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

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


def _install_doveauth() -> None:
    """Setup chatctl."""
    doveauth_filename = "doveauth-0.1.tar.gz"
    doveauth_path = importlib.resources.files(__package__).joinpath(
        f"../../../doveauth/dist/{doveauth_filename}"
    )
    remote_path = f"/tmp/{doveauth_filename}"
    if Path(str(doveauth_path)).exists():
        files.put(
            name="upload local doveauth build",
            src=doveauth_path.open("rb"),
            dest=remote_path,
        )
        # Maybe if we introduce dependencies to the doveauth package at some point, we should not install doveauth
        # system-wide anymore. For now it's fine though.
        server.shell(
            name="install local doveauth build with pip",
            commands=[f"pip install --break-system-packages {remote_path}"],
        )


def _install_filtermail() -> None:
    """Setup filtermail."""
    filtermail_filename = "filtermail-0.1.tar.gz"
    filtermail_path = importlib.resources.files(__package__).joinpath(
        f"../../../filtermail/dist/{filtermail_filename}"
    )
    remote_path = f"/tmp/{filtermail_filename}"
    if Path(str(filtermail_path)).exists():
        files.put(
            name="upload local filtermail build",
            src=filtermail_path.open("rb"),
            dest=remote_path,
        )
        apt.packages(
            name="apt install python3-aiosmtpd",
            packages="python3-aiosmtpd",
        )

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

        files.put(
            src=importlib.resources.files(__package__)
            .joinpath("../../../filtermail/filtermail.service")
            .open("rb"),
            dest="/etc/systemd/system/filtermail.service",
            user="root",
            group="root",
            mode="644",
        )
        systemd.service(
            name="Setup filtermail service",
            service="filtermail.service",
            running=True,
            enabled=True,
            restarted=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},
    )

    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",
        )

    need_restart |= main_config.changed

    return need_restart


def _configure_postfix(domain: str) -> 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.put(
        src=importlib.resources.files(__package__)
        .joinpath("postfix/master.cf")
        .open("rb"),
        dest="/etc/postfix/master.cf",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= master_config.changed

    return need_restart


def _configure_dovecot(mail_server: str) -> 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},
    )
    need_restart |= main_config.changed

    # luarocks install http lpeg_patterns fifo
    auth_script = files.put(
        src=importlib.resources.files("doveauth").joinpath("doveauth.lua"),
        dest="/etc/dovecot/doveauth.lua",
        user="root",
        group="root",
        mode="644",
    )
    need_restart |= auth_script.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")
    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(domains=[mail_server])

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

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

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

    apt.packages(
        name="apt install python3-pip",
        packages="python3-pip",
    )
    _install_doveauth()
    _install_filtermail()
    dovecot_need_restart = _configure_dovecot(mail_server)
    postfix_need_restart = _configure_postfix(mail_domain)
    opendkim_need_restart = _configure_opendkim(mail_domain, dkim_selector)

    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,
    )

    def callback():
        result = server.shell(
            commands=[
                f"""sed 's/\tIN/ 600 IN/;s/\t(//;s/\"$//;s/^\t  \"//g; s/ ).*//' """
                f"""/etc/dkimkeys/{dkim_selector}.txt | tr --delete '\n'"""
            ]
        )
        logger.info(f"Add this TXT entry into DNS zone: {result.stdout}")

    python.call(name="Print TXT entry for DKIM", function=callback)