#!/usr/bin/env python3
# Copyright 2015-2021 Canonical, Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import argparse
import asyncio
import fcntl
import logging
import os
import subprocess
import sys

from subiquity.cmd.common import LOGDIR, setup_environment
from subiquitycore.log import setup_logger
from system_setup.cmd.server import make_server_args_parser


class ClickAction(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        namespace.scripts.append("c(" + repr(values) + ")")


def make_client_args_parser():
    # TODO WSL: update this. We have already done it on the past…
    parser = argparse.ArgumentParser(
        description="SUbiquity - Ubiquity for Servers", prog="subiquity"
    )
    try:
        ascii_default = os.ttyname(0) == "/dev/ttysclp0"
    except OSError:
        ascii_default = False
    parser.set_defaults(ascii=ascii_default)
    parser.add_argument(
        "--dry-run",
        action="store_true",
        dest="dry_run",
        help="menu-only, do not call installer function",
    )
    parser.add_argument("--socket")
    parser.add_argument("--answers")
    parser.add_argument("--server-pid")
    parser.add_argument("--autoinstall", action="store", dest="autoinstall")
    parser.add_argument(
        "--prefill",
        dest="prefill",
        help=(
            "Prefills UI models with data provided in"
            " a prefill.yaml file yet allowing overrides."
        ),
    )
    parser.add_argument(
        "--output-base",
        action="store",
        dest="output_base",
        default=".subiquity",
        help="in dryrun, control basedir of files",
    )
    return parser


AUTO_ANSWERS_FILE = "/subiquity_config/answers.yaml"


def main():
    setup_environment()
    # setup_environment sets $APPORT_DATA_DIR which must be set before
    # apport is imported, which is done by this import:
    from system_setup.client.client import SystemSetupClient

    parser = make_client_args_parser()
    args = sys.argv[1:]

    need_start_server = False
    server_args = []
    server_output_dir = "/var/log/installer"
    server_state_file = "/run/subiquity/server-state"
    opts, unknown = parser.parse_known_args(args)
    if "--dry-run" in args:
        server_state_file = opts.output_base + "/run/subiquity/server-state"
        if opts.socket is None:
            need_start_server = True
            server_output_dir = opts.output_base
            sock_path = os.path.join(server_output_dir, "socket")
            opts.socket = sock_path
            server_args = ["--dry-run", "--socket=" + sock_path] + unknown
            server_args += ["--output-base", opts.output_base]

    elif opts.socket is None:
        need_start_server = True
        opts.socket = "/run/subiquity/socket"

    if opts.prefill:
        server_args += ["--prefill=" + opts.prefill]

    if opts.autoinstall:
        server_args += ["--autoinstall=" + opts.autoinstall]

    os.makedirs(server_output_dir, exist_ok=True)
    server_stdout = open(os.path.join(server_output_dir, "server-stdout"), "w")
    server_stderr = open(os.path.join(server_output_dir, "server-stderr"), "w")

    if need_start_server:
        if os.path.exists(server_state_file):
            os.unlink(server_state_file)
        server_parser = make_server_args_parser()
        server_parser.parse_args(server_args)  # just to check
        server_cmd = [sys.executable, "-m", "system_setup.cmd.server"] + server_args
        server_proc = subprocess.Popen(
            server_cmd, stdout=server_stdout, stderr=server_stderr
        )
        opts.server_pid = str(server_proc.pid)
        print("running server pid {} with args: {}".format(server_proc.pid, server_cmd))
    elif opts.server_pid is not None:
        print("reconnecting to server pid {}".format(opts.server_pid))

    os.makedirs(os.path.basename(opts.socket), exist_ok=True)
    logdir = LOGDIR
    if opts.dry_run:
        logdir = opts.output_base
    logfiles = setup_logger(dir=logdir, base="systemsetup-client")

    logger = logging.getLogger("subiquity")
    version = "unknown"
    logger.info("Starting System Setup revision {}".format(version))
    logger.info("Arguments passed: {}".format(sys.argv))

    opts.ssh = False
    opts.screens = []
    opts.scripts = []
    opts.run_on_serial = False
    if opts.answers is None and os.path.exists(AUTO_ANSWERS_FILE):
        logger.debug("Autoloading answers from %s", AUTO_ANSWERS_FILE)
        opts.answers = AUTO_ANSWERS_FILE

    if opts.answers:
        opts.answers = open(opts.answers)
        try:
            fcntl.flock(opts.answers, fcntl.LOCK_EX | fcntl.LOCK_NB)
        except OSError:
            logger.exception("Failed to lock auto answers file, proceding without it.")
            opts.answers.close()
            opts.answers = None

    async def run_with_loop():
        subiquity_interface = SystemSetupClient(opts)
        subiquity_interface.note_file_for_apport(
            "InstallerClientLog", logfiles["debug"]
        )
        subiquity_interface.note_file_for_apport(
            "InstallerClientLogInfo", logfiles["info"]
        )
        await subiquity_interface.run()

    asyncio.run(run_with_loop())


if __name__ == "__main__":
    sys.exit(main())