#!/usr/bin/env python3


# Libervia CLI
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)

# 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/>.


from functools import partial
import importlib
import logging


from libervia.backend.core.i18n import _
from libervia.backend.tools.common import data_format
from libervia.cli.constants import Const as C
from libervia.frontends.tools import jid

from . import base
from .call_webrtc import CallData, WebRTCCall

__commands__ = ["Call"]


class Common(base.CommandBase):


    def __init__(self, *args, **kwargs):
        super().__init__(
            *args,
            use_output=C.OUTPUT_CUSTOM,
            extra_outputs={
                #: automatically select best output for current platform
                "default": self.auto_output,
                #: simple output with GStreamer ``autovideosink``
                "simple": partial(self.use_output, "simple"),
                #: Qt GUI
                "gui": partial(self.use_output, "gui"),
                #: experimental TUI output
                "tui": partial(self.use_output, "tui"),
            },
            **kwargs
        )

    def add_parser_options(self):
        self.parser.add_argument(
            "--no-ui", action="store_true", help=_("disable user interface")
        )

    async def start(self):
        root_logger = logging.getLogger()
        # we don't want any formatting for messages from webrtc
        for handler in root_logger.handlers:
            handler.setFormatter(None)
        if self.verbosity == 0:
            root_logger.setLevel(logging.ERROR)
        if self.verbosity >= 1:
            root_logger.setLevel(logging.WARNING)
        if self.verbosity >= 2:
            root_logger.setLevel(logging.DEBUG)

    async def auto_output(self, call_data: CallData) -> None:
        """Make a guess on the best output to use on current platform"""
        try:
            from .call_gui import AVCallUI
        except ImportError:
            # we can't import GUI, we may have missing modules
            await self.use_output("simple", call_data)
        else:
            if AVCallUI.can_run():
                await self.use_output("gui", call_data)
            else:
                await self.use_output("simple", call_data)

    async def use_output(self, output_type, call_data: CallData):
        try:
            AVCall_module = importlib.import_module(f"libervia.cli.call_{output_type}")
            AVCallUI = AVCall_module.AVCallUI
        except Exception as e:
            self.disp(f"Error starting {output_type.upper()} UI: {e}", error=True)
            self.host.quit(C.EXIT_ERROR)
        else:
            try:
                await AVCallUI.run(self, call_data)
            except Exception as e:
                self.disp(f"Error running {output_type.upper()} UI: {e}", error=True)
                self.host.quit(C.EXIT_ERROR)


class Make(Common):
    def __init__(self, host):
        super().__init__(
            host,
            "make",
            use_verbose=True,
            help=_("start a call"),
        )

    def add_parser_options(self):
        super().add_parser_options()
        self.parser.add_argument(
            "entity",
            metavar="JID",
            help=_("JIDs of entity to call"),
        )

    async def start(self):
        await super().start()
        await super().output(CallData(
            callee=jid.JID(self.args.entity),
        ))


class Receive(Common):
    def __init__(self, host):
        super().__init__(
            host,
            "receive",
            use_verbose=True,
            help=_("wait for a call"),
        )

    def add_parser_options(self):
        super().add_parser_options()
        auto_accept_group = self.parser.add_mutually_exclusive_group()
        auto_accept_group.add_argument(
            "-a",
            "--auto-accept",
            action="append",
            metavar="JID",
            default=[],
            help=_("automatically accept call from this jid (can be used multiple times)")
        )
        auto_accept_group.add_argument(
            "--auto-accept-all",
            action="store_true",
            help=_("automatically accept call from anybody")
        )

    async def on_action_new(
        self, action_data_s: str, action_id: str, security_limit: int, profile: str
    ) -> None:
        if profile != self.profile:
            return
        action_data = data_format.deserialise(action_data_s)
        if action_data.get("type") != C.META_TYPE_CALL:
            return
        peer_jid = jid.JID(action_data["from_jid"]).bare
        caller = peer_jid.bare
        if (
            not self.args.auto_accept_all
            and caller not in self.args.auto_accept
            and not await self.host.confirm(
                _("📞 Incoming call from {caller}, do you accept?").format(
                    caller=caller
                )
            )
        ):
            await self.host.bridge.action_launch(
                action_id, data_format.serialise({"cancelled": True}), profile
            )
            return

        self.disp(_("✅ Incoming call from {caller} accepted.").format(caller=caller))

        await super().output(CallData(
            callee=peer_jid,
            sid=action_data["session_id"],
            action_id=action_id
        ))

    async def start(self):
        await super().start()
        self.host.bridge.register_signal("action_new", self.on_action_new, "core")


class Call(base.CommandBase):
    subcommands = (Make, Receive)

    def __init__(self, host):
        super().__init__(host, "call", use_profile=False, help=_("A/V calls and related"))