LeadKit/TIAppleMapUtils/Sources/AppleClusterPlacemarkManager.swift

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//  Copyright (c) 2022 Touch Instinct
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import TIMapUtils
import MapKit
import UIKit

open class AppleClusterPlacemarkManager<Model>: BasePlacemarkManager<MKAnnotationView, [ApplePlacemarkManager<Model>], MKMapRect>, MKMapViewDelegate {
    public weak var mapViewDelegate: MKMapViewDelegate?

    private let mapDelegateSelectors = NSObject.instanceMethodSelectors(of: MKMapViewDelegate.self)

    public init<IF: MarkerIconFactory>(placemarkManagers: [ApplePlacemarkManager<Model>],
                                       mapViewDelegate: MKMapViewDelegate? = nil,
                                       iconFactory: IF?,
                                       tapHandler: TapHandlerClosure?) where IF.Model == [Model] {

        self.mapViewDelegate = mapViewDelegate

        super.init(dataModel: placemarkManagers,
                   iconFactory: iconFactory?.asAnyMarkerIconFactory { $0.map { $0.dataModel } },
                   tapHandler: tapHandler)
    }

    open func addMarkers(to map: MKMapView) {
        map.delegate = self
        map.addAnnotations(dataModel)
    }

    open func removeMarkers(from map: MKMapView) {
        map.removeAnnotations(dataModel)
    }

    // MARK: - PlacemarkManager

    override open func configure(placemark: MKAnnotationView) {
        guard let clusterAnnotation = placemark.annotation as? MKClusterAnnotation,
              let placemarkManagers = clusterAnnotation.memberAnnotations as? [ApplePlacemarkManager<Model>] else {
                  return
              }

        placemark.image = iconFactory?.markerIcon(for: placemarkManagers)
    }

    // MARK: - MKMapViewDelegate

    open func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        guard !(mapViewDelegate?.responds(to: #selector(mapView(_:viewFor:))) ?? false) else {
            return mapViewDelegate?.mapView?(mapView, viewFor: annotation)
        }

        switch annotation {
        case is MKClusterAnnotation:
            let defaultAnnotationView = iconFactory != nil
                ? MKAnnotationView(annotation: annotation,
                                   reuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
                : MKMarkerAnnotationView(annotation: annotation,
                                         reuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)

            configure(placemark: defaultAnnotationView)

            return defaultAnnotationView
        case let placemarkManager as ApplePlacemarkManager<Model>:
            let defaultAnnotationView = placemarkManager.iconFactory != nil
                ? MKAnnotationView(annotation: annotation,
                                   reuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
                : MKMarkerAnnotationView(annotation: annotation,
                                         reuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)

            placemarkManager.configure(placemark: defaultAnnotationView)

            return defaultAnnotationView
        default:
            return nil
        }
    }

    open func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {
        guard !(mapViewDelegate?.responds(to: #selector(mapView(_:didSelect:))) ?? false) else {
            mapViewDelegate?.mapView?(mapView, didSelect: view)
            return
        }

        switch view.annotation {
        case let clusterAnnotation as MKClusterAnnotation:
            guard let placemarkManagers = clusterAnnotation.memberAnnotations as? [ApplePlacemarkManager<Model>] else {
                return
            }

            _ = tapHandler?(placemarkManagers, .from(coordinates: placemarkManagers.map { $0.coordinate }))
        case let placemarkManager as ApplePlacemarkManager<Model>:
            _ = placemarkManager.tapHandler?(placemarkManager.dataModel, placemarkManager.coordinate)
        default:
            return
        }
    }

    // MARK: - MKMapViewDelegate selectors forwarding

    open override func responds(to aSelector: Selector) -> Bool {
        let superResponds = super.responds(to: aSelector)

        guard !superResponds else {
            return superResponds
        }

        guard mapDelegateSelectors.contains(aSelector) else {
            return superResponds
        }

        return mapViewDelegate?.responds(to: aSelector) ?? false
    }

    open override func forwardingTarget(for aSelector: Selector) -> Any? {
        guard mapDelegateSelectors.contains(aSelector) else {
            return nil
        }

        return mapViewDelegate
    }
}