nsfw.data = community.nsfw
        form.show_home.data = community.show_home
        form.show_popular.data = community.show_popular
        form.show_all.data = community.show_all
        form.low_quality.data = community.low_quality
        form.content_retention.data = community.content_retention
    return render_template('admin/edit_community.html', title=_('Edit community'), form=form, community=community)


@bp.route('/community/<int:community_id>/delete', methods=['GET'])
@login_required
@permission_required('administer all communities')
def admin_community_delete(community_id):
    community = Community.query.get_or_404(community_id)

    community.banned = True  # Unsubscribing everyone could take a long time so until that is completed hide this community from the UI by banning it.
    community.last_active = utcnow()
    db.session.commit()

    unsubscribe_everyone_then_delete(community.id)

    flash(_('Community deleted'))
    return redirect(url_for('admin.admin_communities'))


def unsubscribe_everyone_then_delete(community_id):
    if current_app.debug:
        unsubscribe_everyone_then_delete_task(community_id)
    else:
        unsubscribe_everyone_then_delete_task.delay(community_id)


@celery.task
def unsubscribe_everyone_then_delete_task(community_id):
    community = Community.query.get_or_404(community_id)
    if not community.is_local():
        members = CommunityMember.query.filter_by(community_id=community_id).all()
        for member in members:
            user = User.query.get(member.user_id)
            unsubscribe_from_community(community, user)
    else:
        # todo: federate delete of local community out to all following instances
        ...

    sleep(5)
    community.delete_dependencies()
    db.session.delete(community)    # todo: when a remote community is deleted it will be able to be re-created by using the 'Add remote' function. Not ideal. Consider soft-delete.


@bp.route('/users', methods=['GET'])
@login_required
@permission_required('administer all users')
def admin_users():

    page = request.args.get('page', 1, type=int)

    users = User.query.filter_by(deleted=False).order_by(User.user_name).paginate(page=page, per_page=1000, error_out=False)

    next_url = url_for('admin.admin_users', page=users.next_num) if users.has_next else None
    prev_url = url_for('admin.admin_users', page=users.prev_num) if users.has_prev and page != 1 else None

    return render_template('admin/users.html', title=_('Users'), next_url=next_url, prev_url=prev_url, users=users)


@bp.route('/user/<int:user_id>/edit', methods=['GET', 'POST'])
@login_required
@permission_required('administer all users')
def admin_user_edit(user_id):
    form = EditUserForm()
    user = User.query.get_or_404(user_id)
    if form.validate_on_submit():
        user.about = form.about.data
        user.about_html = markdown_to_html(form.about.data)
        user.matrix_user_id = form.matrix_user_id.data
        user.bot = form.bot.data
        profile_file = request.files['profile_file']
        if profile_file and profile_file.filename != '':
            # remove old avatar
            file = File.query.get(user.avatar_id)
            file.delete_from_disk()
            user.avatar_id = None
            db.session.delete(file)

            # add new avatar
            file = save_icon_file(profile_file, 'users')
            if file:
                user.avatar = file
        banner_file = request.files['banner_file']
        if banner_file and banner_file.filename != '':
            # remove old cover
            file = File.query.get(user.cover_id)
            file.delete_from_disk()
            user.cover_id = None
            db.session.delete(file)

            # add new cover
            file = save_banner_file(banner_file, 'users')
            if file:
                user.cover = file
        user.newsletter = form.newsletter.data
        user.ignore_bots = form.ignore_bots.data
        user.show_nsfw = form.nsfw.data
        user.show_nsfl = form.nsfl.data
        user.searchable = form.searchable.data
        user.indexable = form.indexable.data
        user.ap_manually_approves_followers = form.manually_approves_followers.data
        db.session.commit()
        user.flush_cache()
        flash(_('Saved'))
        return redirect(url_for('admin.admin_users'))
    else:
        if not user.is_local():
            flash(_('This is a remote user - most settings here will be regularly overwritten with data from the original server.'), 'warning')
        form.about.data = user.about
        form.matrix_user_id.data = user.matrix_user_id
        form.newsletter.data = user.newsletter
        form.bot.data = user.bot
        form.ignore_bots.data = user.ignore_bots
        form.nsfw.data = user.show_nsfw
        form.nsfl.data = user.show_nsfl
        form.searchable.data = user.searchable
        form.indexable.data = user.indexable
        form.manually_approves_followers.data = user.ap_manually_approves_followers

    return render_template('admin/edit_user.html', title=_('Edit user'), form=form, user=user)


@bp.route('/user/<int:user_id>/delete', methods=['GET'])
@login_required
@permission_required('administer all users')
def admin_user_delete(user_id):
    user = User.query.get_or_404(user_id)

    user.banned = True  # Unsubscribing everyone could take a long time so until that is completed hide this user from the UI by banning it.
    user.last_active = utcnow()
    db.session.commit()

    if user.is_local():
        unsubscribe_from_everything_then_delete(user.id)
    else:
        user.deleted = True
        user.delete_dependencies()
        db.session.commit()

    flash(_('User deleted'))
    return redirect(url_for('admin.admin_users'))


def unsubscribe_from_everything_then_delete(user_id):
    if current_app.debug:
        unsubscribe_from_everything_then_delete_task(user_id)
    else:
        unsubscribe_from_everything_then_delete_task.delay(user_id)


@celery.task
def unsubscribe_from_everything_then_delete_task(user_id):
    user = User.query.get(user_id)
    if user:

        # unsubscribe
        communities = CommunityMember.query.filter_by(user_id=user_id).all()
        for membership in communities:
            community = Community.query.get(membership.community_id)
            unsubscribe_from_community(community, user)

        # federate deletion of account
        if user.is_local():
            instances = Instance.query.all()
            site = Site.query.get(1)
            payload = {
                "@context": default_context(),
                "actor": user.ap_profile_id,
                "id": f"{user.ap_profile_id}#delete",
                "object": user.ap_profile_id,
                "to": [
                    "https://www.w3.org/ns/activitystreams#Public"
                ],
                "type": "Delete"
            }
            for instance in instances:
                if instance.inbox and instance.id != 1:
                    post_request(instance.inbox, payload, site.private_key,
                                 f"https://{current_app.config['SERVER_NAME']}#main-key")

        user.deleted = True
        user.delete_dependencies()
        db.session.commit()


def unsubscribe_from_community(community, user):
    undo_id = f"https://{current_app.config['SERVER_NAME']}/activities/undo/" + gibberish(15)
    follow = {
        "actor": f"https://{current_app.config['SERVER_NAME']}/u/{user.user_name}",
        "to": [community.ap_profile_id],
        "object": community.ap_profile_id,
        "type": "Follow",
        "id": f"https://{current_app.config['SERVER_NAME']}/activities/follow/{gibberish(15)}"
    }
    undo = {
        'actor': user.profile_id(),
        'to': [community.ap_profile_id],
        'type': 'Undo',
        'id': undo_id,
        'object': follow
    }
    activity = ActivityPubLog(direction='out', activity_id=undo_id, activity_type='Undo',
                              activity_json=json.dumps(undo), result='processing')
    db.session.add(activity)
    db.session.commit()
    post_request(community.ap_inbox_url, undo, user.private_key, user.profile_id() + '#main-key')
    activity.result = 'success'
    db.session.commit()