// Copyright (C) 2022 Marius Schellenberger

package server

import "context"

type ScanQueue struct {
	ctx   context.Context
	srv   *HTTPServer
	pchan chan string
}

func NewScanQueue(ctx context.Context, srv *HTTPServer, buffer int) *ScanQueue {
	return &ScanQueue{
		ctx:   ctx,
		srv:   srv,
		pchan: make(chan string, buffer),
	}
}

func (sq *ScanQueue) Add(path string) (err error) {
	err = sq.srv.FS.AddScan(path)
	if err != nil {
		return
	}
	go func() {
		select {
		case <-sq.ctx.Done():
			return
		case sq.pchan <- path:
		}
	}()
	return
}

func (sq *ScanQueue) Scan() {
	for {
		select {
		case <-sq.ctx.Done():
			//close(sq.pchan)
			return
		case p := <-sq.pchan:
			sq.scanFile(p)
		}
	}
}

func (sq *ScanQueue) scanFile(path string) {
	srv := sq.srv
	defer srv.FS.RemoveScan(path)
	log := srv.Log.WithValues("file", path)
	file, txt, err := srv.Scanner.Scan(path)
	if err != nil {
		log.Error(err, "error scanning file")
		return
	}
	tags, err := srv.DB.GetAllRTags()
	if err != nil {
		log.Error(err, "error getting tags")
	}
	found := tags.Match(txt)
	id, err := srv.DB.Index.Add(txt, found)
	if err != nil {
		log.Error(err, "error adding file to index")
		return
	}
	err = srv.DB.NewFile(id, file, found)
	if err != nil {
		log.Error(err, "error adding file to DB")
	}
}