// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
// All rights reserved.

// time.go
package utils

import (
	"fmt"
	"strconv"
	"strings"
	"time"
)

func StringTimestamp2GoTime(s string) (ts time.Time) {
	secs, err := strconv.ParseInt(s, 10, 64)
	if err == nil {
		ts = time.Unix(secs, 0)
	}
	return
}

func StringSeconds2GoDuration(s string) (secs time.Duration) {
	if len(s) > 0 {
		if s[len(s)-1] != 's' {
			s += "s"
		}
		secs, _ = time.ParseDuration(s)
	}
	return
}

// Convert the spec string to a number of seconds.
// spec is a number, optionally followed by a time unit among 's'(seconds),
// 'm'(minutes), 'h'(hours), and 'd'(days)
// If the time unit is omitted, defaultUnit is used.
// Empty spec returns 0 seconds.
func ParseTimeInterval(spec string, defaultUnit byte) (interval int64, err error) {
	var u byte
	var intVal int

	spec = strings.TrimSpace(spec)
	if len(spec) == 0 {
		//err = errors.New(iface.ErrEmptyValue)
		return
	}
	spec = strings.ToLower(spec)
	u = spec[len(spec)-1]
	if u >= '0' && u <= '9' {
		u = 'm'
	} else {
		spec = spec[0 : len(spec)-1]
	}
	if intVal, err = strconv.Atoi(spec); err != nil {
		return
		// } else if intVal <= 0 {
		// 	err = errors.New(iface.ErrMustBePositive)
		// 	return
	}

	switch u {
	case 's':
		interval = int64(intVal)
	case 'm':
		interval = int64(intVal) * 60
	case 'h':
		interval = int64(intVal) * 3600
	case 'd':
		interval = int64(intVal) * 86400
	default:
		err = fmt.Errorf("invalid time unit %c", u)
	}
	return
}