import SwiftUI

struct DashboardView: View {
    @EnvironmentObject var authManager: AuthManager
    @StateObject private var healthKit = HealthKitService()
    @State private var readiness: ReadinessResponse?
    @State private var latest: LatestHealthResponse?
    @State private var isLoading = true

    var body: some View {
        ZStack {
            LinearGradient(colors: [Color(hex: "1a1a2e"), Color(hex: "16213e")], startPoint: .top, endPoint: .bottom)
                .ignoresSafeArea()
            ScrollView {
                VStack(spacing: 20) {
                    HStack {
                        Text("Привет, \(authManager.userName) 👋").font(.title2.bold()).foregroundColor(.white)
                        Spacer()
                        Button(action: { authManager.logout() }) {
                            Image(systemName: "rectangle.portrait.and.arrow.right").foregroundColor(.white.opacity(0.5))
                        }
                    }.padding(.horizontal).padding(.top)

                    if isLoading {
                        ProgressView().tint(Color(hex: "00d4aa")).padding(.top, 60)
                    } else {
                        if let r = readiness { ReadinessCardView(readiness: r) }
                        if let l = latest {
                            LazyVGrid(columns: [GridItem(.flexible()), GridItem(.flexible())], spacing: 16) {
                                if let sleep = l.sleep {
                                    MetricCardView(icon: "moon.fill", title: "Сон",
                                        value: String(format: "%.1f ч", sleep.totalSleep ?? 0),
                                        subtitle: "Глубокий: \(String(format: "%.0f мин", (sleep.deep ?? 0) * 60))",
                                        color: Color(hex: "6c63ff"))
                                }
                                if let rhr = l.restingHeartRate {
                                    MetricCardView(icon: "heart.fill", title: "Пульс покоя",
                                        value: "\(Int(rhr.value ?? 0)) уд/мин", subtitle: "Resting HR",
                                        color: Color(hex: "ff6b6b"))
                                }
                                if let hrv = l.hrv {
                                    MetricCardView(icon: "waveform.path.ecg", title: "HRV",
                                        value: "\(Int(hrv.avg ?? 0)) мс", subtitle: "Вариабельность",
                                        color: Color(hex: "00d4aa"))
                                }
                                if let steps = l.steps {
                                    MetricCardView(icon: "figure.walk", title: "Шаги",
                                        value: "\(steps.total ?? 0)", subtitle: "Сегодня",
                                        color: Color(hex: "ffa500"))
                                }
                            }.padding(.horizontal)
                        }
                    }
                    Spacer(minLength: 20)
                }
            }
        }
        .task { await loadData() }
    }

    func loadData() async {
        isLoading = true
        async let r = APIService.shared.getReadiness(token: authManager.token)
        async let l = APIService.shared.getLatest(token: authManager.token)
        readiness = try? await r
        latest = try? await l
        isLoading = false
    }
}