//
//  HomeView.swift
//  SportsTime
//

import SwiftUI
import SwiftData

struct HomeView: View {
    @Environment(\.modelContext) private var modelContext
    @Environment(\.colorScheme) private var colorScheme
    @Query(sort: \SavedTrip.updatedAt, order: .reverse) private var savedTrips: [SavedTrip]

    @State private var showNewTrip = false
    @State private var selectedSport: Sport?
    @State private var selectedTab = 0
    @State private var suggestedTripsGenerator = SuggestedTripsGenerator()
    @State private var selectedSuggestedTrip: SuggestedTrip?
    @State private var displayedTips: [PlanningTip] = []

    var body: some View {
        TabView(selection: $selectedTab) {
            // Home Tab
            NavigationStack {
                ScrollView {
                    VStack(spacing: Theme.Spacing.xl) {
                        // Hero Card
                        heroCard
                            .staggeredAnimation(index: 0)

                        // Quick Actions
                        quickActions
                            .staggeredAnimation(index: 1)

                        // Suggested Trips
                        suggestedTripsSection
                            .staggeredAnimation(index: 2)

                        // Saved Trips
                        if !savedTrips.isEmpty {
                            savedTripsSection
                                .staggeredAnimation(index: 3)
                        }

                        // Featured / Tips
                        tipsSection
                            .staggeredAnimation(index: 4)
                    }
                    .padding(Theme.Spacing.md)
                }
                .themedBackground()
                .toolbar {
                    ToolbarItem(placement: .primaryAction) {
                        Button {
                            showNewTrip = true
                        } label: {
                            Image(systemName: "plus.circle.fill")
                                .font(.title2)
                                .foregroundStyle(Theme.warmOrange)
                        }
                    }
                }
            }
            .tabItem {
                Label("Home", systemImage: "house.fill")
            }
            .tag(0)

            // Schedule Tab
            NavigationStack {
                ScheduleListView()
            }
            .tabItem {
                Label("Schedule", systemImage: "calendar")
            }
            .tag(1)

            // My Trips Tab
            NavigationStack {
                SavedTripsListView(trips: savedTrips)
            }
            .tabItem {
                Label("My Trips", systemImage: "suitcase.fill")
            }
            .tag(2)

            // Progress Tab
            NavigationStack {
                ProgressTabView()
            }
            .tabItem {
                Label("Progress", systemImage: "chart.bar.fill")
            }
            .tag(3)

            // Settings Tab
            NavigationStack {
                SettingsView()
            }
            .tabItem {
                Label("Settings", systemImage: "gear")
            }
            .tag(4)
        }
        .tint(Theme.warmOrange)
        .sheet(isPresented: $showNewTrip) {
            TripWizardView()
        }
        .onChange(of: showNewTrip) { _, isShowing in
            if !isShowing {
                selectedSport = nil
            }
        }
        .task {
            if suggestedTripsGenerator.suggestedTrips.isEmpty && !suggestedTripsGenerator.isLoading {
                await suggestedTripsGenerator.generateTrips()
            }
        }
        .sheet(item: $selectedSuggestedTrip) { suggestedTrip in
            NavigationStack {
                TripDetailView(trip: suggestedTrip.trip, games: suggestedTrip.richGames)
            }
        }
    }

    // MARK: - Hero Card

    private var heroCard: some View {
        VStack(spacing: Theme.Spacing.lg) {
            VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
                Text("Adventure Awaits")
                    .font(.largeTitle)
                    .foregroundStyle(Theme.textPrimary(colorScheme))

                Text("Plan your ultimate sports road trip. Visit stadiums, catch games, and create unforgettable memories.")
                    .font(.body)
                    .foregroundStyle(Theme.textSecondary(colorScheme))
                    .fixedSize(horizontal: false, vertical: true)
            }
            .frame(maxWidth: .infinity, alignment: .leading)

