import logging
from threading import Event

import deltachat
from deltachat import account_hookimpl


class SetupPlugin:
    def __init__(self, crew_id):
        self.member_added = Event()
        self.crew_id = crew_id
        self.message_sent = Event()
        self.outgoing_messages = 0

    @account_hookimpl
    def ac_member_added(self, chat: deltachat.Chat, contact, actor, message):
        if chat.id == self.crew_id and chat.num_contacts() == 2:
            self.member_added.set()

    @account_hookimpl
    def ac_message_delivered(self, message: deltachat.Message):
        if not message.is_system_message():
            self.outgoing_messages -= 1
            if self.outgoing_messages < 1:
                self.message_sent.set()


class RelayPlugin:
    def __init__(self, account: deltachat.Account):
        self.account = account

    @account_hookimpl
    def ac_incoming_message(self, message: deltachat.Message):
        """This method is called on every incoming message and decides what to do with it."""
        logging.info(
            "New message from %s in chat %s: %s",
            message.get_sender_contact().addr,
            message.chat.get_name(),
            message.text,
        )

        if message.is_system_message():
            logging.debug("This is a system message")
            """:TODO handle chat name changes"""
            return

        if message.chat.id == get_crew_id(self.account):
            if message.text.startswith("/"):
                logging.debug(
                    "handling command by %s: %s",
                    message.get_sender_contact().addr,
                    message.text,
                )
                """:TODO handle command"""
            else:
                logging.debug("Ignoring message, just admins chatting")

        elif self.is_relay_group(message.chat):
            if hasattr(message, "quote"):
                if (
                    message.quote.get_sender_contact()
                    == self.account.get_self_contact()
                ):
                    logging.debug("Forwarding message to outsider")
                    """:TODO forward to outsider"""
                else:
                    logging.debug("Ignoring message, just admins chatting")
            else:
                logging.debug("Ignoring message, just admins chatting")

        else:
            logging.debug("Forwarding message to relay group")
            self.forward_to_relay_group(message)

    def forward_to_relay_group(self, message: deltachat.Message):
        """forward a request to a relay group; create one if it doesn't exist yet."""
        outsider = message.get_sender_contact().addr
        crew_members = self.account.get_chat_by_id(
            get_crew_id(self.account)
        ).get_contacts()
        crew_members.remove(self.account.get_self_contact())
        group_name = "[%s] %s" % (
            self.account.get_config("addr").split("@")[0],
            message.chat.get_name(),
        )
        for chat in self.account.get_chats():
            if chat.get_name() == group_name:
                relay_group = chat
                break
        else:
            logging.info("creating new relay group: '%s'", group_name)
            relay_group = self.account.create_group_chat(
                group_name, crew_members, verified=False
            )
            # relay_group.set_profile_image("assets/avatar.jpg")
            relay_group.send_text(
                "This is the relay group for %s; I'll only forward 'direct replies' to the outside."
                % (message.chat.get_name())
            )
        message.set_override_sender_name(outsider)
        relay_group.send_msg(message)

    def is_relay_group(self, chat: deltachat.Chat) -> bool:
        """Check whether a chat is a relay group."""
        if not chat.get_name().startswith(
            "[%s] " % (self.account.get_config("addr").split("@")[0],)
        ):
            return False  # all relay groups' names begin with a [tag] with the localpart of the teamsbot's address
        if (
            chat.get_messages()[0].get_sender_contact()
            != self.account.get_self_contact()
        ):
            return False  # all relay groups were started by the teamsbot
        if chat.is_protected():
            return False  # relay groups don't need to be protected, so they are not
        for crew_member in self.account.get_chat_by_id(
            get_crew_id(self.account)
        ).get_contacts():
            if crew_member not in chat.get_contacts():
                return False  # all crew members have to be in any relay group
        return True


def get_crew_id(ac: deltachat.Account, setupplugin: SetupPlugin = None) -> int:
    """Get the group ID of the crew group if it exists; warn old crews if they might still believe they are the crew.

    :param ac: the account object of the bot.
    :param setupplugin: only if this function is run during `teams-bot init`.
    :return: the chat ID of the crew group, if there is none, return 0.
    """
    crew_id = 0
    for chat in reversed(ac.get_chats()):
        if (
            chat.is_protected()
            and chat.num_contacts() > 1
            and chat.get_name() == f"Team: {ac.get_config('addr')}"
        ):
            logging.debug(
                "Chat with ID %s and title %s could be a crew", chat.id, chat.get_name()
            )
            if crew_id > 0:
                old_crew = ac.get_chat_by_id(crew_id)
                old_crew.set_name(f"Old Team: {ac.get_config('addr')}")
                new_crew = [contact.addr for contact in chat.get_contacts()]
                new_crew_emails = " or ".join(new_crew)
                quit_message = f"There is a new Group for the Team now; you can ask {new_crew_emails} to add you to it."
                logging.debug(
                    "Sending quit message to old crew with ID %s: %s",
                    old_crew.id,
                    quit_message,
                )
                old_crew.send_text(quit_message)
                if setupplugin:
                    setupplugin.outgoing_messages += 1
                old_crew.remove_contact(ac.get_self_contact())
            crew_id = chat.id
        else:
            logging.debug(
                "Chat with ID %s and title %s is not a crew.", chat.id, chat.get_name()
            )
    if crew_id:
        crew_members = [
            contact.addr for contact in ac.get_chat_by_id(crew_id).get_contacts()
        ]
        crew_emails = " or ".join(crew_members)
        logging.debug("The current crew has ID %s and members %s", crew_id, crew_emails)
    else:
        logging.debug("Currently there is no crew")
    return crew_id