import os
from pathlib import Path
from contextlib import asynccontextmanager

from domain.config.service import ConfigService, VERSION
from domain.adapters.registry import runtime_registry
from db.session import close_db, init_db
from api.routers import include_routers
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
from fastapi import FastAPI, HTTPException, Request
from fastapi.exceptions import RequestValidationError
from middleware.exception_handler import (
    global_exception_handler,
    http_exception_handler,
    httpx_exception_handler,
    validation_exception_handler,
)
import httpx
from dotenv import load_dotenv
from domain.tasks.task_queue import task_queue_service

load_dotenv()


class SPAStaticFiles(StaticFiles):
    async def get_response(self, path, scope):
        response = await super().get_response(path, scope)
        if response.status_code == 404:
            return await super().get_response("index.html", scope)
        return response


INDEX_FILE = Path("web/dist/index.html")
SPA_EXCLUDE_PREFIXES = ("/api", "/docs", "/openapi.json", "/webdav", "/s3")


async def spa_fallback_middleware(request: Request, call_next):
    response = await call_next(request)
    if (
        response.status_code == 404
        and request.method == "GET"
        and "text/html" in request.headers.get("accept", "")
        and not request.url.path.startswith(SPA_EXCLUDE_PREFIXES)
        and INDEX_FILE.exists()
    ):
        return FileResponse(INDEX_FILE)
    return response


@asynccontextmanager
async def lifespan(app: FastAPI):
    os.makedirs("data/db", exist_ok=True)
    await init_db()
    await runtime_registry.refresh()
    await ConfigService.set("APP_VERSION", VERSION)
    await task_queue_service.start_worker()
    try:
        yield
    finally:
        await task_queue_service.stop_worker()
        await close_db()


def create_app() -> FastAPI:
    app = FastAPI(
        title="Foxel",
        description="A highly extensible private cloud storage solution for individuals and teams",
        lifespan=lifespan,
    )
    app.middleware("http")(spa_fallback_middleware)
    include_routers(app)
    app.add_exception_handler(HTTPException, http_exception_handler)
    app.add_exception_handler(RequestValidationError, validation_exception_handler)
    app.add_exception_handler(httpx.HTTPStatusError, httpx_exception_handler)
    app.add_exception_handler(Exception, global_exception_handler)
    return app


app = create_app()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
app.mount("/", SPAStaticFiles(directory="web/dist", html=True, check_dir=False), name="static")
if __name__ == "__main__":
    import uvicorn
    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)