            Button {
                showNewTrip = true
            } label: {
                HStack(spacing: Theme.Spacing.xs) {
                    Image(systemName: "map.fill")
                    Text("Start Planning")
                        .fontWeight(.semibold)
                }
                .frame(maxWidth: .infinity)
                .padding(Theme.Spacing.md)
                .background(Theme.warmOrange)
                .foregroundStyle(.white)
                .clipShape(RoundedRectangle(cornerRadius: Theme.CornerRadius.medium))
            }
            .pressableStyle()
            .glowEffect(color: Theme.warmOrange, radius: 12)
        }
        .padding(Theme.Spacing.lg)
        .background(Theme.cardBackground(colorScheme))
        .clipShape(RoundedRectangle(cornerRadius: Theme.CornerRadius.xlarge))
        .overlay {
            RoundedRectangle(cornerRadius: Theme.CornerRadius.xlarge)
                .stroke(Theme.surfaceGlow(colorScheme), lineWidth: 1)
        }
        .shadow(color: Theme.cardShadow(colorScheme), radius: 15, y: 8)
    }

    // MARK: - Quick Actions

    private var quickActions: some View {
        VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
            Text("Quick Start")
                .font(.title2)
                .foregroundStyle(Theme.textPrimary(colorScheme))

            SportSelectorGrid { sport in
                selectedSport = sport
                showNewTrip = true
            }
            .padding(.horizontal, Theme.Spacing.md)
            .padding(.vertical, Theme.Spacing.md)
            .background(Theme.cardBackground(colorScheme))
            .clipShape(RoundedRectangle(cornerRadius: Theme.CornerRadius.large))
            .overlay {
                RoundedRectangle(cornerRadius: Theme.CornerRadius.large)
                    .stroke(Theme.surfaceGlow(colorScheme), lineWidth: 1)
            }
        }
    }

    // MARK: - Suggested Trips

    @ViewBuilder
    private var suggestedTripsSection: some View {
        if suggestedTripsGenerator.isLoading {
            LoadingTripsView(message: suggestedTripsGenerator.loadingMessage)
        } else if !suggestedTripsGenerator.suggestedTrips.isEmpty {
            VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
                // Header with refresh button
                HStack {
                    Text("Featured Trips")
                        .font(.title2)
                        .foregroundStyle(Theme.textPrimary(colorScheme))

                    Spacer()

                    Button {
                        Task {
                            await suggestedTripsGenerator.refreshTrips()
                        }
                    } label: {
                        Image(systemName: "arrow.clockwise")
                            .font(.subheadline)
                            .foregroundStyle(Theme.warmOrange)
                    }
                }

                // Horizontal carousel grouped by region
                ScrollView(.horizontal, showsIndicators: false) {
                    HStack(spacing: Theme.Spacing.lg) {
                        ForEach(suggestedTripsGenerator.tripsByRegion, id: \.region) { regionGroup in
                            VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
                                // Region header
                                HStack(spacing: Theme.Spacing.xs) {
                                    Image(systemName: regionGroup.region.iconName)
                                        .font(.caption)
                                    Text(regionGroup.region.shortName)
                                        .font(.subheadline)
                                }
                                .foregroundStyle(Theme.textSecondary(colorScheme))

                                // Trip cards for this region
                                HStack(spacing: Theme.Spacing.md) {
                                    ForEach(regionGroup.trips) { suggestedTrip in
                                        Button {
                                            selectedSuggestedTrip = suggestedTrip
                                        } label: {
                                            SuggestedTripCard(suggestedTrip: suggestedTrip)
                                        }
                                        .buttonStyle(.plain)
                                    }
                                }
                            }
                        }
                    }
                    .padding(.horizontal, 1) // Prevent clipping
                }
            }
        } else if let error = suggestedTripsGenerator.error {
            // Error state
            VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
                Text("Featured Trips")
                    .font(.title2)
                    .foregroundStyle(Theme.textPrimary(colorScheme))

                HStack {
                    Image(systemName: "exclamationmark.triangle")
                        .foregroundStyle(.orange)
                    Text(error)
                        .font(.subheadline)
                        .foregroundStyle(Theme.textSecondary(colorScheme))

                    Spacer()

                    Button("Retry") {
                        Task {
                            await suggestedTripsGenerator.generateTrips()
                        }
                    }
                    .font(.subheadline)
                    .foregroundStyle(Theme.warmOrange)
                }
                .padding(Theme.Spacing.md)
                .background(Theme.cardBackground(colorScheme))
                .clipShape(RoundedRectangle(cornerRadius: Theme.CornerRadius.medium))
            }
        }
    }

