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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..

//! Global initialization and retrieval of command line arguments.
//!
//! On some platforms these are stored during runtime startup,
//! and on some they are retrieved from the system on demand.

use crate::ffi::OsString;
use crate::fmt;
use crate::vec;

/// Returns the command line arguments
pub fn args() -> Args {
    imp::args()
}

pub struct Args {
    iter: vec::IntoIter<OsString>,
}

impl !Send for Args {}
impl !Sync for Args {}

impl fmt::Debug for Args {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.iter.as_slice().fmt(f)
    }
}

impl Iterator for Args {
    type Item = OsString;
    fn next(&mut self) -> Option<OsString> {
        self.iter.next()
    }
    fn size_hint(&self) -> (usize, Option<usize>) {
        self.iter.size_hint()
    }
}

impl ExactSizeIterator for Args {
    fn len(&self) -> usize {
        self.iter.len()
    }
}

impl DoubleEndedIterator for Args {
    fn next_back(&mut self) -> Option<OsString> {
        self.iter.next_back()
    }
}

mod imp {
    use super::Args;
    use crate::ffi::OsString;
    use crate::os::unix::prelude::*;
    use sgx_oc::ocall;

    pub fn args() -> Args {
        Args { iter: clone().into_iter() }
    }

    fn clone() -> Vec<OsString> {
        unsafe {
            ocall::args()
                .map(|args| {
                    args.into_iter()
                        .map(|arg| OsStringExt::from_vec(arg.into_bytes()))
                        .collect()
                })
                .unwrap_or_default()
        }
    }
}