//
//  DynamicIslandViewCoordinator.swift
//  DynamicIsland
//
//  Created by Alexander on 2024-11-20.
//

import Combine
import Defaults
import SwiftUI

enum SneakContentType {
    case brightness
    case volume
    case backlight
    case music
    case mic
    case battery
    case download
    case timer
    case reminder
    case recording
    case doNotDisturb
    case bluetoothAudio
    case privacy
    case lockScreen
    case capsLock
}

struct sneakPeek {
    var show: Bool = false
    var type: SneakContentType = .music
    var value: CGFloat = 0
    var icon: String = ""
}

enum BrowserType {
    case chromium
    case safari
}

struct ExpandedItem {
    var show: Bool = false
    var type: SneakContentType = .battery
    var value: CGFloat = 0
    var browser: BrowserType = .chromium
}

class DynamicIslandViewCoordinator: ObservableObject {
    static let shared = DynamicIslandViewCoordinator()
    private var cancellables = Set<AnyCancellable>()
    
    @Published var currentView: NotchViews = .home {
        didSet {
            if Defaults[.enableMinimalisticUI] && currentView != .home {
                currentView = .home
                return
            }
            handleStatsTabTransition(from: oldValue, to: currentView)
        }
    }
    
    @Published var statsSecondRowExpansion: CGFloat = 1
    private var statsSecondRowWorkItem: DispatchWorkItem?
    private let statsSecondRowRevealDelay: TimeInterval = 0.5
    private let statsSecondRowAnimationDuration: TimeInterval = 0.3
    @Published var notesLayoutState: NotesLayoutState = .list
    
    
    @AppStorage("firstLaunch") var firstLaunch: Bool = true
    @AppStorage("showWhatsNew") var showWhatsNew: Bool = true
    @AppStorage("musicLiveActivityEnabled") var musicLiveActivityEnabled: Bool = true
    @AppStorage("timerLiveActivityEnabled") var timerLiveActivityEnabled: Bool = true

    @Default(.enableTimerFeature) private var enableTimerFeature
    @Default(.timerDisplayMode) private var timerDisplayMode
    
    @AppStorage("alwaysShowTabs") var alwaysShowTabs: Bool = true {
        didSet {
            if !alwaysShowTabs {
                openLastTabByDefault = false
                if TrayDrop.shared.isEmpty || !Defaults[.openShelfByDefault] {
                    currentView = .home
                }
            }
        }
    }
    
    @AppStorage("openLastTabByDefault") var openLastTabByDefault: Bool = false {
        didSet {
            if openLastTabByDefault {
                alwaysShowTabs = true
            }
        }
    }
    
    @AppStorage("hudReplacement") var hudReplacement: Bool = true
    
    @AppStorage("preferred_screen_name") var preferredScreen = NSScreen.main?.localizedName ?? "Unknown" {
        didSet {
            selectedScreen = preferredScreen
            NotificationCenter.default.post(name: Notification.Name.selectedScreenChanged, object: nil)
        }
    }
    
    @Published var selectedScreen: String = NSScreen.main?.localizedName ?? "Unknown"

    @Published var optionKeyPressed: Bool = true
    
    private init() {
        selectedScreen = preferredScreen
        Defaults.publisher(.timerDisplayMode)
            .receive(on: DispatchQueue.main)
            .sink { [weak self] change in
                self?.handleTimerDisplayModeChange(change.newValue)
            }
            .store(in: &cancellables)

        Defaults.publisher(.enableTimerFeature)
            .receive(on: DispatchQueue.main)
            .sink { [weak self] change in
                self?.handleTimerFeatureToggle(change.newValue)
            }
            .store(in: &cancellables)

        Defaults.publisher(.enableMinimalisticUI)
            .receive(on: DispatchQueue.main)
            .sink { [weak self] change in
                self?.handleMinimalisticModeChange(change.newValue)
            }
            .store(in: &cancellables)
    }

    private func handleStatsTabTransition(from oldValue: NotchViews, to newValue: NotchViews) {
        guard oldValue != newValue else { return }
        statsSecondRowWorkItem?.cancel()
        if newValue == .stats && Defaults[.enableStatsFeature] {
            statsSecondRowExpansion = 0
            let workItem = DispatchWorkItem { [weak self] in
                guard let self else { return }
                withAnimation(.easeInOut(duration: self.statsSecondRowAnimationDuration)) {
                    self.statsSecondRowExpansion = 1
                }
                self.statsSecondRowWorkItem = nil
            }
            statsSecondRowWorkItem = workItem
            DispatchQueue.main.asyncAfter(deadline: .now() + statsSecondRowRevealDelay, execute: workItem)
        } else {
            withAnimation(.easeInOut(duration: 0.2)) {
                statsSecondRowExpansion = 0
            }
        }
    }

    private func handleTimerDisplayModeChange(_ mode: TimerDisplayMode) {
        guard mode == .popover, currentView == .timer else { return }
        withAnimation(.smooth) {
            currentView = .home
        }
    }

    private func handleTimerFeatureToggle(_ isEnabled: Bool) {
        guard !isEnabled, currentView == .timer else { return }
        withAnimation(.smooth) {
            currentView = .home
        }
    }

    private func handleMinimalisticModeChange(_ isEnabled: Bool) {
        guard isEnabled else { return }
        if currentView != .home {
            withAnimation(.smooth) {
                currentView = .home
            }
        }
    }
    
    func toggleSneakPeek(status: Bool, type: SneakContentType, duration: TimeInterval = 1.5, value: CGFloat = 0, icon: String = "") {
        let resolvedDuration: TimeInterval
        switch type {
        case .timer:
            resolvedDuration = 10
        case .reminder:
            resolvedDuration = Defaults[.reminderSneakPeekDuration]
        default:
            resolvedDuration = duration
        }
        sneakPeekDuration = resolvedDuration
        let bypassedTypes: [SneakContentType] = [.music, .timer, .reminder, .bluetoothAudio]
        if !bypassedTypes.contains(type) && !Defaults[.enableSystemHUD] {
            return
        }
        DispatchQueue.main.async {
            withAnimation(.smooth(duration: 0.3)) {
                self.sneakPeek.show = status
                self.sneakPeek.type = type
                self.sneakPeek.value = value
                self.sneakPeek.icon = icon
            }
        }
    }
    
    private var sneakPeekDuration: TimeInterval = 1.5
    private var sneakPeekTask: Task<Void, Never>?

    // Helper function to manage sneakPeek timer using Swift Concurrency
    private func scheduleSneakPeekHide(after duration: TimeInterval) {
        sneakPeekTask?.cancel()
        
        // Don't schedule auto-hide if duration is infinite (for persistent indicators like Caps Lock)
        guard duration.isFinite else { return }

        sneakPeekTask = Task { [weak self] in
            try? await Task.sleep(for: .seconds(duration))
            guard let self = self, !Task.isCancelled else { return }
            await MainActor.run {
                withAnimation {
                    // Hide the sneak peek with the correct type that was showing
                    self.toggleSneakPeek(status: false, type: self.sneakPeek.type)
                    self.sneakPeekDuration = 1.5
                }
            }
        }
    }
    
    @Published var sneakPeek: sneakPeek = .init() {
        didSet {
            if sneakPeek.show {
                scheduleSneakPeekHide(after: sneakPeekDuration)
            } else {
                sneakPeekTask?.cancel()
            }
        }
    }
    
    func toggleExpandingView(
        status: Bool,
        type: SneakContentType,
        value: CGFloat = 0,
        browser: BrowserType = .chromium
    ) {
        Task { @MainActor in
            withAnimation(.smooth) {
                self.expandingView.show = status
                self.expandingView.type = type
                self.expandingView.value = value
                self.expandingView.browser = browser
            }
        }
    }

    private var expandingViewTask: Task<Void, Never>?
    
    @Published var expandingView: ExpandedItem = .init() {
        didSet {
            if expandingView.show {
                expandingViewTask?.cancel()
                // Only auto-hide for battery, not for downloads (DownloadManager handles that)
                if expandingView.type != .download {
                    let duration: TimeInterval = 3
                    expandingViewTask = Task { [weak self] in
                        try? await Task.sleep(for: .seconds(duration))
                        guard let self = self, !Task.isCancelled else { return }
                        self.toggleExpandingView(status: false, type: .battery)
                    }
                }
            } else {
                expandingViewTask?.cancel()
            }
        }
    }

    
    func showEmpty() {
        currentView = .home
    }
    
    // MARK: - Clipboard Management
    @Published var shouldToggleClipboardPopover: Bool = false
    
    func toggleClipboardPopover() {
        // Toggle the published property to trigger UI updates
        shouldToggleClipboardPopover.toggle()
    }
}