    // MARK: - Saved Trips

    private var savedTripsSection: some View {
        VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
            HStack {
                Text("Recent Trips")
                    .font(.title2)
                    .foregroundStyle(Theme.textPrimary(colorScheme))
                Spacer()
                Button {
                    selectedTab = 2
                } label: {
                    HStack(spacing: 4) {
                        Text("See All")
                        Image(systemName: "chevron.right")
                            .font(.caption)
                    }
                    .font(.subheadline)
                    .foregroundStyle(Theme.warmOrange)
                }
            }

            ForEach(Array(savedTrips.prefix(3).enumerated()), id: \.element.id) { index, savedTrip in
                if let trip = savedTrip.trip {
                    SavedTripCard(savedTrip: savedTrip, trip: trip)
                        .staggeredAnimation(index: index, delay: 0.05)
                }
            }
        }
    }

    // MARK: - Tips

    private var tipsSection: some View {
        VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
            Text("Planning Tips")
                .font(.title2)
                .foregroundStyle(Theme.textPrimary(colorScheme))

            VStack(spacing: Theme.Spacing.xs) {
                ForEach(displayedTips) { tip in
                    TipRow(icon: tip.icon, title: tip.title, subtitle: tip.subtitle)
                }
            }
            .padding(Theme.Spacing.md)
            .background(Theme.cardBackground(colorScheme))
            .clipShape(RoundedRectangle(cornerRadius: Theme.CornerRadius.large))
            .overlay {
                RoundedRectangle(cornerRadius: Theme.CornerRadius.large)
                    .stroke(Theme.surfaceGlow(colorScheme), lineWidth: 1)
            }
        }
        .onAppear {
            if displayedTips.isEmpty {
                displayedTips = PlanningTips.random(3)
            }
        }
    }
}

// MARK: - Supporting Views

struct SavedTripCard: View {
    let savedTrip: SavedTrip
    let trip: Trip
    @Environment(\.colorScheme) private var colorScheme

    var body: some View {
        NavigationLink {
            TripDetailView(trip: trip, games: savedTrip.games)
        } label: {
            HStack(spacing: Theme.Spacing.md) {
                // Route preview icon
                ZStack {
                    Circle()
                        .fill(Theme.warmOrange.opacity(0.15))
                        .frame(width: 44, height: 44)

                    Image(systemName: "map.fill")
                        .foregroundStyle(Theme.warmOrange)
                }

                VStack(alignment: .leading, spacing: 4) {
                    Text(trip.name)
                        .font(.body)
                        .foregroundStyle(Theme.textPrimary(colorScheme))

                    Text(trip.formattedDateRange)
                        .font(.subheadline)
                        .foregroundStyle(Theme.textSecondary(colorScheme))

                    HStack(spacing: Theme.Spacing.sm) {
                        HStack(spacing: 4) {
                            Image(systemName: "mappin")
                                .font(.caption2)
                            Text("\(trip.stops.count) cities")
                        }
                        HStack(spacing: 4) {
                            Image(systemName: "sportscourt")
                                .font(.caption2)
                            Text("\(trip.totalGames) games")
                        }
                    }
                    .font(.caption)
                    .foregroundStyle(Theme.textMuted(colorScheme))
                }

                Spacer()

                Image(systemName: "chevron.right")
                    .font(.caption)
                    .foregroundStyle(Theme.textMuted(colorScheme))
            }
            .padding(Theme.Spacing.md)
            .background(Theme.cardBackground(colorScheme))
            .clipShape(RoundedRectangle(cornerRadius: Theme.CornerRadius.medium))
            .overlay {
                RoundedRectangle(cornerRadius: Theme.CornerRadius.medium)
                    .stroke(Theme.surfaceGlow(colorScheme), lineWidth: 1)
            }
        }
        .buttonStyle(.plain)
    }
}

struct TipRow: View {
    let icon: String
    let title: String
    let subtitle: String
    @Environment(\.colorScheme) private var colorScheme

    var body: some View {
        HStack(spacing: Theme.Spacing.sm) {
            ZStack {
                Circle()
                    .fill(Theme.routeGold.opacity(0.15))
                    .frame(width: 36, height: 36)

