"""Automated deployment with Fabric.

To deploy to production:

  python3 -m pip install --user vps-deploy
  export FABRIC_HOSTS=user@hostname
  fab deploy
"""

import os

from fabric import task  # type: ignore
from invoke.collection import Collection  # type: ignore
from patchwork.files import exists
from vps_deploy import django_fabric2 as df2  # type: ignore

hosts = os.environ['FABRIC_HOSTS'].split(',')


def install_essentials(c):
    # ImageMagick (convert) and Inkscape required for generating badges.
    c.run('sudo apt-get install -yy git python3-dev python3-venv python3-wheel build-essential python3-cairocffi python3-psycopg2 postgresql uwsgi-emperor uwsgi-plugin-python3 memcached netcat nginx certbot libmemcached-dev xmlsec1 imagemagick inkscape')


@task(hosts=hosts)
def deploy(c):
    install_essentials(c)
    df2.transfer_files_git(c)
    df2.init(c)
    if not exists(c, c.env.virtualenv):
        c.sudo(f'mkdir -p $(dirname {c.env.virtualenv})')
        c.sudo(f'chown {c.user} $(dirname {c.env.virtualenv})')
        c.run('{env.python} -m venv --system-site-packages {env.virtualenv}'.format(env=c.env))
    with c.cd(c.env.project_dir):
        c.run('{env.virtualenv}/bin/python -m pip install -c constraints.txt -r requirements.txt'.format(env=c.env))
        # Fixes "AttributeError: install_layout". See:
        # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1003252
        # https://github.com/pypa/setuptools/issues/3278
        c.run('SETUPTOOLS_USE_DISTUTILS=stdlib {env.virtualenv}/bin/python -m pip install -c constraints.txt -r vendored_requirements.txt'.format(env=c.env))
    df2.prepare_django(c, fail_level='ERROR')
    df2.fix_permissions(
        c,
        read=['pinaxcon', 'vendor', 'static'],
        read_write=[],
    )
    df2.reload_uwsgi(c)
    df2.flush_memcached(c)
    df2.update_nginx(c)
    df2.install_scheduled_jobs(
        c,
        periodic_jobs=[
            'deploy/cron/cron.daily',
        ],
    )
    df2.check_site_online(c)


# The "ns" appears to be a magic name.
ns = Collection(
    deploy,
    task(df2.download_postgres_db, hosts=hosts),
    task(df2.mirror_postgres_db, hosts=hosts),
    task(df2.mirror_media, hosts=hosts),
    task(df2.django_shell, hosts=hosts),
    task(df2.bash, hosts=hosts),
)
ns.configure({
    # Built-in Fabric config.
    'run': {
        'echo': True,
        # Needed so local commands work. Can also use FABRIC_RUN_REPLACE_ENV.
        'replace_env': False,
    },

    # Our custom project config.
    'env': {
        'branch': 'fossy2023',
        'app_user': 'www-data',
        'db_name': 'symposion',
        'project_dir': '/srv/symposion_app',
        'media_dir': 'media',
        'virtualenv': '/srv/venvs/symposion-django-py39',
        'site_name': 'symposion',
        'requirements': 'requirements.txt',
        'settings': 'pinaxcon.settings',
        'uwsgi_conf': 'deploy/uwsgi.ini',
        'nginx_conf': 'deploy/nginx.conf',
        'python': '/usr/bin/python3.9',
        'url': 'https://2023.fossy.us/',
        'domain': '2023.fossy.us',
    },
})