/**
 * OverlapDetector - Ren tidbaseret overlap detection
 * Ingen DOM manipulation, kun tidsberegninger
 */
export class OverlapDetector {
    /**
     * Resolver hvilke events et givent event overlapper med i en kolonne
     * @param event - CalendarEvent der skal checkes for overlap
     * @param columnEvents - Array af CalendarEvent objekter i kolonnen
     * @returns Array af events som det givne event overlapper med
     */
    resolveOverlap(event, columnEvents) {
        return columnEvents.filter(existingEvent => {
            // To events overlapper hvis:
            // event starter før existing slutter OG
            // event slutter efter existing starter
            return event.start < existingEvent.end && event.end > existingEvent.start;
        });
    }
    /**
     * Dekorerer events med stack linking data
     * @param newEvent - Det nye event der skal tilføjes
     * @param overlappingEvents - Events som det nye event overlapper med
     * @returns OverlapResult med overlappende events og stack links
     */
    decorateWithStackLinks(newEvent, overlappingEvents) {
        const stackLinks = new Map();
        if (overlappingEvents.length === 0) {
            return {
                overlappingEvents: [],
                stackLinks
            };
        }
        // Kombiner nyt event med eksisterende og sortér efter start tid (tidligste første)
        const allEvents = [...overlappingEvents, newEvent].sort((a, b) => a.start.getTime() - b.start.getTime());
        // Opret sammenhængende kæde - alle events bindes sammen
        allEvents.forEach((event, index) => {
            const stackLink = {
                stackLevel: index,
                prev: index > 0 ? allEvents[index - 1].id : undefined,
                next: index < allEvents.length - 1 ? allEvents[index + 1].id : undefined
            };
            stackLinks.set(event.id, stackLink);
        });
        overlappingEvents.push(newEvent);
        return {
            overlappingEvents,
            stackLinks
        };
    }
}
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