Merge pull request mouredev#2465 from blackriper/main

Reto#12-swift

Author: Roswell468

Roadmap/12 - JSON Y XML/swift/blackriper.swift

@@ -0,0 +1,290 @@
+import Foundation
+import XMLCoder
+
+/*
+ Al proceso de convertir un objeto swift a un formato json o Xml 
+ se le conoce como serialización.
+ 
+ anteriormente se usaba la opcion JSONSerialization.dataWithJSONObject para serializar un objeto swift
+ pero desde swift 4.0  se creo  un protocolo Codable para serializar un objeto swift.
+
+ Codable es una composición de dos protocolos:  Encodable y Decodable
+
+ Encondable: Permite serializar un objeto swift a un formato json o Xml
+ Decodable: Permite deserializar un objeto json o Xml a un objeto swift
+
+ codable por defecto no soporta xml por lo cual hay que agregar una libreria para ello 
+ https://github.com/CoreOffice/XMLCoder
+
+ */
+ struct Person:Codable{
+     let name:String
+     let age:Int
+     let birthDate:String
+     let programmingLanguage:[String]
+    }
+
+
+func exampleWorkingWithJson(){
+   let fileManager=FileManager.default
+   let encoder=JSONEncoder()
+   encoder.outputFormatting = .prettyPrinted
+   
+   // crear fichero
+   let person=Person(name:"Rodolfo",age: 29,birthDate: "20/05/1994",programmingLanguage: ["swift","kotlin","go","python","typescript","java"])
+   guard let encoded = try? encoder.encode(person)else{
+        print("error to encode ")
+        return 
+    }
+   fileManager.createFile(atPath: "/home/blackriper/Descargas/person.json", contents:encoded, attributes: nil)
+
+   // leer fichero
+   if let jsonData=fileManager.contents(atPath: "/home/blackriper/Descargas/person.json"){
+        guard let decoded = try? JSONDecoder().decode(Person.self, from: jsonData)else{
+                print("error to decode")
+                return
+            }
+        let gretting="""
+        Hello my name is \(decoded.name) and I am \(decoded.age) years old.
+        I was born on \(decoded.birthDate) and 
+        I am learning \(decoded.programmingLanguage)
+        """
+        print(gretting)
+    }
+    
+    // borrar fichero
+    do{
+      try fileManager.removeItem(atPath: "/home/blackriper/Descargas/person.json")
+    }catch{
+        print("error to delete")
+    } 
+
+}
+
+exampleWorkingWithJson()
+
+func exampleWorkingWithXml(){
+    let fileManager=FileManager.default
+    let person=Person(name:"Rodolfo",age: 29,birthDate: "20/05/1994",programmingLanguage: ["swift","kotlin","go","python","typescript","java"])
+
+    // crear fichero
+    if let xmlDoc = try? XMLEncoder().encode(person,withRootKey: "person") {
+      fileManager.createFile(atPath: "/home/blackriper/Descargas/person.xml", contents:xmlDoc, attributes: nil)
+    }
+
+    // leer fichero 
+    if let xmlData=fileManager.contents(atPath: "/home/blackriper/Descargas/person.xml"){
+        guard let decoded = try? XMLDecoder().decode(Person.self, from: xmlData)else{
+                print("error to decode")
+                return 
+        }
+        let gretting="""
+        Hello my name is \(decoded.name) and I am \(decoded.age) years old.
+        I was born on \(decoded.birthDate) and 
+        I am learning \(decoded.programmingLanguage)
+        """
+        print(gretting)
+
+    }
+
+    // borrar fichero
+    do{
+      try fileManager.removeItem(atPath: "/home/blackriper/Descargas/person.xml")
+    }catch{
+        print("error to delete")
+    } 
+ }
+
+exampleWorkingWithXml()
+
+// ejercicio extra 
+
+ struct Product:Codable {
+    var name: String
+    var cantity: Int
+    var price: Int
+}
+
+ enum Formats {
+    case xml
+    case json
+ }
+
+struct FileOperations{
+   let path: String 
+   private let fileManager = FileManager.default   
+    
+
+    func createFile(_ contents: Data?) {
+        fileManager.createFile(atPath:self.path,contents: contents)
+    }
+
+    func readFile(format: Formats) {
+        guard let data = fileManager.contents(atPath: self.path) else {
+            print("File not found")
+            return
+        }
+       switch format{
+        case .xml:
+            if let xmlDoc = try? XMLDecoder().decode([Product].self, from: data) {
+              xmlDoc.forEach{ product in
+                print("\(product.name)      |    \(product.cantity)       |     \(product.price)  |       \(product.price*product.cantity)")
+              }
+
+                }
+            
+        case .json:
+            if let jsonData = try? JSONDecoder().decode([Product].self, from: data) {
