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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use http::Response;
use http::StatusCode;
use serde::Deserialize;
use serde_json::de;

use crate::raw::*;
use crate::*;

#[derive(Default, Debug, Deserialize)]
#[serde(default, rename_all = "camelCase")]
struct GcsErrorResponse {
    error: GcsError,
}

#[derive(Default, Debug, Deserialize)]
#[serde(default, rename_all = "camelCase")]
struct GcsError {
    code: usize,
    message: String,
    errors: Vec<GcsErrorDetail>,
}

#[derive(Default, Debug, Deserialize)]
#[serde(default, rename_all = "camelCase")]
struct GcsErrorDetail {
    domain: String,
    location: String,
    location_type: String,
    message: String,
    reason: String,
}

/// Parse error response into Error.
pub(super) fn parse_error(resp: Response<Buffer>) -> Error {
    let (parts, body) = resp.into_parts();
    let bs = body.to_bytes();

    let (kind, retryable) = match parts.status {
        StatusCode::NOT_FOUND => (ErrorKind::NotFound, false),
        StatusCode::FORBIDDEN => (ErrorKind::PermissionDenied, false),
        StatusCode::PRECONDITION_FAILED | StatusCode::NOT_MODIFIED => {
            (ErrorKind::ConditionNotMatch, false)
        }
        StatusCode::TOO_MANY_REQUESTS => (ErrorKind::RateLimited, true),
        StatusCode::INTERNAL_SERVER_ERROR
        | StatusCode::BAD_GATEWAY
        | StatusCode::SERVICE_UNAVAILABLE
        | StatusCode::GATEWAY_TIMEOUT => (ErrorKind::Unexpected, true),
        _ => (ErrorKind::Unexpected, false),
    };

    let message = match de::from_slice::<GcsErrorResponse>(&bs) {
        Ok(gcs_err) => format!("{gcs_err:?}"),
        Err(_) => String::from_utf8_lossy(&bs).into_owned(),
    };

    let mut err = Error::new(kind, message);

    err = with_error_response_context(err, parts);

    if retryable {
        err = err.set_temporary();
    }

    err
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_parse_error() {
        let bs = bytes::Bytes::from(
            r#"
{
"error": {
 "errors": [
  {
   "domain": "global",
   "reason": "required",
   "message": "Login Required",
   "locationType": "header",
   "location": "Authorization"
  }
 ],
 "code": 401,
 "message": "Login Required"
 }
}
"#,
        );

        let out: GcsErrorResponse = de::from_slice(&bs).expect("must success");
        println!("{out:?}");

        assert_eq!(out.error.code, 401);
        assert_eq!(out.error.message, "Login Required");
        assert_eq!(out.error.errors[0].domain, "global");
        assert_eq!(out.error.errors[0].reason, "required");
        assert_eq!(out.error.errors[0].message, "Login Required");
        assert_eq!(out.error.errors[0].location_type, "header");
        assert_eq!(out.error.errors[0].location, "Authorization");
    }
}