"""
Chat Mail pyinfra deploy.
"""
import importlib.resources
from pathlib import Path

from pyinfra import host
from pyinfra.operations import apt, files, server, systemd
from pyinfra.facts.files import File
from .acmetool import deploy_acmetool


def _install_chatmaild() -> None:
    chatmaild_filename = "chatmaild-0.1.tar.gz"
    chatmaild_path = importlib.resources.files(__package__).joinpath(
        f"../../../dist/{chatmaild_filename}"
    )
    remote_path = f"/tmp/{chatmaild_filename}"
    if Path(str(chatmaild_path)).exists():
        files.put(
            name="Upload chatmaild source package",
            src=chatmaild_path.open("rb"),
            dest=remote_path,
        )

        apt.packages(
            name="apt install python3-aiosmtpd",
            packages=["python3-aiosmtpd", "python3-pip"],
        )

        # --no-deps because aiosmtplib is installed with `apt`.
        server.shell(
            name="install chatmaild with pip",
            commands=[f"pip install --break-system-packages {remote_path}"],
        )

        for fn in (
            "doveauth-dictproxy",
            "filtermail",
        ):
            files.put(
                name=f"Upload {fn}.service",
                src=importlib.resources.files("chatmaild")
                .joinpath(f"{fn}.service")
                .open("rb"),
                dest=f"/etc/systemd/system/{fn}.service",
                user="root",
                group="root",
                mode="644",
            )
            systemd.service(
                name=f"Setup {fn} service",
                service=f"{fn}.service",
                running=True,
                enabled=True,
                restarted=True,
                daemon_reload=True,
            )


def _configure_opendkim(domain: str, dkim_selector: str) -> bool:
    """Configures OpenDKIM"""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("opendkim/opendkim.conf"),
        dest="/etc/opendkim.conf",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": domain, "opendkim_selector": dkim_selector},
    )
    need_restart |= main_config.changed

    files.directory(
        name="Add opendkim directory to /etc",
        path="/etc/opendkim",
        user="opendkim",
        group="opendkim",
        mode="750",
        present=True,
    )

    keytable = files.template(
        src=importlib.resources.files(__package__).joinpath("opendkim/KeyTable"),
        dest="/etc/dkimkeys/KeyTable",
        user="opendkim",
        group="opendkim",
        mode="644",
        config={"domain_name": domain, "opendkim_selector": dkim_selector},
    )
    need_restart |= keytable.changed

    signing_table = files.template(
        src=importlib.resources.files(__package__).joinpath("opendkim/SigningTable"),
        dest="/etc/dkimkeys/SigningTable",
        user="opendkim",
        group="opendkim",
        mode="644",
        config={"domain_name": domain, "opendkim_selector": dkim_selector},
    )
    need_restart |= signing_table.changed

    files.directory(
        name="Add opendkim socket directory to /var/spool/postfix",
        path="/var/spool/postfix/opendkim",
        user="opendkim",
        group="opendkim",
        mode="750",
        present=True,
    )

    if not host.get_fact(File, f"/etc/dkimkeys/{dkim_selector}.private"):
        server.shell(
            name="Generate OpenDKIM domain keys",
            commands=[
                f"opendkim-genkey -D /etc/dkimkeys -d {domain} -s {dkim_selector}"
            ],
            _sudo=True,
            _sudo_user="opendkim",
        )

    return need_restart


def _configure_postfix(domain: str, debug: bool = False) -> bool:
    """Configures Postfix SMTP server."""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("postfix/main.cf.j2"),
        dest="/etc/postfix/main.cf",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": domain},
    )
    need_restart |= main_config.changed

    master_config = files.template(
        src=importlib.resources.files(__package__).joinpath("postfix/master.cf.j2"),
        dest="/etc/postfix/master.cf",
        user="root",
        group="root",
        mode="644",
        debug=debug,
    )
    need_restart |= master_config.changed

