package shareEntry

import (
	"encoding/json"
	"errors"
	"path/filepath"
	"sync"

	"imuslab.com/arozos/mod/database"
)

/*
	Share Entry

	This module is designed to isolate the entry operatiosn with the
	handle operations so as to reduce the complexity of recursive import
	during development
*/

type ShareEntryTable struct {
	FileToUrlMap *sync.Map
	UrlToFileMap *sync.Map
	Database     *database.Database
}

type ShareOption struct {
	UUID             string
	FileRealPath     string
	Owner            string
	Accessibles      []string //Use to store username or group names if permission is groups or users
	Permission       string   //Access permission, allow {anyone / signedin / samegroup / groups / users}
	AllowLivePreview bool
}

func NewShareEntryTable(db *database.Database) *ShareEntryTable {
	//Create the share table if not exists
	db.NewTable("share")

	FileToUrlMap := sync.Map{}
	UrlToFileMap := sync.Map{}

	//Load the old share links
	entries, _ := db.ListTable("share")
	for _, keypairs := range entries {
		shareObject := new(ShareOption)
		json.Unmarshal(keypairs[1], &shareObject)
		if shareObject != nil {
			//Append this to the maps
			FileToUrlMap.Store(shareObject.FileRealPath, shareObject)
			UrlToFileMap.Store(shareObject.UUID, shareObject)
		}

	}

	return &ShareEntryTable{
		FileToUrlMap: &FileToUrlMap,
		UrlToFileMap: &UrlToFileMap,
		Database:     db,
	}
}

//Delete the share on this vpath
func (s *ShareEntryTable) DeleteShare(rpath string) error {
	//Check if the share already exists. If yes, use the previous link
	val, ok := s.FileToUrlMap.Load(rpath)
	if ok {
		//Exists. Send back the old share url
		uuid := val.(*ShareOption).UUID

		//Remove this from the database
		err := s.Database.Delete("share", uuid)
		if err != nil {
			return err
		}

		//Remove this form the current sync map
		s.UrlToFileMap.Delete(uuid)
		s.FileToUrlMap.Delete(rpath)

		return nil

	} else {
		//Already deleted from buffered record.
		return nil
	}

}

func (s *ShareEntryTable) GetShareUUIDFromPath(rpath string) string {
	targetShareObject := s.GetShareObjectFromRealPath(rpath)
	if (targetShareObject) != nil {
		return targetShareObject.UUID
	}
	return ""
}

func (s *ShareEntryTable) GetShareObjectFromRealPath(rpath string) *ShareOption {
	rpath = filepath.ToSlash(filepath.Clean(rpath))
	var targetShareOption *ShareOption
	s.FileToUrlMap.Range(func(k, v interface{}) bool {
		filePath := k.(string)
		shareObject := v.(*ShareOption)

		if filepath.ToSlash(filepath.Clean(filePath)) == rpath {
			targetShareOption = shareObject
		}

		return true
	})

	return targetShareOption
}

func (s *ShareEntryTable) GetShareObjectFromUUID(uuid string) *ShareOption {
	var targetShareOption *ShareOption
	s.UrlToFileMap.Range(func(k, v interface{}) bool {
		thisUuid := k.(string)
		shareObject := v.(*ShareOption)

		if thisUuid == uuid {
			targetShareOption = shareObject
		}

		return true
	})

	return targetShareOption
}

func (s *ShareEntryTable) FileIsShared(rpath string) bool {
	shareUUID := s.GetShareUUIDFromPath(rpath)
	return shareUUID != ""
}

func (s *ShareEntryTable) RemoveShareByRealpath(rpath string) error {
	so, ok := s.FileToUrlMap.Load(rpath)
	if ok {
		shareUUID := so.(*ShareOption).UUID
		s.UrlToFileMap.Delete(shareUUID)
		s.FileToUrlMap.Delete(rpath)
		s.Database.Delete("share", shareUUID)
	} else {
		return errors.New("Share with given realpath not exists")
	}
	return nil
}

func (s *ShareEntryTable) RemoveShareByUUID(uuid string) error {
	so, ok := s.UrlToFileMap.Load(uuid)
	if ok {
		s.FileToUrlMap.Delete(so.(*ShareOption).FileRealPath)
		s.UrlToFileMap.Delete(uuid)
		s.Database.Delete("share", uuid)
	} else {
		return errors.New("Share with given uuid not exists")
	}
	return nil
}