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use error::{Error, ErrorObject, RequestError};
use reqwest;
use reqwest::RequestBuilder;
use reqwest::header::{
    HeaderMap, HeaderName, HeaderValue, AUTHORIZATION,
};
use serde;
use serde_json as json;
use std::io::Read;

#[derive(Clone, Default)]
pub struct Params {
    pub stripe_account: Option<String>,
    pub client_id: Option<String>,
}

#[derive(Clone)]
pub struct Client {
    client: reqwest::Client,
    secret_key: String,
    params: Params,
}

impl Client {
    fn url(path: &str) -> String {
        format!("https://api.stripe.com/v1/{}", &path[1..])
    }

    pub fn new<Str: Into<String>>(secret_key: Str) -> Client {
        let client = reqwest::Client::new();
        Client {
            client: client,
            secret_key: secret_key.into(),
            params: Params::default(),
        }
    }

    /// Clones a new client with different params.
    ///
    /// This is the recommended way to send requests for many different Stripe accounts
    /// or with different Meta, Extra, and Expand params while using the same secret key.
    pub fn with(&self, params: Params) -> Client {
        let mut client = self.clone();
        client.params = params;
        client
    }

    /// Sets a value for the Stripe-Account header
    ///
    /// This is recommended if you are acting as only one Account for the lifetime of the client.
    /// Otherwise, prefer `client.with(Params{stripe_account: "acct_ABC", ..})`.
    pub fn set_stripe_account<Str: Into<String>>(&mut self, account_id: Str) {
        self.params.stripe_account = Some(account_id.into());
    }

    pub fn get<T: serde::de::DeserializeOwned>(&self, path: &str) -> Result<T, Error> {
        let url = Client::url(path);
        let request = self.client.get(&url).headers(self.headers());
        send(request)
    }

    pub fn post<T: serde::de::DeserializeOwned, P: serde::Serialize>(
        &self,
        path: &str,
        params: P,
    ) -> Result<T, Error> {
        let url = Client::url(path);
        let request = self.client.post(&url).headers(self.headers()).form(&params);
        send(request)
    }

    pub fn post_empty<T: serde::de::DeserializeOwned>(&self, path: &str) -> Result<T, Error> {
        let url = Client::url(path);
        let request = self.client.post(&url).headers(self.headers());
        send(request)
    }

    pub fn delete<T: serde::de::DeserializeOwned>(&self, path: &str) -> Result<T, Error> {
        let url = Client::url(path);
        let request = self.client.delete(&url).headers(self.headers());
        send(request)
    }

    fn headers(&self) -> HeaderMap {
        let mut headers = HeaderMap::new();
        headers.insert(
            AUTHORIZATION,
            HeaderValue::from_str(&format!("Bearer {}", self.secret_key)).unwrap(),
        );
        if let Some(ref account) = self.params.stripe_account {
            headers.insert(
                HeaderName::from_static("stripe-account"),
                HeaderValue::from_str(account).unwrap(),
            );
        }
        if let Some(ref client_id) = self.params.client_id {
            headers.insert(
                HeaderName::from_static("client-id"),
                HeaderValue::from_str(client_id).unwrap(),
            );
        }
        headers
    }
}

fn send<T: serde::de::DeserializeOwned>(request: RequestBuilder) -> Result<T, Error> {
    let mut response = request.send()?;
    let mut body = String::with_capacity(4096);
    response.read_to_string(&mut body)?;

    let status = response.status();
    if !status.is_success() {
        let mut err = json::from_str(&body).unwrap_or_else(|err| {
            let mut req = ErrorObject {
                error: RequestError::default(),
            };
            req.error.message = Some(format!("failed to deserialize error: {}", err));
            req
        });
        err.error.http_status = status.as_u16();
        return Err(Error::from(err.error));
    }

    json::from_str(&body).map_err(|err| Error::from(err))
}