//
//  NetworkConfig.swift
//  Meshtastic
//
//  Copyright (c) Garth Vander Houwen 8/1/2022
//
import MeshtasticProtobufs
import OSLog
import SwiftUI

struct NetworkConfig: View {

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

	var node: NodeInfoEntity?

	@State var hasChanges: Bool = false
	@State var wifiEnabled = false
	@State var wifiSsid = ""
	@State var wifiPsk = ""
	@State var wifiMode = 0
	@State var ntpServer = ""
	@State var ethEnabled = false
	@State var ethMode = 0

	var body: some View {
		VStack {
			Form {
				ConfigHeader(title: "Network", config: \.networkConfig, node: node, onAppear: setNetworkValues)

				if node != nil && node?.metadata?.hasWifi ?? false {
					Section(header: Text("WiFi Options")) {

						Toggle(isOn: $wifiEnabled) {
							Label("enabled", systemImage: "wifi")
							Text("Enabling WiFi will disable the bluetooth connection to the app.")
						}
						.toggleStyle(SwitchToggleStyle(tint: .accentColor))

						HStack {
							Label("ssid", systemImage: "network")
							TextField("ssid", text: $wifiSsid)
								.foregroundColor(.gray)
								.autocapitalization(.none)
								.disableAutocorrection(true)
								.onChange(of: wifiSsid) {
									var totalBytes = wifiSsid.utf8.count
									// Only mess with the value if it is too big
									while totalBytes > 32 {
										wifiSsid = String(wifiSsid.dropLast())
										totalBytes = wifiSsid.utf8.count
									}
									hasChanges = true
								}
								.foregroundColor(.gray)
						}
						.keyboardType(.default)
						HStack {
							Label("password", systemImage: "wallet.pass")
							TextField("password", text: $wifiPsk)
								.foregroundColor(.gray)
								.autocapitalization(.none)
								.disableAutocorrection(true)
								.onChange(of: wifiPsk) {
									var totalBytes = wifiPsk.utf8.count
									// Only mess with the value if it is too big
									while totalBytes > 63 {
										wifiPsk = String(wifiPsk.dropLast())
										totalBytes = wifiPsk.utf8.count
									}
									hasChanges = true
								}
								.foregroundColor(.gray)
						}
						.keyboardType(.default)
					}
				}
				if node != nil && node?.metadata?.hasEthernet ?? false {
					Section(header: Text("Ethernet Options")) {
						Toggle(isOn: $ethEnabled) {
							Label("enabled", systemImage: "network")
							Text("Enabling Ethernet will disable the bluetooth connection to the app.")
						}
						.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					}
				}
			}
			.scrollDismissesKeyboard(.interactively)
			.disabled(self.bleManager.connectedPeripheral == nil || node?.networkConfig == nil)

			SaveConfigButton(node: node, hasChanges: $hasChanges) {
				let connectedNode = getNodeInfo(id: bleManager.connectedPeripheral.num, context: context)
				if connectedNode != nil {
					var network = Config.NetworkConfig()
					network.wifiEnabled = self.wifiEnabled
					network.wifiSsid = self.wifiSsid
					network.wifiPsk = self.wifiPsk
					network.ethEnabled = self.ethEnabled
					// network.addressMode = Config.NetworkConfig.AddressMode.dhcp

					let adminMessageId =  bleManager.saveNetworkConfig(config: network, 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()
					}
				}
			}
		}
		.navigationTitle("network.config")
		.navigationBarItems(
			trailing: ZStack {
				ConnectedDevice(
					bluetoothOn: bleManager.isSwitchedOn,
					deviceConnected: bleManager.connectedPeripheral != nil,
					name: bleManager.connectedPeripheral?.shortName ?? "?"
				)
			}
		)
		.onAppear {
			// Need to request a NetworkConfig from the remote node before allowing changes
			if bleManager.connectedPeripheral != nil && node?.networkConfig == nil {
				Logger.mesh.info("empty network config")
				let connectedNode = getNodeInfo(id: bleManager.connectedPeripheral.num, context: context)
				if node != nil && connectedNode != nil {
					_ = bleManager.requestNetworkConfig(fromUser: connectedNode!.user!, toUser: node!.user!, adminIndex: connectedNode?.myInfo?.adminIndex ?? 0)
				}
			}
		}
		.onFirstAppear {
			// Need to request a NetworkConfig from the remote node before allowing changes
			if let connectedPeripheral = bleManager.connectedPeripheral, let node {
				Logger.mesh.info("empty network config")
				let connectedNode = getNodeInfo(id: connectedPeripheral.num, context: context)
				if let connectedNode {
					if node.num != connectedNode.num {
						if UserDefaults.enableAdministration {
							/// 2.5 Administration with session passkey
							let expiration = node.sessionExpiration ?? Date()
							if expiration < Date() || node.networkConfig == nil {
								_ = bleManager.requestNetworkConfig(fromUser: connectedNode.user!, toUser: node.user!, adminIndex: connectedNode.myInfo?.adminIndex ?? 0)
							}
						} else {
							/// Legacy Administration
							_ = bleManager.requestNetworkConfig(fromUser: connectedNode.user!, toUser: node.user!, adminIndex: connectedNode.myInfo?.adminIndex ?? 0)
						}
					}
				}
			}
		}
		.onChange(of: wifiEnabled) { _, newEnabled in
			if newEnabled != node?.networkConfig?.wifiEnabled { hasChanges = true }
		}
		.onChange(of: wifiSsid) { _, newSSID in
			if newSSID != node?.networkConfig?.wifiSsid { hasChanges = true }
		}
		.onChange(of: wifiPsk) { _, newPsk in
			if newPsk != node?.networkConfig?.wifiPsk { hasChanges = true }
		}
		.onChange(of: wifiMode) { _, newMode in
			if newMode != node?.networkConfig?.wifiMode ?? -1 { hasChanges = true }
		}
		.onChange(of: ethEnabled) { _, newEthEnabled in
			if newEthEnabled != node?.networkConfig?.ethEnabled { hasChanges = true }
		}
	}
	func setNetworkValues() {
		self.wifiEnabled = node?.networkConfig?.wifiEnabled ?? false
		self.wifiSsid = node?.networkConfig?.wifiSsid ?? ""
		self.wifiPsk = node?.networkConfig?.wifiPsk ?? ""
		self.wifiMode = Int(node?.networkConfig?.wifiMode ?? 0)
		self.ethEnabled = node?.networkConfig?.ethEnabled ?? false
		self.hasChanges = false
	}
}