//
//  PositionConfig.swift
//  Meshtastic Apple
//
//  Copyright (c) Garth Vander Houwen 6/11/22.
//

import SwiftUI

struct PositionFlags: OptionSet {
	let rawValue: Int

	static let Altitude = PositionFlags(rawValue: 1)
	static let AltitudeMsl = PositionFlags(rawValue: 2)
	static let GeoidalSeparation = PositionFlags(rawValue: 4)
	static let Dop = PositionFlags(rawValue: 8)
	static let Hvdop = PositionFlags(rawValue: 16)
	static let Satsinview = PositionFlags(rawValue: 32)
	static let SeqNo = PositionFlags(rawValue: 64)
	static let Timestamp = PositionFlags(rawValue: 128)
	static let Speed = PositionFlags(rawValue: 256)
	static let Heading = PositionFlags(rawValue: 512)
}

struct PositionConfig: View {

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

	var node: NodeInfoEntity?

	@State var hasChanges = false
	@State var hasFlagChanges = false

	@State var smartPositionEnabled = true
	@State var deviceGpsEnabled = true
	@State var gpsMode = 0
	@State var rxGpio = 0
	@State var txGpio = 0
	@State var gpsEnGpio = 0
	@State var fixedPosition = false
	@State var gpsUpdateInterval = 0
	@State var positionBroadcastSeconds = 0
	@State var broadcastSmartMinimumDistance = 0
	@State var broadcastSmartMinimumIntervalSecs = 0
	@State var positionFlags = 811

	/// Position Flags
	/// Altitude value - 1
	@State var includeAltitude = false
	/// Altitude value is MSL - 2
	@State var includeAltitudeMsl = false
	/// Include geoidal separation - 4
	@State var includeGeoidalSeparation = false
	/// Include the DOP value ; PDOP used by default, see below - 8
	@State var includeDop = false
	/// If POS_DOP set, send separate HDOP / VDOP values instead of PDOP - 16
	@State var includeHvdop = false
	/// Include number of "satellites in view" - 32
	@State var includeSatsinview = false
	/// Include a sequence number incremented per packet - 64
	@State var includeSeqNo = false
	/// Include positional timestamp (from GPS solution) - 128
	@State var includeTimestamp = false
	/// Include positional heading - 256
	/// Intended for use with vehicle not walking speeds
	/// walking speeds are likely to be error prone like the compass
	@State var includeSpeed = false
	/// Include positional speed - 512
	/// Intended for use with vehicle not walking speeds
	/// walking speeds are likely to be error prone like the compass
	@State var includeHeading = false

	/// Minimum Version for fixed postion admin messages
	@State var minimumVersion = "2.3.3"
	@State private var supportedVersion = true
	
	var body: some View {
		VStack {
			Form {
				ConfigHeader(title: "Position", config: \.positionConfig, node: node, onAppear: setPositionValues)

				Section(header: Text("Position Packet")) {

					VStack(alignment: .leading) {
						Picker("Broadcast Interval", selection: $positionBroadcastSeconds) {
							ForEach(UpdateIntervals.allCases) { at in
								if at.rawValue >= 300 {
									Text(at.description)
								}
							}
						}
						.pickerStyle(DefaultPickerStyle())
						Text("The maximum interval that can elapse without a node broadcasting a position")
							.foregroundColor(.gray)
							.font(.callout)
					}
					
					Toggle(isOn: $smartPositionEnabled) {
						Label("Smart Position", systemImage: "brain")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					
					if smartPositionEnabled {
						VStack(alignment: .leading) {
							Picker("Minimum Interval", selection: $broadcastSmartMinimumIntervalSecs) {
								ForEach(UpdateIntervals.allCases) { at in
									Text(at.description)
								}
							}
							.pickerStyle(DefaultPickerStyle())
							Text("The fastest that position updates will be sent if the minimum distance has been satisfied")
								.foregroundColor(.gray)
								.font(.callout)
						}
						VStack(alignment: .leading) {
							Picker("Minimum Distance", selection: $broadcastSmartMinimumDistance) {
								ForEach(10..<151) {
									if $0 == 0 {
										Text("unset")
									} else {
										if $0.isMultiple(of: 5) {
											Text("\($0)")
												.tag($0)
										}
									}
								}
							}
							.pickerStyle(DefaultPickerStyle())
							Text("The minimum distance change in meters to be considered for a smart position broadcast.")
								.foregroundColor(.gray)
								.font(.callout)
						}
					}
				}
				Section(header: Text("Device GPS")) {
					Picker("", selection: $gpsMode) {
						ForEach(GpsMode.allCases, id: \.self) { at in
							Text(at.description)
								.tag(at.id)
						}
					}
					.pickerStyle(SegmentedPickerStyle())
					.padding(.top, 5)
					.padding(.bottom, 5)
					
