top-gg 0.1.0-alpha.0

Bindings for the top.gg API.
Documentation 
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use super::Pending;
use crate::{
    client::{self, Client},
    endpoints,
    error::Result,
    model::{Bot, SearchResponse},
};
use std::{
    collections::HashMap,
    fmt::Display,
    future::Future,
    pin::Pin,
    task::{Context, Poll},
};

/// Request to search for a list of bots given some parameters.
///
/// Refer to [`Client::get_bots`] for more information.
///
/// [`Client::get_bots`]: ../struct.Client.html#method.get_bots
pub struct SearchBots<'a> {
    client: &'a Client,
    fut: Option<Pending<'a, Result<SearchResponse<Bot>>>>,
    params: HashMap<&'static str, String>,
}

impl<'a> SearchBots<'a> {
    pub(crate) fn new(client: &'a Client) -> Self {
        Self {
            client,
            fut: None,
            params: HashMap::new(),
        }
    }

    /// The amount of bots to return, used for pagination.
    ///
    /// The maximum value is 500.
    pub fn limit(mut self, mut limit: u16) -> Self {
        if limit > 500 {
            limit = 500;
        }

        self.params.insert("limit", limit.to_string());

        self
    }

    /// The amount of bots to skip, used for pagination.
    pub fn offset(mut self, offset: u64) -> Self {
        self.params.insert("offset", offset.to_string());

        self
    }

    /// A search query string.
    pub fn search(self, query: impl Into<String>) -> Self {
        self._search(query.into())
    }

    fn _search(mut self, query: String) -> Self {
        self.params.insert("search", query);

        self
    }

    /// The field to sort by.
    pub fn sort(mut self, field: impl Display, ascending: bool) -> Self {
        let prefix = if ascending { "" } else { "-" };

        self.params.insert("sort", format!("{}{}", prefix, field));

        self
    }

    fn start(&mut self) -> Result<()> {
        let url = client::url(endpoints::bots())?;

        self.fut.replace(Box::pin(self.client.get(url)));

        Ok(())
    }
}

impl Future for SearchBots<'_> {
    type Output = Result<SearchResponse<Bot>>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        loop {
            if let Some(fut) = self.fut.as_mut() {
                return fut.as_mut().poll(cx);
            } else if let Err(why) = self.start() {
                return Poll::Ready(Err(why));
            }
        }
    }
}