import SwiftUI

struct WorkoutDetailView: View {
    @ObservedObject var workoutManager: WorkoutManager

    var body: some View {
        List {
            if let workout = workoutManager.selectedWorkout {
                Section {
                    VStack(spacing: 8) {
                        Text(workout.name ?? "Workout")
                            .font(.headline)

                        Text("\(Int(workout.poolLength))m pool")
                            .font(.caption)
                            .foregroundColor(.secondary)

                        let totalM = workout.sets.reduce(0) { $0 + $1.distancePerRep * $1.repCount }
                        Text("\(totalM)m total")
                            .font(.caption)
                            .foregroundColor(.secondary)
                    }
                    .frame(maxWidth: .infinity)
                    .padding(.vertical, 4)
                }

                Section("Sets") {
                    ForEach(Array(workout.sets.enumerated()), id: \.offset) { i, set in
                        HStack {
                            Text("\(i + 1). \(set.stroke)")
                                .font(.body)
                            Spacer()
                            Text("\(set.repCount)x\(set.distancePerRep)m")
                                .font(.caption)
                                .foregroundColor(.secondary)
                        }
                    }
                }

                Section {
                    Button {
                        workoutManager.startWorkout()
                    } label: {
                        HStack {
                            Spacer()
                            Image(systemName: "play.fill")
                            Text("Start")
                                .font(.headline)
                            Spacer()
                        }
                    }
                    .buttonStyle(.borderedProminent)
                    .tint(.cyan)

                    Button("Back") {
                        workoutManager.selectedWorkout = nil
                    }
                    .font(.caption)
                    .foregroundColor(.secondary)
                    .frame(maxWidth: .infinity)
                }
            }
        }
        .listStyle(.automatic)
    }
}