import SwiftUI
import HealthKit

struct ContentView: View {
    @EnvironmentObject private var workout: WorkoutManager

    var body: some View {
        if workout.isRunning {
            LiveWorkoutView()
        } else {
            ActivityPickerView()
        }
    }
}

struct ActivityPickerView: View {
    @EnvironmentObject private var workout: WorkoutManager

    private struct Activity: Identifiable {
        let id = UUID()
        let label: String
        let symbol: String
        let type: HKWorkoutActivityType
        let location: HKWorkoutSessionLocationType
    }

    private let activities: [Activity] = [
        .init(label: "Course", symbol: "figure.run", type: .running, location: .outdoor),
        .init(label: "Vélo", symbol: "figure.outdoor.cycle", type: .cycling, location: .outdoor),
        .init(label: "Marche", symbol: "figure.walk", type: .walking, location: .outdoor),
        .init(label: "Renfo", symbol: "dumbbell", type: .traditionalStrengthTraining, location: .indoor)
    ]

    var body: some View {
        ScrollView {
            VStack(spacing: 8) {
                ForEach(activities) { activity in
                    Button {
                        Task {
                            await workout.startWorkout(activityType: activity.type,
                                                       locationType: activity.location)
                        }
                    } label: {
                        Label(activity.label, systemImage: activity.symbol)
                            .frame(maxWidth: .infinity, alignment: .leading)
                    }
                }
                Button {
                    workout.startSimulation()
                } label: {
                    Label("Test (FC simulée)", systemImage: "waveform.path.ecg")
                        .frame(maxWidth: .infinity, alignment: .leading)
                }
                .tint(.gray)

                if let message = workout.statusMessage {
                    Text(message)
                        .font(.footnote)
                        .foregroundStyle(.secondary)
                }
            }
            .padding(.horizontal, 4)
        }
        .navigationTitle("Coach")
    }
}

struct LiveWorkoutView: View {
    @EnvironmentObject private var workout: WorkoutManager
    @EnvironmentObject private var connectivity: ConnectivityManager

    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 10) {
                Metric(label: "FC", value: "\(Int(workout.heartRate))", unit: "bpm", color: .red)
                Metric(label: "Calories", value: "\(Int(workout.activeEnergyKcal))", unit: "kcal", color: .orange)
                Metric(label: "Distance",
                       value: String(format: "%.2f", workout.distanceMeters / 1000),
                       unit: "km", color: .blue)
                Metric(label: "Durée", value: Self.timeString(workout.elapsedSec), unit: "", color: .green)

                HStack(spacing: 4) {
                    Image(systemName: connectivity.isReachable
                          ? "iphone.radiowaves.left.and.right" : "iphone.slash")
                        .foregroundStyle(connectivity.isReachable ? .green : .secondary)
                    Text(connectivity.isReachable ? "iPhone connecté" : "iPhone hors de portée")
                        .font(.caption2)
                        .foregroundStyle(.secondary)
                }

                Button(role: .destructive) {
                    workout.end()
                } label: {
                    Label("Terminer", systemImage: "stop.fill")
                        .frame(maxWidth: .infinity)
                }
            }
            .padding(.horizontal, 4)
        }
    }

    private static func timeString(_ seconds: Double) -> String {
        let total = Int(seconds)
        let h = total / 3600
        let m = (total % 3600) / 60
        let s = total % 60
        return h > 0
            ? String(format: "%d:%02d:%02d", h, m, s)
            : String(format: "%02d:%02d", m, s)
    }
}

private struct Metric: View {
    let label: String
    let value: String
    let unit: String
    let color: Color

    var body: some View {
        VStack(alignment: .leading, spacing: 0) {
            Text(label)
                .font(.caption2)
                .foregroundStyle(.secondary)
            HStack(alignment: .firstTextBaseline, spacing: 2) {
                Text(value)
                    .font(.system(size: 30, weight: .semibold, design: .rounded))
                    .foregroundStyle(color)
                if !unit.isEmpty {
                    Text(unit)
                        .font(.caption)
                        .foregroundStyle(.secondary)
                }
            }
        }
    }
}

#Preview {
    ContentView()
        .environmentObject(WorkoutManager.shared)
        .environmentObject(ConnectivityManager.shared)
}