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use std::{
    io::{Error, ErrorKind, Result},
    pin::Pin,
    result::Result as StdResult,
    task::{Context, Poll},
};

use hyper::{service::Service, Request, Response, StatusCode};

use std::future::Future;

use crate::{
    body::Body,
    request_resolve::{RequestResolve, Resolved},
    resp_builder::ResponseBuilder,
};

#[derive(Clone)]
pub struct FileService {
    local_root: String,
}

impl FileService {
    pub fn new(root: impl Into<String>) -> Self {
        let local_root = root.into();
        Self { local_root }
    }

    async fn serv<B>(self, request: Request<B>) -> Result<Response<Body>> {
        let resolved = RequestResolve::resolve(&self.local_root, &request).await?;
        let resp = match resolved {
            Resolved::IsDirectory => Response::builder()
                .status(StatusCode::FORBIDDEN)
                .body(Body::Empty),
            Resolved::MethodNotMatched => Response::builder()
                .status(StatusCode::BAD_REQUEST)
                .body(Body::Empty),
            Resolved::NotFound => Response::builder()
                .status(StatusCode::NOT_FOUND)
                .body(Body::Empty),
            Resolved::PermissionDenied => Response::builder()
                .status(StatusCode::FORBIDDEN)
                .body(Body::Empty),
            Resolved::Found(f) => ResponseBuilder::new().request(&request).build(f),
        };
        let resp = match resp {
            Ok(resp) => resp,
            Err(e) => {
                let e = Error::new(ErrorKind::Other, e);
                return Err(e);
            }
        };
        Ok(resp)
    }
}

impl<B> Service<Request<B>> for FileService
where
    B: Sync + Send + 'static,
{
    type Response = Response<Body>;

    type Error = Error;

    type Future = Pin<Box<dyn Future<Output = Result<Self::Response>> + Send>>;

    fn call(&mut self, request: Request<B>) -> Self::Future {
        Box::pin(self.clone().serv(request))
    }

    fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<()>> {
        Poll::Ready(Ok(()))
    }
}

#[derive(Clone)]
pub struct FileServiceMaker {
    local_root: String,
}

impl FileServiceMaker {
    pub fn new(local_root: impl Into<String>) -> Self {
        let local_root = local_root.into();
        Self { local_root }
    }
}

impl<T> Service<T> for FileServiceMaker {
    type Response = FileService;

    type Error = hyper::Error;

    type Future = Pin<Box<dyn Future<Output = StdResult<Self::Response, Self::Error>> + Send>>;

    fn poll_ready(&mut self, _: &mut Context<'_>) -> Poll<StdResult<(), Self::Error>> {
        Poll::Ready(Ok(()))
    }

    fn call(&mut self, _: T) -> Self::Future {
        let local_root = self.local_root.clone();
        Box::pin(async move { Ok(FileService::new(local_root)) })
    }
}