import SwiftUI

struct MainTabView: View {
    @EnvironmentObject var authManager: AuthManager
    @AppStorage("colorScheme") private var colorSchemeRaw: String = "dark"
    @State private var selectedTab = 0

    var preferredColorScheme: ColorScheme? {
        colorSchemeRaw == "light" ? .light : .dark
    }

    let tabs: [(icon: String, label: String, color: Color)] = [
        ("house.fill", "Главная", Theme.teal),
        ("chart.bar.fill", "Трекер", Theme.indigo),
        ("heart.fill", "Здоровье", Theme.pink),
        ("building.columns.fill", "Накопления", Theme.purple),
        ("gearshape.fill", "Ещё", Theme.blue),
    ]

    var body: some View {
        VStack(spacing: 0) {
            // Content
            Group {
                switch selectedTab {
                case 0: DashboardView()
                case 1: TrackerView()
                case 2: HealthView()
                case 3: SavingsView()
                case 4: SettingsView()
                default: DashboardView()
                }
            }
            .frame(maxWidth: .infinity, maxHeight: .infinity)

            // Custom Tab Bar
            HStack(spacing: 0) {
                ForEach(0..<tabs.count, id: \.self) { index in
                    TabBarButton(
                        icon: tabs[index].icon,
                        label: tabs[index].label,
                        color: tabs[index].color,
                        isSelected: selectedTab == index
                    ) {
                        withAnimation(.easeInOut(duration: 0.2)) {
                            selectedTab = index
                        }
                        UIImpactFeedbackGenerator(style: .light).impactOccurred()
                    }
                }
            }
            .padding(.horizontal, 8)
            .padding(.top, 8)
            .padding(.bottom, 4)
            .background(
                Color(hex: "06060f")
                    .overlay(alignment: .top) {
                        Rectangle()
                            .fill(Color.white.opacity(0.06))
                            .frame(height: 0.5)
                    }
            )
        }
        .preferredColorScheme(preferredColorScheme)
    }
}

// MARK: - Tab Bar Button

struct TabBarButton: View {
    let icon: String
    let label: String
    let color: Color
    let isSelected: Bool
    let action: () -> Void

    var body: some View {
        Button(action: action) {
            VStack(spacing: 4) {
                ZStack {
                    if isSelected {
                        // Glow effect
                        Circle()
                            .fill(color.opacity(0.3))
                            .frame(width: 40, height: 40)
                            .blur(radius: 10)

                        Circle()
                            .fill(color.opacity(0.15))
                            .frame(width: 36, height: 36)
                    }

                    Image(systemName: icon)
                        .font(.system(size: 18, weight: isSelected ? .semibold : .regular))
                        .foregroundColor(isSelected ? color : Color(hex: "555566"))
                }
                .frame(height: 32)

                Text(label)
                    .font(.system(size: 10, weight: isSelected ? .medium : .regular))
                    .foregroundColor(isSelected ? color : Color(hex: "555566"))
            }
            .frame(maxWidth: .infinity)
        }
        .buttonStyle(.plain)
    }
}