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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

//! Code for applying endpoints to a request.

use aws_smithy_runtime_api::client::endpoint::{error::InvalidEndpointError, EndpointPrefix};
use std::borrow::Cow;
use std::result::Result as StdResult;
use std::str::FromStr;

/// Apply `endpoint` to `uri`
///
/// This method mutates `uri` by setting the `endpoint` on it
pub fn apply_endpoint(
    uri: &mut http_02x::Uri,
    endpoint: &http_02x::Uri,
    prefix: Option<&EndpointPrefix>,
) -> StdResult<(), InvalidEndpointError> {
    let prefix = prefix.map(EndpointPrefix::as_str).unwrap_or("");
    let authority = endpoint
        .authority()
        .as_ref()
        .map(|auth| auth.as_str())
        .unwrap_or("");
    let authority = if !prefix.is_empty() {
        Cow::Owned(format!("{}{}", prefix, authority))
    } else {
        Cow::Borrowed(authority)
    };
    let authority = http_02x::uri::Authority::from_str(&authority).map_err(|err| {
        InvalidEndpointError::failed_to_construct_authority(authority.into_owned(), err)
    })?;
    let scheme = *endpoint
        .scheme()
        .as_ref()
        .ok_or_else(InvalidEndpointError::endpoint_must_have_scheme)?;
    let new_uri = http_02x::Uri::builder()
        .authority(authority)
        .scheme(scheme.clone())
        .path_and_query(merge_paths(endpoint, uri).as_ref())
        .build()
        .map_err(InvalidEndpointError::failed_to_construct_uri)?;
    *uri = new_uri;
    Ok(())
}

fn merge_paths<'a>(endpoint: &'a http_02x::Uri, uri: &'a http_02x::Uri) -> Cow<'a, str> {
    if let Some(query) = endpoint.path_and_query().and_then(|pq| pq.query()) {
        tracing::warn!(query = %query, "query specified in endpoint will be ignored during endpoint resolution");
    }
    let endpoint_path = endpoint.path();
    let uri_path_and_query = uri.path_and_query().map(|pq| pq.as_str()).unwrap_or("");
    if endpoint_path.is_empty() {
        Cow::Borrowed(uri_path_and_query)
    } else {
        let ep_no_slash = endpoint_path.strip_suffix('/').unwrap_or(endpoint_path);
        let uri_path_no_slash = uri_path_and_query
            .strip_prefix('/')
            .unwrap_or(uri_path_and_query);
        Cow::Owned(format!("{}/{}", ep_no_slash, uri_path_no_slash))
    }
}