feat: build the occurrence index

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

src/stores/chronoOperationsStore.ts

@@ -10,6 +10,7 @@ import { useEntitiesStore } from '@ChronoManager/stores/entitiesStore'
 import { useServicesStore } from '@ChronoManager/stores/servicesStore'
 import { useImportStore } from '@ChronoManager/stores/importStore'
 import type { VisibleDateRange } from '@/types'
+import { buildOccurrenceIndex, occurrencesForRange } from '@/utils/occurrenceIndex'
 
 type ChronoEntityProperties = EventObject | TaskObject
 
@@ -44,6 +45,10 @@ export const useChronoOperationsStore = defineStore('chronoOperationsStore', ()
     return events.value.filter(event => visibleCalendarIds.includes(event.collection))
   })
   const filteredTasks = computed(() => tasks.value)
+  const occurrenceIndex = computed(() => buildOccurrenceIndex(filteredEvents.value))
+  const visibleOccurrences = computed(() => visibleRange.value
+    ? occurrencesForRange(occurrenceIndex.value, visibleRange.value)
+    : [])
 
   function setVisibleRange(range: VisibleDateRange) {
     if (
@@ -176,6 +181,8 @@ export const useChronoOperationsStore = defineStore('chronoOperationsStore', ()
     tasks,
     filteredEvents,
     filteredTasks,
+    occurrenceIndex,
+    visibleOccurrences,
     setVisibleRange,
     saveEntity,
     deleteEntity,