//
//  User.swift
//  Meshtastic Apple
//
//  Copyright (c) Garth Vander Houwen 6/27/22.
//
import SwiftUI
import CoreData

struct UserConfig: View {

	@Environment(\.managedObjectContext) var context
	@EnvironmentObject var bleManager: BLEManager
	@Environment(\.dismiss) private var goBack

	var node: NodeInfoEntity?

	enum Field: Hashable {
		case frequencyOverride
	}

	@State private var isPresentingFactoryResetConfirm: Bool = false
	@State private var isPresentingSaveConfirm: Bool = false
	@State var hasChanges = false
	@State var shortName = ""
	@State var longName = ""
	@State var isLicensed = false
	@State var overrideDutyCycle = false
	@State var overrideFrequency: Float = 0.0
	@State var txPower = 0

	@FocusState var focusedField: Field?

	let floatFormatter: NumberFormatter = {
		let formatter = NumberFormatter()
		formatter.numberStyle = .decimal
		return formatter
	}()

	var body: some View {

		VStack {
			Form {
				Section(header: Text("User Details")) {
						HStack {
							Label(isLicensed ? "Call Sign" : "Long Name", systemImage: "person.crop.rectangle.fill")
							TextField("Long Name", text: $longName)
								.onChange(of: longName, perform: { _ in
									let totalBytes = longName.utf8.count
									// Only mess with the value if it is too big
									if totalBytes > (isLicensed ? 8 : 36) {
										let firstNBytes = Data(longName.utf8.prefix(isLicensed ? 8 : 36))
										if let maxBytesString = String(data: firstNBytes, encoding: String.Encoding.utf8) {
											// Set the longName back to the last place where it was the right size
											longName = maxBytesString
										}
									}
								})
						}
						.keyboardType(.default)
						.disableAutocorrection(true)
					Text("\(String(isLicensed ? "Call Sign" : "Long Name")) can be up to \(isLicensed ? "8" : "36") bytes long.")
							.font(.caption2)

					HStack {
						Label("Short Name", systemImage: "circlebadge.fill")
						TextField("Short Name", text: $shortName)
							.foregroundColor(.gray)
							.onChange(of: shortName, perform: { _ in
								let totalBytes = shortName.utf8.count
								// Only mess with the value if it is too big
								if totalBytes > 4 {
									let firstNBytes = Data(shortName.utf8.prefix(4))
									if let maxBytesString = String(data: firstNBytes, encoding: String.Encoding.utf8) {
										// Set the shortName back to the last place where it was the right size
										shortName = maxBytesString
									}
								}
							})
							.foregroundColor(.gray)
					}
					.keyboardType(.default)
					.disableAutocorrection(true)
					Text("The last 4 of the device MAC address will be appended to the short name to set the device's BLE Name.  Short name can be up to 4 bytes long.")
						.font(.caption2)

					// Only manage ham mode for the locally connected node
					if node?.num ?? 0 > 0 && node?.num ?? 0 == bleManager.connectedPeripheral?.num ?? 0 {
						Toggle(isOn: $isLicensed) {
							Label("Licensed Operator", systemImage: "person.text.rectangle")
						}
						.toggleStyle(SwitchToggleStyle(tint: .accentColor))
						if isLicensed {

							Text("Onboarding for licensed operators requires firmware 2.0.20 or greater. Make sure to refer to your local regulations and contact the local amateur frequency coordinators with questions.")
								.font(.caption2)
							Text("What licensed operator mode does:\n* Sets the node name to your call sign \n* Broadcasts node info every 10 minutes \n* Overrides frequency, dutycycle and tx power \n* Disables encryption")
								.font(.caption2)

