import SwiftUI

// HabitsView is now used by TrackerView (HabitListView).
// This file kept for backward compat but MainTabView uses TrackerView.
struct HabitsView: View {
    @EnvironmentObject var authManager: AuthManager
    @State private var habits: [Habit] = []
    @State private var isLoading = true
    @State private var showAddHabit = false

    var completedCount: Int { habits.filter { $0.completedToday == true }.count }

    var body: some View {
        ZStack {
            Color(hex: "06060f").ignoresSafeArea()
            VStack(spacing: 0) {
                HStack {
                    VStack(alignment: .leading) {
                        Text("Привычки").font(.title.bold()).foregroundColor(.white)
                        Text("\(completedCount)/\(habits.count) выполнено").font(.subheadline).foregroundColor(Color(hex: "8888aa"))
                    }
                    Spacer()
                    Button(action: { showAddHabit = true }) {
                        Image(systemName: "plus.circle.fill").font(.title2).foregroundColor(Color(hex: "0D9488"))
                    }
                }.padding()

                if !habits.isEmpty {
                    GeometryReader { geo in
                        ZStack(alignment: .leading) {
                            RoundedRectangle(cornerRadius: 4).fill(Color.white.opacity(0.1))
                            RoundedRectangle(cornerRadius: 4).fill(Color(hex: "0D9488"))
                                .frame(width: geo.size.width * CGFloat(completedCount) / CGFloat(max(habits.count, 1)))
                        }
                    }
                    .frame(height: 6).padding(.horizontal).padding(.bottom, 16)
                }

                if isLoading {
                    ProgressView().tint(Color(hex: "0D9488")).padding(.top, 40); Spacer()
                } else if habits.isEmpty {
                    VStack(spacing: 12) {
                        Text("🔥").font(.system(size: 50))
                        Text("Нет привычек").foregroundColor(Color(hex: "8888aa"))
                    }.padding(.top, 60); Spacer()
                } else {
                    List {
                        ForEach(habits) { habit in
                            HabitRowView(habit: habit) { await logHabit(habit) }
                                .listRowBackground(Color.clear).listRowSeparator(.hidden)
                        }
                    }
                    .listStyle(.plain).scrollContentBackground(.hidden)
                }
            }
        }
        .task { await loadHabits() }
        .refreshable { await loadHabits(refresh: true) }
        .sheet(isPresented: $showAddHabit) {
            AddHabitView(isPresented: $showAddHabit) { await loadHabits(refresh: true) }
                .presentationDetents([.large]).presentationDragIndicator(.visible)
                .presentationBackground(Color(hex: "06060f"))
        }
    }

    func loadHabits(refresh: Bool = false) async {
        if !refresh { isLoading = true }
        habits = (try? await APIService.shared.getHabits(token: authManager.token)) ?? []
        isLoading = false
    }

    func logHabit(_ habit: Habit) async {
        try? await APIService.shared.logHabit(token: authManager.token, id: habit.id)
        await loadHabits()
        UIImpactFeedbackGenerator(style: .medium).impactOccurred()
    }
}