workouts/Workouts/Schema/WorkoutsContainer.swift

import Foundation
import SwiftData

final class WorkoutsContainer {
    static let logger = AppLogger(subsystem: "Workouts", category: "WorkoutsContainer")
    
    static func create(shouldCreateDefaults: inout Bool) -> ModelContainer {
        let schema = Schema(versionedSchema: SchemaV1.self)
        let container = try! ModelContainer(for: schema, migrationPlan: WorkoutsMigrationPlan.self)
        
        let context = ModelContext(container)
        let descriptor = FetchDescriptor<Workout>()
        let results = try! context.fetch(descriptor)
        
        if results.isEmpty {
            shouldCreateDefaults = true
        }
        
        return container
    }
    
    @MainActor
    static var preview: ModelContainer {
        let configuration = ModelConfiguration(isStoredInMemoryOnly: true)
        
        do {
            let schema = Schema(SchemaV1.models)
            let container = try ModelContainer(for: schema, configurations: configuration)
            let context = ModelContext(container)
            
            // Create default data for previews
            InitialData.create(modelContext: context)
            
            return container
        } catch {
            fatalError("Failed to create preview ModelContainer: \(error.localizedDescription)")
        }
    }
}