import asyncio
from threading import Thread
from aiohttp import web


class MockMailmanServer:
    def __init__(self, port=8001, prefix='/3.1'):
        self.port = port
        self.app = web.Application()
        self.app.add_routes([
            web.post(prefix + '/members', self.subscribe),
            web.delete(prefix + '/lists/{mailing_list}/member/{address}', self.unsubscribe),
        ])
        self.runner = web.AppRunner(self.app)
        self.loop = asyncio.new_event_loop()

        # add more as necessary
        self.subscriptions = {
            'csc-general': [],
            'exec': [],
            'syscom': [],
            'syscom-alerts': [],
        }

    def _start_loop(self):
        asyncio.set_event_loop(self.loop)
        self.loop.run_until_complete(self.runner.setup())
        site = web.TCPSite(self.runner, '127.0.0.1', self.port)
        self.loop.run_until_complete(site.start())
        self.loop.run_forever()

    def start(self):
        t = Thread(target=self._start_loop)
        t.start()

    def stop(self):
        self.loop.call_soon_threadsafe(self.loop.stop)

    def clear(self):
        for key in self.subscriptions:
            self.subscriptions[key].clear()

    async def subscribe(self, request):
        body = await request.post()
        subscriber = body['subscriber']
        list_id = body['list_id']
        list_id = list_id[:list_id.index('.')]
        if list_id not in self.subscriptions:
            return web.json_response({
                'description': 'No such list',
            }, status=400)
        subscribers = self.subscriptions[list_id]
        if subscriber in subscribers:
            return web.json_response({
                'description': 'user is already subscribed',
            }, status=409)
        subscribers.append(subscriber)
        return web.json_response({'status': 'OK'})

    async def unsubscribe(self, request):
        subscriber = request.match_info['address']
        list_id = request.match_info['mailing_list']
        list_id = list_id[:list_id.index('@')]
        subscribers = self.subscriptions.get(list_id, [])
        if subscriber not in subscribers:
            return web.json_response({
                'description': 'user is not subscribed',
            }, status=404)
        subscribers.remove(subscriber)
        return web.json_response({'status': 'OK'})


if __name__ == '__main__':
    server = MockMailmanServer()
    server.start()