Show coordinates in multiple formats

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// Copyright 2023 Esri
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import ArcGIS
import SwiftUI

struct ShowCoordinatesInMultipleFormatsView: View {
    /// The view model for the sample.
    @StateObject private var model = Model()

    /// The tapped point on the map.
    @State private var tappedPoint = Point(latitude: 0, longitude: 0)

    var body: some View {
        // Input text fields.
        VStack {
            CoordinateTextField(
                title: "Decimal Degrees",
                text: $model.latLongDDString
            )
            .onSubmit {
                if let point = CoordinateFormatter.point(
                    fromLatitudeLongitudeString: model.latLongDDString,
                    spatialReference: tappedPoint.spatialReference
                ) {
                    model.updateCoordinates(point: point)
                } else {
                    model.updateCoordinates(point: tappedPoint)
                }
            }
            CoordinateTextField(
                title: "Degrees, Minutes, Seconds",
                text: $model.latLongDMSString
            )
            .onSubmit {
                if let point = CoordinateFormatter.point(
                    fromLatitudeLongitudeString: model.latLongDMSString,
                    spatialReference: tappedPoint.spatialReference
                ) {
                    model.updateCoordinates(point: point)
                } else {
                    model.updateCoordinates(point: tappedPoint)
                }
            }
            CoordinateTextField(
                title: "UTM",
                text: $model.utmString
            )
            .onSubmit {
                if let point = CoordinateFormatter.point(
                    fromUTMString: model.utmString,
                    spatialReference: tappedPoint.spatialReference,
                    conversionMode: .latitudeBandIndicators
                ) {
                    model.updateCoordinates(point: point)
                } else {
                    model.updateCoordinates(point: tappedPoint)
                }
            }
            CoordinateTextField(
                title: "USNG",
                text: $model.usngString
            )
            .onSubmit {
                if let point = CoordinateFormatter.point(
                    fromUSNGString: model.usngString,
                    spatialReference: tappedPoint.spatialReference
                ) {
                    model.updateCoordinates(point: point)
                } else {
                    model.updateCoordinates(point: tappedPoint)
                }
            }

            MapView(map: model.map, graphicsOverlays: [model.graphicsOverlay])
                .onSingleTapGesture { _, mapPoint in
                    // Updates the `mapPoint`, its graphic, and the corresponding coordinates.
                    self.tappedPoint = mapPoint
                    model.updateCoordinates(point: mapPoint)
                }
        }
    }
}

private struct CoordinateTextField: View {
    /// The title of the text field.
    var title: String

    /// The text in the text field.
    @Binding var text: String

    var body: some View {
        VStack(alignment: .leading) {
            Text(title)
                .padding([.leading, .top], 8)
                .padding(.bottom, -5)
            TextField("", text: $text)
                .textInputAutocapitalization(.never)
                .autocorrectionDisabled()
                .textFieldStyle(.roundedBorder)
                .padding([.leading, .trailing, .bottom], 8)
        }
    }
}

private extension ShowCoordinatesInMultipleFormatsView {
    // The view model for the sample.
    class Model: ObservableObject {
        /// A map with an imagery basemap.
        let map = Map(basemapStyle: .arcGISImageryStandard)

        /// The graphics overlay for the point graphic.
        let graphicsOverlay: GraphicsOverlay

        /// A yellow cross graphic for the map point.
        private let pointGraphic = Graphic(symbol: SimpleMarkerSymbol(style: .cross, color: .yellow, size: 20))

        /// The decimal degrees text.
        @Published var latLongDDString = ""

        /// The degree minute seconds text.
        @Published var latLongDMSString = ""

        /// The UTM text.
        @Published var utmString = ""

        /// The USNG text.
        @Published var usngString = ""

        init() {
            graphicsOverlay = GraphicsOverlay(graphics: [pointGraphic])
            updateCoordinates(point: Point(latitude: 0, longitude: 0))
        }

        /// Updates the map point graphic and the corresponding coordinates.
        /// - Parameter point: A `Point` used to update.
        func updateCoordinates(point: Point) {
            pointGraphic.geometry = point
            updateCoordinateFields(mapPoint: point)
        }

        /// Generates and updates the coordinate strings using the coordinate formatter.
        /// - Parameter mapPoint: A `Point` to get coordinates from.
        private func updateCoordinateFields(mapPoint: Point) {
            latLongDDString = CoordinateFormatter.latitudeLongitudeString(
                from: mapPoint,
                format: .decimalDegrees,
                decimalPlaces: 4
            )

            latLongDMSString = CoordinateFormatter.latitudeLongitudeString(
                from: mapPoint,
                format: .degreesMinutesSeconds,
                decimalPlaces: 1
            )

            utmString = CoordinateFormatter.utmString(
                from: mapPoint,
                conversionMode: .latitudeBandIndicators,
                addSpaces: true
            )

            usngString = CoordinateFormatter.usngString(
                from: mapPoint,
                precision: 4,
                addSpaces: true
            )
        }
    }
}

#Preview {
    ShowCoordinatesInMultipleFormatsView()
}