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// Copyright 2022 Datafuse 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::io::Result;
use std::pin::Pin;
use std::sync::Arc;
use std::task::Context;
use std::task::Poll;

use super::Backend;
use crate::path::build_rel_path;
use crate::ObjectEntry;
use crate::ObjectMetadata;
use crate::ObjectMode;

pub struct DirStream {
    backend: Arc<Backend>,
    root: String,
    rd: hdrs::Readdir,
}

impl DirStream {
    pub fn new(backend: Arc<Backend>, root: &str, rd: hdrs::Readdir) -> Self {
        Self {
            backend,
            root: root.to_string(),
            rd,
        }
    }
}

impl futures::Stream for DirStream {
    type Item = Result<ObjectEntry>;

    fn poll_next(mut self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        match self.rd.next() {
            None => Poll::Ready(None),
            Some(de) => {
                let path = build_rel_path(&self.root, de.path());

                let d = if de.is_file() {
                    let meta = ObjectMetadata::new(ObjectMode::FILE)
                        .with_content_length(de.len())
                        .with_last_modified(time::OffsetDateTime::from(de.modified()));
                    ObjectEntry::new(self.backend.clone(), &path, meta)
                } else if de.is_dir() {
                    // Make sure we are returning the correct path.
                    ObjectEntry::new(
                        self.backend.clone(),
                        &format!("{}/", path),
                        ObjectMetadata::new(ObjectMode::DIR),
                    )
                    .with_complete()
                } else {
                    ObjectEntry::new(
                        self.backend.clone(),
                        &path,
                        ObjectMetadata::new(ObjectMode::Unknown),
                    )
                };

                Poll::Ready(Some(Ok(d)))
            }
        }
    }
}