/*
 * MinIO Cloud Storage, (C) 2016-2020 MinIO, Inc.
 *
 * 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.
 */

package cmd

import (
	"os"
	"time"
)

// VolInfo - represents volume stat information.
type VolInfo struct {
	// Name of the volume.
	Name string

	// Date and time when the volume was created.
	Created time.Time
}

// FilesInfo represent a list of files, additionally
// indicates if the list is last.
type FilesInfo struct {
	Files       []FileInfo
	IsTruncated bool
}

// FilesInfoVersions represents a list of file versions,
// additionally indicates if the list is last.
type FilesInfoVersions struct {
	FilesVersions []FileInfoVersions
	IsTruncated   bool
}

// FileInfoVersions represent a list of versions for a given file.
type FileInfoVersions struct {
	// Name of the volume.
	Volume string

	// Name of the file.
	Name string

	// Represents the latest mod time of the
	// latest version.
	LatestModTime time.Time

	Versions []FileInfo
}

// forwardPastVersion will truncate the result to only contain versions after 'v'.
// If v is empty or the version isn't found no changes will be made.
func (f *FileInfoVersions) forwardPastVersion(v string) {
	if v == "" {
		return
	}
	for i, ver := range f.Versions {
		if ver.VersionID == v {
			f.Versions = f.Versions[i+1:]
			return
		}
	}
}

// FileInfo - represents file stat information.
type FileInfo struct {
	// Name of the volume.
	Volume string

	// Name of the file.
	Name string

	// Version of the file.
	VersionID string

	// Indicates if the version is the latest
	IsLatest bool

	// Deleted is set when this FileInfo represents
	// a deleted marker for a versioned bucket.
	Deleted bool

	// DataDir of the file
	DataDir string

	// Indicates if this object is still in V1 format.
	XLV1 bool

	// Date and time when the file was last modified, if Deleted
	// is 'true' this value represents when while was deleted.
	ModTime time.Time

	// Total file size.
	Size int64

	// File mode bits.
	Mode os.FileMode

	// File metadata
	Metadata map[string]string

	// All the parts per object.
	Parts []ObjectPartInfo

	// Erasure info for all objects.
	Erasure ErasureInfo
}

// newFileInfo - initializes new FileInfo, allocates a fresh erasure info.
func newFileInfo(object string, dataBlocks, parityBlocks int) (fi FileInfo) {
	fi.Erasure = ErasureInfo{
		Algorithm:    erasureAlgorithm,
		DataBlocks:   dataBlocks,
		ParityBlocks: parityBlocks,
		BlockSize:    blockSizeV1,
		Distribution: hashOrder(object, dataBlocks+parityBlocks),
	}
	return fi
}