use std::{collections::HashMap, str::FromStr};

use warp::{
    http::HeaderValue,
    hyper::Uri,
    path::Tail,
    reply::{Html, Response},
    Filter, Rejection, Reply,
};

use crate::svc::auth::AuthError;

use super::{
    servek::{Server, ServerError},
    CreateProfileRequest, ErrorTemplate,
};
use rust_embed::RustEmbed;

#[derive(RustEmbed)]
#[folder = "static"]
struct StaticData;

impl Server {
    pub(super) async fn html(
        &self,
    ) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
        Self::index()
            .or(self.profile())
            .or(self.create_profile())
            .or(Server::static_files())
            .or(self.login_page())
            .or(self.login())
            .or(Self::handler_404())
    }

    fn index() -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
        warp::get().and(warp::path::end().map(move || {
            warp::reply::html(include_str!("../../templates/html/index.html").to_owned())
        }))
    }

    fn handler_404() -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
        warp::get().and(warp::path::end().map(move || {
            warp::reply::html(include_str!("../../templates/html/404.html").to_owned())
        }))
    }

    fn login_with_error(&self, error: String) -> Result<Html<String>, Rejection> {
        self.hb
            .render("login-error", &serde_json::json!(ErrorTemplate { error }))
            .map(|html| warp::reply::html(html))
            .map_err(|e| ServerError::from(e).rejection())
    }

    fn login_page(
        &self,
    ) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
        warp::get().and(warp::path::path("login").map(move || {
            warp::reply::html(include_str!("../../templates/html/login.html").to_owned())
        }))
    }

    fn login(&self) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
        warp::post().and(
            warp::body::content_length_limit(8192).and(
                warp::path::path("login")
                    .and(Self::with_server(self.clone()))
                    .and(warp::body::form())
                    .and_then(|srv: Server, body: HashMap<String, String>| async move {
                        let user = body.get("username").ok_or(
                            ServerError::BadRequest("no username provided".to_owned()).rejection(),
                        )?;
                        let pass = body.get("password").ok_or(
                            ServerError::BadRequest("no password provided".to_owned()).rejection(),
                        )?;
                        let token = srv
                            .auth
                            .login(user.clone(), pass.clone())
                            .await
                            .map(|html| warp::reply::html(html));
                        if let Err(e) = &token {
                            if let AuthError::InvalidCredentials = e {
                                return srv.login_with_error("invalid credentials".to_owned());
                            }
                        }
                        token.map_err(|e| ServerError::from(e).rejection())
                    }),
            ),
        )
    }

    fn with_server(
        srv: Server,
    ) -> impl Filter<Extract = (Server,), Error = std::convert::Infallible> + Clone {
        warp::any().map(move || srv.clone())
    }

    fn profile(&self) -> impl Filter<Extract = impl Reply, Error = Rejection> + Clone {
        warp::get().and(
            warp::path!("@" / String)
                .and(Self::with_server(self.clone()))
                .and_then(|username: String, srv: Server| async move {
                    srv.hb
                        .render(
                            "profile",
                            &serde_json::json!(srv
                                .profiler
                                .profile(username)
                                .await
                                .map_err(|e| ServerError::from(e))?),
                        )
                        .map(|html| warp::reply::html(html))
                        .map_err(|e| ServerError::from(e).rejection())
                }),
        )
    }

    fn create_profile(&self) -> impl Filter<Extract = impl Reply, Error = Rejection> + Clone {
        warp::post().and(
            warp::body::content_length_limit(8192).and(
                warp::path!("@" / String)
                    .and(Self::with_server(self.clone()))
                    .and(warp::body::form())
                    .and_then(
                        |username: String, srv: Server, body: CreateProfileRequest| async move {
                            if body.password_hash.len() == 0 {
                                return Err(ServerError::BadRequest(
                                    "cannot have an empty password".to_owned(),
                                )
                                .rejection());
                            }
                            let user = srv
                                .profiler
                                .create_user(username, body.password_hash)
                                .await
                                .map_err(|e| ServerError::from(e));
                            match user {
                                Ok(u) => Ok(warp::redirect(
                                    Uri::from_str(format!("/@/{}", u.username).as_str()).unwrap(),
                                )),
                                Err(e) => Err(e.rejection()),
                            }
                        },
                    ),
            ),
        )
    }

    fn static_files() -> impl Filter<Extract = impl Reply, Error = Rejection> + Clone {
        warp::get().and(warp::path("static").and(warp::path::tail()).and_then(
            |path: Tail| async move {
                let asset = match StaticData::get(path.as_str()) {
                    Some(a) => a,
                    None => return Err(ServerError::NotFound.rejection()),
                };
                let mime = mime_guess::from_path(path.as_str()).first_or_octet_stream();

                let mut res = Response::new(asset.data.into());
                res.headers_mut().insert(
                    "Content-Type",
                    HeaderValue::from_str(mime.as_ref()).unwrap(),
                );
                Ok(res)
            },
        ))
    }
}