from __future__ import annotations

from itertools import chain
from typing import TYPE_CHECKING, Dict, Mapping, Tuple

from slack.slack_buffer import SlackBuffer
from slack.slack_message import SlackMessage, SlackTs
from slack.task import gather

if TYPE_CHECKING:
    from typing_extensions import Literal

    from slack.slack_workspace import SlackWorkspace


class SlackThread(SlackBuffer):
    def __init__(self, parent: SlackMessage) -> None:
        super().__init__()
        self.parent = parent

    @property
    def workspace(self) -> SlackWorkspace:
        return self.parent.workspace

    @property
    def context(self) -> Literal["conversation", "thread"]:
        return "thread"

    @property
    def messages(self) -> Mapping[SlackTs, SlackMessage]:
        return self.parent.replies

    async def get_name_and_buffer_props(self) -> Tuple[str, Dict[str, str]]:
        conversation_name = await self.parent.conversation.name_with_prefix("full_name")
        name = f"{conversation_name}.${self.parent.hash}"
        short_name = f" ${self.parent.hash}"

        return name, {
            "short_name": short_name,
            "title": "topic",
            "input_multiline": "1",
            "localvar_set_type": self.parent.conversation.buffer_type,
            "localvar_set_slack_type": "thread",
            "localvar_set_nick": self.workspace.my_user.nick(),
            "localvar_set_channel": name,
            "localvar_set_server": self.workspace.name,
        }

    async def buffer_switched_to(self):
        await self.fill_history()

    async def print_history(self):
        if self.history_filled:
            return

        self.history_filled = True

        with self.loading():
            messages = chain([self.parent], self.parent.replies.values())
            for message in messages:
                await self.print_message(message, backlog=True)

    async def fill_history(self):
        if self.history_pending:
            return

        if self.parent.reply_history_filled:
            await self.print_history()
            return

        with self.loading():
            self.history_pending = True

            messages = await self.parent.conversation.fetch_replies(self.parent.ts)

            sender_user_ids = [m.sender_user_id for m in messages if m.sender_user_id]
            self.workspace.users.initialize_items(sender_user_ids)

            sender_bot_ids = [
                m.sender_bot_id
                for m in messages
                if m.sender_bot_id and not m.sender_user_id
            ]
            self.workspace.bots.initialize_items(sender_bot_ids)

            await gather(*(message.render(self.context) for message in messages))
            await self.print_history()

            self.history_pending = False