DefaultConfig returns a Config with default values.

find calendar list based on location, logic from thunderbird.

FindCalendarsWithConfig allows injecting custom configuration for testing.

NewDAVClient creates a new CalDAV client with the given http.Client and calendar URL.

NewDAVClientWithBasicAuth creates a new CalDAV client with basic auth credentials.

CalendarObject represents a calendar object with its metadata.

Config holds configuration for FindCalendars.

TimeRange represents a time range filter.

DAVClient interface defines the CalDAV client operations.

DNSResolver interface for mocking DNS lookups in tests.

ObjectFilter is the interface for filtering calendar objects.

PropfindFunc is a function type for mocking PROPFIND.