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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.

#[cfg(not(feature = "mesalock_sgx"))]
use std::fs::File;
use std::io;
#[cfg(feature = "mesalock_sgx")]
use std::untrusted::fs::File;
use teaclave_types::StagedFiles;
use teaclave_types::TeaclaveRuntime;

pub struct RawIoRuntime {
    input_files: StagedFiles,
    output_files: StagedFiles,
}

impl RawIoRuntime {
    pub fn new(input_files: StagedFiles, output_files: StagedFiles) -> RawIoRuntime {
        RawIoRuntime {
            input_files,
            output_files,
        }
    }
}

impl TeaclaveRuntime for RawIoRuntime {
    fn open_input(&self, identifier: &str) -> anyhow::Result<Box<dyn io::Read>> {
        let file_info = self
            .input_files
            .get(identifier)
            .ok_or_else(|| anyhow::anyhow!("Invalid input file identifier."))?;
        log::debug!("open_input: {:?}", file_info.path);
        let f = File::open(&file_info.path)?;
        Ok(Box::new(f))
    }

    fn create_output(&self, identifier: &str) -> anyhow::Result<Box<dyn io::Write>> {
        let file_info = self
            .output_files
            .get(identifier)
            .ok_or_else(|| anyhow::anyhow!("Invalid output file identifier"))?;
        log::debug!("create_output: {:?}", file_info.path);
        let f = File::create(&file_info.path)?;
        Ok(Box::new(f))
    }
}