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resources/js/Composables/useRegionFlights.ts

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+// composables/useRegionFlights.ts
+import {computed, Ref} from "vue";
+import {Flight, Region} from "@/Types/types";
+
+export function useRegionFlights(
+    flights: Ref<Flight[]>,
+    regionCodes: string[],
+    countryCode: string,
+    regions: Ref<Region[]>,
+) {
+    const filteredFlights = computed(() => {
+        return flights.value.filter(flight => {
+            const depCode = flight.departure_airport?.region?.local_code
+            const depCountry = flight.departure_airport?.region?.country?.code
+            const arrCode = flight.arrival_airport?.region?.local_code
+            const arrCountry = flight.arrival_airport?.region?.country?.code
+
+            return (depCountry === countryCode && depCode && regionCodes.includes(depCode)) ||
+                (arrCountry === countryCode && arrCode && regionCodes.includes(arrCode))
+        })
+    })
+
+    const flightsByRegion = computed(() => {
+        return filteredFlights.value.reduce((grouped, flight) => {
+            const dep = flight.departure_airport?.region
+            const arr = flight.arrival_airport?.region
+
+            const regions = [
+                    dep?.country?.code === countryCode ? dep?.local_code : null,
+                    arr?.country?.code === countryCode ? arr?.local_code : null,
+                ].filter((code): code is string => !!code && regionCodes.includes(code))
+
+            ;[...new Set(regions)].forEach(code => {
+                if (!grouped[code]) grouped[code] = []
+                grouped[code].push(flight)
+            })
+
+            return grouped
+        }, {} as Record<string, Flight[]>)
+    })
+
+    const regionNames = computed(() => {
+        return Object.fromEntries(
+            regions.value
+                .filter(r => regionCodes.includes(r.local_code))
+                .map(r => [r.local_code, r.name])
+        )
+    })
+
+    const visitedRegions = computed(() => new Set(Object.keys(flightsByRegion.value)))
+
+    return { filteredFlights, flightsByRegion, visitedRegions, regionNames }
+}