					if gpsMode == 1 {
						VStack(alignment: .leading) {
							Picker("Update Interval", selection: $gpsUpdateInterval) {
								ForEach(GpsUpdateIntervals.allCases) { ui in
									Text(ui.description)
								}
							}
							Text("How often should we try to get a GPS position.")
								.foregroundColor(.gray)
								.font(.callout)
						}
					} else {
						VStack(alignment: .leading) {
							Toggle(isOn: $fixedPosition) {
								Label("Fixed Position", systemImage: "location.square.fill")
								Text("If enabled your current phone location will be sent to the device and will broadcast over the mesh on the position interval. Fixed position will always use the most recent position the device has.")
							}
							.toggleStyle(SwitchToggleStyle(tint: .accentColor))
							
						}
						.onChange(of: fixedPosition) { newFixed in
							if node != nil && node!.positionConfig != nil {
								if newFixed != node!.positionConfig!.fixedPosition { hasChanges = true }
							}
							if supportedVersion && hasChanges && !newFixed {
								// Send Admin message to remove the fixed position
							}
						}
					}
				}
				Section(header: Text("Position Flags")) {

					Text("Optional fields to include when assembling position messages. the more fields are included, the larger the message will be - leading to longer airtime and a higher risk of packet loss")
						.foregroundColor(.gray)
						.font(.callout)

					Toggle(isOn: $includeAltitude) {
						Label("Altitude", systemImage: "arrow.up")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))

					Toggle(isOn: $includeSatsinview) {
						Label("Number of satellites", systemImage: "skew")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))

					Toggle(isOn: $includeSeqNo) { // 64
						Label("Sequence number", systemImage: "number")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))

					Toggle(isOn: $includeTimestamp) { // 128
						Label("timestamp", systemImage: "clock")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))

					Toggle(isOn: $includeHeading) { // 128
						Label("Vehicle heading", systemImage: "location.circle")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))

					Toggle(isOn: $includeSpeed) { // 128

						Label("Vehicle speed", systemImage: "speedometer")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))
				}
				Section(header: Text("Advanced Position Flags")) {
					
					if includeAltitude {
						Toggle(isOn: $includeAltitudeMsl) {
							Label("Altitude is Mean Sea Level", systemImage: "arrow.up.to.line.compact")
						}
						.toggleStyle(SwitchToggleStyle(tint: .accentColor))
						Toggle(isOn: $includeGeoidalSeparation) {
							Label("Altitude Geoidal Separation", systemImage: "globe.americas")
						}
						.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					}

					Toggle(isOn: $includeDop) {
						Text("Dilution of precision (DOP) PDOP used by default")
					}
					.toggleStyle(SwitchToggleStyle(tint: .accentColor))

					if includeDop {
						Toggle(isOn: $includeHvdop) {
							Text("If DOP is set use, HDOP / VDOP values instead of PDOP")
						}
						.toggleStyle(SwitchToggleStyle(tint: .accentColor))
					}
				}
				
				if gpsMode == 1 {
					Section(header: Text("Advanced Device GPS")) {
						Picker("GPS Receive GPIO", selection: $rxGpio) {
							ForEach(0..<49) {
								if $0 == 0 {
									Text("unset")
								} else {
									Text("Pin \($0)")
								}
							}
						}
						.pickerStyle(DefaultPickerStyle())
						Picker("GPS Transmit GPIO", selection: $txGpio) {
							ForEach(0..<49) {
								if $0 == 0 {
									Text("unset")
								} else {
									Text("Pin \($0)")
								}
							}
						}
						.pickerStyle(DefaultPickerStyle())
						Picker("GPS EN GPIO", selection: $gpsEnGpio) {
							ForEach(0..<49) {
								if $0 == 0 {
									Text("unset")
								} else {
									Text("Pin \($0)")
								}
							}
						}
						.pickerStyle(DefaultPickerStyle())
						Text("(Re)define PIN_GPS_EN for your board.")
							.font(.caption)
					}
				}
			}
			.disabled(self.bleManager.connectedPeripheral == nil || node?.positionConfig == nil)

