75 lines
1.2 KiB
Go
75 lines
1.2 KiB
Go
package item
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import (
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"slices"
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"time"
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)
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type RecurPeriod string
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const (
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PeriodDay RecurPeriod = "day"
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PeriodMonth RecurPeriod = "month"
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)
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var ValidPeriods = []RecurPeriod{PeriodDay, PeriodMonth}
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type Recur struct {
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Start time.Time `json:"start"`
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Period RecurPeriod `json:"period"`
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Count int `json:"count"`
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}
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func (r *Recur) On(date time.Time) bool {
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switch r.Period {
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case PeriodDay:
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return r.onDays(date)
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case PeriodMonth:
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return r.onMonths(date)
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default:
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return false
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}
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}
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func (r *Recur) onDays(date time.Time) bool {
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if r.Start.After(date) {
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return false
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}
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testDate := r.Start
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for {
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if testDate.Equal(date) {
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return true
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}
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if testDate.After(date) {
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return false
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}
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dur := time.Duration(r.Count) * 24 * time.Hour
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testDate = testDate.Add(dur)
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}
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}
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func (r *Recur) onMonths(date time.Time) bool {
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if r.Start.After(date) {
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return false
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}
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tDate := r.Start
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for {
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if tDate.Equal(date) {
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return true
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}
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if tDate.After(date) {
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return false
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}
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y, m, d := tDate.Date()
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tDate = time.Date(y, m+time.Month(r.Count), d, 0, 0, 0, 0, time.UTC)
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}
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}
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func (r *Recur) Valid() bool {
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return r.Start.IsZero() || !slices.Contains(ValidPeriods, r.Period)
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}
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