// Package timex provides time formatting and computation helpers on top of gtime.
package timex

import (
	"github.com/gogf/gf/v2/os/gtime"
)

const (
	// LayoutDateTime is the conventional datetime layout: 2006-01-02 15:04:05.
	LayoutDateTime = "2006-01-02 15:04:05"
	// LayoutDate is the conventional date layout: 2006-01-02.
	LayoutDate = "2006-01-02"
)

// Now returns the current time.
func Now() *gtime.Time {
	return gtime.Now()
}

// Format returns t formatted with the given Go layout.
// When layout is empty, LayoutDateTime is used.
//
// Note: gtime v2.10.2's Format() takes PHP-style format ("Y-m-d H:i:s"),
// so this helper uses the Layout() method which accepts Go layouts.
func Format(t *gtime.Time, layout ...string) string {
	ly := LayoutDateTime
	if len(layout) > 0 && layout[0] != "" {
		ly = layout[0]
	}
	return t.Layout(ly)
}

// Timestamp returns the current Unix timestamp in seconds.
func Timestamp() int64 {
	return gtime.Now().Timestamp()
}

// StartOfDay returns the beginning (00:00:00) of the day containing t.
func StartOfDay(t *gtime.Time) *gtime.Time {
	return gtime.NewFromStr(t.Layout(LayoutDate) + " 00:00:00")
}

// EndOfDay returns the end (23:59:59) of the day containing t.
func EndOfDay(t *gtime.Time) *gtime.Time {
	return gtime.NewFromStr(t.Layout(LayoutDate) + " 23:59:59")
}