//
//  MQTT.swift
//  Meshtastic
//
//  Copyright (c) Garth Vander Houwen 9/4/22.
//
import SwiftUI

struct MQTTConfig: View {

	@Environment(\.managedObjectContext) var context
	@EnvironmentObject var bleManager: BLEManager
	@Environment(\.dismiss) private var goBack
	var node: NodeInfoEntity?
	@State private var isPresentingSaveConfirm: Bool = false
	@State var hasChanges: Bool = false
	@State var enabled = false
	@State var proxyToClientEnabled = false
	@State var address = ""
	@State var username = ""
	@State var password = ""
	@State var encryptionEnabled = true
	@State var jsonEnabled = false
	@State var tlsEnabled = true
	@State var root = "msh"
	@State var mqttConnected: Bool = false
	
	

	var body: some View {
		VStack {
			Form {
				if node != nil && node?.loRaConfig != nil {
					let rc = RegionCodes(rawValue: Int(node?.loRaConfig?.regionCode ?? 0))
					if rc?.dutyCycle ?? 0 <= 10 {
						Text("Your region has a \(rc?.dutyCycle ?? 0)% duty cycle. MQTT is not advised when you are duty cycle restricted, the extra traffic will quickly overwhelm your LoRa mesh.")
							.font(.callout)
							.foregroundColor(.red)
					}
				}

				ConfigHeader(title: "MQTT", config: \.mqttConfig, node: node, onAppear: setMqttValues)

				Section(header: Text("options")) {
					
					Toggle(isOn: $enabled) {
						
						Label("enabled", systemImage: "dot.radiowaves.right")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					Toggle(isOn: $proxyToClientEnabled) {
						
						Label("mqtt.clientproxy", systemImage: "iphone.radiowaves.left.and.right")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					if enabled && proxyToClientEnabled {
						Toggle(isOn: $mqttConnected) {
							Label(mqttConnected ? "mqtt.disconnect".localized : "mqtt.connect".localized, systemImage: "server.rack")
						}
						.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					}
					Text("If both MQTT and the client proxy are enabled your mobile device will utilize an available network connection to connect to the specified MQTT server.")
						.font(.caption2)
					
					Toggle(isOn: $encryptionEnabled) {
						
						Label("Encryption Enabled", systemImage: "lock.icloud")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					
					Toggle(isOn: $jsonEnabled) {
						
						Label("JSON Enabled", systemImage: "ellipsis.curlybraces")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					Text("JSON mode is a limited, unencrypted MQTT output that can crash your node it should not be enabled unless you are locally integrating with home assistant")
						.font(.caption2)
					
					Toggle(isOn: $tlsEnabled) {
						
						Label("TLS Enabled", systemImage: "checkmark.shield.fill")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					Text("Your MQTT Server must support TLS.")
						.font(.caption2)
				}
				Section(header: Text("Custom Server")) {
					HStack {
						Label("Address", systemImage: "server.rack")
						TextField("Server Address", text: $address)
							.foregroundColor(.gray)
							.autocapitalization(.none)
							.disableAutocorrection(true)
							.onChange(of: address, perform: { _ in
								let totalBytes = address.utf8.count
								// Only mess with the value if it is too big
								if totalBytes > 62 {
									let firstNBytes = Data(username.utf8.prefix(62))
									if let maxBytesString = String(data: firstNBytes, encoding: String.Encoding.utf8) {
										// Set the shortName back to the last place where it was the right size
										address = maxBytesString
									}
								}
								hasChanges = true
							})
							.foregroundColor(.gray)
							.keyboardType(.default)
					}
					.autocorrectionDisabled()
					
					HStack {
						Label("mqtt.username", systemImage: "person.text.rectangle")
						TextField("mqtt.username", text: $username)
							.foregroundColor(.gray)
							.autocapitalization(.none)
							.disableAutocorrection(true)
							.onChange(of: username, perform: { _ in
								
								let totalBytes = username.utf8.count
								
								// Only mess with the value if it is too big
								if totalBytes > 62 {
									
									let firstNBytes = Data(username.utf8.prefix(62))
									
									if let maxBytesString = String(data: firstNBytes, encoding: String.Encoding.utf8) {
										
