package db

import (
	"database/sql"
	"time"
)

// Timestamps are stored as RFC3339Nano TEXT explicitly (rather than relying
// on driver-specific time.Time marshaling) so the on-disk format is stable
// and easy to inspect with the sqlite3 CLI.

const timeLayout = time.RFC3339Nano

func timeToDB(t time.Time) string {
	return t.UTC().Format(timeLayout)
}

func timePtrToDB(t *time.Time) interface{} {
	if t == nil {
		return nil
	}
	return timeToDB(*t)
}

func dbToTime(s string) (time.Time, error) {
	return time.Parse(timeLayout, s)
}

func nullStringToTimePtr(ns sql.NullString) (*time.Time, error) {
	if !ns.Valid || ns.String == "" {
		return nil, nil
	}
	t, err := dbToTime(ns.String)
	if err != nil {
		return nil, err
	}
	return &t, nil
}