							HStack {
								Label("Frequency", systemImage: "waveform.path.ecg")
								Spacer()
								TextField("Frequency Override", value: $overrideFrequency, formatter: floatFormatter)
									.toolbar {
										ToolbarItemGroup(placement: .keyboard) {
											Button("dismiss.keyboard") {
												focusedField = nil
											}
											.font(.subheadline)
										}
									}
									.keyboardType(.decimalPad)
									.scrollDismissesKeyboard(.immediately)
									.focused($focusedField, equals: .frequencyOverride)
							}
							HStack {
								Image(systemName: "antenna.radiowaves.left.and.right")
									.foregroundColor(.accentColor)
								Stepper("\(txPower)db Transmit Power", value: $txPower, in: 0...30, step: 1)
									.padding(5)
							}
						}
					}
				}
			}
			.disabled(bleManager.connectedPeripheral == nil)
			HStack {
				Button {
					isPresentingSaveConfirm = true
				} label: {
					Label("save", systemImage: "square.and.arrow.down")
				}
				.disabled(bleManager.connectedPeripheral == nil || !hasChanges)
				.buttonStyle(.bordered)
				.buttonBorderShape(.capsule)
				.controlSize(.large)
				.padding()
				.confirmationDialog(
					"are.you.sure",
					isPresented: $isPresentingSaveConfirm,
					titleVisibility: .visible
				) {
					Button("Save User Config to \(node?.user?.longName ?? "Unknown")?") {

						let connectedUser = getUser(id: bleManager.connectedPeripheral?.num ?? -1, context: context)
						let connectedNode = getNodeInfo(id: bleManager.connectedPeripheral?.num ?? -1, context: context)
						if node != nil && connectedNode != nil {

							if !isLicensed {
								var u = User()
								u.shortName = shortName
								u.longName = longName
								let adminMessageId = bleManager.saveUser(config: u, fromUser: connectedUser, toUser: node!.user!, adminIndex: connectedNode?.myInfo?.adminIndex ?? 0)
								if adminMessageId > 0 {
									hasChanges = false
									goBack()
								}
							} else {
								var ham = HamParameters()
								// ham.shortName = shortName
								ham.callSign = longName
								ham.txPower = Int32(txPower)
								ham.frequency = overrideFrequency
								let adminMessageId = bleManager.saveLicensedUser(ham: ham, fromUser: connectedUser, toUser: node!.user!, adminIndex: connectedNode?.myInfo?.adminIndex ?? 0)
								if adminMessageId > 0 {
									hasChanges = false
									goBack()
								}
							}
						}
					}
				} message: {
					Text("config.save.confirm")
				}
			}
			Spacer()
		}
		.navigationTitle("User Config")
		.navigationBarItems(trailing:
								ZStack {
			ConnectedDevice(bluetoothOn: bleManager.isSwitchedOn, deviceConnected: bleManager.connectedPeripheral != nil, name: (bleManager.connectedPeripheral != nil) ? bleManager.connectedPeripheral.shortName : "????")
		})
		.onAppear {
			self.bleManager.context = context
			self.shortName = node?.user?.shortName ?? ""
			self.longName = node?.user?.longName ?? ""
			self.isLicensed = node?.user?.isLicensed ?? false
			self.txPower = Int(node?.loRaConfig?.txPower ?? 0)
			self.overrideFrequency = node?.loRaConfig?.overrideFrequency ?? 0.00
			self.hasChanges = false
		}
		.onChange(of: shortName) { newShort in
			if node != nil && node!.user != nil {
				if newShort != node?.user!.shortName { hasChanges = true }
			}
		}
		.onChange(of: longName) { newLong in
			if node != nil && node!.user != nil {
				if newLong != node?.user!.longName { hasChanges = true }
			}
		}
		.onChange(of: isLicensed) { newIsLicensed in
			if node != nil && node!.user != nil {
				if newIsLicensed != node?.user!.isLicensed { hasChanges = true }
			}
		}
		.onChange(of: overrideFrequency) { _ in
			// hasChanges = true
		}
		.onChange(of: txPower) { _ in
			// hasChanges = true
		}
	}
}