ProductForm.swift

import SwiftUI
import Northwind

/**
 * A SwiftUI Form to edit the product columns.
 */
struct ProductForm: View {
  
  @Binding var product : Product
    
  var body: some View {
    Section("Product Information") {
      
      TextField("Product Name", text: $product.productName)
        .help("The name of the product, choose wisely.")
      
      TextField("Price per Unit", value: $product.unitPrice,
                format: .currency(code: "USD"))
        .help("The price of a single unit, in USD.")
      
      TextField("Quantity per Unit", value: $product.quantityPerUnit,
                formatter: .emptyIsNull)
        .help("Describe the contents of a unit, e.g. '10 boxes x 20 bags'.")
    }
    
    Section("Stock") {
      
      TextField("Units in Stock", value: $product.unitsInStock,
                format: .number)
        .help("The number of units we have in stock.")
      
      TextField("Units on Order", value: $product.unitsOnOrder,
                format: .number)
        .help("The number of units we have ordered.")
      
      TextField("Reorder Level", value: $product.reorderLevel,
                format: .number)
      
      // Northwind just uses a string for this, should be made a BOOL
      // column in the database.
      Toggle("Discontinued", isOn: Binding(
        get: { product.discontinued != "0" },
        set: { product.discontinued = $0 ? "1" : "0" }
      ))
    }
  }
}