package sync

import (
	"fmt"
	"s1d3sw1ped/SteamCache2/vfs"
	"sync"
)

// Ensure SyncFS implements VFS.
var _ vfs.VFS = (*SyncFS)(nil)

type SyncFS struct {
	vfs vfs.VFS
	mu  sync.RWMutex
}

func New(vfs vfs.VFS) *SyncFS {
	return &SyncFS{
		vfs: vfs,
		mu:  sync.RWMutex{},
	}
}

// Name returns the name of the file system.
func (sfs *SyncFS) Name() string {
	return fmt.Sprintf("SyncFS(%s)", sfs.vfs.Name())
}

// Size returns the total size of all files in the file system.
func (sfs *SyncFS) Size() int64 {
	sfs.mu.RLock()
	defer sfs.mu.RUnlock()

	return sfs.vfs.Size()
}

// Set sets the value of key as src.
// Setting the same key multiple times, the last set call takes effect.
func (sfs *SyncFS) Set(key string, src []byte) error {
	sfs.mu.Lock()
	defer sfs.mu.Unlock()

	return sfs.vfs.Set(key, src)
}

// Delete deletes the value of key.
func (sfs *SyncFS) Delete(key string) error {
	sfs.mu.Lock()
	defer sfs.mu.Unlock()

	return sfs.vfs.Delete(key)
}

// Get gets the value of key to dst, and returns dst no matter whether or not there is an error.
func (sfs *SyncFS) Get(key string) ([]byte, error) {
	sfs.mu.RLock()
	defer sfs.mu.RUnlock()

	return sfs.vfs.Get(key)
}

// Stat returns the FileInfo of key.
func (sfs *SyncFS) Stat(key string) (*vfs.FileInfo, error) {
	sfs.mu.RLock()
	defer sfs.mu.RUnlock()

	return sfs.vfs.Stat(key)
}

// StatAll returns the FileInfo of all keys.
func (sfs *SyncFS) StatAll() []*vfs.FileInfo {
	sfs.mu.RLock()
	defer sfs.mu.RUnlock()

	return sfs.vfs.StatAll()
}