package vfscommon

import (
	"os"
	"runtime"
	"time"

	"github.com/rclone/rclone/fs"
)

// Options is options for creating the vfs
type Options struct {
	NoSeek            bool          // don't allow seeking if set
	NoChecksum        bool          // don't check checksums if set
	ReadOnly          bool          // if set VFS is read only
	NoModTime         bool          // don't read mod times for files
	DirCacheTime      time.Duration // how long to consider directory listing cache valid
	PollInterval      time.Duration
	Umask             int
	UID               uint32
	GID               uint32
	DirPerms          os.FileMode
	FilePerms         os.FileMode
	ChunkSize         fs.SizeSuffix // if > 0 read files in chunks
	ChunkSizeLimit    fs.SizeSuffix // if > ChunkSize double the chunk size after each chunk until reached
	CacheMode         CacheMode
	CacheMaxAge       time.Duration
	CacheMaxSize      fs.SizeSuffix
	CachePollInterval time.Duration
	CaseInsensitive   bool
	WriteWait         time.Duration // time to wait for in-sequence write
	ReadWait          time.Duration // time to wait for in-sequence read
	WriteBack         time.Duration // time to wait before writing back dirty files
	ReadAhead         fs.SizeSuffix // bytes to read ahead in cache mode "full"
	UsedIsSize        bool          // if true, use the `rclone size` algorithm for Used size
}

// DefaultOpt is the default values uses for Opt
var DefaultOpt = Options{
	NoModTime:         false,
	NoChecksum:        false,
	NoSeek:            false,
	DirCacheTime:      5 * 60 * time.Second,
	PollInterval:      time.Minute,
	ReadOnly:          false,
	Umask:             0,
	UID:               ^uint32(0), // these values instruct WinFSP-FUSE to use the current user
	GID:               ^uint32(0), // overridden for non windows in mount_unix.go
	DirPerms:          os.FileMode(0777),
	FilePerms:         os.FileMode(0666),
	CacheMode:         CacheModeOff,
	CacheMaxAge:       3600 * time.Second,
	CachePollInterval: 60 * time.Second,
	ChunkSize:         128 * fs.MebiByte,
	ChunkSizeLimit:    -1,
	CacheMaxSize:      -1,
	CaseInsensitive:   runtime.GOOS == "windows" || runtime.GOOS == "darwin", // default to true on Windows and Mac, false otherwise
	WriteWait:         1000 * time.Millisecond,
	ReadWait:          20 * time.Millisecond,
	WriteBack:         5 * time.Second,
	ReadAhead:         0 * fs.MebiByte,
	UsedIsSize:        false,
}