//
//  UserMessageList.swift
//  MeshtasticApple
//
//  Created by Garth Vander Houwen on 12/24/21.
//

import SwiftUI
import CoreData
import OSLog

struct ChannelMessageList: View {
	@StateObject var appState = AppState.shared
	@Environment(\.managedObjectContext) var context
	@EnvironmentObject var bleManager: BLEManager

	// Keyboard State
	@FocusState var messageFieldFocused: Bool

	@ObservedObject var myInfo: MyInfoEntity
	@ObservedObject var channel: ChannelEntity
	@State private var replyMessageId: Int64 = 0
	@AppStorage("preferredPeripheralNum") private var preferredPeripheralNum = -1

	var body: some View {
		VStack {
			ScrollViewReader { scrollView in
				ScrollView {
					LazyVStack {
						ForEach( channel.allPrivateMessages ) { (message: MessageEntity) in
							let currentUser: Bool = (Int64(preferredPeripheralNum) == message.fromUser?.num ? true : false)
							if message.replyID > 0 {
								let messageReply = channel.allPrivateMessages.first(where: { $0.messageId == message.replyID })
								HStack {
									Text(messageReply?.messagePayload ?? "EMPTY MESSAGE").foregroundColor(.accentColor).font(.caption2)
										.padding(10)
										.overlay(
											RoundedRectangle(cornerRadius: 18)
												.stroke(Color.blue, lineWidth: 0.5)
										)
									Image(systemName: "arrowshape.turn.up.left.fill")
										.symbolRenderingMode(.hierarchical)
										.imageScale(.large).foregroundColor(.accentColor)
										.padding(.trailing)
								}
							}
							HStack(alignment: .bottom) {
								if currentUser { Spacer(minLength: 50) }
								if !currentUser {
									CircleText(text: message.fromUser?.shortName ?? "?", color: Color(UIColor(hex: UInt32(message.fromUser?.num ?? 0))), circleSize: 44)
										.padding(.all, 5)
										.offset(y: -7)
								}

								VStack(alignment: currentUser ? .trailing : .leading) {
									let isDetectionSensorMessage = message.portNum == Int32(PortNum.detectionSensorApp.rawValue)

									if !currentUser && message.fromUser != nil {
										Text("\(message.fromUser?.longName ?? "unknown".localized ) (\(message.fromUser?.userId ?? "?"))")
											.font(.caption)
											.foregroundColor(.gray)
											.offset(y: 8)
									}

									HStack {
										MessageText(
											message: message,
											tapBackDestination: .channel(channel),
											isCurrentUser: currentUser
										) {
											self.replyMessageId = message.messageId
											self.messageFieldFocused = true
										}

										if currentUser && message.canRetry {
											RetryButton(message: message, destination: .channel(channel))
										}
									}

									TapbackResponses(message: message) {
										appState.unreadChannelMessages = myInfo.unreadMessages
										UIApplication.shared.applicationIconBadgeNumber = appState.unreadChannelMessages + appState.unreadDirectMessages
										context.refresh(myInfo, mergeChanges: true)
									}

									HStack {
										if currentUser && message.receivedACK {
											// Ack Received
											Text("Acknowledged").font(.caption2).foregroundColor(.gray)
										} else if currentUser && message.ackError == 0 {
											// Empty Error
											Text("Waiting to be acknowledged. . .").font(.caption2).foregroundColor(.orange)
										} else if currentUser && message.ackError > 0 {
											let ackErrorVal = RoutingError(rawValue: Int(message.ackError))
											Text("\(ackErrorVal?.display ?? "Empty Ack Error")").fixedSize(horizontal: false, vertical: true)
												.font(.caption2).foregroundColor(.red)
										} else if isDetectionSensorMessage {
											let messageDate = message.timestamp
											Text(" \(messageDate.formattedDate(format: MessageText.dateFormatString))").font(.caption2).foregroundColor(.gray)
										}
									}
								}
								.padding(.bottom)
								.id(channel.allPrivateMessages.firstIndex(of: message))

								if !currentUser {
									Spacer(minLength: 50)
								}
							}
							.padding([.leading, .trailing])
							.frame(maxWidth: .infinity)
							.id(message.messageId)
							.onAppear {
								if !message.read {
									message.read = true
									do {
										try context.save()
										Logger.data.info("📖 Read message \(message.messageId) ")
										appState.unreadChannelMessages = myInfo.unreadMessages
										UIApplication.shared.applicationIconBadgeNumber = appState.unreadChannelMessages + appState.unreadDirectMessages
										context.refresh(myInfo, mergeChanges: true)
									} catch {
										Logger.data.error("Failed to read message \(message.messageId): \(error.localizedDescription)")
									}
								}
							}
						}
					}
				}
				.padding([.top])
				.scrollDismissesKeyboard(.immediately)
				.onAppear {
					if self.bleManager.context == nil {
						self.bleManager.context = context
					}
					if channel.allPrivateMessages.count > 0 {
						scrollView.scrollTo(channel.allPrivateMessages.last!.messageId)
					}
				}
				.onChange(of: channel.allPrivateMessages, perform: { _ in
					if channel.allPrivateMessages.count > 0 {
						scrollView.scrollTo(channel.allPrivateMessages.last!.messageId)
					}
				})
			}

			TextMessageField(
				destination: .channel(channel),
				replyMessageId: $replyMessageId,
				isFocused: $messageFieldFocused
			) {
				context.refresh(channel, mergeChanges: true)
			}
		}
		.navigationBarTitleDisplayMode(.inline)
		.toolbar {
			ToolbarItem(placement: .principal) {
				HStack {
					CircleText(text: String(channel.index), color: .accentColor, circleSize: 44).fixedSize()
					Text(String(channel.name ?? "unknown".localized).camelCaseToWords()).font(.headline)
				}
			}
			ToolbarItem(placement: .navigationBarTrailing) {
				ZStack {
					ConnectedDevice(
						bluetoothOn: bleManager.isSwitchedOn,
						deviceConnected: bleManager.connectedPeripheral != nil,
						name: (bleManager.connectedPeripheral != nil) ? bleManager.connectedPeripheral.shortName : "?",

						// mqttProxyConnected defaults to false, so if it's not enabled it will still be false
						mqttProxyConnected: bleManager.mqttProxyConnected && (channel.uplinkEnabled || channel.downlinkEnabled),
						mqttUplinkEnabled: channel.uplinkEnabled,
						mqttDownlinkEnabled: channel.downlinkEnabled,
						mqttTopic: bleManager.mqttManager.topic
					)
				}
			}
		}
	}
}