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use crate::{
    client::Client,
    error::Error,
    request::{Request, TryIntoRequest},
    response::{Response, ResponseFuture},
    routing::Route,
};
use std::future::IntoFuture;
use twilight_model::{
    channel::Webhook,
    id::{marker::WebhookMarker, Id},
};

struct GetWebhookFields<'a> {
    token: Option<&'a str>,
}

/// Get a webhook by ID.
#[must_use = "requests must be configured and executed"]
pub struct GetWebhook<'a> {
    fields: GetWebhookFields<'a>,
    http: &'a Client,
    id: Id<WebhookMarker>,
}

impl<'a> GetWebhook<'a> {
    pub(crate) const fn new(http: &'a Client, id: Id<WebhookMarker>) -> Self {
        Self {
            fields: GetWebhookFields { token: None },
            http,
            id,
        }
    }

    /// Specify the token for auth, if not already authenticated with a Bot
    /// token.
    pub const fn token(mut self, token: &'a str) -> Self {
        self.fields.token = Some(token);

        self
    }

    /// Execute the request, returning a future resolving to a [`Response`].
    #[deprecated(since = "0.14.0", note = "use `.await` or `into_future` instead")]
    pub fn exec(self) -> ResponseFuture<Webhook> {
        self.into_future()
    }
}

impl IntoFuture for GetWebhook<'_> {
    type Output = Result<Response<Webhook>, Error>;

    type IntoFuture = ResponseFuture<Webhook>;

    fn into_future(self) -> Self::IntoFuture {
        let http = self.http;

        match self.try_into_request() {
            Ok(request) => http.request(request),
            Err(source) => ResponseFuture::error(source),
        }
    }
}

impl TryIntoRequest for GetWebhook<'_> {
    fn try_into_request(self) -> Result<Request, Error> {
        let mut request = Request::builder(&Route::GetWebhook {
            token: self.fields.token,
            webhook_id: self.id.get(),
        });

        let use_webhook_token = self.fields.token.is_some();

        // If a webhook token has been configured, then we don't need to use
        // the client's authorization token.
        if use_webhook_token {
            request = request.use_authorization_token(false);
        }

        Ok(request.build())
    }
}