import SwiftUI

struct Exercise: Identifiable { let id = UUID(); let name: String; let sets: String; let icon: String; var done = false }

struct WorkoutView: View {
    @State private var exercises: [Exercise] = [
        .init(name: "Barbell squat", sets: "4 × 8", icon: "figure.strengthtraining.traditional"),
        .init(name: "Bench press", sets: "4 × 10", icon: "dumbbell.fill"),
        .init(name: "Deadlift", sets: "3 × 6", icon: "figure.strengthtraining.functional"),
        .init(name: "Pull-ups", sets: "3 × 12", icon: "figure.climbing"),
        .init(name: "Plank", sets: "3 × 60s", icon: "figure.core.training")
    ]
    private var done: Int { exercises.filter(\.done).count }

    var body: some View {
        ZStack {
            Color(red: 0.05, green: 0.03, blue: 0.04).ignoresSafeArea()
            ScrollView {
                VStack(alignment: .leading, spacing: 16) {
                    Text("PUSH DAY · 48 MIN").font(.caption).bold().foregroundColor(Color(red: 0.96, green: 0.25, blue: 0.37))
                    Text("Strength A").font(.system(size: 34, weight: .heavy)).foregroundColor(.white)
                    HStack {
                        stat("\(done)/\(exercises.count)", "exercises")
                        stat("1,240", "kg lifted")
                        stat("320", "kcal")
                    }
                    .padding(18).background(Color(red: 0.10, green: 0.05, blue: 0.07)).cornerRadius(18)

                    ForEach($exercises) { $ex in
                        Button { ex.done.toggle() } label: {
                            HStack(spacing: 14) {
                                Image(systemName: ex.icon).font(.title2).foregroundColor(.white).frame(width: 30)
                                VStack(alignment: .leading, spacing: 3) {
                                    Text(ex.name).fontWeight(.semibold).foregroundColor(.white)
                                    Text(ex.sets).font(.footnote).foregroundColor(.gray)
                                }
                                Spacer()
                                Image(systemName: ex.done ? "checkmark.circle.fill" : "circle")
                                    .foregroundColor(ex.done ? Color(red: 0.96, green: 0.25, blue: 0.37) : .gray).font(.title2)
                            }
                            .padding(16).background(Color.white.opacity(0.04)).cornerRadius(16)
                        }
                    }
                }
                .padding(22)
            }
        }
    }

    private func stat(_ value: String, _ label: String) -> some View {
        VStack(spacing: 3) {
            Text(value).font(.title3).bold().foregroundColor(.white)
            Text(label).font(.caption).foregroundColor(.gray)
        }.frame(maxWidth: .infinity)
    }
}

#Preview { WorkoutView() }