# mautrix-signal - A Matrix-Signal puppeting bridge
# Copyright (C) 2020 Tulir Asokan
#
# 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 <https://www.gnu.org/licenses/>.
from typing import (Optional, Dict, AsyncIterable, Awaitable, AsyncGenerator, Union,
                    TYPE_CHECKING, cast)
from uuid import UUID
import asyncio

from mausignald.types import Address, Contact, Profile
from mautrix.bridge import BasePuppet
from mautrix.appservice import IntentAPI
from mautrix.types import UserID, SyncToken, RoomID
from mautrix.util.simple_template import SimpleTemplate

from .db import Puppet as DBPuppet
from .config import Config
from . import portal as p

if TYPE_CHECKING:
    from .__main__ import SignalBridge

try:
    import phonenumbers
except ImportError:
    phonenumbers = None


class Puppet(DBPuppet, BasePuppet):
    by_uuid: Dict[UUID, 'Puppet'] = {}
    by_number: Dict[str, 'Puppet'] = {}
    by_custom_mxid: Dict[UserID, 'Puppet'] = {}
    hs_domain: str
    mxid_template: SimpleTemplate[str]

    config: Config

    default_mxid_intent: IntentAPI
    default_mxid: UserID

    _uuid_lock: asyncio.Lock
    _update_info_lock: asyncio.Lock

    def __init__(self, uuid: Optional[UUID], number: Optional[str],
                 name: Optional[str] = None, uuid_registered: bool = False,
                 number_registered: bool = False, custom_mxid: Optional[UserID] = None,
                 access_token: Optional[str] = None, next_batch: Optional[SyncToken] = None
                 ) -> None:
        super().__init__(uuid=uuid, number=number, name=name, uuid_registered=uuid_registered,
                         number_registered=number_registered, custom_mxid=custom_mxid,
                         access_token=access_token, next_batch=next_batch)
        self.log = self.log.getChild(str(uuid) or number)

        self.default_mxid = self.get_mxid_from_id(self.address)
        self.default_mxid_intent = self.az.intent.user(self.default_mxid)
        self.intent = self._fresh_intent()

        self._uuid_lock = asyncio.Lock()
        self._update_info_lock = asyncio.Lock()

    @classmethod
    def init_cls(cls, bridge: 'SignalBridge') -> AsyncIterable[Awaitable[None]]:
        cls.config = bridge.config
        cls.loop = bridge.loop
        cls.mx = bridge.matrix
        cls.az = bridge.az
        cls.hs_domain = cls.config["homeserver.domain"]
        cls.mxid_template = SimpleTemplate(cls.config["bridge.username_template"], "userid",
                                           prefix="@", suffix=f":{cls.hs_domain}", type=str)
        cls.sync_with_custom_puppets = cls.config["bridge.sync_with_custom_puppets"]
        secret = cls.config["bridge.login_shared_secret"]
        cls.login_shared_secret = secret.encode("utf-8") if secret else None
        cls.login_device_name = "Signal Bridge"
        return (puppet.try_start() async for puppet in cls.all_with_custom_mxid())

    def intent_for(self, portal: 'p.Portal') -> IntentAPI:
        if portal.chat_id == self.uuid:
            return self.default_mxid_intent
        return self.intent

    @property
    def is_registered(self) -> bool:
        return (self.uuid is not None and self.uuid_registered) or self.number_registered

    @is_registered.setter
    def is_registered(self, value: bool) -> None:
        if self.uuid is not None:
            self.uuid_registered = value
        else:
            self.number_registered = value

    @property
    def address(self) -> Address:
        return Address(uuid=self.uuid, number=self.number)

    async def handle_uuid_receive(self, uuid: UUID) -> None:
        async with self._uuid_lock:
            if self.uuid:
                # Received UUID was handled while this call was waiting
                return
            await self._handle_uuid_receive(uuid)

    async def _handle_uuid_receive(self, uuid: UUID) -> None:
        self.log.debug(f"Found UUID for user: {uuid}")
        await self._set_uuid(uuid)
        self.by_uuid[self.uuid] = self
        prev_intent = self.default_mxid_intent
        self.default_mxid = self.get_mxid_from_id(self.address)
        self.default_mxid_intent = self.az.intent.user(self.default_mxid)
        self.intent = self._fresh_intent()
        self.log = self.log.getChild(str(uuid))
        self.log.debug(f"Migrating memberships {prev_intent.mxid} -> {self.default_mxid_intent}")
        for room_id in await prev_intent.get_joined_rooms():
            await prev_intent.invite_user(room_id, self.default_mxid)
            await self.default_mxid_intent.join_room_by_id(room_id)
            await prev_intent.leave_room(room_id)

    async def update_info(self, info: Union[Profile, Contact]) -> None:
        if isinstance(info, Contact):
            if info.address.uuid and not self.uuid:
                await self.handle_uuid_receive(info.address.uuid)
            if not self.config["bridge.allow_contact_list_name_updates"] and self.name is not None:
                return

        async with self._update_info_lock:
            update = False
            update = await self._update_name(info.name) or update
            if update:
                await self.update()

