# mautrix-telegram - A Matrix-Telegram puppeting bridge
# Copyright (C) 2021 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 __future__ import annotations

import logging

from telethon import TelegramClient

from mautrix.types import RoomID, UserID
from mautrix.util.formatter import MatrixParser as BaseMatrixParser, RecursionContext
from mautrix.util.formatter.html_reader_htmlparser import HTMLNode, read_html
from mautrix.util.logging import TraceLogger

from ... import portal as po, puppet as pu, user as u
from .telegram_message import TelegramEntityType, TelegramMessage

log: TraceLogger = logging.getLogger("mau.fmt.mx")


class MatrixParser(BaseMatrixParser[TelegramMessage]):
    e = TelegramEntityType
    fs = TelegramMessage
    read_html = staticmethod(read_html)
    client: TelegramClient

    def __init__(self, client: TelegramClient) -> None:
        self.client = client

    async def custom_node_to_fstring(
        self, node: HTMLNode, ctx: RecursionContext
    ) -> TelegramMessage | None:
        if node.tag == "command":
            msg = await self.tag_aware_parse_node(node, ctx)
            return msg.prepend("/").format(TelegramEntityType.COMMAND)
        return None

    async def user_pill_to_fstring(self, msg: TelegramMessage, user_id: UserID) -> TelegramMessage:
        user = await pu.Puppet.get_by_mxid(user_id) or await u.User.get_by_mxid(
            user_id, create=False
        )
        if not user:
            return msg
        if user.tg_username:
            return TelegramMessage(f"@{user.tg_username}").format(TelegramEntityType.MENTION)
        elif user.tgid:
            displayname = user.plain_displayname or msg.text
            msg = TelegramMessage(displayname)
            try:
                input_entity = await self.client.get_input_entity(user.tgid)
            except (ValueError, TypeError) as e:
                log.trace(f"Dropping mention of {user.tgid}: {e}")
            else:
                msg = msg.format(TelegramEntityType.MENTION_NAME, user_id=input_entity)
        return msg

    async def url_to_fstring(self, msg: TelegramMessage, url: str) -> TelegramMessage:
        if url == msg.text:
            return msg.format(self.e.URL)
        else:
            return msg.format(self.e.INLINE_URL, url=url)

    async def room_pill_to_fstring(self, msg: TelegramMessage, room_id: RoomID) -> TelegramMessage:
        username = po.Portal.get_username_from_mx_alias(room_id)
        portal = await po.Portal.find_by_username(username)
        if portal and portal.username:
            return TelegramMessage(f"@{portal.username}").format(TelegramEntityType.MENTION)

    async def header_to_fstring(self, node: HTMLNode, ctx: RecursionContext) -> TelegramMessage:
        children = await self.node_to_fstrings(node, ctx)
        length = int(node.tag[1])
        prefix = "#" * length + " "
        return TelegramMessage.join(children, "").prepend(prefix).format(TelegramEntityType.BOLD)

    async def blockquote_to_fstring(
        self, node: HTMLNode, ctx: RecursionContext
    ) -> TelegramMessage:
        msg = await self.tag_aware_parse_node(node, ctx)
        children = msg.trim().split("\n")
        children = [child.prepend("> ") for child in children]
        return TelegramMessage.join(children, "\n")

    async def color_to_fstring(self, msg: TelegramMessage, color: str) -> TelegramMessage:
        return msg

    async def spoiler_to_fstring(self, msg: TelegramMessage, reason: str) -> TelegramMessage:
        msg = msg.format(self.e.SPOILER)
        if reason:
            msg = msg.prepend(f"{reason}: ")
        return msg
