//
//  MapViewSwitUI.swift
//  Meshtastic
//
//  Copyright(c) Garth Vander Houwen 1/9/23.
//

import SwiftUI
import MapKit

struct MapViewSwiftUI: UIViewRepresentable {
	
	var onMarkerTap: (_ waypointCoordinate: CLLocationCoordinate2D? ) -> Void
	let mapView = MKMapView()
	let positions: [PositionEntity]
	let region: MKCoordinateRegion
	let mapViewType: MKMapType
	
	
	// Offline Maps
	//make this view dependent on the UserDefault that is updated when importing a new map file
	@AppStorage("lastUpdatedLocalMapFile") private var lastUpdatedLocalMapFile = 0
	@State private var loadedLastUpdatedLocalMapFile = 0
	var customMapOverlay: CustomMapOverlay?
	@State private var presentCustomMapOverlayHash: CustomMapOverlay?
	var overlays: [Overlay] = []
	
	func makeUIView(context: Context) -> MKMapView {
		mapView.mapType = mapViewType
		mapView.setRegion(region, animated: true)
		mapView.isRotateEnabled = true
		mapView.isPitchEnabled = true
		mapView.showsBuildings = true;
		mapView.addAnnotations(positions)
		mapView.showsUserLocation = true
		mapView.setUserTrackingMode(.none, animated: false)
		mapView.showsCompass = true
		mapView.showsScale = true
		mapView.isZoomEnabled = true
		mapView.isScrollEnabled = true
		mapView.delegate = context.coordinator
		return mapView
	}
	
	func updateUIView(_ mapView: MKMapView, context: Context) {
		mapView.mapType = mapViewType
	}
	
	func makeCoordinator() -> MapCoordinator {
		return Coordinator(self)
	}
	
	final class MapCoordinator: NSObject, MKMapViewDelegate, UIGestureRecognizerDelegate {
		
		var parent: MapViewSwiftUI
		var longPressRecognizer = UILongPressGestureRecognizer()
		
		init(_ parent: MapViewSwiftUI) {
			self.parent = parent
			super.init()
			self.longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(longPressHandler))
			self.longPressRecognizer.minimumPressDuration = 0.2
			self.longPressRecognizer.delegate = self
			self.parent.mapView.addGestureRecognizer(longPressRecognizer)
		}
		
		func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
			
			switch annotation {
				
			case _ as MKClusterAnnotation:
				let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "nodeGroup") as? MKMarkerAnnotationView ?? MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: "nodeGroup")
				annotationView.markerTintColor = .systemRed
				return annotationView
			case _ as PositionEntity:
				let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "node") as? MKMarkerAnnotationView ?? MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: "Node")
				annotationView.canShowCallout = true
				annotationView.glyphText = "📟"
				annotationView.clusteringIdentifier = "nodeGroup"
				annotationView.markerTintColor = UIColor(.accentColor)
				annotationView.titleVisibility = .visible
				return annotationView
			default: return nil
			}
		}
		
		@objc func longPressHandler(_ gesture: UILongPressGestureRecognizer) {
			//if gesture.state == .ended {
				// Screen Position - CGPoint
				let location = longPressRecognizer.location(in: self.parent.mapView)
				// Map Coordinate - CLLocationCoordinate2D
				let coordinate = self.parent.mapView.convert(location, toCoordinateFrom: self.parent.mapView)
				print(coordinate)
				
				// Add annotation:
				let annotation = MKPointAnnotation()
				annotation.title = "Dropped Pin"
				annotation.coordinate = coordinate
				parent.mapView.addAnnotation(annotation)
				parent.onMarkerTap(coordinate)
				UINotificationFeedbackGenerator().notificationOccurred(.success)
			//}
		}
	}
	
