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use std::ops::Deref;

use reqwest::header::{HeaderMap, HeaderValue, InvalidHeaderValue};

/// Errors that may occur when creating a new [`Client`].
#[derive(Debug, thiserror::Error)]
#[allow(clippy::module_name_repetitions)]
pub enum ClientError {
    /// The provided access key is not a valid header value.
    #[error("failed to set access key header: {0}")]
    AccessKey(#[from] InvalidHeaderValue),
    /// Failed to build the [`Client`] for some reason.
    #[error("failed to build client: {0}")]
    BuildClient(#[from] reqwest::Error),
}

/// API Client initialized with an API access key.
#[derive(Debug)]
pub struct Client(reqwest::Client);

impl Client {
    /// Create a new `Client` using the given access key.
    ///
    /// The client is configured to always use HTTPS.
    ///
    /// # Errors
    ///
    /// See [`ClientError`].
    pub fn new(access_key: &str) -> Result<Self, ClientError> {
        let access_key = HeaderValue::from_str(access_key)?;
        let mut headers = HeaderMap::with_capacity(1);
        headers.insert("AccessKey", access_key);
        let inner = reqwest::Client::builder()
            .default_headers(headers)
            .https_only(true)
            .build()?;
        Ok(Self(inner))
    }
}

impl Deref for Client {
    type Target = reqwest::Client;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}