package post

import (
	"fmt"
	"syscall"
)

type UnifiedPost interface {
	ID() string
	Name() string
	Author() string
	Comment() string
	Tags() []string
	Files() []string
	URL() string
	Stringer() string
	Type() string
}

// WriteAttributes writes info from post to file's metadata
func WriteAttributes(filename string, post UnifiedPost) (err error) {
	var tags string
	for _, tag := range post.Tags() {
		tags = fmt.Sprintf("%s,%s", tags, tag)
	}
	err = syscall.Setxattr(filename, "user.xdg.tags", []byte(tags), 0)
	if err != nil {
		err = fmt.Errorf("WriteAttributes: %s", err.Error())
		return
	}
	err = syscall.Setxattr(filename, "user.xdg.comment", []byte(post.Comment()), 0)
	if err != nil {
		err = fmt.Errorf("WriteAttributes: %s", err.Error())
		return
	}
	return
}