			SaveConfigButton(node: node, hasChanges: $hasChanges) {
				if fixedPosition {
					_ = bleManager.sendPosition(channel: 0, destNum: node?.num ?? 0, wantResponse: true)
				}
				let connectedNode = getNodeInfo(id: bleManager.connectedPeripheral.num, context: context)

				if connectedNode != nil {
					var pc = Config.PositionConfig()
					pc.positionBroadcastSmartEnabled = smartPositionEnabled
					pc.gpsEnabled = gpsMode == 1
					pc.gpsMode = Config.PositionConfig.GpsMode(rawValue: gpsMode) ?? Config.PositionConfig.GpsMode.notPresent
					pc.fixedPosition = fixedPosition
					pc.gpsUpdateInterval = UInt32(gpsUpdateInterval)
					pc.positionBroadcastSecs = UInt32(positionBroadcastSeconds)
					pc.broadcastSmartMinimumIntervalSecs = UInt32(broadcastSmartMinimumIntervalSecs)
					pc.broadcastSmartMinimumDistance = UInt32(broadcastSmartMinimumDistance)
					pc.rxGpio = UInt32(rxGpio)
					pc.txGpio = UInt32(txGpio)
					pc.gpsEnGpio = UInt32(gpsEnGpio)
					var pf: PositionFlags = []
					if includeAltitude { pf.insert(.Altitude) }
					if includeAltitudeMsl { pf.insert(.AltitudeMsl) }
					if includeGeoidalSeparation { pf.insert(.GeoidalSeparation) }
					if includeDop { pf.insert(.Dop) }
					if includeHvdop { pf.insert(.Hvdop) }
					if includeSatsinview { pf.insert(.Satsinview) }
					if includeSeqNo { pf.insert(.SeqNo) }
					if includeTimestamp { pf.insert(.Timestamp) }
					if includeSpeed { pf.insert(.Speed) }
					if includeHeading { pf.insert(.Heading) }
					pc.positionFlags = UInt32(pf.rawValue)
					let adminMessageId =  bleManager.savePositionConfig(config: pc, fromUser: connectedNode!.user!, toUser: node!.user!, adminIndex: connectedNode?.myInfo?.adminIndex ?? 0)
					if adminMessageId > 0 {
						// Disable the button after a successful save
						hasChanges = false
						goBack()
					}
				}
			}
		}
		.navigationTitle("position.config")
		.navigationBarItems(trailing:

			ZStack {

			ConnectedDevice(bluetoothOn: bleManager.isSwitchedOn, deviceConnected: bleManager.connectedPeripheral != nil, name: (bleManager.connectedPeripheral != nil) ? bleManager.connectedPeripheral.shortName : "?")
		})
		.onAppear {
			if self.bleManager.context == nil {
				self.bleManager.context = context
			}
			setPositionValues()
			supportedVersion = bleManager.connectedVersion == "0.0.0" ||  self.minimumVersion.compare(bleManager.connectedVersion, options: .numeric) == .orderedAscending || minimumVersion.compare(bleManager.connectedVersion, options: .numeric) == .orderedSame

