// 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(),
	}
}

// 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
}