How to Build a Sobriety Counter App in SwiftUI

import SwiftData
import Foundation

@Model
final class SobrietyRecord {
    var startDate: Date
    var substanceName: String
    var notes: String

    init(startDate: Date, substanceName: String = "Alcohol", notes: String = "") {
        self.startDate = startDate
        self.substanceName = substanceName
        self.notes = notes
    }

    var daysSober: Int {
        Calendar.current.dateComponents([.day], from: startDate, to: .now).day ?? 0
    }

    var nextMilestone: Int {
        let milestones = [1, 7, 14, 30, 60, 90, 180, 365, 730]
        return milestones.first { $0 > daysSober } ?? daysSober + 365
    }
}

struct CounterView: View {
    @Query private var records: [SobrietyRecord]
    @State private var showingAddSheet = false

    var body: some View {
        NavigationStack {
            Group {
                if let record = records.first {
                    VStack(spacing: 28) {
                        DaysCircleView(days: record.daysSober)
                        Text(record.substanceName)
                            .font(.headline).foregroundStyle(.secondary)
                        MilestonesRowView(daysSober: record.daysSober)
                    }.padding()
                } else {
                    ContentUnavailableView("Start Your Journey",
                        systemImage: "star.circle",
                        description: Text("Tap + to log your sobriety start date."))
                }
            }
            .navigationTitle("Sobriety Counter")
            .toolbar {
                ToolbarItem(placement: .primaryAction) {
                    Button("Add", systemImage: "plus") { showingAddSheet = true }
                }
            }
            .sheet(isPresented: $showingAddSheet) { AddRecordSheet() }
        }
    }
}

struct DaysCircleView: View {
    let days: Int
    @State private var animatedDays = 0

    var body: some View {
        ZStack {
            Circle()
                .stroke(Color.accentColor.opacity(0.15), lineWidth: 14)
                .frame(width: 220, height: 220)
            Circle()
                .trim(from: 0, to: progress)
                .stroke(Color.accentColor,
                        style: StrokeStyle(lineWidth: 14, lineCap: .round))
                .frame(width: 220, height: 220)
                .rotationEffect(.degrees(-90))
                .animation(.easeInOut(duration: 1.2), value: progress)
            VStack(spacing: 4) {
                Text("\(animatedDays)")
                    .font(.system(size: 64, weight: .bold, design: .rounded))
                    .contentTransition(.numericText())
                Text("days sober").font(.subheadline).foregroundStyle(.secondary)
            }
        }
        .onAppear { withAnimation(.easeOut(duration: 0.9)) { animatedDays = days } }
    }

    private var progress: CGFloat { min(CGFloat(days) / 90.0, 1.0) }
}

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