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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 super::core::*;
use super::error::parse_error;
use crate::raw::oio::BatchDeleteResult;
use crate::raw::*;
use crate::*;
use http::StatusCode;
use std::sync::Arc;

pub struct GcsDeleter {
    core: Arc<GcsCore>,
}

impl GcsDeleter {
    pub fn new(core: Arc<GcsCore>) -> Self {
        Self { core }
    }
}

impl oio::BatchDelete for GcsDeleter {
    async fn delete_once(&self, path: String, _: OpDelete) -> Result<()> {
        let resp = self.core.gcs_delete_object(&path).await?;

        // deleting not existing objects is ok
        if resp.status().is_success() || resp.status() == StatusCode::NOT_FOUND {
            Ok(())
        } else {
            Err(parse_error(resp))
        }
    }

    async fn delete_batch(&self, batch: Vec<(String, OpDelete)>) -> Result<BatchDeleteResult> {
        let paths: Vec<String> = batch.into_iter().map(|(p, _)| p).collect();
        let resp = self.core.gcs_delete_objects(paths.clone()).await?;

        let status = resp.status();

        // If the overall request isn't formatted correctly and Cloud Storage is unable to parse it into sub-requests, you receive a 400 error.
        // Otherwise, Cloud Storage returns a 200 status code, even if some or all of the sub-requests fail.
        if status != StatusCode::OK {
            return Err(parse_error(resp));
        }

        let boundary = parse_multipart_boundary(resp.headers())?.ok_or_else(|| {
            Error::new(
                ErrorKind::Unexpected,
                "gcs batch delete response content type is empty",
            )
        })?;
        let multipart: Multipart<MixedPart> = Multipart::new()
            .with_boundary(boundary)
            .parse(resp.into_body().to_bytes())?;
        let parts = multipart.into_parts();

        let mut batched_result = BatchDeleteResult::default();

        for (i, part) in parts.into_iter().enumerate() {
            let resp = part.into_response();
            // TODO: maybe we can take it directly?
            let path = paths[i].clone();

            // deleting not existing objects is ok
            if resp.status().is_success() || resp.status() == StatusCode::NOT_FOUND {
                batched_result.succeeded.push((path, OpDelete::default()));
            } else {
                batched_result
                    .failed
                    .push((path, OpDelete::default(), parse_error(resp)));
            }
        }

        // If no object is deleted, return directly.
        if batched_result.succeeded.is_empty() {
            let err = batched_result.failed.remove(0).2;
            return Err(err);
        }

        Ok(batched_result)
    }
}