    return need_restart


def _configure_dovecot(mail_server: str, debug: bool = False) -> bool:
    """Configures Dovecot IMAP server."""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("dovecot/dovecot.conf.j2"),
        dest="/etc/dovecot/dovecot.conf",
        user="root",
        group="root",
        mode="644",
        config={"hostname": mail_server},
        debug=debug,
    )
    need_restart |= main_config.changed
    auth_config = files.put(
        src=importlib.resources.files(__package__).joinpath("dovecot/auth.conf"),
        dest="/etc/dovecot/auth.conf",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= auth_config.changed

    files.put(
        src=importlib.resources.files(__package__)
        .joinpath("dovecot/expunge.cron")
        .open("rb"),
        dest="/etc/cron.d/expunge",
        user="root",
        group="root",
        mode="644",
    )

    return need_restart


def _configure_nginx(domain: str, debug: bool = False) -> bool:
    """Configures nginx HTTP server."""
    need_restart = False

    main_config = files.template(
        src=importlib.resources.files(__package__).joinpath("nginx.conf.j2"),
        dest="/etc/nginx/nginx.conf",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": domain},
    )
    need_restart |= main_config.changed

    autoconfig = files.template(
        src=importlib.resources.files(__package__).joinpath("autoconfig.xml.j2"),
        dest="/var/www/html/.well-known/autoconfig/mail/config-v1.1.xml",
        user="root",
        group="root",
        mode="644",
        config={"domain_name": domain},
    )
    need_restart |= autoconfig.changed

    return need_restart


def deploy_chatmail(mail_domain: str, mail_server: str, dkim_selector: str) -> None:
    """Deploy a chat-mail instance.

    :param mail_domain: domain part of your future email addresses
    :param mail_server: the DNS name under which your mail server is reachable
    :param dkim_selector:
    """

    apt.update(name="apt update", cache_time=24 * 3600)
    server.group(name="Create vmail group", group="vmail", system=True)
    server.user(name="Create vmail user", user="vmail", group="vmail", system=True)

    server.group(name="Create opendkim group", group="opendkim", system=True)
    server.user(
        name="Add postfix user to opendkim group for socket access",
        user="postfix",
        groups=["opendkim"],
        system=True,
    )

    # Deploy acmetool to have TLS certificates.
    deploy_acmetool(nginx_hook=True, domains=[mail_server])

    apt.packages(
        name="Install Postfix",
        packages="postfix",
    )

    apt.packages(
        name="Install Dovecot",
        packages=["dovecot-imapd", "dovecot-lmtpd"],
    )

    apt.packages(
        name="Install OpenDKIM",
        packages=[
            "opendkim",
            "opendkim-tools",
        ],
    )

    apt.packages(
        name="Install nginx",
        packages=["nginx"],
    )

    _install_chatmaild()
    debug = False
    dovecot_need_restart = _configure_dovecot(mail_server, debug=debug)
    postfix_need_restart = _configure_postfix(mail_domain, debug=debug)
    opendkim_need_restart = _configure_opendkim(mail_domain, dkim_selector)
    nginx_need_restart = _configure_nginx(mail_domain)

    systemd.service(
        name="Start and enable OpenDKIM",
        service="opendkim.service",
        running=True,
        enabled=True,
        restarted=opendkim_need_restart,
    )

    systemd.service(
        name="Start and enable Postfix",
        service="postfix.service",
        running=True,
        enabled=True,
        restarted=postfix_need_restart,
    )

    systemd.service(
        name="Start and enable Dovecot",
        service="dovecot.service",
        running=True,
        enabled=True,
        restarted=dovecot_need_restart,
    )

    systemd.service(
        name="Start and enable nginx",
        service="nginx.service",
        running=True,
        enabled=True,
        restarted=nginx_need_restart,
    )

    # This file is used by auth proxy.
    # https://wiki.debian.org/EtcMailName
    server.shell(
        name="Setup /etc/mailname",
        commands=[f"echo {mail_domain} >/etc/mailname; chmod 644 /etc/mailname"],
    )

    journald_conf = files.put(
        name="Configure journald",
        src=importlib.resources.files(__package__).joinpath("journald.conf"),
        dest="/etc/systemd/journald.conf",
        user="root",
        group="root",
        mode="644",
    )
    systemd.service(
        name="Start and enable journald",
        service="systemd-journald.service",
        running=True,
        enabled=True,
        restarted=journald_conf,
    )