Meshtastic-Apple/Meshtastic/Views/Settings/ShareChannels.swift

//
//  ShareChannel.swift
//  MeshtasticApple
//
//  Copyright(c) Garth Vander Houwen 4/8/22.
//
import SwiftUI
import CoreData
import CoreImage.CIFilterBuiltins

struct QrCodeImage {
	let context = CIContext()

	func generateQRCode(from text: String) -> UIImage {
		var qrImage = UIImage(systemName: "xmark.circle") ?? UIImage()
		let data = Data(text.utf8)
		let filter = CIFilter.qrCodeGenerator()
		filter.setValue(data, forKey: "inputMessage")

		let transform = CGAffineTransform(scaleX: 20, y: 20)
		if let outputImage = filter.outputImage?.transformed(by: transform) {
			if let image = context.createCGImage(
				outputImage,
				from: outputImage.extent) {
				qrImage = UIImage(cgImage: image)
			}
		}
		return qrImage
	}
}

struct ShareChannels: View {

	@Environment(\.managedObjectContext) var context
	@EnvironmentObject var bleManager: BLEManager
	@Environment(\.dismiss) private var dismiss
	@State var channelSet: ChannelSet = ChannelSet()
	@State var includeChannel0 = true
	@State var includeChannel1 = true
	@State var includeChannel2 = true
	@State var includeChannel3 = true
	@State var includeChannel4 = true
	@State var includeChannel5 = true
	@State var includeChannel6 = true
	@State var includeChannel7 = true
	@State var isPresentingHelp = false
	var node: NodeInfoEntity?
	@State private var channelsUrl =  "https://www.meshtastic.org/e/#"
	var qrCodeImage = QrCodeImage()

	var body: some View {
		GeometryReader { bounds in
			let smallest = min(bounds.size.width, bounds.size.height)
			ScrollView {
					if node != nil && node?.myInfo != nil {
						Grid {
							GridRow {
								Spacer()
								Text("include")
									.font(.caption)
									.fontWeight(.bold)
									.padding(.trailing)
								Text("channel")
									.font(.caption)
									.fontWeight(.bold)
									.padding(.trailing)
								Text("encrypted")
									.font(.caption)
									.fontWeight(.bold)
							}
							ForEach(node?.myInfo?.channels?.array as? [ChannelEntity] ?? [], id: \.self) { (channel: ChannelEntity) in
								GridRow {
									Spacer()
									if channel.index == 0 {
										Toggle("Channel 0 Included", isOn: $includeChannel0)
											.toggleStyle(.switch)
											.labelsHidden()
										Text(((channel.name!.isEmpty ? "Primary" : channel.name) ?? "Primary").camelCaseToWords())
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									} else if channel.index == 1 && channel.role > 0 {
										Toggle("Channel 1 Included", isOn: $includeChannel1)
											.toggleStyle(.switch)
											.labelsHidden()
											.disabled(channel.role == 1)
										Text(((channel.name!.isEmpty ? "Channel\(channel.index)" : channel.name) ?? "Channel\(channel.index)").camelCaseToWords()).fixedSize()
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									} else if channel.index == 2 && channel.role > 0 {
										Toggle("Channel 2 Included", isOn: $includeChannel2)
											.toggleStyle(.switch)
											.labelsHidden()
											.disabled(channel.role == 1)
										Text(((channel.name!.isEmpty ? "Channel\(channel.index)" : channel.name) ?? "Channel\(channel.index)").camelCaseToWords()).fixedSize()
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									} else if channel.index == 3 && channel.role > 0 {
										Toggle("Channel 3 Included", isOn: $includeChannel3)
											.toggleStyle(.switch)
											.labelsHidden()
											.disabled(channel.role == 1)
										Text(((channel.name!.isEmpty ? "Channel\(channel.index)" : channel.name) ?? "Channel\(channel.index)").camelCaseToWords()).fixedSize()
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									} else if channel.index == 4  && channel.role > 0 {
										Toggle("Channel 4 Included", isOn: $includeChannel4)
											.toggleStyle(.switch)
											.labelsHidden()
											.disabled(channel.role == 1)
										Text(((channel.name!.isEmpty ? "Channel\(channel.index)" : channel.name) ?? "Channel\(channel.index)").camelCaseToWords()).fixedSize()
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									} else if channel.index == 5 && channel.role > 0 {
										Toggle("Channel 5 Included", isOn: $includeChannel5)
											.toggleStyle(.switch)
											.labelsHidden()
											.disabled(channel.role == 1)
										Text(((channel.name!.isEmpty ? "Channel\(channel.index)" : channel.name) ?? "Channel\(channel.index)").camelCaseToWords()).fixedSize()
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									} else if channel.index == 6  && channel.role > 0 {
										Toggle("Channel 6 Included", isOn: $includeChannel6)
											.toggleStyle(.switch)
											.labelsHidden()
											.disabled(channel.role == 1)
										Text(((channel.name!.isEmpty ? "Channel\(channel.index)" : channel.name) ?? "Channel\(channel.index)").camelCaseToWords()).fixedSize()
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									} else if channel.index == 7 && channel.role > 0 {
										Toggle("Channel 7 Included", isOn: $includeChannel7)
											.toggleStyle(.switch)
											.labelsHidden()
											.disabled(channel.role == 1)
										Text(((channel.name!.isEmpty ? "Channel\(channel.index)" : channel.name) ?? "Channel\(channel.index)").camelCaseToWords()).fixedSize()
										if channel.psk?.hexDescription.count ??  0 <  3 {
											Image(systemName: "lock.slash")
												.foregroundColor(.red)
										} else {
											Image(systemName: "lock.fill")
												.foregroundColor(.green)
										}
									}
									Spacer()
								}
							}
						}

