platform/ios/Platform/Platform/ContentView.swift

import SwiftUI

struct ContentView: View {
    @Environment(AuthManager.self) private var auth

    var body: some View {
        Group {
            if auth.isCheckingAuth {
                ProgressView()
                    .frame(maxWidth: .infinity, maxHeight: .infinity)
                    .background(Color.canvas)
            } else if auth.isLoggedIn {
                MainTabView()
            } else {
                LoginView()
            }
        }
        .task {
            await auth.checkAuth()
        }
    }
}

struct MainTabView: View {
    @State private var selectedTab = 0
    @State private var showAssistant = false

    var body: some View {
        ZStack(alignment: .bottomTrailing) {
            TabView(selection: $selectedTab) {
                HomeView()
                    .tabItem {
                        Label("Home", systemImage: "house.fill")
                    }
                    .tag(0)

                FitnessTabView()
                    .tabItem {
                        Label("Fitness", systemImage: "flame.fill")
                    }
                    .tag(1)
            }
            .tint(Color.accentWarm)

            Button {
                showAssistant = true
            } label: {
                Image(systemName: "plus")
                    .font(.title2.weight(.semibold))
                    .foregroundStyle(.white)
                    .frame(width: 56, height: 56)
                    .background(Color.accentWarm)
                    .clipShape(Circle())
                    .shadow(color: .black.opacity(0.2), radius: 8, y: 4)
            }
            .padding(.trailing, 20)
            .padding(.bottom, 70)
        }
        .sheet(isPresented: $showAssistant) {
            AssistantSheetView()
        }
    }
}

struct AssistantSheetView: View {
    @Environment(\.dismiss) private var dismiss
    @State private var selectedMode = 0

    var body: some View {
        VStack(spacing: 0) {
            // Custom header — warm background
            VStack(spacing: 12) {
                // Drag handle
                Capsule()
                    .fill(Color.textTertiary.opacity(0.3))
                    .frame(width: 36, height: 5)
                    .padding(.top, 8)

                Text("Add Food")
                    .font(.headline)
                    .foregroundStyle(Color.textPrimary)

                // Tab picker — warm styled
                HStack(spacing: 4) {
                    tabButton("AI Chat", icon: "sparkles", index: 0)
                    tabButton("Quick Add", icon: "magnifyingglass", index: 1)
                }
                .padding(4)
                .background(Color.textTertiary.opacity(0.08))
                .clipShape(Capsule())
                .padding(.horizontal, 40)
            }
            .padding(.bottom, 12)
            .background(Color.canvas)

            // Content
            if selectedMode == 0 {
                AssistantChatView()
            } else {
                FoodSearchView(isSheet: true)
            }
        }
        .background(Color.canvas)
        .presentationDetents([.large])
    }

    private func tabButton(_ title: String, icon: String, index: Int) -> some View {
        Button {
            withAnimation(.easeInOut(duration: 0.2)) { selectedMode = index }
        } label: {
            HStack(spacing: 5) {
                Image(systemName: icon)
                    .font(.caption2)
                Text(title)
                    .font(.subheadline.weight(selectedMode == index ? .semibold : .regular))
            }
            .foregroundStyle(selectedMode == index ? Color.textPrimary : Color.textTertiary)
            .padding(.horizontal, 16)
            .padding(.vertical, 8)
            .background(selectedMode == index ? Color.surfaceCard : Color.clear)
            .clipShape(Capsule())
        }
    }
}