package vfs

import (
	"bytes"
	"io/fs"
	"os"
	"time"
)

type File struct {
	name     string
	mode     os.FileMode
	modified time.Time
	open     bool
	data     *bytes.Buffer
}

type fileInfo struct {
	name     string
	size     int64
	modified time.Time
	mode     os.FileMode
}

func (f *File) Stat() (fs.FileInfo, error) {
	if f.open {
		return &fileInfo{
			name:     f.name,
			size:     int64(f.data.Len()),
			modified: f.modified,
			mode:     f.mode,
		}, nil
	}
	return nil, fs.ErrClosed
}

func (f *File) Read(data []byte) (int, error) {
	if f.open {
		return f.data.Read(data)
	}
	return 0, fs.ErrClosed
}

func (f *File) Close() error {
	if f.open {
		f.open = false
		return nil
	}
	return fs.ErrClosed
}

func (f fileInfo) Name() string {
	return f.name
}

func (f fileInfo) Size() int64 {
	return f.size
}

func (f fileInfo) Mode() fs.FileMode {
	return f.mode
}

func (f fileInfo) ModTime() time.Time {
	return f.modified
}

func (f fileInfo) IsDir() bool {
	return f.mode == fs.ModeDir
}

func (f fileInfo) Sys() any {
	return nil
}