	/// is supposed to be located in the folder with the map name
	public struct DefaultTile: Hashable {
		let tileName: String
		let tileType: String

		public init(tileName: String, tileType: String) {
			self.tileName = tileName
			self.tileType = tileType
		}
	}

	public struct CustomMapOverlay: Equatable, Hashable {
		let mapName: String
		let tileType: String
		var canReplaceMapContent: Bool
		var minimumZoomLevel: Int?
		var maximumZoomLevel: Int?
		let defaultTile: DefaultTile?

		public init(
			mapName: String,
			tileType: String,
			canReplaceMapContent: Bool = true, // false for transparent tiles
			minimumZoomLevel: Int? = nil,
			maximumZoomLevel: Int? = nil,
			defaultTile: DefaultTile? = nil
		) {
			
			self.mapName = mapName
			self.tileType = tileType
			self.canReplaceMapContent = canReplaceMapContent
			self.minimumZoomLevel = minimumZoomLevel
			self.maximumZoomLevel = maximumZoomLevel
			self.defaultTile = defaultTile
		}
		
		public init?(
			mapName: String?,
			tileType: String,
			canReplaceMapContent: Bool = true, // false for transparent tiles
			minimumZoomLevel: Int? = nil,
			maximumZoomLevel: Int? = nil,
			defaultTile: DefaultTile? = nil
		) {
			if (mapName == nil || mapName! == "") {
				return nil
			}
			self.mapName = mapName!
			self.tileType = tileType
			self.canReplaceMapContent = canReplaceMapContent
			self.minimumZoomLevel = minimumZoomLevel
			self.maximumZoomLevel = maximumZoomLevel
			self.defaultTile = defaultTile
		}
	}

	public class CustomMapOverlaySource: MKTileOverlay {

		// requires folder: tiles/{mapName}/z/y/y,{tileType}
		private var parent: MapView
		private let mapName: String
		private let tileType: String
		private let defaultTile: DefaultTile?

		public init(
			parent: MapView,
			mapName: String,
			tileType: String,
			defaultTile: DefaultTile?
		) {
			self.parent = parent
			self.mapName = mapName
			self.tileType = tileType
			self.defaultTile = defaultTile
			super.init(urlTemplate: "")
		}

		public override func url(forTilePath path: MKTileOverlayPath) -> URL {
			if let tileUrl = Bundle.main.url(
				forResource: "\(path.y)",
				withExtension: self.tileType,
				subdirectory: "tiles/\(self.mapName)/\(path.z)/\(path.x)",
				localization: nil
			) {
				return tileUrl
			} else if let defaultTile = self.defaultTile, let defaultTileUrl = Bundle.main.url(
				forResource: defaultTile.tileName,
				withExtension: defaultTile.tileType,
				subdirectory: "tiles/\(self.mapName)",
				localization: nil
			) {
				return defaultTileUrl
			} else {
				let urlstring = self.mapName+"\(path.z)/\(path.x)/\(path.y).png"
				return URL(string: urlstring)!
				// Bundle.main.url(forResource: "surrounding", withExtension: "png", subdirectory: "tiles")!
			}
		
		}
		
	}
	
	public struct Overlay {
		
		public static func == (lhs: MapViewSwiftUI.Overlay, rhs: MapViewSwiftUI.Overlay) -> Bool {
			// maybe to use in the future for comparison of full array
			lhs.shape.coordinate.latitude == rhs.shape.coordinate.latitude &&
			lhs.shape.coordinate.longitude == rhs.shape.coordinate.longitude &&
			lhs.fillColor == rhs.fillColor
		}

		var shape: MKOverlay
		var fillColor: UIColor?
		var strokeColor: UIColor?
		var lineWidth: CGFloat

		public init(
			shape: MKOverlay,
			fillColor: UIColor? = nil,
			strokeColor: UIColor? = nil,
			lineWidth: CGFloat = 0
		) {
			self.shape = shape
			self.fillColor = fillColor
			self.strokeColor = strokeColor
			self.lineWidth = lineWidth
		}
	}
}