			
			// Need to request a PositionConfig from the remote node before allowing changes
			if bleManager.connectedPeripheral != nil && node?.positionConfig == nil {
				print("empty position config")
				let connectedNode = getNodeInfo(id: bleManager.connectedPeripheral.num, context: context)
				if node != nil && connectedNode != nil {
					_ = bleManager.requestPositionConfig(fromUser: connectedNode!.user!, toUser: node!.user!, adminIndex: connectedNode?.myInfo?.adminIndex ?? 0)
				}
			}
		}
		.onChange(of: deviceGpsEnabled) { newDeviceGps in
			if node != nil && node!.positionConfig != nil {
				if newDeviceGps != node!.positionConfig!.deviceGpsEnabled { hasChanges = true }
			}
		}
		.onChange(of: gpsMode) { newGpsMode in
			if node != nil && node!.positionConfig != nil {
				if newGpsMode != node!.positionConfig!.gpsMode { hasChanges = true }
			}
		}
		.onChange(of: rxGpio) { newRxGpio in
			if node != nil && node!.positionConfig != nil {
				if newRxGpio != node!.positionConfig!.rxGpio { hasChanges = true }
			}
		}
		.onChange(of: txGpio) { newTxGpio in
			if node != nil && node!.positionConfig != nil {
				if newTxGpio != node!.positionConfig!.txGpio { hasChanges = true }
			}
		}
		.onChange(of: txGpio) { newGpsEnGpio in
			if node != nil && node!.positionConfig != nil {
				if newGpsEnGpio != node!.positionConfig!.gpsEnGpio { hasChanges = true }
			}
		}
		.onChange(of: smartPositionEnabled) { newSmartPositionEnabled in
			if node != nil && node!.positionConfig != nil {
				if newSmartPositionEnabled != node!.positionConfig!.smartPositionEnabled { hasChanges = true }
			}
		}
		.onChange(of: positionBroadcastSeconds) { newPositionBroadcastSeconds in
			if node != nil && node!.positionConfig != nil {
				if newPositionBroadcastSeconds != node!.positionConfig!.positionBroadcastSeconds { hasChanges = true }
			}
		}
		.onChange(of: broadcastSmartMinimumIntervalSecs) { newBroadcastSmartMinimumIntervalSecs in
			if node != nil && node!.positionConfig != nil {
				if newBroadcastSmartMinimumIntervalSecs != node!.positionConfig!.broadcastSmartMinimumIntervalSecs { hasChanges = true }
			}
		}
		.onChange(of: broadcastSmartMinimumDistance) { newBroadcastSmartMinimumDistance in
			if node != nil && node!.positionConfig != nil {
				if newBroadcastSmartMinimumDistance != node!.positionConfig!.broadcastSmartMinimumDistance { hasChanges = true }
			}
		}
		.onChange(of: gpsUpdateInterval) { newGpsUpdateInterval in
			if node != nil && node!.positionConfig != nil {
				if newGpsUpdateInterval != node!.positionConfig!.gpsUpdateInterval { hasChanges = true }
			}
		}
		.onChange(of: includeAltitude) { altFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Altitude)
			if existingValue != altFlag { hasChanges = true }
		}
		.onChange(of: includeAltitudeMsl) { altMslFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.AltitudeMsl)
			if existingValue != altMslFlag { hasChanges = true }
		}
		.onChange(of: includeSatsinview) { satsFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Satsinview)
			if existingValue != satsFlag { hasChanges = true }
		}
		.onChange(of: includeSeqNo) { seqFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.SeqNo)
			if existingValue != seqFlag { hasChanges = true }
		}
		.onChange(of: includeTimestamp) { timestampFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Timestamp)
			if existingValue != timestampFlag { hasChanges = true }
		}
		.onChange(of: includeTimestamp) { timestampFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Timestamp)
			if existingValue != timestampFlag { hasChanges = true }
		}
		.onChange(of: includeSpeed) { speedFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Speed)
			if existingValue != speedFlag { hasChanges = true }
		}
		.onChange(of: includeHeading) { headingFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Heading)
			if existingValue != headingFlag { hasChanges = true }
		}
		.onChange(of: includeGeoidalSeparation) { geoSepFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.GeoidalSeparation)
			if existingValue != geoSepFlag { hasChanges = true }
		}
		.onChange(of: includeDop) { dopFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Dop)
			if existingValue != dopFlag { hasChanges = true }
		}
		.onChange(of: includeHvdop) { hvdopFlag in
			let pf = PositionFlags(rawValue: self.positionFlags)
			let existingValue = pf.contains(.Hvdop)
			if existingValue != hvdopFlag { hasChanges = true }
		}
	}
	func setPositionValues() {
		self.smartPositionEnabled = node?.positionConfig?.smartPositionEnabled ?? true
		self.deviceGpsEnabled = node?.positionConfig?.deviceGpsEnabled ?? false
		self.gpsMode = Int(node?.positionConfig?.gpsMode ?? 0)
		if node?.positionConfig?.deviceGpsEnabled ?? false && gpsMode != 1 {
			self.gpsMode = 1
		}
		self.rxGpio = Int(node?.positionConfig?.rxGpio ?? 0)
		self.txGpio = Int(node?.positionConfig?.txGpio ?? 0)
		self.gpsEnGpio = Int(node?.positionConfig?.gpsEnGpio ?? 0)
		self.fixedPosition = node?.positionConfig?.fixedPosition ?? false
		self.gpsUpdateInterval = Int(node?.positionConfig?.gpsUpdateInterval ?? 30)
		self.positionBroadcastSeconds = Int(node?.positionConfig?.positionBroadcastSeconds ?? 900)
		self.broadcastSmartMinimumIntervalSecs = Int(node?.positionConfig?.broadcastSmartMinimumIntervalSecs ?? 30)
		self.broadcastSmartMinimumDistance = Int(node?.positionConfig?.broadcastSmartMinimumDistance ?? 50)
		self.positionFlags = Int(node?.positionConfig?.positionFlags ?? 3)

		let pf = PositionFlags(rawValue: self.positionFlags)
		if pf.contains(.Altitude) { self.includeAltitude = true } else { self.includeAltitude = false }
		if pf.contains(.AltitudeMsl) { self.includeAltitudeMsl = true } else { self.includeAltitudeMsl = false }
		if pf.contains(.GeoidalSeparation) { self.includeGeoidalSeparation = true } else { self.includeGeoidalSeparation = false }
		if pf.contains(.Dop) { self.includeDop = true  } else { self.includeDop = false }
		if pf.contains(.Hvdop) { self.includeHvdop = true } else { self.includeHvdop = false }
		if pf.contains(.Satsinview) { self.includeSatsinview = true } else { self.includeSatsinview = false }
		if pf.contains(.SeqNo) { self.includeSeqNo = true } else { self.includeSeqNo = false }
		if pf.contains(.Timestamp) { self.includeTimestamp = true } else { self.includeTimestamp = false }
		if pf.contains(.Speed) { self.includeSpeed = true } else { self.includeSpeed = false }
		if pf.contains(.Heading) { self.includeHeading = true } else { self.includeHeading = false }

		self.hasChanges = false
	}
}