package ricefs

import (
	"io"
	"os"

	"github.com/GeertJohan/go.rice"

	"github.com/spf13/afero"
)

var _ afero.File = &file{}

type file struct {
	f    *rice.File
	info os.FileInfo
}

func (f *file) Close() error { return f.f.Close() }

func (f *file) Read(p []byte) (int, error) { return f.f.Read(p) }

func (f *file) ReadAt(p []byte, off int64) (int, error) {
	_, err := f.Seek(off, io.SeekStart)
	if nil != err {
		return 0, err
	}
	return f.Read(p)
}

func (f *file) Seek(off int64, whence int) (int64, error) { return f.f.Seek(off, whence) }

func (f *file) Write(p []byte) (int, error) { return 0, ErrReadOnly }

func (f *file) WriteAt(p []byte, off int64) (int, error) { return 0, ErrReadOnly }

func (f *file) Name() string {
	i, err := f.Stat()
	if nil != err {
		return ""
	}
	return i.Name()
}

func (f *file) Readdir(n int) ([]os.FileInfo, error) { return f.f.Readdir(n) }

func (f *file) Readdirnames(n int) ([]string, error) {
	var dirs, err = f.Readdir(n)
	if nil != err {
		return nil, err
	}
	var names = make([]string, len(dirs))
	for i, dir := range dirs {
		names[i] = dir.Name()
	}
	return names, nil
}

func (f *file) Stat() (os.FileInfo, error) {
	if nil == f.info {
		i, err := f.f.Stat()
		if nil != err {
			return nil, err
		}
		f.info = i
	}
	return f.info, nil
}

func (f *file) Sync() error { return ErrReadOnly }

func (f *file) Truncate(size int64) error { return ErrReadOnly }

func (f *file) WriteString(s string) (int, error) { return 0, ErrReadOnly }