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// Copyright 2020 John Millikin and the rust-fuse contributors.
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0

use crate::protocol::node;
use crate::protocol::prelude::*;

#[cfg(test)]
mod getattr_test;

// GetattrRequest {{{

/// Request type for [`FuseHandlers::getattr`].
///
/// [`FuseHandlers::getattr`]: ../trait.FuseHandlers.html#method.getattr
pub struct GetattrRequest {
	node_id: node::NodeId,
	handle: Option<u64>,
}

impl GetattrRequest {
	pub fn node_id(&self) -> node::NodeId {
		self.node_id
	}

	pub fn handle(&self) -> Option<u64> {
		self.handle
	}
}

impl<'a> fuse_io::DecodeRequest<'a> for GetattrRequest {
	fn decode_request(
		mut dec: fuse_io::RequestDecoder<'a>,
	) -> io::Result<Self> {
		let header = dec.header();
		debug_assert!(header.opcode == fuse_kernel::FUSE_GETATTR);

		let node_id = try_node_id(header.nodeid)?;

		// FUSE versions before v7.9 had no request type for `getattr()`.
		if dec.version().minor() < 9 {
			return Ok(Self {
				node_id,
				handle: None,
			});
		}

		let raw: &'a fuse_kernel::fuse_getattr_in = dec.next_sized()?;
		let mut handle = None;
		if (raw.getattr_flags & fuse_kernel::FUSE_GETATTR_FH) > 0 {
			handle = Some(raw.fh);
		}
		Ok(Self { node_id, handle })
	}
}

// }}}

// GetattrResponse {{{

/// Response type for [`FuseHandlers::getattr`].
///
/// [`FuseHandlers::getattr`]: ../trait.FuseHandlers.html#method.getattr
pub struct GetattrResponse<'a> {
	phantom: PhantomData<&'a ()>,
	raw: fuse_kernel::fuse_attr_out,
}

impl GetattrResponse<'_> {
	pub fn new() -> Self {
		GetattrResponse {
			phantom: PhantomData,
			raw: fuse_kernel::fuse_attr_out {
				attr_valid: 0,
				attr_valid_nsec: 0,
				dummy: 0,
				attr: Default::default(),
			},
		}
	}

	pub fn node_id(&self) -> Option<node::NodeId> {
		node::NodeId::new(self.raw.attr.ino)
	}

	pub fn set_node_id(&mut self, node_id: node::NodeId) {
		self.raw.attr.ino = node_id.get();
	}

	pub fn attr(&self) -> &node::NodeAttr {
		node::NodeAttr::new_ref(&self.raw.attr)
	}

	pub fn attr_mut(&mut self) -> &mut node::NodeAttr {
		node::NodeAttr::new_ref_mut(&mut self.raw.attr)
	}

	pub fn cache_duration(&self) -> Duration {
		Duration::new(self.raw.attr_valid, self.raw.attr_valid_nsec)
	}

	pub fn set_cache_duration(&mut self, cache_duration: Duration) {
		self.raw.attr_valid = cache_duration.as_secs();
		self.raw.attr_valid_nsec = cache_duration.subsec_nanos();
	}
}

impl fmt::Debug for GetattrResponse<'_> {
	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
		fmt.debug_struct("GetattrResponse")
			.field("attr", self.attr())
			.field("cache_duration", &self.cache_duration())
			.finish()
	}
}

impl fuse_io::EncodeResponse for GetattrResponse<'_> {
	fn encode_response<'a, Chan: fuse_io::Channel>(
		&'a self,
		enc: fuse_io::ResponseEncoder<Chan>,
	) -> std::io::Result<()> {
		// The `fuse_attr::blksize` field was added in FUSE v7.9.
		if enc.version().minor() < 9 {
			let buf: &[u8] = unsafe {
				slice::from_raw_parts(
					(&self.raw as *const fuse_kernel::fuse_attr_out)
						as *const u8,
					fuse_kernel::FUSE_COMPAT_ATTR_OUT_SIZE,
				)
			};
			return enc.encode_bytes(buf);
		}

		enc.encode_sized(&self.raw)
	}
}

// }}}