import Foundation
import Libbox
import Library
import SwiftUI

@MainActor
public struct ActiveDashboardView: View {
    @Environment(\.scenePhase) private var scenePhase
    @EnvironmentObject private var environments: ExtensionEnvironments
    @EnvironmentObject private var profile: ExtensionProfile
    @StateObject private var coordinator = DashboardCoordinator()
    @State private var cardConfigurationVersion = 0
    #if os(iOS) || os(tvOS)
        @State private var showCardManagement = false
        @State private var showGroups = false
        @State private var showConnections = false
        @State private var buttonState = ButtonVisibilityState()
    #endif

    private let externalCardConfigurationVersion: Int?

    public init(externalCardConfigurationVersion: Int? = nil) {
        self.externalCardConfigurationVersion = externalCardConfigurationVersion
    }

    public var body: some View {
        if coordinator.isLoading {
            ProgressView()
                .onAppear {
                    coordinator.onEmptyProfilesChange = { environments.emptyProfiles = $0 }
                    Task { await coordinator.reload() }
                }
        } else {
            content
                .onAppear {
                    guard !ApplicationLibrary.inPreview else { return }
                    Task { await coordinator.reloadSystemProxy() }
                }
                .onChangeCompat(of: profile.status) { status in
                    guard !ApplicationLibrary.inPreview, status == .connected else { return }
                    Task { await coordinator.reloadSystemProxy() }
                }
        }
    }

    @ViewBuilder
    private var content: some View {
        overviewPage
        #if os(iOS) || os(tvOS)
        .toolbar { toolbar }
        .sheet(isPresented: $showGroups) {
            groupsSheetContent
        }
        .sheet(isPresented: $showConnections) {
            connectionsSheetContent
        }
        #endif
        .onAppear {
            if ApplicationLibrary.inPreview {
                environments.commandClient.connect()
            } else {
                environments.connect()
            }
        }
        .onChangeCompat(of: scenePhase) { phase in
            guard phase == .active else { return }
            environments.connect()
        }
        .onChangeCompat(of: profile.status) { status in
            guard status.isConnected else { return }
            environments.connect()
        }
        .onReceive(environments.profileUpdate) { _ in
            Task { await coordinator.reload() }
        }
        .onReceive(environments.selectedProfileUpdate) { _ in
            Task {
                await coordinator.updateSelectedProfile()
                if profile.status.isConnected {
                    await coordinator.reloadSystemProxy()
                }
            }
        }
        #if os(iOS) || os(tvOS)
        .onReceive(environments.commandClient.$groups) { _ in
            updateButtonVisibility()
        }
        .onReceive(environments.commandClient.$connections) { _ in
            updateButtonVisibility()
        }
        .onReceive(profile.$status) { _ in
            updateButtonVisibility()
        }
        .onAppear {
            updateButtonVisibility()
        }
        #endif
        .alertBinding($coordinator.alert)
    }

    @ViewBuilder
    private var overviewPage: some View {
        OverviewView(
            $coordinator.profileList,
            $coordinator.selectedProfileID,
            $coordinator.systemProxyAvailable,
            $coordinator.systemProxyEnabled,
            cardConfigurationVersion: externalCardConfigurationVersion ?? cardConfigurationVersion
        )
    }

    #if os(iOS) || os(tvOS)
        private func updateButtonVisibility() {
            buttonState.update(profile: profile, commandClient: environments.commandClient)
        }

        @ToolbarContentBuilder
        private var toolbar: some ToolbarContent {
            ToolbarItem(placement: .topBarLeading) {
                #if os(iOS)
                    if #available(iOS 26.0, *), !Variant.debugNoIOS26 {
                        EmptyView()
                    } else {
                        navigationButtons
                    }
                #else
                    navigationButtons
                #endif
            }
            ToolbarItem(placement: .topBarTrailing) {
                if #available(iOS 16.0, tvOS 17.0, *) {
                    cardManagementButton
                }
            }
            ToolbarItem(placement: .topBarTrailing) {
                #if os(iOS)
                    if #available(iOS 26.0, *), !Variant.debugNoIOS26 {
                        EmptyView()
                    } else {
                        HStack(spacing: 12) {
                            Divider()
                            StartStopButton()
                        }
                    }
                #else
                    HStack(spacing: 12) {
                        Divider()
                        StartStopButton()
                    }
                #endif
            }
        }

        private var navigationButtons: some View {
            NavigationButtonsView(
                showGroupsButton: buttonState.showGroupsButton,
                showConnectionsButton: buttonState.showConnectionsButton,
                groupsCount: buttonState.groupsCount,
                connectionsCount: buttonState.connectionsCount,
                onGroupsTap: { showGroups = true },
                onConnectionsTap: { showConnections = true }
            )
        }
    #endif

    #if os(iOS) || os(tvOS)
        private var groupsSheetContent: some View {
            GroupsSheetContent()
        }

        private var connectionsSheetContent: some View {
            ConnectionsSheetContent()
        }

        @available(iOS 16.0, tvOS 17.0, *)
        @ViewBuilder
        private var cardManagementButton: some View {
            Menu {
                Button {
                    showCardManagement = true
                } label: {
                    Label("Dashboard Items", systemImage: "square.grid.2x2")
                }
            } label: {
                Label("Others", systemImage: "ellipsis.circle")
            }
            .sheet(isPresented: $showCardManagement) {
                CardManagementSheet(configurationVersion: $cardConfigurationVersion)
                    .presentationDetents([.large])
                    .presentationDragIndicator(.visible)
            }
        }
    #endif
}