//go:build linux || darwin
// +build linux darwin

// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
//	http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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.

package fs

import (
	"golang.org/x/sys/unix"
)

// Info linux returns (available bytes, byte capacity, byte usage, total inodes, inodes free, inode usage, error)
// for the filesystem that path resides upon.
func Info(path string) (
	available int64, capacity int64, used int64,
	totalInodes int64, freeInodes int64, usedInodes int64,
	err error,
) {
	statfs := &unix.Statfs_t{}
	err = unix.Statfs(path, statfs)
	if err != nil {
		available = 0
		capacity = 0
		used = 0

		totalInodes = 0
		freeInodes = 0
		usedInodes = 0
		return
	}

	// Available is blocks available * fragment size
	available = int64(statfs.Bavail) * int64(statfs.Bsize)
	// Capacity is total block count * fragment size
	capacity = int64(statfs.Blocks) * int64(statfs.Bsize)
	// Used is block being used * fragment size (aka block size).
	used = (int64(statfs.Blocks) - int64(statfs.Bfree)) * int64(statfs.Bsize)

	totalInodes = int64(statfs.Files)
	freeInodes = int64(statfs.Ffree)
	usedInodes = totalInodes - freeInodes
	return
}