#!/usr/bin/env python3
import argparse
import asyncio
import dataclasses
import logging
import typing

import aiohttp.web
import jinja2
import markdown
import nio
import yaml


@dataclasses.dataclass
class Config:
    matrix_homeserver: str
    matrix_user: str
    matrix_password: str
    matrix_rooms: typing.Mapping[int, str]
    webhook_token: str


TEMPLATES = {
    "task.create": (
        "<b>[{{ event_data.task.project_name }}]</b> "
        "<font color='{{ event_data.task.color_id }}'>"
        "{{ event_data.task.title }}"
        "</font> "
        "(#{{ event_data.task.id }}): "
        "{{ event_author }} created the task in "
        "'{{ event_data.task.column_title }}'\n"
        "<blockquote>"
        "{{ event_data.task.description | markdown }}"
        "</blockquote>"
    ),
    "task.move.column": (
        "<b>[{{ event_data.task.project_name }}]</b> "
        "<font color='{{ event_data.task.color_id }}'>"
        "{{ event_data.task.title }}"
        "</font> "
        "(#{{ event_data.task.id }}): "
        "{{ event_author }} moved the task to "
        "'{{ event_data.task.column_title }}'"
    ),
    "task.close": (
        "<b>[{{ event_data.task.project_name }}]</b> "
        "<font color='{{ event_data.task.color_id }}'>"
        "{{ event_data.task.title }}"
        "</font>"
        "(#{{ event_data.task.id }}): "
        "{{ event_author }} closed the task"
    ),
    "comment.create": (
        "<b>[{{ event_data.task.project_name }}]</b> "
        "<font color='{{ event_data.task.color_id }}'>"
        "{{ event_data.task.title }}"
        "</font> "
        "(#{{ event_data.task.id }}): "
        "{{ event_author }} added a comment:\n"
        "<blockquote>"
        "{{ event_data.comment.comment | markdown }}"
        "</blockquote>"
    ),
}


async def format_events(config, src, dest):

    env = jinja2.Environment()
    md = markdown.Markdown(extensions=["fenced_code"])
    env.filters["markdown"] = lambda src: jinja2.Markup(md.convert(src))

    while True:
        event = await src.get()
        logging.debug("Formatting message: %s", event)

        try:
            project = event["event_data"]["task"]["project_id"]
        except KeyError:
            logging.warning("Missing project ID: %s", event)
            continue

        try:
            room = config.matrix_rooms[project]
        except KeyError:
            logging.info("Unknown project ID: %d", project)
            continue

        try:
            template = env.from_string(TEMPLATES[event["event_name"]])
        except KeyError:
            logging.info("Unknown message type: %s", event["event_name"])
            continue

        rendered = template.render(**event)
        await dest.put((room, rendered))


async def send_notices(config, src):
    client = nio.AsyncClient(config.matrix_homeserver, config.matrix_user)
    await client.login(config.matrix_password)

    while True:
        room, formatted = await src.get()

        await client.room_send(
            room,
            message_type="m.room.message",
            content={
                "msgtype": "m.notice",
                "format": "org.matrix.custom.html",
                "body": formatted,  # à corriger
                "formatted_body": formatted,
            },
        )


async def run_app(config, dest, host, port):
    async def webhook(request):
        tokens = request.query.getall("token", [])
        if config.webhook_token not in tokens:
            logging.warning("Invalid tokens: %s", tokens)
            raise aiohttp.web.HTTPForbidden("Invalid tokens")
        event = await request.json()
        await dest.put(event)

    app = aiohttp.web.Application()
    app.add_routes([aiohttp.web.post("/webhook", webhook)])

    runner = aiohttp.web.AppRunner(app)
    await runner.setup()
    await aiohttp.web.TCPSite(runner, host, port).start()


async def main():

    logging.basicConfig(level=logging.INFO)

    parser = argparse.ArgumentParser()
    parser.add_argument("-c", "--config", default="config.yaml")
    parser.add_argument("--host", default="0.0.0.0")
    parser.add_argument("--port", type=int, default=8000)

    args = parser.parse_args()

    with open(args.config) as f:
        config = yaml.safe_load(f)

    config = Config(**config)

    events = asyncio.Queue()
    formatted = asyncio.Queue()

    logging.info("Started Kanbot on %s:%d", args.host, args.port)

    tasks = (
        asyncio.create_task(run_app(config, events, args.host, args.port)),
        asyncio.create_task(format_events(config, events, formatted)),
        asyncio.create_task(send_notices(config, formatted)),
    )

    # on propage les exceptions
    await asyncio.gather(*tasks, return_exceptions=False)


if __name__ == "__main__":
    asyncio.get_event_loop().run_until_complete(main())