										// Set the shortName back to the last place where it was the right size
										username = maxBytesString
									}
								}
								hasChanges = true
							})
							.foregroundColor(.gray)
					}
					.keyboardType(.default)
					.scrollDismissesKeyboard(.interactively)
					HStack {
						Label("password", systemImage: "wallet.pass")
						TextField("password", text: $password)
							.foregroundColor(.gray)
							.autocapitalization(.none)
							.disableAutocorrection(true)
							.onChange(of: password, perform: { _ in
								
								let totalBytes = password.utf8.count
								
								// Only mess with the value if it is too big
								if totalBytes > 62 {
									
									let firstNBytes = Data(password.utf8.prefix(62))
									
									if let maxBytesString = String(data: firstNBytes, encoding: String.Encoding.utf8) {
										
										// Set the shortName back to the last place where it was the right size
										password = maxBytesString
									}
								}
								hasChanges = true
							})
							.foregroundColor(.gray)
					}
					.keyboardType(.default)
					.scrollDismissesKeyboard(.interactively)
					HStack {
						Label("Root Topic", systemImage: "tree")
						TextField("Root Topic", text: $root)
							.foregroundColor(.gray)
							.onChange(of: root, perform: { _ in
								let totalBytes = root.utf8.count
								// Only mess with the value if it is too big
								if totalBytes > 14 {
									let firstNBytes = Data(root.utf8.prefix(14))
									if let maxBytesString = String(data: firstNBytes, encoding: String.Encoding.utf8) {
										// Set the shortName back to the last place where it was the right size
										root = maxBytesString
									}
								}
							})
							.foregroundColor(.gray)
					}
					.keyboardType(.asciiCapable)
					.scrollDismissesKeyboard(.interactively)
					.disableAutocorrection(true)
					Text("The root topic to use for MQTT messages. Default is \"msh\". This is useful if you want to use a single MQTT server for multiple meshtastic networks and separate them via ACLs")
						.font(.caption2)
				}
				Text("You can set uplink and downlink for each channel.")
					.font(.callout)
			}
			.scrollDismissesKeyboard(.interactively)
			.disabled(self.bleManager.connectedPeripheral == nil || node?.mqttConfig == nil)
		}
		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
		) {
			let connectedNode = getNodeInfo(id: bleManager.connectedPeripheral?.num ?? -1, context: context)
			if connectedNode != nil {
				let nodeName = node?.user?.longName ?? "unknown".localized
				let buttonText = String.localizedStringWithFormat("save.config %@".localized, nodeName)
				Button(buttonText) {
					var mqtt = ModuleConfig.MQTTConfig()
					mqtt.enabled = self.enabled
					mqtt.proxyToClientEnabled = self.proxyToClientEnabled
					mqtt.address = self.address
					mqtt.username = self.username
					mqtt.password = self.password
					mqtt.root = self.root
					mqtt.encryptionEnabled = self.encryptionEnabled
					mqtt.jsonEnabled = self.jsonEnabled
					mqtt.tlsEnabled = self.tlsEnabled
					let adminMessageId =  bleManager.saveMQTTConfig(config: mqtt, fromUser: connectedNode!.user!, toUser: node!.user!, adminIndex: connectedNode?.myInfo?.adminIndex ?? 0)
					if adminMessageId > 0 {
						// Should show a saved successfully alert once I know that to be true
						// for now just disable the button after a successful save
						hasChanges = false
						goBack()
					}
				}
			}
		}
		message: {
			Text("config.save.confirm")
		}
