/*
Copyright © 2023 Thomas von Dein

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

package api

import (
	"fmt"
	"regexp"
	"strconv"
	"time"
)

const ApiVersion string = "/v1"

// used to return to the api client
type Result struct {
	Success bool
	Message string
	Code    int
}

// Binding from JSON, data coming from user, not tainted
type Meta struct {
	Expire string `json:"expire" form:"expire"`
}

// vaious helbers
func Log(format string, values ...any) {
	fmt.Printf("[DEBUG] "+format+"\n", values...)
}

func Ts() string {
	t := time.Now()
	return t.Format("2006-01-02-15-04-")
}

func NormalizeFilename(file string) string {
	r := regexp.MustCompile(`[^\w\d\-_\\.]`)

	return Ts() + r.ReplaceAllString(file, "")
}

/*
   We could use time.ParseDuration(), but this doesn't support days.

   We  could also  use github.com/xhit/go-str2duration/v2,  which does
   the job,  but it's  just another dependency,  just for  this little
   gem. And  we don't need a  time.Time value.

   Convert a  duration into  seconds (int).
   Valid  time units  are "s", "m", "h" and "d".
*/
func duration2int(duration string) int {
	re := regexp.MustCompile(`(\d+)([dhms])`)
	seconds := 0

	for _, match := range re.FindAllStringSubmatch(duration, -1) {
		if len(match) == 3 {
			v, _ := strconv.Atoi(match[1])
			switch match[2][0] {
			case 'd':
				seconds += v * 86400
			case 'h':
				seconds += v * 3600
			case 'm':
				seconds += v * 60
			case 's':
				seconds += v
			}
		}
	}

	return seconds
}

/*
   Calculate   if  time   is   up  based   on   start  time.Time   and
   duration. Returns  true if time  is expired. Start time  comes from
   the database.

aka:
   if(now - start) >= duration { time is up}
*/
func IsExpired(start time.Time, duration string) bool {
	now := time.Now()
	expiretime := duration2int(duration)

	if now.Unix()-start.Unix() >= int64(expiretime) {
		return true
	}

	return false
}