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//! The client implementation for the reqwest HTTP client, which is async by
//! default.

use crate::auth::auth_errors::AuthErrorResponse;

use std::time::Duration;
use std::{collections::HashMap, convert::TryInto};

use reqwest::{Method, RequestBuilder};
use serde_json::Value;

use super::auth_errors::AuthError;

/// HTTP headers.
pub type Headers = HashMap<String, String>;
/// Query parameters.
pub type Query<'a> = HashMap<&'a str, &'a str>;
/// Form parameters.
pub type Form<'a> = HashMap<&'a str, &'a str>;

#[derive(Debug, Clone)]
pub struct AuthClient {
    /// reqwest needs an instance of its client to perform requests.
    client: reqwest::Client,
}

impl Default for AuthClient {
    fn default() -> Self {
        let client = reqwest::ClientBuilder::new()
            .timeout(Duration::from_secs(10))
            .build()
            // building with these options cannot fail
            .unwrap();
        Self { client }
    }
}

impl AuthClient {
    async fn request<D>(
        &self,
        method: Method,
        url: &str,
        headers: Option<&Headers>,
        add_data: D,
    ) -> Result<String, AuthError>
    where
        D: Fn(RequestBuilder) -> RequestBuilder,
    {
        let mut request = self.client.request(method.clone(), url);

        // Setting the headers, if any
        if let Some(headers) = headers {
            // The headers need to be converted into a `reqwest::HeaderMap`,
            // which won't fail as long as its contents are ASCII. This is an
            // internal function, so the condition cannot be broken by the user
            // and will always be true.
            //
            // The content-type header will be set automatically.
            let headers = headers.try_into().unwrap();

            request = request.headers(headers);
        }

        // Configuring the request for the specific type (get/post/put/delete)
        request = add_data(request);

        // Finally performing the request and handling the response
        log::info!("Making request {:?}", request);
        let response = request.send().await?;
        let status = response.status();
        let resp_text = response.text().await?;

        // Making sure that the status code is OK
        if status.is_success() {
            Ok(resp_text)
        } else {
            let resp_error = serde_json::from_str::<AuthErrorResponse>(&resp_text)?;
            Err(AuthError::ResponseError(resp_error))
        }
    }
}

impl AuthClient {
    // type Error = AuthError;

    #[inline]
    pub async fn get(
        &self,
        url: &str,
        headers: Option<&Headers>,
        query: &Query<'_>,
    ) -> Result<String, AuthError> {
        self.request(Method::GET, url, headers, |req| req.query(query))
            .await
    }

    #[inline]
    pub async fn post(
        &self,
        url: &str,
        headers: Option<&Headers>,
        query: Option<&Query<'_>>,
        payload: &Value,
    ) -> Result<String, AuthError> {
        self.request(Method::POST, url, headers, |req| {
            req.query(&query).json(payload)
        })
        .await
    }

    #[inline]
    pub async fn post_form(
        &self,
        url: &str,
        headers: Option<&Headers>,
        payload: &Form<'_>,
    ) -> Result<String, AuthError> {
        self.request(Method::POST, url, headers, |req| req.form(payload))
            .await
    }

    #[inline]
    pub async fn put(
        &self,
        url: &str,
        headers: Option<&Headers>,
        query: Option<&Query<'_>>,
        payload: &Value,
    ) -> Result<String, AuthError> {
        self.request(Method::PUT, url, headers, |req| {
            req.query(&query).json(payload)
        })
        .await
    }

    #[inline]
    pub async fn delete(
        &self,
        url: &str,
        headers: Option<&Headers>,
        payload: &Value,
    ) -> Result<String, AuthError> {
        self.request(Method::DELETE, url, headers, |req| req.json(payload))
            .await
    }
}