		.navigationTitle("mqtt.config")
		.navigationBarItems(trailing:
			ZStack {
			ConnectedDevice(bluetoothOn: bleManager.isSwitchedOn, deviceConnected: bleManager.connectedPeripheral != nil, name: (bleManager.connectedPeripheral != nil) ? bleManager.connectedPeripheral.shortName : "?", mqttProxyConnected: bleManager.mqttProxyConnected)
		})
		.onAppear {
			if self.bleManager.context == nil {
				self.bleManager.context = context
			}
			setMqttValues()
			// Need to request a TelemetryModuleConfig from the remote node before allowing changes
			if bleManager.connectedPeripheral != nil && node?.mqttConfig == nil {
				print("empty mqtt module config")
				let connectedNode = getNodeInfo(id: bleManager.connectedPeripheral.num, context: context)
				if node != nil && connectedNode != nil {
					_ = bleManager.requestMqttModuleConfig(fromUser: connectedNode!.user!, toUser: node!.user!, adminIndex: connectedNode?.myInfo?.adminIndex ?? 0)
				}
			}
		}
		.onChange(of: address) { newAddress in
			if node != nil && node?.mqttConfig != nil {
				if newAddress != node!.mqttConfig!.address { hasChanges = true }
			}
		}
		.onChange(of: username) { newUsername in
			if node != nil && node?.mqttConfig != nil {
				if newUsername != node!.mqttConfig!.username { hasChanges = true }
			}
		}
		.onChange(of: password) { newPassword in
			if node != nil && node?.mqttConfig != nil {
				if newPassword != node!.mqttConfig!.password { hasChanges = true }
			}
		}
		.onChange(of: root) { newRoot in
			if node != nil && node?.mqttConfig != nil {
				if newRoot != node!.mqttConfig!.root { hasChanges = true }
			}
		}
		.onChange(of: enabled) { newEnabled in
			if node != nil && node?.mqttConfig != nil {
				if newEnabled != node!.mqttConfig!.enabled { hasChanges = true }
			}
		}
		.onChange(of: proxyToClientEnabled) { newProxyToClientEnabled in
			if node != nil && node?.mqttConfig != nil {
				if newProxyToClientEnabled != node!.mqttConfig!.proxyToClientEnabled { hasChanges = true }
				if newProxyToClientEnabled {
					jsonEnabled = false
				}
			}
		}
		.onChange(of: encryptionEnabled) { newEncryptionEnabled in
			if node != nil && node?.mqttConfig != nil {
				if newEncryptionEnabled != node!.mqttConfig!.encryptionEnabled { hasChanges = true }
			}
		}
		.onChange(of: jsonEnabled) { newJsonEnabled in
			if node != nil && node?.mqttConfig != nil {
				if newJsonEnabled != node!.mqttConfig!.jsonEnabled { hasChanges = true }
			}
		}
		.onChange(of: tlsEnabled) { newTlsEnabled in
			if node != nil && node?.mqttConfig != nil {
				if newTlsEnabled != node!.mqttConfig!.tlsEnabled { hasChanges = true }
			}
		}
		.onChange(of: mqttConnected) { newMqttConnected in
			if newMqttConnected == false {
				if bleManager.mqttProxyConnected {
					bleManager.mqttManager.disconnect()
				}
			} else {
				if !bleManager.mqttProxyConnected && node != nil {
					bleManager.mqttManager.connectFromConfigSettings(node: node!)
				}
			}
		}
	}
	func setMqttValues() {
		self.enabled = (node?.mqttConfig?.enabled ?? false)
		self.proxyToClientEnabled = (node?.mqttConfig?.proxyToClientEnabled ?? false)
		self.address = node?.mqttConfig?.address ?? ""
		self.username = node?.mqttConfig?.username ?? ""
		self.password = node?.mqttConfig?.password ?? ""
		self.root = node?.mqttConfig?.root ?? "msh"
		self.encryptionEnabled = (node?.mqttConfig?.encryptionEnabled ?? false)
		self.jsonEnabled = (node?.mqttConfig?.jsonEnabled ?? false)
		self.tlsEnabled = (node?.mqttConfig?.tlsEnabled ?? false)
		self.mqttConnected = bleManager.mqttProxyConnected
		self.hasChanges = false
	}
}