How to Build a Meal Planner App in SwiftUI

import SwiftData
import Foundation

@Model
final class Meal {
    var name: String
    var ingredients: [String]
    var prepTime: Int        // minutes
    var category: String     // "breakfast" | "lunch" | "dinner"
    var notes: String

    init(name: String, category: String = "dinner", prepTime: Int = 30) {
        self.name = name
        self.ingredients = []
        self.prepTime = prepTime
        self.category = category
        self.notes = ""
    }
}

@Model
final class MealEntry {
    var date: Date
    var mealType: String
    @Relationship(deleteRule: .nullify) var meal: Meal?

    init(date: Date, mealType: String) {
        self.date = date
        self.mealType = mealType
    }
}

struct WeeklyPlanView: View {
    @Query(sort: \MealEntry.date) private var entries: [MealEntry]
    @State private var weekOffset = 0

    private var weekDates: [Date] {
        let cal = Calendar.current
        let today = cal.startOfDay(for: Date())
        let wd = cal.component(.weekday, from: today)
        let monday = cal.date(
            byAdding: .day,
            value: -((wd + 5) % 7) + weekOffset * 7,
            to: today
        )!
        return (0..<7).map { cal.date(byAdding: .day, value: $0, to: monday)! }
    }

    var body: some View {
        NavigationStack {
            ScrollView {
                VStack(spacing: 2) {
                    WeekHeaderRow(dates: weekDates, offset: $weekOffset)
                    ForEach(["Breakfast", "Lunch", "Dinner"], id: \.self) { type in
                        MealTypeRow(dates: weekDates, mealType: type, entries: entries)
                    }
                }.padding(.horizontal)
            }
            .navigationTitle("Meal Planner")
        }
    }
}

struct MealPickerSheet: View {
    let date: Date
    let mealType: String
    @Query private var meals: [Meal]
    @Environment(\.modelContext) private var context
    @Environment(\.dismiss) private var dismiss

    var body: some View {
        NavigationStack {
            List(meals) { meal in
                Button {
                    let cal = Calendar.current
                    let entry = MealEntry(
                        date: cal.startOfDay(for: date),
                        mealType: mealType
                    )
                    entry.meal = meal
                    context.insert(entry)
                    dismiss()
                } label: {
                    VStack(alignment: .leading, spacing: 2) {
                        Text(meal.name)
                        Text("\(meal.prepTime) min · \(meal.category)")
                            .font(.caption).foregroundStyle(.secondary)
                    }
                }.tint(.primary)
            }
            .navigationTitle("\(mealType) — \(date.formatted(.dateTime.weekday().month().day()))")
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("Cancel") { dismiss() }
                }
            }
        }
    }
}

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