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//! Contains the `Request` class, used for building requests to the API.

use reqwest::blocking::{
    RequestBuilder
};

#[cfg(feature = "async")]
use reqwest::{
    RequestBuilder as ARequestBuilder
};

use reqwest::{
    header::{
        HeaderMap,
        USER_AGENT, AUTHORIZATION, CONTENT_TYPE, CONTENT_LENGTH,
        HeaderValue,
    },
    Url,
    Method,
};
use crate::error::{Result, Error};
use crate::http::Client;
use crate::constants::USER_AGENT as B_API_USER_AGENT;


/// A struct representing a request to some endpoint.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Request<'a> {

    /// The body of the request. (Note that this is rarely, if ever, used in this lib.)
    pub body: Option<&'a [u8]>,

    /// The headers of the request.
    pub headers: Option<HeaderMap>,

    /// The endpoint (e.g. /players/%23sometag).
    pub endpoint: String,

    /// The method (GET/POST/...). Defaults to GET
    pub method: Method,
}

impl<'a> Default for Request<'a> {
    /// Returns a default `Request` instance, with initial values.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use brawl_api::http::request::Request;
    /// use reqwest::Method;
    ///
    /// assert_eq!(
    ///     Request::default(),
    ///     Request {
    ///         body: None,
    ///         headers: None,
    ///         endpoint: String::from(""),
    ///         method: Method::GET,
    ///     }
    /// )
    /// ```
    fn default() -> Request<'a> {
        Request {
            body: None,
            headers: None,
            endpoint: String::from(""),
            method: Method::GET,
        }
    }
}

// (Credits to Serenity lib for the useful HTTP bases)
impl<'a> Request<'a> {
    /// (For sync usage) Creates a (blocking) [`RequestBuilder`] (`reqwest` crate) instance.
    ///
    /// [`RequestBuilder`]: https://docs.rs/reqwest/*/reqwest/blocking/struct.RequestBuilder.html
    pub fn build(&'a self, client: &Client) -> Result<RequestBuilder> {
        let Request {
            body,
            headers: ref r_headers,
            endpoint: ref r_endpoint,
            ref method,
        } = *self;

        let mut builder = client.inner.request(
            method.clone(),
            Url::parse(r_endpoint).map_err(Error::Url)?,
        );

        if let Some(ref bytes) = body {  // body was provided
            let b_vec = Vec::from(*bytes);
            builder = builder.body(b_vec);
        }

        let key = &client.auth_key;

        let key = if key.starts_with("Bearer ") {
            key.clone()
        } else {
            format!("Bearer {}", key)
        };

        let mut headers = HeaderMap::with_capacity(3);
        headers.insert(USER_AGENT, HeaderValue::from_static(&B_API_USER_AGENT));
        headers.insert(AUTHORIZATION,
                       HeaderValue::from_str(&key).map_err(Error::Authorization)?);
        headers.insert(CONTENT_TYPE, HeaderValue::from_static(&"application/json"));
        headers.insert(CONTENT_LENGTH, HeaderValue::from_static(&"0"));

        if let Some(ref r_headers) = r_headers {
            headers.extend(r_headers.clone());
        }

        builder = builder.headers(headers);

        Ok(builder)
    }

    /// (For async usage) Creates a (non-blocking) [`RequestBuilder`] (`reqwest` crate) instance.
    ///
    /// [`RequestBuilder`]: https://docs.rs/reqwest/*/reqwest/struct.RequestBuilder.html
    #[cfg(feature = "async")]
    pub fn a_build(&'a self, client: &Client) -> Result<ARequestBuilder> {
        let Request {
            body,
            headers: ref r_headers,
            endpoint: ref r_endpoint,
            ref method,
        } = *self;

        let mut builder = client.a_inner.request(
            method.clone(),
            Url::parse(r_endpoint).map_err(Error::Url)?,
        );

        if let Some(ref bytes) = body {  // body was provided
            let b_vec = Vec::from(*bytes);
            builder = builder.body(b_vec);
        }

        let key = &client.auth_key;

        let key = if key.starts_with("Bearer ") {
            key.clone()
        } else {
            format!("Bearer {}", key)  // add "Bearer " if missing.
        };

        let mut headers = HeaderMap::with_capacity(3);
        headers.insert(USER_AGENT, HeaderValue::from_static(&B_API_USER_AGENT));
        headers.insert(AUTHORIZATION,
                       HeaderValue::from_str(&key).map_err(Error::Authorization)?);
        headers.insert(CONTENT_TYPE, HeaderValue::from_static(&"application/json"));
        headers.insert(CONTENT_LENGTH, HeaderValue::from_static(&"0"));

        if let Some(ref r_headers) = r_headers {
            headers.extend(r_headers.clone());
        }

        builder = builder.headers(headers);

        Ok(builder)
    }
}