						let qrImage = qrCodeImage.generateQRCode(from: channelsUrl)
						VStack {
							if node != nil {
								ShareLink("Share QR Code & Link",
											item: Image(uiImage: qrImage),
											subject: Text("Meshtastic Node \(node?.user?.shortName ?? "????") has shared channels with you"),
											message: Text(channelsUrl),
											preview: SharePreview("Meshtastic Node \(node?.user?.shortName ?? "????") has shared channels with you",
																image: Image(uiImage: qrImage))
								)
								.buttonStyle(.bordered)
								.buttonBorderShape(.capsule)
								.controlSize(.large)
								.padding(.bottom)

								Image(uiImage: qrImage)
									.resizable()
									.scaledToFit()
									.frame(
										minWidth: smallest * 0.95,
										maxWidth: smallest * 0.95,
										minHeight: smallest * 0.95,
										maxHeight: smallest * 0.95,
										alignment: .top
									)
								Button {
									isPresentingHelp = true
								} label: {
									Label("Help Me!", systemImage: "lifepreserver")
								}
								.buttonStyle(.bordered)
								.buttonBorderShape(.capsule)
								.controlSize(.small)
							}
						}
					}
			}
			.sheet(isPresented: $isPresentingHelp) {
				VStack {
					Text("Meshtastic Channels").font(.title)
					Text("A Meshtastic LoRa Mesh network can have up to 8 distinct channels.")
						.font(.headline)
						.padding(.bottom)
					Text("Primary Channel").font(.title2)
					Text("The first channel is the Primary channel and is where much of the mesh activity takes place. DM's are only available on the primary channel and it can not be disabled. If you don't share your primary channel, the first channel will become the primary channel on the other network and will allow communication with your mesh on the group channel.")
						.font(.callout)
						.padding([.leading, .trailing, .bottom])
					Text("Admin Channel").font(.title2)
					Text("A channel with the name 'admin' is the Admin channel and can be used to remotely administer nodes on your mesh, text messages can not be sent over the admin channel.")
						.font(.callout)
						.padding([.leading, .trailing, .bottom])
					Text("Private Channels").font(.title2)
					Text("The other channels can be used for private group converations. Each of these groups has its own encryption key.")
						.font(.callout)
						.padding([.leading, .trailing, .bottom])
					Divider()
				}
				.padding()
				.presentationDetents([.large])
				.presentationDragIndicator(.automatic)

