import CoreGraphics
import Foundation
import SwiftUI

extension RootTabs {
    private static var sidebarPersistentWidthThreshold: CGFloat {
        980
    }

    static let sidebarSplitIdealWidth: CGFloat = 316
    static let sidebarSplitMaximumWidth: CGFloat = 340
    static let sidebarDrawerMaximumWidth: CGFloat = 340
    static let sidebarShowButtonAccessibilityIdentifier = "RootTabs.Sidebar.Show"
    static let sidebarHideButtonAccessibilityIdentifier = "RootTabs.Sidebar.Hide"

    enum AppTab: Hashable {
        case control
        case chat
        case talk
        case agent
        case settings
    }

    enum SidebarDestination: String, CaseIterable, Hashable, Identifiable {
        case chat
        case talk
        case overview
        case activity
        case agents
        case workboard
        case skillWorkshop
        case instances
        case sessions
        case dreaming
        case usage
        case cron
        case docs
        case settings
        case gateway

        var id: String {
            rawValue
        }

        var title: String {
            switch self {
            case .chat: "Chat"
            case .talk: "Talk"
            case .overview: "Overview"
            case .activity: "Activity"
            case .agents: "Agents"
            case .workboard: "Workboard"
            case .skillWorkshop: "Skill Workshop"
            case .instances: "Instances"
            case .sessions: "Sessions"
            case .dreaming: "Dreaming"
            case .usage: "Usage"
            case .cron: "Cron Jobs"
            case .docs: "Docs"
            case .settings: "Settings"
            case .gateway: "Settings / Gateway"
            }
        }

        var sidebarTitle: String {
            switch self {
            case .gateway: "Connection"
            default: self.title
            }
        }

        var subtitle: String {
            switch self {
            case .chat: "Agent chat and recent work."
            case .talk: "Realtime voice and fallback controls."
            case .overview: "Status, entry points, health."
            case .activity: "Gateway, session, and device activity."
            case .agents: "Agent roster and readiness."
            case .workboard: "Agent work queue and session handoff."
            case .skillWorkshop: "Review and apply proposed skills."
            case .instances: "Latest presence from OpenClaw nodes."
            case .sessions: "Active sessions and defaults."
            case .dreaming: "Memory signals and background synthesis."
            case .usage: "API usage and costs."
            case .cron: "Wakeups and recurring runs."
            case .docs: "Reference docs and setup guides."
            case .settings: "Connection, permissions, channels, and app options."
            case .gateway: "Pairing, diagnostics, permissions, and device controls."
            }
        }

        var systemImage: String {
            switch self {
            case .chat: "bubble.left"
            case .talk: "waveform.circle"
            case .overview: "chart.bar"
            case .activity: "waveform.path.ecg"
            case .agents: "person.2"
            case .workboard: "folder"
            case .skillWorkshop: "hammer"
            case .instances: "dot.radiowaves.left.and.right"
            case .sessions: "doc.text"
            case .dreaming: "moon.stars"
            case .usage: "chart.bar.xaxis"
            case .cron: "timer"
            case .docs: "book"
            case .settings: "gearshape"
            case .gateway: "gearshape"
            }
        }

        var appTab: AppTab {
            switch self {
            case .chat:
                .chat
            case .talk:
                .talk
            case .agents:
                .agent
            case .settings, .gateway:
                .settings
            case .overview, .activity, .workboard, .skillWorkshop, .instances, .sessions, .dreaming,
                 .usage,
                 .cron, .docs:
                .control
            }
        }

        var settingsRoute: SettingsRoute? {
            switch self {
            case .gateway:
                .gateway
            case .chat, .talk, .overview, .activity, .agents, .workboard, .skillWorkshop, .instances, .sessions,
                 .dreaming,
                 .usage, .cron, .settings, .docs:
                nil
            }
        }
    }

    enum SidebarLayoutMode: Equatable {
        case drawer
        case split
    }

    static func sidebarLayoutMode(containerSize: CGSize) -> SidebarLayoutMode {
        containerSize.width < self.sidebarPersistentWidthThreshold || containerSize.height > containerSize.width
            ? .drawer
            : .split
    }

    static func preferredSidebarVisibility(layoutMode: SidebarLayoutMode) -> Bool {
        layoutMode == .split
    }

    static func shouldCollapseSidebarAfterSelection(layoutMode: SidebarLayoutMode) -> Bool {
        layoutMode == .drawer
    }

