import asyncio
import os
import sys
from importlib import import_module
from os.path import exists

from ariadne import load_schema_from_path, make_executable_schema
from ariadne.asgi import GraphQL
from starlette.applications import Starlette
from starlette.middleware import Middleware
from starlette.middleware.cors import CORSMiddleware
from starlette.requests import Request
from starlette.responses import JSONResponse, Response
from starlette.routing import Route

from cache.precache import precache_data
from cache.revalidator import revalidation_manager
from services.exception import ExceptionHandlerMiddleware
from services.redis import redis
from services.schema import create_all_tables, resolvers
from services.search import search_service
from services.viewed import ViewedStorage
from services.webhook import WebhookEndpoint, create_webhook_endpoint
from settings import DEV_SERVER_PID_FILE_NAME, MODE

import_module("resolvers")
schema = make_executable_schema(load_schema_from_path("schema/"), resolvers)


async def start():
    if MODE == "development":
        if not exists(DEV_SERVER_PID_FILE_NAME):
            # pid file management
            with open(DEV_SERVER_PID_FILE_NAME, "w", encoding="utf-8") as f:
                f.write(str(os.getpid()))
    print(f"[main] process started in {MODE} mode")


async def lifespan(_app):
    try:
        create_all_tables()
        await asyncio.gather(
            redis.connect(),
            precache_data(),
            ViewedStorage.init(),
            create_webhook_endpoint(),
            search_service.info(),
            start(),
            revalidation_manager.start(),
        )
        yield
    finally:
        tasks = [redis.disconnect(), ViewedStorage.stop(), revalidation_manager.stop()]
        await asyncio.gather(*tasks, return_exceptions=True)


# Создаем экземпляр GraphQL
graphql_app = GraphQL(schema, debug=True)


# Оборачиваем GraphQL-обработчик для лучшей обработки ошибок
async def graphql_handler(request: Request):
    if request.method not in ["GET", "POST"]:
        return JSONResponse({"error": "Method Not Allowed"}, status_code=405)

    try:
        result = await graphql_app.handle_request(request)
        if isinstance(result, Response):
            return result
        return JSONResponse(result)
    except asyncio.CancelledError:
        return JSONResponse({"error": "Request cancelled"}, status_code=499)
    except Exception as e:
        print(f"GraphQL error: {str(e)}")
        return JSONResponse({"error": str(e)}, status_code=500)

middleware = [
	    # Начинаем с обработки ошибок
    Middleware(ExceptionHandlerMiddleware),
    # CORS должен быть перед другими middleware для корректной обработки preflight-запросов
    Middleware(
        CORSMiddleware,
        allow_origins=[
            "https://localhost:3000",
            "https://testing.discours.io",
            "https://testing3.discours.io",
            "https://discours.io",
            "https://new.discours.io"
        ],
        allow_methods=["GET", "POST", "OPTIONS"],  # Явно указываем OPTIONS
        allow_headers=["*"],
        allow_credentials=True,
    ),
]

# Обновляем маршрут в Starlette
app = Starlette(
    routes=[
        Route("/", graphql_handler, methods=["GET", "POST"]),
        Route("/new-author", WebhookEndpoint),
    ],
    middleware=middleware,
    lifespan=lifespan,
    debug=True,
)

app.add_middleware(ExceptionHandlerMiddleware)
if "dev" in sys.argv:
    app.add_middleware(
        CORSMiddleware,
        allow_origins=["https://localhost:3000"],
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )