import AppKit
import ApplicationLibrary
import Foundation
import Library
import SwiftUI

@MainActor
public struct MainView: View {
    @Environment(\.controlActiveState) private var controlActiveState
    @EnvironmentObject private var environments: ExtensionEnvironments
    @StateObject private var viewModel: MainViewModel
    @State private var showCardManagement = false
    @State private var cardConfigurationVersion = 0
    @State private var settingsNavigationPath = NavigationPath()
    @State private var pendingSettingsPage: SettingsPage?
    @State private var didConfigureScreenshotWindow = false
    @State private var pendingScreenshotSelection: NavigationPage?

    private let profileEditor: (Binding<String>, Bool) -> AnyView = { text, isEditable in
        AnyView(ProfileEditorWrapperView(text: text, isEditable: isEditable))
    }

    private let screenshotDefaultPixelHeight: CGFloat = 1000

    public init() {
        let initialSelection: NavigationPage = .dashboard
        if Variant.screenshotMode,
           let pageValue = ProcessInfo.processInfo.environment["SCREENSHOT_PAGE"],
           let page = NavigationPage(snapshotValue: pageValue)
        {
            _pendingScreenshotSelection = State(initialValue: page)
        } else {
            _pendingScreenshotSelection = State(initialValue: nil)
        }
        _viewModel = StateObject(wrappedValue: MainViewModel(selection: initialSelection))
    }

    private func screenshotTargetHeight(baseHeight _: CGFloat, window: NSWindow) -> CGFloat {
        let scale = max(window.backingScaleFactor, 1)
        if let pixelOverride = ProcessInfo.processInfo.environment["SCREENSHOT_WINDOW_PIXEL_HEIGHT"] {
            let trimmed = pixelOverride.trimmingCharacters(in: .whitespacesAndNewlines)
            if let height = Double(trimmed), height > 0 {
                return CGFloat(height) / scale
            }
        }
        if let override = ProcessInfo.processInfo.environment["SCREENSHOT_WINDOW_HEIGHT"] {
            let trimmed = override.trimmingCharacters(in: .whitespacesAndNewlines)
            if let height = Double(trimmed), height > 0 {
                return CGFloat(height)
            }
        }
        return screenshotDefaultPixelHeight / scale
    }

    public var body: some View {
        NavigationSplitView {
            SidebarView(selection: $viewModel.selection)
                .navigationSplitViewColumnWidth(150)
        } detail: {
            NavigationStack(path: $settingsNavigationPath) {
                viewModel.selection.contentView
                    .navigationTitle(viewModel.selection.title)
            }
            .environment(\.cardConfigurationVersion, cardConfigurationVersion)
            .environment(\.settingsNavigationPath, $settingsNavigationPath)
            .navigationSplitViewColumnWidth(650)
        }
        .frame(minHeight: Variant.screenshotMode ? 0 : 500)
        .background(WindowAccessor { window in
            guard Variant.screenshotMode, !didConfigureScreenshotWindow, let window else { return }
            didConfigureScreenshotWindow = true
            DispatchQueue.main.async {
                window.hasShadow = true
                let baseSize = window.contentLayoutRect.size
                let targetHeight = screenshotTargetHeight(baseHeight: baseSize.height, window: window)
                let targetSize = NSSize(width: baseSize.width, height: targetHeight)
                guard targetSize.width > 0, targetSize.height > 0 else { return }
                window.contentMinSize = targetSize
                window.contentMaxSize = targetSize
                window.minSize = targetSize
                window.maxSize = targetSize
                window.setContentSize(targetSize)
                if let pending = pendingScreenshotSelection, pending != viewModel.selection {
                    viewModel.selection = pending
                    pendingScreenshotSelection = nil
                }
            }
        })
        .onAppear {
            viewModel.onAppear(environments: environments)
        }
        .alert($viewModel.alert)
        .globalChecks()
        .toolbar {
            ToolbarItem(placement: .navigation) {
                StartStopButton()
            }
            if viewModel.selection == .dashboard {
                ToolbarItem(placement: .automatic) {
                    Menu {
                        Button {
                            showCardManagement = true
                        } label: {
                            Label("Dashboard Items", systemImage: "square.grid.2x2")
                        }
                    } label: {
                        Label("Others", systemImage: "line.3.horizontal.circle")
                    }
                    .menuIndicator(.hidden)
                }
            }
        }
        .onChangeCompat(of: controlActiveState) { newValue in
            Task { @MainActor in
                viewModel.onControlActiveStateChange(newValue, environments: environments)
            }
        }
        .onChangeCompat(of: viewModel.selection) { value in
            Task { @MainActor in
                viewModel.onSelectionChange(value, environments: environments)
                if value != .settings {
                    settingsNavigationPath = NavigationPath()
                    pendingSettingsPage = nil
                    return
                }
                if let page = pendingSettingsPage {
                    settingsNavigationPath = NavigationPath()
                    settingsNavigationPath.append(page)
                    pendingSettingsPage = nil
                }
            }
        }
        .onReceive(environments.openSettings) {
            Task { @MainActor in viewModel.openSettings() }
        }
        .onReceive(NotificationCenter.default.publisher(for: .navigateToSettingsPage)) { notification in
            guard let page = notification.object as? SettingsPage else { return }
            Task { @MainActor in
                pendingSettingsPage = page
                if viewModel.selection == .settings {
                    settingsNavigationPath = NavigationPath()
                    settingsNavigationPath.append(page)
                    pendingSettingsPage = nil
                } else {
                    viewModel.selection = .settings
                }
            }
        }
        .environment(\.selection, $viewModel.selection)
        .environment(\.importProfile, $viewModel.importProfile)
        .environment(\.importRemoteProfile, $viewModel.importRemoteProfile)
        .environment(\.profileEditor, profileEditor)
        .handlesExternalEvents(preferring: [], allowing: ["*"])
        .onOpenURL(perform: viewModel.openURL)
        .sheet(isPresented: $showCardManagement, onDismiss: {
            cardConfigurationVersion += 1
        }, content: {
            CardManagementSheet()
                .frame(minWidth: 400, minHeight: 400)
        })
    }
}