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

import SwiftUI
import CoreData
#if canImport(TipKit)
import TipKit
#endif

struct UserList: View {
	
	@StateObject var appState = AppState.shared
	@Environment(\.managedObjectContext) var context
	@EnvironmentObject var bleManager: BLEManager
	@State private var searchText = ""
	var usersQuery: Binding<String> {
		 Binding {
			 searchText
		 } set: { newValue in
			 searchText = newValue
			 users.nsPredicate = newValue.isEmpty ? nil : NSPredicate(format: "longName CONTAINS[c] %@ OR shortName CONTAINS[c] %@", newValue, newValue)
		 }
	}
	@FetchRequest(
		sortDescriptors: [NSSortDescriptor(key: "lastMessage", ascending: false), NSSortDescriptor(key: "vip", ascending: false), NSSortDescriptor(key: "longName", ascending: true)],
		animation: .default)

	private var users: FetchedResults<UserEntity>
	@State var node: NodeInfoEntity?
	@State private var userSelection: UserEntity? // Nothing selected by default.
	@State private var isPresentingDeleteUserMessagesConfirm: Bool = false
	
	var body: some View {
		let localeDateFormat = DateFormatter.dateFormat(fromTemplate: "yyMMdd", options: 0, locale: Locale.current)
		let dateFormatString = (localeDateFormat ?? "MM/dd/YY")
		VStack {
			List {
				if #available(iOS 17.0, macOS 14.0, *) {
					TipView(ContactsTip(), arrowEdge: .bottom)
				}
				ForEach(users) { (user: UserEntity) in
					let mostRecent = user.messageList.last
					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
					if  user.num != bleManager.connectedPeripheral?.num ?? 0 {
					NavigationLink(destination: UserMessageList(user: user)) {
						ZStack {
							Image(systemName: "circle.fill")
								.opacity(user.unreadMessages > 0 ? 1 : 0)
								.font(.system(size: 10))
								.foregroundColor(.accentColor)
								.brightness(0.2)
						}
						
						CircleText(text: user.shortName ?? "?", color: Color(UIColor(hex: UInt32(user.num))))
						
						VStack(alignment: .leading){
							HStack{
								Text(user.longName ?? "unknown".localized)
									.font(.headline)
								Spacer()
								if user.vip {
									Image(systemName: "star.fill")
										.foregroundColor(.yellow)
								}
								if user.messageList.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 user.messageList.count > 0 {
								HStack(alignment: .top) {
									Text("\(mostRecent != nil ? mostRecent!.messagePayload! : " ")")
										.font(.footnote)
										.foregroundColor(.secondary)
								}
							}
						}
					}
					.frame(height: 62)
					.contextMenu {
						Button {
							user.vip = !user.vip
							do {
								try context.save()
							} catch {
								context.rollback()
								print("💥 Save User VIP Error")
							}
						} label: {
							Label(user.vip ? "Un-Favorite" : "Favorite", systemImage: user.vip ? "star.slash.fill" : "star.fill")
						}
						Button {
							user.mute = !user.mute
							do {
								try context.save()
							} catch {
								context.rollback()
								print("💥 Save User Mute Error")
							}
						} label: {
							Label(user.mute ? "Show Alerts" : "Hide Alerts", systemImage: user.mute ? "bell" : "bell.slash")
						}
						if user.messageList.count  > 0 {
							Button(role: .destructive) {
								isPresentingDeleteUserMessagesConfirm = true
								userSelection = user
							} label: {
								Label("Delete Messages", systemImage: "trash")
							}
						}
					}
					.confirmationDialog(
						"This conversation will be deleted.",
						isPresented: $isPresentingDeleteUserMessagesConfirm,
						titleVisibility: .visible
					) {
							Button(role: .destructive) {
								deleteUserMessages(user: userSelection!, context: context)
								context.refresh(node!.user!, mergeChanges: true)
								UIApplication.shared.applicationIconBadgeNumber = appState.unreadChannelMessages + appState.unreadDirectMessages
							} label: {
								Text("delete")
							}
						}
					}
				}
			}
			.listStyle(.plain)
			.navigationTitle(String.localizedStringWithFormat("contacts %@".localized, String(users.count == 0 ? 0 : users.count - 1)))
			.searchable(text: usersQuery, prompt: "Find a contact")
		}
	}
}