48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
package calendarops
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import (
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"errors"
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basetypes "code.apps.glenux.net/glenux/kiwimix/pkg/basetypes"
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)
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// DifferenceCalendarOperation is an operation that substract a calendar from
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// another
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type DifferenceCalendarOperation struct{}
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// Ensure DifferenceCalendarOperation implements CalendarOperation
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var _ CalendarOperation = (*DifferenceCalendarOperation)(nil)
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func (op DifferenceCalendarOperation) Execute(calendars ...basetypes.Calendar) (basetypes.Calendar, error) {
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// Check that two calendars are provided
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if len(calendars) != 2 {
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return basetypes.Calendar{}, errors.New("difference operation requires exactly two calendars")
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}
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// Create a new calendar to store the difference
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differenceCalendar := basetypes.NewCalendar()
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// Iterate over the events in the first calendar
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for _, event1 := range calendars[0].GetEvents() {
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// Assume initially that the event is unique to the first calendar
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isUnique := true
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// Compare with the events in the second calendar
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for _, event2 := range calendars[1].GetEvents() {
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if event1.Equals(event2) {
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// If the event is also in the second calendar, it is not unique
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isUnique = false
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break
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}
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}
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// If the event is unique to the first calendar, add it to the difference calendar
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if isUnique {
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differenceCalendar.SetEvent(event1)
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}
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}
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// Return the difference calendar
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return differenceCalendar, nil
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}
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