// Copyright 2023 RisingWave Labs
//
// Licensed 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 std::sync::Arc;

use opendal::Operator;
use opendal::layers::LoggingLayer;
use opendal::services::Gcs;
use risingwave_common::config::ObjectStoreConfig;

use super::{MediaType, OpendalObjectStore, new_operator};
use crate::object::ObjectResult;
use crate::object::object_metrics::ObjectStoreMetrics;

impl OpendalObjectStore {
    /// create opendal gcs engine.
    pub fn new_gcs_engine(
        bucket: String,
        root: String,
        config: Arc<ObjectStoreConfig>,
        metrics: Arc<ObjectStoreMetrics>,
    ) -> ObjectResult<Self> {
        // Create gcs backend builder.
        let mut builder = Gcs::default().bucket(&bucket).root(&root);

        // if credential env is set, use it. Otherwise, ADC will be used.
        let cred = std::env::var("GOOGLE_APPLICATION_CREDENTIALS");
        if let Ok(cred) = cred {
            builder = builder.credential(&cred);
        }

        let op = new_operator(
            &config,
            Operator::new(builder)?.layer(LoggingLayer::default()),
        );

        Ok(Self {
            op,
            media_type: MediaType::Gcs,
            config,
            metrics,
        })
    }
}