				#if targetEnvironment(macCatalyst)
					Button {
						isPresentingHelp = false
					} label: {
						Label("close", systemImage: "xmark")
					}
					.buttonStyle(.bordered)
					.buttonBorderShape(.capsule)
					.controlSize(.large)
					.padding()
				#endif
			}
			.navigationTitle("generate.qr.code")
			.navigationBarTitleDisplayMode(.inline)
			.navigationBarItems(trailing:
			ZStack {
				ConnectedDevice(bluetoothOn: bleManager.isSwitchedOn, deviceConnected: bleManager.connectedPeripheral != nil, name: (bleManager.connectedPeripheral != nil) ? bleManager.connectedPeripheral.shortName : "????")
			})
			.onAppear {
				bleManager.context = context
				generateChannelSet()
			}
			.onChange(of: includeChannel0) { _ in generateChannelSet()	}
			.onChange(of: includeChannel1) { _ in generateChannelSet()	}
			.onChange(of: includeChannel2) { _ in generateChannelSet()	}
			.onChange(of: includeChannel3) { _ in generateChannelSet()	}
			.onChange(of: includeChannel4) { _ in generateChannelSet()	}
			.onChange(of: includeChannel5) { _ in generateChannelSet()	}
			.onChange(of: includeChannel6) { _ in generateChannelSet() }
			.onChange(of: includeChannel7) { _ in generateChannelSet() }
		}
	}
	func generateChannelSet() {
		channelSet = ChannelSet()
		var loRaConfig = Config.LoRaConfig()
		loRaConfig.region =  RegionCodes(rawValue: Int(node?.loRaConfig?.regionCode ?? 0))!.protoEnumValue()
		loRaConfig.modemPreset = ModemPresets(rawValue: Int(node?.loRaConfig?.modemPreset ?? 0))!.protoEnumValue()
		loRaConfig.bandwidth = UInt32(node?.loRaConfig?.bandwidth ?? 0)
		loRaConfig.spreadFactor = UInt32(node?.loRaConfig?.spreadFactor ?? 0)
		loRaConfig.codingRate = UInt32(node?.loRaConfig?.codingRate ?? 0)
		loRaConfig.frequencyOffset = node?.loRaConfig?.frequencyOffset ?? 0
		loRaConfig.hopLimit = UInt32(node?.loRaConfig?.hopLimit ?? 3)
		loRaConfig.txEnabled = node?.loRaConfig?.txEnabled ?? false
		loRaConfig.txPower = node?.loRaConfig?.txPower ?? 0
		loRaConfig.usePreset = node?.loRaConfig?.usePreset ?? true
		loRaConfig.channelNum = UInt32(node?.loRaConfig?.channelNum ?? 0)
		loRaConfig.sx126XRxBoostedGain = node?.loRaConfig?.sx126xRxBoostedGain ?? false
		channelSet.loraConfig = loRaConfig
		if node?.myInfo?.channels != nil && node?.myInfo?.channels?.count ?? 0 > 0 {
			for ch in node?.myInfo?.channels?.array as? [ChannelEntity] ?? [] {
				if ch.role > 0 {

					if ch.index == 0 && includeChannel0 || ch.index == 1 && includeChannel1 || ch.index == 2 && includeChannel2 || ch.index == 3 && includeChannel3 ||
						ch.index == 4 && includeChannel4 || ch.index == 5 && includeChannel5 || ch.index == 6 && includeChannel6 || ch.index == 7 && includeChannel7 {

						var channelSettings = ChannelSettings()
							channelSettings.name = ch.name!
							channelSettings.psk = ch.psk!
							channelSettings.id = UInt32(ch.id)
							channelSettings.uplinkEnabled = ch.uplinkEnabled
							channelSettings.downlinkEnabled = ch.downlinkEnabled
							channelSet.settings.append(channelSettings)
					}
				}
			}
			let settingsString = try! channelSet.serializedData().base64EncodedString()
			channelsUrl = ("https://meshtastic.org/e/#" + settingsString.base64ToBase64url())
		}
	}
}