package filemanager

import (
	"net/http"
	"os"
	"strings"
)

// responseWriterNoBody is a wrapper used to suprress the body of the response
// to a request. Mainly used for HEAD requests.
type responseWriterNoBody struct {
	http.ResponseWriter
}

// newResponseWriterNoBody creates a new responseWriterNoBody.
func newResponseWriterNoBody(w http.ResponseWriter) *responseWriterNoBody {
	return &responseWriterNoBody{w}
}

// Header executes the Header method from the http.ResponseWriter.
func (w responseWriterNoBody) Header() http.Header {
	return w.ResponseWriter.Header()
}

// Write suprresses the body.
func (w responseWriterNoBody) Write(data []byte) (int, error) {
	return 0, nil
}

// WriteHeader writes the header to the http.ResponseWriter.
func (w responseWriterNoBody) WriteHeader(statusCode int) {
	w.ResponseWriter.WriteHeader(statusCode)
}

// matchURL checks if the first URL matches the second.
func matchURL(first, second string) bool {
	first = strings.ToLower(first)
	second = strings.ToLower(second)

	return strings.HasPrefix(first, second)
}

// errorToHTTP converts errors to HTTP Status Code.
func errorToHTTP(err error, gone bool) int {
	switch {
	case os.IsPermission(err):
		return http.StatusForbidden
	case os.IsNotExist(err):
		if !gone {
			return http.StatusNotFound
		}

		return http.StatusGone
	case os.IsExist(err):
		return http.StatusGone
	default:
		return http.StatusInternalServerError
	}
}