                Image(systemName: icon)
                    .font(.subheadline)
                    .foregroundStyle(Theme.routeGold)
            }

            VStack(alignment: .leading, spacing: 2) {
                Text(title)
                    .font(.subheadline)
                    .foregroundStyle(Theme.textPrimary(colorScheme))
                Text(subtitle)
                    .font(.caption)
                    .foregroundStyle(Theme.textSecondary(colorScheme))
            }

            Spacer()
        }
    }
}

// MARK: - Saved Trips List View

struct SavedTripsListView: View {
    let trips: [SavedTrip]
    @Environment(\.colorScheme) private var colorScheme

    /// Trips sorted by most cities (stops) first
    private var sortedTrips: [SavedTrip] {
        trips.sorted { ($0.trip?.stops.count ?? 0) > ($1.trip?.stops.count ?? 0) }
    }

    var body: some View {
        ScrollView {
            if trips.isEmpty {
                VStack(spacing: 16) {
                    Spacer()
                        .frame(height: 100)

                    Image(systemName: "suitcase")
                        .font(.largeTitle)
                        .foregroundColor(.secondary)

                    Text("No Saved Trips")
                        .font(.title2)
                        .fontWeight(.semibold)

                    Text("Browse featured trips on the Home tab or create your own to get started.")
                        .font(.subheadline)
                        .foregroundColor(.secondary)
                        .multilineTextAlignment(.center)
                        .padding(.horizontal, 40)
                }
                .frame(maxWidth: .infinity)
            } else {
                LazyVStack(spacing: Theme.Spacing.md) {
                    ForEach(Array(sortedTrips.enumerated()), id: \.element.id) { index, savedTrip in
                        if let trip = savedTrip.trip {
                            NavigationLink {
                                TripDetailView(trip: trip, games: savedTrip.games)
                            } label: {
                                SavedTripListRow(trip: trip)
                            }
                            .buttonStyle(.plain)
                            .staggeredAnimation(index: index)
                        }
                    }
                }
                .padding(Theme.Spacing.md)
            }
        }
        .themedBackground()
    }
}

struct SavedTripListRow: View {
    let trip: Trip
    @Environment(\.colorScheme) private var colorScheme

    var body: some View {
        HStack(spacing: Theme.Spacing.md) {
            // Route preview
            VStack(spacing: 4) {
                ForEach(0..<min(3, trip.stops.count), id: \.self) { i in
                    Circle()
                        .fill(Theme.warmOrange.opacity(Double(3 - i) / 3))
                        .frame(width: 8, height: 8)
                    if i < min(2, trip.stops.count - 1) {
                        Rectangle()
                            .fill(Theme.routeGold.opacity(0.5))
                            .frame(width: 2, height: 8)
                    }
                }
            }
            .frame(width: 20)

            VStack(alignment: .leading, spacing: Theme.Spacing.xs) {
                Text(trip.name)
                    .font(.headline)
                    .foregroundStyle(Theme.textPrimary(colorScheme))

                Text(trip.formattedDateRange)
                    .font(.subheadline)
                    .foregroundStyle(Theme.textSecondary(colorScheme))

                // Route preview strip
                if !trip.stops.isEmpty {
                    RoutePreviewStrip(cities: trip.stops.map { $0.city })
                }

                // Stats
                HStack(spacing: Theme.Spacing.md) {
                    StatPill(icon: "mappin.circle", value: "\(trip.stops.count) cities")
                    StatPill(icon: "sportscourt", value: "\(trip.totalGames) games")
                }
            }

            Spacer()

            Image(systemName: "chevron.right")
                .font(.caption)
                .foregroundStyle(Theme.textMuted(colorScheme))
        }
        .padding(Theme.Spacing.lg)
        .background(Theme.cardBackground(colorScheme))
        .clipShape(RoundedRectangle(cornerRadius: Theme.CornerRadius.large))
        .overlay {
            RoundedRectangle(cornerRadius: Theme.CornerRadius.large)
                .stroke(Theme.surfaceGlow(colorScheme), lineWidth: 1)
        }
        .shadow(color: Theme.cardShadow(colorScheme), radius: 8, y: 4)
    }
}

#Preview {
    HomeView()
        .modelContainer(for: SavedTrip.self, inMemory: true)
}