+              jsonData.forEach{ product in
+                print("\(product.name)      |    \(product.cantity)       |     \(product.price)  |       \(product.price*product.cantity)")
+            }
+        }
+       }  
+    }
+   
+    func deleteFile() {
+        do {
+            try fileManager.removeItem(atPath: self.path)
+        }catch let error{
+            print("Error deleting file: \(error)")
+       }
+    }
+}
+
+
+class Cart { 
+    private var products: [Product] = []
+    let fileManager:FileOperations
+    let format:Formats
+
+    init(src:String,fmt:Formats) {
+        self.fileManager = FileOperations(path: src)
+        self.format = fmt
+    }
+
+    func addProduct(product: Product) {
+        products.append(product)
+        self.saveFile()
+    
+    }
+    func removeProduct(name:String) {
+        products.removeAll(where: { $0.name == name.uppercased() })
+        self.saveFile()
+    }
+
+      func updateProduct(name:String){
+       guard var product=products.first(where: { $0.name == name.uppercased() })else {
+          print("Product not found")
+          return
+       }
+       print("update name \(product.name):")
+       let newName=readLine() ?? product.name
+
+       print("update cantity \(product.cantity):")
+       let newCantity = Int(readLine() ?? "\(product.cantity)")
+
+       print("update price \(product.price):")
+       let newPrice = Int(readLine() ?? "\(product.price)")
+
+       product.name=newName.uppercased()
+       product.cantity=newCantity ?? product.cantity
+       product.price=newPrice ?? product.price
+       saveFile()
+    }
+
+    func listProducts(){
+        let header="""
+            Name     | cantity | Price
+          """      
+        print(header)  
+        fileManager.readFile(format: format)   
+     }
+
+    func totalSold(){
+        let total=products.reduce(0) { $0 + $1.price }
+        let header="""
+            Name       |    cantity   |    Price      |   Total Product
+          """      
+       print(header)
+       products.forEach { product in
+        print("\(product.name)      |    \(product.cantity)       |     \(product.price)  |       \(product.price*product.cantity)")
+       }
+       print("Total sold: \(total)")
+    }
+    
+
+    func exitApp(){
+      fileManager.deleteFile()
+    }
+  
+   private func saveFile() {
+       switch format {
+           case .xml:
+           if let xmlDoc = try? XMLEncoder().encode(products,withRootKey: "products") {
+              fileManager.createFile(xmlDoc)
+           }
+           case .json:
+           if let jsonData = try? JSONEncoder().encode(products) {
+              fileManager.createFile(jsonData)
+           }
+       } 
+   }
+}
+            
+
+            
+
+ func marketPlace(format:Formats) {
+   let src = switch format {
+      case .xml:
+         "/home/blackriper/Descargas/products.xml"
+      case .json:
+         "/home/blackriper/Descargas/products.json"   
+    }
+     let cart = Cart(src: src, fmt: format)
+  marketloop:
+     while true {
+        print("1. Add product")
+        print("2. Remove product")
+        print("3. Update product")
+        print("4. List products")
+        print("5. Total sold")
+        print("6. Exit")
+        let option = Int(readLine() ?? "0") ?? 0
+        switch option {
+           case 1:
+              print("Name of product:")
+              let name = readLine() ?? ""
+              print("Cantity:")
+              let cantity = Int(readLine() ?? "0") ?? 0
+              print("Price:")
+              let price = Int(readLine() ?? "0") ?? 0
+              let product=Product(name: name.uppercased(), cantity: cantity, price: price)
+              cart.addProduct(product: product)
+           
+           case 2:
+              print("Name of product:")
+              let name = readLine() ?? ""
+              cart.removeProduct(name: name.uppercased())
+
+           case 3: 
+              print("Name of product:")
+              let name = readLine() ?? ""
+              cart.updateProduct(name: name.uppercased())
+           case 4:
+              cart.listProducts()
+           
+           case 5:
+              cart.totalSold()
+
+           case 6:
+              cart.exitApp()
+              break marketloop
+            
+           default:
+             print("Invalid option")
+        }
+    }    
+ }
+
+ marketPlace(format: Formats.json)