import MeshtasticProtobufs
import OSLog
import SwiftUI
import DatadogSessionReplay

struct MessageText: View {
	static let linkBlue = Color(red: 0.4627, green: 0.8392, blue: 1) /* #76d6ff */
	static let localeDateFormat = DateFormatter.dateFormat(
		fromTemplate: "yyMMddjmmssa",
		options: 0,
		locale: Locale.current
	)
	static let localeTimeFormat = DateFormatter.dateFormat(
		fromTemplate: "jmmssa",
		options: 0,
		locale: Locale.current
	)
	static let dateFormatString = (localeDateFormat ?? "MM/dd/YY j:mm:ss:a")
	static let timeFormatString = (localeTimeFormat ?? "j:mm:ss:a")
	@Environment(\.managedObjectContext) var context
	@EnvironmentObject var accessoryManager: AccessoryManager
	
	let message: MessageEntity
	let tapBackDestination: MessageDestination
	let isCurrentUser: Bool
	let onReply: () -> Void
	// State for handling channel URL sheet
	@State private var saveChannelLink: SaveChannelLinkData?
	@State private var isShowingDeleteConfirmation = false
	
	@FocusState private var isTapbackInputFocused: Bool
	@State private var tapbackText = ""
	
	var body: some View {
		SessionReplayPrivacyView(textAndInputPrivacy: .maskAll) {
			messageContent
				.environment(\.openURL, OpenURLAction { url in
					handleURL(url)
				})
				.sheet(item: $saveChannelLink) { link in
					SaveChannelQRCode(
						channelSetLink: link.data,
						addChannels: link.add,
						accessoryManager: accessoryManager
					)
					.presentationDetents([.large])
					.presentationDragIndicator(.visible)
				}
				.confirmationDialog(
					"Are you sure you want to delete this message?",
					isPresented: $isShowingDeleteConfirmation,
					titleVisibility: .visible
				) {
					Button("Delete Message", role: .destructive) {
						deleteMessage()
					}
					Button("Cancel", role: .cancel) {}
				}
		}
	}
	
	private var messageContent: some View {
		let markdownText = LocalizedStringKey(message.messagePayloadMarkdown ?? (message.messagePayload ?? "EMPTY MESSAGE"))
		return Text(markdownText)
			.tint(Self.linkBlue)
			.padding(.vertical, 10)
			.padding(.horizontal, 8)
			.foregroundColor(.white)
			.background(isCurrentUser ? .accentColor : Color(.gray))
			.cornerRadius(15)
			.background {
				TextField("", text: $tapbackText)
					.keyboardType(.emoji)
					.scrollDismissesKeyboard(.immediately)
					.focused($isTapbackInputFocused)
					.frame(width: 0, height: 0)
					.opacity(0)
					.onChange(of: tapbackText) {
						processTapback()
					}
			}
			.overlay(messageOverlays)
			.contextMenu {
				MessageContextMenuItems(
					message: message,
					tapBackDestination: tapBackDestination,
					isCurrentUser: isCurrentUser,
					isShowingDeleteConfirmation: $isShowingDeleteConfirmation,
					isShowingTapbackInput: Binding(
						get: { isTapbackInputFocused },
						set: { isTapbackInputFocused = $0 }
					),
					onReply: onReply
				)
			}
	}
	
	@ViewBuilder
	private var messageOverlays: some View {
		if message.pkiEncrypted && message.realACK || !isCurrentUser && message.pkiEncrypted {
			VStack(alignment: .trailing) {
				Spacer()
				HStack {
					Spacer()
					Image(systemName: "lock.circle.fill")
						.symbolRenderingMode(.palette)
						.foregroundStyle(.white, .green)
						.font(.system(size: 20))
						.offset(x: 8, y: 8)
				}
			}
		}
		if message.portNum == Int32(PortNum.storeForwardApp.rawValue) {
			VStack(alignment: .trailing) {
				Spacer()
				HStack {
					Spacer()
					Image(systemName: "envelope.circle.fill")
						.symbolRenderingMode(.palette)
						.foregroundStyle(.white, .gray)
						.font(.system(size: 20))
						.offset(x: 8, y: 8)
				}
			}
		}
		if tapBackDestination.overlaySensorMessage && message.portNum == Int32(PortNum.detectionSensorApp.rawValue) {
			Image(systemName: "sensor.fill")
				.padding()
				.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topTrailing)
				.foregroundStyle(Color.orange)
				.symbolRenderingMode(.multicolor)
				.symbolEffect(.variableColor.reversing.cumulative, options: .repeat(20).speed(3))
				.offset(x: 20, y: -20)
		}
	}
	
	private func handleURL(_ url: URL) -> OpenURLAction.Result {
		saveChannelLink = nil
		var addChannels = false
		if url.absoluteString.lowercased().contains("meshtastic.org/v/#") {
			// Handle contact URL
			ContactURLHandler.handleContactUrl(url: url, accessoryManager: AccessoryManager.shared)
			return .handled // Prevent default browser opening
		} else if url.absoluteString.lowercased().contains("meshtastic.org/e/") {
			// Handle channel URL
			let components = url.absoluteString.components(separatedBy: "#")
			guard !components.isEmpty, let lastComponent = components.last else {
				Logger.services.error("No valid components found in channel URL: \(url.absoluteString, privacy: .public)")
				return .discarded
			}
			addChannels = Bool(url.query?.contains("add=true") ?? false)
			guard let lastComponent = components.last else {
				Logger.services.error("Channel URL missing fragment component: \(url.absoluteString, privacy: .public)")
				self.saveChannelLink = nil
				return .discarded
			}
			let cs = lastComponent.components(separatedBy: "?").first ?? ""
			self.saveChannelLink = SaveChannelLinkData(data: cs, add: addChannels)
			Logger.services.debug("Add Channel: \(addChannels, privacy: .public)")
			Logger.mesh.debug("Opening Channel Settings URL: \(url.absoluteString, privacy: .public)")
			return .handled // Prevent default browser opening
		}
		return .systemAction // Open other URLs in browser
	}
	
	private func deleteMessage() {
		context.delete(message)
		do {
			try context.save()
		} catch {
			Logger.data.error("Failed to delete message \(message.messageId, privacy: .public): \(error.localizedDescription, privacy: .public)")
		}
	}
	
	private func processTapback() {
		guard !tapbackText.isEmpty else { return }
		let emojiToSend = tapbackText
		
		Task {
			do {
				try await accessoryManager.sendMessage(
					message: emojiToSend,
					toUserNum: tapBackDestination.userNum,
					channel: tapBackDestination.channelNum,
					isEmoji: true,
					replyID: message.messageId
				)
				await MainActor.run {
					switch tapBackDestination {
					case let .channel(channel):
						context.refresh(channel, mergeChanges: true)
					case let .user(user):
						context.refresh(user, mergeChanges: true)
					}
				}
			} catch {
				Logger.services.warning("Failed to send tapback.")
			}
		}
		
		tapbackText = ""
		isTapbackInputFocused = false
	}
}

private extension MessageDestination {
	var overlaySensorMessage: Bool {
		switch self {
		case .user: return false
		case .channel: return true
		}
	}
}