import asyncio
from typing import Callable

from fastapi import FastAPI, Request, Response, Path, 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': 0,
        'name': 'Текущее состояние сотрудников',
        'time': '0 11 * * 1-5',
        'messageNumber': '1 вопрос',
        'isEnabled': True,
    },
    {
        'id': 1,
        'name': 'Планы на обед',
        'time': '45 11 * * 1-5',
        'messageNumber': '2 вопроса',
        'isEnabled': False,
    },
]


scripts_cm = ConnectionManager()


@api.middleware('http')
async def function(
        request: Request,
        callback: Callable,
):
    response: Response = await callback(request)
    response.headers.append('Access-Control-Allow-Methods', '*')
    response.headers.append('Access-Control-Allow-Headers', '*')
    response.headers.append('Access-Control-Allow-Origin', '*')
    return response


@api.options(
    path='/{path:path}',
)
async def _(
        path: str,
):
    return Response()


@api.get(
    path='/api/scripts',
)
async def _():
    return JSONResponse(
        content=[
            script
            for script in scripts
            if script is not None
        ],
        status_code=200,
    )


@api.post(
    path='/api/scripts',
)
async def _(
        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',
        ),
):
    script = {
        'id': len(scripts),
        'name': name,
        'time': time,
        'messageNumber': message_number,
        'isEnabled': is_enabled,
    },
    scripts.append(script)
    return Response(
        status_code=201,
    )


@api.put(
    path='/api/scripts/{script_id}',
)
async def _(
        script_id: int = Path(),
        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',
        ),
):
    scripts[script_id]['name'] = name
    scripts[script_id]['time'] = time
    scripts[script_id]['messageNumber'] = message_number
    scripts[script_id]['isEnabled'] = is_enabled
    return Response(
        status_code=201,
    )


@api.delete(
    path='/api/scripts/{script_id}',
)
async def _(
        script_id: int = Path(),
):
    scripts[script_id] = None
    return Response(
        status_code=204,
    )


@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)