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use super::EventLoop;
use crate::{
    errors, internal::BoxFuture, prelude::*, types::parameters::Updates, Bot,
};
use futures::{future::Either, Stream};
use hyper::{
    client::connect::Connect, service::service_fn, Body, Method, Request,
    Response, Server,
};
use std::{
    net::{IpAddr, Ipv4Addr, SocketAddr},
    sync::Arc,
    time::Duration,
};
use tokio::util::FutureExt;

/// Configures webhook and starts a server.
///
/// To construct a `Webhook`, use [`Bot::webhook`].
///
/// [`Bot::webhook`]: ./struct.Bot.html#method.webhook
#[must_use = "webhook does not start unless `start` is called"]
pub struct Webhook<'a, C> {
    event_loop: EventLoop<C>,
    ip: IpAddr,
    port: u16,
    request_timeout: Duration,

    url: &'a str,
    certificate: Option<&'a str>,
    max_connections: Option<u8>,
    allowed_updates: Option<&'a [Updates]>,
}

impl<'a, C> Webhook<'a, C> {
    pub(crate) fn new(
        event_loop: EventLoop<C>,
        url: &'a str,
        port: u16,
    ) -> Self {
        Self {
            event_loop,
            ip: IpAddr::V4(Ipv4Addr::LOCALHOST),
            port,
            request_timeout: Duration::from_secs(60),

            url,
            certificate: None,
            max_connections: None,
            allowed_updates: None,
        }
    }

    /// Configures the IP `tbot` will bind to.
    pub const fn ip(mut self, ip: IpAddr) -> Self {
        self.ip = ip;
        self
    }

    /// Configures `certificate`.
    pub fn certificate(mut self, certificate: &'a str) -> Self {
        self.certificate = Some(certificate);
        self
    }

    /// Configures `max_connections`.
    pub fn max_connections(mut self, max: u8) -> Self {
        self.max_connections = Some(max);
        self
    }

    /// Configures `allowed_updates`.
    pub fn allowed_updates(mut self, updates: &'a [Updates]) -> Self {
        self.allowed_updates = Some(updates);
        self
    }

    /// Configures for how long `tbot` should wait for `setWebhook`. If you
    /// don't configure this value, it is set to `60s`.
    pub const fn request_timeout(mut self, timeout: Duration) -> Self {
        self.request_timeout = timeout;
        self
    }
}

impl<'a, C> Webhook<'a, C>
where
    C: Connect + Clone + Sync + 'static,
    C::Transport: 'static,
    C::Future: 'static,
{
    /// Starts the server.
    pub fn start(self) -> ! {
        crate::run(self.into_future().map_err(|err| {
            eprintln!("\n[tbot] Webhook error: {:#?}", err);
        }));

        panic!(
            "\n[tbot] The webhook server unexpectedly returned. \
             An error should be printed above.\n",
        );
    }
}

impl<'a, C> IntoFuture for Webhook<'a, C>
where
    C: Connect + Clone + Sync + 'static,
    C::Transport: 'static,
    C::Future: 'static,
{
    type Future = BoxFuture<Self::Item, Self::Error>;
    type Item = ();
    type Error = errors::Webhook;

    fn into_future(self) -> Self::Future {
        let set_webhook = self
            .event_loop
            .bot
            .set_webhook(
                self.url,
                self.certificate,
                self.max_connections,
                self.allowed_updates,
            )
            .into_future()
            .timeout(self.request_timeout)
            .map_err(errors::Webhook::SetWebhook);

        let Self {
            event_loop,
            ip,
            port,
            ..
        } = self;

        Box::new(set_webhook.and_then(move |_| {
            init_server(event_loop, ip, port).map_err(errors::Webhook::Server)
        }))
    }
}

fn is_request_correct(request: &Request<Body>) -> bool {
    let content_type = request.headers().get("Content-Type");

    request.method() == Method::POST
        && request.uri() == "/"
        && content_type.map(|x| x == "application/json") == Some(true)
}

fn handle<C>(
    bot: Arc<Bot<C>>,
    event_loop: Arc<EventLoop<C>>,
    request: Request<Body>,
) -> impl Future<Item = Response<Body>, Error = hyper::Error>
where
    C: Send + Sync + 'static,
{
    if is_request_correct(&request) {
        let body = request.into_body().concat2();
        let handler = body.map(move |body| {
            let update =
                serde_json::from_slice(&body[..]).unwrap_or_else(|error| {
                    panic!("\n[tbot] Received invalid JSON: {:#?}\n", error);
                });

            event_loop.handle_update(bot, update);

            Response::new(Body::empty())
        });

        Either::A(handler)
    } else {
        let response = Response::new(Body::empty());
        let future = futures::future::ok(response);

        Either::B(future)
    }
}

fn init_server<C>(
    event_loop: EventLoop<C>,
    ip: IpAddr,
    port: u16,
) -> impl Future<Item = (), Error = hyper::Error>
where
    C: Clone + Send + Sync + 'static,
{
    let bot = Arc::new(event_loop.bot.clone());
    let event_loop = Arc::new(event_loop);
    let addr = SocketAddr::new(ip, port);

    Server::bind(&addr).serve(move || {
        let bot = Arc::clone(&bot);
        let event_loop = Arc::clone(&event_loop);
        service_fn(move |request| {
            handle(Arc::clone(&bot), Arc::clone(&event_loop), request)
        })
    })
}