    static func sidebarWidth(containerWidth: CGFloat, isDrawerLayout: Bool) -> CGFloat {
        if isDrawerLayout {
            return min(self.sidebarDrawerMaximumWidth, max(280, containerWidth * 0.86))
        }
        return min(self.sidebarSplitMaximumWidth, max(self.sidebarSplitIdealWidth, containerWidth * 0.25))
    }

    static func shouldShowSidebarRevealControl(isSidebarVisible: Bool) -> Bool {
        !isSidebarVisible
    }

    static func shouldShowSidebarRevealInDestinationHeader(
        isSidebarVisible: Bool,
        layoutMode: SidebarLayoutMode) -> Bool
    {
        switch layoutMode {
        case .split:
            true
        case .drawer:
            self.shouldShowSidebarRevealControl(isSidebarVisible: isSidebarVisible)
        }
    }

    static func requestedInitialSidebarVisibility(arguments: [String]) -> Bool? {
        guard let flagIndex = arguments.firstIndex(of: "--openclaw-sidebar-visibility") else {
            return nil
        }
        let valueIndex = arguments.index(after: flagIndex)
        guard arguments.indices.contains(valueIndex) else { return nil }

        switch arguments[valueIndex].trimmingCharacters(in: .whitespacesAndNewlines).lowercased() {
        case "visible", "show", "shown", "open", "true", "1":
            return true
        case "hidden", "hide", "closed", "false", "0":
            return false
        default:
            return nil
        }
    }

    static func shouldOpenRootTabFromPhoneHub(_ destination: SidebarDestination) -> Bool {
        switch destination {
        case .chat, .talk, .agents, .gateway, .settings:
            true
        case .overview, .activity, .workboard, .skillWorkshop, .instances, .sessions, .dreaming,
             .usage,
             .cron, .docs:
            false
        }
    }

    static func defaultSidebarDestination(for tab: AppTab) -> SidebarDestination {
        switch tab {
        case .control:
            .overview
        case .chat:
            .chat
        case .talk:
            .talk
        case .agent:
            .agents
        case .settings:
            .settings
        }
    }

    enum StartupPresentationRoute: Equatable {
        case none
        case onboarding
        case settings
    }

    static func startupPresentationRoute(
        gatewayConnected: Bool,
        hasConnectedOnce: Bool,
        onboardingComplete: Bool,
        hasExistingGatewayConfig: Bool,
        shouldPresentOnLaunch: Bool) -> StartupPresentationRoute
    {
        if gatewayConnected {
            return .none
        }
        if shouldPresentOnLaunch || !hasConnectedOnce || !onboardingComplete {
            return .onboarding
        }
        if !hasExistingGatewayConfig {
            return .settings
        }
        return .none
    }

    static func shouldPresentQuickSetup(
        quickSetupDismissed: Bool,
        showOnboarding: Bool,
        hasPresentedSheet: Bool,
        gatewayConnected: Bool,
        hasExistingGatewayConfig: Bool,
        discoveredGatewayCount: Int) -> Bool
    {
        guard !quickSetupDismissed else { return false }
        guard !showOnboarding else { return false }
        guard !hasPresentedSheet else { return false }
        guard !gatewayConnected else { return false }
        guard !hasExistingGatewayConfig else { return false }
        return discoveredGatewayCount > 0
    }

    struct SidebarGroup: Identifiable {
        let title: String
        let destinations: [SidebarDestination]

        var id: String {
            self.title
        }
    }

    static let sidebarGroups: [SidebarGroup] = [
        SidebarGroup(title: "CHAT", destinations: [.chat, .talk]),
        SidebarGroup(
            title: "CONTROL",
            destinations: [
                .overview,
                .activity,
                .agents,
                .workboard,
                .skillWorkshop,
                .instances,
                .sessions,
                .dreaming,
                .usage,
                .cron,
            ]),
        SidebarGroup(
            title: "SETTINGS",
            destinations: [.settings]),
        SidebarGroup(title: "REFERENCE", destinations: [.docs]),
    ]

    static var phoneControlGroups: [SidebarGroup] {
        self.sidebarGroups
            .map { group in
                SidebarGroup(
                    title: group.title,
                    destinations: group.destinations.filter { $0 != .agents })
            }
            .filter { !$0.destinations.isEmpty }
    }
}