import asyncio

from fastapi import FastAPI, Response, Body
from fastapi.websockets import WebSocket, WebSocketDisconnect
from fastapi.responses import JSONResponse

import config


class ConnectionManager:
    connections: list[WebSocket]

    class StateError(Exception):
        pass

    def __init__(
            self,
    ):
        self.connections = []

    async def connect(
            self,
            websocket: WebSocket,
    ):
        await websocket.accept()
        self.connections.append(websocket)

    def disconnect(
            self,
            websocket: WebSocket,
    ):
        self.connections.remove(websocket)

    async def broadcast(
            self,
            data: any,
    ):
        for connection in self.connections:
            asyncio.ensure_future(connection.send_json(data))


api = FastAPI(
    title=config.Main.app_name,
)

scripts = [
    {
        'id': 1,
        'name': 'Текущее состояние сотрудников',
        'time': '0 11 * * 1-5',
        'messageNumber': '1 вопрос',
        'isEnabled': True,
    },
    {
        'id': 2,
        'name': 'Планы на обед',
        'time': '45 11 * * 1-5',
        'messageNumber': '2 вопроса',
        'isEnabled': False,
    },
]


scripts_cm = ConnectionManager()


# TODO(Development-only headers)
cors = {
    'Access-Control-Allow-Methods': '*',
    'Access-Control-Allow-Headers': '*',
    'Access-Control-Allow-Origin': '*',
}


@api.options(
    path='/api/scripts',
)
async def _():
    return Response(
        headers=cors,
    )


@api.get(
    path='/api/scripts',
)
async def _():
    return JSONResponse(
        content=scripts,
        status_code=200,
        headers=cors,
    )


@api.put(
    path='/api/scripts',
)
async def _(
        script_id: int = Body(
            alias='id',
            validation_alias='id',
            serialization_alias='id',
        ),
        name: str = Body(),
        time: str = Body(),
        message_number: str = Body(
            alias='messageNumber',
            validation_alias='messageNumber',
            serialization_alias='messageNumber',
        ),
        is_enabled: bool = Body(
            alias='isEnabled',
            validation_alias='isEnabled',
            serialization_alias='isEnabled',
        ),
):
    i = script_id - 1
    scripts[i]['name'] = name
    scripts[i]['time'] = time
    scripts[i]['messageNumber'] = message_number
    scripts[i]['isEnabled'] = is_enabled
    return Response(
        status_code=201,
        headers=cors,
    )


@api.websocket(
    path='/ws/scripts',
)
async def _(
        websocket: WebSocket,
):
    await scripts_cm.connect(websocket)
    try:
        await scripts_cm.broadcast(scripts)
        while True:
            await websocket.receive_json()
    except WebSocketDisconnect:
        scripts_cm.disconnect(websocket)