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use crate::{
    client::Client,
    error::{Error, ErrorType},
    request::{PendingOption, Request},
    routing::Route,
};
use hyper::StatusCode;
use serde::Deserialize;
use std::{
    future::Future,
    pin::Pin,
    task::{Context, Poll},
};
use twilight_model::id::GuildId;

#[derive(Deserialize)]
struct VanityUrl {
    code: String,
}

/// Get a guild's vanity url, if there is one.
pub struct GetGuildVanityUrl<'a> {
    fut: Option<PendingOption<'a>>,
    guild_id: GuildId,
    http: &'a Client,
}

impl<'a> GetGuildVanityUrl<'a> {
    pub(crate) fn new(http: &'a Client, guild_id: GuildId) -> Self {
        Self {
            fut: None,
            guild_id,
            http,
        }
    }

    fn start(&mut self) -> Result<(), Error> {
        let request = Request::from_route(Route::GetGuildVanityUrl {
            guild_id: self.guild_id.0,
        });

        self.fut.replace(Box::pin(self.http.request_bytes(request)));

        Ok(())
    }
}

impl Future for GetGuildVanityUrl<'_> {
    type Output = Result<Option<String>, Error>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        loop {
            if let Some(fut) = self.as_mut().fut.as_mut() {
                let bytes = match fut.as_mut().poll(cx) {
                    Poll::Ready(Ok(bytes)) => bytes,
                    Poll::Ready(Err(Error {
                        kind: ErrorType::Response { status, .. },
                        source: None,
                    })) if status == StatusCode::NOT_FOUND => {
                        return Poll::Ready(Ok(None));
                    }
                    Poll::Ready(Err(why)) => return Poll::Ready(Err(why)),
                    Poll::Pending => return Poll::Pending,
                };

                let mut bytes = bytes.as_ref().to_vec();
                let vanity_url =
                    crate::json::from_slice::<VanityUrl>(&mut bytes).map_err(|source| Error {
                        kind: ErrorType::Parsing {
                            body: bytes.clone(),
                        },
                        source: Some(Box::new(source)),
                    })?;

                return Poll::Ready(Ok(Some(vanity_url.code)));
            }

            if let Err(why) = self.as_mut().start() {
                return Poll::Ready(Err(why));
            }
        }
    }
}