#!/opt/imunify360/venv/bin/python3
"""This module import peewee_migrate and apply migrations, for Imunify-AV
it's entrypoint for service"""

import os
import sys
from logging import getLogger

from peewee_migrate import migrator

import defence360agent.internals.logger
from defence360agent.application import app
from defence360agent.application.settings import configure
from defence360agent.contracts.config import Core
from defence360agent.contracts.config import Model
from defence360agent.contracts.config import bool_from_envvar
from defence360agent.router import Router
from defence360agent.subsys import systemd_notifier
from defence360agent.model.instance import db
from defence360agent.model import tls_check

logger = getLogger(__name__)

GO_SERVICE_NAME = "/usr/bin/imunify-resident"


def is_go_supported(start_pkg):
    """Check if go service is supported"""
    # not supported in antivirus mode
    if start_pkg != "im360.run_resident":
        return False
    return True


def apply_migrations(migrations_dirs, attached_dbs=tuple()):
    """Apply migrations: restructure db, config files, etc."""

    logger.info("Applying database migrations...")
    systemd_notifier.notify(systemd_notifier.AgentState.MIGRATING)

    # prepare database to operate in WAL journal_mode and run migrations
    tls_check.reset()
    db.init(Model.PATH)
    for db_path, schema_name in attached_dbs:
        db.execute_sql(f"ATTACH '{db_path}' AS {schema_name}")
    try:
        with db.atomic("EXCLUSIVE"):
            router = Router(
                db,
                migrations_dirs=migrations_dirs,
                logger=logger,
            )
            # HACK: Migrator uses global unconfigurable LOGGER,
            # overrride it, to use our logging settings
            migrator.LOGGER = logger
            router.run()
    finally:
        # close connection immediately since later this process
        # will be replaced by execv
        db.close()


def run(*, start_pkg="defence360agent", configure=configure):
    """Entry point for Imunify-AV service. Apply migrations,
    and then replace process with {start_pkg}.run module."""
    os.umask(Core.FILE_UMASK)
    configure()
    defence360agent.internals.logger.reconfigure()
    systemd_notifier.notify(systemd_notifier.AgentState.READY)
    apply_migrations(app.MIGRATIONS_DIRS, app.MIGRATIONS_ATTACHED_DBS)
    logger.info("Starting main process...")
    systemd_notifier.notify(systemd_notifier.AgentState.STARTING)

    use_go = bool_from_envvar(
        "I360_USE_GO", default=is_go_supported(start_pkg)
    )

    if use_go:
        Core.GO_FLAG_FILE.touch(exist_ok=True)
        logger.info("Run imunify-resident service")
        os.execv(
            GO_SERVICE_NAME,
            [
                GO_SERVICE_NAME,
            ]
            + sys.argv[1:],
        )
    else:
        Core.GO_FLAG_FILE.unlink(missing_ok=True)
        os.execv(
            sys.executable,
            [sys.executable, "-m", "{}".format(start_pkg)] + sys.argv[1:],
        )


if __name__ == "__main__":
    run()