Meshtastic-Apple/Meshtastic/Views/Messages/ChannelList.swift

//
//  ChannelList.swift
//  Meshtastic
//
//  Copyright(c) Garth Vander Houwen 8/29/23.
//

import SwiftUI
import CoreData

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

	@State var node: NodeInfoEntity?

	@State private var channelSelection: ChannelEntity? // Nothing selected by default.
	@State private var isPresentingDeleteChannelMessagesConfirm: Bool = false

	@State private var isPresentingTraceRouteSentAlert = false
	
	var body: some View {
		let localeDateFormat = DateFormatter.dateFormat(fromTemplate: "yyMMdd", options: 0, locale: Locale.current)
		let dateFormatString = (localeDateFormat ?? "MM/dd/YY")
		
		VStack {
			// Display Contacts for the rest of the non admin channels
			if node != nil && node!.myInfo != nil && node!.myInfo!.channels != nil {
				List(node!.myInfo!.channels!.array as! [ChannelEntity], id: \.self, selection: $channelSelection) { (channel: ChannelEntity) in
					if channel.name?.lowercased() ?? "" != "admin" && channel.name?.lowercased() ?? "" != "gpio" && channel.name?.lowercased() ?? "" != "serial" {

						NavigationLink(destination: ChannelMessageList(myInfo: node!.myInfo!, channel: channel)) {

							let mostRecent = channel.allPrivateMessages.last(where: { $0.channel == channel.index })
							let lastMessageTime = Date(timeIntervalSince1970: TimeInterval(Int64((mostRecent?.messageTimestamp ?? 0 ))))
							let lastMessageDay = Calendar.current.dateComponents([.day], from: lastMessageTime).day ?? 0
							let currentDay = Calendar.current.dateComponents([.day], from: Date()).day ?? 0

							ZStack {
								Image(systemName: "circle.fill")
									.opacity(channel.unreadMessages > 0 ? 1 : 0)
									.font(.system(size: 10))
									.foregroundColor(.accentColor)
									.brightness(0.2)
							}
							CircleText(text: String(channel.index), color: .accentColor)
								.brightness(0.2)
							
							VStack(alignment: .leading){
								HStack{
									if channel.name?.isEmpty ?? false {
										if channel.role == 1 {
											Text(String("PrimaryChannel").camelCaseToWords())
												.font(.headline)
										} else {
											Text(String("Channel \(channel.index)").camelCaseToWords())
												.font(.headline)
										}
									} else {
										Text(String(channel.name ?? "Channel \(channel.index)").camelCaseToWords())
											.font(.headline)
									}
									
									Spacer()
									
									if channel.allPrivateMessages.count > 0 {

										if lastMessageDay == currentDay {
											Text(lastMessageTime, style: .time )
												.font(.footnote)
												.foregroundColor(.secondary)
										} else if  lastMessageDay == (currentDay - 1) {
											Text("Yesterday")
												.font(.footnote)
												.foregroundColor(.secondary)
										} else if  lastMessageDay < (currentDay - 1) && lastMessageDay > (currentDay - 5) {
											Text(lastMessageTime.formattedDate(format: dateFormatString))
												.font(.footnote)
												.foregroundColor(.secondary)
										} else if lastMessageDay < (currentDay - 1800) {
											Text(lastMessageTime.formattedDate(format: dateFormatString))
												.font(.footnote)
												.foregroundColor(.secondary)
										}
									}
//										Image(systemName: "chevron.forward")
//											.font(.caption)
//											.foregroundColor(.secondary)
								}
								
								if channel.allPrivateMessages.count > 0 {
									HStack(alignment: .top) {
										Text("\(mostRecent != nil ? mostRecent!.messagePayload! : " ")")
											//.font(.system(size: 16))
											.font(.footnote)
											.foregroundColor(.secondary)
									}
								}
							}
						}
						.frame(height: 62)
						.contextMenu {
							if channel.allPrivateMessages.count > 0 {
								Button(role: .destructive) {
									isPresentingDeleteChannelMessagesConfirm = true
									channelSelection = channel
								} label: {
									Label("Delete Messages", systemImage: "trash")
								}
							}
						}
						.confirmationDialog(
							"This conversation will be deleted.",
							isPresented: $isPresentingDeleteChannelMessagesConfirm,
							titleVisibility: .visible
						) {
							Button(role: .destructive) {
								deleteChannelMessages(channel: channelSelection!, context: context)
								context.refresh(node!.myInfo!, mergeChanges: true)
								UIApplication.shared.applicationIconBadgeNumber = appState.unreadChannelMessages + appState.unreadDirectMessages
								channelSelection = nil
							} label: {
								Text("delete")
							}
						}
						.onAppear {
							if self.bleManager.context == nil {
								self.bleManager.context = context
							}
						}
					}
				}
				.padding([.top, .bottom])
				.listStyle(.plain)
			}
		}
		.navigationTitle("channels")
	}
}