package static

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

type ServeFileSystem interface {
	http.FileSystem
	Exists(prefix string, path string) bool
}

func ServeRoot(urlPrefix, root string) gin.HandlerFunc {
	return Serve(urlPrefix, LocalFile(root, false))
}

// Serve returns a middleware handler that serves static files in the given directory.
func Serve(urlPrefix string, fs ServeFileSystem) gin.HandlerFunc {
	fileserver := http.FileServer(fs)
	if urlPrefix != "" {
		fileserver = http.StripPrefix(urlPrefix, fileserver)
	}
	return func(c *gin.Context) {
		if fs.Exists(urlPrefix, c.Request.URL.Path) {
			fileserver.ServeHTTP(c.Writer, c.Request)
			c.Abort()
		}
	}
}