ShopQuick - Priorities Rule 3 Final

rule_final.swift

class PrioritiesManager : ProductManager {
    
    static let sharedInstance = PrioritiesManager()
    
    var productsInThisTrip : [Product]?
    
    func addProduct(product: Product) {
        
        let newProduct = Product(name: product.name, qty: 0)
        
        // if the product exists
        if self.doesProductExist(newProduct.name) {
            
            // Rule #3
            productsInThisTrip?.forEach({ (p: Product) -> () in
                // remove the last product purchased so it can be moved
                let lastProductPriority = self.findIndexForProductName(p.name)
                self.removeProductWithName(p.name)
                
                // insert the last product purchased directly above the current product
                if let existingIndex = self.findIndexForProductName(newProduct.name) {
                    // only move products UP the priority list
                    self.insertProduct(p, atIndex: min(existingIndex, lastProductPriority!))
                }
            })
            // Rule #2 - do nothing
        }
        else {
            // if there is a last item purchased
            if let lastProduct = productsInThisTrip?.last {
                if let lastProductIndex = self.findIndexForProductName(lastProduct.name) {
                    // add the new product right after the last product purchased
                    self.insertProduct(newProduct, atIndex: lastProductIndex + 1) // Rule #1
                }
            }
            else {
                // just add the product to the end of the list
                products.append(newProduct) // Rule #0
            }
        }
        
        productsInThisTrip?.append(newProduct)
        
        self.saveProductsToDefaults()
    
    }
    
}