// Copyright (C) 2021 Marius Schellenberger

package server

import (
	"runtime"
	"strconv"

	"git.giftfish.de/ston1th/docstore/pkg/core"
	bleve "git.giftfish.de/ston1th/docstore/pkg/index"
)

const div = 1048576

func fmtMem(i uint64) string {
	return strconv.FormatFloat(float64(i)/div, 'f', 2, 64)
}

func getStats(i *bleve.Index) *core.Stats {
	mem := new(runtime.MemStats)
	runtime.ReadMemStats(mem)
	return &core.Stats{
		Goroutines: runtime.NumGoroutine(),
		Alloc:      fmtMem(mem.Alloc),
		Sys:        fmtMem(mem.Sys),
		Docs:       i.DocCount(),
		GoVersion:  runtime.Version(),
	}
}

func scanFile(srv *HTTPServer, path string) (err error) {
	err = srv.FS.AddScan(path)
	if err != nil {
		return
	}
	go func() {
		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")
		}
	}()
	return
}

// Parts taken from strings.TrimPrefix
func hasTrimPrefix(s, prefix string) (string, bool) {
	if len(s) >= len(prefix) && s[0:len(prefix)] == prefix {
		return s[len(prefix):], true
	}
	return s, false
}