package bokofs

import (
	"log"
	"net/http"
	"os"
	"sync"

	"golang.org/x/net/webdav"
	"imuslab.com/bokofs/bokofsd/mod/bokofs/bokoworker"
)

/*
	WebDAV module

	This module handle the interfacing to the underlying file system
	through the middle ware
*/

type Server struct {
	LoadedWorkers sync.Map //Storing uuid to bokoworker pointer (*bokoworker.Worker)
	RootRouter    FlowRouter
	prefix        string
}

/* NewWebdavInterfaceServer creates a new WebDAV server instance */
func NewWebdavInterfaceServer(pathPrfix string) (*Server, error) {
	thisServer := Server{
		LoadedWorkers: sync.Map{},
		prefix:        pathPrfix,
	}

	//Initiate the root router file system
	err := thisServer.InitiateRootRouter()
	if err != nil {
		return nil, err
	}

	return &thisServer, nil
}

func (s *Server) AddWorker(worker *bokoworker.Worker) error {
	//Check if the worker root path is already loaded
	if _, ok := s.LoadedWorkers.Load(worker.RootPath); ok {
		return os.ErrExist
	}
	s.LoadedWorkers.Store(worker.RootPath, worker)
	return nil
}

func (s *Server) RemoveWorker(workerRootPath string) {
	s.LoadedWorkers.Delete(workerRootPath)
}

func (s *Server) Handler() http.Handler {
	srv := &webdav.Handler{
		FileSystem: s.RootRouter,
		LockSystem: webdav.NewMemLS(),
		Logger: func(r *http.Request, err error) {
			if err != nil {
				log.Printf("WEBDAV [%s]: %s, ERROR: %s\n", r.Method, r.URL, err)
			} else {
				log.Printf("WEBDAV [%s]: %s \n", r.Method, r.URL)
			}
		},
	}
	return srv
}