package slice

import "html/template"
import "github.com/gabriel-vasile/mimetype"
import "git.tebibyte.media/sashakoshka/step"

const hiddenPrefix = "."

var _ step.FuncProvider = new(Provider)

// Provider provides MIME functions.
type Provider struct {
	
}

// FuncMap fulfills the step.FuncProvider interface.
func (this *Provider) FuncMap () template.FuncMap {
	return nil
}

// FuncMapFor fulfills the step.FuncProviderFor interface.
func (this *Provider) FuncMapFor (document *step.Document) template.FuncMap {
	stat := &state {
		document: document,
	}
	return template.FuncMap {
		"fileContentType": stat.funcFileContentType,
	}
}

type state struct {
	document *step.Document
}

func (this *state) funcFileContentType (name string) (string, error) {
	name, err := this.document.Rel(name)
	if err != nil { return "", err }
	typ, err := mimetype.DetectFile(name)
	if err != nil { return "", err }
	return typ.String(), err
}