    @staticmethod
    def fmt_phone(number: str) -> str:
        if phonenumbers is None:
            return number
        parsed = phonenumbers.parse(number)
        fmt = phonenumbers.PhoneNumberFormat.INTERNATIONAL
        return phonenumbers.format_number(parsed, fmt)

    @classmethod
    def _get_displayname(cls, address: Address, name: Optional[str]) -> str:
        names = name.split("\x00") if name else []
        data = {
            "first_name": names[0] if len(names) > 0 else "",
            "last_name": names[-1] if len(names) > 1 else "",
            "full_name": " ".join(names),
            "phone": cls.fmt_phone(address.number),
            "uuid": str(address.uuid) if address.uuid else None,
        }
        for pref in cls.config["bridge.displayname_preference"]:
            value = data.get(pref.replace(" ", "_"))
            if value:
                data["displayname"] = value
                break

        return cls.config["bridge.displayname_template"].format(**data)

    async def _update_name(self, name: Optional[str]) -> bool:
        name = self._get_displayname(self.address, name)
        if name != self.name:
            self.name = name
            await self.default_mxid_intent.set_displayname(self.name)
            self.loop.create_task(self._update_portal_names())
            return True
        return False

    async def _update_portal_names(self) -> None:
        async for portal in p.Portal.find_private_chats_with(self.uuid):
            await portal.update_puppet_name(self.name)

    async def default_puppet_should_leave_room(self, room_id: RoomID) -> bool:
        portal = await p.Portal.get_by_mxid(room_id)
        return portal and portal.chat_id != self.uuid

    # region Database getters

    def _add_to_cache(self) -> None:
        if self.uuid:
            self.by_uuid[self.uuid] = self
        if self.number:
            self.by_number[self.number] = self
        if self.custom_mxid:
            self.by_custom_mxid[self.custom_mxid] = self

    async def save(self) -> None:
        await self.update()

    @classmethod
    async def get_by_mxid(cls, mxid: UserID, create: bool = True) -> Optional['Puppet']:
        address = cls.get_id_from_mxid(mxid)
        if not address:
            return None
        return await cls.get_by_address(address, create)

    @classmethod
    async def get_by_custom_mxid(cls, mxid: UserID) -> Optional['Puppet']:
        try:
            return cls.by_custom_mxid[mxid]
        except KeyError:
            pass

        puppet = cast(cls, await super().get_by_custom_mxid(mxid))
        if puppet:
            puppet._add_to_cache()
            return puppet

        return None

    @classmethod
    def get_id_from_mxid(cls, mxid: UserID) -> Optional[Address]:
        identifier = cls.mxid_template.parse(mxid)
        if not identifier:
            return None
        if identifier.startswith("phone_"):
            return Address(number="+" + identifier[len("phone_"):])
        else:
            try:
                return Address(uuid=UUID(identifier.upper()))
            except ValueError:
                return None

    @classmethod
    def get_mxid_from_id(cls, address: Address) -> UserID:
        if address.uuid:
            identifier = str(address.uuid).lower()
        elif address.number:
            identifier = f"phone_{address.number.lstrip('+')}"
        else:
            raise ValueError("Empty address")
        return UserID(cls.mxid_template.format_full(identifier))

    @classmethod
    async def get_by_address(cls, address: Address, create: bool = True) -> Optional['Puppet']:
        puppet = await cls._get_by_address(address, create)
        if puppet and address.uuid and not puppet.uuid:
            # We found a UUID for this user, store it ASAP
            await puppet.handle_uuid_receive(address.uuid)
        return puppet

    @classmethod
    async def _get_by_address(cls, address: Address, create: bool = True) -> Optional['Puppet']:
        if not address.is_valid:
            raise ValueError("Empty address")
        if address.uuid:
            try:
                return cls.by_uuid[address.uuid]
            except KeyError:
                pass
        if address.number:
            try:
                return cls.by_number[address.number]
            except KeyError:
                pass

        puppet = cast(cls, await super().get_by_address(address))
        if puppet is not None:
            puppet._add_to_cache()
            return puppet

        if create:
            puppet = cls(address.uuid, address.number)
            await puppet.insert()
            puppet._add_to_cache()
            return puppet

        return None

    @classmethod
    async def all_with_custom_mxid(cls) -> AsyncGenerator['Puppet', None]:
        puppets = await super().all_with_custom_mxid()
        puppet: cls
        for index, puppet in enumerate(puppets):
            try:
                yield cls.by_uuid[puppet.uuid]
            except KeyError:
                try:
                    yield cls.by_number[puppet.number]
                except KeyError:
                    puppet._add_to_cache()
                    yield puppet

    # endregion