// Copyright (C) 2021 Marius Schellenberger

package server

import (
	"errors"
	"git.giftfish.de/ston1th/gowiki/pkg/core"
	bleve "git.giftfish.de/ston1th/gowiki/pkg/index"
	"runtime"
	"strconv"
	"time"
)

const (
	day = time.Hour * 24
	min = time.Second * 30
	max = day * 90

	div = 1048576
)

func duration(duration, mode string) (d time.Duration, err error) {
	switch mode {
	case "1":
		d, err = time.ParseDuration(duration)
		if err != nil {
			err = errors.New("could not parse duration")
			return
		}
	case "2":
		var t int
		t, err = strconv.Atoi(duration)
		if err != nil {
			err = errors.New("could not parse duration")
			return
		}
		d = time.Duration(int(day) * t)
	default:
		err = errors.New("invalid mode")
		return
	}

	if d < min {
		err = errors.New("minimum duration is 30 seconds")
	}
	if d > max {
		err = errors.New("maximum duration is 90 days")
	}
	return
}

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(),
	}
}